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backends/fs/posix/posix-iostream.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#define FORBIDDEN_SYMBOL_ALLOW_ALL
+
+#include "backends/fs/posix/posix-iostream.h"
+
+#include <sys/stat.h>
+
+PosixIoStream::PosixIoStream(void *handle) :
+		StdioStream(handle) {
+}
+
+int64 PosixIoStream::size() const {
+	int fd = fileno((FILE *)_handle);
+	if (fd == -1) {
+		return StdioStream::size();
+	}
+
+	// Using fstat to obtain the file size is generally faster than fseek / ftell
+	// because it does not affect the IO buffer.
+	struct stat st;
+	if (fstat(fd, &st) == -1) {
+		return StdioStream::size();
+	}
+
+	return st.st_size;
+}