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/* Copyright 1996,1997,1999,2001,2002,2008,2009 Alain Knaff.
* This file is part of mtools.
*
* Mtools 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 3 of the License, or
* (at your option) any later version.
*
* Mtools 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 Mtools. If not, see <http://www.gnu.org/licenses/>.
*/
#include "sysincludes.h"
#include "msdos.h"
#include "stream.h"
int batchmode = 0;
void limitSizeToOffT(size_t *len, mt_off_t maxLen)
{
#if SIZEOF_SIZE_T >= SIZEOF_MT_OFF_T
if(*len > (size_t) maxLen)
#else
if(*len > maxLen)
#endif
*len = (size_t) maxLen;
}
void init_head(Stream_t *Stream, struct Class_t *Class, Stream_t *Next)
{
Stream->Class = Class;
Stream->refs = 1;
Stream->Next = Next;
}
int flush_stream(Stream_t *Stream)
{
int ret=0;
if(!batchmode) {
if(Stream->Class->flush)
ret |= Stream->Class->flush(Stream);
if(Stream->Next)
ret |= flush_stream(Stream->Next);
}
return ret;
}
Stream_t *copy_stream(Stream_t *Stream)
{
if(Stream)
Stream->refs++;
return Stream;
}
int free_stream(Stream_t **Stream)
{
int ret=0;
if(!*Stream)
return -1;
if(! --(*Stream)->refs){
if((*Stream)->Class->flush)
ret |= (*Stream)->Class->flush(*Stream);
if((*Stream)->Class->freeFunc)
ret |= (*Stream)->Class->freeFunc(*Stream);
if((*Stream)->Next)
ret |= free_stream(&(*Stream)->Next);
Free(*Stream);
}
*Stream = NULL;
return ret;
}
#define GET_DATA(stream, date, size, type, address) \
(stream)->Class->get_data( (stream), (date), (size), (type), (address) )
int set_geom_pass_through(Stream_t *Stream, device_t *dev, device_t *orig_dev)
{
return SET_GEOM(Stream->Next, dev, orig_dev);
}
int set_geom_noop(Stream_t *Stream UNUSEDP,
device_t *dev UNUSEDP,
device_t *orig_dev UNUSEDP)
{
return 0;
}
int get_data_pass_through(Stream_t *Stream, time_t *date, mt_off_t *size,
int *type, uint32_t *address)
{
return GET_DATA(Stream->Next, date, size, type, address);
}
ssize_t pread_pass_through(Stream_t *Stream, char *buf,
mt_off_t start, size_t len)
{
return PREADS(Stream->Next, buf, start, len);
}
ssize_t pwrite_pass_through(Stream_t *Stream, char *buf,
mt_off_t start, size_t len)
{
return PWRITES(Stream->Next, buf, start, len);
}
doscp_t *get_dosConvert_pass_through(Stream_t *Stream)
{
return GET_DOSCONVERT(Stream->Next);
}
/*
* Adjust number of total sectors by given offset in bytes
*/
int adjust_tot_sectors(struct device *dev, mt_off_t offset, char *errmsg)
{
if(!dev->tot_sectors)
/* tot_sectors not set, do nothing */
return 0;
mt_off_t offs_sectors = offset /
(dev->sector_size ? dev->sector_size : 512);
if(offs_sectors > 0 && dev->tot_sectors < (smt_off_t) offs_sectors) {
if(errmsg)
sprintf(errmsg,"init: Offset bigger than base image");
return -1;
}
dev->tot_sectors -= (uint32_t) offs_sectors;
return 0;
}
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