mirror of
https://gitee.com/Vancouver2017/luban-lite-t3e-pro.git
synced 2025-12-15 02:48:54 +00:00
84 lines
2.1 KiB
C
84 lines
2.1 KiB
C
/*
|
|
* Copyright (C) 2020-2022 Artinchip Technology Co. Ltd
|
|
*
|
|
* author: <qi.xu@artinchip.com>
|
|
* Desc: byte stream reader
|
|
*
|
|
*/
|
|
|
|
#ifndef BYTESTREAM_H
|
|
#define BYTESTREAM_H
|
|
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
#include "mpp_log.h"
|
|
|
|
typedef struct get_byte_ctx {
|
|
const uint8_t *buffer;
|
|
const uint8_t *buffer_end;
|
|
const uint8_t *buffer_start;
|
|
} get_byte_ctx;
|
|
|
|
static inline void bytestream2_init(get_byte_ctx *g,
|
|
const uint8_t *buf,
|
|
int buf_size)
|
|
{
|
|
g->buffer = buf;
|
|
g->buffer_start = buf;
|
|
g->buffer_end = buf + buf_size;
|
|
}
|
|
|
|
static inline unsigned int bytestream2_get_byte(get_byte_ctx *g)
|
|
{
|
|
const uint8_t* ptr = g->buffer;
|
|
g->buffer += 1;
|
|
return ptr[0];
|
|
}
|
|
|
|
static inline unsigned int bytestream2_get_be32(get_byte_ctx *g)
|
|
{
|
|
const uint8_t* ptr = g->buffer;
|
|
g->buffer += 4;
|
|
return ((unsigned int)ptr[0] << 24) |
|
|
((unsigned int)ptr[1] << 16) |
|
|
((unsigned int)ptr[2] << 8) |
|
|
(unsigned int)ptr[3];
|
|
}
|
|
|
|
static inline uint64_t bytestream2_get_be64(get_byte_ctx *g)
|
|
{
|
|
const uint8_t* ptr = g->buffer;
|
|
g->buffer += 8;
|
|
return ((uint64_t)ptr[0] << 56) | ((uint64_t)ptr[1] << 48) |
|
|
((uint64_t)ptr[2] << 40) | ((uint64_t)ptr[3] << 32) |
|
|
((uint64_t)ptr[4] << 24) | ((uint64_t)ptr[5] << 16) |
|
|
((uint64_t)ptr[6] << 8) | ((uint64_t)ptr[7]);
|
|
}
|
|
|
|
static inline unsigned int bytestream2_get_le32(get_byte_ctx *g)
|
|
{
|
|
const uint8_t* ptr = g->buffer;
|
|
g->buffer += 4;
|
|
return ((unsigned int)ptr[3] << 24) | ((unsigned int)ptr[2] << 16) |
|
|
((unsigned int)ptr[1] << 8) | (unsigned int)ptr[0];
|
|
}
|
|
|
|
static inline unsigned int bytestream2_get_bytes_left(get_byte_ctx *g)
|
|
{
|
|
return g->buffer_end - g->buffer;
|
|
}
|
|
|
|
static inline void bytestream2_skip(get_byte_ctx *g,
|
|
unsigned int size)
|
|
{
|
|
int left = g->buffer_end - g->buffer;
|
|
g->buffer += left < size ? left : size;
|
|
}
|
|
|
|
static inline int bytestream2_tell(get_byte_ctx *g)
|
|
{
|
|
return (int)(g->buffer - g->buffer_start);
|
|
}
|
|
|
|
#endif /* BYTESTREAM_H */
|