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/***************************************************************************
copyright : (C) 2002 - 2008 by Scott Wheeler
email : wheeler@kde.org
***************************************************************************/
/***************************************************************************
* This library is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License version *
* 2.1 as published by the Free Software Foundation. *
* *
* This library 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 *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this library; if not, write to the Free Software *
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA *
* 02110-1301 USA *
* *
* Alternatively, this file is available under the Mozilla Public *
* License Version 1.1. You may obtain a copy of the License at *
* http://www.mozilla.org/MPL/ *
***************************************************************************/
#ifndef TAGLIB_BYTEVECTOR_H
#define TAGLIB_BYTEVECTOR_H
#include "taglib.h"
#include "taglib_export.h"
#include <vector>
#include <iostream>
namespace TagLib {
//! A byte vector
/*!
* This class provides a byte vector with some methods that are useful for
* tagging purposes. Many of the search functions are tailored to what is
* useful for finding tag related paterns in a data array.
*/
class TAGLIB_EXPORT ByteVector
{
public:
#ifndef DO_NOT_DOCUMENT
typedef std::vector<char>::iterator Iterator;
typedef std::vector<char>::const_iterator ConstIterator;
#endif
/*!
* Constructs an empty byte vector.
*/
ByteVector();
/*!
* Construct a vector of size \a size with all values set to \a value by
* default.
*/
ByteVector(uint size, char value = 0);
/*!
* Contructs a byte vector that is a copy of \a v.
*/
ByteVector(const ByteVector &v);
/*!
* Contructs a byte vector that contains \a c.
*/
ByteVector(char c);
/*!
* Constructs a byte vector that copies \a data for up to \a length bytes.
*/
ByteVector(const char *data, uint length);
/*!
* Constructs a byte vector that copies \a data up to the first null
* byte. The behavior is undefined if \a data is not null terminated.
* This is particularly useful for constructing byte arrays from string
* constants.
*/
ByteVector(const char *data);
/*!
* Destroys this ByteVector instance.
*/
virtual ~ByteVector();
/*!
* Sets the data for the byte array using the first \a length bytes of \a data
*/
ByteVector &setData(const char *data, uint length);
/*!
* Sets the data for the byte array copies \a data up to the first null
* byte. The behavior is undefined if \a data is not null terminated.
*/
ByteVector &setData(const char *data);
/*!
* Returns a pointer to the internal data structure.
*
* \warning Care should be taken when modifying this data structure as it is
* easy to corrupt the ByteVector when doing so. Specifically, while the
* data may be changed, its length may not be.
*/
char *data();
/*!
* Returns a pointer to the internal data structure which may not be modified.
*/
const char *data() const;
/*!
* Returns a byte vector made up of the bytes starting at \a index and
* for \a length bytes. If \a length is not specified it will return the bytes
* from \a index to the end of the vector.
*/
ByteVector mid(uint index, uint length = 0xffffffff) const;
/*!
* This essentially performs the same as operator[](), but instead of causing
* a runtime error if the index is out of bounds, it will return a null byte.
*/
char at(uint index) const;
/*!
* Searches the ByteVector for \a pattern starting at \a offset and returns
* the offset. Returns -1 if the pattern was not found. If \a byteAlign is
* specified the pattern will only be matched if it starts on a byte divisible
* by \a byteAlign (starting from \a offset).
*/
int find(const ByteVector &pattern, uint offset = 0, int byteAlign = 1) const;
/*!
* Searches the ByteVector for \a pattern starting from either the end of the
* vector or \a offset and returns the offset. Returns -1 if the pattern was
* not found. If \a byteAlign is specified the pattern will only be matched
* if it starts on a byte divisible by \a byteAlign (starting from \a offset).
*/
int rfind(const ByteVector &pattern, uint offset = 0, int byteAlign = 1) const;
/*!
