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Diffstat (limited to '')
| -rw-r--r-- | inftrees.h | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/inftrees.h b/inftrees.h new file mode 100644 index 0000000..6001a4e --- /dev/null +++ b/inftrees.h | |||
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| 1 | /* inftrees.h -- header to use inftrees.c | ||
| 2 | * Copyright (C) 1995 Mark Adler | ||
| 3 | * For conditions of distribution and use, see copyright notice in zlib.h | ||
| 4 | */ | ||
| 5 | |||
| 6 | /* WARNING: this file should *not* be used by applications. It is | ||
| 7 | part of the implementation of the compression library and is | ||
| 8 | subject to change. Applications should only use zlib.h. | ||
| 9 | */ | ||
| 10 | |||
| 11 | /* Huffman code lookup table entry--this entry is four bytes for machines | ||
| 12 | that have 16-bit pointers (e.g. PC's in the small or medium model). | ||
| 13 | Valid extra bits (exop) are 0..13. exop == -64 is EOB (end of block), | ||
| 14 | exop == 16 means that v is a literal, exop < 0 means that v is a pointer | ||
| 15 | to the next table, which codes -exop bits, and lastly exop == -128 | ||
| 16 | indicates an unused code. If a code with exop == -128 is looked up, | ||
| 17 | this implies an error in the data. */ | ||
| 18 | |||
| 19 | typedef struct inflate_huft_s inflate_huft; | ||
| 20 | struct inflate_huft_s { | ||
| 21 | union { | ||
| 22 | struct { | ||
| 23 | char Exop; /* number of extra bits or operation */ | ||
| 24 | char Bits; /* number of bits in this code or subcode */ | ||
| 25 | } what; | ||
| 26 | Byte *pad; /* pad structure to a power of 2 (4 bytes for */ | ||
| 27 | } word; /* 16-bit, 8 bytes for 32-bit machines) */ | ||
| 28 | union { | ||
| 29 | uInt Base; /* literal, length base, or distance base */ | ||
| 30 | inflate_huft *Next; /* pointer to next level of table */ | ||
| 31 | } more; | ||
| 32 | }; | ||
| 33 | |||
| 34 | #ifdef DEBUG | ||
| 35 | extern uInt inflate_hufts; | ||
| 36 | #endif | ||
| 37 | |||
| 38 | extern int inflate_trees_bits __P(( | ||
| 39 | uInt *, /* 19 code lengths */ | ||
| 40 | uInt *, /* bits tree desired/actual depth */ | ||
| 41 | inflate_huft **, /* bits tree result */ | ||
| 42 | z_stream *)); /* for zalloc, zfree functions */ | ||
| 43 | |||
| 44 | extern int inflate_trees_dynamic __P(( | ||
| 45 | uInt, /* number of literal/length codes */ | ||
| 46 | uInt, /* number of distance codes */ | ||
| 47 | uInt *, /* that many (total) code lengths */ | ||
| 48 | uInt *, /* literal desired/actual bit depth */ | ||
| 49 | uInt *, /* distance desired/actual bit depth */ | ||
| 50 | inflate_huft **, /* literal/length tree result */ | ||
| 51 | inflate_huft **, /* distance tree result */ | ||
| 52 | z_stream *)); /* for zalloc, zfree functions */ | ||
| 53 | |||
| 54 | extern int inflate_trees_fixed __P(( | ||
| 55 | uInt *, /* literal desired/actual bit depth */ | ||
| 56 | uInt *, /* distance desired/actual bit depth */ | ||
| 57 | inflate_huft **, /* literal/length tree result */ | ||
| 58 | inflate_huft **)); /* distance tree result */ | ||
| 59 | |||
| 60 | extern int inflate_trees_free __P(( | ||
| 61 | inflate_huft *, /* tables to free */ | ||
| 62 | z_stream *)); /* for zfree function */ | ||