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file reader support custom IO

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lifegpc
2022-01-07 21:59:30 +08:00
parent a8705ecb0f
commit 44c7d3b589
2 changed files with 56 additions and 12 deletions
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14
file_reader.h
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@@ -1,11 +1,15 @@
#ifndef _UTILS_FILE_READER_H
#define _UTILS_FILE_READER_H
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#if __cplusplus
extern "C" {
#endif
typedef struct file_reader_file file_reader_file;
typedef size_t(*file_reader_file_read)(void* f, size_t buf_len, char* buf);
typedef int(*file_reader_file_seek)(void* f, int64_t offset, int origin);
typedef int64_t(*file_reader_file_tell)(void* f);
/**
* @brief Create a reader from a stream
* @param f File stream
@@ -13,6 +17,16 @@ typedef struct file_reader_file file_reader_file;
* @return the reader, NULL if OOM or stream is NULL.
*/
file_reader_file* create_file_reader(FILE* f, unsigned char endian);
/**
* @brief Create a reader from a custom IO stream
* @param f The data to pass to function
* @param read The read function. Must not be NULL.
* @param seek The seek function. Must not be NULL.
* @param tell The tell function. Must not be NULL.
* @param endian 0 if little endian otherwise big endian
* @return the reader, NULL if OOM or any parameters is NULL.
*/
file_reader_file* create_file_reader2(void* f, file_reader_file_read read, file_reader_file_seek seek, file_reader_file_tell tell, unsigned char endian);
/**
* @brief Free a reader. This will not close stream.
* @param f the pointer to reader struct