diff options
Diffstat (limited to 'alarm/node_modules/pako/lib/zlib/deflate.js')
| -rw-r--r-- | alarm/node_modules/pako/lib/zlib/deflate.js | 1874 |
1 files changed, 0 insertions, 1874 deletions
diff --git a/alarm/node_modules/pako/lib/zlib/deflate.js b/alarm/node_modules/pako/lib/zlib/deflate.js deleted file mode 100644 index 3145698..0000000 --- a/alarm/node_modules/pako/lib/zlib/deflate.js +++ /dev/null @@ -1,1874 +0,0 @@ -'use strict'; - -// (C) 1995-2013 Jean-loup Gailly and Mark Adler -// (C) 2014-2017 Vitaly Puzrin and Andrey Tupitsin -// -// This software is provided 'as-is', without any express or implied -// warranty. In no event will the authors be held liable for any damages -// arising from the use of this software. -// -// Permission is granted to anyone to use this software for any purpose, -// including commercial applications, and to alter it and redistribute it -// freely, subject to the following restrictions: -// -// 1. The origin of this software must not be misrepresented; you must not -// claim that you wrote the original software. If you use this software -// in a product, an acknowledgment in the product documentation would be -// appreciated but is not required. -// 2. Altered source versions must be plainly marked as such, and must not be -// misrepresented as being the original software. -// 3. This notice may not be removed or altered from any source distribution. - -var utils = require('../utils/common'); -var trees = require('./trees'); -var adler32 = require('./adler32'); -var crc32 = require('./crc32'); -var msg = require('./messages'); - -/* Public constants ==========================================================*/ -/* ===========================================================================*/ - - -/* Allowed flush values; see deflate() and inflate() below for details */ -var Z_NO_FLUSH = 0; -var Z_PARTIAL_FLUSH = 1; -//var Z_SYNC_FLUSH = 2; -var Z_FULL_FLUSH = 3; -var Z_FINISH = 4; -var Z_BLOCK = 5; -//var Z_TREES = 6; - - -/* Return codes for the compression/decompression functions. Negative values - * are errors, positive values are used for special but normal events. - */ -var Z_OK = 0; -var Z_STREAM_END = 1; -//var Z_NEED_DICT = 2; -//var Z_ERRNO = -1; -var Z_STREAM_ERROR = -2; -var Z_DATA_ERROR = -3; -//var Z_MEM_ERROR = -4; -var Z_BUF_ERROR = -5; -//var Z_VERSION_ERROR = -6; - - -/* compression levels */ -//var Z_NO_COMPRESSION = 0; -//var Z_BEST_SPEED = 1; -//var Z_BEST_COMPRESSION = 9; -var Z_DEFAULT_COMPRESSION = -1; - - -var Z_FILTERED = 1; -var Z_HUFFMAN_ONLY = 2; -var Z_RLE = 3; -var Z_FIXED = 4; -var Z_DEFAULT_STRATEGY = 0; - -/* Possible values of the data_type field (though see inflate()) */ -//var Z_BINARY = 0; -//var Z_TEXT = 1; -//var Z_ASCII = 1; // = Z_TEXT -var Z_UNKNOWN = 2; - - -/* The deflate compression method */ -var Z_DEFLATED = 8; - -/*============================================================================*/ - - -var MAX_MEM_LEVEL = 9; -/* Maximum value for memLevel in deflateInit2 */ -var MAX_WBITS = 15; -/* 32K LZ77 window */ -var DEF_MEM_LEVEL = 8; - - -var LENGTH_CODES = 29; -/* number of length codes, not counting the special END_BLOCK code */ -var LITERALS = 256; -/* number of literal bytes 0..255 */ -var L_CODES = LITERALS + 1 + LENGTH_CODES; -/* number of Literal or Length codes, including the END_BLOCK code */ -var D_CODES = 30; -/* number of distance codes */ -var BL_CODES = 19; -/* number of codes used to transfer the bit lengths */ -var HEAP_SIZE = 2 * L_CODES + 1; -/* maximum heap size */ -var MAX_BITS = 15; -/* All codes must not exceed MAX_BITS bits */ - -var MIN_MATCH = 3; -var MAX_MATCH = 258; -var MIN_LOOKAHEAD = (MAX_MATCH + MIN_MATCH + 1); - -var PRESET_DICT = 0x20; - -var INIT_STATE = 42; -var EXTRA_STATE = 69; -var NAME_STATE = 73; -var COMMENT_STATE = 91; -var HCRC_STATE = 103; -var BUSY_STATE = 113; -var FINISH_STATE = 666; - -var BS_NEED_MORE = 1; /* block not completed, need more input or more output */ -var BS_BLOCK_DONE = 2; /* block flush performed */ -var BS_FINISH_STARTED = 3; /* finish started, need only more output at next deflate */ -var BS_FINISH_DONE = 4; /* finish done, accept no more input or output */ - -var OS_CODE = 0x03; // Unix :) . Don't detect, use this default. - -function err(strm, errorCode) { - strm.msg = msg[errorCode]; - return errorCode; -} - -function rank(f) { - return ((f) << 1) - ((f) > 4 ? 9 : 0); -} - -function zero(buf) { var len = buf.length; while (--len >= 0) { buf[len] = 0; } } - - -/* ========================================================================= - * Flush as much pending output as possible. All deflate() output goes - * through this function so some applications may wish to modify it - * to avoid allocating a large strm->output buffer and copying into it. - * (See also read_buf()). - */ -function flush_pending(strm) { - var s = strm.state; - - //_tr_flush_bits(s); - var len = s.pending; - if (len > strm.avail_out) { - len = strm.avail_out; - } - if (len === 0) { return; } - - utils.arraySet(strm.output, s.pending_buf, s.pending_out, len, strm.next_out); - strm.next_out += len; - s.pending_out += len; - strm.total_out += len; - strm.avail_out -= len; - s.pending -= len; - if (s.pending === 0) { - s.pending_out = 0; - } -} - - -function flush_block_only(s, last) { - trees._tr_flush_block(s, (s.block_start >= 0 ? s.block_start : -1), s.strstart - s.block_start, last); - s.block_start = s.strstart; - flush_pending(s.strm); -} - - -function put_byte(s, b) { - s.pending_buf[s.pending++] = b; -} - - -/* ========================================================================= - * Put a short in the pending buffer. The 16-bit value is put in MSB order. - * IN assertion: the stream state is correct and there is enough room in - * pending_buf. - */ -function putShortMSB(s, b) { -// put_byte(s, (Byte)(b >> 8)); -// put_byte(s, (Byte)(b & 0xff)); - s.pending_buf[s.pending++] = (b >>> 8) & 0xff; - s.pending_buf[s.pending++] = b & 0xff; -} - - -/* =========================================================================== - * Read a new buffer from the current input stream, update the adler32 - * and total number of bytes read. All deflate() input goes through - * this function so some applications may wish to modify it to avoid - * allocating a large strm->input buffer and copying from it. - * (See also flush_pending()). - */ -function read_buf(strm, buf, start, size) { - var len = strm.avail_in; - - if (len > size) { len = size; } - if (len === 0) { return 0; } - - strm.avail_in -= len; - - // zmemcpy(buf, strm->next_in, len); - utils.arraySet(buf, strm.input, strm.next_in, len, start); - if (strm.state.wrap === 1) { - strm.adler = adler32(strm.adler, buf, len, start); - } - - else if (strm.state.wrap === 2) { - strm.adler = crc32(strm.adler, buf, len, start); - } - - strm.next_in += len; - strm.total_in += len; - - return len; -} - - -/* =========================================================================== - * Set match_start to the longest match starting at the given string and - * return its length. Matches shorter or equal to prev_length are discarded, - * in which case the result is equal to