blob: 178b3b7645b1ac2ef34af9ebd094746260c85d0c [file] [log] [blame]
/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qbytearray.h"
#include "qbytearraymatcher.h"
#include "qtools_p.h"
#include "qstring.h"
#include "qlist.h"
#include "qlocale.h"
#include "qlocale_p.h"
#include "qscopedpointer.h"
#include <qdatastream.h>
#ifndef QT_NO_COMPRESS
#include <zlib.h>
#endif
#include <ctype.h>
#include <limits.h>
#include <string.h>
#include <stdlib.h>
#define IS_RAW_DATA(d) ((d)->data != (d)->array)
QT_BEGIN_NAMESPACE
int qFindByteArray(
const char *haystack0, int haystackLen, int from,
const char *needle0, int needleLen);
int qAllocMore(int alloc, int extra)
{
if (alloc == 0 && extra == 0)
return 0;
const int page = 1 << 12;
int nalloc;
alloc += extra;
if (alloc < 1<<6) {
nalloc = (1<<3) + ((alloc >>3) << 3);
} else {
// don't do anything if the loop will overflow signed int.
if (alloc >= INT_MAX/2)
return INT_MAX;
nalloc = (alloc < page) ? 1 << 3 : page;
while (nalloc < alloc) {
if (nalloc <= 0)
return INT_MAX;
nalloc *= 2;
}
}
return nalloc - extra;
}
/*****************************************************************************
Safe and portable C string functions; extensions to standard string.h
*****************************************************************************/
/*! \relates QByteArray
Returns a duplicate string.
Allocates space for a copy of \a src, copies it, and returns a
pointer to the copy. If \a src is 0, it immediately returns 0.
Ownership is passed to the caller, so the returned string must be
deleted using \c delete[].
*/
char *qstrdup(const char *src)
{
if (!src)
return 0;
char *dst = new char[strlen(src) + 1];
return qstrcpy(dst, src);
}
/*! \relates QByteArray
Copies all the characters up to and including the '\\0' from \a
src into \a dst and returns a pointer to \a dst. If \a src is 0,
it immediately returns 0.
This function assumes that \a dst is large enough to hold the
contents of \a src.
\sa qstrncpy()
*/
char *qstrcpy(char *dst, const char *src)
{
if (!src)
return 0;
#if defined(_MSC_VER) && _MSC_VER >= 1400
int len = qstrlen(src);
// This is actually not secure!!! It will be fixed
// properly in a later release!
if (len >= 0 && strcpy_s(dst, len+1, src) == 0)
return dst;
return 0;
#else
return strcpy(dst, src);
#endif
}
/*! \relates QByteArray
A safe \c strncpy() function.
Copies at most \a len bytes from \a src (stopping at \a len or the
terminating '\\0' whichever comes first) into \a dst and returns a
pointer to \a dst. Guarantees that \a dst is '\\0'-terminated. If
\a src or \a dst is 0, returns 0 immediately.
This function assumes that \a dst is at least \a len characters
long.
\note When compiling with Visual C++ compiler version 14.00
(Visual C++ 2005) or later, internally the function strncpy_s
will be used.
\sa qstrcpy()
*/
char *qstrncpy(char *dst, const char *src, uint len)
{
if (!src || !dst)
return 0;
#if defined(_MSC_VER) && _MSC_VER >= 1400
strncpy_s(dst, len, src, len-1);
#else
strncpy(dst, src, len);
#endif
if (len > 0)
dst[len-1] = '\0';
return dst;
}
/*! \fn uint qstrlen(const char *str)
\relates QByteArray
A safe \c strlen() function.
Returns the number of characters that precede the terminating '\\0',
or 0 if \a str is 0.
\sa qstrnlen()
*/
/*! \fn uint qstrnlen(const char *str, uint maxlen)
\relates QByteArray
\since 4.2
A safe \c strnlen() function.
Returns the number of characters that precede the terminating '\\0', but
at most \a maxlen. If \a str is 0, returns 0.
\sa qstrlen()
*/
/*!
\relates QByteArray
A safe \c strcmp() function.
Compares \a str1 and \a str2. Returns a negative value if \a str1
is less than \a str2, 0 if \a str1 is equal to \a str2 or a
positive value if \a str1 is greater than \a str2.
Special case 1: Returns 0 if \a str1 and \a str2 are both 0.
Special case 2: Returns an arbitrary non-zero value if \a str1 is 0
or \a str2 is 0 (but not both).
\sa qstrncmp(), qstricmp(), qstrnicmp(), {8-bit Character Comparisons}
*/
int qstrcmp(const char *str1, const char *str2)
{
return (str1 && str2) ? strcmp(str1, str2)
: (str1 ? 1 : (str2 ? -1 : 0));
}
/*! \fn int qstrncmp(const char *str1, const char *str2, uint len);
\relates QByteArray
A safe \c strncmp() function.
Compares at most \a len bytes of \a str1 and \a str2.
Returns a negative value if \a str1 is less than \a str2, 0 if \a
str1 is equal to \a str2 or a positive value if \a str1 is greater
than \a str2.
Special case 1: Returns 0 if \a str1 and \a str2 are both 0.
Special case 2: Returns a random non-zero value if \a str1 is 0
or \a str2 is 0 (but not both).
\sa qstrcmp(), qstricmp(), qstrnicmp(), {8-bit Character Comparisons}
*/
/*! \relates QByteArray
A safe \c stricmp() function.
Compares \a str1 and \a str2 ignoring the case of the
characters. The encoding of the strings is assumed to be Latin-1.
Returns a negative value if \a str1 is less than \a str2, 0 if \a
str1 is equal to \a str2 or a positive value if \a str1 is greater
than \a str2.
Special case 1: Returns 0 if \a str1 and \a str2 are both 0.
Special case 2: Returns a random non-zero value if \a str1 is 0
or \a str2 is 0 (but not both).
\sa qstrcmp(), qstrncmp(), qstrnicmp(), {8-bit Character Comparisons}
*/
int qstricmp(const char *str1, const char *str2)
{
register const uchar *s1 = reinterpret_cast<const uchar *>(str1);
register const uchar *s2 = reinterpret_cast<const uchar *>(str2);
int res;
uchar c;
if (!s1 || !s2)
return s1 ? 1 : (s2 ? -1 : 0);
for (; !(res = (c = QChar::toLower((ushort)*s1)) - QChar::toLower((ushort)*s2)); s1++, s2++)
if (!c) // strings are equal
break;
return res;
}
/*! \relates QByteArray
A safe \c strnicmp() function.
Compares at most \a len bytes of \a str1 and \a str2 ignoring the
case of the characters. The encoding of the strings is assumed to
be Latin-1.
Returns a negative value if \a str1 is less than \a str2, 0 if \a str1
is equal to \a str2 or a positive value if \a str1 is greater than \a
str2.
Special case 1: Returns 0 if \a str1 and \a str2 are both 0.
Special case 2: Returns a random non-zero value if \a str1 is 0
or \a str2 is 0 (but not both).
\sa qstrcmp(), qstrncmp(), qstricmp(), {8-bit Character Comparisons}
*/
int qstrnicmp(const char *str1, const char *str2, uint len)
{
register const uchar *s1 = reinterpret_cast<const uchar *>(str1);
register const uchar *s2 = reinterpret_cast<const uchar *>(str2);
int res;
uchar c;
if (!s1 || !s2)
return s1 ? 1 : (s2 ? -1 : 0);
for (; len--; s1++, s2++) {
if ((res = (c = QChar::toLower((ushort)*s1)) - QChar::toLower((ushort)*s2)))
return res;
if (!c) // strings are equal
break;
}
return 0;
}
/*!
\internal
*/
int qstrcmp(const QByteArray &str1, const char *str2)
{
if (!str2)
return str1.isEmpty() ? 0 : +1;
const char *str1data = str1.constData();
const char *str1end = str1data + str1.length();
for ( ; str1data < str1end && *str2; ++str1data, ++str2) {
register int diff = int(uchar(*str1data)) - uchar(*str2);
if (diff)
// found a difference
return diff;
}
// Why did we stop?
if (*str2 != '\0')
// not the null, so we stopped because str1 is shorter
return -1;
if (str1data < str1end)
// we haven't reached the end, so str1 must be longer
return +1;
return 0;
}
/*!
