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38 lines
1.2 KiB
C
38 lines
1.2 KiB
C
#ifndef ENCODE_DF_H
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#define ENCODE_DF_H
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#include <stdint.h>
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#include "igzip_lib.h"
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#include "huff_codes.h"
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/* Deflate Intermediate Compression Format */
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#define LIT_LEN_BIT_COUNT 10
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#define LIT_LEN_MASK ((1 << LIT_LEN_BIT_COUNT) - 1)
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#define DIST_LIT_BIT_COUNT 9
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#define DIST_LIT_MASK ((1 << DIST_LIT_BIT_COUNT) - 1)
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#define ICF_DIST_OFFSET LIT_LEN_BIT_COUNT
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#define NULL_DIST_SYM 30
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#define LEN_START ISAL_DEF_LIT_SYMBOLS
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#define LEN_OFFSET (LEN_START - ISAL_DEF_MIN_MATCH)
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#define LEN_MAX (LEN_OFFSET + ISAL_DEF_MAX_MATCH)
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#define LIT_START (NULL_DIST_SYM + 1)
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#define ICF_CODE_LEN 32
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struct deflate_icf {
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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uint32_t lit_len : LIT_LEN_BIT_COUNT;
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uint32_t lit_dist : DIST_LIT_BIT_COUNT;
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uint32_t dist_extra : ICF_CODE_LEN - DIST_LIT_BIT_COUNT - ICF_DIST_OFFSET;
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#else
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uint32_t dist_extra : ICF_CODE_LEN - DIST_LIT_BIT_COUNT - ICF_DIST_OFFSET;
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uint32_t lit_dist : DIST_LIT_BIT_COUNT;
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uint32_t lit_len : LIT_LEN_BIT_COUNT;
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#endif
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};
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struct deflate_icf *
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encode_deflate_icf(struct deflate_icf *next_in, struct deflate_icf *end_in, struct BitBuf2 *bb,
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struct hufftables_icf *hufftables);
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#endif
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