56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
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/*
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* XZ decompressor - Private/internal header
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*
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* Based on xz-embedded by Lasse Collin (public domain).
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*/
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#ifndef XZ_PRIVATE_H
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#define XZ_PRIVATE_H
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#include "xz.h"
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#include <stdlib.h>
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#include <string.h>
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/* Six-byte magic at the start of every .xz stream: 0xFD, '7', 'z', 'X', 'Z', 0x00 */
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#define XZ_HEADER_MAGIC "\3757zXZ\0"
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#define XZ_HEADER_MAGIC_SIZE 6
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/* Two-byte magic in stream footer: 'Y', 'Z' */
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#define XZ_FOOTER_MAGIC "YZ"
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#define XZ_FOOTER_MAGIC_SIZE 2
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#ifndef min_t
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#define min_t(type, a, b) ((type)(a) < (type)(b) ? (type)(a) : (type)(b))
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#endif
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#ifndef max_t
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#define max_t(type, a, b) ((type)(a) > (type)(b) ? (type)(a) : (type)(b))
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#endif
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/* Get an unaligned 32-bit little-endian value */
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static inline uint32_t get_le32(const uint8_t *buf)
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{
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return (uint32_t)buf[0]
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| ((uint32_t)buf[1] << 8)
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| ((uint32_t)buf[2] << 16)
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| ((uint32_t)buf[3] << 24);
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}
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/* CRC lookup tables */
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extern uint32_t xz_crc32_table[256];
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extern uint64_t xz_crc64_table[256];
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/* CRC functions */
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uint32_t xz_crc32(const uint8_t *buf, size_t size, uint32_t crc);
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uint64_t xz_crc64(const uint8_t *buf, size_t size, uint64_t crc);
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/* LZMA2 decoder */
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struct xz_dec_lzma2;
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struct xz_dec_lzma2 *xz_dec_lzma2_create(enum xz_mode mode, uint32_t dict_max);
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enum xz_ret xz_dec_lzma2_run(struct xz_dec_lzma2 *s, struct xz_buf *b);
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enum xz_ret xz_dec_lzma2_reset(struct xz_dec_lzma2 *s, uint8_t props);
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void xz_dec_lzma2_end(struct xz_dec_lzma2 *s);
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#endif /* XZ_PRIVATE_H */
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