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serializer.h
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serializer.h
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/*
*
* Copyright (c) 2021, Joel
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef __SERIALIZER_H_
#define __SERIALIZER_H_
#ifdef __cplusplus
extern "C" {
#endif
#include <stdlib.h>
#define swap_8 /* do nothing */
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ /* swap to little-endian */
#if defined(__APPLE__)
#include <libkern/OSByteOrder.h>
#define swap_16 OSSwapInt16
#define swap_32 OSSwapInt32
#define swap_64 OSSwapInt64
#else
#include <byteswap.h>
#define swap_16 bswap_16
#define swap_32 bswap_32
#define swap_64 bswap_64
#endif
#elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ /* already little-endian, do nothing */
#define swap_16
#define swap_32
#define swap_64
#else
#error unknow endian
#endif
#define DEFINE_NUM_SWAPPING(T) \
static T swapping_##T(T value)__attribute__((unused)); \
static T swapping_##T(T value){ \
T res = 0; \
switch ( sizeof(T) ) { \
case 1: *(uint8_t*)&res = swap_8(*(uint8_t*)&value); break; \
case 2: *(uint16_t*)&res = swap_16(*(uint16_t*)&value); break; \
case 4: *(uint32_t*)&res = swap_32(*(uint32_t*)&value); break; \
case 8: *(uint64_t*)&res = swap_64(*(uint64_t*)&value); break; \
default: return 0; \
} \
return res; \
}
DEFINE_NUM_SWAPPING(int8_t)
DEFINE_NUM_SWAPPING(uint8_t)
DEFINE_NUM_SWAPPING(int16_t)
DEFINE_NUM_SWAPPING(uint16_t)
DEFINE_NUM_SWAPPING(int32_t)
DEFINE_NUM_SWAPPING(uint32_t)
DEFINE_NUM_SWAPPING(int64_t)
DEFINE_NUM_SWAPPING(uint64_t)
DEFINE_NUM_SWAPPING(float)
DEFINE_NUM_SWAPPING(double)
#define SERIALIZER_OK 0
#define SERIALIZER_ERR -1
struct serializer{
char *buf;
size_t buf_len;
off_t offset;
};
#define SERIALIZER_INIT(len) \
((struct serializer){ \
.buf = (char[(len)]){}, \
.buf_len = (len), \
.offset = 0 \
})
#define SERIALIZER_READ_BYTES(ser,res,len) \
({ \
off_t start = (ser).offset; \
if ((uintptr_t)NULL != (uintptr_t)((ser).buf) && \
(uintptr_t)NULL != (uintptr_t)(res) && \
0 < (len) && \
(ser).offset + (len) <= (ser).buf_len){ \
memcpy((res), (ser).buf + (ser).offset, (len)); \
(ser).offset += (len); \
} \
(len) == (ser).offset - start ? SERIALIZER_OK : SERIALIZER_ERR; \
})
#define SERIALIZER_WRITE_BYTES(ser,val,len) \
({ \
off_t start = (ser).offset; \
if ((uintptr_t)NULL != (uintptr_t)((ser).buf) && \
(uintptr_t)NULL != (uintptr_t)(val) && \
0 < (len) && \
(ser).offset + (len) <= (ser).buf_len){ \
memcpy((ser).buf + (ser).offset, (val), (len)); \
(ser).offset += (len); \
} \
(len) == (ser).offset - start ? SERIALIZER_OK : SERIALIZER_ERR; \
})
#define SERIALIZER_SKIP_BYTES(ser,len) \
({ \
off_t start = (ser).offset; \
if ((uintptr_t)NULL != (uintptr_t)((ser).buf) && \
0 < (len) && \
(ser).offset + (len) <= (ser).buf_len){ \
(ser).offset += (len); \
} \
(len) == (ser).offset - start ? SERIALIZER_OK : SERIALIZER_ERR; \
})
#define SERIALIZER_READ_NUM(ser,res,type) \
({ \
type val_tmp; \
int opr = SERIALIZER_READ_BYTES((ser), &val_tmp, sizeof(type)); \
if(SERIALIZER_OK == opr){ \
(res) = swapping_##type(val_tmp); \
} \
opr; \
})
#define SERIALIZER_WRITE_NUM(ser,val,type) \
({ \
type val_tmp = swapping_##type((type)(val)); \
SERIALIZER_WRITE_BYTES((ser), &val_tmp, sizeof(type)); \
})
#define SERIALIZER_READ_STR(ser,res,len) \
({ \
SERIALIZER_READ_BYTES((ser), (res), (len)); \
})
#define SERIALIZER_READ_NEW_STR(ser,res,len) \
({ \
(res) = calloc(1, (len) + 1); \
SERIALIZER_READ_BYTES((ser), (res), (len)); \
})
#define SERIALIZER_WRITE_STR(ser,val,len) \
({ \
SERIALIZER_WRITE_BYTES((ser), (val), (len)); \
})
#ifdef __cplusplus
}
#endif
#endif