* Checks to see if the vector contains the \a pattern starting at position
* \a offset. Optionally, if you only want to search for part of the pattern
* you can specify an offset within the pattern to start from. Also, you can
* specify to only check for the first \a patternLength bytes of \a pattern with
* the \a patternLength argument.
*/
bool containsAt(const ByteVector &pattern, uint offset, uint patternOffset = 0, uint patternLength = 0xffffffff) const;
/*!
* Returns true if the vector starts with \a pattern.
*/
bool startsWith(const ByteVector &pattern) const;
/*!
* Returns true if the vector ends with \a pattern.
*/
bool endsWith(const ByteVector &pattern) const;
/*!
* Replaces \a pattern with \a with and returns a reference to the ByteVector
* after the operation. This \e does modify the vector.
*/
ByteVector &replace(const ByteVector &pattern, const ByteVector &with);
/*!
* Checks for a partial match of \a pattern at the end of the vector. It
* returns the offset of the partial match within the vector, or -1 if the
* pattern is not found. This method is particularly useful when searching for
* patterns that start in one vector and end in another. When combined with
* startsWith() it can be used to find a pattern that overlaps two buffers.
*
* \note This will not match the complete pattern at the end of the string; use
* endsWith() for that.
*/
int endsWithPartialMatch(const ByteVector &pattern) const;
/*!
* Appends \a v to the end of the ByteVector.
*/
ByteVector &append(const ByteVector &v);
/*!
* Clears the data.
*/
ByteVector &clear();
/*!
* Returns the size of the array.
*/
uint size() const;
/*!
* Resize the vector to \a size. If the vector is currently less than
* \a size, pad the remaining spaces with \a padding. Returns a reference
* to the resized vector.
*/
ByteVector &resize(uint size, char padding = 0);
/*!
* Returns an Iterator that points to the front of the vector.
*/
Iterator begin();
/*!
* Returns a ConstIterator that points to the front of the vector.
*/
ConstIterator begin() const;
/*!
* Returns an Iterator that points to the back of the vector.
*/
Iterator end();
/*!
* Returns a ConstIterator that points to the back of the vector.
*/
ConstIterator end() const;
/*!
* Returns true if the vector is null.
*
* \note A vector may be empty without being null.
* \see isEmpty()
*/
bool isNull() const;
/*!
* Returns true if the ByteVector is empty.
*
* \see size()
* \see isNull()
*/
bool isEmpty() const;
/*!
* Returns a CRC checksum of the byte vector's data.
*/
uint checksum() const;
/*!
* Converts the first 4 bytes of the vector to an unsigned integer.
*
* If \a mostSignificantByteFirst is true this will operate left to right
* evaluating the integer. For example if \a mostSignificantByteFirst is
* true then $00 $00 $00 $01 == 0x00000001 == 1, if false, $01 00 00 00 ==
* 0x01000000 == 1.
*
* \see fromUInt()
*/
uint toUInt(bool mostSignificantByteFirst = true) const;
/*!
* Converts the first 2 bytes of the vector to a short.
*
* If \a mostSignificantByteFirst is true this will operate left to right
* evaluating the integer. For example if \a mostSignificantByteFirst is
* true then $00 $01 == 0x0001 == 1, if false, $01 00 == 0x01000000 == 1.
*
* \see fromShort()
*/
short toShort(bool mostSignificantByteFirst = true) const;
/*!
* Converts the first 2 bytes of the vector to a unsigned short.
*
* If \a mostSignificantByteFirst is true this will operate left to right
* evaluating the integer. For example if \a mostSignificantByteFirst is
* true then $00 $01 == 0x0001 == 1, if false, $01 00 == 0x01000000 == 1.
*
* \see fromShort()
*/
unsigned short toUShort(bool mostSignificantByteFirst = true) const;
/*!
* Converts the first 8 bytes of the vector to a (signed) long long.
*
* If \a mostSignificantByteFirst is true this will operate left to right
* evaluating the integer. For example if \a mostSignificantByteFirst is
* true then $00 00 00 00 00 00 00 01 == 0x0000000000000001 == 1,
* if false, $01 00 00 00 00 00 00 00 == 0x0100000000000000 == 1.
