368 lines
13 KiB
JavaScript
368 lines
13 KiB
JavaScript
/*
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bzip2.js - a small bzip2 decompression implementation
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Copyright 2011 by antimatter15 (antimatter15@gmail.com)
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Based on micro-bunzip by Rob Landley (rob@landley.net).
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Copyright (c) 2011 by antimatter15 (antimatter15@gmail.com).
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH
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THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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function Bzip2Error(message) {
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this.name = 'Bzip2Error';
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this.message = message;
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this.stack = (new Error()).stack;
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}
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Bzip2Error.prototype = new Error;
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var message = {
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Error: function(message) {throw new Bzip2Error(message);}
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};
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var bzip2 = {};
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bzip2.Bzip2Error = Bzip2Error;
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bzip2.crcTable =
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[
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0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9,
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0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005,
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0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
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0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd,
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0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9,
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0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
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0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011,
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0x791d4014, 0x7ddc5da3, 0x709f7b7a, 0x745e66cd,
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0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
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0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5,
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0xbe2b5b58, 0xbaea46ef, 0xb7a96036, 0xb3687d81,
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0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
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0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49,
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0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95,
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0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
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0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d,
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0x34867077, 0x30476dc0, 0x3d044b19, 0x39c556ae,
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0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
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0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16,
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0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca,
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0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
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0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02,
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0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1, 0x53dc6066,
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0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
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0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e,
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0xbfa1b04b, 0xbb60adfc, 0xb6238b25, 0xb2e29692,
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0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
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0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a,
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0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e,
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0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
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0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686,
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0xd5b88683, 0xd1799b34, 0xdc3abded, 0xd8fba05a,
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0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
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0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb,
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0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f,
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0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
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0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47,
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0x36194d42, 0x32d850f5, 0x3f9b762c, 0x3b5a6b9b,
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0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
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0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623,
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0xf12f560e, 0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7,
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0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
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0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f,
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0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3,
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0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
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0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b,
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0x9b3660c6, 0x9ff77d71, 0x92b45ba8, 0x9675461f,
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0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
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0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640,
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0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c,
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0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
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0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24,
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0x119b4be9, 0x155a565e, 0x18197087, 0x1cd86d30,
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0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
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0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088,
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0x2497d08d, 0x2056cd3a, 0x2d15ebe3, 0x29d4f654,
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0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
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0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c,
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0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18,
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0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
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0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0,
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0x9abc8bd5, 0x9e7d9662, 0x933eb0bb, 0x97ffad0c,
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0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
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0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
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];
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bzip2.array = function(bytes) {
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var bit = 0, byte = 0;
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var BITMASK = [0, 0x01, 0x03, 0x07, 0x0F, 0x1F, 0x3F, 0x7F, 0xFF ];
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return function(n) {
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var result = 0;
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while(n > 0) {
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var left = 8 - bit;
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if (n >= left) {
