340 lines
13 KiB
C++
340 lines
13 KiB
C++
#include "./binaryreader.h"
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#include "../conversion/conversionexception.h"
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#include <memory>
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#include <sstream>
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#include <cstring>
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using namespace std;
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using namespace IoUtilities;
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using namespace ConversionUtilities;
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/*!
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* \namespace IoUtilities
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* \brief Contains utility classes helping to read and write streams.
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*/
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/*!
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* \class IoUtilities::BinaryReader
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* \brief Reads primitive data types from a std::istream.
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* \remarks Supports both, little endian and big endian.
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*/
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/*!
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* \brief Constructs a new BinaryReader.
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* \param stream Specifies the stream to read from.
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*/
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BinaryReader::BinaryReader(istream *stream) :
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m_stream(stream),
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m_ownership(false)
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{}
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/*!
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* \brief Copies the specified BinaryReader.
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* \remarks The copy will not take ownership over the stream.
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*/
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BinaryReader::BinaryReader(const BinaryReader &other) :
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m_stream(other.m_stream),
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m_ownership(false)
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{}
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/*!
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* \brief Destroys the BinaryReader.
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*/
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BinaryReader::~BinaryReader()
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{
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if(m_ownership) {
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delete m_stream;
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}
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}
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/*!
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* \brief Assigns the stream the reader will read from when calling one of the read-methods.
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*
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* You can assign a null pointer when ensuring that none of the read-methods is called
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* until a stream is assigned.
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*
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* \param stream Specifies the stream to be assigned.
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* \param giveOwnership Indicated whether the reader should take ownership (default is false).
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*
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* \sa setStream()
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*/
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void BinaryReader::setStream(istream *stream, bool giveOwnership)
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{
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if(m_ownership) {
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delete m_stream;
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}
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if(stream) {
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m_stream = stream;
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m_ownership = giveOwnership;
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} else {
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m_stream = nullptr;
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m_ownership = false;
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}
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}
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/*!
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* \brief Returns the size of the assigned stream.
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*
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* The size is determined by seeking to the end of the stream and returning this offset.
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*
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* \remarks The method will seek back to the previous offset before returning.
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*/
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istream::pos_type BinaryReader::readStreamsize()
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{
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istream::pos_type cp = m_stream->tellg();
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m_stream->seekg(0, ios_base::end);
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const auto streamsize = m_stream->tellg();
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m_stream->seekg(cp);
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return streamsize;
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}
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/*!
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* \brief Reads a length prefixed string from the current stream.
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*
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* \remarks Reads the length prefix from the stream and then a string of the denoted length.
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* Advances the current position of the stream by the denoted length of the string plus the prefix length.
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*/
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string BinaryReader::readLengthPrefixedString()
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{
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static const int maxPrefixLength = 4;
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int prefixLength = 1;
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byte beg = m_stream->peek();
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byte mask = 0x80;
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while(prefixLength <= maxPrefixLength && (beg & mask) == 0) {
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++prefixLength;
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mask >>= 1;
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}
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if(prefixLength > maxPrefixLength) {
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throw ConversionException("Length denotation of length-prefixed string exceeds maximum.");
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}
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memset(m_buffer, 0, maxPrefixLength);
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m_stream->read(m_buffer + (maxPrefixLength - prefixLength), prefixLength);
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*(m_buffer + (maxPrefixLength - prefixLength)) ^= mask;
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uint32 prefix = BE::toUInt32(m_buffer);
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return readString(prefix);
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}
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/*!
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* \brief Reads a string from the current stream of the given \a length from the stream and advances the current position of the stream by \a length byte.
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*/
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string BinaryReader::readString(size_t length)
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{
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string res;
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res.resize(length);
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m_stream->read(&res[0], length);
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return res;
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}
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/*!
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* \brief Reads a terminated string from the current stream.
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*
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* Advances the current position of the stream by the string length plus one byte.
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*
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* \param termination The byte to be recognized as termination value.
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*/
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string BinaryReader::readTerminatedString(byte termination)
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{
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stringstream ss(ios_base::in | ios_base::out | ios_base::binary);
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ss.exceptions(ios_base::badbit | ios_base::failbit);
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m_stream->get(*ss.rdbuf(), termination); // delim byte is not extracted from the stream
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m_stream->seekg(1, ios_base::cur); // "extract" delim byte manually
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return ss.str();
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}
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/*!
