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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;
- }
-
- int FileInStream::pos()
- {
- if (!file)
- throw Exception("File is not open");
-
- return ftell(file) + ptr - b;
- }
-
- int FileInStream::overrun(int itemSize, int nItems, bool wait)
- {
- if (itemSize > (int)sizeof(b))
- throw Exception("FileInStream overrun: max itemSize exceeded");
-
- if (end - ptr != 0)
- memmove(b, ptr, end - ptr);
-
- end -= ptr - b;
- ptr = b;
-
-
- while (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;
- }
-
- if (itemSize * nItems > end - ptr)
- nItems = (end - ptr) / itemSize;
-
- return nItems;
- }
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