137 lines
3.2 KiB
C
137 lines
3.2 KiB
C
/* Copyright 1996,1997,1999,2001,2002,2008,2009 Alain Knaff.
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* This file is part of mtools.
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*
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* Mtools is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Mtools is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Mtools. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "sysincludes.h"
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#include "msdos.h"
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#include "stream.h"
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int batchmode = 0;
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void limitSizeToOffT(size_t *len, mt_off_t maxLen)
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{
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#if SIZEOF_SIZE_T >= SIZEOF_MT_OFF_T
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if(*len > (size_t) maxLen)
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#else
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if(*len > maxLen)
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#endif
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*len = (size_t) maxLen;
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}
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void init_head(Stream_t *Stream, struct Class_t *Class, Stream_t *Next)
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{
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Stream->Class = Class;
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Stream->refs = 1;
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Stream->Next = Next;
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}
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int flush_stream(Stream_t *Stream)
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{
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int ret=0;
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if(!batchmode) {
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if(Stream->Class->flush)
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ret |= Stream->Class->flush(Stream);
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if(Stream->Next)
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ret |= flush_stream(Stream->Next);
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}
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return ret;
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}
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Stream_t *copy_stream(Stream_t *Stream)
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{
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if(Stream)
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Stream->refs++;
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return Stream;
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}
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int free_stream(Stream_t **Stream)
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{
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int ret=0;
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if(!*Stream)
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return -1;
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if(! --(*Stream)->refs){
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if((*Stream)->Class->flush)
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ret |= (*Stream)->Class->flush(*Stream);
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if((*Stream)->Class->freeFunc)
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ret |= (*Stream)->Class->freeFunc(*Stream);
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if((*Stream)->Next)
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ret |= free_stream(&(*Stream)->Next);
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Free(*Stream);
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}
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*Stream = NULL;
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return ret;
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}
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#define GET_DATA(stream, date, size, type, address) \
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(stream)->Class->get_data( (stream), (date), (size), (type), (address) )
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int set_geom_pass_through(Stream_t *Stream, device_t *dev, device_t *orig_dev)
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{
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return SET_GEOM(Stream->Next, dev, orig_dev);
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}
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int set_geom_noop(Stream_t *Stream UNUSEDP,
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device_t *dev UNUSEDP,
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device_t *orig_dev UNUSEDP)
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{
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return 0;
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}
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int get_data_pass_through(Stream_t *Stream, time_t *date, mt_off_t *size,
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int *type, uint32_t *address)
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{
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return GET_DATA(Stream->Next, date, size, type, address);
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}
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ssize_t pread_pass_through(Stream_t *Stream, char *buf,
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mt_off_t start, size_t len)
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{
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return PREADS(Stream->Next, buf, start, len);
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}
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ssize_t pwrite_pass_through(Stream_t *Stream, char *buf,
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mt_off_t start, size_t len)
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{
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return PWRITES(Stream->Next, buf, start, len);
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}
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doscp_t *get_dosConvert_pass_through(Stream_t *Stream)
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{
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return GET_DOSCONVERT(Stream->Next);
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}
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/*
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* Adjust number of total sectors by given offset in bytes
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*/
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int adjust_tot_sectors(struct device *dev, mt_off_t offset, char *errmsg)
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{
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if(!dev->tot_sectors)
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/* tot_sectors not set, do nothing */
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return 0;
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mt_off_t offs_sectors = offset /
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(dev->sector_size ? dev->sector_size : 512);
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if(offs_sectors > 0 && dev->tot_sectors < (smt_off_t) offs_sectors) {
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if(errmsg)
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sprintf(errmsg,"init: Offset bigger than base image");
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return -1;
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}
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dev->tot_sectors -= (uint32_t) offs_sectors;
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return 0;
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}
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