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* \brief Reads a terminated string from the current stream.
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*
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* Advances the current position of the stream by the string length plus one byte
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* but maximal by \a maxBytesToRead.
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*
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* \param maxBytesToRead The maximal number of bytes to read.
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* \param termination The value to be recognized as termination.
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*/
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string BinaryReader::readTerminatedString(size_t maxBytesToRead, byte termination)
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{
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unique_ptr<char []> buff = make_unique<char []>(maxBytesToRead);
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for(char *i = buff.get(), *end = i + maxBytesToRead; i < end; ++i) {
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m_stream->get(*i);
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if(*(reinterpret_cast<byte *>(i)) == termination) {
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return string(buff.get(), i - buff.get());
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}
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}
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return string(buff.get(), maxBytesToRead);
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}
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/*!
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* \brief Reads a multibyte-terminated string from the current stream.
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*
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* Advances the current position of the stream by the string length plus two bytes.
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*
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* \param termination Specifies the two byte sized big endian value to be recognized as termination.
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*/
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string BinaryReader::readMultibyteTerminatedStringBE(uint16 termination)
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{
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stringstream ss(ios_base::in | ios_base::out | ios_base::binary);
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ss.exceptions(ios_base::badbit | ios_base::failbit);
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char *delimChars = m_buffer, *buff = m_buffer + 2;
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ConversionUtilities::BE::getBytes(termination, delimChars);
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do {
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m_stream->get(buff[0]);
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m_stream->get(buff[1]);
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} while(!((buff[0] == delimChars[0]) && (buff[1] == delimChars[1])));
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return ss.str();
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}
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/*!
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* \brief Reads a multibyte-terminated string from the current stream.
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*
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* Advances the current position of the stream by the string length plus two bytes.
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*
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* \param termination Specifies the two byte sized little endian value to be recognized as termination.
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*/
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string BinaryReader::readMultibyteTerminatedStringLE(uint16 termination)
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{
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stringstream ss(ios_base::in | ios_base::out | ios_base::binary);
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ss.exceptions(ios_base::badbit | ios_base::failbit);
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char *delimChars = m_buffer, *buff = m_buffer + 2;
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ConversionUtilities::LE::getBytes(termination, delimChars);
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do {
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m_stream->get(buff[0]);
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m_stream->get(buff[1]);
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} while(!((buff[0] == delimChars[0]) && (buff[1] == delimChars[1])));
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return ss.str();
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}
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/*!
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* \brief Reads a terminated string from the current stream.
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*
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* Advances the current position of the stream by the string length plus two bytes
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* but maximal by \a maxBytesToRead.
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*
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* \param maxBytesToRead The maximal number of bytes to read.
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* \param termination The two byte sized big endian value to be recognized as termination.
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*/
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string BinaryReader::readMultibyteTerminatedStringBE(std::size_t maxBytesToRead, uint16 termination)
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{
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unique_ptr<char []> buff = make_unique<char []>(maxBytesToRead);
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char *delimChars = m_buffer;
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ConversionUtilities::BE::getBytes(termination, delimChars);
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for(char *i = buff.get(), *end = i + maxBytesToRead; (i + 1) < end; i += 2) {
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m_stream->get(*i);
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m_stream->get(*(i + 1));
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if((*i == delimChars[0]) && (*(i + 1) == delimChars[1])) {
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return string(buff.get(), i - buff.get());
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}
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}
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return string(buff.get(), maxBytesToRead);
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}
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/*!
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* \brief Reads a terminated string from the current stream.
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*
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* Advances the current position of the stream by the string length plus two bytes
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* but maximal by \a maxBytesToRead.
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*
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* \param maxBytesToRead The maximal number of bytes to read.
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* \param termination The two byte sized little endian value to be recognized as termination.
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*/
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string BinaryReader::readMultibyteTerminatedStringLE(std::size_t maxBytesToRead, uint16 termination)
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{
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unique_ptr<char []> buff = make_unique<char []>(maxBytesToRead);
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char *delimChars = m_buffer;
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ConversionUtilities::LE::getBytes(termination, delimChars);
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for(char *i = buff.get(), *end = i + maxBytesToRead; (i + 1) < end; i += 2) {
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m_stream->get(*i);
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m_stream->get(*(i + 1));
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if((*i == delimChars[0]) && (*(i + 1) == delimChars[1])) {
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return string(buff.get(), i - buff.get());
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}
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}
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return string(buff.get(), maxBytesToRead);
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}
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/*!