\internal
*/
int qstrcmp(const QByteArray &str1, const QByteArray &str2)
{
int l1 = str1.length();
int l2 = str2.length();
int ret = memcmp(str1, str2, qMin(l1, l2));
if (ret != 0)
return ret;
// they matched qMin(l1, l2) bytes
// so the longer one is lexically after the shorter one
return l1 - l2;
}
// the CRC table below is created by the following piece of code
#if 0
static void createCRC16Table() // build CRC16 lookup table
{
register unsigned int i;
register unsigned int j;
unsigned short crc_tbl[16];
unsigned int v0, v1, v2, v3;
for (i = 0; i < 16; i++) {
v0 = i & 1;
v1 = (i >> 1) & 1;
v2 = (i >> 2) & 1;
v3 = (i >> 3) & 1;
j = 0;
#undef SET_BIT
#define SET_BIT(x, b, v) (x) |= (v) << (b)
SET_BIT(j, 0, v0);
SET_BIT(j, 7, v0);
SET_BIT(j, 12, v0);
SET_BIT(j, 1, v1);
SET_BIT(j, 8, v1);
SET_BIT(j, 13, v1);
SET_BIT(j, 2, v2);
SET_BIT(j, 9, v2);
SET_BIT(j, 14, v2);
SET_BIT(j, 3, v3);
SET_BIT(j, 10, v3);
SET_BIT(j, 15, v3);
crc_tbl[i] = j;
}
printf("static const quint16 crc_tbl[16] = {\n");
for (int i = 0; i < 16; i +=4)
printf(" 0x%04x, 0x%04x, 0x%04x, 0x%04x,\n", crc_tbl[i], crc_tbl[i+1], crc_tbl[i+2], crc_tbl[i+3]);
printf("};\n");
}
#endif
static const quint16 crc_tbl[16] = {
0x0000, 0x1081, 0x2102, 0x3183,
0x4204, 0x5285, 0x6306, 0x7387,
0x8408, 0x9489, 0xa50a, 0xb58b,
0xc60c, 0xd68d, 0xe70e, 0xf78f
};
/*!
\relates QByteArray
Returns the CRC-16 checksum of the first \a len bytes of \a data.
The checksum is independent of the byte order (endianness).
\note This function is a 16-bit cache conserving (16 entry table)
implementation of the CRC-16-CCITT algorithm.
*/
quint16 qChecksum(const char *data, uint len)
{
register quint16 crc = 0xffff;
uchar c;
const uchar *p = reinterpret_cast<const uchar *>(data);
while (len--) {
c = *p++;
crc = ((crc >> 4) & 0x0fff) ^ crc_tbl[((crc ^ c) & 15)];
c >>= 4;
crc = ((crc >> 4) & 0x0fff) ^ crc_tbl[((crc ^ c) & 15)];
}
return ~crc & 0xffff;
}
/*!
\fn QByteArray qCompress(const QByteArray& data, int compressionLevel)
\relates QByteArray
Compresses the \a data byte array and returns the compressed data
in a new byte array.
The \a compressionLevel parameter specifies how much compression
should be used. Valid values are between 0 and 9, with 9
corresponding to the greatest compression (i.e. smaller compressed
data) at the cost of using a slower algorithm. Smaller values (8,
7, ..., 1) provide successively less compression at slightly
faster speeds. The value 0 corresponds to no compression at all.
The default value is -1, which specifies zlib's default
compression.
\sa qUncompress()
*/
/*! \relates QByteArray
\overload
Compresses the first \a nbytes of \a data and returns the
compressed data in a new byte array.
*/
#ifndef QT_NO_COMPRESS
QByteArray qCompress(const uchar* data, int nbytes, int compressionLevel)
{
if (nbytes == 0) {
return QByteArray(4, '\0');
}
if (!data) {
qWarning("qCompress: Data is null");
return QByteArray();
}
if (compressionLevel < -1 || compressionLevel > 9)
compressionLevel = -1;
ulong len = nbytes + nbytes / 100 + 13;
QByteArray bazip;
int res;
do {
bazip.resize(len + 4);
res = ::compress2((uchar*)bazip.data()+4, &len, (uchar*)data, nbytes, compressionLevel);
switch (res) {
case Z_OK:
bazip.resize(len + 4);
bazip[0] = (nbytes & 0xff000000) >> 24;
bazip[1] = (nbytes & 0x00ff0000) >> 16;
bazip[2] = (nbytes & 0x0000ff00) >> 8;
bazip[3] = (nbytes & 0x000000ff);
break;
case Z_MEM_ERROR:
qWarning("qCompress: Z_MEM_ERROR: Not enough memory");
bazip.resize(0);
break;
case Z_BUF_ERROR:
len *= 2;
break;
}
} while (res == Z_BUF_ERROR);
return bazip;
}
#endif
/*!
\fn QByteArray qUncompress(const QByteArray &data)
\relates QByteArray
Uncompresses the \a data byte array and returns a new byte array
with the uncompressed data.
Returns an empty QByteArray if the input data was corrupt.
This function will uncompress data compressed with qCompress()
from this and any earlier Qt version, back to Qt 3.1 when this
feature was added.
\bold{Note:} If you want to use this function to uncompress external
data that was compressed using zlib, you first need to prepend a four
byte header to the byte array containing the data. The header must
contain the expected length (in bytes) of the uncompressed data,
expressed as an unsigned, big-endian, 32-bit integer.
\sa qCompress()
*/
/*! \relates QByteArray
\overload
Uncompresses the first \a nbytes of \a data and returns a new byte
array with the uncompressed data.
*/
#ifndef QT_NO_COMPRESS
QByteArray qUncompress(const uchar* data, int nbytes)
{
if (!data) {
qWarning("qUncompress: Data is null");
return QByteArray();
}
if (nbytes <= 4) {
if (nbytes < 4 || (data[0]!=0 || data[1]!=0 || data[2]!=0 || data[3]!=0))
qWarning("qUncompress: Input data is corrupted");
return QByteArray();
}
ulong expectedSize = (data[0] << 24) | (data[1] << 16) |
(data[2] << 8) | (data[3] );
ulong len = qMax(expectedSize, 1ul);
QScopedPointer<QByteArray::Data, QScopedPointerPodDeleter> d;
forever {
ulong alloc = len;
d.reset(q_check_ptr(static_cast<QByteArray::Data *>(qRealloc(d.take(), sizeof(QByteArray::Data) + alloc))));
if (!d) {
// we are not allowed to crash here when compiling with QT_NO_EXCEPTIONS
qWarning("qUncompress: could not allocate enough memory to uncompress data");
return QByteArray();
}
int res = ::uncompress((uchar*)d->array, &len,
(uchar*)data+4, nbytes-4);
switch (res) {
case Z_OK:
if (len != alloc) {
d.reset(q_check_ptr(static_cast<QByteArray::Data *>(qRealloc(d.take(), sizeof(QByteArray::Data) + len))));
if (!d) {
// we are not allowed to crash here when compiling with QT_NO_EXCEPTIONS
qWarning("qUncompress: could not allocate enough memory to uncompress data");
return QByteArray();
}
}
d->ref = 1;
d->alloc = d->size = len;
d->data = d->array;
d->array[len] = 0;
return QByteArray(d.take(), 0, 0);
case Z_MEM_ERROR:
qWarning("qUncompress: Z_MEM_ERROR: Not enough memory");
return QByteArray();
case Z_BUF_ERROR:
len *= 2;
continue;
case Z_DATA_ERROR:
qWarning("qUncompress: Z_DATA_ERROR: Input data is corrupted");
return QByteArray();
}
}
}
#endif
static inline bool qIsUpper(char c)
{
return c >= 'A' && c <= 'Z';
}
static inline char qToLower(char c)
{
if (c >= 'A' && c <= 'Z')
return c - 'A' + 'a';
else
return c;
}
QByteArray::Data QByteArray::shared_null = {Q_BASIC_ATOMIC_INITIALIZER(1),
0, 0, shared_null.array, {0} };
QByteArray::Data QByteArray::shared_empty = { Q_BASIC_ATOMIC_INITIALIZER(1),
0, 0, shared_empty.array, {0} };
/*!
\class QByteArray
\brief The QByteArray class provides an array of bytes.
\ingroup tools
\ingroup shared
\ingroup string-processing
\reentrant
QByteArray can be used to store both raw bytes (including '\\0's)
and traditional 8-bit '\\0'-terminated strings. Using QByteArray
is much more convenient than using \c{const char *}. Behind the
scenes, it always ensures that the data is followed by a '\\0'
terminator, and uses \l{implicit sharing} (copy-on-write) to
reduce memory usage and avoid needless copying of data.
In addition to QByteArray, Qt also provides the QString class to
store string data. For most purposes, QString is the class you
want to use. It stores 16-bit Unicode characters, making it easy
to store non-ASCII/non-Latin-1 characters in your application.
Furthermore, QString is used throughout in the Qt API. The two
main cases where QByteArray is appropriate are when you need to
store raw binary data, and when memory conservation is critical
(e.g., with Qt for Embedded Linux).
One way to initialize a QByteArray is simply to pass a \c{const
char *} to its constructor. For example, the following code
creates a byte array of size 5 containing the data "Hello":
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 0
Although the size() is 5, the byte array also maintains an extra
'\\0' character at the end so that if a function is used that
asks for a pointer to the underlying data (e.g. a call to
data()), the data pointed to is guaranteed to be
'\\0'-terminated.
QByteArray makes a deep copy of the \c{const char *} data, so you
can modify it later without experiencing side effects. (If for
performance reasons you don't want to take a deep copy of the
character data, use QByteArray::fromRawData() instead.)
