/* Copyright (c) 2013 Gildas Lormeau. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. The names of the authors may not be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT, INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* * This program is based on JZlib 1.0.2 ymnk, JCraft,Inc. * JZlib is based on zlib-1.1.3, so all credit should go authors * Jean-loup Gailly(jloup@gzip.org) and Mark Adler(madler@alumni.caltech.edu) * and contributors of zlib. */ // Global var MAX_BITS = 15; var Z_OK = 0; var Z_STREAM_END = 1; var Z_NEED_DICT = 2; var Z_STREAM_ERROR = -2; var Z_DATA_ERROR = -3; var Z_MEM_ERROR = -4; var Z_BUF_ERROR = -5; var inflate_mask = [ 0x00000000, 0x00000001, 0x00000003, 0x00000007, 0x0000000f, 0x0000001f, 0x0000003f, 0x0000007f, 0x000000ff, 0x000001ff, 0x000003ff, 0x000007ff, 0x00000fff, 0x00001fff, 0x00003fff, 0x00007fff, 0x0000ffff ]; var MANY = 1440; // JZlib version : "1.0.2" var Z_NO_FLUSH = 0; var Z_FINISH = 4; // InfTree var fixed_bl = 9; var fixed_bd = 5; var fixed_tl = [ 96, 7, 256, 0, 8, 80, 0, 8, 16, 84, 8, 115, 82, 7, 31, 0, 8, 112, 0, 8, 48, 0, 9, 192, 80, 7, 10, 0, 8, 96, 0, 8, 32, 0, 9, 160, 0, 8, 0, 0, 8, 128, 0, 8, 64, 0, 9, 224, 80, 7, 6, 0, 8, 88, 0, 8, 24, 0, 9, 144, 83, 7, 59, 0, 8, 120, 0, 8, 56, 0, 9, 208, 81, 7, 17, 0, 8, 104, 0, 8, 40, 0, 9, 176, 0, 8, 8, 0, 8, 136, 0, 8, 72, 0, 9, 240, 80, 7, 4, 0, 8, 84, 0, 8, 20, 85, 8, 227, 83, 7, 43, 0, 8, 116, 0, 8, 52, 0, 9, 200, 81, 7, 13, 0, 8, 100, 0, 8, 36, 0, 9, 168, 0, 8, 4, 0, 8, 132, 0, 8, 68, 0, 9, 232, 80, 7, 8, 0, 8, 92, 0, 8, 28, 0, 9, 152, 84, 7, 83, 0, 8, 124, 0, 8, 60, 0, 9, 216, 82, 7, 23, 0, 8, 108, 0, 8, 44, 0, 9, 184, 0, 8, 12, 0, 8, 140, 0, 8, 76, 0, 9, 248, 80, 7, 3, 0, 8, 82, 0, 8, 18, 85, 8, 163, 83, 7, 35, 0, 8, 114, 0, 8, 50, 0, 9, 196, 81, 7, 11, 0, 8, 98, 0, 8, 34, 0, 9, 164, 0, 8, 2, 0, 8, 130, 0, 8, 66, 0, 9, 228, 80, 7, 7, 0, 8, 90, 0, 8, 26, 0, 9, 148, 84, 7, 67, 0, 8, 122, 0, 8, 58, 0, 9, 212, 82, 7, 19, 0, 8, 106, 0, 8, 42, 0, 9, 180, 0, 8, 10, 0, 8, 138, 0, 8, 74, 0, 9, 244, 80, 7, 5, 0, 8, 86, 0, 8, 22, 192, 8, 0, 83, 7, 51, 0, 8, 118, 0, 8, 54, 0, 9, 204, 81, 7, 15, 0, 8, 102, 0, 8, 38, 0, 9, 172, 0, 8, 6, 0, 8, 134, 0, 8, 70, 0, 9, 236, 80, 7, 9, 0, 8, 94, 0, 8, 30, 0, 9, 156, 84, 7, 99, 0, 8, 126, 0, 8, 62, 0, 9, 220, 82, 7, 27, 0, 8, 110, 0, 8, 46, 0, 9, 188, 0, 8, 14, 0, 8, 142, 0, 8, 78, 0, 9, 252, 96, 7, 256, 0, 8, 81, 0, 8, 17, 85, 8, 131, 82, 7, 31, 0, 8, 113, 0, 8, 49, 0, 9, 194, 80, 7, 10, 0, 8, 97, 0, 8, 33, 0, 9, 162, 0, 8, 1, 0, 8, 129, 0, 8, 65, 0, 9, 226, 80, 7, 6, 0, 8, 89, 0, 8, 25, 0, 9, 146, 83, 7, 59, 0, 8, 121, 0, 8, 57, 0, 9, 210, 81, 7, 17, 0, 8, 105, 0, 8, 41, 0, 9, 178, 0, 8, 9, 0, 8, 137, 0, 8, 73, 0, 9, 242, 80, 7, 4, 0, 8, 85, 0, 8, 21, 80, 8, 258, 83, 7, 43, 0, 8, 117, 0, 8, 53, 0, 9, 202, 81, 7, 13, 0, 8, 101, 0, 8, 37, 0, 9, 170, 0, 8, 5, 0, 8, 133, 0, 8, 69, 0, 9, 234, 80, 7, 8, 0, 8, 93, 0, 8, 29, 0, 9, 154, 84, 7, 83, 0, 8, 125, 0, 8, 61, 0, 9, 218, 82, 7, 23, 0, 8, 109, 0, 8, 45, 0, 9, 186, 0, 8, 13, 0, 8, 141, 0, 8, 77, 0, 9, 250, 80, 7, 3, 0, 8, 83, 0, 8, 19, 85, 8, 195, 83, 7, 35, 0, 8, 115, 0, 8, 51, 0, 9, 198, 81, 7, 11, 0, 8, 99, 0, 8, 35, 0, 9, 166, 0, 8, 3, 0, 8, 131, 0, 8, 67, 0, 9, 230, 80, 7, 7, 0, 8, 91, 0, 8, 27, 0, 9, 150, 84, 7, 67, 0, 8, 123, 0, 8, 59, 0, 9, 214, 82, 7, 19, 0, 8, 107, 0, 8, 43, 0, 9, 182, 0, 8, 11, 0, 8, 139, 0, 8, 75, 0, 9, 246, 80, 7, 5, 0, 8, 87, 0, 8, 23, 192, 8, 0, 83, 7, 51, 0, 8, 119, 0, 8, 55, 0, 9, 206, 81, 7, 15, 0, 8, 103, 0, 8, 39, 0, 9, 174, 0, 8, 7, 0, 8, 135, 0, 8, 71, 0, 9, 238, 80, 7, 9, 0, 8, 95, 0, 8, 31, 0, 9, 158, 84, 7, 99, 0, 8, 127, 0, 8, 63, 0, 9, 222, 82, 7, 27, 0, 8, 111, 0, 8, 47, 0, 9, 190, 0, 8, 15, 0, 8, 143, 0, 8, 79, 0, 9, 254, 96, 7, 256, 0, 8, 80, 0, 8, 16, 84, 8, 115, 82, 7, 31, 0, 8, 112, 0, 8, 48, 0, 9, 193, 80, 7, 10, 0, 8, 96, 0, 8, 32, 0, 9, 161, 0, 8, 0, 0, 8, 128, 0, 8, 64, 0, 9, 225, 80, 7, 6, 0, 8, 88, 0, 8, 24, 0, 9, 145, 83, 7, 59, 0, 8, 120, 0, 8, 56, 0, 9, 209, 81, 7, 17, 0, 8, 104, 0, 8, 40, 0, 9, 177, 0, 8, 8, 0, 8, 136, 0, 8, 72, 0, 9, 241, 80, 7, 4, 0, 8, 84, 0, 8, 20, 85, 8, 227, 83, 7, 43, 0, 8, 116, 0, 8, 52, 0, 9, 201, 81, 7, 13, 0, 8, 100, 0, 8, 36, 0, 9, 169, 0, 8, 4, 0, 8, 132, 0, 8, 68, 0, 9, 233, 80, 7, 8, 0, 8, 92, 0, 8, 28, 0, 9, 153, 84, 7, 83, 0, 8, 124, 0, 8, 60, 0, 9, 217, 82, 7, 23, 0, 8, 108, 0, 8, 44, 0, 9, 185, 0, 8, 12, 0, 8, 140, 0, 8, 76, 0, 9, 249, 80, 7, 3, 0, 8, 82, 0, 8, 18, 85, 8, 163, 83, 7, 35, 0, 8, 114, 0, 8, 50, 0, 9, 197, 81, 7, 11, 0, 8, 98, 0, 8, 34, 0, 9, 165, 0, 8, 2, 0, 8, 130, 0, 8, 66, 0, 9, 229, 80, 7, 7, 0, 8, 90, 0, 8, 26, 0, 9, 149, 84, 7, 67, 0, 8, 122, 0, 8, 58, 0, 9, 213, 82, 7, 19, 0, 8, 106, 0, 8, 42, 0, 9, 181, 0, 8, 10, 0, 8, 138, 0, 8, 74, 0, 9, 245, 80, 7, 5, 0, 8, 86, 0, 8, 22, 192, 8, 0, 83, 7, 51, 0, 8, 118, 0, 8, 54, 0, 9, 205, 81, 7, 15, 0, 8, 102, 0, 8, 38, 0, 9, 173, 0, 8, 6, 0, 8, 134, 0, 8, 70, 0, 9, 237, 80, 7, 9, 0, 8, 94, 0, 8, 30, 0, 9, 157, 84, 7, 99, 0, 8, 126, 0, 8, 62, 0, 9, 221, 82, 7, 27, 0, 8, 110, 0, 8, 46, 0, 9, 189, 0, 8, 14, 0, 8, 142, 0, 8, 78, 0, 9, 253, 96, 7, 256, 0, 8, 81, 0, 8, 17, 85, 8, 131, 82, 7, 31, 0, 8, 113, 0, 8, 49, 0, 9, 195, 80, 7, 10, 0, 8, 97, 0, 8, 33, 0, 9, 163, 0, 8, 1, 0, 8, 129, 0, 8, 65, 0, 9, 227, 80, 7, 6, 0, 8, 89, 0, 8, 25, 0, 9, 147, 83, 7, 59, 0, 8, 121, 0, 8, 57, 0, 9, 211, 81, 7, 17, 0, 8, 105, 0, 8, 41, 0, 9, 179, 0, 8, 9, 0, 8, 137, 0, 8, 73, 0, 9, 243, 80, 7, 4, 0, 8, 85, 0, 8, 21, 80, 8, 258, 83, 7, 43, 0, 8, 117, 0, 8, 53, 0, 9, 203, 81, 7, 13, 0, 8, 101, 0, 8, 37, 0, 9, 171, 0, 8, 5, 0, 8, 133, 0, 8, 69, 0, 9, 235, 80, 7, 8, 0, 8, 93, 0, 8, 29, 0, 9, 155, 84, 7, 83, 0, 8, 125, 0, 