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Diffstat (limited to 'lib/zlib_inflate/inftrees.h')
| -rw-r--r-- | lib/zlib_inflate/inftrees.h | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/lib/zlib_inflate/inftrees.h b/lib/zlib_inflate/inftrees.h new file mode 100644 index 00000000000..e37705adc00 --- /dev/null +++ b/lib/zlib_inflate/inftrees.h @@ -0,0 +1,64 @@ +/* inftrees.h -- header to use inftrees.c + * Copyright (C) 1995-1998 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). */ + +#ifndef _INFTREES_H +#define _INFTREES_H + +typedef struct inflate_huft_s 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; + uInt pad; /* pad structure to a power of 2 (4 bytes for */ + } word; /* 16-bit, 8 bytes for 32-bit int's) */ + uInt base; /* literal, length base, distance base, + or table offset */ +}; + +/* Maximum size of dynamic tree. The maximum found in a long but non- + exhaustive search was 1004 huft structures (850 for length/literals + and 154 for distances, the latter actually the result of an + exhaustive search). The actual maximum is not known, but the + value below is more than safe. */ +#define MANY 1440 + +extern int zlib_inflate_trees_bits ( + uInt *, /* 19 code lengths */ + uInt *, /* bits tree desired/actual depth */ + inflate_huft **, /* bits tree result */ + inflate_huft *, /* space for trees */ + z_streamp); /* for messages */ + +extern int zlib_inflate_trees_dynamic ( + 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 */ + inflate_huft *, /* space for trees */ + z_streamp); /* for messages */ + +extern int zlib_inflate_trees_fixed ( + uInt *, /* literal desired/actual bit depth */ + uInt *, /* distance desired/actual bit depth */ + inflate_huft **, /* literal/length tree result */ + inflate_huft **, /* distance tree result */ + inflate_huft *, /* space for trees */ + z_streamp); /* for memory allocation */ + +#endif /* _INFTREES_H */ |