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//
// VMime library (http://www.vmime.org)
// Copyright (C) 2002 Vincent Richard <vincent@vmime.org>
//
// 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, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// Linking this library statically or dynamically with other modules is making
// a combined work based on this library. Thus, the terms and conditions of
// the GNU General Public License cover the whole combination.
//
#ifndef VMIME_UTILITY_PARSERINPUTSTREAMADAPTER_HPP_INCLUDED
#define VMIME_UTILITY_PARSERINPUTSTREAMADAPTER_HPP_INCLUDED
#include "vmime/utility/seekableInputStream.hpp"
#include <cstring>
namespace vmime {
namespace utility {
/** An adapter class used for parsing from an input stream.
*/
class VMIME_EXPORT parserInputStreamAdapter : public seekableInputStream {
public:
/** @param stream input stream to wrap
*/
parserInputStreamAdapter(const shared_ptr <seekableInputStream>& stream);
shared_ptr <seekableInputStream> getUnderlyingStream();
bool eof() const;
void reset();
size_t read(byte_t* const data, const size_t count);
void seek(const size_t pos) {
m_stream->seek(pos);
}
size_t skip(const size_t count) {
return m_stream->skip(count);
}
size_t getPosition() const {
return m_stream->getPosition();
}
/** Get the byte at the current position without updating the
* current position.
*
* @return byte at the current position
*/
byte_t peekByte() const {
const size_t initialPos = m_stream->getPosition();
try {
byte_t buffer[1];
const size_t readBytes = m_stream->read(buffer, 1);
m_stream->seek(initialPos);
return (readBytes == 1 ? buffer[0] : static_cast <byte_t>(0));
} catch (...) {
m_stream->seek(initialPos);
throw;
}
}
/** Get the byte at the current position and advance current
* position by one byte.
*
* @return byte at the current position
*/
byte_t getByte() {
byte_t buffer[1];
const size_t readBytes = m_stream->read(buffer, 1);
return readBytes == 1 ? buffer[0] : static_cast <byte_t>(0);
}
/** Check whether the bytes following the current position match
* the specified bytes. Position is not updated.
*
* @param bytes bytes to compare
* @param length number of bytes
* @return true if the next bytes match the pattern, false otherwise
*/
template <typename T>
bool matchBytes(const T* bytes, const size_t length) const {
const size_t initialPos = m_stream->getPosition();
try {
byte_t buffer[32];
const size_t readBytes = m_stream->read(buffer, length);
m_stream->seek(initialPos);
return readBytes == length && ::memcmp(bytes, buffer, length) == 0;
} catch (...) {
m_stream->seek(initialPos);
throw;
}
}
const string extract(const size_t begin, const size_t end) const;
/** Skips bytes matching a predicate from the current position.
* The current position is updated to the next following byte
* which does not match the predicate.
*
* @param pred predicate
* @param endPosition stop at this position (or at end of the stream,
* whichever comes first)
* @return number of bytes skipped
*/
template <typename PREDICATE>
size_t skipIf(PREDICATE pred, const size_t endPosition) {
const size_t initialPos = getPosition();
size_t pos = initialPos;
while (!m_stream->eof() && pos < endPosition && pred(getByte())) {
++pos;
}
m_stream->seek(pos);
return pos - initialPos;
}
size_t findNext(const string& token, const size_t startPosition = 0);
private:
mutable shared_ptr <seekableInputStream> m_stream;
};
} // utility
} // vmime
#endif // VMIME_UTILITY_PARSERINPUTSTREAMADAPTER_HPP_INCLUDED
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