Another approach is to set the size of the array using resize()
and to initialize the data byte per byte. QByteArray uses 0-based
indexes, just like C++ arrays. To access the byte at a particular
index position, you can use operator[](). On non-const byte
arrays, operator[]() returns a reference to a byte that can be
used on the left side of an assignment. For example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 1
For read-only access, an alternative syntax is to use at():
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 2
at() can be faster than operator[](), because it never causes a
\l{deep copy} to occur.
To extract many bytes at a time, use left(), right(), or mid().
A QByteArray can embed '\\0' bytes. The size() function always
returns the size of the whole array, including embedded '\\0'
bytes. If you want to obtain the length of the data up to and
excluding the first '\\0' character, call qstrlen() on the byte
array.
After a call to resize(), newly allocated bytes have undefined
values. To set all the bytes to a particular value, call fill().
To obtain a pointer to the actual character data, call data() or
constData(). These functions return a pointer to the beginning of
the data. The pointer is guaranteed to remain valid until a
non-const function is called on the QByteArray. It is also
guaranteed that the data ends with a '\\0' byte. This '\\0' byte
is automatically provided by QByteArray and is not counted in
size().
QByteArray provides the following basic functions for modifying
the byte data: append(), prepend(), insert(), replace(), and
remove(). For example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 3
The replace() and remove() functions' first two arguments are the
position from which to start erasing and the number of bytes that
should be erased.
When you append() data to a non-empty array, the array will be
reallocated and the new data copied to it. You can avoid this
behavior by calling reserve(), which preallocates a certain amount
of memory. You can also call capacity() to find out how much
memory QByteArray actually allocated. Data appended to an empty
array is not copied.
A frequent requirement is to remove whitespace characters from a
byte array ('\\n', '\\t', ' ', etc.). If you want to remove
whitespace from both ends of a QByteArray, use trimmed(). If you
want to remove whitespace from both ends and replace multiple
consecutive whitespaces with a single space character within the
byte array, use simplified().
If you want to find all occurrences of a particular character or
substring in a QByteArray, use indexOf() or lastIndexOf(). The
former searches forward starting from a given index position, the
latter searches backward. Both return the index position of the
character or substring if they find it; otherwise, they return -1.
For example, here's a typical loop that finds all occurrences of a
particular substring:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 4
If you simply want to check whether a QByteArray contains a
particular character or substring, use contains(). If you want to
find out how many times a particular character or substring
occurs in the byte array, use count(). If you want to replace all
occurrences of a particular value with another, use one of the
two-parameter replace() overloads.
QByteArrays can be compared using overloaded operators such as
operator<(), operator<=(), operator==(), operator>=(), and so on.
The comparison is based exclusively on the numeric values
of the characters and is very fast, but is not what a human would
expect. QString::localeAwareCompare() is a better choice for
sorting user-interface strings.
For historical reasons, QByteArray distinguishes between a null
byte array and an empty byte array. A \e null byte array is a
byte array that is initialized using QByteArray's default
constructor or by passing (const char *)0 to the constructor. An
\e empty byte array is any byte array with size 0. A null byte
array is always empty, but an empty byte array isn't necessarily
null:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 5
All functions except isNull() treat null byte arrays the same as
empty byte arrays. For example, data() returns a pointer to a
'\\0' character for a null byte array (\e not a null pointer),
and QByteArray() compares equal to QByteArray(""). We recommend
that you always use isEmpty() and avoid isNull().
\section1 Notes on Locale
\section2 Number-String Conversions
Functions that perform conversions between numeric data types and
strings are performed in the C locale, irrespective of the user's
locale settings. Use QString to perform locale-aware conversions
between numbers and strings.
\section2 8-bit Character Comparisons
In QByteArray, the notion of uppercase and lowercase and of which
character is greater than or less than another character is
locale dependent. This affects functions that support a case
insensitive option or that compare or lowercase or uppercase
their arguments. Case insensitive operations and comparisons will
be accurate if both strings contain only ASCII characters. (If \c
$LC_CTYPE is set, most Unix systems do "the right thing".)
Functions that this affects include contains(), indexOf(),
lastIndexOf(), operator<(), operator<=(), operator>(),
operator>=(), toLower() and toUpper().
This issue does not apply to QStrings since they represent
characters using Unicode.
\sa QString, QBitArray
*/
/*! \fn QByteArray::iterator QByteArray::begin()
\internal
*/
/*! \fn QByteArray::const_iterator QByteArray::begin() const
\internal
*/
/*! \fn QByteArray::const_iterator QByteArray::constBegin() const
\internal
*/
/*! \fn QByteArray::iterator QByteArray::end()
\internal
*/
/*! \fn QByteArray::const_iterator QByteArray::end() const
\internal
*/
/*! \fn QByteArray::const_iterator QByteArray::constEnd() const
\internal
*/
/*! \fn void QByteArray::push_back(const QByteArray &other)
This function is provided for STL compatibility. It is equivalent
to append(\a other).
*/
/*! \fn void QByteArray::push_back(const char *str)
\overload
Same as append(\a str).
*/
/*! \fn void QByteArray::push_back(char ch)
\overload
Same as append(\a ch).
*/
/*! \fn void QByteArray::push_front(const QByteArray &other)
This function is provided for STL compatibility. It is equivalent
to prepend(\a other).
*/
/*! \fn void QByteArray::push_front(const char *str)
\overload
Same as prepend(\a str).
*/
/*! \fn void QByteArray::push_front(char ch)
\overload
Same as prepend(\a ch).
*/
/*! \fn QByteArray::QByteArray(const QByteArray &other)
Constructs a copy of \a other.
This operation takes \l{constant time}, because QByteArray is
\l{implicitly shared}. This makes returning a QByteArray from a
function very fast. If a shared instance is modified, it will be
copied (copy-on-write), taking \l{linear time}.
\sa operator=()
*/
/*! \fn QByteArray::~QByteArray()
Destroys the byte array.
*/
/*!
Assigns \a other to this byte array and returns a reference to
this byte array.
*/
QByteArray &QByteArray::operator=(const QByteArray & other)
{
other.d->ref.ref();
if (!d->ref.deref())
qFree(d);
d = other.d;
return *this;
}
/*!
\overload
Assigns \a str to this byte array.
*/
QByteArray &QByteArray::operator=(const char *str)
{
Data *x;
if (!str) {
x = &shared_null;
} else if (!*str) {
x = &shared_empty;
} else {
int len = qstrlen(str);
if (d->ref != 1 || len > d->alloc || (len < d->size && len < d->alloc >> 1))
realloc(len);
x = d;
memcpy(x->data, str, len + 1); // include null terminator
x->size = len;
}
x->ref.ref();
if (!d->ref.deref())
qFree(d);
d = x;
return *this;
}
/*! \fn int QByteArray::size() const
Returns the number of bytes in this byte array.
The last byte in the byte array is at position size() - 1. In
addition, QByteArray ensures that the byte at position size() is
always '\\0', so that you can use the return value of data() and
constData() as arguments to functions that expect '\\0'-terminated
strings.
Example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 6
\sa isEmpty(), resize()
*/
/*! \fn bool QByteArray::isEmpty() const
Returns true if the byte array has size 0; otherwise returns false.
Example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 7
\sa size()
*/
/*! \fn int QByteArray::capacity() const
Returns the maximum number of bytes that can be stored in the
byte array without forcing a reallocation.
The sole purpose of this function is to provide a means of fine
tuning QByteArray's memory usage. In general, you will rarely
ever need to call this function. If you want to know how many
bytes are in the byte array, call size().
\sa reserve(), squeeze()
*/
/*! \fn void QByteArray::reserve(int size)
Attempts to allocate memory for at least \a size bytes. If you
know in advance how large the byte array will be, you can call
this function, and if you call resize() often you are likely to
get better performance. If \a size is an underestimate, the worst
that will happen is that the QByteArray will be a bit slower.
The sole purpose of this function is to provide a means of fine
tuning QByteArray's memory usage. In general, you will rarely
ever need to call this function. If you want to change the size
of the byte array, call resize().
\sa squeeze(), capacity()
*/
/*! \fn void QByteArray::squeeze()
Releases any memory not required to store the array's data.
The sole purpose of this function is to provide a means of fine
tuning QByteArray's memory usage. In general, you will rarely
ever need to call this function.
\sa reserve(), capacity()
*/
/*! \fn QByteArray::operator const char *() const
\fn QByteArray::operator const void *() const
Returns a pointer to the data stored in the byte array. The
pointer can be used to access the bytes that compose the array.
The data is '\\0'-terminated. The pointer remains valid as long
as the array isn't reallocated or destroyed.
This operator is mostly useful to pass a byte array to a function
that accepts a \c{const char *}.
You can disable this operator by defining \c
QT_NO_CAST_FROM_BYTEARRAY when you compile your applications.
Note: A QByteArray can store any byte values including '\\0's,
but most functions that take \c{char *} arguments assume that the
data ends at the first '\\0' they encounter.
\sa constData()
*/
/*!