prev_length and match_start is - * garbage. - * IN assertions: cur_match is the head of the hash chain for the current - * string (strstart) and its distance is <= MAX_DIST, and prev_length >= 1 - * OUT assertion: the match length is not greater than s->lookahead. - */ -function longest_match(s, cur_match) { - var chain_length = s.max_chain_length; /* max hash chain length */ - var scan = s.strstart; /* current string */ - var match; /* matched string */ - var len; /* length of current match */ - var best_len = s.prev_length; /* best match length so far */ - var nice_match = s.nice_match; /* stop if match long enough */ - var limit = (s.strstart > (s.w_size - MIN_LOOKAHEAD)) ? - s.strstart - (s.w_size - MIN_LOOKAHEAD) : 0/*NIL*/; - - var _win = s.window; // shortcut - - var wmask = s.w_mask; - var prev = s.prev; - - /* Stop when cur_match becomes <= limit. To simplify the code, - * we prevent matches with the string of window index 0. - */ - - var strend = s.strstart + MAX_MATCH; - var scan_end1 = _win[scan + best_len - 1]; - var scan_end = _win[scan + best_len]; - - /* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16. - * It is easy to get rid of this optimization if necessary. - */ - // Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever"); - - /* Do not waste too much time if we already have a good match: */ - if (s.prev_length >= s.good_match) { - chain_length >>= 2; - } - /* Do not look for matches beyond the end of the input. This is necessary - * to make deflate deterministic. - */ - if (nice_match > s.lookahead) { nice_match = s.lookahead; } - - // Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead"); - - do { - // Assert(cur_match < s->strstart, "no future"); - match = cur_match; - - /* Skip to next match if the match length cannot increase - * or if the match length is less than 2. Note that the checks below - * for insufficient lookahead only occur occasionally for performance - * reasons. Therefore uninitialized memory will be accessed, and - * conditional jumps will be made that depend on those values. - * However the length of the match is limited to the lookahead, so - * the output of deflate is not affected by the uninitialized values. - */ - - if (_win[match + best_len] !== scan_end || - _win[match + best_len - 1] !== scan_end1 || - _win[match] !== _win[scan] || - _win[++match] !== _win[scan + 1]) { - continue; - } - - /* The check at best_len-1 can be removed because it will be made - * again later. (This heuristic is not always a win.) - * It is not necessary to compare scan[2] and match[2] since they - * are always equal when the other bytes match, given that - * the hash keys are equal and that HASH_BITS >= 8. - */ - scan += 2; - match++; - // Assert(*scan == *match, "match[2]?"); - - /* We check for insufficient lookahead only every 8th comparison; - * the 256th check will be made at strstart+258. - */ - do { - /*jshint noempty:false*/ - } while (_win[++scan] === _win[++match] && _win[++scan] === _win[++match] && - _win[++scan] === _win[++match] && _win[++scan] === _win[++match] && - _win[++scan] === _win[++match] && _win[++scan] === _win[++match] && - _win[++scan] === _win[++match] && _win[++scan] === _win[++match] && - scan < strend); - - // Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan"); - - len = MAX_MATCH - (strend - scan); - scan = strend - MAX_MATCH; - - if (len > best_len) { - s.match_start = cur_match; - best_len = len; - if (len >= nice_match) { - break; - } - scan_end1 = _win[scan + best_len - 1]; - scan_end = _win[scan + best_len]; - } - } while ((cur_match = prev[cur_match & wmask]) > limit && --chain_length !== 0); - - if (best_len <= s.lookahead) { - return best_len; - } - return s.lookahead; -} - - -/* =========================================================================== - * Fill the window when the lookahead becomes insufficient. - * Updates strstart and lookahead. - * - * IN assertion: lookahead < MIN_LOOKAHEAD - * OUT assertions: strstart <= window_size-MIN_LOOKAHEAD - * At least one byte has been read, or avail_in == 0; reads are - * performed for at least two bytes (required for the zip translate_eol - * option -- not supported here). - */ -function fill_window(s) { - var _w_size = s.w_size; - var p, n, m, more, str; - - //Assert(s->lookahead < MIN_LOOKAHEAD, "already enough lookahead"); - - do { - more = s.window_size - s.lookahead - s.strstart; - - // JS ints have 32 bit, block below not needed - /* Deal with !@#$% 64K limit: */ - //if (sizeof(int) <= 2) { - // if (more == 0 && s->strstart == 0 && s->lookahead == 0) { - // more = wsize; - // - // } else if (more == (unsigned)(-1)) { - // /* Very unlikely, but possible on 16 bit machine if - // * strstart == 0 && lookahead == 1 (input done a byte at time) - // */ - // more--; - // } - //} - - - /* If the window is almost full and there is insufficient lookahead, - * move the upper half to the lower one to make room in the upper half. - */ - if (s.strstart >= _w_size + (_w_size - MIN_LOOKAHEAD)) { - - utils.arraySet(s.window, s.window, _w_size, _w_size, 0); - s.match_start -= _w_size; - s.strstart -= _w_size; - /* we now have strstart >= MAX_DIST */ - s.block_start -= _w_size; - - /* Slide the hash table (could be avoided with 32 bit values - at the expense of memory usage). We slide even when level == 0 - to keep the hash table consistent if we switch back to level > 0 - later. (Using level 0 permanently is not an optimal usage of - zlib, so we don't care about this pathological case.) - */ - - n = s.hash_size; - p = n; - do { - m = s.head[--p]; - s.head[p] = (m >= _w_size ? m - _w_size : 0); - } while (--n); - - n = _w_size; - p = n; - do { - m = s.prev[--p]; - s.prev[p] = (m >= _w_size ? m - _w_size : 0); - /* If n is not on any hash chain, prev[n] is garbage but - * its value will never be used. - */ - } while (--n); - - more += _w_size; - } - if (s.strm.avail_in === 0) { - break; - } - - /* If there was no sliding: - * strstart <= WSIZE+MAX_DIST-1 && lookahead <= MIN_LOOKAHEAD - 1 && - * more == window_size - lookahead - strstart - * => more >= window_size - (MIN_LOOKAHEAD-1 + WSIZE + MAX_DIST-1) - * => more >= window_size - 2*WSIZE + 2 - * In the BIG_MEM or MMAP case (not yet supported), - * window_size == input_size + MIN_LOOKAHEAD && - * strstart + s->lookahead <= input_size => more >= MIN_LOOKAHEAD. - * Otherwise, window_size == 2*WSIZE so more >= 2. - * If there was sliding, more >= WSIZE. So in all cases, more >= 2. - */ - //Assert(more >= 2, "more < 2"); - n = read_buf(s.strm, s.window, s.strstart + s.lookahead, more); - s.lookahead += n; - - /* Initialize the hash value now that we have some input: */ - if (s.lookahead + s.insert >= MIN_MATCH) { - str = s.strstart - s.insert; - s.ins_h = s.window[str]; - - /* UPDATE_HASH(s, s->ins_h, s->window[str + 1]); */ - s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[str + 1]) & s.hash_mask; -//#if MIN_MATCH != 3 -// Call update_hash() MIN_MATCH-3 more times -//#endif - while (s.insert) { - /* UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]); */ - s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[str + MIN_MATCH - 1]) & s.hash_mask; - - s.prev[str & s.w_mask] = s.head[s.ins_h]; - s.head[s.ins_h] = str; - str++; - s.insert--; - if (s.lookahead + s.insert < MIN_MATCH) { - break; - } - } - } - /* If the whole input has less than MIN_MATCH bytes, ins_h is garbage, - * but this is not important since only literal bytes will be emitted. - */ - - } while (s.lookahead < MIN_LOOKAHEAD && s.strm.avail_in !