45 lines
1.7 KiB
C
45 lines
1.7 KiB
C
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// defdata.h
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// Data specific to deflate
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// BUGBUG Some of these USHORTs could be made into ULONGs for speed-of-access. The disadvantage would
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// be greater memory/cache usage. g_StaticDistanceTreeCode[] could be made into a BYTE array,
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// since the codes are 5 bits. Changes of this nature will require various code changes elsewhere.
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#ifdef DECLARE_DATA
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// lookup tables for finding the slot number of a match length or distance
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BYTE g_LengthLookup[256];
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BYTE g_DistLookup[512];
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// literal codes for static blocks
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BYTE g_StaticLiteralTreeLength[MAX_LITERAL_TREE_ELEMENTS];
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USHORT g_StaticLiteralTreeCode[MAX_LITERAL_TREE_ELEMENTS];
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// distance codes for static blocks
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// note: g_StaticDistanceTreeLength == 5 for all distances, which is why we don't have a table for that
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USHORT g_StaticDistanceTreeCode[MAX_DIST_TREE_ELEMENTS];
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// cached tree structure output for fast encoder
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BYTE g_FastEncoderTreeStructureData[MAX_TREE_DATA_SIZE];
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int g_FastEncoderTreeLength; // # bytes in g_FastEncoderTreeStructureData
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ULONG g_FastEncoderPostTreeBitbuf; // final value of bitbuf
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int g_FastEncoderPostTreeBitcount; // final value of bitcount
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#else /* !DECLARE_DATA */
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extern BYTE g_LengthLookup[256];
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extern BYTE g_DistLookup[512];
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extern BYTE g_StaticLiteralTreeLength[MAX_LITERAL_TREE_ELEMENTS];
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extern USHORT g_StaticLiteralTreeCode[MAX_LITERAL_TREE_ELEMENTS];
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extern USHORT g_StaticDistanceTreeCode[MAX_DIST_TREE_ELEMENTS];
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extern BYTE g_FastEncoderTreeStructureData[MAX_TREE_DATA_SIZE];
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extern int g_FastEncoderTreeLength;
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extern ULONG g_FastEncoderPostTreeBitbuf;
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extern int g_FastEncoderPostTreeBitcount;
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#endif /* !DECLARE_DATA */
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