author  Ryan C. Gordon <icculus@icculus.org> 
Fri, 19 Dec 2003 01:49:12 +0000  
changeset 612  03b07cbd1bc7 
parent 602  691c1eadb8b7 
permissions  rwrr 
602
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/* inftrees.h  header to use inftrees.c 
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* Copyright (C) 19952003 Mark Adler 
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* For conditions of distribution and use, see copyright notice in zlib.h 
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*/ 
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/* WARNING: this file should *not* be used by applications. It is 
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part of the implementation of the compression library and is 
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subject to change. Applications should only use zlib.h. 
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*/ 
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/* Structure for decoding tables. Each entry provides either the 
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information needed to do the operation requested by the code that 
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indexed that table entry, or it provides a pointer to another 
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table that indexes more bits of the code. op indicates whether 
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the entry is a pointer to another table, a literal, a length or 
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distance, an endofblock, or an invalid code. For a table 
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pointer, the low four bits of op is the number of index bits of 
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that table. For a length or distance, the low four bits of op 
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is the number of extra bits to get after the code. bits is 
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the number of bits in this code or part of the code to drop off 
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of the bit buffer. val is the actual byte to output in the case 
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of a literal, the base length or distance, or the offset from 
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the current table to the next table. Each entry is four bytes. */ 
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typedef struct { 
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unsigned char op; /* operation, extra bits, table bits */ 
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unsigned char bits; /* bits in this part of the code */ 
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unsigned short val; /* offset in table or code value */ 
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} code; 
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/* op values as set by inflate_table(): 
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00000000  literal 
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0000tttt  table link, tttt != 0 is the number of table index bits 
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0001eeee  length or distance, eeee is the number of extra bits 
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01100000  end of block 
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01000000  invalid code 
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*/ 
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/* Maximum size of dynamic tree. The maximum found in a long but non 
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exhaustive search was 1004 code structures (850 for length/literals 
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and 154 for distances, the latter actually the result of an 
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exhaustive search). The true maximum is not known, but the value 
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below is more than safe. */ 
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#define ENOUGH 1440 
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#define MAXD 154 
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/* Type of code to build for inftable() */ 
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typedef enum { 
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CODES, 
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LENS, 
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DISTS 
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} codetype; 
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extern int inflate_table OF((codetype type, unsigned short FAR *lens, 
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unsigned codes, code FAR * FAR *table, 
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unsigned FAR *bits, unsigned short FAR *work)); 