\macro QT_NO_CAST_FROM_BYTEARRAY
\relates QByteArray
Disables automatic conversions from QByteArray to
const char * or const void *.
\sa QT_NO_CAST_TO_ASCII, QT_NO_CAST_FROM_ASCII
*/
/*! \fn char *QByteArray::data()
Returns a pointer to the data stored in the byte array. The
pointer can be used to access and modify the bytes that compose
the array. The data is '\\0'-terminated, i.e. the number of
bytes in the returned character string is size() + 1 for the
'\\0' terminator.
Example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 8
The pointer remains valid as long as the byte array isn't
reallocated or destroyed. For read-only access, constData() is
faster because it never causes a \l{deep copy} to occur.
This function is mostly useful to pass a byte array to a function
that accepts a \c{const char *}.
The following example makes a copy of the char* returned by
data(), but it will corrupt the heap and cause a crash because it
does not allocate a byte for the '\\0' at the end:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 46
This one allocates the correct amount of space:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 47
Note: A QByteArray can store any byte values including '\\0's,
but most functions that take \c{char *} arguments assume that the
data ends at the first '\\0' they encounter.
\sa constData(), operator[]()
*/
/*! \fn const char *QByteArray::data() const
\overload
*/
/*! \fn const char *QByteArray::constData() const
Returns a pointer to the data stored in the byte array. The
pointer can be used to access the bytes that compose the array.
The data is '\\0'-terminated. The pointer remains valid as long
as the byte array isn't reallocated or destroyed.
This function is mostly useful to pass a byte array to a function
that accepts a \c{const char *}.
Note: A QByteArray can store any byte values including '\\0's,
but most functions that take \c{char *} arguments assume that the
data ends at the first '\\0' they encounter.
\sa data(), operator[]()
*/
/*! \fn void QByteArray::detach()
\internal
*/
/*! \fn bool QByteArray::isDetached() const
\internal
*/
/*! \fn bool QByteArray::isSharedWith(const QByteArray &other) const
\internal
*/
/*! \fn char QByteArray::at(int i) const
Returns the character at index position \a i in the byte array.
\a i must be a valid index position in the byte array (i.e., 0 <=
\a i < size()).
\sa operator[]()
*/
/*! \fn QByteRef QByteArray::operator[](int i)
Returns the byte at index position \a i as a modifiable reference.
If an assignment is made beyond the end of the byte array, the
array is extended with resize() before the assignment takes
place.
Example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 9
The return value is of type QByteRef, a helper class for
QByteArray. When you get an object of type QByteRef, you can use
it as if it were a char &. If you assign to it, the assignment
will apply to the character in the QByteArray from which you got
the reference.
\sa at()
*/
/*! \fn char QByteArray::operator[](int i) const
\overload
Same as at(\a i).
*/
/*! \fn QByteRef QByteArray::operator[](uint i)
\overload
*/
/*! \fn char QByteArray::operator[](uint i) const
\overload
*/
/*! \fn QBool QByteArray::contains(const QByteArray &ba) const
Returns true if the byte array contains an occurrence of the byte
array \a ba; otherwise returns false.
\sa indexOf(), count()
*/
/*! \fn QBool QByteArray::contains(const char *str) const
\overload
Returns true if the byte array contains the string \a str;
otherwise returns false.
*/
/*! \fn QBool QByteArray::contains(char ch) const
\overload
Returns true if the byte array contains the character \a ch;
otherwise returns false.
*/
/*!
Truncates the byte array at index position \a pos.
If \a pos is beyond the end of the array, nothing happens.
Example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 10
\sa chop(), resize(), left()
*/
void QByteArray::truncate(int pos)
{
if (pos < d->size)
resize(pos);
}
/*!
Removes \a n bytes from the end of the byte array.
If \a n is greater than size(), the result is an empty byte
array.
Example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 11
\sa truncate(), resize(), left()
*/
void QByteArray::chop(int n)
{
if (n > 0)
resize(d->size - n);
}
/*! \fn QByteArray &QByteArray::operator+=(const QByteArray &ba)
Appends the byte array \a ba onto the end of this byte array and
returns a reference to this byte array.
Example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 12
Note: QByteArray is an \l{implicitly shared} class. Consequently,
if \e this is an empty QByteArray, then \e this will just share
the data held in \a ba. In this case, no copying of data is done,
taking \l{constant time}. If a shared instance is modified, it will
be copied (copy-on-write), taking \l{linear time}.
If \e this is not an empty QByteArray, a deep copy of the data is
performed, taking \l{linear time}.
This operation typically does not suffer from allocation overhead,
because QByteArray preallocates extra space at the end of the data
so that it may grow without reallocating for each append operation.
\sa append(), prepend()
*/
/*! \fn QByteArray &QByteArray::operator+=(const QString &str)
\overload
Appends the string \a str onto the end of this byte array and
returns a reference to this byte array. The Unicode data is
converted into 8-bit characters using QString::toAscii().
If the QString contains non-ASCII Unicode characters, using this
operator can lead to loss of information. You can disable this
operator by defining \c QT_NO_CAST_TO_ASCII when you compile your
applications. You then need to call QString::toAscii() (or
QString::toLatin1() or QString::toUtf8() or QString::toLocal8Bit())
explicitly if you want to convert the data to \c{const char *}.
*/
/*! \fn QByteArray &QByteArray::operator+=(const char *str)
\overload
Appends the string \a str onto the end of this byte array and
returns a reference to this byte array.
*/
/*! \fn QByteArray &QByteArray::operator+=(char ch)
\overload
Appends the character \a ch onto the end of this byte array and
returns a reference to this byte array.
*/
/*! \fn int QByteArray::length() const
Same as size().
*/
/*! \fn bool QByteArray::isNull() const
Returns true if this byte array is null; otherwise returns false.
Example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 13
Qt makes a distinction between null byte arrays and empty byte
arrays for historical reasons. For most applications, what
matters is whether or not a byte array contains any data,
and this can be determined using isEmpty().
\sa isEmpty()
*/
/*! \fn QByteArray::QByteArray()
Constructs an empty byte array.
\sa isEmpty()
*/
/*! \fn QByteArray::QByteArray(const char *str)
Constructs a byte array initialized with the string \a str.
QByteArray makes a deep copy of the string data.
*/
QByteArray::QByteArray(const char *str)
{
if (!str) {
d = &shared_null;
} else if (!*str) {
d = &shared_empty;
} else {
int len = qstrlen(str);
d = static_cast<Data *>(qMalloc(sizeof(Data)+len));
Q_CHECK_PTR(d);
d->ref = 0;;
d->alloc = d->size = len;
d->data = d->array;
memcpy(d->array, str, len+1); // include null terminator
}
d->ref.ref();
}
/*!
Constructs a byte array containing the first \a size bytes of
array \a data.
If \a data is 0, a null byte array is constructed.
QByteArray makes a deep copy of the string data.
\sa fromRawData()
*/
QByteArray::QByteArray(const char *data, int size)
{
if (!data) {
d = &shared_null;
} else if (size <= 0) {
d = &shared_empty;
} else {
d = static_cast<Data *>(qMalloc(sizeof(Data) + size));
Q_CHECK_PTR(d);
d->ref = 0;
d->alloc = d->size = size;
d->data = d->array;
memcpy(d->array, data, size);
d->array[size] = '\0';
}
d->ref.ref();
}
/*!
Constructs a byte array of size \a size with every byte set to
character \a ch.
\sa fill()
*/
QByteArray::QByteArray(int size, char ch)
{
if (size <= 0) {
d = &shared_null;
} else {
d = static_cast<Data *>(qMalloc(sizeof(Data)+size));
Q_CHECK_PTR(d);
d->ref = 0;
d->alloc = d->size = size;
d->data = d->array;
d->array[size] = '\0';
memset(d->array, ch, size);
}
d->ref.ref();
}
/*!
\internal
Constructs a byte array of size \a size with uninitialized contents.
*/
QByteArray::QByteArray(int size, Qt::Initialization)
{
d = static_cast<Data *>(qMalloc(sizeof(Data)+size));
Q_CHECK_PTR(d);
d->ref = 1;
d->alloc = d->size = size;
d->data = d->array;
d->array[size] = '\0';
}
/*!
Sets the size of the byte array to \a size bytes.
If \a size is greater than the current size, the byte array is
extended to make it \a size bytes with the extra bytes added to
the end. The new bytes are uninitialized.
If \a size is less than the current size, bytes are removed from
the end.
\sa size(), truncate()
*/
void QByteArray::resize(int size)
{
if (size <= 0) {
Data *x = &shared_empty;
x->ref.ref();
if (!d->ref.deref())
qFree(d);
d = x;
} else if (d == &shared_null) {
//
// Optimize the idiom:
// QByteArray a;
// a.resize(sz);
// ...
