Subversion Repositories freemyipod

/*

 * 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