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/* 
  bzip2.js - a small bzip2 decompression implementation
  
  Copyright 2011 by antimatter15 (antimatter15@gmail.com)
  
  Based on micro-bunzip by Rob Landley (rob@landley.net).

  Copyright (c) 2011 by antimatter15 (antimatter15@gmail.com).

  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.
*/
function Bzip2Error(message) {
    this.name = 'Bzip2Error';
    this.message = message;
    this.stack = (new Error()).stack;
}
Bzip2Error.prototype = new Error;
 
var message = {
    Error: function(message) {throw new Bzip2Error(message);}
};

var bzip2 = {};
bzip2.Bzip2Error = Bzip2Error;

bzip2.crcTable =
[
   0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9,
   0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005,
   0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
   0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd,
   0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9,
   0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
   0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011,
   0x791d4014, 0x7ddc5da3, 0x709f7b7a, 0x745e66cd,
   0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
   0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5,
   0xbe2b5b58, 0xbaea46ef, 0xb7a96036, 0xb3687d81,
   0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
   0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49,
   0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95,
   0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
   0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d,
   0x34867077, 0x30476dc0, 0x3d044b19, 0x39c556ae,
   0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
   0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16,
   0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca,
   0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
   0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02,
   0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1, 0x53dc6066,
   0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
   0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e,
   0xbfa1b04b, 0xbb60adfc, 0xb6238b25, 0xb2e29692,
   0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
   0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a,
   0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e,
   0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
   0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686,
   0xd5b88683, 0xd1799b34, 0xdc3abded, 0xd8fba05a,
   0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
   0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb,
   0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f,
   0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
   0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47,
   0x36194d42, 0x32d850f5, 0x3f9b762c, 0x3b5a6b9b,
   0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
   0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623,
   0xf12f560e, 0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7,
   0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
   0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f,
   0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3,
   0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
   0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b,
   0x9b3660c6, 0x9ff77d71, 0x92b45ba8, 0x9675461f,
   0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
   0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640,
   0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c,
   0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
   0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24,
   0x119b4be9, 0x155a565e, 0x18197087, 0x1cd86d30,
   0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
   0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088,
   0x2497d08d, 0x2056cd3a, 0x2d15ebe3, 0x29d4f654,
   0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
   0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c,
   0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18,
   0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
   0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0,
   0x9abc8bd5, 0x9e7d9662, 0x933eb0bb, 0x97ffad0c,
   0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
   0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
];

bzip2.array = function(bytes) {
    var bit = 0, byte = 0;
    var BITMASK = [0, 0x01, 0x03, 0x07, 0x0F, 0x1F, 0x3F, 0x7F, 0xFF ];
    return function(n) {
        var result = 0;
        while(n > 0) {
            var left = 8 - bit;
            if (n >= left) {
                result <<= left;
                result |= (BITMASK[left] & bytes[byte++]);
                bit = 0;
                n -= left;
            } else {
                result <<= n;
                result |= ((bytes[byte] & (BITMASK[n] << (8 - n - bit))) >> (8 - n - bit));
                bit += n;
                n = 0;
            }
        }
        return result;
    }
}

    
bzip2.simple = function(srcbuffer, stream) {
    var bits = bzip2.array(srcbuffer);
    var size = bzip2.header(bits);
    var ret = false;
    var bufsize = 100000 * size;
    var buf = new Int32Array(bufsize);
    
    do {
        ret = bzip2.decompress(bits, stream, buf, bufsize);        
    } while(!ret);
}

bzip2.header = function(bits) {
    this.byteCount = new Int32Array(256);
    this.symToByte = new Uint8Array(256);
    this.mtfSymbol = new Int32Array(256);
    this.selectors = new Uint8Array(0x8000);

    if (bits(8*3) != 4348520) message.Error("No magic number found");

    var i = bits(8) - 48;
    if (i < 1 || i > 9) message.Error("Not a BZIP archive");
    return i;
};


