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/* core_fileio.c - file I/O functions
* Copyright (C) 2000-2009 Jason Jordan <shnutils@freeshell.org>
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <string.h>
#include "shntool.h"
CVSID("$Id: core_fileio.c,v 1.44 2009/03/11 17:18:01 jason Exp $")
int read_n_bytes(FILE *in,unsigned char *buf,int num,progress_info *proginfo)
/* reads the specified number of bytes from the file descriptor 'in' into buf */
{
int read;
if ((read = fread(buf,1,num,in)) != num) {
st_debug1("tried to read %d bytes, but only read %d -- possible truncated/corrupt file",num,read);
}
if (proginfo) {
proginfo->bytes_written += read;
prog_update(proginfo);
}
return read;
}
int write_n_bytes(FILE *out,unsigned char *buf,int num,progress_info *proginfo)
/* writes the specified number of bytes from buf into the file descriptor 'out' */
{
int wrote;
if ((wrote = fwrite(buf,1,num,out)) != num) {
st_debug1("tried to write %d bytes, but only wrote %d -- make sure that:\n"
"+ there is enough disk space\n"
"+ the specified output directory exists\n"
"+ you have permission to create files in the output directory\n"
"+ the output format's encoder is installed and in your PATH",num,wrote);
}
if (proginfo) {
proginfo->bytes_written += wrote;
prog_update(proginfo);
}
return wrote;
}
unsigned long transfer_n_bytes_internal(FILE *in,FILE *out1,FILE *out2,unsigned long bytes,progress_info *proginfo)
/* transfers 'bytes' bytes from file descriptor 'in' to file descriptor 'out' */
{
unsigned char buf[XFER_SIZE];
int bytes_to_xfer,
actual_bytes_read,
actual_bytes_written1,
actual_bytes_written2;
unsigned long total_bytes_to_xfer = bytes,
total_bytes_xfered = 0;
while (total_bytes_to_xfer > 0) {
bytes_to_xfer = min(total_bytes_to_xfer,XFER_SIZE);
actual_bytes_read = read_n_bytes(in,buf,bytes_to_xfer,NULL);
actual_bytes_written1 = write_n_bytes(out1,buf,actual_bytes_read,proginfo);
actual_bytes_written2 = (out2) ? write_n_bytes(out2,buf,actual_bytes_read,NULL) : 0;
total_bytes_xfered += (unsigned long)actual_bytes_written1;
if (actual_bytes_read != bytes_to_xfer || actual_bytes_written1 != bytes_to_xfer || (out2 && actual_bytes_written2 != bytes_to_xfer))
break;
total_bytes_to_xfer -= bytes_to_xfer;
}
return total_bytes_xfered;
}
int write_padding(FILE *out,int bytes,progress_info *proginfo)
/* writes the specified number of zero bytes to the file descriptor given */
{
unsigned char silence[CD_BLOCK_SIZE];
if (bytes >= CD_BLOCK_SIZE) {
/* padding should always be less than the size of the block being padded */
return 0;
}
memset((void *)silence,0,CD_BLOCK_SIZE);
return write_n_bytes(out,silence,bytes,proginfo);
}
bool read_value_long(FILE *file,unsigned long *be_val,unsigned long *le_val,unsigned char *tag_val)
/* reads an unsigned long in big- and/or little-endian format from a file descriptor */
{
unsigned char buf[5];
if (fread(buf, 1, 4, file) != 4)
return FALSE;
buf[4] = 0;
if (be_val)
*be_val = (((unsigned long)buf[0]) << 24)
| (((unsigned long)buf[1]) << 16)
| (((unsigned long)buf[2]) << 8)
| ((unsigned long)buf[3]);
if (le_val)
*le_val = (((unsigned long)buf[3]) << 24)
| (((unsigned long)buf[2]) << 16)
| (((unsigned long)buf[1]) << 8)
| ((unsigned long)buf[0]);
if (tag_val)
tagcpy(tag_val,buf);
return TRUE;
}
bool read_value_short(FILE *file,unsigned short *be_val,unsigned short *le_val)
/* reads an unsigned short in big- and/or little-endian format from a file descriptor */
{
unsigned char buf[2];
if (fread(buf, 1, 2, file) != 2)
return FALSE;
if (be_val)
*be_val = (buf[0] << 8) | buf[1];
if (le_val)
*le_val = (buf[1] << 8) | buf[0];
return TRUE;
}
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