== 0); - - /* If the WIN_INIT bytes after the end of the current data have never been - * written, then zero those bytes in order to avoid memory check reports of - * the use of uninitialized (or uninitialised as Julian writes) bytes by - * the longest match routines. Update the high water mark for the next - * time through here. WIN_INIT is set to MAX_MATCH since the longest match - * routines allow scanning to strstart + MAX_MATCH, ignoring lookahead. - */ -// if (s.high_water < s.window_size) { -// var curr = s.strstart + s.lookahead; -// var init = 0; -// -// if (s.high_water < curr) { -// /* Previous high water mark below current data -- zero WIN_INIT -// * bytes or up to end of window, whichever is less. -// */ -// init = s.window_size - curr; -// if (init > WIN_INIT) -// init = WIN_INIT; -// zmemzero(s->window + curr, (unsigned)init); -// s->high_water = curr + init; -// } -// else if (s->high_water < (ulg)curr + WIN_INIT) { -// /* High water mark at or above current data, but below current data -// * plus WIN_INIT -- zero out to current data plus WIN_INIT, or up -// * to end of window, whichever is less. -// */ -// init = (ulg)curr + WIN_INIT - s->high_water; -// if (init > s->window_size - s->high_water) -// init = s->window_size - s->high_water; -// zmemzero(s->window + s->high_water, (unsigned)init); -// s->high_water += init; -// } -// } -// -// Assert((ulg)s->strstart <= s->window_size - MIN_LOOKAHEAD, -// "not enough room for search"); -} - -/* =========================================================================== - * Copy without compression as much as possible from the input stream, return - * the current block state. - * This function does not insert new strings in the dictionary since - * uncompressible data is probably not useful. This function is used - * only for the level=0 compression option. - * NOTE: this function should be optimized to avoid extra copying from - * window to pending_buf. - */ -function deflate_stored(s, flush) { - /* Stored blocks are limited to 0xffff bytes, pending_buf is limited - * to pending_buf_size, and each stored block has a 5 byte header: - */ - var max_block_size = 0xffff; - - if (max_block_size > s.pending_buf_size - 5) { - max_block_size = s.pending_buf_size - 5; - } - - /* Copy as much as possible from input to output: */ - for (;;) { - /* Fill the window as much as possible: */ - if (s.lookahead <= 1) { - - //Assert(s->strstart < s->w_size+MAX_DIST(s) || - // s->block_start >= (long)s->w_size, "slide too late"); -// if (!(s.strstart < s.w_size + (s.w_size - MIN_LOOKAHEAD) || -// s.block_start >= s.w_size)) { -// throw new Error("slide too late"); -// } - - fill_window(s); - if (s.lookahead === 0 && flush === Z_NO_FLUSH) { - return BS_NEED_MORE; - } - - if (s.lookahead === 0) { - break; - } - /* flush the current block */ - } - //Assert(s->block_start >= 0L, "block gone"); -// if (s.block_start < 0) throw new Error("block gone"); - - s.strstart += s.lookahead; - s.lookahead = 0; - - /* Emit a stored block if pending_buf will be full: */ - var max_start = s.block_start + max_block_size; - - if (s.strstart === 0 || s.strstart >= max_start) { - /* strstart == 0 is possible when wraparound on 16-bit machine */ - s.lookahead = s.strstart - max_start; - s.strstart = max_start; - /*** FLUSH_BLOCK(s, 0); ***/ - flush_block_only(s, false); - if (s.strm.avail_out === 0) { - return BS_NEED_MORE; - } - /***/ - - - } - /* Flush if we may have to slide, otherwise block_start may become - * negative and the data will be gone: - */ - if (s.strstart - s.block_start >= (s.w_size - MIN_LOOKAHEAD)) { - /*** FLUSH_BLOCK(s, 0); ***/ - flush_block_only(s, false); - if (s.strm.avail_out === 0) { - return BS_NEED_MORE; - } - /***/ - } - } - - s.insert = 0; - - if (flush === Z_FINISH) { - /*** FLUSH_BLOCK(s, 1); ***/ - flush_block_only(s, true); - if (s.strm.avail_out === 0) { - return BS_FINISH_STARTED; - } - /***/ - return BS_FINISH_DONE; - } - - if (s.strstart > s.block_start) { - /*** FLUSH_BLOCK(s, 0); ***/ - flush_block_only(s, false); - if (s.strm.avail_out === 0) { - return BS_NEED_MORE; - } - /***/ - } - - return BS_NEED_MORE; -} - -/* =========================================================================== - * Compress as much as possible from the input stream, return the current - * block state. - * This function does not perform lazy evaluation of matches and inserts - * new strings in the dictionary only for unmatched strings or for short - * matches. It is used only for the fast compression options. - */ -function deflate_fast(s, flush) { - var hash_head; /* head of the hash chain */ - var bflush; /* set if current block must be flushed */ - - for (;;) { - /* Make sure that we always have enough lookahead, except - * at the end of the input file. We need MAX_MATCH bytes - * for the next match, plus MIN_MATCH bytes to insert the - * string following the next match. - */ - if (s.lookahead < MIN_LOOKAHEAD) { - fill_window(s); - if (s.lookahead < MIN_LOOKAHEAD && flush === Z_NO_FLUSH) { - return BS_NEED_MORE; - } - if (s.lookahead === 0) { - break; /* flush the current block */ - } - } - - /* Insert the string window[strstart .. strstart+2] in the - * dictionary, and set hash_head to the head of the hash chain: - */ - hash_head = 0/*NIL*/; - if (s.lookahead >= MIN_MATCH) { - /*** INSERT_STRING(s, s.strstart, hash_head); ***/ - s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[s.strstart + MIN_MATCH - 1]) & s.hash_mask; - hash_head = s.prev[s.strstart & s.w_mask] = s.head[s.ins_h]; - s.head[s.ins_h] = s.strstart; - /***/ - } - - /* Find the longest match, discarding those <= prev_length. - * At this point we have always match_length < MIN_MATCH - */ - if (hash_head !== 0/*NIL*/ && ((s.strstart - hash_head) <= (s.w_size - MIN_LOOKAHEAD))) { - /* To simplify the code, we prevent matches with the string - * of window index 0 (in particular we have to avoid a match - * of the string with itself at the start of the input file). - */ - s.match_length = longest_match(s, hash_head); - /* longest_match() sets match_start */ - } - if (s.match_length >= MIN_MATCH) { - // check_match(s, s.strstart, s.match_start, s.match_length); // for debug only - - /*** _tr_tally_dist(s, s.strstart - s.match_start, - s.match_length - MIN_MATCH, bflush); ***/ - bflush = trees._tr_tally(s, s.strstart - s.match_start, s.match_length - MIN_MATCH); - - s.lookahead -= s.match_length; - - /* Insert new strings in the hash table only if the match length - * is not too large. This saves time but degrades compression. - */ - if (s.match_length <= s.max_lazy_match/*max_insert_length*/ && s.lookahead >= MIN_MATCH) { - s.match_length--; /* string at strstart already in table */ - do { - s.strstart++; - /*** INSERT_STRING(s, s.strstart, hash_head); ***/ - s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[s.strstart + MIN_MATCH - 1]) & s.hash_mask; - hash_head = s.prev[s.strstart & s.w_mask] = s.head[s.ins_h]; - s.head[s.ins_h] = s.strstart; - /***/ - /* strstart never exceeds WSIZE-MAX_MATCH, so there are - * always MIN_MATCH bytes ahead. - */ - } while (--s.match_length !