obs-studio/libobs/util/serializer.h

165 lines
3.7 KiB
C

/*
* Copyright (c) 2013 Hugh Bailey <obs.jim@gmail.com>
*
* Permission to use, copy, modify, and 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" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#pragma once
#include "c99defs.h"
/*
* General programmable serialization functions. (A shared interface to
* various reading/writing to/from different inputs/outputs)
*/
#ifdef __cplusplus
extern "C" {
#endif
enum serialize_seek_type {
SERIALIZE_SEEK_START,
SERIALIZE_SEEK_CURRENT,
SERIALIZE_SEEK_END
};
struct serializer {
void *data;
size_t (*read)(void *, void *, size_t);
size_t (*write)(void *, const void *, size_t);
int64_t (*seek)(void *, int64_t, enum serialize_seek_type);
int64_t (*get_pos)(void *);
};
static inline size_t s_read(struct serializer *s, void *data, size_t size)
{
if (s && s->read && data && size)
return s->read(s->data, (void*)data, size);
return 0;
}
static inline size_t s_write(struct serializer *s, const void *data,
size_t size)
{
if (s && s->write && data && size)
return s->write(s->data, (void*)data, size);
return 0;
}
static inline size_t serialize(struct serializer *s, void *data, size_t len)
{
if (s) {
if (s->write)
return s->write(s->data, data, len);
else if (s->read)
return s->read(s->data, data, len);
}
return 0;
}
static inline int64_t serializer_seek(struct serializer *s, int64_t offset,
enum serialize_seek_type seek_type)
{
if (s && s->seek)
return s->seek(s->data, offset, seek_type);
return -1;
}
static inline int64_t serializer_get_pos(struct serializer *s)
{
if (s && s->get_pos)
return s->get_pos(s->data);
return -1;
}
/* formatted this to be similar to the AVIO layout that ffmpeg uses */
static inline void s_w8(struct serializer *s, uint8_t u8)
{
s_write(s, &u8, sizeof(uint8_t));
}
static inline void s_wl16(struct serializer *s, uint16_t u16)
{
s_w8(s, (uint8_t)u16);
s_w8(s, u16 >> 8);
}
static inline void s_wl24(struct serializer *s, uint32_t u24)
{
s_w8 (s, (uint8_t)u24);
s_wl16(s, (uint16_t)(u24 >> 8));
}
static inline void s_wl32(struct serializer *s, uint32_t u32)
{
s_wl16(s, (uint16_t)u32);
s_wl16(s, (uint16_t)(u32 >> 16));
}
static inline void s_wl64(struct serializer *s, uint64_t u64)
{
s_wl32(s, (uint32_t)u64);
s_wl32(s, (uint32_t)(u64 >> 32));
}
static inline void s_wlf(struct serializer *s, float f)
{
s_wl32(s, *(uint32_t*)&f);
}
static inline void s_wld(struct serializer *s, double d)
{
s_wl64(s, *(uint64_t*)&d);
}
static inline void s_wb16(struct serializer *s, uint16_t u16)
{
s_w8(s, u16 >> 8);
s_w8(s, (uint8_t)u16);
}
static inline void s_wb24(struct serializer *s, uint32_t u24)
{
s_wb16(s, (uint16_t)(u24 >> 8));
s_w8 (s, (uint8_t)u24);
}
static inline void s_wb32(struct serializer *s, uint32_t u32)
{
s_wb16(s, (uint16_t)(u32 >> 16));
s_wb16(s, (uint16_t)u32);
}
static inline void s_wb64(struct serializer *s, uint64_t u64)
{
s_wb32(s, (uint32_t)(u64 >> 32));
s_wb32(s, (uint32_t)u64);
}
static inline void s_wbf(struct serializer *s, float f)
{
s_wb32(s, *(uint32_t*)&f);
}
static inline void s_wbd(struct serializer *s, double d)
{
s_wb64(s, *(uint64_t*)&d);
}
#ifdef __cplusplus
}
#endif