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/*
Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
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.hpp provies File Sources and Sinks
*/
#ifndef TAO_CRYPT_FILE_HPP
#define TAO_CRYPT_FILE_HPP
#include "misc.hpp"
#include "block.hpp"
#include "error.hpp"
#include <stdio.h>
namespace TaoCrypt {
class Source {
ByteBlock buffer_;
word32 current_;
Error error_;
public:
explicit Source(word32 sz = 0) : buffer_(sz), current_(0) {}
Source(const byte* b, word32 sz) : buffer_(b, sz), current_(0) {}
word32 remaining() { if (GetError().What()) return 0;
else return buffer_.size() - current_; }
word32 size() const { return buffer_.size(); }
void grow(word32 sz) { buffer_.CleanGrow(sz); }
bool IsLeft(word32 sz) { if (remaining() >= sz) return true;
else { SetError(CONTENT_E); return false; } }
const byte* get_buffer() const { return buffer_.get_buffer(); }
const byte* get_current() const { return &buffer_[current_]; }
word32 get_index() const { return current_; }
void set_index(word32 i) { if (i < size()) current_ = i; }
byte operator[] (word32 i) { current_ = i; return next(); }
byte next() { if (IsLeft(1)) return buffer_[current_++]; else return 0; }
byte prev() { if (current_) return buffer_[--current_]; else return 0; }
void add(const byte* data, word32 len)
{
if (IsLeft(len)) {
memcpy(buffer_.get_buffer() + current_, data, len);
current_ += len;
}
}
void advance(word32 i) { if (IsLeft(i)) current_ += i; }
void reset(ByteBlock&);
Error GetError() { return error_; }
void SetError(ErrorNumber w) { error_.SetError(w); }
friend class FileSource; // for get()
Source(const Source& that)
: buffer_(that.buffer_), current_(that.current_) {}
Source& operator=(const Source& that)
{
Source tmp(that);
Swap(tmp);
return *this;
}
void Swap(Source& other)
{
buffer_.Swap(other.buffer_);
STL::swap(current_, other.current_);
}
};
// File Source
class FileSource {
FILE* file_;
public:
FileSource(const char* fname, Source& source);
~FileSource();
word32 size(bool use_current = false);
private:
word32 get(Source&);
word32 size_left();
FileSource(const FileSource&); // hide
FileSource& operator=(const FileSource&); // hide
};
// File Sink
class FileSink {
FILE* file_;
public:
FileSink(const char* fname, Source& source);
~FileSink();
word32 size(bool use_current = false);
private:
void put(Source&);
FileSink(const FileSink&); // hide
FileSink& operator=(const FileSink&); // hide
};
} // namespace
#endif // TAO_CRYPT_FILE_HPP
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