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/*************************************************************************
** StreamReader.cpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2019 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 <algorithm>
#include <vector>
#include "CRC32.hpp"
#include "StreamReader.hpp"
using namespace std;
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_t StreamReader::readUnsigned (int bytes) {
uint32_t ret = 0;
for (bytes--; bytes >= 0 && !_is->eof(); bytes--) {
uint32_t b = uint32_t(_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_t StreamReader::readUnsigned (int bytes, CRC32 &crc32) {
uint32_t 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_t StreamReader::readSigned (int bytes) {
uint32_t ret = uint32_t(_is->get());
if (ret & 128) // negative value?
ret |= 0xffffff00;
for (bytes-=2; bytes >= 0 && !_is->eof(); bytes--)
ret = (ret << 8) | _is->get();
return int32_t(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_t StreamReader::readSigned (int bytes, CRC32 &crc32) {
int32_t ret = readSigned(bytes);
crc32.update(uint32_t(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(reinterpret_cast<const uint8_t*>(ret.data()), 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");
length = max(0, length);
string str(length, '\0');
_is->read(&str[0], length); // read 'length' bytes and append '\0'
return str;
}
/** 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(reinterpret_cast<const uint8_t*>(ret.data()), length);
return ret;
}
vector<uint8_t>& StreamReader::readBytes (int n, vector<uint8_t> &bytes) {
if (n > 0)
_is->read((char*)&bytes[0], n);
return bytes;
}
vector<uint8_t>& StreamReader::readBytes (int n, vector<uint8_t> &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_t c = uint8_t(ret & 0xff);
crc32.update(&c, 1);
}
return ret;
}
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