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result <<= left;
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result |= (BITMASK[left] & bytes[byte++]);
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bit = 0;
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n -= left;
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} else {
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result <<= n;
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result |= ((bytes[byte] & (BITMASK[n] << (8 - n - bit))) >> (8 - n - bit));
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bit += n;
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n = 0;
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}
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}
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return result;
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}
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}
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bzip2.simple = function(srcbuffer, stream) {
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var bits = bzip2.array(srcbuffer);
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var size = bzip2.header(bits);
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var ret = false;
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var bufsize = 100000 * size;
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var buf = new Int32Array(bufsize);
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do {
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ret = bzip2.decompress(bits, stream, buf, bufsize);
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} while(!ret);
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}
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bzip2.header = function(bits) {
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this.byteCount = new Int32Array(256);
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this.symToByte = new Uint8Array(256);
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this.mtfSymbol = new Int32Array(256);
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this.selectors = new Uint8Array(0x8000);
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if (bits(8*3) != 4348520) message.Error("No magic number found");
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var i = bits(8) - 48;
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if (i < 1 || i > 9) message.Error("Not a BZIP archive");
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return i;
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};
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//takes a function for reading the block data (starting with 0x314159265359)
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//a block size (0-9) (optional, defaults to 9)
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//a length at which to stop decompressing and return the output
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bzip2.decompress = function(bits, stream, buf, bufsize, streamCRC) {
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var MAX_HUFCODE_BITS = 20;
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var MAX_SYMBOLS = 258;
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var SYMBOL_RUNA = 0;
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var SYMBOL_RUNB = 1;
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var GROUP_SIZE = 50;
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var crc = 0 ^ (-1);
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for(var h = '', i = 0; i < 6; i++) h += bits(8).toString(16);
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if (h == "177245385090") {
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var finalCRC = bits(32)|0;
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if (finalCRC !== streamCRC) message.Error("Error in bzip2: crc32 do not match");
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// align stream to byte
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bits(null);
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return null; // reset streamCRC for next call
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}
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if (h != "314159265359") message.Error("eek not valid bzip data");
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var crcblock = bits(32)|0; // CRC code
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if (bits(1)) message.Error("unsupported obsolete version");
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var origPtr = bits(24);
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if (origPtr > bufsize) message.Error("Initial position larger than buffer size");
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var t = bits(16);
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var symTotal = 0;
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for (i = 0; i < 16; i++) {
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if (t & (1 << (15 - i))) {
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var k = bits(16);
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for(j = 0; j < 16; j++) {
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if (k & (1 << (15 - j))) {
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this.symToByte[symTotal++] = (16 * i) + j;
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}
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}
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}
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}
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var groupCount = bits(3);
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if (groupCount < 2 || groupCount > 6) message.Error("another error");
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var nSelectors = bits(15);
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if (nSelectors == 0) message.Error("meh");
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for(var i = 0; i < groupCount; i++) this.mtfSymbol[i] = i;
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for(var i = 0; i < nSelectors; i++) {
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for(var j = 0; bits(1); j++) if (j >= groupCount) message.Error("whoops another error");
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var uc = this.mtfSymbol[j];
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for(var k = j-1; k>=0; k--) {
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this.mtfSymbol[k+1] = this.mtfSymbol[k];
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}
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this.mtfSymbol[0] = uc;
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this.selectors[i] = uc;
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}
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var symCount = symTotal + 2;
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var groups = [];
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var length = new Uint8Array(MAX_SYMBOLS),
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temp = new Uint16Array(MAX_HUFCODE_BITS+1);
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var hufGroup;
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for(var j = 0; j < groupCount; j++) {
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t = bits(5); //lengths
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for(var i = 0; i < symCount; i++) {
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while(true){
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if (t < 1 || t > MAX_HUFCODE_BITS) message.Error("I gave up a while ago on writing error messages");
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if (!bits(1)) break;
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if (!bits(1)) t++;
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else t--;
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}
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length[i] = t;
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}
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var minLen, maxLen;
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minLen = maxLen = length[0];
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for(var i = 1; i < symCount; i++) {
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if (length[i] > maxLen) maxLen = length[i];
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else if (length[i] < minLen) minLen = length[i];
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}
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hufGroup = groups[j] = {};
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hufGroup.permute = new Int32Array(MAX_SYMBOLS);
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hufGroup.limit = new Int32Array(MAX_HUFCODE_BITS + 1);
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hufGroup.base = new Int32Array(MAX_HUFCODE_BITS + 1);
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hufGroup.minLen = minLen;
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hufGroup.maxLen = maxLen;
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var base = hufGroup.base.subarray(1);
