1*c9431fa1Sahl /* inftrees.h -- header to use inftrees.c 2*c9431fa1Sahl * Copyright (C) 1995-2005 Mark Adler 37c478bd9Sstevel@tonic-gate * For conditions of distribution and use, see copyright notice in zlib.h 47c478bd9Sstevel@tonic-gate */ 57c478bd9Sstevel@tonic-gate 67c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 77c478bd9Sstevel@tonic-gate 8*c9431fa1Sahl /* WARNING: this file should *not* be used by applications. It is 9*c9431fa1Sahl part of the implementation of the compression library and is 10*c9431fa1Sahl subject to change. Applications should only use zlib.h. 11*c9431fa1Sahl */ 127c478bd9Sstevel@tonic-gate 13*c9431fa1Sahl /* Structure for decoding tables. Each entry provides either the 14*c9431fa1Sahl information needed to do the operation requested by the code that 15*c9431fa1Sahl indexed that table entry, or it provides a pointer to another 16*c9431fa1Sahl table that indexes more bits of the code. op indicates whether 17*c9431fa1Sahl the entry is a pointer to another table, a literal, a length or 18*c9431fa1Sahl distance, an end-of-block, or an invalid code. For a table 19*c9431fa1Sahl pointer, the low four bits of op is the number of index bits of 20*c9431fa1Sahl that table. For a length or distance, the low four bits of op 21*c9431fa1Sahl is the number of extra bits to get after the code. bits is 22*c9431fa1Sahl the number of bits in this code or part of the code to drop off 23*c9431fa1Sahl of the bit buffer. val is the actual byte to output in the case 24*c9431fa1Sahl of a literal, the base length or distance, or the offset from 25*c9431fa1Sahl the current table to the next table. Each entry is four bytes. */ 26*c9431fa1Sahl typedef struct { 27*c9431fa1Sahl unsigned char op; /* operation, extra bits, table bits */ 28*c9431fa1Sahl unsigned char bits; /* bits in this part of the code */ 29*c9431fa1Sahl unsigned short val; /* offset in table or code value */ 30*c9431fa1Sahl } code; 317c478bd9Sstevel@tonic-gate 32*c9431fa1Sahl /* op values as set by inflate_table(): 33*c9431fa1Sahl 00000000 - literal 34*c9431fa1Sahl 0000tttt - table link, tttt != 0 is the number of table index bits 35*c9431fa1Sahl 0001eeee - length or distance, eeee is the number of extra bits 36*c9431fa1Sahl 01100000 - end of block 37*c9431fa1Sahl 01000000 - invalid code 38*c9431fa1Sahl */ 397c478bd9Sstevel@tonic-gate 407c478bd9Sstevel@tonic-gate /* Maximum size of dynamic tree. The maximum found in a long but non- 41*c9431fa1Sahl exhaustive search was 1444 code structures (852 for length/literals 42*c9431fa1Sahl and 592 for distances, the latter actually the result of an 43*c9431fa1Sahl exhaustive search). The true maximum is not known, but the value 44*c9431fa1Sahl below is more than safe. */ 45*c9431fa1Sahl #define ENOUGH 2048 46*c9431fa1Sahl #define MAXD 592 477c478bd9Sstevel@tonic-gate 48*c9431fa1Sahl /* Type of code to build for inftable() */ 49*c9431fa1Sahl typedef enum { 50*c9431fa1Sahl CODES, 51*c9431fa1Sahl LENS, 52*c9431fa1Sahl DISTS 53*c9431fa1Sahl } codetype; 547c478bd9Sstevel@tonic-gate 55*c9431fa1Sahl extern int inflate_table OF((codetype type, unsigned short FAR *lens, 56*c9431fa1Sahl unsigned codes, code FAR * FAR *table, 57*c9431fa1Sahl unsigned FAR *bits, unsigned short FAR *work)); 58