/* 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

   Modified by Sergey A. Tachenov to integrate with Qt.

*/

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "zlib.h"

#include "ioapi.h"

#include "quazip_global.h"

#include <QIODevice>

/* I've found an old Unix (a SunOS 4.1.3_U1) without all SEEK_* defined.... */

#ifndef SEEK_CUR

#define SEEK_CUR    1

#endif

#ifndef SEEK_END

#define SEEK_END    2

#endif

#ifndef SEEK_SET

#define SEEK_SET    0

#endif

voidpf ZCALLBACK qiodevice_open_file_func (

   voidpf opaque UNUSED,

   voidpf file,

   int mode)

{

    QIODevice *iodevice = reinterpret_cast<QIODevice*>(file);

    if(iodevice->isSequential())

        return NULL;

    if ((mode & ZLIB_FILEFUNC_MODE_READWRITEFILTER)==ZLIB_FILEFUNC_MODE_READ)

        iodevice->open(QIODevice::ReadOnly);

    else

    if (mode & ZLIB_FILEFUNC_MODE_EXISTING)

        iodevice->open(QIODevice::ReadWrite);

    else

    if (mode & ZLIB_FILEFUNC_MODE_CREATE)

        iodevice->open(QIODevice::WriteOnly);

    if(iodevice->isOpen())

        return iodevice;

    else

        return NULL;

}

uLong ZCALLBACK qiodevice_read_file_func (

   voidpf opaque UNUSED,

   voidpf stream,

   void* buf,

   uLong size)

{

    uLong ret;

    ret = (uLong)((QIODevice*)stream)->read((char*)buf,size);

    return ret;

}

uLong ZCALLBACK qiodevice_write_file_func (

   voidpf opaque UNUSED,

   voidpf stream,

   const void* buf,

   uLong size)

{

    uLong ret;

    ret = (uLong)((QIODevice*)stream)->write((char*)buf,size);

    return ret;

}

uLong ZCALLBACK qiodevice_tell_file_func (

   voidpf opaque UNUSED,

   voidpf stream)

{

    uLong ret;

    ret = ((QIODevice*)stream)->pos();

    return ret;

}

int ZCALLBACK qiodevice_seek_file_func (

   voidpf opaque UNUSED,

   voidpf stream,

   uLong offset,

   int origin)

{

    uLong qiodevice_seek_result=0;

    int ret;

    switch (origin)

    {

    case ZLIB_FILEFUNC_SEEK_CUR :

        qiodevice_seek_result = ((QIODevice*)stream)->pos() + offset;

        break;

    case ZLIB_FILEFUNC_SEEK_END :

        qiodevice_seek_result = ((QIODevice*)stream)->size() - offset;

        break;

    case ZLIB_FILEFUNC_SEEK_SET :

        qiodevice_seek_result = offset;

        break;

    default: return -1;

    }

    ret = !((QIODevice*)stream)->seek(qiodevice_seek_result);

    return ret;

}

int ZCALLBACK qiodevice_close_file_func (

   voidpf opaque UNUSED,

   voidpf stream)

{

    ((QIODevice*)stream)->close();

    return 0;

}

int ZCALLBACK qiodevice_error_file_func (

   voidpf opaque UNUSED,

   voidpf stream)

{

    return !((QIODevice*)stream)->errorString().isEmpty();

}

void fill_qiodevice_filefunc (

  zlib_filefunc_def* pzlib_filefunc_def)

{

    pzlib_filefunc_def->zopen_file = qiodevice_open_file_func;

    pzlib_filefunc_def->zread_file = qiodevice_read_file_func;

    pzlib_filefunc_def->zwrite_file = qiodevice_write_file_func;

    pzlib_filefunc_def->ztell_file = qiodevice_tell_file_func;

    pzlib_filefunc_def->zseek_file = qiodevice_seek_file_func;

    pzlib_filefunc_def->zclose_file = qiodevice_close_file_func;

    pzlib_filefunc_def->zerror_file = qiodevice_error_file_func;

    pzlib_filefunc_def->opaque = NULL;

}