// which is used in place of the Qt 3 idiom:
// QByteArray a(sz);
//
Data *x = static_cast<Data *>(qMalloc(sizeof(Data)+size));
Q_CHECK_PTR(x);
x->ref = 1;
x->alloc = x->size = size;
x->data = x->array;
x->array[size] = '\0';
(void) d->ref.deref(); // cannot be 0, x points to shared_null
d = x;
} else {
if (d->ref != 1 || size > d->alloc || (size < d->size && size < d->alloc >> 1))
realloc(qAllocMore(size, sizeof(Data)));
if (d->alloc >= size) {
d->size = size;
if (d->data == d->array) {
d->array[size] = '\0';
}
}
}
}
/*!
Sets every byte in the byte array to character \a ch. If \a size
is different from -1 (the default), the byte array is resized to
size \a size beforehand.
Example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 14
\sa resize()
*/
QByteArray &QByteArray::fill(char ch, int size)
{
resize(size < 0 ? d->size : size);
if (d->size)
memset(d->data, ch, d->size);
return *this;
}
void QByteArray::realloc(int alloc)
{
if (d->ref != 1 || d->data != d->array) {
Data *x = static_cast<Data *>(qMalloc(sizeof(Data) + alloc));
Q_CHECK_PTR(x);
x->size = qMin(alloc, d->size);
::memcpy(x->array, d->data, x->size);
x->array[x->size] = '\0';
x->ref = 1;
x->alloc = alloc;
x->data = x->array;
if (!d->ref.deref())
qFree(d);
d = x;
} else {
Data *x = static_cast<Data *>(qRealloc(d, sizeof(Data) + alloc));
Q_CHECK_PTR(x);
x->alloc = alloc;
x->data = x->array;
d = x;
}
}
void QByteArray::expand(int i)
{
resize(qMax(i + 1, d->size));
}
/*!
\internal
Return a QByteArray that is sure to be NUL-terminated.
By default, all QByteArray have an extra NUL at the end,
guaranteeing that assumption. However, if QByteArray::fromRawData
is used, then the NUL is there only if the user put it there. We
can't be sure.
*/
QByteArray QByteArray::nulTerminated() const
{
// is this fromRawData?
if (d->data == d->array)
return *this; // no, then we're sure we're zero terminated
QByteArray copy(*this);
copy.detach();
return copy;
}
/*!
Prepends the byte array \a ba to this byte array and returns a
reference to this byte array.
Example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 15
This is the same as insert(0, \a ba).
Note: QByteArray is an \l{implicitly shared} class. Consequently,
if \e this is an empty QByteArray, then \e this will just share
the data held in \a ba. In this case, no copying of data is done,
taking \l{constant time}. If a shared instance is modified, it will
be copied (copy-on-write), taking \l{linear time}.
If \e this is not an empty QByteArray, a deep copy of the data is
performed, taking \l{linear time}.
\sa append(), insert()
*/
QByteArray &QByteArray::prepend(const QByteArray &ba)
{
if ((d == &shared_null || d == &shared_empty) && !IS_RAW_DATA(ba.d)) {
*this = ba;
} else if (ba.d != &shared_null) {
QByteArray tmp = *this;
*this = ba;
append(tmp);
}
return *this;
}
/*!
\overload
Prepends the string \a str to this byte array.
*/
QByteArray &QByteArray::prepend(const char *str)
{
return prepend(str, qstrlen(str));
}
/*!
\overload
\since 4.6
Prepends \a len bytes of the string \a str to this byte array.
*/
QByteArray &QByteArray::prepend(const char *str, int len)
{
if (str) {
if (d->ref != 1 || d->size + len > d->alloc)
realloc(qAllocMore(d->size + len, sizeof(Data)));
memmove(d->data+len, d->data, d->size);
memcpy(d->data, str, len);
d->size += len;
d->data[d->size] = '\0';
}
return *this;
}
/*!
\overload
Prepends the character \a ch to this byte array.
*/
QByteArray &QByteArray::prepend(char ch)
{
if (d->ref != 1 || d->size + 1 > d->alloc)
realloc(qAllocMore(d->size + 1, sizeof(Data)));
memmove(d->data+1, d->data, d->size);
d->data[0] = ch;
++d->size;
d->data[d->size] = '\0';
return *this;
}
/*!
Appends the byte array \a ba onto the end of this byte array.
Example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 16
This is the same as insert(size(), \a ba).
Note: QByteArray is an \l{implicitly shared} class. Consequently,
if \e this is an empty QByteArray, then \e this will just share
the data held in \a ba. In this case, no copying of data is done,
taking \l{constant time}. If a shared instance is modified, it will
be copied (copy-on-write), taking \l{linear time}.
If \e this is not an empty QByteArray, a deep copy of the data is
performed, taking \l{linear time}.
This operation typically does not suffer from allocation overhead,
because QByteArray preallocates extra space at the end of the data
so that it may grow without reallocating for each append operation.
\sa operator+=(), prepend(), insert()
*/
QByteArray &QByteArray::append(const QByteArray &ba)
{
if ((d == &shared_null || d == &shared_empty) && !IS_RAW_DATA(ba.d)) {
*this = ba;
} else if (ba.d != &shared_null) {
if (d->ref != 1 || d->size + ba.d->size > d->alloc)
realloc(qAllocMore(d->size + ba.d->size, sizeof(Data)));
memcpy(d->data + d->size, ba.d->data, ba.d->size);
d->size += ba.d->size;
d->data[d->size] = '\0';
}
return *this;
}
/*! \fn QByteArray &QByteArray::append(const QString &str)
\overload
Appends the string \a str to this byte array. The Unicode data is
converted into 8-bit characters using QString::toAscii().
If the QString contains non-ASCII Unicode characters, using this
function can lead to loss of information. You can disable this
function by defining \c QT_NO_CAST_TO_ASCII when you compile your
applications. You then need to call QString::toAscii() (or
QString::toLatin1() or QString::toUtf8() or QString::toLocal8Bit())
explicitly if you want to convert the data to \c{const char *}.
*/
/*!
\overload
Appends the string \a str to this byte array.
*/
QByteArray& QByteArray::append(const char *str)
{
if (str) {
int len = qstrlen(str);
if (d->ref != 1 || d->size + len > d->alloc)
realloc(qAllocMore(d->size + len, sizeof(Data)));
memcpy(d->data + d->size, str, len + 1); // include null terminator
d->size += len;
}
return *this;
}
/*!
\overload append()
Appends the first \a len characters of the string \a str to this byte
array and returns a reference to this byte array.
If \a len is negative, the length of the string will be determined
automatically using qstrlen(). If \a len is zero or \a str is
null, nothing is appended to the byte array. Ensure that \a len is
\e not longer than \a str.
*/
QByteArray &QByteArray::append(const char *str, int len)
{
if (len < 0)
len = qstrlen(str);
if (str && len) {
if (d->ref != 1 || d->size + len > d->alloc)
realloc(qAllocMore(d->size + len, sizeof(Data)));
memcpy(d->data + d->size, str, len); // include null terminator
d->size += len;
d->data[d->size] = '\0';
}
return *this;
}
/*!
\overload
Appends the character \a ch to this byte array.
*/
QByteArray& QByteArray::append(char ch)
{
if (d->ref != 1 || d->size + 1 > d->alloc)
realloc(qAllocMore(d->size + 1, sizeof(Data)));
d->data[d->size++] = ch;
d->data[d->size] = '\0';
return *this;
}
/*!
\internal
Inserts \a len bytes from the array \a arr at position \a pos and returns a
reference the modified byte array.
*/
static inline QByteArray &qbytearray_insert(QByteArray *ba,
int pos, const char *arr, int len)
{
Q_ASSERT(pos >= 0);
if (pos < 0 || len <= 0 || arr == 0)
return *ba;
int oldsize = ba->size();
ba->resize(qMax(pos, oldsize) + len);
char *dst = ba->data();
if (pos > oldsize)
::memset(dst + oldsize, 0x20, pos - oldsize);
else
::memmove(dst + pos + len, dst + pos, oldsize - pos);
memcpy(dst + pos, arr, len);
return *ba;
}
/*!
Inserts the byte array \a ba at index position \a i and returns a
reference to this byte array.
Example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 17
\sa append(), prepend(), replace(), remove()
*/
QByteArray &QByteArray::insert(int i, const QByteArray &ba)
{
QByteArray copy(ba);
return qbytearray_insert(this, i, copy.d->data, copy.d->size);
}
/*!
\fn QByteArray &QByteArray::insert(int i, const QString &str)
\overload
Inserts the string \a str at index position \a i in the byte
array. The Unicode data is converted into 8-bit characters using
QString::toAscii().
If \a i is greater than size(), the array is first extended using
resize().
If the QString contains non-ASCII Unicode characters, using this
function can lead to loss of information. You can disable this
function by defining \c QT_NO_CAST_TO_ASCII when you compile your
applications. You then need to call QString::toAscii() (or
QString::toLatin1() or QString::toUtf8() or QString::toLocal8Bit())
explicitly if you want to convert the data to \c{const char *}.
*/
/*!
\overload
Inserts the string \a str at position \a i in the byte array.
If \a i is greater than size(), the array is first extended using
resize().
