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@ -1,7 +1,7 @@ |
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/* zlib.h -- interface of the 'zlib' general purpose compression library
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/* zlib.h -- interface of the 'zlib' general purpose compression library
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version 1.2.8, April 28th, 2013 |
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version 1.2.11, January 15th, 2017 |
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Copyright (C) 1995-2013 Jean-loup Gailly and Mark Adler |
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Copyright (C) 1995-2017 Jean-loup Gailly and Mark Adler |
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This software is provided 'as-is', without any express or implied |
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This software is provided 'as-is', without any express or implied |
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warranty. In no event will the authors be held liable for any damages |
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warranty. In no event will the authors be held liable for any damages |
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@ -37,11 +37,11 @@ |
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extern "C" { |
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extern "C" { |
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#endif |
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#endif |
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#define ZLIB_VERSION "1.2.8" |
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#define ZLIB_VERSION "1.2.11" |
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#define ZLIB_VERNUM 0x1280 |
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#define ZLIB_VERNUM 0x12b0 |
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#define ZLIB_VER_MAJOR 1 |
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#define ZLIB_VER_MAJOR 1 |
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#define ZLIB_VER_MINOR 2 |
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#define ZLIB_VER_MINOR 2 |
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#define ZLIB_VER_REVISION 8 |
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#define ZLIB_VER_REVISION 11 |
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#define ZLIB_VER_SUBREVISION 0 |
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#define ZLIB_VER_SUBREVISION 0 |
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/*
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/*
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@ -65,7 +65,8 @@ extern "C" { |
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with "gz". The gzip format is different from the zlib format. gzip is a |
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with "gz". The gzip format is different from the zlib format. gzip is a |
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gzip wrapper, documented in RFC 1952, wrapped around a deflate stream. |
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gzip wrapper, documented in RFC 1952, wrapped around a deflate stream. |
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This library can optionally read and write gzip streams in memory as well. |
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This library can optionally read and write gzip and raw deflate streams in |
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memory as well. |
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The zlib format was designed to be compact and fast for use in memory |
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The zlib format was designed to be compact and fast for use in memory |
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and on communications channels. The gzip format was designed for single- |
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and on communications channels. The gzip format was designed for single- |
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@ -74,7 +75,7 @@ extern "C" { |
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The library does not install any signal handler. The decoder checks |
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The library does not install any signal handler. The decoder checks |
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the consistency of the compressed data, so the library should never crash |
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the consistency of the compressed data, so the library should never crash |
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even in case of corrupted input. |
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even in the case of corrupted input. |
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*/ |
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*/ |
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typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size)); |
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typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size)); |
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@ -87,7 +88,7 @@ typedef struct z_stream_s { |
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uInt avail_in; /* number of bytes available at next_in */ |
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uInt avail_in; /* number of bytes available at next_in */ |
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uLong total_in; /* total number of input bytes read so far */ |
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uLong total_in; /* total number of input bytes read so far */ |
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Bytef *next_out; /* next output byte should be put there */ |
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Bytef *next_out; /* next output byte will go here */ |
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uInt avail_out; /* remaining free space at next_out */ |
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uInt avail_out; /* remaining free space at next_out */ |
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uLong total_out; /* total number of bytes output so far */ |
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uLong total_out; /* total number of bytes output so far */ |
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@ -98,8 +99,9 @@ typedef struct z_stream_s { |
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free_func zfree; /* used to free the internal state */ |
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free_func zfree; /* used to free the internal state */ |
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voidpf opaque; /* private data object passed to zalloc and zfree */ |
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voidpf opaque; /* private data object passed to zalloc and zfree */ |
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int data_type; /* best guess about the data type: binary or text */ |
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int data_type; /* best guess about the data type: binary or text
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uLong adler; /* adler32 value of the uncompressed data */ |
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for deflate, or the decoding state for inflate */ |
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uLong adler; /* Adler-32 or CRC-32 value of the uncompressed data */ |
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uLong reserved; /* reserved for future use */ |
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uLong reserved; /* reserved for future use */ |
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} z_stream; |
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} z_stream; |
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@ -142,7 +144,9 @@ typedef gz_header FAR *gz_headerp; |
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zalloc must return Z_NULL if there is not enough memory for the object. |
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zalloc must return Z_NULL if there is not enough memory for the object. |
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If zlib is used in a multi-threaded application, zalloc and zfree must be |
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If zlib is used in a multi-threaded application, zalloc and zfree must be |
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thread safe. |
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thread safe. In that case, zlib is thread-safe. When zalloc and zfree are |
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Z_NULL on entry to the initialization function, they are set to internal |
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routines that use the standard library functions malloc() and free(). |
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On 16-bit systems, the functions zalloc and zfree must be able to allocate |
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On 16-bit systems, the functions zalloc and zfree must be able to allocate |
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exactly 65536 bytes, but will not be required to allocate more than this if |
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exactly 65536 bytes, but will not be required to allocate more than this if |
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@ -155,7 +159,7 @@ typedef gz_header FAR *gz_headerp; |
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The fields total_in and total_out can be used for statistics or progress |
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The fields total_in and total_out can be used for statistics or progress |
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reports. After compression, total_in holds the total size of the |
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reports. After compression, total_in holds the total size of the |
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uncompressed data and may be saved for use in the decompressor (particularly |
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uncompressed data and may be saved for use by the decompressor (particularly |
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if the decompressor wants to decompress everything in a single step). |
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if the decompressor wants to decompress everything in a single step). |
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*/ |
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*/ |
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@ -200,7 +204,7 @@ typedef gz_header FAR *gz_headerp; |
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#define Z_TEXT 1 |
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#define Z_TEXT 1 |
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#define Z_ASCII Z_TEXT /* for compatibility with 1.2.2 and earlier */ |
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#define Z_ASCII Z_TEXT /* for compatibility with 1.2.2 and earlier */ |