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* \brief Reads \a length bytes from the stream and computes the CRC-32 for that block of data.
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*
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* \remarks Cyclic redundancy check (CRC) is an error-detecting code commonly used in
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* digital networks and storage devices to detect accidental changes to raw data.
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* \remarks Ogg compatible version
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* \sa <a href="http://en.wikipedia.org/wiki/Cyclic_redundancy_check">Cyclic redundancy check - Wikipedia</a>
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*/
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uint32 BinaryReader::readCrc32(size_t length)
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{
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uint32 crc = 0x00;
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for(uint32 i = 0; i < length; ++i) {
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crc = (crc << 8) ^ crc32Table[((crc >> 24) & 0xff) ^ static_cast<byte>(m_stream->get())];
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}
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return crc;
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}
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/*!
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* \brief Reads \a length bytes from the buffer and computes the CRC-32 for that block of data.
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*
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* \remarks Cyclic redundancy check (CRC) is an error-detecting code commonly used in
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* digital networks and storage devices to detect accidental changes to raw data.
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* \remarks Ogg compatible version
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* \sa <a href="http://en.wikipedia.org/wiki/Cyclic_redundancy_check">Cyclic redundancy check - Wikipedia</a>
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*/
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uint32 BinaryReader::computeCrc32(const char *buffer, size_t length)
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{
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uint32 crc = 0x00;
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for(const char *i = buffer, *end = buffer + length; i != end; ++i) {
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crc = (crc << 8) ^ crc32Table[((crc >> 24) & 0xff) ^ static_cast<byte>(*i)];
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}
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return crc;
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}
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/*!
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* \brief CRC-32 table.
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* \remarks Internally used by readCrc32() method.
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* \sa readCrc32()
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*/
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const uint32 BinaryReader::crc32Table[] = {
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0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b,
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0x1a864db2, 0x1e475005, 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
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0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd, 0x4c11db70, 0x48d0c6c7,
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0x4593e01e, 0x4152fda9, 0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
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0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011, 0x791d4014, 0x7ddc5da3,
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0x709f7b7a, 0x745e66cd, 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
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0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, 0xbe2b5b58, 0xbaea46ef,
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0xb7a96036, 0xb3687d81, 0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
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0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49, 0xc7361b4c, 0xc3f706fb,
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0xceb42022, 0xca753d95, 0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
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0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d, 0x34867077, 0x30476dc0,
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0x3d044b19, 0x39c556ae, 0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
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0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16, 0x018aeb13, 0x054bf6a4,
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0x0808d07d, 0x0cc9cdca, 0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
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0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02, 0x5e9f46bf, 0x5a5e5b08,
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0x571d7dd1, 0x53dc6066, 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
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0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b, 0xbb60adfc,
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0xb6238b25, 0xb2e29692, 0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
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0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a, 0xe0b41de7, 0xe4750050,
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0xe9362689, 0xedf73b3e, 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
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0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686, 0xd5b88683, 0xd1799b34,
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0xdc3abded, 0xd8fba05a, 0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
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0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb, 0x4f040d56, 0x4bc510e1,
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0x46863638, 0x42472b8f, 0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
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0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47, 0x36194d42, 0x32d850f5,
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0x3f9b762c, 0x3b5a6b9b, 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
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0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, 0xf12f560e, 0xf5ee4bb9,
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0xf8ad6d60, 0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
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0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f, 0xc423cd6a, 0xc0e2d0dd,
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0xcda1f604, 0xc960ebb3, 0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
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0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b, 0x9b3660c6, 0x9ff77d71,
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0x92b45ba8, 0x9675461f, 0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
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0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640, 0x4e8ee645, 0x4a4ffbf2,
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0x470cdd2b, 0x43cdc09c, 0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
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0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24, 0x119b4be9, 0x155a565e,
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0x18197087, 0x1cd86d30, 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
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0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, 0x2497d08d, 0x2056cd3a,
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0x2d15ebe3, 0x29d4f654, 0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
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0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c, 0xe3a1cbc1, 0xe760d676,
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0xea23f0af, 0xeee2ed18, 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
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0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662,
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0x933eb0bb, 0x97ffad0c, 0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
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0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
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};
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