== 0); - s.strstart++; - } else - { - s.strstart += s.match_length; - s.match_length = 0; - s.ins_h = s.window[s.strstart]; - /* UPDATE_HASH(s, s.ins_h, s.window[s.strstart+1]); */ - s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[s.strstart + 1]) & s.hash_mask; - -//#if MIN_MATCH != 3 -// Call UPDATE_HASH() MIN_MATCH-3 more times -//#endif - /* If lookahead < MIN_MATCH, ins_h is garbage, but it does not - * matter since it will be recomputed at next deflate call. - */ - } - } else { - /* No match, output a literal byte */ - //Tracevv((stderr,"%c", s.window[s.strstart])); - /*** _tr_tally_lit(s, s.window[s.strstart], bflush); ***/ - bflush = trees._tr_tally(s, 0, s.window[s.strstart]); - - s.lookahead--; - s.strstart++; - } - if (bflush) { - /*** FLUSH_BLOCK(s, 0); ***/ - flush_block_only(s, false); - if (s.strm.avail_out === 0) { - return BS_NEED_MORE; - } - /***/ - } - } - s.insert = ((s.strstart < (MIN_MATCH - 1)) ? s.strstart : MIN_MATCH - 1); - if (flush === Z_FINISH) { - /*** FLUSH_BLOCK(s, 1); ***/ - flush_block_only(s, true); - if (s.strm.avail_out === 0) { - return BS_FINISH_STARTED; - } - /***/ - return BS_FINISH_DONE; - } - if (s.last_lit) { - /*** FLUSH_BLOCK(s, 0); ***/ - flush_block_only(s, false); - if (s.strm.avail_out === 0) { - return BS_NEED_MORE; - } - /***/ - } - return BS_BLOCK_DONE; -} - -/* =========================================================================== - * Same as above, but achieves better compression. We use a lazy - * evaluation for matches: a match is finally adopted only if there is - * no better match at the next window position. - */ -function deflate_slow(s, flush) { - var hash_head; /* head of hash chain */ - var bflush; /* set if current block must be flushed */ - - var max_insert; - - /* Process the input block. */ - for (;;) { - /* Make sure that we always have enough lookahead, except - * at the end of the input file. We need MAX_MATCH bytes - * for the next match, plus MIN_MATCH bytes to insert the - * string following the next match. - */ - if (s.lookahead < MIN_LOOKAHEAD) { - fill_window(s); - if (s.lookahead < MIN_LOOKAHEAD && flush === Z_NO_FLUSH) { - return BS_NEED_MORE; - } - if (s.lookahead === 0) { break; } /* flush the current block */ - } - - /* Insert the string window[strstart .. strstart+2] in the - * dictionary, and set hash_head to the head of the hash chain: - */ - hash_head = 0/*NIL*/; - if (s.lookahead >= MIN_MATCH) { - /*** INSERT_STRING(s, s.strstart, hash_head); ***/ - s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[s.strstart + MIN_MATCH - 1]) & s.hash_mask; - hash_head = s.prev[s.strstart & s.w_mask] = s.head[s.ins_h]; - s.head[s.ins_h] = s.strstart; - /***/ - } - - /* Find the longest match, discarding those <= prev_length. - */ - s.prev_length = s.match_length; - s.prev_match = s.match_start; - s.match_length = MIN_MATCH - 1; - - if (hash_head !== 0/*NIL*/ && s.prev_length < s.max_lazy_match && - s.strstart - hash_head <= (s.w_size - MIN_LOOKAHEAD)/*MAX_DIST(s)*/) { - /* To simplify the code, we prevent matches with the string - * of window index 0 (in particular we have to avoid a match - * of the string with itself at the start of the input file). - */ - s.match_length = longest_match(s, hash_head); - /* longest_match() sets match_start */ - - if (s.match_length <= 5 && - (s.strategy === Z_FILTERED || (s.match_length === MIN_MATCH && s.strstart - s.match_start > 4096/*TOO_FAR*/))) { - - /* If prev_match is also MIN_MATCH, match_start is garbage - * but we will ignore the current match anyway. - */ - s.match_length = MIN_MATCH - 1; - } - } - /* If there was a match at the previous step and the current - * match is not better, output the previous match: - */ - if (s.prev_length >= MIN_MATCH && s.match_length <= s.prev_length) { - max_insert = s.strstart + s.lookahead - MIN_MATCH; - /* Do not insert strings in hash table beyond this. */ - - //check_match(s, s.strstart-1, s.prev_match, s.prev_length); - - /***_tr_tally_dist(s, s.strstart - 1 - s.prev_match, - s.prev_length - MIN_MATCH, bflush);***/ - bflush = trees._tr_tally(s, s.strstart - 1 - s.prev_match, s.prev_length - MIN_MATCH); - /* Insert in hash table all strings up to the end of the match. - * strstart-1 and strstart are already inserted. If there is not - * enough lookahead, the last two strings are not inserted in - * the hash table. - */ - s.lookahead -= s.prev_length - 1; - s.prev_length -= 2; - do { - if (++s.strstart <= max_insert) { - /*** INSERT_STRING(s, s.strstart, hash_head); ***/ - s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[s.strstart + MIN_MATCH - 1]) & s.hash_mask; - hash_head = s.prev[s.strstart & s.w_mask] = s.head[s.ins_h]; - s.head[s.ins_h] = s.strstart; - /***/ - } - } while (--s.prev_length !== 0); - s.match_available = 0; - s.match_length = MIN_MATCH - 1; - s.strstart++; - - if (bflush) { - /*** FLUSH_BLOCK(s, 0); ***/ - flush_block_only(s, false); - if (s.strm.avail_out === 0) { - return BS_NEED_MORE; - } - /***/ - } - - } else if (s.match_available) { - /* If there was no match at the previous position, output a - * single literal. If there was a match but the current match - * is longer, truncate the previous match to a single literal. - */ - //Tracevv((stderr,"%c", s->window[s->strstart-1])); - /*** _tr_tally_lit(s, s.window[s.strstart-1], bflush); ***/ - bflush = trees._tr_tally(s, 0, s.window[s.strstart - 1]); - - if (bflush) { - /*** FLUSH_BLOCK_ONLY(s, 0) ***/ - flush_block_only(s, false); - /***/ - } - s.strstart++; - s.lookahead--; - if (s.strm.avail_out === 0) { - return BS_NEED_MORE; - } - } else { - /* There is no previous match to compare with, wait for - * the next step to decide. - */ - s.match_available = 1; - s.strstart++; - s.lookahead--; - } - } - //Assert (flush != Z_NO_FLUSH, "no flush?"); - if (s.match_available) { - //Tracevv((stderr,"%c", s->window[s->strstart-1])); - /*** _tr_tally_lit(s, s.window[s.strstart-1], bflush); ***/ - bflush = trees._tr_tally(s, 0, s.window[s.strstart - 1]); - - s.match_available = 0; - } - s.insert = s.strstart < MIN_MATCH - 1 ? s.strstart : MIN_MATCH - 1; - if (flush === Z_FINISH) { - /*** FLUSH_BLOCK(s, 1); ***/ - flush_block_only(s, true); - if (s.strm.avail_out === 0) { - return BS_FINISH_STARTED; - } - /***/ - return BS_FINISH_DONE; - } - if (s.last_lit) { - /*** FLUSH_BLOCK(s, 0); ***/ - flush_block_only(s, false); - if (s.strm.avail_out === 0) { - return BS_NEED_MORE; - } - /***/ - } - - return BS_BLOCK_DONE; -} - - -/* =========================================================================== - * For Z_RLE, simply look for runs of bytes, generate matches only of distance - * one. Do not maintain a hash table. (It will be regenerated if this run of - * deflate switches away from Z_RLE.) - */ -function deflate_rle(s, flush) { - var bflush; /* set if current block must be flushed */ - var prev; /* byte