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/*
Copyright (C) 2000-2007 MySQL AB
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; version 2 of the License.
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; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
MA 02110-1301 USA.
*/
/* file.cpp implements File Sources and Sinks
*/
#include "runtime.hpp"
#include "file.hpp"
namespace TaoCrypt {
FileSource::FileSource(const char* fname, Source& source)
{
file_ = fopen(fname, "rb");
if (file_) get(source);
}
FileSource::~FileSource()
{
if (file_)
fclose(file_);
}
// return size of source from beginning or current position
word32 FileSource::size(bool use_current)
{
long current = ftell(file_);
long begin = current;
if (!use_current) {
fseek(file_, 0, SEEK_SET);
begin = ftell(file_);
}
fseek(file_, 0, SEEK_END);
long end = ftell(file_);
fseek(file_, current, SEEK_SET);
return end - begin;
}
word32 FileSource::size_left()
{
return size(true);
}
// fill file source from source
word32 FileSource::get(Source& source)
{
word32 sz(size());
if (source.size() < sz)
source.grow(sz);
size_t bytes = fread(source.buffer_.get_buffer(), 1, sz, file_);
if (bytes == 1)
return sz;
else
return 0;
}
FileSink::FileSink(const char* fname, Source& source)
{
file_ = fopen(fname, "wb");
if (file_) put(source);
}
FileSink::~FileSink()
{
if (file_)
fclose(file_);
}
// fill source from file sink
void FileSink::put(Source& source)
{
fwrite(source.get_buffer(), 1, source.size(), file_);
}
// swap with other and reset to beginning
void Source::reset(ByteBlock& otherBlock)
{
buffer_.Swap(otherBlock);
current_ = 0;
}
} // namespace
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