// Copyright Joyent, Inc. and other Node contributors. // // Permission is hereby granted, free of charge, to any person obtaining a // copy of this software and associated documentation files (the // "Software"), to deal in the Software without restriction, including // without limitation the rights to use, copy, modify, merge, publish, // distribute, sublicense, and/or sell copies of the Software, and to permit // persons to whom the Software is furnished to do so, subject to the // following conditions: // // The above copyright notice and this permission notice shall be included // in all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE // USE OR OTHER DEALINGS IN THE SOFTWARE. var SlowBuffer = process.binding('buffer').SlowBuffer; var assert = require('assert'); exports.INSPECT_MAX_BYTES = 50; // Make SlowBuffer inherit from Buffer. // This is an exception to the rule that __proto__ is not allowed in core. SlowBuffer.prototype.__proto__ = Buffer.prototype; function toHex(n) { if (n < 16) return '0' + n.toString(16); return n.toString(16); } SlowBuffer.prototype.toString = function(encoding, start, end) { encoding = String(encoding || 'utf8').toLowerCase(); start = +start || 0; if (typeof end == 'undefined') end = this.length; // Fastpath empty strings if (+end == start) { return ''; } switch (encoding) { case 'hex': return this.hexSlice(start, end); case 'utf8': case 'utf-8': return this.utf8Slice(start, end); case 'ascii': return this.asciiSlice(start, end); case 'binary': return this.binarySlice(start, end); case 'base64': return this.base64Slice(start, end); case 'ucs2': case 'ucs-2': case 'utf16le': case 'utf-16le': return this.ucs2Slice(start, end); default: throw new TypeError('Unknown encoding: ' + encoding); } }; SlowBuffer.prototype.write = function(string, offset, length, encoding) { // Support both (string, offset, length, encoding) // and the legacy (string, encoding, offset, length) if (isFinite(offset)) { if (!isFinite(length)) { encoding = length; length = undefined; } } else { // legacy var swap = encoding; encoding = offset; offset = length; length = swap; } offset = +offset || 0; var remaining = this.length - offset; if (!length) { length = remaining; } else { length = +length; if (length > remaining) { length = remaining; } } encoding = String(encoding || 'utf8').toLowerCase(); switch (encoding) { case 'hex': return this.hexWrite(string, offset, length); case 'utf8': case 'utf-8': return this.utf8Write(string, offset, length); case 'ascii': return this.asciiWrite(string, offset, length); case 'binary': return this.binaryWrite(string, offset, length); case 'base64': return this.base64Write(string, offset, length); case 'ucs2': case 'ucs-2': case 'utf16le': case 'utf-16le': return this.ucs2Write(string, offset, length); default: throw new TypeError('Unknown encoding: ' + encoding); } }; // slice(start, end) SlowBuffer.prototype.slice = function(start, end) { if (end === undefined) end = this.length; if (end > this.length) { throw new RangeError('end > this.length'); } if (start > end) { throw new RangeError('start > end'); } return new Buffer(this, end - start, +start); }; function coerce(length) { // Coerce length to a number (possibly NaN), round up // in case it's fractional (e.g. 123.456). Since NaN // comparisons are always false, use to return zero. length = Math.ceil(+length); return length > 0 ? length : 0; } var zeroBuffer = new SlowBuffer(0); // Buffer function Buffer(subject, encoding, offset) { if (!(this instanceof Buffer)) { return new Buffer(subject, encoding, offset); } var type; // Are we slicing? if (typeof offset === 'number') { if (!Buffer.isBuffer(subject)) { throw new TypeError('First argument must be a Buffer when slicing'); } this.length = coerce(encoding); this.parent = subject.parent ? subject.parent : subject; this.offset = offset; } else { // Find the length switch (type = typeof subject) { case 'number': this.length = coerce(subject); break; case 'string': this.length = Buffer.byteLength(subject, encoding); break; case 'object': // Assume object is an array this.length = coerce(subject.length); break; default: throw new TypeError('First argument needs to be a number, ' + 'array or string.'); } if (this.length > Buffer.poolSize) { // Big buffer, just alloc one. this.parent = new SlowBuffer(this.length); this.offset = 0; } else if (this.length > 0) { // Small buffer. if (!pool || pool.length - pool.used < this.length) allocPool(); this.parent = pool; this.offset = pool.used; pool.used += this.length; if (pool.used & 7) pool.used = (pool.used + 8) & ~7; } else { // Zero-length buffer this.parent = zeroBuffer; this.offset = 0; } // Treat array-ish objects as a byte array. if (isArrayIsh(subject)) { for (var i = 0; i < this.length; i++) { this.parent[i + this.offset] = subject[i]; } } else if (type == 'string') { // We are a string this.length = this.write(subject, 0, encoding); } } SlowBuffer.makeFastBuffer(this.parent, this, this.offset, this.length); } function isArrayIsh(subject) { return Array.isArray(subject) || Buffer.isBuffer(subject) || subject && typeof subject === 'object' && typeof subject.length === 'number'; } exports.SlowBuffer = SlowBuffer; exports.Buffer = Buffer; Buffer.isEncoding = function(encoding) { switch (encoding && encoding.toLowerCase()) { case 'hex': case 'utf8': case 'utf-8': case 'ascii': case 'binary': case 'base64': case 'ucs2': case 'ucs-2': case 'utf16le': case 'utf-16le': case 'raw': return true; default: return false; } }; Buffer.poolSize = 8 * 1024; var pool; function allocPool() { pool = new SlowBuffer(Buffer.poolSize); pool.used = 0; } // Static methods Buffer.isBuffer = function isBuffer(b) { return b instanceof Buffer; }; // Inspect Buffer.prototype.inspect = function inspect() { var out = [], len = this.length, name = this.constructor.name; for (var i = 0; i < len; i++) { out[i] = toHex(this[i]); if (i == exports.INSPECT_MAX_BYTES) { out[i + 1] = '...'; break; } } return '<' + name + ' ' + out.join(' ') + '>'; }; Buffer.prototype.get = function get(offset) { if (offset < 0 || offset >= this.length) throw new RangeError('offset is out of bounds'); return this.parent[this.offset + offset]; }; Buffer.prototype.set = function set(offset, v) { if (offset < 0 || offset >= this.length) throw new RangeError('offset is out of bounds'); return this.parent[this.offset + offset] = v; }; // write(string, offset = 0, length = buffer.length-offset, encoding = 'utf8') Buffer.prototype.write = function(string, offset, length, encoding) { // Support both (string, offset, length, encoding) // and the legacy (string, encoding, offset, length) if (isFinite(offset)) { if (!isFinite(length)) { encoding = length; length = undefined; } } else { // legacy var swap = encoding; encoding = offset; offset = length; length = swap; } offset = +offset || 0; var remaining = this.length - offset; if (!length) { length = remaining; } else { length = +length; if (length > remaining) { length = remaining; } } encoding = String(encoding || 'utf8').toLowerCase(); var ret; switch (encoding) { case 'hex': ret = this.parent.hexWrite(string, this.offset + offset, length); break; case 'utf8': case 'utf-8': ret = this.parent.utf8Write(string, this.offset + offset, length); break; case 'ascii': ret = this.parent.asciiWrite(string, this.offset + offset, length); break; case 'binary': ret = this.parent.binaryWrite(string, this.offset + offset, length); break; case 'base64': // Warning: maxLength not taken into account in base64Write ret = this.parent.base64Write(string, this.offset + offset, length); break; case 'ucs2': case 'ucs-2': case 'utf16le': case 'utf-16le': ret = this.parent.ucs2Write(string, this.offset + offset, length); break; default: throw new TypeError('Unknown encoding: ' + encoding); } Buffer._charsWritten = SlowBuffer._charsWritten; return ret; }; Buffer.prototype.toJSON = function() { return Array.prototype.slice.call(this, 0); }; // toString(encoding, start=0, end=buffer.length) Buffer.prototype.toString = function(encoding, start, end) { encoding = String(encoding || 'utf8').toLowerCase(); if (typeof start == 'undefined' || start < 0) { start = 0; } else if (start > this.length) { start = this.length; } if (typeof end == 'undefined' || end > this.length) { end = this.length; } else if (end < 0) { end = 0; } start = start + this.offset; end = end + this.offset; switch (encoding) { case 'hex': return this.parent.hexSlice(start, end); case 'utf8': case 'utf-8': return this.parent.utf8Slice(start, end); case 'ascii': return this.parent.asciiSlice(start, end); case 'binary': return this.parent.binarySlice(start, end); case 'base64': return this.parent.base64Slice(start, end); case 'ucs2': case 'ucs-2': case 'utf16le': case 'utf-16le': return this.parent.ucs2Slice(start, end); default: throw new TypeError('Unknown encoding: ' + encoding); } }; // byteLength Buffer.byteLength = SlowBuffer.byteLength; // fill(value, start=0, end=buffer.length) Buffer.prototype.fill = function fill(value, start, end) { value || (value = 0); start || (start = 0); end || (end = this.length); if (typeof value === 'string') { value = value.charCodeAt(0); } if (!