*/
QByteArray &QByteArray::insert(int i, const char *str)
{
return qbytearray_insert(this, i, str, qstrlen(str));
}
/*!
\overload
\since 4.6
Inserts \a len bytes of the string \a str at position
\a i in the byte array.
If \a i is greater than size(), the array is first extended using
resize().
*/
QByteArray &QByteArray::insert(int i, const char *str, int len)
{
return qbytearray_insert(this, i, str, len);
}
/*!
\overload
Inserts character \a ch at index position \a i in the byte array.
If \a i is greater than size(), the array is first extended using
resize().
*/
QByteArray &QByteArray::insert(int i, char ch)
{
return qbytearray_insert(this, i, &ch, 1);
}
/*!
Removes \a len bytes from the array, starting at index position \a
pos, and returns a reference to the array.
If \a pos is out of range, nothing happens. If \a pos is valid,
but \a pos + \a len is larger than the size of the array, the
array is truncated at position \a pos.
Example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 18
\sa insert(), replace()
*/
QByteArray &QByteArray::remove(int pos, int len)
{
if (len <= 0 || pos >= d->size || pos < 0)
return *this;
detach();
if (pos + len >= d->size) {
resize(pos);
} else {
memmove(d->data + pos, d->data + pos + len, d->size - pos - len);
resize(d->size - len);
}
return *this;
}
/*!
Replaces \a len bytes from index position \a pos with the byte
array \a after, and returns a reference to this byte array.
Example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 19
\sa insert(), remove()
*/
QByteArray &QByteArray::replace(int pos, int len, const QByteArray &after)
{
if (len == after.d->size && (pos + len <= d->size)) {
detach();
memmove(d->data + pos, after.d->data, len*sizeof(char));
return *this;
} else {
QByteArray copy(after);
// ### optimize me
remove(pos, len);
return insert(pos, copy);
}
}
/*! \fn QByteArray &QByteArray::replace(int pos, int len, const char *after)
\overload
Replaces \a len bytes from index position \a pos with the zero terminated
string \a after.
Notice: this can change the length of the byte array.
*/
QByteArray &QByteArray::replace(int pos, int len, const char *after)
{
return replace(pos,len,after,qstrlen(after));
}
/*! \fn QByteArray &QByteArray::replace(int pos, int len, const char *after, int alen)
\overload
Replaces \a len bytes from index position \a pos with \a alen bytes
from the string \a after. \a after is allowed to have '\0' characters.
\since 4.7
*/
QByteArray &QByteArray::replace(int pos, int len, const char *after, int alen)
{
if (len == alen && (pos + len <= d->size)) {
detach();
memcpy(d->data + pos, after, len*sizeof(char));
return *this;
} else {
remove(pos, len);
return qbytearray_insert(this, pos, after, alen);
}
}
// ### optimize all other replace method, by offering
// QByteArray::replace(const char *before, int blen, const char *after, int alen)
/*!
\overload
Replaces every occurrence of the byte array \a before with the
byte array \a after.
Example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 20
*/
QByteArray &QByteArray::replace(const QByteArray &before, const QByteArray &after)
{
if (isNull() || before.d == after.d)
return *this;
QByteArray aft = after;
if (after.d == d)
aft.detach();
return replace(before.constData(), before.size(), aft.constData(), aft.size());
}
/*!
\fn QByteArray &QByteArray::replace(const char *before, const QByteArray &after)
\overload
Replaces every occurrence of the string \a before with the
byte array \a after.
*/
QByteArray &QByteArray::replace(const char *c, const QByteArray &after)
{
QByteArray aft = after;
if (after.d == d)
aft.detach();
return replace(c, qstrlen(c), aft.constData(), aft.size());
}
/*!
\fn QByteArray &QByteArray::replace(const char *before, int bsize, const char *after, int asize)
\overload
Replaces every occurrence of the string \a before with the string \a after.
Since the sizes of the strings are given by \a bsize and \a asize, they
may contain zero characters and do not need to be zero-terminated.
*/
QByteArray &QByteArray::replace(const char *before, int bsize, const char *after, int asize)
{
if (isNull() || (before == after && bsize == asize))
return *this;
// protect against before or after being part of this
const char *a = after;
const char *b = before;
if (after >= d->data && after < d->data + d->size) {
char *copy = (char *)malloc(asize);
Q_CHECK_PTR(copy);
memcpy(copy, after, asize);
a = copy;
}
if (before >= d->data && before < d->data + d->size) {
char *copy = (char *)malloc(bsize);
Q_CHECK_PTR(copy);
memcpy(copy, before, bsize);
b = copy;
}
QByteArrayMatcher matcher(before, bsize);
int index = 0;
int len = d->size;
char *d = data();
if (bsize == asize) {
if (bsize) {
while ((index = matcher.indexIn(*this, index)) != -1) {
memcpy(d + index, after, asize);
index += bsize;
}
}
} else if (asize < bsize) {
uint to = 0;
uint movestart = 0;
uint num = 0;
while ((index = matcher.indexIn(*this, index)) != -1) {
if (num) {
int msize = index - movestart;
if (msize > 0) {
memmove(d + to, d + movestart, msize);
to += msize;
}
} else {
to = index;
}
if (asize) {
memcpy(d + to, after, asize);
to += asize;
}
index += bsize;
movestart = index;
num++;
}
if (num) {
int msize = len - movestart;
if (msize > 0)
memmove(d + to, d + movestart, msize);
resize(len - num*(bsize-asize));
}
} else {
// the most complex case. We don't want to lose performance by doing repeated
// copies and reallocs of the string.
while (index != -1) {
uint indices[4096];
uint pos = 0;
while(pos < 4095) {
index = matcher.indexIn(*this, index);
if (index == -1)
break;
indices[pos++] = index;
index += bsize;
// avoid infinite loop
if (!bsize)
index++;
}
if (!pos)
break;
// we have a table of replacement positions, use them for fast replacing
int adjust = pos*(asize-bsize);
// index has to be adjusted in case we get back into the loop above.
if (index != -1)
index += adjust;
int newlen = len + adjust;
int moveend = len;
if (newlen > len) {
resize(newlen);
len = newlen;
}
d = this->d->data;
while(pos) {
pos--;
int movestart = indices[pos] + bsize;
int insertstart = indices[pos] + pos*(asize-bsize);
int moveto = insertstart + asize;
memmove(d + moveto, d + movestart, (moveend - movestart));
if (asize)
memcpy(d + insertstart, after, asize);
moveend = movestart - bsize;
}
}
}
if (a != after)
::free((char *)a);
if (b != before)
::free((char *)b);
return *this;
}
/*!
\fn QByteArray &QByteArray::replace(const QByteArray &before, const char *after)
\overload
Replaces every occurrence of the byte array \a before with the
string \a after.
*/
/*! \fn QByteArray &QByteArray::replace(const QString &before, const QByteArray &after)
\overload
Replaces every occurrence of the string \a before with the byte
array \a after. The Unicode data is converted into 8-bit
characters using QString::toAscii().
If the QString contains non-ASCII Unicode characters, using this
function can lead to loss of information. You can disable this
function by defining \c QT_NO_CAST_TO_ASCII when you compile your
applications. You then need to call QString::toAscii() (or
QString::toLatin1() or QString::toUtf8() or QString::toLocal8Bit())
explicitly if you want to convert the data to \c{const char *}.
*/
/*! \fn QByteArray &QByteArray::replace(const QString &before, const char *after)
\overload
Replaces every occurrence of the string \a before with the string
\a after.
*/
/*! \fn QByteArray &QByteArray::replace(const char *before, const char *after)
\overload
Replaces every occurrence of the string \a before with the string
\a after.
*/
/*!
\overload
Replaces every occurrence of the character \a before with the
byte array \a after.
*/
QByteArray &QByteArray::replace(char before, const QByteArray &after)
{
char b[2] = { before, '\0' };
QByteArray cb = fromRawData(b, 1);
return replace(cb, after);
}
/*! \fn QByteArray &QByteArray::replace(char before, const QString &after)
\overload
Replaces every occurrence of the character \a before with the
string \a after. The Unicode data is converted into 8-bit
characters using QString::toAscii().
If the QString contains non-ASCII Unicode characters, using this
function can lead to loss of information. You can disable this
function by defining \c QT_NO_CAST_TO_ASCII when you compile your
applications. You then need to call QString::toAscii() (or
QString::toLatin1() or QString::toUtf8() or QString::toLocal8Bit())
explicitly if you want to convert the data to \c{const char *}.
*/
/*! \fn QByteArray &QByteArray::replace(char before, const char *after)
\overload
Replaces every occurrence of the character \a before with the
string \a after.
*/
/*!
\overload
Replaces every occurrence of the character \a before with the
character \a after.
*/
QByteArray &QByteArray::replace(char before, char after)
{
if (d->size) {
char *i = data();
char *e = i + d->size;
for (; i != e; ++i)
if (*i == before)
* i = after;
}
return *this;
}
/*!