at distance one to match */ - var scan, strend; /* scan goes up to strend for length of run */ - - var _win = s.window; - - for (;;) { - /* Make sure that we always have enough lookahead, except - * at the end of the input file. We need MAX_MATCH bytes - * for the longest run, plus one for the unrolled loop. - */ - if (s.lookahead <= MAX_MATCH) { - fill_window(s); - if (s.lookahead <= MAX_MATCH && flush === Z_NO_FLUSH) { - return BS_NEED_MORE; - } - if (s.lookahead === 0) { break; } /* flush the current block */ - } - - /* See how many times the previous byte repeats */ - s.match_length = 0; - if (s.lookahead >= MIN_MATCH && s.strstart > 0) { - scan = s.strstart - 1; - prev = _win[scan]; - if (prev === _win[++scan] && prev === _win[++scan] && prev === _win[++scan]) { - strend = s.strstart + MAX_MATCH; - do { - /*jshint noempty:false*/ - } while (prev === _win[++scan] && prev === _win[++scan] && - prev === _win[++scan] && prev === _win[++scan] && - prev === _win[++scan] && prev === _win[++scan] && - prev === _win[++scan] && prev === _win[++scan] && - scan < strend); - s.match_length = MAX_MATCH - (strend - scan); - if (s.match_length > s.lookahead) { - s.match_length = s.lookahead; - } - } - //Assert(scan <= s->window+(uInt)(s->window_size-1), "wild scan"); - } - - /* Emit match if have run of MIN_MATCH or longer, else emit literal */ - if (s.match_length >= MIN_MATCH) { - //check_match(s, s.strstart, s.strstart - 1, s.match_length); - - /*** _tr_tally_dist(s, 1, s.match_length - MIN_MATCH, bflush); ***/ - bflush = trees._tr_tally(s, 1, s.match_length - MIN_MATCH); - - s.lookahead -= s.match_length; - s.strstart += s.match_length; - s.match_length = 0; - } else { - /* No match, output a literal byte */ - //Tracevv((stderr,"%c", s->window[s->strstart])); - /*** _tr_tally_lit(s, s.window[s.strstart], bflush); ***/ - bflush = trees._tr_tally(s, 0, s.window[s.strstart]); - - s.lookahead--; - s.strstart++; - } - if (bflush) { - /*** FLUSH_BLOCK(s, 0); ***/ - flush_block_only(s, false); - if (s.strm.avail_out === 0) { - return BS_NEED_MORE; - } - /***/ - } - } - s.insert = 0; - if (flush === Z_FINISH) { - /*** FLUSH_BLOCK(s, 1); ***/ - flush_block_only(s, true); - if (s.strm.avail_out === 0) { - return BS_FINISH_STARTED; - } - /***/ - return BS_FINISH_DONE; - } - if (s.last_lit) { - /*** FLUSH_BLOCK(s, 0); ***/ - flush_block_only(s, false); - if (s.strm.avail_out === 0) { - return BS_NEED_MORE; - } - /***/ - } - return BS_BLOCK_DONE; -} - -/* =========================================================================== - * For Z_HUFFMAN_ONLY, do not look for matches. Do not maintain a hash table. - * (It will be regenerated if this run of deflate switches away from Huffman.) - */ -function deflate_huff(s, flush) { - var bflush; /* set if current block must be flushed */ - - for (;;) { - /* Make sure that we have a literal to write. */ - if (s.lookahead === 0) { - fill_window(s); - if (s.lookahead === 0) { - if (flush === Z_NO_FLUSH) { - return BS_NEED_MORE; - } - break; /* flush the current block */ - } - } - - /* Output a literal byte */ - s.match_length = 0; - //Tracevv((stderr,"%c", s->window[s->strstart])); - /*** _tr_tally_lit(s, s.window[s.strstart], bflush); ***/ - bflush = trees._tr_tally(s, 0, s.window[s.strstart]); - s.lookahead--; - s.strstart++; - if (bflush) { - /*** FLUSH_BLOCK(s, 0); ***/ - flush_block_only(s, false); - if (s.strm.avail_out === 0) { - return BS_NEED_MORE; - } - /***/ - } - } - s.insert = 0; - if (flush === Z_FINISH) { - /*** FLUSH_BLOCK(s, 1); ***/ - flush_block_only(s, true); - if (s.strm.avail_out === 0) { - return BS_FINISH_STARTED; - } - /***/ - return BS_FINISH_DONE; - } - if (s.last_lit) { - /*** FLUSH_BLOCK(s, 0); ***/ - flush_block_only(s, false); - if (s.strm.avail_out === 0) { - return BS_NEED_MORE; - } - /***/ - } - return BS_BLOCK_DONE; -} - -/* Values for max_lazy_match, good_match and max_chain_length, depending on - * the desired pack level (0..9). The values given below have been tuned to - * exclude worst case performance for pathological files. Better values may be - * found for specific files. - */ -function Config(good_length, max_lazy, nice_length, max_chain, func) { - this.good_length = good_length; - this.max_lazy = max_lazy; - this.nice_length = nice_length; - this.max_chain = max_chain; - this.func = func; -} - -var configuration_table; - -configuration_table = [ - /* good lazy nice chain */ - new Config(0, 0, 0, 0, deflate_stored), /* 0 store only */ - new Config(4, 4, 8, 4, deflate_fast), /* 1 max speed, no lazy matches */ - new Config(4, 5, 16, 8, deflate_fast), /* 2 */ - new Config(4, 6, 32, 32, deflate_fast), /* 3 */ - - new Config(4, 4, 16, 16, deflate_slow), /* 4 lazy matches */ - new Config(8, 16, 32, 32, deflate_slow), /* 5 */ - new Config(8, 16, 128, 128, deflate_slow), /* 6 */ - new Config(8, 32, 128, 256, deflate_slow), /* 7 */ - new Config(32, 128, 258, 1024, deflate_slow), /* 8 */ - new Config(32, 258, 258, 4096, deflate_slow) /* 9 max compression */ -]; - - -/* =========================================================================== - * Initialize the "longest match" routines for a new zlib stream - */ -function lm_init(s) { - s.window_size = 2 * s.w_size; - - /*** CLEAR_HASH(s); ***/ - zero(s.head); // Fill with NIL (= 0); - - /* Set the default configuration parameters: - */ - s.max_lazy_match = configuration_table[s.level].max_lazy; - s.good_match = configuration_table[s.level].good_length; - s.nice_match = configuration_table[s.level].nice_length; - s.max_chain_length = configuration_table[s.level].max_chain; - - s.strstart = 0; - s.block_start = 0; - s.lookahead = 0; - s.insert = 0; - s.match_length = s.prev_length = MIN_MATCH - 1; - s.match_available = 0; - s.ins_h = 0; -} - - -function DeflateState() { - this.strm = null; /* pointer back to this zlib stream */ - this.status = 0; /* as the name implies */ - this.pending_buf = null; /* output still pending */ - this.pending_buf_size = 0; /* size of pending_buf */ - this.pending_out = 0; /* next pending byte to output to the stream */ - this.pending = 0; /* nb of bytes in the pending buffer */ - this.wrap = 0; /* bit 0 true for zlib, bit 1 true for gzip */ - this.gzhead = null; /* gzip header information to write */ - this.gzindex = 0; /* where in extra, name, or comment */ - this.method = Z_DEFLATED; /* can only be DEFLATED */ - this.last_flush = -1; /* value of flush param for previous deflate call */ - - this.w_size = 0; /* LZ77 window size (32K by default) */ - this.w_bits = 0; /* log2(w_size) (8..16) */ - this.w_mask = 0; /* w_size - 1 */ - - this.window = null; - /* Sliding window. Input bytes are read into the second half of the window, - * and move to the first half later to keep a dictionary of at least wSize - * bytes. With this organization, matches are limited to a distance of - * wSize-MAX_MATCH bytes, but this ensures that IO is always - * performed with a length multiple of the block size. - */ - - this.window_size = 0; - /* Actual size of window: 2*wSize, except when the user input buffer - * is directly used as sliding window. - */ - - this.prev = null; - /* Link to older string with same hash index. To