8, 61, 0, 9, 219, 82, 7, 23, 0, 8, 109, 0, 8, 45, 0, 9, 187, 0, 8, 13, 0, 8, 141, 0, 8, 77, 0, 9, 251, 80, 7, 3, 0, 8, 83, 0, 8, 19, 85, 8, 195, 83, 7, 35, 0, 8, 115, 0, 8, 51, 0, 9, 199, 81, 7, 11, 0, 8, 99, 0, 8, 35, 0, 9, 167, 0, 8, 3, 0, 8, 131, 0, 8, 67, 0, 9, 231, 80, 7, 7, 0, 8, 91, 0, 8, 27, 0, 9, 151, 84, 7, 67, 0, 8, 123, 0, 8, 59, 0, 9, 215, 82, 7, 19, 0, 8, 107, 0, 8, 43, 0, 9, 183, 0, 8, 11, 0, 8, 139, 0, 8, 75, 0, 9, 247, 80, 7, 5, 0, 8, 87, 0, 8, 23, 192, 8, 0, 83, 7, 51, 0, 8, 119, 0, 8, 55, 0, 9, 207, 81, 7, 15, 0, 8, 103, 0, 8, 39, 0, 9, 175, 0, 8, 7, 0, 8, 135, 0, 8, 71, 0, 9, 239, 80, 7, 9, 0, 8, 95, 0, 8, 31, 0, 9, 159, 84, 7, 99, 0, 8, 127, 0, 8, 63, 0, 9, 223, 82, 7, 27, 0, 8, 111, 0, 8, 47, 0, 9, 191, 0, 8, 15, 0, 8, 143, 0, 8, 79, 0, 9, 255 ]; var fixed_td = [ 80, 5, 1, 87, 5, 257, 83, 5, 17, 91, 5, 4097, 81, 5, 5, 89, 5, 1025, 85, 5, 65, 93, 5, 16385, 80, 5, 3, 88, 5, 513, 84, 5, 33, 92, 5, 8193, 82, 5, 9, 90, 5, 2049, 86, 5, 129, 192, 5, 24577, 80, 5, 2, 87, 5, 385, 83, 5, 25, 91, 5, 6145, 81, 5, 7, 89, 5, 1537, 85, 5, 97, 93, 5, 24577, 80, 5, 4, 88, 5, 769, 84, 5, 49, 92, 5, 12289, 82, 5, 13, 90, 5, 3073, 86, 5, 193, 192, 5, 24577 ]; // Tables for deflate from PKZIP's appnote.txt. var cplens = [ // Copy lengths for literal codes 257..285 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0 ]; // see note #13 above about 258 var cplext = [ // Extra bits for literal codes 257..285 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 112, 112 // 112==invalid ]; var cpdist = [ // Copy offsets for distance codes 0..29 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577 ]; var cpdext = [ // Extra bits for distance codes 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13 ]; // If BMAX needs to be larger than 16, then h and x[] should be uLong. var BMAX = 15; // maximum bit length of any code function InfTree() { var that = this; var hn; // hufts used in space var v; // work area for huft_build var c; // bit length count table var r; // table entry for structure assignment var u; // table stack var x; // bit offsets, then code stack function huft_build(b, // code lengths in bits (all assumed <= // BMAX) bindex, n, // number of codes (assumed <= 288) s, // number of simple-valued codes (0..s-1) d, // list of base values for non-simple codes e, // list of extra bits for non-simple codes t, // result: starting table m, // maximum lookup bits, returns actual hp,// space for trees hn,// hufts used in space v // working area: values in order of bit length ) { // Given a list of code lengths and a maximum table size, make a set of // tables to decode that set of codes. Return Z_OK on success, // Z_BUF_ERROR // if the given code set is incomplete (the tables are still built in // this // case), Z_DATA_ERROR if the input is invalid (an over-subscribed set // of // lengths), or Z_MEM_ERROR if not enough memory. var a; // counter for codes of length k var f; // i repeats in table every f entries var g; // maximum code length var h; // table level var i; // counter, current code var j; // counter var k; // number of bits in current code var l; // bits per table (returned in m) var mask; // (1 << w) - 1, to avoid cc -O bug on HP var p; // pointer into c[], b[], or v[] var q; // points to current table var w; // bits before this table == (l * h) var xp; // pointer into x var y; // number of dummy codes added var z; // number of entries in current table // Generate counts for each bit length p = 0; i = n; do { c[b[bindex + p]]++; p++; i--; // assume all entries <= BMAX } while (i !== 0); if (c[0] == n) { // null input--all zero length codes t[0] = -1; m[0] = 0; return Z_OK; } // Find minimum and maximum length, bound *m by those l = m[0]; for (j = 1; j <= BMAX; j++) if (c[j] !== 0) break; k = j; // minimum code length if (l < j) { l = j; } for (i = BMAX; i !== 0; i--) { if (c[i] !== 0) break; } g = i; // maximum code length if (l > i) { l = i; } m[0] = l; // Adjust last length count to fill out codes, if needed for (y = 1 << j; j < i; j++, y <<= 1) { if ((y -= c[j]) < 0) { return Z_DATA_ERROR; } } if ((y -= c[i]) < 0) { return Z_DATA_ERROR; } c[i] += y; // Generate starting offsets into the value table for each length x[1] = j = 0; p = 1; xp = 2; while (--i !== 0) { // note that i == g from above x[xp] = (j += c[p]); xp++; p++; } // Make a table of values in order of bit lengths i = 0; p = 0; do { if ((j = b[bindex + p]) !== 0) { v[x[j]++] = i; } p++; } while (++i < n); n = x[g]; // set n to length of v // Generate the Huffman codes and for each, make the table entries x[0] = i = 0; // first Huffman code is zero p = 0; // grab values in bit order h = -1; // no tables yet--level -1 w = -l; // bits decoded == (l * h) u[0] = 0; // just to keep compilers happy q = 0; // ditto z = 0; // ditto // go through the bit lengths (k already is bits in shortest code) for (; k <= g; k++) { a = c[k]; while (a-- !== 0) { // here i is the Huffman code of length k bits for value *p // make tables up to required level while (k > w + l) { h++; w += l; // previous table always l bits // compute minimum size table less than or equal to l bits z = g - w; z = (z > l) ? l : z; // table size upper limit if ((f = 1 << (j = k - w)) > a + 1) { // try a k-w bit table // too few codes for // k-w bit table f -= a + 1; // deduct codes from patterns left xp = k; if (j < z) { while (++j < z) { // try smaller tables up to z bits if ((f <<= 1) <= c[++xp]) break; // enough codes to use up j bits f -= c[xp]; // else deduct codes from patterns } } } z = 1 << j; // table entries for j-bit table // allocate new table if (hn[0] + z > MANY) { // (note: doesn't matter for fixed) return Z_DATA_ERROR; // overflow of MANY } u[h] = q = /* hp+ */hn[0]; // DEBUG hn[0] += z; // connect to last table, if there is one if (h !