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#define Z_UNKNOWN 2 |
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#define Z_UNKNOWN 2 |
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/* Possible values of the data_type field (though see inflate()) */ |
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/* Possible values of the data_type field for deflate() */ |
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#define Z_DEFLATED 8 |
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#define Z_DEFLATED 8 |
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/* The deflate compression method (the only one supported in this version) */ |
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/* The deflate compression method (the only one supported in this version) */ |
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@ -258,11 +262,11 @@ ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush)); |
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enough room in the output buffer), next_in and avail_in are updated and |
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enough room in the output buffer), next_in and avail_in are updated and |
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processing will resume at this point for the next call of deflate(). |
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processing will resume at this point for the next call of deflate(). |
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- Provide more output starting at next_out and update next_out and avail_out |
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- Generate more output starting at next_out and update next_out and avail_out |
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accordingly. This action is forced if the parameter flush is non zero. |
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accordingly. This action is forced if the parameter flush is non zero. |
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Forcing flush frequently degrades the compression ratio, so this parameter |
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Forcing flush frequently degrades the compression ratio, so this parameter |
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should be set only when necessary (in interactive applications). Some |
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should be set only when necessary. Some output may be provided even if |
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output may be provided even if flush is not set. |
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flush is zero. |
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Before the call of deflate(), the application should ensure that at least |
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Before the call of deflate(), the application should ensure that at least |
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one of the actions is possible, by providing more input and/or consuming more |
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one of the actions is possible, by providing more input and/or consuming more |
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@ -271,7 +275,9 @@ ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush)); |
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output when it wants, for example when the output buffer is full (avail_out |
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output when it wants, for example when the output buffer is full (avail_out |
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== 0), or after each call of deflate(). If deflate returns Z_OK and with |
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== 0), or after each call of deflate(). If deflate returns Z_OK and with |
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zero avail_out, it must be called again after making room in the output |
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zero avail_out, it must be called again after making room in the output |
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buffer because there might be more output pending. |
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buffer because there might be more output pending. See deflatePending(), |
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which can be used if desired to determine whether or not there is more ouput |
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in that case. |
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Normally the parameter flush is set to Z_NO_FLUSH, which allows deflate to |
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Normally the parameter flush is set to Z_NO_FLUSH, which allows deflate to |
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decide how much data to accumulate before producing output, in order to |
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decide how much data to accumulate before producing output, in order to |
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@ -292,8 +298,8 @@ ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush)); |
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input data so far will be available to the decompressor, as for Z_SYNC_FLUSH. |
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input data so far will be available to the decompressor, as for Z_SYNC_FLUSH. |
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This completes the current deflate block and follows it with an empty fixed |
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This completes the current deflate block and follows it with an empty fixed |
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codes block that is 10 bits long. This assures that enough bytes are output |
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codes block that is 10 bits long. This assures that enough bytes are output |
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in order for the decompressor to finish the block before the empty fixed code |
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in order for the decompressor to finish the block before the empty fixed |
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block. |
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codes block. |
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If flush is set to Z_BLOCK, a deflate block is completed and emitted, as |
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If flush is set to Z_BLOCK, a deflate block is completed and emitted, as |
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for Z_SYNC_FLUSH, but the output is not aligned on a byte boundary, and up to |
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for Z_SYNC_FLUSH, but the output is not aligned on a byte boundary, and up to |
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@ -319,34 +325,38 @@ ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush)); |
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If the parameter flush is set to Z_FINISH, pending input is processed, |
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If the parameter flush is set to Z_FINISH, pending input is processed, |
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pending output is flushed and deflate returns with Z_STREAM_END if there was |
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pending output is flushed and deflate returns with Z_STREAM_END if there was |
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enough output space; if deflate returns with Z_OK, this function must be |
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enough output space. If deflate returns with Z_OK or Z_BUF_ERROR, this |
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called again with Z_FINISH and more output space (updated avail_out) but no |
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function must be called again with Z_FINISH and more output space (updated |
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more input data, until it returns with Z_STREAM_END or an error. After |
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avail_out) but no more input data, until it returns with Z_STREAM_END or an |
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deflate has returned Z_STREAM_END, the only possible operations on the stream |
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error. After deflate has returned Z_STREAM_END, the only possible operations |
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are deflateReset or deflateEnd. |
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on the stream are deflateReset or deflateEnd. |
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Z_FINISH can be used immediately after deflateInit if all the compression |
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Z_FINISH can be used in the first deflate call after deflateInit if all the |
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is to be done in a single step. In this case, avail_out must be at least the |
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compression is to be done in a single step. In order to complete in one |
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value returned by deflateBound (see below). Then deflate is guaranteed to |
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call, avail_out must be at least the value returned by deflateBound (see |
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return Z_STREAM_END. If not enough output space is provided, deflate will |
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below). Then deflate is guaranteed to return Z_STREAM_END. If not enough |
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not return Z_STREAM_END, and it must be called again as described above. |
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output space is provided, deflate will not return Z_STREAM_END, and it must |
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be called again as described above. |
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deflate() sets strm->adler to the adler32 checksum of all input read |
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so far (that is, total_in bytes). |
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deflate() sets strm->adler to the Adler-32 checksum of all input read |
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so far (that is, total_in bytes). If a gzip stream is being generated, then |
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strm->adler will be the CRC-32 checksum of the input read so far. (See |
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deflateInit2 below.) |
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deflate() may update strm->data_type if it can make a good guess about |
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deflate() may update strm->data_type if it can make a good guess about |
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the input data type (Z_BINARY or Z_TEXT). In doubt, the data is considered |