limit the size of this - * array to 64K, this link is maintained only for the last 32K strings. - * An index in this array is thus a window index modulo 32K. - */ - - this.head = null; /* Heads of the hash chains or NIL. */ - - this.ins_h = 0; /* hash index of string to be inserted */ - this.hash_size = 0; /* number of elements in hash table */ - this.hash_bits = 0; /* log2(hash_size) */ - this.hash_mask = 0; /* hash_size-1 */ - - this.hash_shift = 0; - /* Number of bits by which ins_h must be shifted at each input - * step. It must be such that after MIN_MATCH steps, the oldest - * byte no longer takes part in the hash key, that is: - * hash_shift * MIN_MATCH >= hash_bits - */ - - this.block_start = 0; - /* Window position at the beginning of the current output block. Gets - * negative when the window is moved backwards. - */ - - this.match_length = 0; /* length of best match */ - this.prev_match = 0; /* previous match */ - this.match_available = 0; /* set if previous match exists */ - this.strstart = 0; /* start of string to insert */ - this.match_start = 0; /* start of matching string */ - this.lookahead = 0; /* number of valid bytes ahead in window */ - - this.prev_length = 0; - /* Length of the best match at previous step. Matches not greater than this - * are discarded. This is used in the lazy match evaluation. - */ - - this.max_chain_length = 0; - /* To speed up deflation, hash chains are never searched beyond this - * length. A higher limit improves compression ratio but degrades the - * speed. - */ - - this.max_lazy_match = 0; - /* Attempt to find a better match only when the current match is strictly - * smaller than this value. This mechanism is used only for compression - * levels >= 4. - */ - // That's alias to max_lazy_match, don't use directly - //this.max_insert_length = 0; - /* Insert new strings in the hash table only if the match length is not - * greater than this length. This saves time but degrades compression. - * max_insert_length is used only for compression levels <= 3. - */ - - this.level = 0; /* compression level (1..9) */ - this.strategy = 0; /* favor or force Huffman coding*/ - - this.good_match = 0; - /* Use a faster search when the previous match is longer than this */ - - this.nice_match = 0; /* Stop searching when current match exceeds this */ - - /* used by trees.c: */ - - /* Didn't use ct_data typedef below to suppress compiler warning */ - - // struct ct_data_s dyn_ltree[HEAP_SIZE]; /* literal and length tree */ - // struct ct_data_s dyn_dtree[2*D_CODES+1]; /* distance tree */ - // struct ct_data_s bl_tree[2*BL_CODES+1]; /* Huffman tree for bit lengths */ - - // Use flat array of DOUBLE size, with interleaved fata, - // because JS does not support effective - this.dyn_ltree = new utils.Buf16(HEAP_SIZE * 2); - this.dyn_dtree = new utils.Buf16((2 * D_CODES + 1) * 2); - this.bl_tree = new utils.Buf16((2 * BL_CODES + 1) * 2); - zero(this.dyn_ltree); - zero(this.dyn_dtree); - zero(this.bl_tree); - - this.l_desc = null; /* desc. for literal tree */ - this.d_desc = null; /* desc. for distance tree */ - this.bl_desc = null; /* desc. for bit length tree */ - - //ush bl_count[MAX_BITS+1]; - this.bl_count = new utils.Buf16(MAX_BITS + 1); - /* number of codes at each bit length for an optimal tree */ - - //int heap[2*L_CODES+1]; /* heap used to build the Huffman trees */ - this.heap = new utils.Buf16(2 * L_CODES + 1); /* heap used to build the Huffman trees */ - zero(this.heap); - - this.heap_len = 0; /* number of elements in the heap */ - this.heap_max = 0; /* element of largest frequency */ - /* The sons of heap[n] are heap[2*n] and heap[2*n+1]. heap[0] is not used. - * The same heap array is used to build all trees. - */ - - this.depth = new utils.Buf16(2 * L_CODES + 1); //uch depth[2*L_CODES+1]; - zero(this.depth); - /* Depth of each subtree used as tie breaker for trees of equal frequency - */ - - this.l_buf = 0; /* buffer index for literals or lengths */ - - this.lit_bufsize = 0; - /* Size of match buffer for literals/lengths. There are 4 reasons for - * limiting lit_bufsize to 64K: - * - frequencies can be kept in 16 bit counters - * - if compression is not successful for the first block, all input - * data is still in the window so we can still emit a stored block even - * when input comes from standard input. (This can also be done for - * all blocks if lit_bufsize is not greater than 32K.) - * - if compression is not successful for a file smaller than 64K, we can - * even emit a stored file instead of a stored block (saving 5 bytes). - * This is applicable only for zip (not gzip or zlib). - * - creating new Huffman trees less frequently may not provide fast - * adaptation to changes in the input data statistics. (Take for - * example a binary file with poorly compressible code followed by - * a highly compressible string table.) Smaller buffer sizes give - * fast adaptation but have of course the overhead of transmitting - * trees more frequently. - * - I can't count above 4 - */ - - this.last_lit = 0; /* running index in l_buf */ - - this.d_buf = 0; - /* Buffer index for distances. To simplify the code, d_buf and l_buf have - * the same number of elements. To use different lengths, an extra flag - * array would be necessary. - */ - - this.opt_len = 0; /* bit length of current block with optimal trees */ - this.static_len = 0; /* bit length of current block with static trees */ - this.matches = 0; /* number of string matches in current block */ - this.insert = 0; /* bytes at end of window left to insert */ - - - this.bi_buf = 0; - /* Output buffer. bits are inserted starting at the bottom (least - * significant bits). - */ - this.bi_valid = 0; - /* Number of valid bits in bi_buf. All bits above the last valid bit - * are always zero. - */ - - // Used for window memory init. We safely ignore it for JS. That makes - // sense only for pointers and memory check tools. - //this.high_water = 0; - /* High water mark offset in window for initialized bytes -- bytes above - * this are set to zero in order to avoid memory check warnings when - * longest match routines access bytes past the input. This is then - * updated to the new high water mark. - */ -} - - -function deflateResetKeep(strm) { - var s; - - if (!strm || !strm.state) { - return err(strm, Z_STREAM_ERROR); - } - - strm.total_in = strm.total_out = 0; - strm.data_type = Z_UNKNOWN; - - s = strm.state; - s.pending = 0; - s.pending_out = 0; - - if (s.wrap < 0) { - s.wrap = -s.wrap; - /* was made negative by deflate(..., Z_FINISH); */ - } - s.status = (s.wrap ? INIT_STATE : BUSY_STATE); - strm.adler = (s.wrap === 2) ? - 0 // crc32(0, Z_NULL, 0) - : - 1; // adler32(0, Z_NULL, 0) - s.last_flush = Z_NO_FLUSH; - trees._tr_init(s); - return Z_OK; -} - - -function deflateReset(strm) { - var ret = deflateResetKeep(strm); - if (ret === Z_OK) { - lm_init(strm.state); - } - return ret; -} - - -function deflateSetHeader(strm, head) { - if (!strm || !strm.state) { return Z_STREAM_ERROR; } - if (strm.state.wrap !