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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
* Copyright (C) 2013 D. R. Commander. All Rights Reserved.
* Copyright 2015 Pierre Ossman for Cendio AB
*
* This 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 software 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 software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#include <errno.h>
#include <rdr/Exception.h>
#include <rdr/FileInStream.h>
using namespace rdr;
FileInStream::FileInStream(const char *fileName)
{
file = fopen(fileName, "rb");
if (!file)
throw SystemException("fopen", errno);
ptr = end = b;
}
FileInStream::~FileInStream(void) {
if (file) {
fclose(file);
file = NULL;
}
}
void FileInStream::reset(void) {
if (!file)
throw Exception("File is not open");
if (fseek(file, 0, SEEK_SET) != 0)
throw SystemException("fseek", errno);
ptr = end = b;
}
size_t FileInStream::pos()
{
if (!file)
throw Exception("File is not open");
return ftell(file) + ptr - b;
}
size_t FileInStream::overrun(size_t itemSize, size_t nItems, bool wait)
{
if (itemSize > sizeof(b))
throw Exception("FileInStream overrun: max itemSize exceeded");
if (end - ptr != 0)
memmove(b, ptr, end - ptr);
end -= ptr - b;
ptr = b;
while ((size_t)(end - b) < itemSize) {
size_t n = fread((U8 *)end, b + sizeof(b) - end, 1, file);
if (n == 0) {
if (ferror(file))
throw SystemException("fread", errno);
if (feof(file))
throw EndOfStream();
return 0;
}
end += b + sizeof(b) - end;
}
size_t nAvail;
nAvail = (end - ptr) / itemSize;
if (nAvail < nItems)
return nAvail;
return nItems;
}
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