cpl_minizip_ioapi.cpp

/* Modified version by Even Rouault. :
      - change fill_fopen_filefunc to cpl_fill_fopen_filefunc
      - port to VSIL*L API
      - Remove old C style function prototypes
      - Add support for ZIP64

 * Copyright (c) 2008-2010, Even Rouault <even dot rouault at spatialys.com>

   Original licence available in port/LICENCE_minizip
*/

/* 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 "cpl_port.h"
#include "cpl_minizip_ioapi.h"

#include <cstddef>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif

#include "cpl_minizip_ioapi.h"
#include "cpl_vsi.h"
#include "zconf.h"
#include "zlib.h"

static voidpf ZCALLBACK fopen_file_func(voidpf /* opaque */,
                                        const char *filename, int mode)
{
    VSILFILE *file = nullptr;
    const char *mode_fopen = nullptr;
    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 != nullptr)
            return VSIFOpenExL(filename, mode_fopen, true);
    }

    if ((filename != nullptr) && (mode_fopen != nullptr))
        file = VSIFOpenL(filename, mode_fopen);
    return file;
}

static uLong ZCALLBACK fread_file_func(voidpf /* opaque */, voidpf stream,
                                       void *buf, uLong size)
{
    uLong ret = static_cast<uLong>(VSIFReadL(buf, 1, static_cast<size_t>(size),
                                             static_cast<VSILFILE *>(stream)));
    return ret;
}

static uLong ZCALLBACK fwrite_file_func(voidpf /* opaque */, voidpf stream,
                                        const void *buf, uLong size)
{
    uLong ret = static_cast<uLong>(VSIFWriteL(buf, 1, static_cast<size_t>(size),
                                              static_cast<VSILFILE *>(stream)));
    return ret;
}

static uLong64 ZCALLBACK ftell_file_func(voidpf /* opaque */, voidpf stream)
{
    uLong64 ret;
    ret = VSIFTellL(reinterpret_cast<VSILFILE *>(stream));
    return ret;
}

static long ZCALLBACK fseek_file_func(voidpf /* opaque */, voidpf stream,
                                      uLong64 offset, int origin)
{
    int fseek_origin = 0;
    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;
    }
    return VSIFSeekL(reinterpret_cast<VSILFILE *>(stream), offset,
                     fseek_origin);
}

static int ZCALLBACK fclose_file_func(voidpf /* opaque */, voidpf stream)
{
    return VSIFCloseL(reinterpret_cast<VSILFILE *>(stream));
}

static int ZCALLBACK ferror_file_func(voidpf /* opaque */, voidpf /* stream */)
{
    // ret = ferror((FILE *)stream);
    return 0;
}

void cpl_fill_fopen_filefunc(zlib_filefunc_def *pzlib_filefunc_def)
{
    pzlib_filefunc_def->zopen_file = fopen_file_func;
    pzlib_filefunc_def->zread_file = fread_file_func;
    pzlib_filefunc_def->zwrite_file = fwrite_file_func;
    pzlib_filefunc_def->ztell_file = ftell_file_func;
    pzlib_filefunc_def->zseek_file = fseek_file_func;
    pzlib_filefunc_def->zclose_file = fclose_file_func;
    pzlib_filefunc_def->zerror_file = ferror_file_func;
    pzlib_filefunc_def->opaque = nullptr;
}