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Diffstat (limited to 'Build/source/texk/dvisvgm/dvisvgm-1.0.11/src/StreamReader.cpp')
| -rw-r--r-- | Build/source/texk/dvisvgm/dvisvgm-1.0.11/src/StreamReader.cpp | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.0.11/src/StreamReader.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.0.11/src/StreamReader.cpp new file mode 100644 index 00000000000..641902d1f0c --- /dev/null +++ b/Build/source/texk/dvisvgm/dvisvgm-1.0.11/src/StreamReader.cpp @@ -0,0 +1,162 @@ +/************************************************************************* +** StreamReader.cpp ** +** ** +** This file is part of dvisvgm -- the DVI to SVG converter ** +** Copyright (C) 2005-2012 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; +} |