ciderpress/diskimg/libhfs/os.c

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2007-03-27 17:47:10 +00:00
/*
* libhfs - library for reading and writing Macintosh HFS volumes
* Copyright (C) 1996-1998 Robert Leslie
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id$
*/
# ifdef HAVE_CONFIG_H
# include "config.h"
# endif
# ifdef HAVE_FCNTL_H
# include <fcntl.h>
# else
int open(const char *, int, ...);
int fcntl(int, int, ...);
# endif
# ifdef HAVE_UNISTD_H
# include <unistd.h>
# else
#ifndef _WIN32
int close(int);
off_t lseek(int, off_t, int);
ssize_t read(int, void *, size_t);
ssize_t write(int, const char *, size_t);
int stat(const char *, struct stat *);
int fstat(int, struct stat *);
#endif
# endif
# include <errno.h>
# include <sys/stat.h>
# include <stdlib.h>
# include <stdio.h> /* debug */
# include "libhfs.h"
# include "os.h"
typedef struct cp_private {
oscallback func; /* function to call */
void* cookie; /* magic cookie to pass in */
long cur_block; /* current seek offset */
} cp_private;
/*
* NAME: os->callback_open()
* DESCRIPTION: open and lock a new descriptor from the given path and mode
*/
int os_callback_open(void **priv, oscallback func, void* cookie)
{
cp_private* mypriv;
mypriv = malloc(sizeof(*mypriv));
mypriv->func = func;
mypriv->cookie = cookie;
mypriv->cur_block = 0;
*priv = mypriv;
//fprintf(stderr, "ALLOC %p->%p\n", priv, *priv);
return 0;
}
/*
* NAME: os->close()
* DESCRIPTION: close an open descriptor
*/
int os_close(void **priv)
{
//fprintf(stderr, "FREEING %p->%p\n", priv, *priv);
free(*priv);
*priv = 0;
return 0;
}
#ifdef CP_NOT_USED
/*
* NAME: os->same()
* DESCRIPTION: return 1 iff path is same as the open descriptor
*/
int os_same(void **priv, const char *path)
{
return 0;
int fd = (int) *priv;
struct stat fdev, dev;
if (fstat(fd, &fdev) == -1 ||
stat(path, &dev) == -1)
ERROR(errno, "can't get path information");
return fdev.st_dev == dev.st_dev &&
fdev.st_ino == dev.st_ino;
fail:
return -1;
}
#endif
/*
* NAME: os->seek()
* DESCRIPTION: set a descriptor's seek pointer (offset in blocks)
*/
unsigned long os_seek(void **priv, unsigned long offset)
{
cp_private* mypriv = (cp_private*) *priv;
unsigned long result;
if (offset == (unsigned long) -1) {
result = (*mypriv->func)(mypriv->cookie, HFS_CB_VOLSIZE, 0, 0);
} else {
result = (*mypriv->func)(mypriv->cookie, HFS_CB_SEEK, offset, 0);
if (result != -1)
mypriv->cur_block = offset;
}
return result;
}
/*
* NAME: os->read()
* DESCRIPTION: read blocks from an open descriptor
*/
unsigned long os_read(void **priv, void *buf, unsigned long len)
{
cp_private* mypriv = (cp_private*) *priv;
unsigned long result;
unsigned long success = 0;
while (len--) {
result = (*mypriv->func)(mypriv->cookie, HFS_CB_READ,
mypriv->cur_block, buf);
if (result == -1)
break;
mypriv->cur_block++;
buf = ((unsigned char*) buf) + HFS_BLOCKSZ;
success++;
}
return success;
}
/*
* NAME: os->write()
* DESCRIPTION: write blocks to an open descriptor
*/
unsigned long os_write(void **priv, const void *buf, unsigned long len)
{
cp_private* mypriv = (cp_private*) *priv;
unsigned long result;
unsigned long success = 0;
while (len--) {
result = (*mypriv->func)(mypriv->cookie, HFS_CB_WRITE,
mypriv->cur_block, (void*)buf);
if (result == -1)
break;
mypriv->cur_block++;
buf = ((unsigned char*) buf) + HFS_BLOCKSZ;
success++;
}
return success;
}