mirror of
https://github.com/jmarshall23/CnC_Remastered_Collection.git
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Justin Marshall
64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
/*
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libsmacker - A C library for decoding .smk Smacker Video files
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Copyright (C) 2012-2013 Greg Kennedy
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See smacker.h for more information.
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smk_bitstream.h
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SMK bitstream structure. Presents a block of raw bytes one
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bit at a time, and protects against over-read.
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*/
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#ifndef SMK_BITSTREAM_H
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#define SMK_BITSTREAM_H
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/*
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Bitstream structure
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Pointer to raw block of data and a size limit.
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Maintains internal pointers to byte_num and bit_number.
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*/
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struct smk_bit_t
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{
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unsigned char *bitstream;
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unsigned long size;
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unsigned long byte_num;
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char bit_num;
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};
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/* BITSTREAM Functions */
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/* Initialize a bitstream */
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struct smk_bit_t *smk_bs_init(unsigned char *, const unsigned long);
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/* Align the bitstream to next-byte boundary. */
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/* As it turns out, this isn't needed. */
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/* void smk_bs_align(struct smk_bit_t *); */
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/* This macro interrogates return code from bs_read_1 and
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jumps to error label if problems occur. */
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#define smk_bs_safe_read_1(t,uc) \
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{ \
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if ((char)(uc = smk_bs_read_1(t)) < 0) \
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{ \
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fprintf(stderr,"libsmacker::smk_bs_safe_read_1(" #t "," #uc ") - ERROR (file: %s, line: %lu)\n", __FILE__, (unsigned long)__LINE__); \
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goto error; \
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} \
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}
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/* Read a single bit from the bitstream, and advance.
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Returns -1 on error. */
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char smk_bs_read_1(struct smk_bit_t *);
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#define smk_bs_safe_read_8(t,s) \
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{ \
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if ((short)(s = smk_bs_read_8(t)) < 0) \
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{ \
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fprintf(stderr,"libsmacker::smk_bs_safe_read_8(" #t "," #s ") - ERROR (file: %s, line: %lu)\n", __FILE__, (unsigned long)__LINE__); \
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goto error; \
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} \
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}
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/* Read eight bits from the bitstream (one byte), and advance.
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Returns -1 on error. */
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short smk_bs_read_8(struct smk_bit_t *);
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#endif
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