// $Id: zinflate.h 751 2006-03-31 15:43:49Z alex $ /* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE ================================XARAHEADERSTART=========================== Xara LX, a vector drawing and manipulation program. Copyright (C) 1993-2006 Xara Group Ltd. Copyright on certain contributions may be held in joint with their respective authors. See AUTHORS file for details. LICENSE TO USE AND MODIFY SOFTWARE ---------------------------------- This file is part of Xara LX. Xara LX is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation. Xara LX and its component source files are distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 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Xara Group Ltd, Gaddesden Place, Hemel Hempstead, HP2 6EX, UK. http://www.xara.com/ =================================XARAHEADEREND============================ */ // This class contains all the file deflating code #ifndef INC_ZIPINFLATE #define INC_ZIPINFLATE #include "zutil.h" class ZStream; /* Huffman code lookup table entry--this entry is four bytes for machines that have 16-bit pointers (e.g. PC's in the small or medium model). Valid extra bits (exop) are 0..13. exop == -64 is EOB (end of block), exop == 16 means that v is a literal, exop < 0 means that v is a pointer to the next table, which codes -exop bits, and lastly exop == -128 indicates an unused code. If a code with exop == -128 is looked up, this implies an error in the data. */ //#if defined(STDC) || defined(sgi) //typedef signed char Char; //#else typedef char Char; /* just hope that char is signed */ //#endif // ------------------------------------------------------------------------------------------ // From inftrees.h // ------------------------------------------------------------------------------------------ /* Huffman code lookup table entry--this entry is four bytes for machines that have 16-bit pointers (e.g. PC's in the small or medium model). */ typedef struct inflate_huft_s FAR inflate_huft; struct inflate_huft_s { union { struct { Byte Exop; /* number of extra bits or operation */ Byte Bits; /* number of bits in this code or subcode */ } what; Bytef *pad; /* pad structure to a power of 2 (4 bytes for */ } word; /* 16-bit, 8 bytes for 32-bit machines) */ union { uInt Base; /* literal, length base, or distance base */ inflate_huft *Next; /* pointer to next level of table */ } more; }; /******************************************************************************************** ********************************************************************************************/ /* And'ing with mask[n] masks the lower n bits */ extern uInt inflate_mask[]; // ------------------------------------------------------------------------------------------ // From inftrees.h // ------------------------------------------------------------------------------------------ /******************************************************************************************** ********************************************************************************************/ enum InflateCodesMode { /* waiting for "i:"=input, "o:"=output, "x:"=nothing */ START, /* x: set up for LEN */ LEN, /* i: get length/literal/eob next */ LENEXT, /* i: getting length extra (have base) */ DIST, /* i: get distance next */ DISTEXT, /* i: getting distance extra */ COPY, /* o: copying bytes in window, waiting for space */ LIT, /* o: got literal, waiting for output space */ WASH, /* o: got eob, possibly still output waiting */ END, /* x: got eob and all data flushed */ BADCODE /* x: got error */ }; /******************************************************************************************** > class inflate_codes_state : public CCObject Author: Neville_Humphrys (Xara Group Ltd) Humprhys Created: 23/5/95 Purpose: An inflate codes state object for use by the inflater for the file compressor and decompressor. ********************************************************************************************/ class inflate_codes_state : public CC_CLASS_MEMDUMP { // Give my name in memory dumps // If you need a different sort of decare, replace this one. // See CCObject in the help file for info about DECLARE types CC_DECLARE_MEMDUMP(inflate_codes_state); public: inflate_codes_state() {}; ~inflate_codes_state() {}; public: /* mode */ InflateCodesMode mode; /* current inflate_codes mode */ /* mode dependent information */ uInt len; union { struct { inflate_huft *tree; /* pointer into tree */ uInt need; /* bits needed */ } code; /* if LEN or DIST, where in tree */ uInt lit; /* if LIT, literal */ struct { uInt get; /* bits to get for extra */ uInt dist; /* distance back to copy from */ } copy; /* if EXT or COPY, where and how much */ } sub; /* submode */ /* mode independent information */ Byte lbits; /* ltree bits decoded per branch */ Byte dbits; /* dtree bits decoder per branch */ inflate_huft *ltree; /* literal/length/eob tree */ inflate_huft *dtree; /* distance tree */ }; // ------------------------------------------------------------------------------------------ // From infutil.h // ------------------------------------------------------------------------------------------ /******************************************************************************************** ********************************************************************************************/ enum InflateBlockMode { TYPE, /* get type bits (3, including end bit) */ LENS, /* get lengths for stored */ STORED, /* processing stored block */ TABLE, /* get table lengths */ BTREE, /* get bit lengths tree for a dynamic block */ DTREE, /* get length, distance trees for a dynamic block */ CODES, /* processing fixed or dynamic block */ DRY, /* output remaining window bytes */ BLOCKDONE,/* finished last block, done */ BLOCKBAD /* got a data error--stuck here */ }; /******************************************************************************************** > class inflate_blocks_state : public CCObject Author: Neville_Humphrys (Xara Group Ltd) Humprhys Created: 23/5/95 Purpose: An inflate blocks state object for use by the inflater for the file compressor and decompressor. ********************************************************************************************/ class inflate_blocks_state : public CC_CLASS_MEMDUMP { // Give my name in memory dumps // If you need a different sort of decare, replace this one. // See CCObject in the help file for info about DECLARE types CC_DECLARE_MEMDUMP(inflate_blocks_state); public: inflate_blocks_state() {}; ~inflate_blocks_state() {}; public: /* inflate blocks semi-private state */ InflateBlockMode mode; /* current inflate_block mode */ /* mode dependent information */ union { uInt left; /* if STORED, bytes left to copy */ struct { uInt table; /* table lengths (14 bits) */ uInt index; /* index into blens (or border) */ uInt *blens; /* bit lengths of codes */ uInt bb; /* bit length tree depth */ inflate_huft *tb; /* bit length decoding tree */ } trees; /* if DTREE, decoding info for trees */ struct { inflate_huft *tl, *td; /* trees to free */ inflate_codes_state *codes; } decode; /* if CODES, current state */ } sub; /* submode */ uInt last; /* true if this block is the last block */ /* mode independent information */ uInt bitk; /* bits in bit buffer */ uLong bitb; /* bit buffer */ Bytef *window; /* sliding window */ Bytef *end; /* one byte after sliding window */ Bytef *read; /* window read pointer */ Bytef *write; /* window write pointer */ check_func checkfn; /* check function */ uLong check; /* check on output */ }; // ------------------------------------------------------------------------------------------ // From ?.c // ------------------------------------------------------------------------------------------ /******************************************************************************************** ********************************************************************************************/ /* current inflate mode */ enum InflateMode { METHOD, /* waiting for method byte */ FLAG, /* waiting for flag byte */ DICT4, /* four dictionary check bytes to go */ DICT3, /* three dictionary check bytes to go */ DICT2, /* two dictionary check bytes to go */ DICT1, /* one dictionary check byte to go */ DICT0, /* waiting for inflateSetDictionary */ BLOCKS, /* decompressing blocks */ CHECK4, /* four check bytes to go */ CHECK3, /* three check bytes to go */ CHECK2, /* two check bytes to go */ CHECK1, /* one check byte to go */ DONE, /* finished check, done */ BAD /* got an error--stay here */ }; /******************************************************************************************** > class InflateState : public CCObject Author: Neville_Humphrys (Xara Group Ltd) Humprhys Created: 23/5/95 Purpose: An inflate state object for use by the inflater for the file compressor and