Initial commit

engines/glk/comprehend/file_buf.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/>.
+ *
+ */
+
+#include "glk/comprehend/file_buf.h"
+#include "common/algorithm.h"
+#include "common/file.h"
+
+namespace Glk {
+namespace Comprehend {
+
+FileBuffer::FileBuffer(const Common::String &filename) : _pos(0) {
+	// Open the file
+	Common::File f;
+	if (!f.open(Common::Path(filename)))
+		error("Could not open - %s", filename.c_str());
+
+	_data.resize(f.size());
+	_readBytes.resize(f.size());
+	f.read(&_data[0], f.size());
+}
+
+FileBuffer::FileBuffer(Common::ReadStream *stream, size_t size) : _pos(0) {
+	_data.resize(size);
+	_readBytes.resize(size);
+	stream->read(&_data[0], size);
+}
+
+
+bool FileBuffer::exists(const Common::String &filename) {
+	return Common::File::exists(Common::Path(filename));
+}
+
+void FileBuffer::close() {
+	_data.clear();
+	_readBytes.clear();
+	_pos = 0;
+}
+
+bool FileBuffer::seek(int64 offset, int whence) {
+	switch (whence) {
+	case SEEK_SET:
+		_pos = offset;
+		break;
+	case SEEK_CUR:
+		_pos += offset;
+		break;
+	case SEEK_END:
+		_pos = (int)_data.size() + offset;
+		break;
+	default:
+		break;
+	}
+
+	return true;
+}
+
+uint32 FileBuffer::read(void *dataPtr, uint32 dataSize) {
+	int32 bytesRead = CLIP((int32)dataSize, (int32)0, (int32)_data.size() - _pos);
+	if (bytesRead) {
+		Common::fill(&_readBytes[_pos], &_readBytes[_pos] + bytesRead, true);
+		Common::copy(&_data[_pos], &_data[_pos] + bytesRead, (byte *)dataPtr);
+		_pos += bytesRead;
+	}
+
+	return bytesRead;
+}
+
+size_t FileBuffer::strlen(bool *eof) {
+	uint8 *end;
+
+	if (eof)
+		*eof = false;
+
+	end = (uint8 *)memchr(&_data[_pos], '\0', size() - _pos);
+	if (!end) {
+		// No null terminator - string is remaining length
+		if (eof)
+			*eof = true;
+		return size() - _pos;
+	}
+
+	return end - &_data[_pos];
+}
+
+void FileBuffer::showUnmarked() {
+	int i, start = -1;
+
+	for (i = 0; i < (int)_data.size(); i++) {
+		if (!_readBytes[i] && start == -1)
+			start = i;
+
+		if ((_readBytes[i] || i == (int)_data.size() - 1) && start != -1) {
+			warning("%.4x - %.4x unmarked (%d bytes)\n",
+			        start, i - 1, i - start);
+			start = -1;
+		}
+	}
+}
+
+} // namespace Comprehend
+} // namespace Glk