toolchain/elf2flt/elf2flt/compress.h

   1 /*
   2  * Helper functions to handle compression via zlib
   3  *
   4  * Copyright (C) 2007-2008 Julian Brown
   5  * Copyright (C) 2008 Mike Frysinger
   6  *
   7  * Licensed under the GPL-2 or later.
   8  */
   9
  10 #ifndef __ELF2FLT_COMPRESS_H__
  11 #define __ELF2FLT_COMPRESS_H__
  12
  13 #include <zlib.h>
  14
  15 typedef enum
  16 {
  17   INVALID,
  18   UNCOMPRESSED,
  19   COMPRESSED
  20 } stream_type;
  21
  22 /* Tagged union holding either a regular FILE* handle or a zlib gzFile
  23    handle.  */
  24 typedef struct
  25 {
  26   stream_type type;
  27   const char *mode;
  28   union
  29     {
  30       FILE *filep;
  31       gzFile gzfilep;
  32     } u;
  33 } stream;
  34
  35 int fopen_stream_u(stream *fp, const char *path, const char *mode);
  36 size_t fread_stream(void *ptr, size_t size, size_t nmemb, stream *str);
  37 size_t fwrite_stream(const void *ptr, size_t size, size_t nmemb, stream *str);
  38 int fclose_stream(stream *str);
  39 int ferror_stream(stream *str);
  40 void reopen_stream_compressed(stream *str);
  41 void transfer(stream *ifp, stream *ofp, int count);
  42
  43 #endif