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Diffstat (limited to 'deps/libchdr/bitstream.h')
| -rw-r--r-- | deps/libchdr/bitstream.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/deps/libchdr/bitstream.h b/deps/libchdr/bitstream.h new file mode 100644 index 0000000..9250d33 --- /dev/null +++ b/deps/libchdr/bitstream.h @@ -0,0 +1,42 @@ +// license:BSD-3-Clause
+// copyright-holders:Aaron Giles
+/***************************************************************************
+
+ bitstream.h
+
+ Helper classes for reading/writing at the bit level.
+
+***************************************************************************/
+
+#pragma once
+
+#ifndef __BITSTREAM_H__
+#define __BITSTREAM_H__
+
+#include <stdint.h>
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// helper class for reading from a bit buffer
+struct bitstream
+{
+ uint32_t buffer; // current bit accumulator
+ int bits; // number of bits in the accumulator
+ const uint8_t * read; // read pointer
+ uint32_t doffset; // byte offset within the data
+ uint32_t dlength; // length of the data
+};
+
+struct bitstream* create_bitstream(const void *src, uint32_t srclength);
+int bitstream_overflow(struct bitstream* bitstream);
+uint32_t bitstream_read_offset(struct bitstream* bitstream);
+
+uint32_t bitstream_read(struct bitstream* bitstream, int numbits);
+uint32_t bitstream_peek(struct bitstream* bitstream, int numbits);
+void bitstream_remove(struct bitstream* bitstream, int numbits);
+uint32_t bitstream_flush(struct bitstream* bitstream);
+
+
+#endif
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