/usr/include/eiskaltdcpp/dcpp/Streams.h is in libeiskaltdcpp-dev 2.2.9-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 2001-2012 Jacek Sieka, arnetheduck on gmail point com
*
* 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 2 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.
*/
#pragma once
#include <algorithm>
#include "typedefs.h"
#include "format.h"
#include "SettingsManager.h"
#include "Exception.h"
namespace dcpp {
using std::min;
STANDARD_EXCEPTION(FileException);
/**
* A simple output stream. Intended to be used for nesting streams one inside the other.
*/
class OutputStream {
public:
OutputStream() { }
virtual ~OutputStream() { }
/**
* @return The actual number of bytes written. len bytes will always be
* consumed, but fewer or more bytes may actually be written,
* for example if the stream is being compressed.
*/
virtual size_t write(const void* buf, size_t len) = 0;
/**
* This must be called before destroying the object to make sure all data
* is properly written (we don't want destructors that throw exceptions
* and the last flush might actually throw). Note that some implementations
* might not need it...
*/
virtual size_t flush() = 0;
/**
* @return True if stream is at expected end
*/
virtual bool eof() { return false; }
size_t write(const string& str) { return write(str.c_str(), str.size()); }
private:
OutputStream(const OutputStream&);
OutputStream& operator=(const OutputStream&);
};
class InputStream {
public:
InputStream() { }
virtual ~InputStream() { }
/**
* Call this function until it returns 0 to get all bytes.
* @return The number of bytes read. len reflects the number of bytes
* actually read from the stream source in this call.
*/
virtual size_t read(void* buf, size_t& len) = 0;
private:
InputStream(const InputStream&);
InputStream& operator=(const InputStream&);
};
class MemoryInputStream : public InputStream {
public:
MemoryInputStream(const uint8_t* src, size_t len) : pos(0), size(len), buf(new uint8_t[len]) {
memcpy(buf, src, len);
}
MemoryInputStream(const string& src) : pos(0), size(src.size()), buf(new uint8_t[src.size()]) {
memcpy(buf, src.data(), src.size());
}
virtual ~MemoryInputStream() {
delete[] buf;
}
virtual size_t read(void* tgt, size_t& len) {
len = min(len, size - pos);
memcpy(tgt, buf+pos, len);
pos += len;
return len;
}
size_t getSize() { return size; }
private:
size_t pos;
size_t size;
uint8_t* buf;
};
class IOStream : public InputStream, public OutputStream {
};
template<bool managed>
class LimitedInputStream : public InputStream {
public:
LimitedInputStream(InputStream* is, uint64_t aMaxBytes) : s(is), maxBytes(aMaxBytes) { }
virtual ~LimitedInputStream() { if(managed) delete s; }
size_t read(void* buf, size_t& len) {
len = (size_t)min(maxBytes, (uint64_t)len);
if(len == 0)
return 0;
size_t x = s->read(buf, len);
maxBytes -= x;
return x;
}
private:
InputStream* s;
uint64_t maxBytes;
};
/** Limits the number of bytes that are requested to be written (not the number actually written!) */
template<bool managed>
class LimitedOutputStream : public OutputStream {
public:
LimitedOutputStream(OutputStream* os, uint64_t aMaxBytes) : s(os), maxBytes(aMaxBytes) { }
virtual ~LimitedOutputStream() { if(managed) delete s; }
virtual size_t write(const void* buf, size_t len) {
if(maxBytes < len) {
throw FileException(dgettext("libeiskaltdcpp", "More bytes written than requested"));
}
maxBytes -= len;
return s->write(buf, len);
}
virtual size_t flush() {
return s->flush();
}
virtual bool eof() { return maxBytes == 0; }
private:
OutputStream* s;
uint64_t maxBytes;
};
template<bool managed>
class BufferedOutputStream : public OutputStream {
public:
using OutputStream::write;
BufferedOutputStream(OutputStream* aStream, size_t aBufSize = SETTING(BUFFER_SIZE) * 1024) : s(aStream), pos(0), buf(aBufSize) { }
virtual ~BufferedOutputStream() {
try {
// We must do this in order not to lose bytes when a download
// is disconnected prematurely
flush();
} catch(const Exception&) { }
if(managed) delete s;
}
virtual size_t flush() {
if(pos > 0)
s->write(&buf[0], pos);
pos = 0;
s->flush();
return 0;
}
virtual size_t write(const void* wbuf, size_t len) {
uint8_t* b = (uint8_t*)wbuf;
size_t l2 = len;
size_t bufSize = buf.size();
while(len > 0) {
if(pos == 0 && len >= bufSize) {
s->write(b, len);
break;
} else {
size_t n = min(bufSize - pos, len);
memcpy(&buf[pos], b, n);
b += n;
pos += n;
len -= n;
if(pos == bufSize) {
s->write(&buf[0], bufSize);
pos = 0;
}
}
}
return l2;
}
private:
OutputStream* s;
size_t pos;
ByteVector buf;
};
class StringOutputStream : public OutputStream {
public:
StringOutputStream(string& out) : str(out) { }
virtual ~StringOutputStream() { }
using OutputStream::write;
virtual size_t flush() { return 0; }
virtual size_t write(const void* buf, size_t len) {
str.append((char*)buf, len);
return len;
}
private:
string& str;
};
} // namespace dcpp
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