zip_io.h

/*************************************************************************/
/*  zip_io.h                                                             */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/
#ifndef ZIP_IO_H
#define ZIP_IO_H

#include "io/zip.h"
#include "io/unzip.h"
#include "os/file_access.h"
#include "os/copymem.h"


static void* zipio_open(void* data, const char* p_fname, int mode) {

    FileAccess *&f = *(FileAccess**)data;

    String fname;
    fname.parse_utf8(p_fname);

    if (mode & ZLIB_FILEFUNC_MODE_WRITE) {
        f = FileAccess::open(fname,FileAccess::WRITE);
    } else {

        f = FileAccess::open(fname,FileAccess::READ);
    }

    if (!f)
        return NULL;

    return data;

};

static uLong zipio_read(void* data, void* fdata, void* buf, uLong size) {

    FileAccess* f = *(FileAccess**)data;
    return f->get_buffer((uint8_t*)buf, size);

};

static uLong zipio_write(voidpf opaque, voidpf stream, const void* buf, uLong size) {

    FileAccess* f = *(FileAccess**)opaque;
    f->store_buffer((uint8_t*)buf, size);
    return size;
};


static long zipio_tell (voidpf opaque, voidpf stream) {

    FileAccess* f = *(FileAccess**)opaque;
    return f->get_pos();
};

static long zipio_seek(voidpf opaque, voidpf stream, uLong offset, int origin) {

    FileAccess* f = *(FileAccess**)opaque;

    int pos = offset;
    switch (origin) {

    case ZLIB_FILEFUNC_SEEK_CUR:
        pos = f->get_pos() + offset;
        break;
    case ZLIB_FILEFUNC_SEEK_END:
        pos = f->get_len() + offset;
        break;
    default:
        break;
    };

    f->seek(pos);
    return 0;
};

static int zipio_close(voidpf opaque, voidpf stream) {

    FileAccess*& f = *(FileAccess**)opaque;
    if (f) {
        f->close();
        f=NULL;
    }
    return 0;
};

static int zipio_testerror(voidpf opaque, voidpf stream) {

    FileAccess* f = *(FileAccess**)opaque;
    return (f && f->get_error()!=OK)?1:0;
};



static voidpf zipio_alloc(voidpf opaque, uInt items, uInt size) {

    voidpf ptr =memalloc(items*size);
    zeromem(ptr,items*size);
    return ptr;
}


static void zipio_free(voidpf opaque, voidpf address) {

    memfree(address);
}


static zlib_filefunc_def zipio_create_io_from_file(FileAccess **p_file) {

    zlib_filefunc_def io;
    io.opaque = p_file;
    io.zopen_file = zipio_open;
    io.zread_file = zipio_read;
    io.zwrite_file = zipio_write;
    io.ztell_file = zipio_tell;
    io.zseek_file = zipio_seek;
    io.zclose_file = zipio_close;
    io.zerror_file = zipio_testerror;
    io.alloc_mem=zipio_alloc;
    io.free_mem=zipio_free;
    return io;
}



#endif // ZIP_IO_H