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/*************************************************************************
** StreamReader.cpp **
** **
** This file is part of dvisvgm -- the DVI to SVG converter **
** Copyright (C) 2005-2011 Martin Gieseking <martin.gieseking@uos.de> **
** **
** 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, see <http://www.gnu.org/licenses/>. **
*************************************************************************/
#include "CRC32.h"
#include "StreamReader.h"
#include "macros.h"
using namespace std;
StreamReader::StreamReader (istream &s)
: is(&s)
{
}
istream& StreamReader::replaceStream (istream &in) {
istream &ret = *is;
is = ∈
return ret;
}
/** Reads an unsigned integer from assigned input stream.
* @param[in] bytes number of bytes to read (max. 4)
* @return read integer */
UInt32 StreamReader::readUnsigned (int bytes) {
UInt32 ret = 0;
for (bytes--; bytes >= 0 && !is->eof(); bytes--) {
UInt32 b = is->get();
ret |= b << (8*bytes);
}
return ret;
}
/** Reads an unsigned integer from assigned input stream and updates the CRC32 checksum.
* @param[in] bytes number of bytes to read (max. 4)
* @param[in,out] crc32 checksum to be updated
* @return read integer */
UInt32 StreamReader::readUnsigned (int bytes, CRC32 &crc32) {
UInt32 ret = readUnsigned(bytes);
crc32.update(ret, bytes);
return ret;
}
/** Reads an signed integer from assigned input stream.
* @param[in] bytes number of bytes to read (max. 4)
* @return read integer */
Int32 StreamReader::readSigned (int bytes) {
Int32 ret = is->get();
if (ret & 128) // negative value?
ret |= 0xffffff00;
for (bytes-=2; bytes >= 0 && !is->eof(); bytes--)
ret = (ret << 8) | is->get();
return ret;
}
/** Reads an signed integer from assigned input stream and updates the CRC32 checksum.
* @param[in] bytes number of bytes to read (max. 4)
* @param[in,out] crc32 checksum to be updated
* @return read integer */
Int32 StreamReader::readSigned (int bytes, CRC32 &crc32) {
Int32 ret = readSigned(bytes);
crc32.update(ret, bytes);
return ret;
}
/** Reads a string terminated by a 0-byte. */
string StreamReader::readString () {
if (!is)
throw StreamReaderException("no stream assigned");
string ret;
while (!is->eof() && is->peek() > 0)
ret += is->get();
is->get(); // skip 0-byte
return ret;
}
/** Reads a string terminated by a 0-byte and updates the CRC32 checksum.
* @param[in,out] crc32 checksum to be updated
* @param[in] finalZero consider final 0-byte in checksum
* @return the string read */
string StreamReader::readString (CRC32 &crc32, bool finalZero) {
string ret = readString();
crc32.update((const UInt8*)ret.c_str(), ret.length());
if (finalZero)
crc32.update(0, 1);
return ret;
}
/** Reads a string of a given length.
* @param[in] length number of characters to read
* @return the string read */
string StreamReader::readString (int length) {
if (!is)
throw StreamReaderException("no stream assigned");
char *buf = new char[length+1];
if (length > 0)
is->get(buf, length+1); // reads 'length' bytes (pos. length+1 is set to 0)
else
*buf = 0;
string ret = buf;
delete [] buf;
return ret;
}
/** Reads a string of a given length and updates the CRC32 checksum.
* @param[in] length number of characters to read
* @param[in,out] crc32 checksum to be updated
* @return the string read */
string StreamReader::readString (int length, CRC32 &crc32) {
string ret = readString(length);
crc32.update(ret.c_str());
return ret;
}
vector<UInt8>& StreamReader::readBytes (int n, vector<UInt8> &bytes) {
if (n > 0)
in().read((char*)&bytes[0], n);
return bytes;
}
vector<UInt8>& StreamReader::readBytes (int n, vector<UInt8> &bytes, CRC32 &crc32) {
readBytes(n, bytes);
crc32.update(&bytes[0], bytes.size());
return bytes;
}
int StreamReader::readByte (CRC32 &crc32) {
int ret = readByte();
if (ret >= 0) {
const UInt8 c = UInt8(ret & 0xff);
crc32.update(&c, 1);
}
return ret;
}
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