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the input data type (Z_BINARY or Z_TEXT). If in doubt, the data is |
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binary. This field is only for information purposes and does not affect the |
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considered binary. This field is only for information purposes and does not |
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compression algorithm in any manner. |
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affect the compression algorithm in any manner. |
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deflate() returns Z_OK if some progress has been made (more input |
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deflate() returns Z_OK if some progress has been made (more input |
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processed or more output produced), Z_STREAM_END if all input has been |
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processed or more output produced), Z_STREAM_END if all input has been |
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consumed and all output has been produced (only when flush is set to |
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consumed and all output has been produced (only when flush is set to |
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Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example |
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Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example |
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if next_in or next_out was Z_NULL), Z_BUF_ERROR if no progress is possible |
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if next_in or next_out was Z_NULL or the state was inadvertently written over |
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(for example avail_in or avail_out was zero). Note that Z_BUF_ERROR is not |
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by the application), or Z_BUF_ERROR if no progress is possible (for example |
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fatal, and deflate() can be called again with more input and more output |
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avail_in or avail_out was zero). Note that Z_BUF_ERROR is not fatal, and |
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space to continue compressing. |
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deflate() can be called again with more input and more output space to |
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continue compressing. |
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*/ |
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*/ |
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@ -369,23 +379,21 @@ ZEXTERN int ZEXPORT inflateInit OF((z_streamp strm)); |
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Initializes the internal stream state for decompression. The fields |
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Initializes the internal stream state for decompression. The fields |
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next_in, avail_in, zalloc, zfree and opaque must be initialized before by |
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next_in, avail_in, zalloc, zfree and opaque must be initialized before by |
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the caller. If next_in is not Z_NULL and avail_in is large enough (the |
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the caller. In the current version of inflate, the provided input is not |
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exact value depends on the compression method), inflateInit determines the |
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read or consumed. The allocation of a sliding window will be deferred to |
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compression method from the zlib header and allocates all data structures |
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the first call of inflate (if the decompression does not complete on the |
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accordingly; otherwise the allocation will be deferred to the first call of |
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first call). If zalloc and zfree are set to Z_NULL, inflateInit updates |
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inflate. If zalloc and zfree are set to Z_NULL, inflateInit updates them to |
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them to use default allocation functions. |
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use default allocation functions. |
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inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough |
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inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough |
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memory, Z_VERSION_ERROR if the zlib library version is incompatible with the |
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memory, Z_VERSION_ERROR if the zlib library version is incompatible with the |
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version assumed by the caller, or Z_STREAM_ERROR if the parameters are |
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version assumed by the caller, or Z_STREAM_ERROR if the parameters are |
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invalid, such as a null pointer to the structure. msg is set to null if |
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invalid, such as a null pointer to the structure. msg is set to null if |
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there is no error message. inflateInit does not perform any decompression |
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there is no error message. inflateInit does not perform any decompression. |
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apart from possibly reading the zlib header if present: actual decompression |
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Actual decompression will be done by inflate(). So next_in, and avail_in, |
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will be done by inflate(). (So next_in and avail_in may be modified, but |
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next_out, and avail_out are unused and unchanged. The current |
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next_out and avail_out are unused and unchanged.) The current implementation |
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implementation of inflateInit() does not process any header information -- |
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of inflateInit() does not process any header information -- that is deferred |
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that is deferred until inflate() is called. |
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until inflate() is called. |
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*/ |
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*/ |
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@ -401,17 +409,20 @@ ZEXTERN int ZEXPORT inflate OF((z_streamp strm, int flush)); |
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- Decompress more input starting at next_in and update next_in and avail_in |
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- Decompress more input starting at next_in and update next_in and avail_in |
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accordingly. If not all input can be processed (because there is not |
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accordingly. If not all input can be processed (because there is not |
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enough room in the output buffer), next_in is updated and processing will |
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enough room in the output buffer), then next_in and avail_in are updated |
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resume at this point for the next call of inflate(). |
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accordingly, and processing will resume at this point for the next call of |
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inflate(). |
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- Provide more output starting at next_out and update next_out and avail_out |
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- Generate more output starting at next_out and update next_out and avail_out |
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accordingly. inflate() provides as much output as possible, until there is |
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accordingly. inflate() provides as much output as possible, until there is |
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no more input data or no more space in the output buffer (see below about |
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no more input data or no more space in the output buffer (see below about |
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the flush parameter). |
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the flush parameter). |
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Before the call of inflate(), the application should ensure that at least |
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Before the call of inflate(), the application should ensure that at least |
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one of the actions is possible, by providing more input and/or consuming more |
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one of the actions is possible, by providing more input and/or consuming more |
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output, and updating the next_* and avail_* values accordingly. The |
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output, and updating the next_* and avail_* values accordingly. If the |
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caller of inflate() does not provide both available input and available |
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output space, it is possible that there will be no progress made. The |
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application can consume the uncompressed output when it wants, for example |
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application can consume the uncompressed output when it wants, for example |
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when the output buffer is full (avail_out == 0), or after each call of |
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when the output buffer is full (avail_out == 0), or after each call of |
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inflate(). If inflate returns Z_OK and with zero avail_out, it must be |
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inflate(). If inflate returns Z_OK and with zero avail_out, it must be |
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@ -428,7 +439,7 @@ ZEXTERN int ZEXPORT inflate OF((z_streamp strm, int flush)); |