(typeof value === 'number') || isNaN(value)) { throw new TypeError('value is not a number'); } if (end < start) throw new RangeError('end < start'); // Fill 0 bytes; we're done if (end === start) return 0; if (this.length == 0) return 0; if (start < 0 || start >= this.length) { throw new RangeError('start out of bounds'); } if (end < 0 || end > this.length) { throw new RangeError('end out of bounds'); } return this.parent.fill(value, start + this.offset, end + this.offset); }; Buffer.concat = function(list, length) { if (!Array.isArray(list)) { throw new TypeError('Usage: Buffer.concat(list, [length])'); } if (list.length === 0) { return new Buffer(0); } else if (list.length === 1) { return list[0]; } if (typeof length !== 'number') { length = 0; for (var i = 0; i < list.length; i++) { var buf = list[i]; length += buf.length; } } var buffer = new Buffer(length); var pos = 0; for (var i = 0; i < list.length; i++) { var buf = list[i]; buf.copy(buffer, pos); pos += buf.length; } return buffer; }; // copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length) Buffer.prototype.copy = function(target, target_start, start, end) { // set undefined/NaN or out of bounds values equal to their default if (!(target_start >= 0)) target_start = 0; if (!(start >= 0)) start = 0; if (!(end < this.length)) end = this.length; // Copy 0 bytes; we're done if (end === start || target.length === 0 || this.length === 0 || start > this.length) return 0; if (end < start) throw new RangeError('sourceEnd < sourceStart'); if (target_start >= target.length) throw new RangeError('targetStart out of bounds'); if (target.length - target_start < end - start) end = target.length - target_start + start; return this.parent.copy(target.parent || target, target_start + (target.offset || 0), start + this.offset, end + this.offset); }; // slice(start, end) Buffer.prototype.slice = function(start, end) { if (end === undefined) end = this.length; if (end > this.length) throw new RangeError('end > this.length'); if (start > end) throw new RangeError('start > end'); if (start < 0) throw new RangeError('start < 0'); return new Buffer(this.parent, end - start, +start + this.offset); }; // Legacy methods for backwards compatibility. Buffer.prototype.utf8Slice = function(start, end) { return this.toString('utf8', start, end); }; Buffer.prototype.binarySlice = function(start, end) { return this.toString('binary', start, end); }; Buffer.prototype.asciiSlice = function(start, end) { return this.toString('ascii', start, end); }; Buffer.prototype.utf8Write = function(string, offset) { return this.write(string, offset, 'utf8'); }; Buffer.prototype.binaryWrite = function(string, offset) { return this.write(string, offset, 'binary'); }; Buffer.prototype.asciiWrite = function(string, offset) { return this.write(string, offset, 'ascii'); }; /* * Need to make sure that buffer isn't trying to write out of bounds. * This check is far too slow internally for fast buffers. */ function checkOffset(offset, ext, length) { if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint'); if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length'); } Buffer.prototype.readUInt8 = function(offset, noAssert) { if (!noAssert) checkOffset(offset, 1, this.length); return this[offset]; }; function readUInt16(buffer, offset, isBigEndian) { var val = 0; if (isBigEndian) { val = buffer[offset] << 8; val |= buffer[offset + 1]; } else { val = buffer[offset]; val |= buffer[offset + 1] << 8; } return val; } Buffer.prototype.readUInt16LE = function(offset, noAssert) { if (!noAssert) checkOffset(offset, 2, this.length); return readUInt16(this, offset, false, noAssert); }; Buffer.prototype.readUInt16BE = function(offset, noAssert) { if (!noAssert) checkOffset(offset, 2, this.length); return readUInt16(this, offset, true, noAssert); }; function readUInt32(buffer, offset, isBigEndian, noAssert) { var val = 0; if (isBigEndian) { val = buffer[offset + 1] << 16; val |= buffer[offset + 2] << 8; val |= buffer[offset + 3]; val = val + (buffer[offset] << 24 >>> 0); } else { val = buffer[offset + 2] << 16; val |= buffer[offset + 1] << 8; val |= buffer[offset]; val = val + (buffer[offset + 3] << 24 >>> 0); } return val; } Buffer.prototype.readUInt32LE = function(offset, noAssert) { if (!noAssert) checkOffset(offset, 4, this.length); return readUInt32(this, offset, false, noAssert); }; Buffer.prototype.readUInt32BE = function(offset, noAssert) { if (!noAssert) checkOffset(offset, 4, this.length); return readUInt32(this, offset, true, noAssert); }; /* * Signed integer types, yay team! A reminder on how two's complement actually * works. The first bit is the signed bit, i.e. tells us whether or not the * number should be positive or negative. If the two's complement value is * positive, then we're done, as it's equivalent to the unsigned representation. * * Now if the number is positive, you're pretty much done, you can just leverage * the unsigned translations and return those. Unfortunately, negative numbers * aren't quite that straightforward. * * At first glance, one might be inclined to use the traditional formula to * translate binary numbers between the positive and negative values in two's * complement. (Though it doesn't quite work for the most negative value) * Mainly: * - invert all the bits * - add one to the result * * Of course, this doesn't quite work in Javascript. Take for example the value * of -128. This could be represented in 16 bits (big-endian) as 0xff80. But of * course, Javascript will do the following: * * > ~0xff80 * -65409 * * Whoh there, Javascript, that's not quite right. But wait, according to * Javascript that's perfectly correct. When Javascript ends up seeing the * constant 0xff80, it has no notion that it is actually a signed number. It * assumes that we've input the unsigned value 0xff80. Thus, when it does the * binary negation, it casts it into a signed value, (positive 0xff80). Then * when you perform binary negation on that, it turns it into a negative number. * * Instead, we're going to have to use the following general formula, that works * in a rather Javascript friendly way. I'm glad we don't support this kind of * weird numbering scheme in the kernel. * * (BIT-MAX - (unsigned)val + 1) * -1 * * The astute observer, may think that this doesn't make sense for 8-bit numbers * (really it isn't necessary for them). However, when you get 16-bit numbers, * you do. Let's go back to our prior example and see how this will look: * * (0xffff - 0xff80 + 1) * -1 * (0x007f + 1) * -1 * (0x0080) * -1 */ Buffer.prototype.readInt8 = function(offset, noAssert) { if (!noAssert) checkOffset(offset, 1, this.length); if (!(this[offset] & 0x80)) return (this[offset]); return ((0xff - this[offset] + 1) * -1); }; function readInt16(buffer, offset, isBigEndian) { var val = readUInt16(buffer, offset, isBigEndian); if (!(val & 0x8000)) return val; return (0xffff - val + 1) * -1; } Buffer.prototype.readInt16LE = function(offset, noAssert) { if (!noAssert) checkOffset(offset, 2, this.length); return readInt16(this, offset, false); }; Buffer.prototype.readInt16BE = function(offset, noAssert) { if (!noAssert) checkOffset(offset, 2, this.length); return readInt16(this, offset, true); }; function readInt32(buffer, offset, isBigEndian) { var val = readUInt32(buffer, offset, isBigEndian); if (!(val & 0x80000000)) return (val); return (0xffffffff - val + 1) * -1; } Buffer.prototype.readInt32LE = function(offset, noAssert) { if (!noAssert) checkOffset(offset, 2, this.length); return readInt32(this, offset, false); }; Buffer.prototype.readInt32BE = function(offset, noAssert) { if (!noAssert) checkOffset(offset, 2, this.length); return readInt32(this, offset, true); }; Buffer.prototype.readFloatLE = function(offset, noAssert) { if (!noAssert) checkOffset(offset, 4, this.length); return this.parent.readFloatLE(this.offset + offset, !!noAssert); }; Buffer.prototype.readFloatBE = function(offset, noAssert) { if (!noAssert) checkOffset(offset, 4, this.length); return this.parent.readFloatBE(this.offset + offset, !!noAssert); }; Buffer.prototype.readDoubleLE = function(offset, noAssert) { if (!noAssert) checkOffset(offset, 8, this.length); return this.parent.readDoubleLE(this.offset + offset, !!noAssert); }; Buffer.prototype.readDoubleBE = function(offset, noAssert) { if (!noAssert) checkOffset(offset, 8, this.length); return this.parent.readDoubleBE(this.offset + offset, !!noAssert); }; function checkInt(buffer, value, offset, ext, max, min) { if ((value % 1) !== 0 || value > max || value < min) throw TypeError('value is out of bounds'); if ((offset % 1) !