/usr/include/winpr2/winpr/bitstream.h is in libwinpr2-dev 2.0.0~git20170725.1.1648deb+dfsg1-7ubuntu0.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* WinPR: Windows Portable Runtime
* BitStream Utils
*
* Copyright 2014 Marc-Andre Moreau <marcandre.moreau@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef WINPR_UTILS_BITSTREAM_H
#define WINPR_UTILS_BITSTREAM_H
#include <winpr/winpr.h>
#include <winpr/wtypes.h>
#include <winpr/crt.h>
#include <winpr/wlog.h>
struct _wBitStream
{
const BYTE* buffer;
BYTE* pointer;
UINT32 position;
UINT32 length;
UINT32 capacity;
UINT32 mask;
UINT32 offset;
UINT32 prefetch;
UINT32 accumulator;
};
typedef struct _wBitStream wBitStream;
#define BITDUMP_MSB_FIRST 0x00000001
#define BITDUMP_STDERR 0x00000002
#ifdef __cplusplus
extern "C" {
#endif
#define BitStream_Prefetch(_bs) do { \
(_bs->prefetch) = 0; \
if (((UINT32) (_bs->pointer - _bs->buffer) + 4) < (_bs->capacity)) \
(_bs->prefetch) |= (*(_bs->pointer + 4) << 24); \
if (((UINT32) (_bs->pointer - _bs->buffer) + 5) < (_bs->capacity)) \
(_bs->prefetch) |= (*(_bs->pointer + 5) << 16); \
if (((UINT32) (_bs->pointer - _bs->buffer) + 6) < (_bs->capacity)) \
(_bs->prefetch) |= (*(_bs->pointer + 6) << 8); \
if (((UINT32) (_bs->pointer - _bs->buffer) + 7) < (_bs->capacity)) \
(_bs->prefetch) |= (*(_bs->pointer + 7) << 0); \
} while(0)
#define BitStream_Fetch(_bs) do { \
(_bs->accumulator) = 0; \
if (((UINT32) (_bs->pointer - _bs->buffer) + 0) < (_bs->capacity)) \
(_bs->accumulator) |= (*(_bs->pointer + 0) << 24); \
if (((UINT32) (_bs->pointer - _bs->buffer) + 1) < (_bs->capacity)) \
(_bs->accumulator) |= (*(_bs->pointer + 1) << 16); \
if (((UINT32) (_bs->pointer - _bs->buffer) + 2) < (_bs->capacity)) \
(_bs->accumulator) |= (*(_bs->pointer + 2) << 8); \
if (((UINT32) (_bs->pointer - _bs->buffer) + 3) <(_bs->capacity)) \
(_bs->accumulator) |= (*(_bs->pointer + 3) << 0); \
BitStream_Prefetch(_bs); \
} while(0)
#define BitStream_Flush(_bs) do { \
if (((UINT32) (_bs->pointer - _bs->buffer) + 0) < (_bs->capacity)) \
*(_bs->pointer + 0) = (_bs->accumulator >> 24); \
if (((UINT32) (_bs->pointer - _bs->buffer) + 1) < (_bs->capacity)) \
*(_bs->pointer + 1) = (_bs->accumulator >> 16); \
if (((UINT32) (_bs->pointer - _bs->buffer) + 2) < (_bs->capacity)) \
*(_bs->pointer + 2) = (_bs->accumulator >> 8); \
if (((UINT32) (_bs->pointer - _bs->buffer) + 3) < (_bs->capacity)) \
*(_bs->pointer + 3) = (_bs->accumulator >> 0); \
} while(0)
#define BitStream_Shift(_bs, _nbits) do { \
if (_nbits == 0) { \
} else if ((_nbits > 0) && (_nbits < 32)) { \
_bs->accumulator <<= _nbits; \
_bs->position += _nbits; \
_bs->offset += _nbits; \
if (_bs->offset < 32) { \
_bs->mask = ((1 << _nbits) - 1); \
_bs->accumulator |= ((_bs->prefetch >> (32 - _nbits)) & _bs->mask); \
_bs->prefetch <<= _nbits; \
} else { \
_bs->mask = ((1 << _nbits) - 1); \
_bs->accumulator |= ((_bs->prefetch >> (32 - _nbits)) & _bs->mask); \
_bs->prefetch <<= _nbits; \
_bs->offset -= 32; \
_bs->pointer += 4; \
BitStream_Prefetch(_bs); \
if (_bs->offset) { \
_bs->mask = ((1 << _bs->offset) - 1); \
_bs->accumulator |= ((_bs->prefetch >> (32 - _bs->offset)) & _bs->mask); \
_bs->prefetch <<= _bs->offset; \
} \
} \
} else { \
WLog_WARN("com.winpr.bitstream", "warning: BitStream_Shift(%u)", (unsigned)_nbits); \
} \
} while(0)
#define BitStream_Shift32(_bs) do { \
BitStream_Shift(_bs, 16); \
BitStream_Shift(_bs, 16); \
} while(0)
#define BitStream_Write_Bits(_bs, _bits, _nbits) do { \
_bs->position += _nbits; \
_bs->offset += _nbits; \
if (_bs->offset < 32) { \
_bs->accumulator |= (_bits << (32 - _bs->offset)); \
} else { \
_bs->offset -= 32; \
_bs->mask = ((1 << (_nbits - _bs->offset)) - 1); \
_bs->accumulator |= ((_bits >> _bs->offset) & _bs->mask); \
BitStream_Flush(bs); \
_bs->accumulator = 0; \
_bs->pointer += 4; \
if (_bs->offset) { \
_bs->mask = ((1 << _bs->offset) - 1); \
_bs->accumulator |= ((_bits & _bs->mask) << (32 - _bs->offset)); \
} \
} \
} while(0)
#define BitStream_GetRemainingLength(_bs) \
(_bs->length - _bs->position)
WINPR_API void BitDump(const char* tag, UINT32 level, const BYTE* buffer, UINT32 length, UINT32 flags);
WINPR_API UINT32 ReverseBits32(UINT32 bits, UINT32 nbits);
WINPR_API void BitStream_Attach(wBitStream* bs, const BYTE* buffer, UINT32 capacity);
WINPR_API wBitStream* BitStream_New();
WINPR_API void BitStream_Free(wBitStream* bs);
#ifdef __cplusplus
}
#endif
#endif /* WINPR_UTILS_BITSTREAM_H */
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