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gets to the end of that block, or when it runs out of data. |
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gets to the end of that block, or when it runs out of data. |
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The Z_BLOCK option assists in appending to or combining deflate streams. |
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The Z_BLOCK option assists in appending to or combining deflate streams. |
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Also to assist in this, on return inflate() will set strm->data_type to the |
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To assist in this, on return inflate() always sets strm->data_type to the |
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number of unused bits in the last byte taken from strm->next_in, plus 64 if |
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number of unused bits in the last byte taken from strm->next_in, plus 64 if |
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inflate() is currently decoding the last block in the deflate stream, plus |
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inflate() is currently decoding the last block in the deflate stream, plus |
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128 if inflate() returned immediately after decoding an end-of-block code or |
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128 if inflate() returned immediately after decoding an end-of-block code or |
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@ -454,7 +465,7 @@ ZEXTERN int ZEXPORT inflate OF((z_streamp strm, int flush)); |
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this case all pending input is processed and all pending output is flushed; |
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this case all pending input is processed and all pending output is flushed; |
|
|
avail_out must be large enough to hold all of the uncompressed data for the |
|
|
avail_out must be large enough to hold all of the uncompressed data for the |
|
|
operation to complete. (The size of the uncompressed data may have been |
|
|
operation to complete. (The size of the uncompressed data may have been |
|
|
saved by the compressor for this purpose.) The use of Z_FINISH is not |
|
|
saved by the compressor for this purpose.) The use of Z_FINISH is not |
|
|
required to perform an inflation in one step. However it may be used to |
|
|
required to perform an inflation in one step. However it may be used to |
|
|
inform inflate that a faster approach can be used for the single inflate() |
|
|
inform inflate that a faster approach can be used for the single inflate() |
|
|
call. Z_FINISH also informs inflate to not maintain a sliding window if the |
|
|
call. Z_FINISH also informs inflate to not maintain a sliding window if the |
|
|
@ -476,32 +487,33 @@ ZEXTERN int ZEXPORT inflate OF((z_streamp strm, int flush)); |
|
|
chosen by the compressor and returns Z_NEED_DICT; otherwise it sets |
|
|
chosen by the compressor and returns Z_NEED_DICT; otherwise it sets |
|
|
strm->adler to the Adler-32 checksum of all output produced so far (that is, |
|
|
strm->adler to the Adler-32 checksum of all output produced so far (that is, |
|
|
total_out bytes) and returns Z_OK, Z_STREAM_END or an error code as described |
|
|
total_out bytes) and returns Z_OK, Z_STREAM_END or an error code as described |
|
|
below. At the end of the stream, inflate() checks that its computed adler32 |
|
|
below. At the end of the stream, inflate() checks that its computed Adler-32 |
|
|
checksum is equal to that saved by the compressor and returns Z_STREAM_END |
|
|
checksum is equal to that saved by the compressor and returns Z_STREAM_END |
|
|
only if the checksum is correct. |
|
|
only if the checksum is correct. |
|
|
|
|
|
|
|
|
inflate() can decompress and check either zlib-wrapped or gzip-wrapped |
|
|
inflate() can decompress and check either zlib-wrapped or gzip-wrapped |
|
|
deflate data. The header type is detected automatically, if requested when |
|
|
deflate data. The header type is detected automatically, if requested when |
|
|
initializing with inflateInit2(). Any information contained in the gzip |
|
|
initializing with inflateInit2(). Any information contained in the gzip |
|
|
header is not retained, so applications that need that information should |
|
|
header is not retained unless inflateGetHeader() is used. When processing |
|
|
instead use raw inflate, see inflateInit2() below, or inflateBack() and |
|
|
|
|
|
perform their own processing of the gzip header and trailer. When processing |
|
|
|
|
|
gzip-wrapped deflate data, strm->adler32 is set to the CRC-32 of the output |
|
|
gzip-wrapped deflate data, strm->adler32 is set to the CRC-32 of the output |
|
|
producted so far. The CRC-32 is checked against the gzip trailer. |
|
|
produced so far. The CRC-32 is checked against the gzip trailer, as is the |
|
|
|
|
|
uncompressed length, modulo 2^32. |
|
|
|
|
|
|
|
|
inflate() returns Z_OK if some progress has been made (more input processed |
|
|
inflate() returns Z_OK if some progress has been made (more input processed |
|
|
or more output produced), Z_STREAM_END if the end of the compressed data has |
|
|
or more output produced), Z_STREAM_END if the end of the compressed data has |
|
|
been reached and all uncompressed output has been produced, Z_NEED_DICT if a |
|
|
been reached and all uncompressed output has been produced, Z_NEED_DICT if a |
|
|
preset dictionary is needed at this point, Z_DATA_ERROR if the input data was |
|
|
preset dictionary is needed at this point, Z_DATA_ERROR if the input data was |
|
|
corrupted (input stream not conforming to the zlib format or incorrect check |
|
|
corrupted (input stream not conforming to the zlib format or incorrect check |
|
|
value), Z_STREAM_ERROR if the stream structure was inconsistent (for example |
|
|
value, in which case strm->msg points to a string with a more specific |
|
|
next_in or next_out was Z_NULL), Z_MEM_ERROR if there was not enough memory, |
|
|
error), Z_STREAM_ERROR if the stream structure was inconsistent (for example |
|
|
Z_BUF_ERROR if no progress is possible or if there was not enough room in the |
|
|
next_in or next_out was Z_NULL, or the state was inadvertently written over |
|
|
output buffer when Z_FINISH is used. Note that Z_BUF_ERROR is not fatal, and |
|
|
by the application), Z_MEM_ERROR if there was not enough memory, Z_BUF_ERROR |
|
|
|
|
|
if no progress was possible or if there was not enough room in the output |
|
|
|
|
|
buffer when Z_FINISH is used. Note that Z_BUF_ERROR is not fatal, and |
|
|
inflate() can be called again with more input and more output space to |
|
|
inflate() can be called again with more input and more output space to |
|
|
continue decompressing. If Z_DATA_ERROR is returned, the application may |
|
|
continue decompressing. If Z_DATA_ERROR is returned, the application may |
|
|
then call inflateSync() to look for a good compression block if a partial |
|
|
then call inflateSync() to look for a good compression block if a partial |
|
|
recovery of the data is desired. |
|
|
recovery of the data is to be attempted. |
|
|
*/ |
|
|
*/ |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
@ -511,9 +523,8 @@ ZEXTERN int ZEXPORT inflateEnd OF((z_streamp strm)); |
|
|
This function discards any unprocessed input and does not flush any pending |
|
|
This function discards any unprocessed input and does not flush any pending |
|
|
output. |
|
|
output. |
|
|
|
|
|
|
|
|
inflateEnd returns Z_OK if success, Z_STREAM_ERROR if the stream state |
|
|
inflateEnd returns Z_OK if success, or Z_STREAM_ERROR if the stream state |
|
|
was inconsistent. In the error case, msg may be set but then points to a |
|
|
was inconsistent. |
|
|
static string (which must not be deallocated). |
|
|
|
|
|
*/ |
|
|
*/ |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
@ -544,16 +555,29 @@ ZEXTERN int ZEXPORT deflateInit2 OF((z_streamp strm, |
|
|
compression at the expense of memory usage. The default value is 15 if |
|
|
compression at the expense of memory usage. The default value is 15 if |
|
|
deflateInit is used instead. |
|
|
deflateInit is used instead. |
|
|
|
|
|
|
|
|
|
|
|
For the current implementation of deflate(), a windowBits value of 8 (a |
|
|
|
|
|
window size of 256 bytes) is not supported. As a result, a request for 8 |
|
|
|
|
|
will result in 9 (a 512-byte window). In that case, providing 8 to |
|
|
|
|
|
inflateInit2() will result in an error when the zlib header with 9 is |
|
|
|
|
|
checked against the initialization of inflate(). The remedy is to not use 8 |
|
|
|
|
|
with deflateInit2() with this initialization, or at least in that case use 9 |
|
|
|
|
|
with inflateInit2(). |
|
|
|
|
|
|
|
|
windowBits can also be -8..-15 for raw deflate. In this case, -windowBits |
|
|
windowBits can also be -8..-15 for raw deflate. In this case, -windowBits |
|
|
determines the window size. deflate() will then generate raw deflate data |
|
|
determines the window size. deflate() will then generate raw deflate data |
|
|
with no zlib header or trailer, and will not compute an adler32 check value. |
|
|
with no zlib header or trailer, and will not compute a check value. |
|
|
|
|
|
|
|
|
windowBits can also be greater than 15 for optional gzip encoding. Add |
|
|
windowBits can also be greater than 15 for optional gzip encoding. Add |
|
|
16 to windowBits to write a simple gzip header and trailer around the |
|
|
16 to windowBits to write a simple gzip header and trailer around the |
|
|
compressed data instead of a zlib wrapper. The gzip header will have no |
|
|
compressed data instead of a zlib wrapper. The gzip header will have no |
|
|
file name, no extra data, no comment, no modification time (set to zero), no |
|
|
file name, no extra data, no comment, no modification time (set to zero), no |
|
|
header crc, and the operating system will be set to 255 (unknown). If a |
|
|
header crc, and the operating system will be set to the appropriate value, |
|
|
gzip stream is being written, strm->adler is a crc32 instead of an adler32. |
|
|
if the operating system was determined at compile time. If a gzip stream is |
|
|
|
|
|
being written, strm->adler is a CRC-32 instead of an Adler-32. |
|
|
|
|
|
|
|
|
|
|
|
For raw deflate or gzip encoding, a request for a 256-byte window is |
|
|
|
|
|
rejected as invalid, since only the zlib header provides a means of |
|
|
|
|
|
transmitting the window size to the decompressor. |
|
|
|
|
|
|
|
|
The memLevel parameter specifies how much memory should be allocated |
|
|
The memLevel parameter specifies how much memory should be allocated |
|
|
for the internal compression state. memLevel=1 uses minimum memory but is |
|
|
for the internal compression state. memLevel=1 uses minimum memory but is |
|
|
@ -614,12 +638,12 @@ ZEXTERN int ZEXPORT deflateSetDictionary OF((z_streamp strm, |
|
|
addition, the current implementation of deflate will use at most the window |
|
|
addition, the current implementation of deflate will use at most the window |
|
|