//takes a function for reading the block data (starting with 0x314159265359)
//a block size (0-9) (optional, defaults to 9)
//a length at which to stop decompressing and return the output
bzip2.decompress = function(bits, stream, buf, bufsize, streamCRC) {
    var MAX_HUFCODE_BITS = 20;
    var MAX_SYMBOLS = 258;
    var SYMBOL_RUNA = 0;
    var SYMBOL_RUNB = 1;
    var GROUP_SIZE = 50;
    var crc = 0 ^ (-1);
    
    for(var h = '', i = 0; i < 6; i++) h += bits(8).toString(16);
    if (h == "177245385090") {
      var finalCRC = bits(32)|0;
      if (finalCRC !== streamCRC) message.Error("Error in bzip2: crc32 do not match");
      // align stream to byte
      bits(null);
      return null; // reset streamCRC for next call
    }
    if (h != "314159265359") message.Error("eek not valid bzip data");
    var crcblock = bits(32)|0; // CRC code
    if (bits(1)) message.Error("unsupported obsolete version");
    var origPtr = bits(24);
    if (origPtr > bufsize) message.Error("Initial position larger than buffer size");
    var t = bits(16);
    var symTotal = 0;
    for (i = 0; i < 16; i++) {
        if (t & (1 << (15 - i))) {
            var k = bits(16);
            for(j = 0; j < 16; j++) {
                if (k & (1 << (15 - j))) {
                    this.symToByte[symTotal++] = (16 * i) + j;
                }
            }
        }
    }

    var groupCount = bits(3);
    if (groupCount < 2 || groupCount > 6) message.Error("another error");
    var nSelectors = bits(15);
    if (nSelectors == 0) message.Error("meh");
    for(var i = 0; i < groupCount; i++) this.mtfSymbol[i] = i;

    for(var i = 0; i < nSelectors; i++) {
        for(var j = 0; bits(1); j++) if (j >= groupCount) message.Error("whoops another error");
        var uc = this.mtfSymbol[j];
        for(var k = j-1; k>=0; k--) {
            this.mtfSymbol[k+1] = this.mtfSymbol[k];
        }
        this.mtfSymbol[0] = uc;
        this.selectors[i] = uc;
    }

    var symCount = symTotal + 2;
    var groups = [];
    var length = new Uint8Array(MAX_SYMBOLS),
    temp = new Uint16Array(MAX_HUFCODE_BITS+1);

    var hufGroup;

    for(var j = 0; j < groupCount; j++) {
        t = bits(5); //lengths
        for(var i = 0; i < symCount; i++) {
            while(true){
                if (t < 1 || t > MAX_HUFCODE_BITS) message.Error("I gave up a while ago on writing error messages");
                if (!bits(1)) break;
                if (!bits(1)) t++;
                else t--;
            }
            length[i] = t;
        }
        var  minLen,  maxLen;
        minLen = maxLen = length[0];
        for(var i = 1; i < symCount; i++) {
            if (length[i] > maxLen) maxLen = length[i];
            else if (length[i] < minLen) minLen = length[i];
        }
        hufGroup = groups[j] = {};
        hufGroup.permute = new Int32Array(MAX_SYMBOLS);
        hufGroup.limit = new Int32Array(MAX_HUFCODE_BITS + 1);
        hufGroup.base = new Int32Array(MAX_HUFCODE_BITS + 1);

        hufGroup.minLen = minLen;
        hufGroup.maxLen = maxLen;
        var base = hufGroup.base;
        var limit = hufGroup.limit;
        var pp = 0;
        for(var i = minLen; i <= maxLen; i++)
        for(var t = 0; t < symCount; t++)
        if (length[t] == i) hufGroup.permute[pp++] = t;
        for(i = minLen; i <= maxLen; i++) temp[i] = limit[i] = 0;
        for(i = 0; i < symCount; i++) temp[length[i]]++;
        pp = t = 0;
        for(i = minLen; i < maxLen; i++) {
            pp += temp[i];
            limit[i] = pp - 1;
            pp <<= 1;
            base[i+1] = pp - (t += temp[i]);
        }
        limit[maxLen] = pp + temp[maxLen] - 1;
        base[minLen] = 0;
    }