decompressor. ********************************************************************************************/ class InflateState : public CC_CLASS_MEMDUMP { // Give my name in memory dumps // If you need a different sort of decare, replace this one. // See CCObject in the help file for info about DECLARE types CC_DECLARE_MEMDUMP(InflateState); public: InflateState() {}; ~InflateState() {}; public: InflateMode mode; /* current inflate mode */ /* mode dependent information */ union { uInt method; /* if FLAGS, method byte */ struct { uLong was; /* computed check value */ uLong need; /* stream check value */ } check; /* if CHECK, check values to compare */ uInt marker; /* if BAD, inflateSync's marker bytes count */ } sub; /* submode */ /* mode independent information */ INT32 nowrap; /* flag for no wrapper */ uInt wbits; /* log2(window size) (8..15, defaults to 15) */ inflate_blocks_state *blocks; /* current inflate_blocks state */ protected: }; /******************************************************************************************** > class ZipInflate : public CCObject Author: Neville_Humphrys (Xara Group Ltd) Humprhys Created: 23/5/95 Purpose: The inflater for the file compressor and decompressor. Allows the CCDiskFile to offer compression of files. At present just used to compress the native file format. ********************************************************************************************/ class ZipInflate : public CC_CLASS_MEMDUMP { // Give my name in memory dumps // If you need a different sort of decare, replace this one. // See CCObject in the help file for info about DECLARE types CC_DECLARE_MEMDUMP(ZipInflate); public: ZipInflate(); ~ZipInflate(); public: INT32 Init(ZStream *strm); INT32 inflate(ZStream *strm, INT32 flush); INT32 SetDictionary(ZStream *z, const Bytef *dictionary, uInt dictLength); INT32 End(ZStream *strm); INT32 Init(ZStream *strm, INT32 windowBits); INT32 Sync(ZStream *strm); INT32 Reset(ZStream *strm); protected: // from infutil.h // copy as much as possible from the sliding window to the output area INT32 inflate_flush(inflate_blocks_state *, ZStream *, INT32); // from infblocks.h inflate_blocks_state *inflate_blocks_new(ZStream *, check_func, uInt); INT32 inflate_blocks(inflate_blocks_state *, ZStream *, INT32); void inflate_blocks_reset(inflate_blocks_state *, ZStream *, uLongf *); INT32 inflate_blocks_free(inflate_blocks_state *, ZStream *, uLongf *); // New version 0.99 void inflate_set_dictionary( inflate_blocks_state *s, const Bytef *d, /* dictionary */ uInt n); /* dictionary length */ // from inftrees.h #ifdef DEBUG uInt inflate_hufts; #endif INT32 inflate_trees_bits( uIntf *, /* 19 code lengths */ uIntf *, /* bits tree desired/actual depth */ inflate_huft * FAR *, /* bits tree result */ ZStream *); /* for zalloc, zfree functions */ INT32 inflate_trees_dynamic( uInt, /* number of literal/length codes */ uInt, /* number of distance codes */ uIntf *, /* that many (total) code lengths */ uIntf *, /* literal desired/actual bit depth */ uIntf *, /* distance desired/actual bit depth */ inflate_huft * FAR *, /* literal/length tree result */ inflate_huft * FAR *, /* distance tree result */ ZStream *); /* for zalloc, zfree functions */ INT32 inflate_trees_fixed( uIntf *, /* literal desired/actual bit depth */ uIntf *, /* distance desired/actual bit depth */ inflate_huft * FAR *, /* literal/length tree result */ inflate_huft * FAR *); /* distance tree result */ INT32 inflate_trees_free( inflate_huft *, /* tables to free */ ZStream *); /* for zfree function */ // inftrees.c INT32 huft_build( uIntf *, /* code lengths in bits */ uInt, /* number of codes */ uInt, /* number of "simple" codes */ uIntf *, /* list of base values for non-simple codes */ uIntf *, /* list of extra bits for non-simple codes */ inflate_huft * FAR*,/* result: starting table */ uIntf *, /* maximum lookup bits (returns actual) */ ZStream *); /* for zalloc function */ //voidpf falloc( // voidpf, /* opaque pointer (not used) */ // uInt, /* number of items */ // uInt); /* size of item */ // from inffast.h INT32 inflate_fast(uInt, uInt, inflate_huft *, inflate_huft *, inflate_blocks_state *, ZStream *); // from infcodes.h inflate_codes_state *inflate_codes_new( uInt, uInt, inflate_huft *, inflate_huft *, ZStream *); INT32 inflate_codes(inflate_blocks_state *, ZStream *, INT32); void inflate_codes_free(inflate_codes_state *, ZStream *); }; #endif // INC_ZIPINFLATE