size minus 262 bytes of the provided dictionary. |
|
|
size minus 262 bytes of the provided dictionary. |
|
|
|
|
|
|
|
|
Upon return of this function, strm->adler is set to the adler32 value |
|
|
Upon return of this function, strm->adler is set to the Adler-32 value |
|
|
of the dictionary; the decompressor may later use this value to determine |
|
|
of the dictionary; the decompressor may later use this value to determine |
|
|
which dictionary has been used by the compressor. (The adler32 value |
|
|
which dictionary has been used by the compressor. (The Adler-32 value |
|
|
applies to the whole dictionary even if only a subset of the dictionary is |
|
|
applies to the whole dictionary even if only a subset of the dictionary is |
|
|
actually used by the compressor.) If a raw deflate was requested, then the |
|
|
actually used by the compressor.) If a raw deflate was requested, then the |
|
|
adler32 value is not computed and strm->adler is not set. |
|
|
Adler-32 value is not computed and strm->adler is not set. |
|
|
|
|
|
|
|
|
deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a |
|
|
deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a |
|
|
parameter is invalid (e.g. dictionary being Z_NULL) or the stream state is |
|
|
parameter is invalid (e.g. dictionary being Z_NULL) or the stream state is |
|
|
@ -628,6 +652,28 @@ ZEXTERN int ZEXPORT deflateSetDictionary OF((z_streamp strm, |
|
|
not perform any compression: this will be done by deflate(). |
|
|
not perform any compression: this will be done by deflate(). |
|
|
*/ |
|
|
*/ |
|
|
|
|
|
|
|
|
|
|
|
ZEXTERN int ZEXPORT deflateGetDictionary OF((z_streamp strm, |
|
|
|
|
|
Bytef *dictionary, |
|
|
|
|
|
uInt *dictLength)); |
|
|
|
|
|
/*
|
|
|
|
|
|
Returns the sliding dictionary being maintained by deflate. dictLength is |
|
|
|
|
|
set to the number of bytes in the dictionary, and that many bytes are copied |
|
|
|
|
|
to dictionary. dictionary must have enough space, where 32768 bytes is |
|
|
|
|
|
always enough. If deflateGetDictionary() is called with dictionary equal to |
|
|
|
|
|
Z_NULL, then only the dictionary length is returned, and nothing is copied. |
|
|
|
|
|
Similary, if dictLength is Z_NULL, then it is not set. |
|
|
|
|
|
|
|
|
|
|
|
deflateGetDictionary() may return a length less than the window size, even |
|
|
|
|
|
when more than the window size in input has been provided. It may return up |
|
|
|
|
|
to 258 bytes less in that case, due to how zlib's implementation of deflate |
|
|
|
|
|
manages the sliding window and lookahead for matches, where matches can be |
|
|
|
|
|
up to 258 bytes long. If the application needs the last window-size bytes of |
|
|
|
|
|
input, then that would need to be saved by the application outside of zlib. |
|
|
|
|
|
|
|
|
|
|
|
deflateGetDictionary returns Z_OK on success, or Z_STREAM_ERROR if the |
|
|
|
|
|
stream state is inconsistent. |
|
|
|
|
|
*/ |
|
|
|
|
|
|
|
|
ZEXTERN int ZEXPORT deflateCopy OF((z_streamp dest, |
|
|
ZEXTERN int ZEXPORT deflateCopy OF((z_streamp dest, |
|
|
z_streamp source)); |
|
|
z_streamp source)); |
|
|
/*
|
|
|
/*
|
|
|
@ -648,10 +694,10 @@ ZEXTERN int ZEXPORT deflateCopy OF((z_streamp dest, |
|
|
|
|
|
|
|
|
ZEXTERN int ZEXPORT deflateReset OF((z_streamp strm)); |
|
|
ZEXTERN int ZEXPORT deflateReset OF((z_streamp strm)); |
|
|
/*
|
|
|
/*
|
|
|
This function is equivalent to deflateEnd followed by deflateInit, |
|
|
This function is equivalent to deflateEnd followed by deflateInit, but |
|
|
but does not free and reallocate all the internal compression state. The |
|
|
does not free and reallocate the internal compression state. The stream |
|
|
stream will keep the same compression level and any other attributes that |
|
|
will leave the compression level and any other attributes that may have been |
|
|
may have been set by deflateInit2. |
|
|
set unchanged. |
|
|
|
|
|
|
|
|
deflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source |
|
|
deflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source |
|
|
stream state was inconsistent (such as zalloc or state being Z_NULL). |
|
|
stream state was inconsistent (such as zalloc or state being Z_NULL). |
|
|
@ -662,20 +708,36 @@ ZEXTERN int ZEXPORT deflateParams OF((z_streamp strm, |
|
|
int strategy)); |
|
|
int strategy)); |
|
|
/*
|
|
|
/*
|
|
|
Dynamically update the compression level and compression strategy. The |
|
|
Dynamically update the compression level and compression strategy. The |
|
|
interpretation of level and strategy is as in deflateInit2. This can be |
|
|
interpretation of level and strategy is as in deflateInit2(). This can be |
|
|
used to switch between compression and straight copy of the input data, or |
|
|
used to switch between compression and straight copy of the input data, or |
|
|
to switch to a different kind of input data requiring a different strategy. |
|
|
to switch to a different kind of input data requiring a different strategy. |
|
|
If the compression level is changed, the input available so far is |
|
|
If the compression approach (which is a function of the level) or the |
|
|
compressed with the old level (and may be flushed); the new level will take |
|
|
strategy is changed, and if any input has been consumed in a previous |
|
|
effect only at the next call of deflate(). |
|
|
deflate() call, then the input available so far is compressed with the old |
|
|
|
|
|
level and strategy using deflate(strm, Z_BLOCK). There are three approaches |
|
|
Before the call of deflateParams, the stream state must be set as for |
|
|
for the compression levels 0, 1..3, and 4..9 respectively. The new level |
|
|
a call of deflate(), since the currently available input may have to be |
|
|
and strategy will take effect at the next call of deflate(). |
|
|
compressed and flushed. In particular, strm->avail_out must be non-zero. |
|
|
|
|
|
|
|
|
If a deflate(strm, Z_BLOCK) is performed by deflateParams(), and it does |
|
|
deflateParams returns Z_OK if success, Z_STREAM_ERROR if the source |
|
|
not have enough output space to complete, then the parameter change will not |
|
|
stream state was inconsistent or if a parameter was invalid, Z_BUF_ERROR if |
|
|
take effect. In this case, deflateParams() can be called again with the |
|
|
strm->avail_out was zero. |
|
|
same parameters and more output space to try again. |
|
|
|
|
|
|
|
|
|
|
|
In order to assure a change in the parameters on the first try, the |
|
|
|
|
|
deflate stream should be flushed using deflate() with Z_BLOCK or other flush |
|
|
|
|
|
request until strm.avail_out is not zero, before calling deflateParams(). |
|
|
|
|
|
Then no more input data should be provided before the deflateParams() call. |
|
|
|
|
|
If this is done, the old level and strategy will be applied to the data |
|
|
|
|
|
compressed before deflateParams(), and the new level and strategy will be |
|
|
|
|
|
applied to the the data compressed after deflateParams(). |
|
|
|
|
|
|
|
|
|
|
|
deflateParams returns Z_OK on success, Z_STREAM_ERROR if the source stream |
|
|
|
|
|
state was inconsistent or if a parameter was invalid, or Z_BUF_ERROR if |
|
|
|
|
|
there was not enough output space to complete the compression of the |
|
|
|
|
|
available input data before a change in the strategy or approach. Note that |
|
|
|
|
|
in the case of a Z_BUF_ERROR, the parameters are not changed. A return |
|
|
|
|
|
value of Z_BUF_ERROR is not fatal, in which case deflateParams() can be |
|
|
|
|
|
retried with more output space. |
|
|
*/ |
|
|
*/ |
|
|
|
|
|
|
|
|
ZEXTERN int ZEXPORT deflateTune OF((z_streamp strm, |
|
|
ZEXTERN int ZEXPORT deflateTune OF((z_streamp strm, |
|
|
@ -793,7 +855,7 @@ ZEXTERN int ZEXPORT inflateInit2 OF((z_streamp strm, |
|
|
is for use with other formats that use the deflate compressed data format |
|
|
is for use with other formats that use the deflate compressed data format |
|
|
such as zip. Those formats provide their own check values. If a custom |
|
|
such as zip. Those formats provide their own check values. If a custom |
|
|
format is developed using the raw deflate format for compressed data, it is |
|
|
format is developed using the raw deflate format for compressed data, it is |
|
|
recommended that a check value such as an adler32 or a crc32 be applied to |
|
|
recommended that a check value such as an Adler-32 or a CRC-32 be applied to |
|
|
the uncompressed data as is done in the zlib, gzip, and zip formats. For |
|
|
the uncompressed data as is done in the zlib, gzip, and zip formats. For |
|
|
most applications, the zlib format should be used as is. Note that comments |
|
|
most applications, the zlib format should be used as is. Note that comments |
|
|
above on the use in deflateInit2() applies to the magnitude of windowBits. |
|
|
above on the use in deflateInit2() applies to the magnitude of windowBits. |
|
|
@ -802,7 +864,10 @@ ZEXTERN int ZEXPORT inflateInit2 OF((z_streamp strm, |
|
|
32 to windowBits to enable zlib and gzip decoding with automatic header |
|
|
32 to windowBits to enable zlib and gzip decoding with automatic header |
|
|
detection, or add 16 to decode only the gzip format (the zlib format will |
|
|
detection, or add 16 to decode only the gzip format (the zlib format will |
|
|
return a Z_DATA_ERROR). If a gzip stream is being decoded, strm->adler is a |
|
|
return a Z_DATA_ERROR). If a gzip stream is being decoded, strm->adler is a |
|
|
crc32 instead of an adler32. |
|
|
CRC-32 instead of an Adler-32. Unlike the gunzip utility and gzread() (see |
|
|
|
|
|
below), inflate() will not automatically decode concatenated gzip streams. |
|
|
|
|
|
inflate() will return Z_STREAM_END at the end of the gzip stream. The state |
|
|
|
|
|
would need to be reset to continue decoding a subsequent gzip stream. |
|
|
|
|
|
|
|
|
inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough |
|
|
inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough |
|
|
memory, Z_VERSION_ERROR if the zlib library version is incompatible with the |
|
|
memory, Z_VERSION_ERROR if the zlib library version is incompatible with the |
|
|
@ -823,7 +888,7 @@ ZEXTERN int ZEXPORT inflateSetDictionary OF((z_streamp strm, |
|
|
Initializes the decompression dictionary from the given uncompressed byte |
|
|
Initializes the decompression dictionary from the given uncompressed byte |
|
|
sequence. This function must be called immediately after a call of inflate, |
|
|
sequence. This function must be called immediately after a call of inflate, |
|
|
if that call returned Z_NEED_DICT. The dictionary chosen by the compressor |
|
|
if that call returned Z_NEED_DICT. The dictionary chosen by the compressor |
|
|
can be determined from the adler32 value returned by that call of inflate. |
|
|
can be determined from the Adler-32 value returned by that call of inflate. |
|
|
The compressor and decompressor must use exactly the same dictionary (see |
|
|
The compressor and decompressor must use exactly the same dictionary (see |
|
|
deflateSetDictionary). For raw inflate, this function can be called at any |
|
|
deflateSetDictionary). For raw inflate, this function can be called at any |
|
|
time to set the dictionary. If the provided dictionary is smaller than the |