== 2) { return Z_STREAM_ERROR; } - strm.state.gzhead = head; - return Z_OK; -} - - -function deflateInit2(strm, level, method, windowBits, memLevel, strategy) { - if (!strm) { // === Z_NULL - return Z_STREAM_ERROR; - } - var wrap = 1; - - if (level === Z_DEFAULT_COMPRESSION) { - level = 6; - } - - if (windowBits < 0) { /* suppress zlib wrapper */ - wrap = 0; - windowBits = -windowBits; - } - - else if (windowBits > 15) { - wrap = 2; /* write gzip wrapper instead */ - windowBits -= 16; - } - - - if (memLevel < 1 || memLevel > MAX_MEM_LEVEL || method !== Z_DEFLATED || - windowBits < 8 || windowBits > 15 || level < 0 || level > 9 || - strategy < 0 || strategy > Z_FIXED) { - return err(strm, Z_STREAM_ERROR); - } - - - if (windowBits === 8) { - windowBits = 9; - } - /* until 256-byte window bug fixed */ - - var s = new DeflateState(); - - strm.state = s; - s.strm = strm; - - s.wrap = wrap; - s.gzhead = null; - s.w_bits = windowBits; - s.w_size = 1 << s.w_bits; - s.w_mask = s.w_size - 1; - - s.hash_bits = memLevel + 7; - s.hash_size = 1 << s.hash_bits; - s.hash_mask = s.hash_size - 1; - s.hash_shift = ~~((s.hash_bits + MIN_MATCH - 1) / MIN_MATCH); - - s.window = new utils.Buf8(s.w_size * 2); - s.head = new utils.Buf16(s.hash_size); - s.prev = new utils.Buf16(s.w_size); - - // Don't need mem init magic for JS. - //s.high_water = 0; /* nothing written to s->window yet */ - - s.lit_bufsize = 1 << (memLevel + 6); /* 16K elements by default */ - - s.pending_buf_size = s.lit_bufsize * 4; - - //overlay = (ushf *) ZALLOC(strm, s->lit_bufsize, sizeof(ush)+2); - //s->pending_buf = (uchf *) overlay; - s.pending_buf = new utils.Buf8(s.pending_buf_size); - - // It is offset from `s.pending_buf` (size is `s.lit_bufsize * 2`) - //s->d_buf = overlay + s->lit_bufsize/sizeof(ush); - s.d_buf = 1 * s.lit_bufsize; - - //s->l_buf = s->pending_buf + (1+sizeof(ush))*s->lit_bufsize; - s.l_buf = (1 + 2) * s.lit_bufsize; - - s.level = level; - s.strategy = strategy; - s.method = method; - - return deflateReset(strm); -} - -function deflateInit(strm, level) { - return deflateInit2(strm, level, Z_DEFLATED, MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY); -} - - -function deflate(strm, flush) { - var old_flush, s; - var beg, val; // for gzip header write only - - if (!strm || !strm.state || - flush > Z_BLOCK || flush < 0) { - return strm ? err(strm, Z_STREAM_ERROR) : Z_STREAM_ERROR; - } - - s = strm.state; - - if (!strm.output || - (!strm.input && strm.avail_in !== 0) || - (s.status === FINISH_STATE && flush !== Z_FINISH)) { - return err(strm, (strm.avail_out === 0) ? Z_BUF_ERROR : Z_STREAM_ERROR); - } - - s.strm = strm; /* just in case */ - old_flush = s.last_flush; - s.last_flush = flush; - - /* Write the header */ - if (s.status === INIT_STATE) { - - if (s.wrap === 2) { // GZIP header - strm.adler = 0; //crc32(0L, Z_NULL, 0); - put_byte(s, 31); - put_byte(s, 139); - put_byte(s, 8); - if (!s.gzhead) { // s->gzhead == Z_NULL - put_byte(s, 0); - put_byte(s, 0); - put_byte(s, 0); - put_byte(s, 0); - put_byte(s, 0); - put_byte(s, s.level === 9 ? 2 : - (s.strategy >= Z_HUFFMAN_ONLY || s.level < 2 ? - 4 : 0)); - put_byte(s, OS_CODE); - s.status = BUSY_STATE; - } - else { - put_byte(s, (s.gzhead.text ? 1 : 0) + - (s.gzhead.hcrc ? 2 : 0) + - (!s.gzhead.extra ? 0 : 4) + - (!s.gzhead.name ? 0 : 8) + - (!s.gzhead.comment ? 0 : 16) - ); - put_byte(s, s.gzhead.time & 0xff); - put_byte(s, (s.gzhead.time >> 8) & 0xff); - put_byte(s, (s.gzhead.time >> 16) & 0xff); - put_byte(s, (s.gzhead.time >> 24) & 0xff); - put_byte(s, s.level === 9 ? 2 : - (s.strategy >= Z_HUFFMAN_ONLY || s.level < 2 ? - 4 : 0)); - put_byte(s, s.gzhead.os & 0xff); - if (s.gzhead.extra && s.gzhead.extra.length) { - put_byte(s, s.gzhead.extra.length & 0xff); - put_byte(s, (s.gzhead.extra.length >> 8) & 0xff); - } - if (s.gzhead.hcrc) { - strm.adler = crc32(strm.adler, s.pending_buf, s.pending, 0); - } - s.gzindex = 0; - s.status = EXTRA_STATE; - } - } - else // DEFLATE header - { - var header = (Z_DEFLATED + ((s.w_bits - 8) << 4)) << 8; - var level_flags = -1; - - if (s.strategy >= Z_HUFFMAN_ONLY || s.level < 2) { - level_flags = 0; - } else if (s.level < 6) { - level_flags = 1; - } else if (s.level === 6) { - level_flags = 2; - } else { - level_flags = 3; - } - header |= (level_flags << 6); - if (s.strstart !== 0) { header |= PRESET_DICT; } - header += 31 - (header % 31); - - s.status = BUSY_STATE; - putShortMSB(s, header); - - /* Save the adler32 of the preset dictionary: */ - if (s.strstart !== 0) { - putShortMSB(s, strm.adler >>> 16); - putShortMSB(s, strm.adler & 0xffff); - } - strm.adler = 1; // adler32(0L, Z_NULL, 0); - } - } - -//#ifdef GZIP - if (s.status === EXTRA_STATE) { - if (s.gzhead.extra/* != Z_NULL*/) { - beg = s.pending; /* start of bytes to update crc */ - - while (s.gzindex < (s.gzhead.extra.length & 0xffff)) { - if (s.pending === s.pending_buf_size) { - if (s.gzhead.hcrc && s.pending > beg) { - strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg); - } - flush_pending(strm); - beg = s.pending; - if (s.pending === s.pending_buf_size) { - break; - } - } - put_byte(s, s.gzhead.extra[s.gzindex] & 0xff); - s.gzindex++; - } - if (s.gzhead.hcrc && s.pending > beg) { - strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg); - } - if (s.gzindex === s.gzhead.extra.length) { - s.gzindex = 0; - s.status = NAME_STATE; - } - } - else { - s.status = NAME_STATE; - } - } - if (s.status === NAME_STATE) { - if (s.gzhead.name/* != Z_NULL*/) { - beg = s.pending; /* start of bytes to update crc */ - //int val; - - do { - if (s.pending === s.pending_buf_size) { - if (s.gzhead.hcrc && s.pending > beg) { - strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg); - } - flush_pending(strm); - beg = s.pending; - if (s.pending === s.pending_buf_size) { - val = 1; - break; - } - } - // JS specific: little magic to add zero terminator to end of string - if (s.gzindex < s.gzhead.name.length) { - val = s.gzhead.name.charCodeAt(s.gzindex++) & 0xff; - } else { - val = 0; - } - put_byte(s, val); - } while (val !== 0); - - if (s.gzhead.hcrc && s.pending > beg) { - strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg); - } - if (val === 0) { - s.gzindex = 0; - s.status = COMMENT_STATE; - } - } - else { - s.status = COMMENT_STATE; - } - } - if (s.status === COMMENT_STATE) { - if (s.gzhead.comment/* != Z_NULL*/) { - beg = s.pending; /* start of bytes to update crc */ - //int val; - - do { - if (s.pending === s.pending_buf_size) { - if (s.gzhead.hcrc && s.pending > beg) { - strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg); - } - flush_pending(strm); - beg = s.pending; - if (s.pending === s.pending_buf_size) { - val = 1; - break; - } - } - // JS specific: little magic to add zero terminator to end of string - if (s.gzindex < s.gzhead.comment.length) { - val = s.gzhead.comment.charCodeAt(s.gzindex++) & 0xff; - } else { - val = 0; - } - put_byte(s, val); - } while (val !== 0); - - if (s.gzhead.hcrc && s.pending > beg) { - strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg); - } - if (val === 0) { - s.status = HCRC_STATE; - } - } - else { - s.status = HCRC_STATE; - } - } - if (s.status === HCRC_STATE) { - if (s.gzhead.hcrc) { - if (s.pending + 2 > s.pending_buf_size) { - flush_pending(strm); - } - if (s.pending + 2 <= s.pending_buf_size) { - put_byte(s, strm.adler & 0xff); - put_byte(s, (strm.adler >> 8) & 0xff); - strm.adler = 0; //crc32(0L, Z_NULL, 0); - s.status = BUSY_STATE; - } - } - else { - s.status = BUSY_STATE; - } - } -//#endif - - /* Flush as much pending output as possible */ - if (s.pending !