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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.
//
#include "vmime/utility/parserInputStreamAdapter.hpp"
namespace vmime {
namespace utility {
parserInputStreamAdapter::parserInputStreamAdapter(const shared_ptr <seekableInputStream>& stream)
: m_stream(stream) {
}
bool parserInputStreamAdapter::eof() const {
return m_stream->eof();
}
void parserInputStreamAdapter::reset() {
m_stream->reset();
}
size_t parserInputStreamAdapter::read(byte_t* const data, const size_t count) {
return m_stream->read(data, count);
}
shared_ptr <seekableInputStream> parserInputStreamAdapter::getUnderlyingStream() {
return m_stream;
}
const string parserInputStreamAdapter::extract(const size_t begin, const size_t end) const {
const size_t initialPos = m_stream->getPosition();
byte_t *buffer = NULL;
try {
buffer = new byte_t[end - begin + 1];
m_stream->seek(begin);
const size_t readBytes = m_stream->read(buffer, end - begin);
buffer[readBytes] = '\0';
m_stream->seek(initialPos);
string str(buffer, buffer + readBytes);
delete [] buffer;
return str;
} catch (...) {
delete [] buffer;
m_stream->seek(initialPos);
throw;
}
}
size_t parserInputStreamAdapter::findNext(
const string& token,
const size_t startPosition
) {
static const unsigned int BUFFER_SIZE = 4096;
// Token must not be longer than BUFFER_SIZE/2
if (token.empty() || token.length() > BUFFER_SIZE / 2) {
return npos;
}
const size_t initialPos = getPosition();
seek(startPosition);
try {
byte_t findBuffer[BUFFER_SIZE];
byte_t* findBuffer1 = findBuffer;
byte_t* findBuffer2 = findBuffer + (BUFFER_SIZE / 2);
size_t findBufferLen = 0;
size_t findBufferOffset = 0;
bool isEOF = false;
// Fill in initial buffer
findBufferLen = read(findBuffer, BUFFER_SIZE);
while (findBufferLen != 0) {
// Find token
for (byte_t *begin = findBuffer, *end = findBuffer + findBufferLen - token.length() ;
begin <= end ; ++begin) {
if (begin[0] == token[0] &&
(token.length() == 1 ||
memcmp(static_cast <const void *>(&begin[1]),
static_cast <const void *>(token.data() + 1),
token.length() - 1) == 0)) {
seek(initialPos);
return startPosition + findBufferOffset + (begin - findBuffer);
}
}
// Rotate buffer
memcpy(findBuffer1, findBuffer2, (BUFFER_SIZE / 2));
// Read more bytes
if (findBufferLen < BUFFER_SIZE && (eof() || isEOF)) {
break;
} else {
const size_t bytesRead = read(findBuffer2, BUFFER_SIZE / 2);
if (bytesRead == 0) {
isEOF = true;
}
findBufferLen = (BUFFER_SIZE / 2) + bytesRead;
findBufferOffset += (BUFFER_SIZE / 2);
}
}
seek(initialPos);
} catch (...) {
seek(initialPos);
throw;
}
return npos;
}
} // utility
} // vmime
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