Splits the byte array into subarrays wherever \a sep occurs, and
returns the list of those arrays. If \a sep does not match
anywhere in the byte array, split() returns a single-element list
containing this byte array.
*/
QList<QByteArray> QByteArray::split(char sep) const
{
QList<QByteArray> list;
int start = 0;
int end;
while ((end = indexOf(sep, start)) != -1) {
list.append(mid(start, end - start));
start = end + 1;
}
list.append(mid(start));
return list;
}
/*!
\since 4.5
Returns a copy of this byte array repeated the specified number of \a times.
If \a times is less than 1, an empty byte array is returned.
Example:
\code
QByteArray ba("ab");
ba.repeated(4); // returns "abababab"
\endcode
*/
QByteArray QByteArray::repeated(int times) const
{
if (d->size == 0)
return *this;
if (times <= 1) {
if (times == 1)
return *this;
return QByteArray();
}
const int resultSize = times * d->size;
QByteArray result;
result.reserve(resultSize);
if (result.d->alloc != resultSize)
return QByteArray(); // not enough memory
memcpy(result.d->data, d->data, d->size);
int sizeSoFar = d->size;
char *end = result.d->data + sizeSoFar;
const int halfResultSize = resultSize >> 1;
while (sizeSoFar <= halfResultSize) {
memcpy(end, result.d->data, sizeSoFar);
end += sizeSoFar;
sizeSoFar <<= 1;
}
memcpy(end, result.d->data, resultSize - sizeSoFar);
result.d->data[resultSize] = '\0';
result.d->size = resultSize;
return result;
}
#define REHASH(a) \
if (ol_minus_1 < sizeof(uint) * CHAR_BIT) \
hashHaystack -= (a) << ol_minus_1; \
hashHaystack <<= 1
/*!
Returns the index position of the first occurrence of the byte
array \a ba in this byte array, searching forward from index
position \a from. Returns -1 if \a ba could not be found.
Example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 21
\sa lastIndexOf(), contains(), count()
*/
int QByteArray::indexOf(const QByteArray &ba, int from) const
{
const int ol = ba.d->size;
if (ol == 0)
return from;
if (ol == 1)
return indexOf(*ba.d->data, from);
const int l = d->size;
if (from > d->size || ol + from > l)
return -1;
return qFindByteArray(d->data, d->size, from, ba.d->data, ol);
}
/*! \fn int QByteArray::indexOf(const QString &str, int from) const
\overload
Returns the index position of the first occurrence of the string
\a str in the byte array, searching forward from index position
\a from. Returns -1 if \a str could not be found.
The Unicode data is converted into 8-bit characters using
QString::toAscii().
If the QString contains non-ASCII Unicode characters, using this
function can lead to loss of information. You can disable this
function by defining \c QT_NO_CAST_TO_ASCII when you compile your
applications. You then need to call QString::toAscii() (or
QString::toLatin1() or QString::toUtf8() or QString::toLocal8Bit())
explicitly if you want to convert the data to \c{const char *}.
*/
/*! \fn int QByteArray::indexOf(const char *str, int from) const
\overload
Returns the index position of the first occurrence of the string
\a str in the byte array, searching forward from index position \a
from. Returns -1 if \a str could not be found.
*/
int QByteArray::indexOf(const char *c, int from) const
{
const int ol = qstrlen(c);
if (ol == 1)
return indexOf(*c, from);
const int l = d->size;
if (from > d->size || ol + from > l)
return -1;
if (ol == 0)
return from;
return qFindByteArray(d->data, d->size, from, c, ol);
}
/*!
\overload
Returns the index position of the first occurrence of the
character \a ch in the byte array, searching forward from index
position \a from. Returns -1 if \a ch could not be found.
Example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 22
\sa lastIndexOf(), contains()
*/
int QByteArray::indexOf(char ch, int from) const
{
if (from < 0)
from = qMax(from + d->size, 0);
if (from < d->size) {
const char *n = d->data + from - 1;
const char *e = d->data + d->size;
while (++n != e)
if (*n == ch)
return n - d->data;
}
return -1;
}
static int lastIndexOfHelper(const char *haystack, int l, const char *needle, int ol, int from)
{
int delta = l - ol;
if (from < 0)
from = delta;
if (from < 0 || from > l)
return -1;
if (from > delta)
from = delta;
const char *end = haystack;
haystack += from;
const uint ol_minus_1 = ol - 1;
const char *n = needle + ol_minus_1;
const char *h = haystack + ol_minus_1;
uint hashNeedle = 0, hashHaystack = 0;
int idx;
for (idx = 0; idx < ol; ++idx) {
hashNeedle = ((hashNeedle<<1) + *(n-idx));
hashHaystack = ((hashHaystack<<1) + *(h-idx));
}
hashHaystack -= *haystack;
while (haystack >= end) {
hashHaystack += *haystack;
if (hashHaystack == hashNeedle && memcmp(needle, haystack, ol) == 0)
return haystack - end;
--haystack;
REHASH(*(haystack + ol));
}
return -1;
}
/*!
\fn int QByteArray::lastIndexOf(const QByteArray &ba, int from) const
Returns the index position of the last occurrence of the byte
array \a ba in this byte array, searching backward from index
position \a from. If \a from is -1 (the default), the search
starts at the last byte. Returns -1 if \a ba could not be found.
Example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 23
\sa indexOf(), contains(), count()
*/
int QByteArray::lastIndexOf(const QByteArray &ba, int from) const
{
const int ol = ba.d->size;
if (ol == 1)
return lastIndexOf(*ba.d->data, from);
return lastIndexOfHelper(d->data, d->size, ba.d->data, ol, from);
}
/*! \fn int QByteArray::lastIndexOf(const QString &str, int from) const
\overload
Returns the index position of the last occurrence of the string \a
str in the byte array, searching backward from index position \a
from. If \a from is -1 (the default), the search starts at the
last (size() - 1) byte. Returns -1 if \a str could not be found.
The Unicode data is converted into 8-bit characters using
QString::toAscii().
If the QString contains non-ASCII Unicode characters, using this
function can lead to loss of information. You can disable this
function by defining \c QT_NO_CAST_TO_ASCII when you compile your
applications. You then need to call QString::toAscii() (or
QString::toLatin1() or QString::toUtf8() or QString::toLocal8Bit())
explicitly if you want to convert the data to \c{const char *}.
*/
/*! \fn int QByteArray::lastIndexOf(const char *str, int from) const
\overload
Returns the index position of the last occurrence of the string \a
str in the byte array, searching backward from index position \a
from. If \a from is -1 (the default), the search starts at the
last (size() - 1) byte. Returns -1 if \a str could not be found.
*/
int QByteArray::lastIndexOf(const char *str, int from) const
{
const int ol = qstrlen(str);
if (ol == 1)
return lastIndexOf(*str, from);
return lastIndexOfHelper(d->data, d->size, str, ol, from);
}
/*!
\overload
Returns the index position of the last occurrence of character \a
ch in the byte array, searching backward from index position \a
from. If \a from is -1 (the default), the search starts at the
last (size() - 1) byte. Returns -1 if \a ch could not be found.
Example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 24
\sa indexOf(), contains()
*/
int QByteArray::lastIndexOf(char ch, int from) const
{
if (from < 0)
from += d->size;
else if (from > d->size)
from = d->size-1;
if (from >= 0) {
const char *b = d->data;
const char *n = d->data + from + 1;
while (n-- != b)
if (*n == ch)
return n - b;
}
return -1;
}
/*!
Returns the number of (potentially overlapping) occurrences of
byte array \a ba in this byte array.
\sa contains(), indexOf()
*/
int QByteArray::count(const QByteArray &ba) const
{
int num = 0;
int i = -1;
if (d->size > 500 && ba.d->size > 5) {
QByteArrayMatcher matcher(ba);
while ((i = matcher.indexIn(*this, i + 1)) != -1)
++num;
} else {
while ((i = indexOf(ba, i + 1)) != -1)
++num;
}
return num;
}
/*!
\overload
Returns the number of (potentially overlapping) occurrences of
string \a str in the byte array.
*/
int QByteArray::count(const char *str) const
{
return count(fromRawData(str, qstrlen(str)));
}
/*!
\overload
Returns the number of occurrences of character \a ch in the byte
array.
\sa contains(), indexOf()
*/
int QByteArray::count(char ch) const
{
int num = 0;
const char *i = d->data + d->size;
const char *b = d->data;
while (i != b)
if (*--i == ch)
++num;
return num;
}
/*! \fn int QByteArray::count() const
\overload
Same as size().
*/
/*!
Returns true if this byte array starts with byte array \a ba;
otherwise returns false.
Example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 25
\sa endsWith(), left()
*/
bool QByteArray::startsWith(const QByteArray &ba) const
{
if (d == ba.d || ba.d->size == 0)
return true;
if (d->size < ba.d->size)
return false;
return memcmp(d->data, ba.d->data, ba.d->size) == 0;
}
/*! \overload
Returns true if this byte array starts with string \a str;
otherwise returns false.