== 0) { x[h] = i; // save pattern for backing up r[0] = /* (byte) */j; // bits in this table r[1] = /* (byte) */l; // bits to dump before this table j = i >>> (w - l); r[2] = /* (int) */(q - u[h - 1] - j); // offset to this table hp.set(r, (u[h - 1] + j) * 3); // to // last // table } else { t[0] = q; // first table is returned result } } // set up table entry in r r[1] = /* (byte) */(k - w); if (p >= n) { r[0] = 128 + 64; // out of values--invalid code } else if (v[p] < s) { r[0] = /* (byte) */(v[p] < 256 ? 0 : 32 + 64); // 256 is // end-of-block r[2] = v[p++]; // simple code is just the value } else { r[0] = /* (byte) */(e[v[p] - s] + 16 + 64); // non-simple--look // up in lists r[2] = d[v[p++] - s]; } // fill code-like entries with r f = 1 << (k - w); for (j = i >>> w; j < z; j += f) { hp.set(r, (q + j) * 3); } // backwards increment the k-bit code i for (j = 1 << (k - 1); (i & j) !== 0; j >>>= 1) { i ^= j; } i ^= j; // backup over finished tables mask = (1 << w) - 1; // needed on HP, cc -O bug while ((i & mask) != x[h]) { h--; // don't need to update q w -= l; mask = (1 << w) - 1; } } } // Return Z_BUF_ERROR if we were given an incomplete table return y !== 0 && g != 1 ? Z_BUF_ERROR : Z_OK; } function initWorkArea(vsize) { var i; if (!hn) { hn = []; // []; //new Array(1); v = []; // new Array(vsize); c = new Int32Array(BMAX + 1); // new Array(BMAX + 1); r = []; // new Array(3); u = new Int32Array(BMAX); // new Array(BMAX); x = new Int32Array(BMAX + 1); // new Array(BMAX + 1); } if (v.length < vsize) { v = []; // new Array(vsize); } for (i = 0; i < vsize; i++) { v[i] = 0; } for (i = 0; i < BMAX + 1; i++) { c[i] = 0; } for (i = 0; i < 3; i++) { r[i] = 0; } // for(int i=0; i 257)) { if (result == Z_DATA_ERROR) { z.msg = "oversubscribed distance tree"; } else if (result == Z_BUF_ERROR) { z.msg = "incomplete distance tree"; result = Z_DATA_ERROR; } else if (result != Z_MEM_ERROR) { z.msg = "empty distance tree with lengths"; result = Z_DATA_ERROR; } return result; } return Z_OK; }; } InfTree.inflate_trees_fixed = function(bl, // literal desired/actual bit depth bd, // distance desired/actual bit depth tl,// literal/length tree result td// distance tree result ) { bl[0] = fixed_bl; bd[0] = fixed_bd; tl[0] = fixed_tl; td[0] = fixed_td; return Z_OK; }; // InfCodes // waiting for "i:"=input, // "o:"=output, // "x:"=nothing var START = 0; // x: set up for LEN var LEN = 1; // i: get length/literal/eob next var LENEXT = 2; // i: getting length extra (have base) var DIST = 3; // i: get distance next var DISTEXT = 4;// i: getting distance extra var COPY = 5; // o: copying bytes in window, waiting // for space var LIT = 6; // o: got literal, waiting for output // space var WASH = 7; // o: got eob, possibly still output // waiting var END = 8; // x: got eob and all data flushed var BADCODE = 9;// x: got error function InfCodes() { var that = this; var mode; // current inflate_codes mode // mode dependent information var len = 0; var tree; // pointer into tree var tree_index = 0; var need = 0; // bits needed var lit = 0; // if EXT or COPY, where and how much var get = 0; // bits to get for extra var dist = 0; // distance back to copy from var lbits = 0; // ltree bits decoded per branch var dbits = 0; // dtree bits decoder per branch var ltree; // literal/length/eob tree var ltree_index = 0; // literal/length/eob tree var dtree; // distance tree var dtree_index = 0; // distance tree // Called with number of bytes left to write in window at least 258 // (the maximum string length) and number of input bytes available // at least ten. The ten bytes are six bytes for the longest length/ // distance pair plus four bytes for overloading the bit buffer. function inflate_fast(bl, bd, tl, tl_index, td, td_index, s, z) { var t; // temporary pointer var tp; // temporary pointer var tp_index; // temporary pointer var e; // extra bits or operation var b; // bit buffer var k; // bits in bit buffer var p; // input data pointer var n; // bytes available there var q; // output window write pointer var m; // bytes to end of window or read pointer var ml; // mask for literal/length tree var md; // mask for distance tree var c; // bytes to copy var d; // distance back to copy from var r; // copy source pointer var tp_index_t_3; // (tp_index+t)*3 // load input, output, bit values p = z.next_in_index; n = z.avail_in; b = s.bitb; k = s.bitk; q = s.write; m = q < s.read ? s.read - q - 1 : s.end - q; // initialize masks ml = inflate_mask[bl]; md = inflate_mask[bd]; // do until not enough input or output space for fast loop do { // assume called with m >= 258 && n >= 10 // get literal/length code while (k < (20)) { // max bits for literal/length code n--; b |= (z.read_byte(p++) & 0xff) << k; k += 8; } t = b & ml; tp = tl; tp_index = tl_index; tp_index_t_3 = (tp_index + t) * 3; if ((e = tp[tp_index_t_3]) === 0) { b >>= (tp[tp_index_t_3 + 1]); k -= (tp[tp_index_t_3 + 1]); s.window[q++] = /* (byte) */tp[tp_index_t_3 + 2]; m--; continue; } do { b >>= (tp[tp_index_t_3 + 1]); k -= (tp[tp_index_t_3 + 1]); if ((e & 16) !== 0) { e &= 15; c = tp[tp_index_t_3 + 2] + (/* (int) */b & inflate_mask[e]); b >>= e; k -= e; // decode distance base of block to copy while (k < (15)) { // max bits for distance code n--; b |= (z.read_byte(p++) & 0xff) << k; k += 8; } t = b & md; tp = td; tp_index = td_index; tp_index_t_3 = (tp_index + t) * 3; e = tp[tp_index_t_3]; do { b >>= (tp[tp_index_t_3 + 1]); k -= (tp[tp_index_t_3 + 1]); if ((e & 16) !