|
|
time to set the dictionary. If the provided dictionary is smaller than the |
|
|
@ -834,7 +899,7 @@ ZEXTERN int ZEXPORT inflateSetDictionary OF((z_streamp strm, |
|
|
inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a |
|
|
inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a |
|
|
parameter is invalid (e.g. dictionary being Z_NULL) or the stream state is |
|
|
parameter is invalid (e.g. dictionary being Z_NULL) or the stream state is |
|
|
inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the |
|
|
inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the |
|
|
expected one (incorrect adler32 value). inflateSetDictionary does not |
|
|
expected one (incorrect Adler-32 value). inflateSetDictionary does not |
|
|
perform any decompression: this will be done by subsequent calls of |
|
|
perform any decompression: this will be done by subsequent calls of |
|
|
inflate(). |
|
|
inflate(). |
|
|
*/ |
|
|
*/ |
|
|
@ -892,7 +957,7 @@ ZEXTERN int ZEXPORT inflateCopy OF((z_streamp dest, |
|
|
ZEXTERN int ZEXPORT inflateReset OF((z_streamp strm)); |
|
|
ZEXTERN int ZEXPORT inflateReset OF((z_streamp strm)); |
|
|
/*
|
|
|
/*
|
|
|
This function is equivalent to inflateEnd followed by inflateInit, |
|
|
This function is equivalent to inflateEnd followed by inflateInit, |
|
|
but does not free and reallocate all the internal decompression state. The |
|
|
but does not free and reallocate the internal decompression state. The |
|
|
stream will keep attributes that may have been set by inflateInit2. |
|
|
stream will keep attributes that may have been set by inflateInit2. |
|
|
|
|
|
|
|
|
inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source |
|
|
inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source |
|
|
@ -904,7 +969,9 @@ ZEXTERN int ZEXPORT inflateReset2 OF((z_streamp strm, |
|
|
/*
|
|
|
/*
|
|
|
This function is the same as inflateReset, but it also permits changing |
|
|
This function is the same as inflateReset, but it also permits changing |
|
|
the wrap and window size requests. The windowBits parameter is interpreted |
|
|
the wrap and window size requests. The windowBits parameter is interpreted |
|
|
the same as it is for inflateInit2. |
|
|
the same as it is for inflateInit2. If the window size is changed, then the |
|
|
|
|
|
memory allocated for the window is freed, and the window will be reallocated |
|
|
|
|
|
by inflate() if needed. |
|
|
|
|
|
|
|
|
inflateReset2 returns Z_OK if success, or Z_STREAM_ERROR if the source |
|
|
inflateReset2 returns Z_OK if success, or Z_STREAM_ERROR if the source |
|
|
stream state was inconsistent (such as zalloc or state being Z_NULL), or if |
|
|
stream state was inconsistent (such as zalloc or state being Z_NULL), or if |
|
|
@ -956,7 +1023,7 @@ ZEXTERN long ZEXPORT inflateMark OF((z_streamp strm)); |
|
|
location in the input stream can be determined from avail_in and data_type |
|
|
location in the input stream can be determined from avail_in and data_type |
|
|
as noted in the description for the Z_BLOCK flush parameter for inflate. |
|
|
as noted in the description for the Z_BLOCK flush parameter for inflate. |
|
|
|
|
|
|
|
|
inflateMark returns the value noted above or -1 << 16 if the provided |
|
|
inflateMark returns the value noted above, or -65536 if the provided |
|
|
source stream state was inconsistent. |
|
|
source stream state was inconsistent. |
|
|
*/ |
|
|
*/ |
|
|
|
|
|
|
|
|
@ -1048,9 +1115,9 @@ ZEXTERN int ZEXPORT inflateBack OF((z_streamp strm, |
|
|
This routine would normally be used in a utility that reads zip or gzip |
|
|
This routine would normally be used in a utility that reads zip or gzip |
|
|
files and writes out uncompressed files. The utility would decode the |
|
|
files and writes out uncompressed files. The utility would decode the |
|
|
header and process the trailer on its own, hence this routine expects only |
|
|
header and process the trailer on its own, hence this routine expects only |
|
|
the raw deflate stream to decompress. This is different from the normal |
|
|
the raw deflate stream to decompress. This is different from the default |
|
|
behavior of inflate(), which expects either a zlib or gzip header and |
|
|
behavior of inflate(), which expects a zlib header and trailer around the |
|
|
trailer around the deflate stream. |
|
|
deflate stream. |
|
|
|
|
|
|
|
|
inflateBack() uses two subroutines supplied by the caller that are then |
|
|
inflateBack() uses two subroutines supplied by the caller that are then |
|
|
called by inflateBack() for input and output. inflateBack() calls those |
|
|
called by inflateBack() for input and output. inflateBack() calls those |
|
|
@ -1059,12 +1126,12 @@ ZEXTERN int ZEXPORT inflateBack OF((z_streamp strm, |
|
|
parameters and return types are defined above in the in_func and out_func |
|
|
parameters and return types are defined above in the in_func and out_func |
|
|
typedefs. inflateBack() will call in(in_desc, &buf) which should return the |
|
|
typedefs. inflateBack() will call in(in_desc, &buf) which should return the |
|
|
number of bytes of provided input, and a pointer to that input in buf. If |
|
|
number of bytes of provided input, and a pointer to that input in buf. If |
|
|
there is no input available, in() must return zero--buf is ignored in that |
|
|
there is no input available, in() must return zero -- buf is ignored in that |
|
|
case--and inflateBack() will return a buffer error. inflateBack() will call |
|
|
case -- and inflateBack() will return a buffer error. inflateBack() will |
|
|
out(out_desc, buf, len) to write the uncompressed data buf[0..len-1]. out() |
|
|
call out(out_desc, buf, len) to write the uncompressed data buf[0..len-1]. |
|
|
should return zero on success, or non-zero on failure. If out() returns |
|
|
out() should return zero on success, or non-zero on failure. If out() |
|
|
non-zero, inflateBack() will return with an error. Neither in() nor out() |
|
|
returns non-zero, inflateBack() will return with an error. Neither in() nor |
|
|
are permitted to change the contents of the window provided to |
|
|
out() are permitted to change the contents of the window provided to |
|
|
inflateBackInit(), which is also the buffer that out() uses to write from. |
|
|
inflateBackInit(), which is also the buffer that out() uses to write from. |
|
|
The length written by out() will be at most the window size. Any non-zero |
|
|
The length written by out() will be at most the window size. Any non-zero |
|
|
amount of input may be provided by in(). |
|
|
amount of input may be provided by in(). |
|
|
@ -1092,7 +1159,7 @@ ZEXTERN int ZEXPORT inflateBack OF((z_streamp strm, |
|
|
using strm->next_in which will be Z_NULL only if in() returned an error. If |
|
|
using strm->next_in which will be Z_NULL only if in() returned an error. If |
|
|
strm->next_in is not Z_NULL, then the Z_BUF_ERROR was due to out() returning |
|
|
strm->next_in is not Z_NULL, then the Z_BUF_ERROR was due to out() returning |
|
|
non-zero. (in() will always be called before out(), so strm->next_in is |
|
|
non-zero. (in() will always be called before out(), so strm->next_in is |
|
|
assured to be defined if out() returns non-zero.) Note that inflateBack() |
|
|
assured to be defined if out() returns non-zero.) Note that inflateBack() |
|
|
cannot return Z_OK. |
|
|
cannot return Z_OK. |
|
|
*/ |
|
|
*/ |
|
|
|
|
|
|
|
|
@ -1114,7 +1181,7 @@ ZEXTERN uLong ZEXPORT zlibCompileFlags OF((void)); |
|
|
7.6: size of z_off_t |
|
|
7.6: size of z_off_t |
|
|
|
|
|
|
|
|
Compiler, assembler, and debug options: |
|
|
Compiler, assembler, and debug options: |
|
|
8: DEBUG |
|
|
8: ZLIB_DEBUG |
|
|
9: ASMV or ASMINF -- use ASM code |
|
|
9: ASMV or ASMINF -- use ASM code |
|
|
10: ZLIB_WINAPI -- exported functions use the WINAPI calling convention |
|
|
10: ZLIB_WINAPI -- exported functions use the WINAPI calling convention |
|
|
11: 0 (reserved) |
|
|
11: 0 (reserved) |
|
|
@ -1164,7 +1231,8 @@ ZEXTERN int ZEXPORT compress OF((Bytef *dest, uLongf *destLen, |
|
|
the byte length of the source buffer. Upon entry, destLen is the total size |
|
|
the byte length of the source buffer. Upon entry, destLen is the total size |
|
|
of the destination buffer, which must be at least the value returned by |
|
|
of the destination buffer, which must be at least the value returned by |
|
|
compressBound(sourceLen). Upon exit, destLen is the actual size of the |
|
|
compressBound(sourceLen). Upon exit, destLen is the actual size of the |
|
|
compressed buffer. |
|
|
compressed data. compress() is equivalent to compress2() with a level |
|
|
|
|
|
parameter of Z_DEFAULT_COMPRESSION. |
|
|
|
|
|
|
|
|
compress returns Z_OK if success, Z_MEM_ERROR if there was not |
|
|
compress returns Z_OK if success, Z_MEM_ERROR if there was not |
|
|
enough memory, Z_BUF_ERROR if there was not enough room in the output |
|
|
enough memory, Z_BUF_ERROR if there was not enough room in the output |
|
|
@ -1180,7 +1248,7 @@ ZEXTERN int ZEXPORT compress2 OF((Bytef *dest, uLongf *destLen, |
|
|
length of the source buffer. Upon entry, destLen is the total size of the |
|
|
length of the source buffer. Upon entry, destLen is the total size of the |
|
|
destination buffer, which must be at least the value returned by |
|
|
destination buffer, which must be at least the value returned by |
|
|
compressBound(sourceLen). Upon exit, destLen is the actual size of the |
|
|
compressBound(sourceLen). Upon exit, destLen is the actual size of the |
|
|
compressed buffer. |
|
|
compressed data. |
|
|
|
|
|
|
|
|
compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough |
|
|
compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough |
|
|
memory, Z_BUF_ERROR if there was not enough room in the output buffer, |
|
|
memory, Z_BUF_ERROR if there was not enough room in the output buffer, |
|
|
@ -1203,7 +1271,7 @@ ZEXTERN int ZEXPORT uncompress OF((Bytef *dest, uLongf *destLen, |
|
|
uncompressed data. (The size of the uncompressed data must have been saved |
|
|
uncompressed data. (The size of the uncompressed data must have been saved |
|
|
previously by the compressor and transmitted to the decompressor by some |
|
|
previously by the compressor and transmitted to the decompressor by some |
|
|
mechanism outside the scope of this compression library.) Upon exit, destLen |
|
|
mechanism outside the scope of this compression library.) Upon exit, destLen |
|
|
is the actual size of the uncompressed buffer. |
|
|
is the actual size of the uncompressed data. |
|
|
|
|
|
|
|
|
uncompress returns Z_OK if success, Z_MEM_ERROR if there was not |
|
|
uncompress returns Z_OK if success, Z_MEM_ERROR if there was not |
|
|
enough memory, Z_BUF_ERROR if there was not enough room in the output |
|
|
enough memory, Z_BUF_ERROR if there was not enough room in the output |
|
|
@ -1212,6 +1280,14 @@ ZEXTERN int ZEXPORT uncompress OF((Bytef *dest, uLongf *destLen, |
|
|
buffer with the uncompressed data up to that point. |
|
|
buffer with the uncompressed data up to that point. |
|
|
*/ |
|
|
*/ |
|
|
|
|
|
|
|
|
|
|
|
ZEXTERN int ZEXPORT uncompress2 OF((Bytef *dest, uLongf *destLen, |
|
|
