Initial commit

common/rdr/FileInStream.cxx

@@ -0,0 +1,87 @@
+/* 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;
+}