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/**************************************************************************
*
* Copyright 2011 Jose Fonseca
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
**************************************************************************/
#include <fstream>
#include "os.hpp"
#include "trace_file.hpp"
using namespace trace;
File *
File::createForRead(const char *filename)
{
std::ifstream stream(filename, std::ifstream::binary | std::ifstream::in);
if (!stream.is_open()) {
os::log("error: failed to open %s\n", filename);
return NULL;
}
unsigned char byte1, byte2;
stream >> byte1;
stream >> byte2;
stream.close();
File *file;
if (byte1 == SNAPPY_BYTE1 && byte2 == SNAPPY_BYTE2) {
file = File::createSnappy();
} else if (byte1 == 0x1f && byte2 == 0x8b) {
file = File::createZLib();
} else {
os::log("error: %s: unkwnown compression\n", filename);
return NULL;
}
if (!file) {
return NULL;
}
if (!file->open(filename, File::Read)) {
os::log("error: could not open %s for reading\n", filename);
delete file;
return NULL;
}
return file;
}
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