FreeRDP/include/freerdp/utils/stream.h

/**
 * FreeRDP: A Remote Desktop Protocol Client
 * Stream Utils
 *
 * Copyright 2009-2011 Jay Sorg
 * Copyright 2011 Vic Lee
 *
 * 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 __STREAM_UTILS_H
#define __STREAM_UTILS_H

#include <string.h>
#include <freerdp/types/base.h>

struct _STREAM
{
	int size;
	uint8 * p;
	uint8 * data;
};
typedef struct _STREAM STREAM;

STREAM *
stream_new(int size);
STREAM *
stream_new_empty();
void
stream_free(STREAM * stream);

void
stream_extend(STREAM * stream);
#define stream_check_size(_s,_n) \
	while (_s->p - _s->data + (_n) > _s->size) \
		stream_extend(_s)

#define stream_get_pos(_s) (_s->p - _s->data)
#define stream_set_pos(_s,_m) _s->p = _s->data + (_m)
#define stream_seek(_s,_offset) _s->p += (_offset)
#define stream_rewind(_s,_offset) _s->p -= (_offset)
#define stream_get_mark(_s,_mark) _mark = _s->p
#define stream_set_mark(_s,_mark) _s->p = _mark
#define stream_get_head(_s) _s->data
#define stream_get_tail(_s) _s->p
#define stream_get_length(_s) (_s->p - _s->data)

#define stream_read_uint8(_s, _v) do { _v = *_s->p++; } while (0)
#define stream_read_uint16(_s, _v) do { _v = \
	(uint16)(*_s->p) + \
	(((uint16)(*(_s->p + 1))) << 8); \
	_s->p += 2; } while (0)
#define stream_read_uint32(_s, _v) do { _v = \
	(uint32)(*_s->p) + \
	(((uint32)(*(_s->p + 1))) << 8) + \
	(((uint32)(*(_s->p + 2))) << 16) + \
	(((uint32)(*(_s->p + 3))) << 24); \
	_s->p += 4; } while (0)
#define stream_read_uint64(_s, _v) do { _v = \
	(uint64)(*_s->p) + \
	(((uint64)(*(_s->p + 1))) << 8) + \
	(((uint64)(*(_s->p + 2))) << 16) + \
	(((uint64)(*(_s->p + 3))) << 24) + \
	(((uint64)(*(_s->p + 4))) << 32) + \
	(((uint64)(*(_s->p + 5))) << 40) + \
	(((uint64)(*(_s->p + 6))) << 48) + \
	(((uint64)(*(_s->p + 7))) << 56); \
	_s->p += 8; } while (0)

#define stream_write_uint8(_s, _v) do { \
	*_s->p++ = (uint8)(_v); } while (0)
#define stream_write_uint16(_s, _v) do { \
	*_s->p++ = (_v) & 0xFF; \
	*_s->p++ = ((_v) >> 8) & 0xFF; } while (0)
#define stream_write_uint32(_s, _v) do { \
	*_s->p++ = (_v) & 0xFF; \
	*_s->p++ = ((_v) >> 8) & 0xFF; \
	*_s->p++ = ((_v) >> 16) & 0xFF; \
	*_s->p++ = ((_v) >> 24) & 0xFF; } while (0)
#define stream_write_uint64(_s, _v) do { \
	*_s->p++ = (_v) & 0xFF; \
	*_s->p++ = ((_v) >> 8) & 0xFF; \
	*_s->p++ = ((_v) >> 16) & 0xFF; \
	*_s->p++ = ((_v) >> 24) & 0xFF; \
	*_s->p++ = ((_v) >> 32) & 0xFF; \
	*_s->p++ = ((_v) >> 40) & 0xFF; \
	*_s->p++ = ((_v) >> 48) & 0xFF; \
	*_s->p++ = ((_v) >> 56) & 0xFF; } while (0)
#define stream_write(_s, _b, _n) do { \
	memcpy(_s->p, (_b), (_n)); \
	_s->p += (_n); \
	} while (0)
#define stream_write_padding(_s, _n) do { \
	memset(_s->p, '\0', (_n)); \
	_s->p += (_n); \
	} while (0)

#define stream_peek_uint8(_s, _v) do { _v = *_s->p; } while (0)
#define stream_peek_uint16(_s, _v) do { _v = \
	(uint16)(*_s->p) + \
	(((uint16)(*(_s->p + 1))) << 8); \
	} while (0)
#define stream_peek_uint32(_s, _v) do { _v = \
	(uint32)(*_s->p) + \
	(((uint32)(*(_s->p + 1))) << 8) + \
	(((uint32)(*(_s->p + 2))) << 16) + \
	(((uint32)(*(_s->p + 3))) << 24); \
	} while (0)
#define stream_peek_uint64(_s, _v) do { _v = \
	(uint64)(*_s->p) + \
	(((uint64)(*(_s->p + 1))) << 8) + \
	(((uint64)(*(_s->p + 2))) << 16) + \
	(((uint64)(*(_s->p + 3))) << 24) + \
	(((uint64)(*(_s->p + 4))) << 32) + \
	(((uint64)(*(_s->p + 5))) << 40) + \
	(((uint64)(*(_s->p + 6))) << 48) + \
	(((uint64)(*(_s->p + 7))) << 56); \
	} while (0)

#define stream_read_uint16_be(_s, _v) do { _v = \
	(((uint16)(*_s->p)) << 8) + \
	(uint16)(*(_s->p + 1)); \
	_s->p += 2; } while (0)

#define stream_write_uint16_be(_s, _v) do { \
	*_s->p++ = ((_v) >> 8) & 0xFF; \
	*_s->p++ = (_v) & 0xFF; } while (0)

#define stream_copy(_dst, _src, _n) do { \
	memcpy(_dst->p, _src->p, _n); \
	_dst->p += _n; \
	_src->p += _n; \
	} while (0)

#endif /* __STREAM_UTILS_H */