1 files changed, 72 insertions, 0 deletions
diff --git a/reader/src/formats/util/MergedStream.cpp b/reader/src/formats/util/MergedStream.cpp
new file mode 100644
index 0000000..1a26a33
--- /dev/null
+++ b/reader/src/formats/util/MergedStream.cpp
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2008-2012 Geometer Plus <contact@geometerplus.com>
+ *
+ * This program 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 program 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 program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#include "MergedStream.h"
+
+bool MergedStream::open() {
+	close();
+	resetToStart();
+	myOffset = 0;
+	myCurrentStream = nextStream();
+	return !myCurrentStream.isNull() && myCurrentStream->open();
+}
+
+std::size_t MergedStream::read(char *buffer, std::size_t maxSize) {
+	std::size_t bytesToRead = maxSize;
+	while ((bytesToRead > 0) && !myCurrentStream.isNull()) {
+		std::size_t len = myCurrentStream->read(buffer, bytesToRead);
+		bytesToRead -= len;
+		if (buffer != 0) {
+			buffer += len;
+		}
+		if (bytesToRead != 0) {
+			if (buffer != 0) {
+				*buffer++ = '\n';
+			}
+			bytesToRead--;
+			myCurrentStream = nextStream();
+			if (myCurrentStream.isNull() || !myCurrentStream->open()) {
+				break;
+			}
+		}
+	}
+	myOffset += maxSize - bytesToRead;
+	return maxSize - bytesToRead;
+}
+
+void MergedStream::close() {
+	myCurrentStream.reset();
+}
+
+void MergedStream::seek(int offset, bool absoluteOffset) {
+	// works for nonnegative offsets only
+	if (absoluteOffset) {
+		offset -= myOffset;
+	}
+	read(0, offset);
+}
+
+std::size_t MergedStream::offset() const {
+	return myOffset;
+}
+
+std::size_t MergedStream::sizeOfOpened() {
+	// coudn't be implemented
+	return 0;
+}