== 0) { // get extra bits to add to distance base e &= 15; while (k < (e)) { // get extra bits (up to 13) n--; b |= (z.read_byte(p++) & 0xff) << k; k += 8; } d = tp[tp_index_t_3 + 2] + (b & inflate_mask[e]); b >>= (e); k -= (e); // do the copy m -= c; if (q >= d) { // offset before dest // just copy r = q - d; if (q - r > 0 && 2 > (q - r)) { s.window[q++] = s.window[r++]; // minimum // count is // three, s.window[q++] = s.window[r++]; // so unroll // loop a // little c -= 2; } else { s.window.set(s.window.subarray(r, r + 2), q); q += 2; r += 2; c -= 2; } } else { // else offset after destination r = q - d; do { r += s.end; // force pointer in window } while (r < 0); // covers invalid distances e = s.end - r; if (c > e) { // if source crosses, c -= e; // wrapped copy if (q - r > 0 && e > (q - r)) { do { s.window[q++] = s.window[r++]; } while (--e !== 0); } else { s.window.set(s.window.subarray(r, r + e), q); q += e; r += e; e = 0; } r = 0; // copy rest from start of window } } // copy all or what's left if (q - r > 0 && c > (q - r)) { do { s.window[q++] = s.window[r++]; } while (--c !== 0); } else { s.window.set(s.window.subarray(r, r + c), q); q += c; r += c; c = 0; } break; } else if ((e & 64) === 0) { t += tp[tp_index_t_3 + 2]; t += (b & inflate_mask[e]); tp_index_t_3 = (tp_index + t) * 3; e = tp[tp_index_t_3]; } else { z.msg = "invalid distance code"; c = z.avail_in - n; c = (k >> 3) < c ? k >> 3 : c; n += c; p -= c; k -= c << 3; s.bitb = b; s.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; s.write = q; return Z_DATA_ERROR; } } while (true); break; } if ((e & 64) === 0) { t += tp[tp_index_t_3 + 2]; t += (b & inflate_mask[e]); tp_index_t_3 = (tp_index + t) * 3; if ((e = tp[tp_index_t_3]) === 0) { b >>= (tp[tp_index_t_3 + 1]); k -= (tp[tp_index_t_3 + 1]); s.window[q++] = /* (byte) */tp[tp_index_t_3 + 2]; m--; break; } } else if ((e & 32) !== 0) { c = z.avail_in - n; c = (k >> 3) < c ? k >> 3 : c; n += c; p -= c; k -= c << 3; s.bitb = b; s.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; s.write = q; return Z_STREAM_END; } else { z.msg = "invalid literal/length code"; c = z.avail_in - n; c = (k >> 3) < c ? k >> 3 : c; n += c; p -= c; k -= c << 3; s.bitb = b; s.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; s.write = q; return Z_DATA_ERROR; } } while (true); } while (m >= 258 && n >= 10); // not enough input or output--restore pointers and return c = z.avail_in - n; c = (k >> 3) < c ? k >> 3 : c; n += c; p -= c; k -= c << 3; s.bitb = b; s.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; s.write = q; return Z_OK; } that.init = function(bl, bd, tl, tl_index, td, td_index) { mode = START; lbits = /* (byte) */bl; dbits = /* (byte) */bd; ltree = tl; ltree_index = tl_index; dtree = td; dtree_index = td_index; tree = null; }; that.proc = function(s, z, r) { var j; // temporary storage var tindex; // temporary pointer var e; // extra bits or operation var b = 0; // bit buffer var k = 0; // bits in bit buffer var p = 0; // input data pointer var n; // bytes available there var q; // output window write pointer var m; // bytes to end of window or read pointer var f; // pointer to copy strings from // copy input/output information to locals (UPDATE macro restores) p = z.next_in_index; n = z.avail_in; b = s.bitb; k = s.bitk; q = s.write; m = q < s.read ? s.read - q - 1 : s.end - q; // process input and output based on current state while (true) { switch (mode) { // waiting for "i:"=input, "o:"=output, "x:"=nothing case START: // x: set up for LEN if (m >= 258 && n >= 10) { s.bitb = b; s.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; s.write = q; r = inflate_fast(lbits, dbits, ltree, ltree_index, dtree, dtree_index, s, z); p = z.next_in_index; n = z.avail_in; b = s.bitb; k = s.bitk; q = s.write; m = q < s.read ? s.read - q - 1 : s.end - q; if (r != Z_OK) { mode = r == Z_STREAM_END ? WASH : BADCODE; break; } } need = lbits; tree = ltree; tree_index = ltree_index; mode = LEN; /* falls through */ case LEN: // i: get length/literal/eob next j = need; while (k < (j)) { if (n !== 0) r = Z_OK; else { s.bitb = b; s.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; s.write = q; return s.inflate_flush(z, r); } n--; b |= (z.read_byte(p++) & 0xff) << k; k += 8; } tindex = (tree_index + (b & inflate_mask[j])) * 3; b >>>= (tree[tindex + 1]); k -= (tree[tindex + 1]); e = tree[tindex]; if (e === 0) { // literal lit = tree[tindex + 2]; mode = LIT; break; } if ((e & 16) !== 0) { // length get = e & 15; len = tree[tindex + 2]; mode = LENEXT; break; } if ((e & 64) === 0) { // next table need = e; tree_index = tindex / 3 + tree[tindex + 2]; break; } if ((e & 32) !== 0) { // end of block mode = WASH; break; } mode = BADCODE; // invalid code z.msg = "invalid literal/length code"; r = Z_DATA_ERROR; s.bitb = b; s.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; s.write = q; return s.inflate_flush(z, r); case LENEXT: // i: getting length extra (have base) j = get; while (k < (j)) { if (n !== 0) r = Z_OK; else { s.bitb = b; s.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; s.write = q; return s.inflate_flush(z, r); } n--; b |= (z.read_byte(p++) & 0xff) << k; k += 8; } len += (b & inflate_mask[j]); b >>= j; k -= j; need = dbits; tree = dtree; tree_index = dtree_index; mode = DIST; /* falls through */ case DIST: // i: get distance next j = need; while (k < (j)) { if (n !== 0) r = Z_OK; else { s.bitb = b; s.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; s.write = q; return s.inflate_flush(z, r); } n--; b |= (z.read_byte(p++) & 0xff) << k; k += 8; } tindex = (tree_index + (b & inflate_mask[j])) * 3; b >>= tree[tindex + 1]; k -= tree[tindex + 1]; e = (tree[tindex]); if ((e & 16) !