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【C】文件读写接口

作者: / 发布于2014/5/22/ 479


	#ifndef __STREAM_H__
	#define __STREAM_H__

	// 类型定义.
	#ifndef _STDINT_H
	typedef signed char int8_t;
	typedef unsigned char uint8_t;
	typedef short int16_t;
	typedef unsigned short uint16_t;
	typedef int int32_t;
	typedef unsigned uint32_t;
	typedef long long int64_t;
	typedef unsigned long long uint64_t;
	#endif

	// 打开方式.
	#define MODE_READ (1)
	#define MODE_WRITE (2)
	#define MODE_READWRITEFILTER (3)
	#define MODE_EXISTING (4)
	#define MODE_CREATE (8)

	// 读写结构定义.
	typedef struct stream {
	 void* (*open)(struct stream *stream_s, const char* filename, int mode);
	 int (*read)(struct stream *stream_s, void* buf, int size);
	 int (*write)(struct stream *stream_s, void *buf, int size);
	 uint64_t (*seek)(struct stream *stream_s, int64_t offset, int whence);
	 uint64_t (*tell)(struct stream *stream_s);
	 int (*close)(struct stream *stream_s);
	 void* opaque;
	} stream_t;

	// 读写宏定义.
	#define stream_open(s, filename, mode) ((stream_t*)s)->open(((stream_t*)s), filename, mode)
	#define stream_read(s, buf, size) ((stream_t*)s)->read(((stream_t*)s), buf, size)
	#define stream_write(s, buf, size) ((stream_t*)s)->write(((stream_t*)s), buf, size)
	#define stream_seek(s, offset, whence) ((stream_t*)s)->seek(((stream_t*)s), offset, whence)
	#define stream_tell(s) ((stream_t*)s)->tell(((stream_t*)s))
	#define stream_close(s) ((stream_t*)s)->close(((stream_t*)s))

	// 文件读写.
	void* file_open(stream_t *stream_s, const char* filename, int mode);
	int file_read(stream_t *stream_s, void* buf, int size);
	int file_write(stream_t *stream_s, void *buf, int size);
	uint64_t file_seek(stream_t *stream_s, int64_t offset, int whence);
	uint64_t file_tell(stream_t *stream_s);
	int file_close(stream_t *stream_s);

	// 创建文件读写流.
	stream_t* create_file_stream();
	void destory_file_stream(stream_t* stream_s);

	// 一个带读写缓冲的文件stream实现.
	#define READ_BUFFER_SIZE 10485760
	#define WRITE_BUFFER_SIZE 10485760

	typedef struct buf_stream {
	 stream_t s;

	 struct read_buf {
	 void* buf; // 读缓冲.
	 int64_t bufsize; // 缓冲大小.
	 int64_t offset; // 在文件中的offset.
	 } read_buf_s;

	 struct write_buf {
	 void* buf; // 写缓冲.
	 int64_t bufsize; // 缓冲大小.
	 int64_t offset; // 写文件的offset.
	 } write_buf_s;

	 uint64_t offset; // 当前读写指针在文件中的offset.

	} buf_stream_t;

	// 带缓冲的读写实现.
	int buf_file_read(stream_t *stream_s, void* buf, int size);
	int buf_file_write(stream_t *stream_s, void *buf, int size);
	uint64_t buf_file_seek(stream_t *stream_s, int64_t offset, int whence);
	int buf_file_close(stream_t *stream_s);

	// 创建带缓冲的文件读写流.
	stream_t* create_buf_file_stream();
	void destory_buf_file_stream(stream_t* stream_s);

	#endif // __STREAM_H__

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