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/*
* alk.c ALK archive manager
*
* Copyright (C) 1997-1998 Masaki Chikama (Wren) <chikama@kasumi.ipl.mech.nagoya-u.ac.jp>
* 1998- <masaki-c@is.aist-nara.ac.jp>
*
* This program 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; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* @version 1.0 01/11/29 initial version
*/
/* $Id: alk.c,v 1.2 2003/01/12 10:48:50 chikama Exp $ */
#include "config.h"
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <glib.h>
#include "portab.h"
#include "system.h"
#include "LittleEndian.h"
#include "alk.h"
alk_t *alk_new(char *path) {
alk_t *alk;
int i, fd;
char *adr;
struct stat sbuf;
if (0 > (fd = open(path, O_RDONLY))) {
WARNING("open: %s\n", strerror(errno));
return NULL;
}
if (0 > fstat(fd, &sbuf)) {
WARNING("fstat: %s\n", strerror(errno));
close(fd);
return NULL;
}
if (MAP_FAILED == (adr = mmap(0, sbuf.st_size, PROT_READ, MAP_SHARED, fd, 0))) {
WARNING("mmap: %s\n", strerror(errno));
close(fd);
return NULL;
}
if (0 != strncmp(adr, "ALK0", 4)) {
WARNING("mmap: %s\n", strerror(errno));
munmap(adr, sbuf.st_size);
close(fd);
return NULL;
}
alk = g_new0(alk_t, 1);
alk->mapadr = adr;
alk->size = sbuf.st_size;
alk->fd = fd;
alk->datanum = LittleEndian_getDW(adr, 4);
alk->offset = g_new(int, alk->datanum);
for (i = 0; i < alk->datanum; i++) {
alk->offset[i] = LittleEndian_getDW(adr, 8 + i * 8);
}
return alk;
}
int alk_free(alk_t *alk) {
if (alk == NULL) return OK;
munmap(alk->mapadr, alk->size);
close(alk->fd);
g_free(alk->offset);
g_free(alk);
return OK;
}
char *alk_get(alk_t *alk, int no) {
if (no >= alk->datanum) return NULL;
return alk->mapadr + alk->offset[no];
}
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