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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
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