/* ioapi.c -- IO base function header for compress/uncompress .zip
   files using zlib + zip or unzip API

   Version 1.01e, February 12th, 2005

   Copyright (C) 1998-2005 Gilles Vollant
*/

#include "../zlib.h"
#include "ioapi.h"

voidpf _open_file_func (
   voidpf opaque,
   const char* filename,
   int mode);

uLong _read_file_func (
   voidpf opaque,
   voidpf stream,
   void* buf,
   uLong size);

uLong _write_file_func (
   voidpf opaque,
   voidpf stream,
   const void* buf,
   uLong size);

long ftell_file_func (
   voidpf opaque,
   voidpf stream);

long fseek_file_func (
   voidpf opaque,
   voidpf stream,
   uLong offset,
   int origin);

int _close_file_func (
   voidpf opaque,
   voidpf stream);

int ferror_file_func (
   voidpf opaque,
   voidpf stream);


voidpf _open_file_func (
   voidpf opaque,
   const char* filename,
   int mode)
{
    FILE* file = NULL;
    const char* mode_fopen = NULL;
    if ((mode & ZLIB_FILEFUNC_MODE_READWRITEFILTER)==ZLIB_FILEFUNC_MODE_READ)
        mode_fopen = "rb";
    else
    if (mode & ZLIB_FILEFUNC_MODE_EXISTING)
        mode_fopen = "r+b";
    else
    if (mode & ZLIB_FILEFUNC_MODE_CREATE)
        mode_fopen = "wb";

    if ((filename!=NULL) && (mode_fopen != NULL))
        file = fopen(filename, mode_fopen);
    return file;
}

uLong _read_file_func (
   voidpf opaque,
   voidpf stream,
   void* buf,
   uLong size)
{
	uLong ret;
    ret = (uLong)fread(buf, 1, (size_t)size, (FILE *)stream);
    return ret;
}


uLong _write_file_func (
   voidpf opaque,
   voidpf stream,
   const void* buf,
   uLong size)
{
	uLong ret;
    ret = (uLong)fwrite(buf, 1, (size_t)size, (FILE *)stream);
    return ret;
}


long ftell_file_func (
   voidpf opaque,
   voidpf stream)
{
	long ret;
    ret = ftell((FILE *)stream);
    return ret;
}


long fseek_file_func (
   voidpf opaque,
   voidpf stream,
   uLong offset,
   int origin)
{
	int fseek_origin=0;
    long ret;
    switch (origin)
    {
    case ZLIB_FILEFUNC_SEEK_CUR :
        fseek_origin = SEEK_CUR;
        break;
    case ZLIB_FILEFUNC_SEEK_END :
        fseek_origin = SEEK_END;
        break;
    case ZLIB_FILEFUNC_SEEK_SET :
        fseek_origin = SEEK_SET;
        break;
    default: return -1;
    }
    ret = 0;
    if (fseek((FILE *)stream, offset, fseek_origin) != 0)
        ret = -1;
    return ret;
}


int _close_file_func (
   voidpf opaque,
   voidpf stream)
{
	int ret;
    ret = fclose((FILE *)stream);
    return ret;
}


int ferror_file_func (
   voidpf opaque,
   voidpf stream)
{
	int ret;
    ret = ferror((FILE *)stream);
    return ret;
}

void fill__open_filefunc (
  zlib_filefunc_def* pzlib_filefunc_def)
{
	pzlib_filefunc_def->zopen_file = _open_file_func;
	pzlib_filefunc_def->zread_file = _read_file_func;
	pzlib_filefunc_def->zwrite_file = _write_file_func;
	pzlib_filefunc_def->ztell_file = ftell_file_func;
	pzlib_filefunc_def->zseek_file = fseek_file_func;
	pzlib_filefunc_def->zclose_file = _close_file_func;
	pzlib_filefunc_def->zerror_file = ferror_file_func;
	pzlib_filefunc_def->opaque = NULL;
}