| /* inftrees.h -- header to use inftrees.c |
| * Copyright (C) 1995 Mark Adler |
| * For conditions of distribution and use, see copyright notice in zlib.h |
| */ |
| |
| /* WARNING: this file should *not* be used by applications. It is |
| part of the implementation of the compression library and is |
| subject to change. Applications should only use zlib.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). |
| 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 |
| |
| typedef struct inflate_huft_s inflate_huft; |
| struct inflate_huft_s { |
| union { |
| struct { |
| Char Exop; /* number of extra bits or operation */ |
| Byte Bits; /* number of bits in this code or subcode */ |
| } what; |
| Byte *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; |
| }; |
| |
| #ifdef DEBUG |
| extern uInt inflate_hufts; |
| #endif |
| |
| extern int inflate_trees_bits __P(( |
| uInt *, /* 19 code lengths */ |
| uInt *, /* bits tree desired/actual depth */ |
| inflate_huft **, /* bits tree result */ |
| z_stream *)); /* for zalloc, zfree functions */ |
| |
| extern int inflate_trees_dynamic __P(( |
| uInt, /* number of literal/length codes */ |
| uInt, /* number of distance codes */ |
| uInt *, /* that many (total) code lengths */ |
| uInt *, /* literal desired/actual bit depth */ |
| uInt *, /* distance desired/actual bit depth */ |
| inflate_huft **, /* literal/length tree result */ |
| inflate_huft **, /* distance tree result */ |
| z_stream *)); /* for zalloc, zfree functions */ |
| |
| extern int inflate_trees_fixed __P(( |
| uInt *, /* literal desired/actual bit depth */ |
| uInt *, /* distance desired/actual bit depth */ |
| inflate_huft **, /* literal/length tree result */ |
| inflate_huft **)); /* distance tree result */ |
| |
| extern int inflate_trees_free __P(( |
| inflate_huft *, /* tables to free */ |
| z_stream *)); /* for zfree function */ |