|
|
|
const Bytef *source, uLong *sourceLen)); |
|
|
|
|
|
/*
|
|
|
|
|
|
Same as uncompress, except that sourceLen is a pointer, where the |
|
|
|
|
|
length of the source is *sourceLen. On return, *sourceLen is the number of |
|
|
|
|
|
source bytes consumed. |
|
|
|
|
|
*/ |
|
|
|
|
|
|
|
|
/* gzip file access functions */ |
|
|
/* gzip file access functions */ |
|
|
|
|
|
|
|
|
/*
|
|
|
/*
|
|
|
@ -1290,10 +1366,9 @@ ZEXTERN int ZEXPORT gzbuffer OF((gzFile file, unsigned size)); |
|
|
default buffer size is 8192 bytes. This function must be called after |
|
|
default buffer size is 8192 bytes. This function must be called after |
|
|
gzopen() or gzdopen(), and before any other calls that read or write the |
|
|
gzopen() or gzdopen(), and before any other calls that read or write the |
|
|
file. The buffer memory allocation is always deferred to the first read or |
|
|
file. The buffer memory allocation is always deferred to the first read or |
|
|
write. Two buffers are allocated, either both of the specified size when |
|
|
write. Three times that size in buffer space is allocated. A larger buffer |
|
|
writing, or one of the specified size and the other twice that size when |
|
|
size of, for example, 64K or 128K bytes will noticeably increase the speed |
|
|
reading. A larger buffer size of, for example, 64K or 128K bytes will |
|
|
of decompression (reading). |
|
|
noticeably increase the speed of decompression (reading). |
|
|
|
|
|
|
|
|
|
|
|
The new buffer size also affects the maximum length for gzprintf(). |
|
|
The new buffer size also affects the maximum length for gzprintf(). |
|
|
|
|
|
|
|
|
@ -1304,10 +1379,12 @@ ZEXTERN int ZEXPORT gzbuffer OF((gzFile file, unsigned size)); |
|
|
ZEXTERN int ZEXPORT gzsetparams OF((gzFile file, int level, int strategy)); |
|
|
ZEXTERN int ZEXPORT gzsetparams OF((gzFile file, int level, int strategy)); |
|
|
/*
|
|
|
/*
|
|
|
Dynamically update the compression level or strategy. See the description |
|
|
Dynamically update the compression level or strategy. See the description |
|
|
of deflateInit2 for the meaning of these parameters. |
|
|
of deflateInit2 for the meaning of these parameters. Previously provided |
|
|
|
|
|
data is flushed before the parameter change. |
|
|
|
|
|
|
|
|
gzsetparams returns Z_OK if success, or Z_STREAM_ERROR if the file was not |
|
|
gzsetparams returns Z_OK if success, Z_STREAM_ERROR if the file was not |
|
|
opened for writing. |
|
|
opened for writing, Z_ERRNO if there is an error writing the flushed data, |
|
|
|
|
|
or Z_MEM_ERROR if there is a memory allocation error. |
|
|
*/ |
|
|
*/ |
|
|
|
|
|
|
|
|
ZEXTERN int ZEXPORT gzread OF((gzFile file, voidp buf, unsigned len)); |
|
|
ZEXTERN int ZEXPORT gzread OF((gzFile file, voidp buf, unsigned len)); |
|
|
@ -1335,7 +1412,35 @@ ZEXTERN int ZEXPORT gzread OF((gzFile file, voidp buf, unsigned len)); |
|
|
case. |
|
|
case. |
|
|
|
|
|
|
|
|
gzread returns the number of uncompressed bytes actually read, less than |
|
|
gzread returns the number of uncompressed bytes actually read, less than |
|
|
len for end of file, or -1 for error. |
|
|
len for end of file, or -1 for error. If len is too large to fit in an int, |
|
|
|
|
|
then nothing is read, -1 is returned, and the error state is set to |
|
|
|
|
|
Z_STREAM_ERROR. |
|
|
|
|
|
*/ |
|
|
|
|
|
|
|
|
|
|
|
ZEXTERN z_size_t ZEXPORT gzfread OF((voidp buf, z_size_t size, z_size_t nitems, |
|
|
|
|
|
gzFile file)); |
|
|
|
|
|
/*
|
|
|
|
|
|
Read up to nitems items of size size from file to buf, otherwise operating |
|
|
|
|
|
as gzread() does. This duplicates the interface of stdio's fread(), with |
|
|
|
|
|
size_t request and return types. If the library defines size_t, then |
|
|
|
|
|
z_size_t is identical to size_t. If not, then z_size_t is an unsigned |
|
|
|
|
|
integer type that can contain a pointer. |
|
|
|
|
|
|
|
|
|
|
|
gzfread() returns the number of full items read of size size, or zero if |
|
|
|
|
|
the end of the file was reached and a full item could not be read, or if |
|
|
|
|
|
there was an error. gzerror() must be consulted if zero is returned in |
|
|
|
|
|
order to determine if there was an error. If the multiplication of size and |
|
|
|
|
|
nitems overflows, i.e. the product does not fit in a z_size_t, then nothing |
|
|
|
|
|
is read, zero is returned, and the error state is set to Z_STREAM_ERROR. |
|
|
|
|
|
|
|
|
|
|
|
In the event that the end of file is reached and only a partial item is |
|
|
|
|
|
available at the end, i.e. the remaining uncompressed data length is not a |
|
|
|
|
|
multiple of size, then the final partial item is nevetheless read into buf |
|
|
|
|
|
and the end-of-file flag is set. The length of the partial item read is not |
|
|
|
|
|
provided, but could be inferred from the result of gztell(). This behavior |
|
|
|
|
|
is the same as the behavior of fread() implementations in common libraries, |
|
|
|
|
|
but it prevents the direct use of gzfread() to read a concurrently written |
|
|
|
|
|
file, reseting and retrying on end-of-file, when size is not 1. |
|
|
*/ |
|
|
*/ |
|
|
|
|
|
|
|
|
ZEXTERN int ZEXPORT gzwrite OF((gzFile file, |
|
|
ZEXTERN int ZEXPORT gzwrite OF((gzFile file, |
|
|
@ -1346,19 +1451,33 @@ ZEXTERN int ZEXPORT gzwrite OF((gzFile file, |
|
|
error. |
|
|
error. |
|
|
*/ |
|
|
*/ |
|
|
|
|
|
|
|
|
|
|
|
ZEXTERN z_size_t ZEXPORT gzfwrite OF((voidpc buf, z_size_t size, |
|
|
|
|
|
z_size_t nitems, gzFile file)); |
|
|
|
|
|
/*
|
|
|
|
|
|
gzfwrite() writes nitems items of size size from buf to file, duplicating |
|
|
|
|
|
the interface of stdio's fwrite(), with size_t request and return types. If |
|
|
|
|
|
the library defines size_t, then z_size_t is identical to size_t. If not, |
|
|
|
|
|
then z_size_t is an unsigned integer type that can contain a pointer. |
|
|
|
|
|
|
|
|
|
|
|
gzfwrite() returns the number of full items written of size size, or zero |
|
|
|
|
|
if there was an error. If the multiplication of size and nitems overflows, |
|
|
|
|
|
i.e. the product does not fit in a z_size_t, then nothing is written, zero |
|
|
|
|
|
is returned, and the error state is set to Z_STREAM_ERROR. |
|
|
|
|
|
*/ |
|
|
|
|
|
|
|
|
ZEXTERN int ZEXPORTVA gzprintf Z_ARG((gzFile file, const char *format, ...)); |
|
|
ZEXTERN int ZEXPORTVA gzprintf Z_ARG((gzFile file, const char *format, ...)); |
|
|
/*
|
|
|
/*
|
|
|
Converts, formats, and writes the arguments to the compressed file under |
|
|
Converts, formats, and writes the arguments to the compressed file under |
|
|
control of the format string, as in fprintf. gzprintf returns the number of |
|
|
control of the format string, as in fprintf. gzprintf returns the number of |
|
|
uncompressed bytes actually written, or 0 in case of error. The number of |
|
|
uncompressed bytes actually written, or a negative zlib error code in case |
|
|
uncompressed bytes written is limited to 8191, or one less than the buffer |
|
|
of error. The number of uncompressed bytes written is limited to 8191, or |
|
|
size given to gzbuffer(). The caller should assure that this limit is not |
|
|
one less than the buffer size given to gzbuffer(). The caller should assure |
|
|
exceeded. If it is exceeded, then gzprintf() will return an error (0) with |
|
|
that this limit is not exceeded. If it is exceeded, then gzprintf() will |
|
|
nothing written. In this case, there may also be a buffer overflow with |
|
|
return an error (0) with nothing written. In this case, there may also be a |
|
|
unpredictable consequences, which is possible only if zlib was compiled with |
|
|
buffer overflow with unpredictable consequences, which is possible only if |
|
|
the insecure functions sprintf() or vsprintf() because the secure snprintf() |
|
|
zlib was compiled with the insecure functions sprintf() or vsprintf() |
|
|
or vsnprintf() functions were not available. This can be determined using |
|
|
because the secure snprintf() or vsnprintf() functions were not available. |
|
|
zlibCompileFlags(). |
|
|
This can be determined using zlibCompileFlags(). |
|
|
*/ |
|
|
*/ |
|
|
|
|
|
|
|
|
ZEXTERN int ZEXPORT gzputs OF((gzFile file, const char *s)); |
|
|
ZEXTERN int ZEXPORT gzputs OF((gzFile file, const char *s)); |
|
|
@ -1418,7 +1537,7 @@ ZEXTERN int ZEXPORT gzflush OF((gzFile file, int flush)); |
|
|
If the flush parameter is Z_FINISH, the remaining data is written and the |
|
|
If the flush parameter is Z_FINISH, the remaining data is written and the |
|
|
gzip stream is completed in the output. If gzwrite() is called again, a new |
|
|
gzip stream is completed in the output. If gzwrite() is called again, a new |
|
|
gzip stream will be started in the output. gzread() is able to read such |
|
|
gzip stream will be started in the output. gzread() is able to read such |
|
|
concatented gzip streams. |
|
|
concatenated gzip streams. |
|
|
|
|
|
|
|
|
gzflush should be called only when strictly necessary because it will |
|
|
gzflush should be called only when strictly necessary because it will |
|
|
degrade compression if called too often. |
|
|
degrade compression if called too often. |
|
|
@ -1572,7 +1691,7 @@ ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len)); |
|
|
return the updated checksum. If buf is Z_NULL, this function returns the |
|
|
return the updated checksum. If buf is Z_NULL, this function returns the |
|
|
required initial value for the checksum. |
|
|
required initial value for the checksum. |
|
|
|
|
|
|
|
|
An Adler-32 checksum is almost as reliable as a CRC32 but can be computed |
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An Adler-32 checksum is almost as reliable as a CRC-32 but can be computed |
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much faster. |
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much faster. |
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Usage example: |
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Usage example: |
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@ -1585,6 +1704,12 @@ ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len)); |
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if (adler != original_adler) error(); |
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if (adler != original_adler) error(); |
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*/ |
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*/ |
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ZEXTERN uLong ZEXPORT adler32_z OF((uLong adler, const Bytef *buf, |
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z_size_t len)); |
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/*
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Same as adler32(), but with a size_t length. |
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*/ |
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/*
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/*
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ZEXTERN uLong ZEXPORT adler32_combine OF((uLong adler1, uLong adler2, |
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ZEXTERN uLong ZEXPORT adler32_combine OF((uLong adler1, uLong adler2, |
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z_off_t len2)); |