    for(var i = 0; i < 256; i++) { 
        this.mtfSymbol[i] = i;
        this.byteCount[i] = 0;
    }
    var runPos, count, symCount, selector;
    runPos = count = symCount = selector = 0;    
    while(true) {
        if (!(symCount--)) {
            symCount = GROUP_SIZE - 1;
            if (selector >= nSelectors) message.Error("meow i'm a kitty, that's an error");
            hufGroup = groups[this.selectors[selector++]];
            base = hufGroup.base;
            limit = hufGroup.limit;
        }
        i = hufGroup.minLen;
        j = bits(i);
        while(true) {
            if (i > hufGroup.maxLen) message.Error("rawr i'm a dinosaur");
            if (j <= limit[i]) break;
            i++;
            j = (j << 1) | bits(1);
        }
        j -= base[i];
        if (j < 0 || j >= MAX_SYMBOLS) message.Error("moo i'm a cow");
        var nextSym = hufGroup.permute[j];
        if (nextSym == SYMBOL_RUNA || nextSym == SYMBOL_RUNB) {
            if (!runPos){
                runPos = 1;
                t = 0;
            }
            if (nextSym == SYMBOL_RUNA) t += runPos;
            else t += 2 * runPos;
            runPos <<= 1;
            continue;
        }
        if (runPos) {
            runPos = 0;
            if (count + t > bufsize) message.Error("Boom.");
            uc = this.symToByte[this.mtfSymbol[0]];
            this.byteCount[uc] += t;
            while(t--) buf[count++] = uc;
        }
        if (nextSym > symTotal) break;
        if (count >= bufsize) message.Error("I can't think of anything. Error");
        i = nextSym - 1;
        uc = this.mtfSymbol[i];
        for(var k = i-1; k>=0; k--) {
            this.mtfSymbol[k+1] = this.mtfSymbol[k];
        }
        this.mtfSymbol[0] = uc
        uc = this.symToByte[uc];
        this.byteCount[uc]++;
        buf[count++] = uc;
    }
    if (origPtr < 0 || origPtr >= count) message.Error("I'm a monkey and I'm throwing something at someone, namely you");
    var j = 0;
    for(var i = 0; i < 256; i++) {
        k = j + this.byteCount[i];
        this.byteCount[i] = j;
        j = k;
    }
    for(var i = 0; i < count; i++) {
        uc = buf[i] & 0xff;
        buf[this.byteCount[uc]] |= (i << 8);
        this.byteCount[uc]++;
    }
    var pos = 0, current = 0, run = 0;
    if (count) {
        pos = buf[origPtr];
        current = (pos & 0xff);
        pos >>= 8;
        run = -1;
    }
    count = count;
    var copies, previous, outbyte;
    while(count) {
        count--;
        previous = current;
        pos = buf[pos];
        current = pos & 0xff;
        pos >>= 8;
        if (run++ == 3) {
            copies = current;
            outbyte = previous;
            current = -1;
        } else {
            copies = 1;
            outbyte = current;
        }
        while(copies--) {
            crc = ((crc << 8) ^ this.crcTable[((crc>>24) ^ outbyte) & 0xFF])&0xFFFFFFFF; // crc32
            stream(outbyte);
        }
        if (current != previous) run = 0;
    }

    crc = (crc ^ (-1)) >>> 0;
    if ((crc|0) != (crcblock|0)) message.Error("Error in bzip2: crc32 do not match");
    streamCRC = (crc ^ ((streamCRC << 1) | (streamCRC >>> 31))) & 0xFFFFFFFF;
    return streamCRC;
}

module.exports = bzip2;