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https://github.com/aaru-dps/Aaru.Compression.Native.git
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76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
/*
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* bitstream.h - Bit stream input implementation
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*
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* Copyright (c) 2017-present, MacPaw Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#ifndef BITSTREAM_H
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#define BITSTREAM_H
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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typedef struct BitStream
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{
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const uint8_t *data;
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size_t length;
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size_t pos;
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uint32_t bitbuffer;
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int bitcount;
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bool eof;
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} BitStream;
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// Initialize bit stream
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void bitstream_init(BitStream *bs, const uint8_t *data, size_t length);
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// Read a single bit (MSB first)
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uint32_t bitstream_read_bit(BitStream *bs);
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// Read a single bit (LSB first)
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uint32_t bitstream_read_bit_le(BitStream *bs);
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// Read multiple bits (MSB first)
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uint32_t bitstream_read_bits(BitStream *bs, int count);
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// Read multiple bits (LSB first)
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uint32_t bitstream_read_bits_le(BitStream *bs, int count);
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// Peek at bits without consuming them (MSB first)
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uint32_t bitstream_peek_bits(BitStream *bs, int count);
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// Peek at bits without consuming them (LSB first)
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uint32_t bitstream_peek_bits_le(BitStream *bs, int count);
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// Skip previously peeked bits (MSB first)
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void bitstream_skip_bits(BitStream *bs, int count);
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// Skip previously peeked bits (LSB first)
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void bitstream_skip_bits_le(BitStream *bs, int count);
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// Read a byte
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uint8_t bitstream_read_byte(BitStream *bs);
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// Read a 16-bit little endian integer
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uint16_t bitstream_read_uint16_le(BitStream *bs);
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// Check if end of stream reached
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bool bitstream_eof(BitStream *bs);
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#endif /* BITSTREAM_H */
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