*
* \see fromUInt()
*/
long long toLongLong(bool mostSignificantByteFirst = true) const;
/*!
* Creates a 4 byte ByteVector based on \a value. If
* \a mostSignificantByteFirst is true, then this will operate left to right
* in building the ByteVector. For example if \a mostSignificantByteFirst is
* true then $00 00 00 01 == 0x00000001 == 1, if false, $01 00 00 00 ==
* 0x01000000 == 1.
*
* \see toUInt()
*/
static ByteVector fromUInt(uint value, bool mostSignificantByteFirst = true);
/*!
* Creates a 2 byte ByteVector based on \a value. If
* \a mostSignificantByteFirst is true, then this will operate left to right
* in building the ByteVector. For example if \a mostSignificantByteFirst is
* true then $00 01 == 0x0001 == 1, if false, $01 00 == 0x0100 == 1.
*
* \see toShort()
*/
static ByteVector fromShort(short value, bool mostSignificantByteFirst = true);
/*!
* Creates a 8 byte ByteVector based on \a value. If
* \a mostSignificantByteFirst is true, then this will operate left to right
* in building the ByteVector. For example if \a mostSignificantByteFirst is
* true then $00 00 00 01 == 0x0000000000000001 == 1, if false,
* $01 00 00 00 00 00 00 00 == 0x0100000000000000 == 1.
*
* \see toLongLong()
*/
static ByteVector fromLongLong(long long value, bool mostSignificantByteFirst = true);
/*!
* Returns a ByteVector based on the CString \a s.
*/
static ByteVector fromCString(const char *s, uint length = 0xffffffff);
/*!
* Returns a const refernence to the byte at \a index.
*/
const char &operator[](int index) const;
/*!
* Returns a reference to the byte at \a index.
*/
char &operator[](int index);
/*!
* Returns true if this ByteVector and \a v are equal.
*/
bool operator==(const ByteVector &v) const;
/*!
* Returns true if this ByteVector and \a v are not equal.
*/
bool operator!=(const ByteVector &v) const;
/*!
* Returns true if this ByteVector and the null terminated C string \a s
* contain the same data.
*/
bool operator==(const char *s) const;
/*!
* Returns true if this ByteVector and the null terminated C string \a s
* do not contain the same data.
*/
bool operator!=(const char *s) const;
/*!
* Returns true if this ByteVector is less than \a v. The value of the
* vectors is determined by evaluating the character from left to right, and
* in the event one vector is a superset of the other, the size is used.
*/
bool operator<(const ByteVector &v) const;
/*!
* Returns true if this ByteVector is greater than \a v.
*/
bool operator>(const ByteVector &v) const;
/*!
* Returns a vector that is \a v appended to this vector.
*/
ByteVector operator+(const ByteVector &v) const;
/*!
* Copies ByteVector \a v.
*/
ByteVector &operator=(const ByteVector &v);
/*!
* Copies ByteVector \a v.
*/
ByteVector &operator=(char c);
/*!
* Copies ByteVector \a v.
*/
ByteVector &operator=(const char *data);
/*!
* A static, empty ByteVector which is convenient and fast (since returning
* an empty or "null" value does not require instantiating a new ByteVector).
*/
static ByteVector null;
/*!
* Returns a hex-encoded copy of the byte vector.
*/
ByteVector toHex() const;
protected:
/*
* If this ByteVector is being shared via implicit sharing, do a deep copy
* of the data and separate from the shared members. This should be called
* by all non-const subclass members.
*/
void detach();
private:
class ByteVectorPrivate;
ByteVectorPrivate *d;
};
}
/*!
* \relates TagLib::ByteVector
* Streams the ByteVector \a v to the output stream \a s.
*/
TAGLIB_EXPORT std::ostream &operator<<(std::ostream &s, const TagLib::ByteVector &v);
#endif