Retro68/elf2flt/compress.h

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2012-03-27 21:31:44 +00:00
/*
* Helper functions to handle compression via zlib
*
* Copyright (C) 2007-2008 Julian Brown
* Copyright (C) 2008 Mike Frysinger
*
* Licensed under the GPL-2 or later.
*/
#ifndef __ELF2FLT_COMPRESS_H__
#define __ELF2FLT_COMPRESS_H__
#include <zlib.h>
typedef enum
{
INVALID,
UNCOMPRESSED,
COMPRESSED
} stream_type;
/* Tagged union holding either a regular FILE* handle or a zlib gzFile
handle. */
typedef struct
{
stream_type type;
const char *mode;
union
{
FILE *filep;
gzFile gzfilep;
} u;
} stream;
int fopen_stream_u(stream *fp, const char *path, const char *mode);
size_t fread_stream(void *ptr, size_t size, size_t nmemb, stream *str);
size_t fwrite_stream(const void *ptr, size_t size, size_t nmemb, stream *str);
int fclose_stream(stream *str);
int ferror_stream(stream *str);
int fseek_stream(stream *str, long offset, int whence);
void reopen_stream_compressed(stream *str);
void transfer(stream *ifp, stream *ofp, int count);
#endif