51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
/**
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libsmacker - A C library for decoding .smk Smacker Video files
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Copyright (C) 2012-2017 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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/** Bitstream structure, Forward declaration */
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struct smk_bit_t;
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/* BITSTREAM Functions */
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/** Initialize a bitstream */
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struct smk_bit_t* smk_bs_init(const unsigned char* b, unsigned long size);
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/** This macro checks return code from _smk_bs_read_1 and
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jumps to error label if problems occur. */
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#define smk_bs_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_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* bs);
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/** This macro checks return code from _smk_bs_read_8 and
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jumps to error label if problems occur. */
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#define smk_bs_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_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* bs);
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#endif
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