== 0) { // distance get = e & 15; dist = tree[tindex + 2]; mode = DISTEXT; break; } if ((e & 64) === 0) { // next table need = e; tree_index = tindex / 3 + tree[tindex + 2]; break; } mode = BADCODE; // invalid code z.msg = "invalid distance code"; r = Z_DATA_ERROR; s.bitb = b; s.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; s.write = q; return s.inflate_flush(z, r); case DISTEXT: // i: getting distance extra j = get; while (k < (j)) { if (n !== 0) r = Z_OK; else { s.bitb = b; s.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; s.write = q; return s.inflate_flush(z, r); } n--; b |= (z.read_byte(p++) & 0xff) << k; k += 8; } dist += (b & inflate_mask[j]); b >>= j; k -= j; mode = COPY; /* falls through */ case COPY: // o: copying bytes in window, waiting for space f = q - dist; while (f < 0) { // modulo window size-"while" instead f += s.end; // of "if" handles invalid distances } while (len !== 0) { if (m === 0) { if (q == s.end && s.read !== 0) { q = 0; m = q < s.read ? s.read - q - 1 : s.end - q; } if (m === 0) { s.write = q; r = s.inflate_flush(z, r); q = s.write; m = q < s.read ? s.read - q - 1 : s.end - q; if (q == s.end && s.read !== 0) { q = 0; m = q < s.read ? s.read - q - 1 : s.end - q; } if (m === 0) { s.bitb = b; s.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; s.write = q; return s.inflate_flush(z, r); } } } s.window[q++] = s.window[f++]; m--; if (f == s.end) f = 0; len--; } mode = START; break; case LIT: // o: got literal, waiting for output space if (m === 0) { if (q == s.end && s.read !== 0) { q = 0; m = q < s.read ? s.read - q - 1 : s.end - q; } if (m === 0) { s.write = q; r = s.inflate_flush(z, r); q = s.write; m = q < s.read ? s.read - q - 1 : s.end - q; if (q == s.end && s.read !== 0) { q = 0; m = q < s.read ? s.read - q - 1 : s.end - q; } if (m === 0) { s.bitb = b; s.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; s.write = q; return s.inflate_flush(z, r); } } } r = Z_OK; s.window[q++] = /* (byte) */lit; m--; mode = START; break; case WASH: // o: got eob, possibly more output if (k > 7) { // return unused byte, if any k -= 8; n++; p--; // can always return one } s.write = q; r = s.inflate_flush(z, r); q = s.write; m = q < s.read ? s.read - q - 1 : s.end - q; if (s.read != s.write) { s.bitb = b; s.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; s.write = q; return s.inflate_flush(z, r); } mode = END; /* falls through */ case END: r = Z_STREAM_END; s.bitb = b; s.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; s.write = q; return s.inflate_flush(z, r); case BADCODE: // x: got error r = Z_DATA_ERROR; s.bitb = b; s.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; s.write = q; return s.inflate_flush(z, r); default: r = Z_STREAM_ERROR; s.bitb = b; s.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; s.write = q; return s.inflate_flush(z, r); } } }; that.free = function() { // ZFREE(z, c); }; } // InfBlocks // Table for deflate from PKZIP's appnote.txt. var border = [ // Order of the bit length code lengths 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 ]; var TYPE = 0; // get type bits (3, including end bit) var LENS = 1; // get lengths for stored var STORED = 2;// processing stored block var TABLE = 3; // get table lengths var BTREE = 4; // get bit lengths tree for a dynamic // block var DTREE = 5; // get length, distance trees for a // dynamic block var CODES = 6; // processing fixed or dynamic block var DRY = 7; // output remaining window bytes var DONELOCKS = 8; // finished last block, done var BADBLOCKS = 9; // ot a data error--stuck here function InfBlocks(z, w) { var that = this; var mode = TYPE; // current inflate_block mode var left = 0; // if STORED, bytes left to copy var table = 0; // table lengths (14 bits) var index = 0; // index into blens (or border) var blens; // bit lengths of codes var bb = [ 0 ]; // bit length tree depth var tb = [ 0 ]; // bit length decoding tree var codes = new InfCodes(); // if CODES, current state var last = 0; // true if this block is the last block var hufts = new Int32Array(MANY * 3); // single malloc for tree space var check = 0; // check on output var inftree = new InfTree(); that.bitk = 0; // bits in bit buffer that.bitb = 0; // bit buffer that.window = new Uint8Array(w); // sliding window that.end = w; // one byte after sliding window that.read = 0; // window read pointer that.write = 0; // window write pointer that.reset = function(z, c) { if (c) c[0] = check; // if (mode == BTREE || mode == DTREE) { // } if (mode == CODES) { codes.free(z); } mode = TYPE; that.bitk = 0; that.bitb = 0; that.read = that.write = 0; }; that.reset(z, null); // copy as much as possible from the sliding window to the output area that.inflate_flush = function(z, r) { var n; var p; var q; // local copies of source and destination pointers p = z.next_out_index; q = that.read; // compute number of bytes to copy as far as end of window n = /* (int) */((q <= that.write ? that.write : that.end) - q); if (n > z.avail_out) n = z.avail_out; if (n !== 0 && r == Z_BUF_ERROR) r = Z_OK; // update counters z.avail_out -= n; z.total_out += n; // copy as far as end of window z.next_out.set(that.window.subarray(q, q + n), p); p += n; q += n; // see if more to copy at beginning of window if (q == that.end) { // wrap pointers q = 0; if (that.write == that.end) that.write = 0; // compute bytes to copy n = that.write - q; if (n > z.avail_out) n = z.avail_out; if (n !