== 0) { - flush_pending(strm); - if (strm.avail_out === 0) { - /* Since avail_out is 0, deflate will be called again with - * more output space, but possibly with both pending and - * avail_in equal to zero. There won't be anything to do, - * but this is not an error situation so make sure we - * return OK instead of BUF_ERROR at next call of deflate: - */ - s.last_flush = -1; - return Z_OK; - } - - /* Make sure there is something to do and avoid duplicate consecutive - * flushes. For repeated and useless calls with Z_FINISH, we keep - * returning Z_STREAM_END instead of Z_BUF_ERROR. - */ - } else if (strm.avail_in === 0 && rank(flush) <= rank(old_flush) && - flush !== Z_FINISH) { - return err(strm, Z_BUF_ERROR); - } - - /* User must not provide more input after the first FINISH: */ - if (s.status === FINISH_STATE && strm.avail_in !== 0) { - return err(strm, Z_BUF_ERROR); - } - - /* Start a new block or continue the current one. - */ - if (strm.avail_in !== 0 || s.lookahead !== 0 || - (flush !== Z_NO_FLUSH && s.status !== FINISH_STATE)) { - var bstate = (s.strategy === Z_HUFFMAN_ONLY) ? deflate_huff(s, flush) : - (s.strategy === Z_RLE ? deflate_rle(s, flush) : - configuration_table[s.level].func(s, flush)); - - if (bstate === BS_FINISH_STARTED || bstate === BS_FINISH_DONE) { - s.status = FINISH_STATE; - } - if (bstate === BS_NEED_MORE || bstate === BS_FINISH_STARTED) { - if (strm.avail_out === 0) { - s.last_flush = -1; - /* avoid BUF_ERROR next call, see above */ - } - return Z_OK; - /* If flush != Z_NO_FLUSH && avail_out == 0, the next call - * of deflate should use the same flush parameter to make sure - * that the flush is complete. So we don't have to output an - * empty block here, this will be done at next call. This also - * ensures that for a very small output buffer, we emit at most - * one empty block. - */ - } - if (bstate === BS_BLOCK_DONE) { - if (flush === Z_PARTIAL_FLUSH) { - trees._tr_align(s); - } - else if (flush !== Z_BLOCK) { /* FULL_FLUSH or SYNC_FLUSH */ - - trees._tr_stored_block(s, 0, 0, false); - /* For a full flush, this empty block will be recognized - * as a special marker by inflate_sync(). - */ - if (flush === Z_FULL_FLUSH) { - /*** CLEAR_HASH(s); ***/ /* forget history */ - zero(s.head); // Fill with NIL (= 0); - - if (s.lookahead === 0) { - s.strstart = 0; - s.block_start = 0; - s.insert = 0; - } - } - } - flush_pending(strm); - if (strm.avail_out === 0) { - s.last_flush = -1; /* avoid BUF_ERROR at next call, see above */ - return Z_OK; - } - } - } - //Assert(strm->avail_out > 0, "bug2"); - //if (strm.avail_out <= 0) { throw new Error("bug2");} - - if (flush !== Z_FINISH) { return Z_OK; } - if (s.wrap <= 0) { return Z_STREAM_END; } - - /* Write the trailer */ - if (s.wrap === 2) { - put_byte(s, strm.adler & 0xff); - put_byte(s, (strm.adler >> 8) & 0xff); - put_byte(s, (strm.adler >> 16) & 0xff); - put_byte(s, (strm.adler >> 24) & 0xff); - put_byte(s, strm.total_in & 0xff); - put_byte(s, (strm.total_in >> 8) & 0xff); - put_byte(s, (strm.total_in >> 16) & 0xff); - put_byte(s, (strm.total_in >> 24) & 0xff); - } - else - { - putShortMSB(s, strm.adler >>> 16); - putShortMSB(s, strm.adler & 0xffff); - } - - flush_pending(strm); - /* If avail_out is zero, the application will call deflate again - * to flush the rest. - */ - if (s.wrap > 0) { s.wrap = -s.wrap; } - /* write the trailer only once! */ - return s.pending !== 0 ? Z_OK : Z_STREAM_END; -} - -function deflateEnd(strm) { - var status; - - if (!strm/*== Z_NULL*/ || !strm.state/*== Z_NULL*/) { - return Z_STREAM_ERROR; - } - - status = strm.state.status; - if (status !== INIT_STATE && - status !== EXTRA_STATE && - status !== NAME_STATE && - status !== COMMENT_STATE && - status !== HCRC_STATE && - status !== BUSY_STATE && - status !== FINISH_STATE - ) { - return err(strm, Z_STREAM_ERROR); - } - - strm.state = null; - - return status === BUSY_STATE ? err(strm, Z_DATA_ERROR) : Z_OK; -} - - -/* ========================================================================= - * Initializes the compression dictionary from the given byte - * sequence without producing any compressed output. - */ -function deflateSetDictionary(strm, dictionary) { - var dictLength = dictionary.length; - - var s; - var str, n; - var wrap; - var avail; - var next; - var input; - var tmpDict; - - if (!strm/*== Z_NULL*/ || !strm.state/*== Z_NULL*/) { - return Z_STREAM_ERROR; - } - - s = strm.state; - wrap = s.wrap; - - if (wrap === 2 || (wrap === 1 && s.status !== INIT_STATE) || s.lookahead) { - return Z_STREAM_ERROR; - } - - /* when using zlib wrappers, compute Adler-32 for provided dictionary */ - if (wrap === 1) { - /* adler32(strm->adler, dictionary, dictLength); */ - strm.adler = adler32(strm.adler, dictionary, dictLength, 0); - } - - s.wrap = 0; /* avoid computing Adler-32 in read_buf */ - - /* if dictionary would fill window, just replace the history */ - if (dictLength >= s.w_size) { - if (wrap === 0) { /* already empty otherwise */ - /*** CLEAR_HASH(s); ***/ - zero(s.head); // Fill with NIL (= 0); - s.strstart = 0; - s.block_start = 0; - s.insert = 0; - } - /* use the tail */ - // dictionary = dictionary.slice(dictLength - s.w_size); - tmpDict = new utils.Buf8(s.w_size); - utils.arraySet(tmpDict, dictionary, dictLength - s.w_size, s.w_size, 0); - dictionary = tmpDict; - dictLength = s.w_size; - } - /* insert dictionary into window and hash */ - avail = strm.avail_in; - next = strm.next_in; - input = strm.input; - strm.avail_in = dictLength; - strm.next_in = 0; - strm.input = dictionary; - fill_window(s); - while (s.lookahead >= MIN_MATCH) { - str = s.strstart; - n = s.lookahead - (MIN_MATCH - 1); - do { - /* UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]); */ - s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[str + MIN_MATCH - 1]) & s.hash_mask; - - s.prev[str & s.w_mask] = s.head[s.ins_h]; - - s.head[s.ins_h] = str; - str++; - } while (--n); - s.strstart = str; - s.lookahead = MIN_MATCH - 1; - fill_window(s); - } - s.strstart += s.lookahead; - s.block_start = s.strstart; - s.insert = s.lookahead; - s.lookahead = 0; - s.match_length = s.prev_length = MIN_MATCH - 1; - s.match_available = 0; - strm.next_in = next; - strm.input = input; - strm.avail_in = avail; - s.wrap = wrap; - return Z_OK; -} - - -exports.deflateInit = deflateInit; -exports.deflateInit2 = deflateInit2; -exports.deflateReset = deflateReset; -exports.deflateResetKeep = deflateResetKeep; -exports.deflateSetHeader = deflateSetHeader; -exports.deflate = deflate; -exports.deflateEnd = deflateEnd; -exports.deflateSetDictionary = deflateSetDictionary; -exports.deflateInfo = 'pako deflate (from Nodeca project)'; - -/* Not implemented -exports.deflateBound = deflateBound; -exports.deflateCopy = deflateCopy; -exports.deflateParams = deflateParams; -exports.deflatePending = deflatePending; -exports.deflatePrime = deflatePrime; -exports.deflateTune = deflateTune; -*/ |