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