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66 lines
1.9 KiB
66 lines
1.9 KiB
/* Simple wrapper to create zlib or raw encodings of hex. */
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#include <bitcoin/short_channel_id.h>
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#include <ccan/err/err.h>
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#include <ccan/str/hex/hex.h>
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#include <common/decode_short_channel_ids.h>
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#include <common/utils.h>
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#include <stdio.h>
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#include <wire/wire.h>
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#include <zlib.h>
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static NORETURN void usage(void)
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{
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errx(1, "Usage: mkencoded <encoding> <hexstr>, OR\n"
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"mkencoded --scids <encoding> <scid>...");
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}
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int main(int argc, char *argv[])
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{
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u8 encoding, *data;
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setup_locale();
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if (argv[1] && streq(argv[1], "--scids")) {
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argv++;
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argc--;
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if (argc < 2)
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usage();
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data = tal_arr(NULL, u8, 0);
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for (size_t i = 2; i < argc; i++) {
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struct short_channel_id scid;
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if (!short_channel_id_from_str(argv[i], strlen(argv[i]),
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&scid))
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errx(1, "Invalid short_channel_id %s", argv[i]);
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towire_short_channel_id(&data, &scid);
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}
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} else {
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data = tal_hexdata(NULL, argv[2], strlen(argv[2]));
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if (!data)
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errx(1, "Invalid hex string %s", argv[2]);
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}
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if (!hex_decode(argv[1], strlen(argv[1]), &encoding, sizeof(encoding)))
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errx(1, "Expected single hex byte not %s", argv[1]);
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if (encoding == SHORTIDS_UNCOMPRESSED)
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printf("%02x%s\n", encoding, tal_hex(NULL, data));
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else if (encoding == SHORTIDS_ZLIB) {
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/* https://www.zlib.net/zlib_tech.html:
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* the only expansion is an overhead of five bytes per 16 KB
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* block (about 0.03%), plus a one-time overhead of six bytes
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* for the entire stream.
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*/
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unsigned long compressed_len = tal_bytelen(data)
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+ 6 + 5*(tal_bytelen(data) + 16384)/16384;
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u8 *z = tal_arr(NULL, u8, compressed_len);
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if (compress2(z, &compressed_len, data, tal_bytelen(data),
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Z_DEFAULT_COMPRESSION) != Z_OK)
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errx(1, "Error compressing stream?");
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printf("%02x%s\n", encoding,
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tal_hexstr(NULL, z, compressed_len));
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} else {
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errx(1, "Unknown encoding %u", encoding);
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}
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return 0;
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}
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