== 0 || offset < 0) throw TypeError('offset is not uint'); if (offset + ext > buffer.length || buffer.length + offset < 0) throw RangeError('Trying to write outside buffer length'); } Buffer.prototype.writeUInt8 = function(value, offset, noAssert) { if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0); this[offset] = value; }; function writeUInt16(buffer, value, offset, isBigEndian) { if (isBigEndian) { buffer[offset] = (value & 0xff00) >>> 8; buffer[offset + 1] = value & 0x00ff; } else { buffer[offset + 1] = (value & 0xff00) >>> 8; buffer[offset] = value & 0x00ff; } } Buffer.prototype.writeUInt16LE = function(value, offset, noAssert) { if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0); writeUInt16(this, value, offset, false); }; Buffer.prototype.writeUInt16BE = function(value, offset, noAssert) { if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0); writeUInt16(this, value, offset, true); }; function writeUInt32(buffer, value, offset, isBigEndian) { if (isBigEndian) { buffer[offset] = (value >>> 24) & 0xff; buffer[offset + 1] = (value >>> 16) & 0xff; buffer[offset + 2] = (value >>> 8) & 0xff; buffer[offset + 3] = value & 0xff; } else { buffer[offset + 3] = (value >>> 24) & 0xff; buffer[offset + 2] = (value >>> 16) & 0xff; buffer[offset + 1] = (value >>> 8) & 0xff; buffer[offset] = value & 0xff; } } Buffer.prototype.writeUInt32LE = function(value, offset, noAssert) { if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0); writeUInt32(this, value, offset, false); }; Buffer.prototype.writeUInt32BE = function(value, offset, noAssert) { if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0); writeUInt32(this, value, offset, true); }; /* * We now move onto our friends in the signed number category. Unlike unsigned * numbers, we're going to have to worry a bit more about how we put values into * arrays. Since we are only worrying about signed 32-bit values, we're in * slightly better shape. Unfortunately, we really can't do our favorite binary * & in this system. It really seems to do the wrong thing. For example: * * > -32 & 0xff * 224 * * What's happening above is really: 0xe0 & 0xff = 0xe0. However, the results of * this aren't treated as a signed number. Ultimately a bad thing. * * What we're going to want to do is basically create the unsigned equivalent of * our representation and pass that off to the wuint* functions. To do that * we're going to do the following: * * - if the value is positive * we can pass it directly off to the equivalent wuint * - if the value is negative * we do the following computation: * mb + val + 1, where * mb is the maximum unsigned value in that byte size * val is the Javascript negative integer * * * As a concrete value, take -128. In signed 16 bits this would be 0xff80. If * you do out the computations: * * 0xffff - 128 + 1 * 0xffff - 127 * 0xff80 * * You can then encode this value as the signed version. This is really rather * hacky, but it should work and get the job done which is our goal here. */ Buffer.prototype.writeInt8 = function(value, offset, noAssert) { if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80); if (value < 0) value = 0xff + value + 1; this[offset] = value; }; Buffer.prototype.writeInt16LE = function(value, offset, noAssert) { if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000); if (value < 0) value = 0xffff + value + 1; writeUInt16(this, value, offset, false); }; Buffer.prototype.writeInt16BE = function(value, offset, noAssert) { if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000); if (value < 0) value = 0xffff + value + 1; writeUInt16(this, value, offset, true); }; Buffer.prototype.writeInt32LE = function(value, offset, noAssert) { if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000); if (value < 0) value = 0xffffffff + value + 1; writeUInt32(this, value, offset, false); }; Buffer.prototype.writeInt32BE = function(value, offset, noAssert) { if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000); if (value < 0) value = 0xffffffff + value + 1; writeUInt32(this, value, offset, true); }; Buffer.prototype.writeFloatLE = function(value, offset, noAssert) { if (!noAssert) checkOffset(offset, 4, this.length); this.parent.writeFloatLE(value, this.offset + offset, !!noAssert); }; Buffer.prototype.writeFloatBE = function(value, offset, noAssert) { if (!noAssert) checkOffset(offset, 4, this.length); this.parent.writeFloatBE(value, this.offset + offset, !!noAssert); }; Buffer.prototype.writeDoubleLE = function(value, offset, noAssert) { if (!noAssert) checkOffset(offset, 8, this.length); this.parent.writeDoubleLE(value, this.offset + offset, !!noAssert); }; Buffer.prototype.writeDoubleBE = function(value, offset, noAssert) { if (!noAssert) checkOffset(offset, 8, this.length); this.parent.writeDoubleBE(value, this.offset + offset, !!noAssert); };