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var limit = hufGroup.limit.subarray(1);
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var pp = 0;
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for(var i = minLen; i <= maxLen; i++)
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for(var t = 0; t < symCount; t++)
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if (length[t] == i) hufGroup.permute[pp++] = t;
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for(i = minLen; i <= maxLen; i++) temp[i] = limit[i] = 0;
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for(i = 0; i < symCount; i++) temp[length[i]]++;
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pp = t = 0;
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for(i = minLen; i < maxLen; i++) {
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pp += temp[i];
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limit[i] = pp - 1;
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pp <<= 1;
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base[i+1] = pp - (t += temp[i]);
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}
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limit[maxLen] = pp + temp[maxLen] - 1;
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base[minLen] = 0;
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}
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for(var i = 0; i < 256; i++) {
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this.mtfSymbol[i] = i;
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this.byteCount[i] = 0;
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}
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var runPos, count, symCount, selector;
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runPos = count = symCount = selector = 0;
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while(true) {
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if (!(symCount--)) {
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symCount = GROUP_SIZE - 1;
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if (selector >= nSelectors) message.Error("meow i'm a kitty, that's an error");
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hufGroup = groups[this.selectors[selector++]];
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base = hufGroup.base.subarray(1);
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limit = hufGroup.limit.subarray(1);
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}
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i = hufGroup.minLen;
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j = bits(i);
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while(true) {
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if (i > hufGroup.maxLen) message.Error("rawr i'm a dinosaur");
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if (j <= limit[i]) break;
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i++;
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j = (j << 1) | bits(1);
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}
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j -= base[i];
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if (j < 0 || j >= MAX_SYMBOLS) message.Error("moo i'm a cow");
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var nextSym = hufGroup.permute[j];
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if (nextSym == SYMBOL_RUNA || nextSym == SYMBOL_RUNB) {
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if (!runPos){
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runPos = 1;
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t = 0;
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}
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if (nextSym == SYMBOL_RUNA) t += runPos;
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else t += 2 * runPos;
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runPos <<= 1;
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continue;
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}
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if (runPos) {
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runPos = 0;
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if (count + t > bufsize) message.Error("Boom.");
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uc = this.symToByte[this.mtfSymbol[0]];
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this.byteCount[uc] += t;
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while(t--) buf[count++] = uc;
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}
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if (nextSym > symTotal) break;
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if (count >= bufsize) message.Error("I can't think of anything. Error");
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i = nextSym - 1;
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uc = this.mtfSymbol[i];
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for(var k = i-1; k>=0; k--) {
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this.mtfSymbol[k+1] = this.mtfSymbol[k];
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}
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this.mtfSymbol[0] = uc
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uc = this.symToByte[uc];
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this.byteCount[uc]++;
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buf[count++] = uc;
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}
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if (origPtr < 0 || origPtr >= count) message.Error("I'm a monkey and I'm throwing something at someone, namely you");
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var j = 0;
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for(var i = 0; i < 256; i++) {
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k = j + this.byteCount[i];
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this.byteCount[i] = j;
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j = k;
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}
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for(var i = 0; i < count; i++) {
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uc = buf[i] & 0xff;
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buf[this.byteCount[uc]] |= (i << 8);
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this.byteCount[uc]++;
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}
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var pos = 0, current = 0, run = 0;
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if (count) {
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pos = buf[origPtr];
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current = (pos & 0xff);
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pos >>= 8;
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run = -1;
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}
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count = count;
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var copies, previous, outbyte;
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while(count) {
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count--;
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previous = current;
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pos = buf[pos];
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current = pos & 0xff;
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pos >>= 8;
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if (run++ == 3) {
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copies = current;
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outbyte = previous;
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current = -1;
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} else {
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copies = 1;
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outbyte = current;
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}
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while(copies--) {
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crc = ((crc << 8) ^ this.crcTable[((crc>>24) ^ outbyte) & 0xFF])&0xFFFFFFFF; // crc32
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stream(outbyte);
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}
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if (current != previous) run = 0;
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}
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crc = (crc ^ (-1)) >>> 0;
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if ((crc|0) != (crcblock|0)) message.Error("Error in bzip2: crc32 do not match");
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if (streamCRC === null)
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streamCRC = 0;
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streamCRC = (crc ^ ((streamCRC << 1) | (streamCRC >>> 31))) & 0xFFFFFFFF;
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return streamCRC;
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}
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module.exports = bzip2;
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