== 0 && r == Z_BUF_ERROR) r = Z_OK; // update counters z.avail_out -= n; z.total_out += n; // copy z.next_out.set(that.window.subarray(q, q + n), p); p += n; q += n; } // update pointers z.next_out_index = p; that.read = q; // done return r; }; that.proc = function(z, r) { var t; // temporary storage var b; // bit buffer var k; // bits in bit buffer var p; // input data pointer var n; // bytes available there var q; // output window write pointer var m; // bytes to end of window or read pointer var i; // copy input/output information to locals (UPDATE macro restores) // { p = z.next_in_index; n = z.avail_in; b = that.bitb; k = that.bitk; // } // { q = that.write; m = /* (int) */(q < that.read ? that.read - q - 1 : that.end - q); // } // process input based on current state // DEBUG dtree while (true) { switch (mode) { case TYPE: while (k < (3)) { if (n !== 0) { r = Z_OK; } else { that.bitb = b; that.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; that.write = q; return that.inflate_flush(z, r); } n--; b |= (z.read_byte(p++) & 0xff) << k; k += 8; } t = /* (int) */(b & 7); last = t & 1; switch (t >>> 1) { case 0: // stored // { b >>>= (3); k -= (3); // } t = k & 7; // go to byte boundary // { b >>>= (t); k -= (t); // } mode = LENS; // get length of stored block break; case 1: // fixed // { var bl = []; // new Array(1); var bd = []; // new Array(1); var tl = [ [] ]; // new Array(1); var td = [ [] ]; // new Array(1); InfTree.inflate_trees_fixed(bl, bd, tl, td); codes.init(bl[0], bd[0], tl[0], 0, td[0], 0); // } // { b >>>= (3); k -= (3); // } mode = CODES; break; case 2: // dynamic // { b >>>= (3); k -= (3); // } mode = TABLE; break; case 3: // illegal // { b >>>= (3); k -= (3); // } mode = BADBLOCKS; z.msg = "invalid block type"; r = Z_DATA_ERROR; that.bitb = b; that.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; that.write = q; return that.inflate_flush(z, r); } break; case LENS: while (k < (32)) { if (n !== 0) { r = Z_OK; } else { that.bitb = b; that.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; that.write = q; return that.inflate_flush(z, r); } n--; b |= (z.read_byte(p++) & 0xff) << k; k += 8; } if ((((~b) >>> 16) & 0xffff) != (b & 0xffff)) { mode = BADBLOCKS; z.msg = "invalid stored block lengths"; r = Z_DATA_ERROR; that.bitb = b; that.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; that.write = q; return that.inflate_flush(z, r); } left = (b & 0xffff); b = k = 0; // dump bits mode = left !== 0 ? STORED : (last !== 0 ? DRY : TYPE); break; case STORED: if (n === 0) { that.bitb = b; that.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; that.write = q; return that.inflate_flush(z, r); } if (m === 0) { if (q == that.end && that.read !== 0) { q = 0; m = /* (int) */(q < that.read ? that.read - q - 1 : that.end - q); } if (m === 0) { that.write = q; r = that.inflate_flush(z, r); q = that.write; m = /* (int) */(q < that.read ? that.read - q - 1 : that.end - q); if (q == that.end && that.read !== 0) { q = 0; m = /* (int) */(q < that.read ? that.read - q - 1 : that.end - q); } if (m === 0) { that.bitb = b; that.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; that.write = q; return that.inflate_flush(z, r); } } } r = Z_OK; t = left; if (t > n) t = n; if (t > m) t = m; that.window.set(z.read_buf(p, t), q); p += t; n -= t; q += t; m -= t; if ((left -= t) !== 0) break; mode = last !== 0 ? DRY : TYPE; break; case TABLE: while (k < (14)) { if (n !== 0) { r = Z_OK; } else { that.bitb = b; that.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; that.write = q; return that.inflate_flush(z, r); } n--; b |= (z.read_byte(p++) & 0xff) << k; k += 8; } table = t = (b & 0x3fff); if ((t & 0x1f) > 29 || ((t >> 5) & 0x1f) > 29) { mode = BADBLOCKS; z.msg = "too many length or distance symbols"; r = Z_DATA_ERROR; that.bitb = b; that.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; that.write = q; return that.inflate_flush(z, r); } t = 258 + (t & 0x1f) + ((t >> 5) & 0x1f); if (!blens || blens.length < t) { blens = []; // new Array(t); } else { for (i = 0; i < t; i++) { blens[i] = 0; } } // { b >>>= (14); k -= (14); // } index = 0; mode = BTREE; /* falls through */ case BTREE: while (index < 4 + (table >>> 10)) { while (k < (3)) { if (n !== 0) { r = Z_OK; } else { that.bitb = b; that.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; that.write = q; return that.inflate_flush(z, r); } n--; b |= (z.read_byte(p++) & 0xff) << k; k += 8; } blens[border[index++]] = b & 7; // { b >>>= (3); k -= (3); // } } while (index < 19) { blens[border[index++]] = 0; } bb[0] = 7; t = inftree.inflate_trees_bits(blens, bb, tb, hufts, z); if (t != Z_OK) { r = t; if (r == Z_DATA_ERROR) { blens = null; mode = BADBLOCKS; } that.bitb = b; that.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; that.write = q; return that.inflate_flush(z, r); } index = 0; mode = DTREE; /* falls through */ case DTREE: while (true) { t = table; if (index >= 258 + (t & 0x1f) + ((t >> 5) & 0x1f)) { break; } var j, c; t = bb[0]; while (k < (t)) { if (n !== 0) { r = Z_OK; } else { that.bitb = b; that.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; that.write = q; return that.inflate_flush(z, r); } n--; b |= (z.read_byte(p++) & 0xff) << k; k += 8; } // if (tb[0] == -1) { // System.err.println("null..."); // } t = hufts[(tb[0] + (b & inflate_mask[t])) * 3 + 1]; c = hufts[(tb[0] + (b & inflate_mask[t])) * 3 + 2]; if (c < 16) { b >>>= (t); k -= (t); blens[index++] = c; } else { // c == 16..18 i = c == 18 ? 7 : c - 14; j = c == 18 ? 11 : 3; while (k < (t + i)) { if (n !== 0) { r = Z_OK; } else { that.bitb = b; that.