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z_off_t len2)); |
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@ -1614,6 +1739,12 @@ ZEXTERN uLong ZEXPORT crc32 OF((uLong crc, const Bytef *buf, uInt len)); |
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if (crc != original_crc) error(); |
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if (crc != original_crc) error(); |
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*/ |
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*/ |
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ZEXTERN uLong ZEXPORT crc32_z OF((uLong adler, const Bytef *buf, |
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z_size_t len)); |
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/*
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Same as crc32(), but with a size_t length. |
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*/ |
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/*
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/*
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ZEXTERN uLong ZEXPORT crc32_combine OF((uLong crc1, uLong crc2, z_off_t len2)); |
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ZEXTERN uLong ZEXPORT crc32_combine OF((uLong crc1, uLong crc2, z_off_t len2)); |
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@ -1644,19 +1775,35 @@ ZEXTERN int ZEXPORT inflateBackInit_ OF((z_streamp strm, int windowBits, |
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unsigned char FAR *window, |
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unsigned char FAR *window, |
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const char *version, |
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const char *version, |
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int stream_size)); |
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int stream_size)); |
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#define deflateInit(strm, level) \ |
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#ifdef Z_PREFIX_SET |
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deflateInit_((strm), (level), ZLIB_VERSION, (int)sizeof(z_stream)) |
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# define z_deflateInit(strm, level) \ |
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#define inflateInit(strm) \ |
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deflateInit_((strm), (level), ZLIB_VERSION, (int)sizeof(z_stream)) |
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inflateInit_((strm), ZLIB_VERSION, (int)sizeof(z_stream)) |
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# define z_inflateInit(strm) \ |
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#define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \ |
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inflateInit_((strm), ZLIB_VERSION, (int)sizeof(z_stream)) |
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deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\ |
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# define z_deflateInit2(strm, level, method, windowBits, memLevel, strategy) \ |
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(strategy), ZLIB_VERSION, (int)sizeof(z_stream)) |
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deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\ |
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#define inflateInit2(strm, windowBits) \ |
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(strategy), ZLIB_VERSION, (int)sizeof(z_stream)) |
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inflateInit2_((strm), (windowBits), ZLIB_VERSION, \ |
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# define z_inflateInit2(strm, windowBits) \ |
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(int)sizeof(z_stream)) |
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inflateInit2_((strm), (windowBits), ZLIB_VERSION, \ |
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#define inflateBackInit(strm, windowBits, window) \ |
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(int)sizeof(z_stream)) |
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inflateBackInit_((strm), (windowBits), (window), \ |
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# define z_inflateBackInit(strm, windowBits, window) \ |
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ZLIB_VERSION, (int)sizeof(z_stream)) |
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inflateBackInit_((strm), (windowBits), (window), \ |
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ZLIB_VERSION, (int)sizeof(z_stream)) |
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#else |
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# define deflateInit(strm, level) \ |
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deflateInit_((strm), (level), ZLIB_VERSION, (int)sizeof(z_stream)) |
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# define inflateInit(strm) \ |
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inflateInit_((strm), ZLIB_VERSION, (int)sizeof(z_stream)) |
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# define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \ |
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deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\ |
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(strategy), ZLIB_VERSION, (int)sizeof(z_stream)) |
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# define inflateInit2(strm, windowBits) \ |
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inflateInit2_((strm), (windowBits), ZLIB_VERSION, \ |
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(int)sizeof(z_stream)) |
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# define inflateBackInit(strm, windowBits, window) \ |
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inflateBackInit_((strm), (windowBits), (window), \ |
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ZLIB_VERSION, (int)sizeof(z_stream)) |
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#endif |
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#ifndef Z_SOLO |
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#ifndef Z_SOLO |
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@ -1676,10 +1823,10 @@ ZEXTERN int ZEXPORT gzgetc_ OF((gzFile file)); /* backward compatibility */ |
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#ifdef Z_PREFIX_SET |
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#ifdef Z_PREFIX_SET |
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# undef z_gzgetc |
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# undef z_gzgetc |
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# define z_gzgetc(g) \ |
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# define z_gzgetc(g) \ |
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((g)->have ? ((g)->have--, (g)->pos++, *((g)->next)++) : gzgetc(g)) |
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((g)->have ? ((g)->have--, (g)->pos++, *((g)->next)++) : (gzgetc)(g)) |
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#else |
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#else |
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# define gzgetc(g) \ |
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# define gzgetc(g) \ |
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((g)->have ? ((g)->have--, (g)->pos++, *((g)->next)++) : gzgetc(g)) |
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((g)->have ? ((g)->have--, (g)->pos++, *((g)->next)++) : (gzgetc)(g)) |
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#endif |
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#endif |
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/* provide 64-bit offset functions if _LARGEFILE64_SOURCE defined, and/or
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/* provide 64-bit offset functions if _LARGEFILE64_SOURCE defined, and/or
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@ -1737,19 +1884,16 @@ ZEXTERN int ZEXPORT gzgetc_ OF((gzFile file)); /* backward compatibility */ |
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#endif /* !Z_SOLO */ |
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#endif /* !Z_SOLO */ |
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/* hack for buggy compilers */ |
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#if !defined(ZUTIL_H) && !defined(NO_DUMMY_DECL) |
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struct internal_state {int dummy;}; |
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#endif |
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/* undocumented functions */ |
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/* undocumented functions */ |
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ZEXTERN const char * ZEXPORT zError OF((int)); |
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ZEXTERN const char * ZEXPORT zError OF((int)); |
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ZEXTERN int ZEXPORT inflateSyncPoint OF((z_streamp)); |
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ZEXTERN int ZEXPORT inflateSyncPoint OF((z_streamp)); |
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ZEXTERN const z_crc_t FAR * ZEXPORT get_crc_table OF((void)); |
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ZEXTERN const z_crc_t FAR * ZEXPORT get_crc_table OF((void)); |
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ZEXTERN int ZEXPORT inflateUndermine OF((z_streamp, int)); |
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ZEXTERN int ZEXPORT inflateUndermine OF((z_streamp, int)); |
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ZEXTERN int ZEXPORT inflateValidate OF((z_streamp, int)); |
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ZEXTERN unsigned long ZEXPORT inflateCodesUsed OF ((z_streamp)); |
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ZEXTERN int ZEXPORT inflateResetKeep OF((z_streamp)); |
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ZEXTERN int ZEXPORT inflateResetKeep OF((z_streamp)); |
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ZEXTERN int ZEXPORT deflateResetKeep OF((z_streamp)); |
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ZEXTERN int ZEXPORT deflateResetKeep OF((z_streamp)); |
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#if defined(_WIN32) && !defined(Z_SOLO) |
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#if (defined(_WIN32) || defined(__CYGWIN__)) && !defined(Z_SOLO) |
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ZEXTERN gzFile ZEXPORT gzopen_w OF((const wchar_t *path, |
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ZEXTERN gzFile ZEXPORT gzopen_w OF((const wchar_t *path, |
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const char *mode)); |
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const char *mode)); |
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#endif |
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#endif |
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Sam Roberts
8 years ago
Myles Borins