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130 lines
3.5 KiB
C++
130 lines
3.5 KiB
C++
/*
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Copyright (C) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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MA 02110-1301 USA.
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*/
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/* file.hpp provies File Sources and Sinks
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*/
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#ifndef TAO_CRYPT_FILE_HPP
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#define TAO_CRYPT_FILE_HPP
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#include "misc.hpp"
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#include "block.hpp"
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#include "error.hpp"
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#include <stdio.h>
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namespace TaoCrypt {
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class Source {
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ByteBlock buffer_;
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word32 current_;
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Error error_;
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public:
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explicit Source(word32 sz = 0) : buffer_(sz), current_(0) {}
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Source(const byte* b, word32 sz) : buffer_(b, sz), current_(0) {}
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word32 remaining() { if (GetError().What()) return 0;
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else return buffer_.size() - current_; }
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word32 size() const { return buffer_.size(); }
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void grow(word32 sz) { buffer_.CleanGrow(sz); }
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bool IsLeft(word32 sz) { if (remaining() >= sz) return true;
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else { SetError(CONTENT_E); return false; } }
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const byte* get_buffer() const { return buffer_.get_buffer(); }
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const byte* get_current() const { return &buffer_[current_]; }
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word32 get_index() const { return current_; }
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void set_index(word32 i) { if (i < size()) current_ = i; }
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byte operator[] (word32 i) { current_ = i; return next(); }
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byte next() { if (IsLeft(1)) return buffer_[current_++]; else return 0; }
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byte prev() { if (current_) return buffer_[--current_]; else return 0; }
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void add(const byte* data, word32 len)
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{
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if (IsLeft(len)) {
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memcpy(buffer_.get_buffer() + current_, data, len);
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current_ += len;
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}
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}
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void advance(word32 i) { if (IsLeft(i)) current_ += i; }
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void reset(ByteBlock&);
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Error GetError() { return error_; }
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void SetError(ErrorNumber w) { error_.SetError(w); }
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friend class FileSource; // for get()
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Source(const Source& that)
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: buffer_(that.buffer_), current_(that.current_) {}
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Source& operator=(const Source& that)
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{
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Source tmp(that);
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Swap(tmp);
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return *this;
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}
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void Swap(Source& other)
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{
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buffer_.Swap(other.buffer_);
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STL::swap(current_, other.current_);
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}
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};
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// File Source
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class FileSource {
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FILE* file_;
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public:
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FileSource(const char* fname, Source& source);
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~FileSource();
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word32 size(bool use_current = false);
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private:
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word32 get(Source&);
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word32 size_left();
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FileSource(const FileSource&); // hide
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FileSource& operator=(const FileSource&); // hide
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};
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// File Sink
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class FileSink {
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FILE* file_;
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public:
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FileSink(const char* fname, Source& source);
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~FileSink();
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word32 size(bool use_current = false);
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private:
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size_t put(Source&);
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FileSink(const FileSink&); // hide
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FileSink& operator=(const FileSink&); // hide
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};
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} // namespace
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#endif // TAO_CRYPT_FILE_HPP
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