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; that.write = q; return that.inflate_flush(z, r); } n--; b |= (z.read_byte(p++) & 0xff) << k; k += 8; } b >>>= (t); k -= (t); j += (b & inflate_mask[i]); b >>>= (i); k -= (i); i = index; t = table; if (i + j > 258 + (t & 0x1f) + ((t >> 5) & 0x1f) || (c == 16 && i < 1)) { blens = null; mode = BADBLOCKS; z.msg = "invalid bit length repeat"; r = Z_DATA_ERROR; that.bitb = b; that.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; that.write = q; return that.inflate_flush(z, r); } c = c == 16 ? blens[i - 1] : 0; do { blens[i++] = c; } while (--j !== 0); index = i; } } tb[0] = -1; // { var bl_ = []; // new Array(1); var bd_ = []; // new Array(1); var tl_ = []; // new Array(1); var td_ = []; // new Array(1); bl_[0] = 9; // must be <= 9 for lookahead assumptions bd_[0] = 6; // must be <= 9 for lookahead assumptions t = table; t = inftree.inflate_trees_dynamic(257 + (t & 0x1f), 1 + ((t >> 5) & 0x1f), blens, bl_, bd_, tl_, td_, hufts, z); if (t != Z_OK) { if (t == Z_DATA_ERROR) { blens = null; mode = BADBLOCKS; } r = t; that.bitb = b; that.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; that.write = q; return that.inflate_flush(z, r); } codes.init(bl_[0], bd_[0], hufts, tl_[0], hufts, td_[0]); // } mode = CODES; /* falls through */ case CODES: that.bitb = b; that.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; that.write = q; if ((r = codes.proc(that, z, r)) != Z_STREAM_END) { return that.inflate_flush(z, r); } r = Z_OK; codes.free(z); p = z.next_in_index; n = z.avail_in; b = that.bitb; k = that.bitk; q = that.write; m = /* (int) */(q < that.read ? that.read - q - 1 : that.end - q); if (last === 0) { mode = TYPE; break; } mode = DRY; /* falls through */ case DRY: that.write = q; r = that.inflate_flush(z, r); q = that.write; m = /* (int) */(q < that.read ? that.read - q - 1 : that.end - q); if (that.read != that.write) { that.bitb = b; that.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; that.write = q; return that.inflate_flush(z, r); } mode = DONELOCKS; /* falls through */ case DONELOCKS: r = Z_STREAM_END; that.bitb = b; that.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; that.write = q; return that.inflate_flush(z, r); case BADBLOCKS: r = Z_DATA_ERROR; that.bitb = b; that.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; that.write = q; return that.inflate_flush(z, r); default: r = Z_STREAM_ERROR; that.bitb = b; that.bitk = k; z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p; that.write = q; return that.inflate_flush(z, r); } } }; that.free = function(z) { that.reset(z, null); that.window = null; hufts = null; // ZFREE(z, s); }; that.set_dictionary = function(d, start, n) { that.window.set(d.subarray(start, start + n), 0); that.read = that.write = n; }; // Returns true if inflate is currently at the end of a block generated // by Z_SYNC_FLUSH or Z_FULL_FLUSH. that.sync_point = function() { return mode == LENS ? 1 : 0; }; } // Inflate // preset dictionary flag in zlib header var PRESET_DICT = 0x20; var Z_DEFLATED = 8; var METHOD = 0; // waiting for method byte var FLAG = 1; // waiting for flag byte var DICT4 = 2; // four dictionary check bytes to go var DICT3 = 3; // three dictionary check bytes to go var DICT2 = 4; // two dictionary check bytes to go var DICT1 = 5; // one dictionary check byte to go var DICT0 = 6; // waiting for inflateSetDictionary var BLOCKS = 7; // decompressing blocks var DONE = 12; // finished check, done var BAD = 13; // got an error--stay here var mark = [ 0, 0, 0xff, 0xff ]; function Inflate() { var that = this; that.mode = 0; // current inflate mode // mode dependent information that.method = 0; // if FLAGS, method byte // if CHECK, check values to compare that.was = [ 0 ]; // new Array(1); // computed check value that.need = 0; // stream check value // if BAD, inflateSync's marker bytes count that.marker = 0; // mode independent information that.wbits = 0; // log2(window size) (8..15, defaults to 15) // this.blocks; // current inflate_blocks state function inflateReset(z) { if (!z || !z.istate) return Z_STREAM_ERROR; z.total_in = z.total_out = 0; z.msg = null; z.istate.mode = BLOCKS; z.istate.blocks.reset(z, null); return Z_OK; } that.inflateEnd = function(z) { if (that.blocks) that.blocks.free(z); that.blocks = null; // ZFREE(z, z->state); return Z_OK; }; that.inflateInit = function(z, w) { z.msg = null; that.blocks = null; // set window size if (w < 8 || w > 15) { that.inflateEnd(z); return Z_STREAM_ERROR; } that.wbits = w; z.istate.blocks = new InfBlocks(z, 1 << w); // reset state inflateReset(z); return Z_OK; }; that.inflate = function(z, f) { var r; var b; if (!z || !z.istate || !z.next_in) return Z_STREAM_ERROR; f = f == Z_FINISH ? Z_BUF_ERROR : Z_OK; r = Z_BUF_ERROR; while (true) { // System.out.println("mode: "+z.istate.mode); switch (z.istate.mode) { case METHOD: if (z.avail_in === 0) return r; r = f; z.avail_in--; z.total_in++; if (((z.istate.method = z.read_byte(z.next_in_index++)) & 0xf) != Z_DEFLATED) { z.istate.mode = BAD; z.msg = "unknown compression method"; z.istate.marker = 5; // can't try inflateSync break; } if ((z.istate.method >> 4) + 8 > z.istate.wbits) { z.istate.mode = BAD; z.msg = "invalid window size"; z.istate.marker = 5; // can't try inflateSync break; } z.istate.mode = FLAG; /* falls through */ case FLAG: if (z.avail_in === 0) return r; r = f; z.avail_in--; z.total_in++; b = (z.read_byte(z.next_in_index++)) & 0xff; if ((((z.istate.method << 8) + b) % 31) !