gunzip.cc

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/*
 * This file is part of openSDK.
 *
 * Copyright (C) 2006-2007 openSDK team
 *
 * openSDK is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2.
 *
 * openSDK is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with openSDK; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *     $Id: gunzip.cc,v 1.3 2007/03/17 11:50:22 nuno-lopes Exp $
 */

#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include "gunzip.h"

int gunzip_module(const char *name, const char *tmp)
{
        gzFile file = gzopen(name, "rb");
        if (!file) {
                if (errno == 0) {
                        return Z_MEM_ERROR;
                }
                return Z_ERRNO;
        }

        int dest = open(tmp, O_WRONLY | O_CREAT, 0666);
        if (dest == -1) {
                gzclose(file);
                return Z_ERRNO;
        }

        // files opened. now uncompress the data and store it
        // TODO: use mmap() where possible
        do {
                char buf[8192];
                int read = gzread(file, buf, sizeof(buf));

                if (read == 0) { //EOF
                        gzclose(file);
                        close(dest);
                        return Z_OK;

                } else if (read == -1) {
                        int err;
                        gzerror(file, &err);
                        return err;

                } else { //OK, write the buffer to the file
                        write(dest, buf, read);
                }

        } while (1);
}

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