== 0) { z.istate.mode = BAD; z.msg = "incorrect header check"; z.istate.marker = 5; // can't try inflateSync break; } if ((b & PRESET_DICT) === 0) { z.istate.mode = BLOCKS; break; } z.istate.mode = DICT4; /* falls through */ case DICT4: if (z.avail_in === 0) return r; r = f; z.avail_in--; z.total_in++; z.istate.need = ((z.read_byte(z.next_in_index++) & 0xff) << 24) & 0xff000000; z.istate.mode = DICT3; /* falls through */ case DICT3: if (z.avail_in === 0) return r; r = f; z.avail_in--; z.total_in++; z.istate.need += ((z.read_byte(z.next_in_index++) & 0xff) << 16) & 0xff0000; z.istate.mode = DICT2; /* falls through */ case DICT2: if (z.avail_in === 0) return r; r = f; z.avail_in--; z.total_in++; z.istate.need += ((z.read_byte(z.next_in_index++) & 0xff) << 8) & 0xff00; z.istate.mode = DICT1; /* falls through */ case DICT1: if (z.avail_in === 0) return r; r = f; z.avail_in--; z.total_in++; z.istate.need += (z.read_byte(z.next_in_index++) & 0xff); z.istate.mode = DICT0; return Z_NEED_DICT; case DICT0: z.istate.mode = BAD; z.msg = "need dictionary"; z.istate.marker = 0; // can try inflateSync return Z_STREAM_ERROR; case BLOCKS: r = z.istate.blocks.proc(z, r); if (r == Z_DATA_ERROR) { z.istate.mode = BAD; z.istate.marker = 0; // can try inflateSync break; } if (r == Z_OK) { r = f; } if (r != Z_STREAM_END) { return r; } r = f; z.istate.blocks.reset(z, z.istate.was); z.istate.mode = DONE; /* falls through */ case DONE: return Z_STREAM_END; case BAD: return Z_DATA_ERROR; default: return Z_STREAM_ERROR; } } }; that.inflateSetDictionary = function(z, dictionary, dictLength) { var index = 0; var length = dictLength; if (!z || !z.istate || z.istate.mode != DICT0) return Z_STREAM_ERROR; if (length >= (1 << z.istate.wbits)) { length = (1 << z.istate.wbits) - 1; index = dictLength - length; } z.istate.blocks.set_dictionary(dictionary, index, length); z.istate.mode = BLOCKS; return Z_OK; }; that.inflateSync = function(z) { var n; // number of bytes to look at var p; // pointer to bytes var m; // number of marker bytes found in a row var r, w; // temporaries to save total_in and total_out // set up if (!z || !z.istate) return Z_STREAM_ERROR; if (z.istate.mode != BAD) { z.istate.mode = BAD; z.istate.marker = 0; } if ((n = z.avail_in) === 0) return Z_BUF_ERROR; p = z.next_in_index; m = z.istate.marker; // search while (n !== 0 && m < 4) { if (z.read_byte(p) == mark[m]) { m++; } else if (z.read_byte(p) !== 0) { m = 0; } else { m = 4 - m; } p++; n--; } // restore z.total_in += p - z.next_in_index; z.next_in_index = p; z.avail_in = n; z.istate.marker = m; // return no joy or set up to restart on a new block if (m != 4) { return Z_DATA_ERROR; } r = z.total_in; w = z.total_out; inflateReset(z); z.total_in = r; z.total_out = w; z.istate.mode = BLOCKS; return Z_OK; }; // Returns true if inflate is currently at the end of a block generated // by Z_SYNC_FLUSH or Z_FULL_FLUSH. This function is used by one PPP // implementation to provide an additional safety check. PPP uses // Z_SYNC_FLUSH // but removes the length bytes of the resulting empty stored block. When // decompressing, PPP checks that at the end of input packet, inflate is // waiting for these length bytes. that.inflateSyncPoint = function(z) { if (!z || !z.istate || !z.istate.blocks) return Z_STREAM_ERROR; return z.istate.blocks.sync_point(); }; } // ZStream function ZStream() { } ZStream.prototype = { inflateInit : function(bits) { var that = this; that.istate = new Inflate(); if (!bits) bits = MAX_BITS; return that.istate.inflateInit(that, bits); }, inflate : function(f) { var that = this; if (!that.istate) return Z_STREAM_ERROR; return that.istate.inflate(that, f); }, inflateEnd : function() { var that = this; if (!that.istate) return Z_STREAM_ERROR; var ret = that.istate.inflateEnd(that); that.istate = null; return ret; }, inflateSync : function() { var that = this; if (!that.istate) return Z_STREAM_ERROR; return that.istate.inflateSync(that); }, inflateSetDictionary : function(dictionary, dictLength) { var that = this; if (!that.istate) return Z_STREAM_ERROR; return that.istate.inflateSetDictionary(that, dictionary, dictLength); }, read_byte : function(start) { var that = this; return that.next_in.subarray(start, start + 1)[0]; }, read_buf : function(start, size) { var that = this; return that.next_in.subarray(start, start + size); } }; // Inflater export function Inflater() { var that = this; var z = new ZStream(); var bufsize = 512; var flush = Z_NO_FLUSH; var buf = new Uint8Array(bufsize); var nomoreinput = false; z.inflateInit(); z.next_out = buf; that.append = function(data, onprogress) { var err, buffers = [], lastIndex = 0, bufferIndex = 0, bufferSize = 0, array; if (data.length === 0) return; z.next_in_index = 0; z.next_in = data; z.avail_in = data.length; do { z.next_out_index = 0; z.avail_out = bufsize; if ((z.avail_in === 0) && (!nomoreinput)) { // if buffer is empty and more input is available, refill it z.next_in_index = 0; nomoreinput = true; } err = z.inflate(flush); if (nomoreinput && (err === Z_BUF_ERROR)) { if (z.avail_in !== 0) throw new Error("inflating: bad input"); } else if (err !== Z_OK && err !== Z_STREAM_END) throw new Error("inflating: " + z.msg); if ((nomoreinput || err === Z_STREAM_END) && (z.avail_in === data.length)) throw new Error("inflating: bad input"); if (z.next_out_index) if (z.next_out_index === bufsize) buffers.push(new Uint8Array(buf)); else buffers.push(new Uint8Array(buf.subarray(0, z.next_out_index))); bufferSize += z.next_out_index; if (onprogress && z.next_in_index > 0 && z.next_in_index != lastIndex) { onprogress(z.next_in_index); lastIndex = z.next_in_index; } } while (z.avail_in > 0 || z.avail_out === 0); array = new Uint8Array(bufferSize); buffers.forEach(function(chunk) { array.set(chunk, bufferIndex); bufferIndex += chunk.length; }); return array; }; that.flush = function() { z.inflateEnd(); }; } // 'zip' may not be defined in z-worker and some tests self._zipjs_Inflater = Inflater;