*/
bool QByteArray::startsWith(const char *str) const
{
if (!str || !*str)
return true;
int len = qstrlen(str);
if (d->size < len)
return false;
return qstrncmp(d->data, str, len) == 0;
}
/*! \overload
Returns true if this byte array starts with character \a ch;
otherwise returns false.
*/
bool QByteArray::startsWith(char ch) const
{
if (d->size == 0)
return false;
return d->data[0] == ch;
}
/*!
Returns true if this byte array ends with byte array \a ba;
otherwise returns false.
Example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 26
\sa startsWith(), right()
*/
bool QByteArray::endsWith(const QByteArray &ba) const
{
if (d == ba.d || ba.d->size == 0)
return true;
if (d->size < ba.d->size)
return false;
return memcmp(d->data + d->size - ba.d->size, ba.d->data, ba.d->size) == 0;
}
/*! \overload
Returns true if this byte array ends with string \a str; otherwise
returns false.
*/
bool QByteArray::endsWith(const char *str) const
{
if (!str || !*str)
return true;
int len = qstrlen(str);
if (d->size < len)
return false;
return qstrncmp(d->data + d->size - len, str, len) == 0;
}
/*! \overload
Returns true if this byte array ends with character \a ch;
otherwise returns false.
*/
bool QByteArray::endsWith(char ch) const
{
if (d->size == 0)
return false;
return d->data[d->size - 1] == ch;
}
/*!
Returns a byte array that contains the leftmost \a len bytes of
this byte array.
The entire byte array is returned if \a len is greater than
size().
Example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 27
\sa right(), mid(), startsWith(), truncate()
*/
QByteArray QByteArray::left(int len) const
{
if (len >= d->size)
return *this;
if (len < 0)
len = 0;
return QByteArray(d->data, len);
}
/*!
Returns a byte array that contains the rightmost \a len bytes of
this byte array.
The entire byte array is returned if \a len is greater than
size().
Example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 28
\sa endsWith(), left(), mid()
*/
QByteArray QByteArray::right(int len) const
{
if (len >= d->size)
return *this;
if (len < 0)
len = 0;
return QByteArray(d->data + d->size - len, len);
}
/*!
Returns a byte array containing \a len bytes from this byte array,
starting at position \a pos.
If \a len is -1 (the default), or \a pos + \a len >= size(),
returns a byte array containing all bytes starting at position \a
pos until the end of the byte array.
Example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 29
\sa left(), right()
*/
QByteArray QByteArray::mid(int pos, int len) const
{
if (d == &shared_null || d == &shared_empty || pos >= d->size)
return QByteArray();
if (len < 0)
len = d->size - pos;
if (pos < 0) {
len += pos;
pos = 0;
}
if (len + pos > d->size)
len = d->size - pos;
if (pos == 0 && len == d->size)
return *this;
return QByteArray(d->data + pos, len);
}
/*!
Returns a lowercase copy of the byte array. The bytearray is
interpreted as a Latin-1 encoded string.
Example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 30
\sa toUpper(), {8-bit Character Comparisons}
*/
QByteArray QByteArray::toLower() const
{
QByteArray s(*this);
register uchar *p = reinterpret_cast<uchar *>(s.data());
if (p) {
while (*p) {
*p = QChar::toLower((ushort)*p);
p++;
}
}
return s;
}
/*!
Returns an uppercase copy of the byte array. The bytearray is
interpreted as a Latin-1 encoded string.
Example:
\snippet doc/src/snippets/code/src_corelib_tools_qbytearray.cpp 31
\sa toLower(), {8-bit Character Comparisons}
*/
QByteArray QByteArray::toUpper() const
{
QByteArray s(*this);
register uchar *p = reinterpret_cast<uchar *>(s.data());
if (p) {
while (*p) {
*p = QChar::toUpper((ushort)*p);
p++;
}
}
return s;
}
/*! \fn void QByteArray::clear()
Clears the contents of the byte array and makes it empty.
\sa resize(), isEmpty()
*/
void QByteArray::clear()
{
if (!d->ref.deref())
qFree(d);
d = &shared_null;
d->ref.ref();
}
#if !defined(QT_NO_DATASTREAM) || (defined(QT_BOOTSTRAPPED) && !defined(QT_BUILD_QMAKE))
/*! \relates QByteArray
Writes byte array \a ba to the stream \a out and returns a reference
to the stream.
\sa {Serializing Qt Data Types}
*/
QDataStream &operator<<(QDataStream &out, const QByteArray &ba)
{
if (ba.isNull() && out.version() >= 6) {
out << (quint32)0xffffffff;
return out;
}
return out.writeBytes(ba, ba.size());
}
/*! \relates QByteArray
Reads a byte array into \a ba from the stream \a in and returns a
reference to the stream.
\sa {Serializing Qt Data Types}
*/
QDataStream &operator>>(QDataStream &in, QByteArray &ba)
{
ba.clear();
quint32 len;
in >> len;
if (len == 0xffffffff)
return in;
const quint32 Step = 1024 * 1024;
quint32 allocated = 0;
do {
int blockSize = qMin(Step, len - allocated);
ba.resize(allocated + blockSize);
if (in.readRawData(ba.data() + allocated, blockSize) != blockSize) {
ba.clear();
in.setStatus(QDataStream::ReadPastEnd);
return in;
}
allocated += blockSize;
} while (allocated < len);
return in;
}
#endif // QT_NO_DATASTREAM
/*! \fn bool QByteArray::operator==(const QString &str) const
Returns true if this byte array is equal to string \a str;
otherwise returns false.
The Unicode data is converted into 8-bit characters using
QString::toAscii().
The comparison is case sensitive.
You can disable this operator by defining \c
QT_NO_CAST_FROM_ASCII when you compile your applications. You
then need to call QString::fromAscii(), QString::fromLatin1(),
QString::fromUtf8(), or QString::fromLocal8Bit() explicitly if
you want to convert the byte array to a QString before doing the
comparison.
*/
/*! \fn bool QByteArray::operator!=(const QString &str) const
Returns true if this byte array is not equal to string \a str;
otherwise returns false.
The Unicode data is converted into 8-bit characters using
QString::toAscii().
The comparison is case sensitive.
You can disable this operator by defining \c
QT_NO_CAST_FROM_ASCII when you compile your applications. You
then need to call QString::fromAscii(), QString::fromLatin1(),
QString::fromUtf8(), or QString::fromLocal8Bit() explicitly if
you want to convert the byte array to a QString before doing the
comparison.
*/
/*! \fn bool QByteArray::operator<(const QString &str) const
Returns true if this byte array is lexically less than string \a
str; otherwise returns false.
The Unicode data is converted into 8-bit characters using
QString::toAscii().
The comparison is case sensitive.
You can disable this operator by defining \c
QT_NO_CAST_FROM_ASCII when you compile your applications. You
then need to call QString::fromAscii(), QString::fromLatin1(),
QString::fromUtf8(), or QString::fromLocal8Bit() explicitly if
you want to convert the byte array to a QString before doing the
comparison.
*/
/*! \fn bool QByteArray::operator>(const QString &str) const
Returns true if this byte array is lexically greater than string
\a str; otherwise returns false.
The Unicode data is converted into 8-bit characters using
QString::toAscii().
The comparison is case sensitive.
You can disable this operator by defining \c
QT_NO_CAST_FROM_ASCII when you compile your applications. You
then need to call QString::fromAscii(), QString::fromLatin1(),
QString::fromUtf8(), or QString::fromLocal8Bit() explicitly if
you want to convert the byte array to a QString before doing the
comparison.
*/
/*! \fn bool QByteArray::operator<=(const QString &str) const
Returns true if this byte array is lexically less than or equal
to string \a str; otherwise returns false.
The Unicode data is converted into 8-bit characters using
QString::toAscii().
The comparison is case sensitive.
You can disable this operator by defining \c
QT_NO_CAST_FROM_ASCII when you compile your applications. You
then need to call QString::fromAscii(), QString::fromLatin1(),
QString::fromUtf8(), or QString::fromLocal8Bit() explicitly if
you want to convert the byte array to a QString before doing the
comparison.
*/
/*! \fn bool QByteArray::operator>=(const QString &str) const
Returns true if this byte array is greater than or equal to string
\a str; otherwise returns false.
The Unicode data is converted into 8-bit characters using
QString::toAscii().
The comparison is case sensitive.
You can disable this operator by defining \c
QT_NO_CAST_FROM_ASCII when you compile your applications. You
then need to call QString::fromAscii(), QString::fromLatin1(),
QString::fromUtf8(), or QString::fromLocal8Bit() explicitly if
you want to convert the byte array to a QString before doing the
comparison.
*/
/*! \fn bool operator==(const QByteArray &a1, const QByteArray &a2)
\relates QByteArray
\overload
Returns true if byte array \a a1 is equal to byte array \a a2;
otherwise returns false.
*/
/*! \fn bool operator==(const QByteArray &a1, const char *a2)
\relates QByteArray
\overload
Returns true if byte array \a a1 is equal to string \a a2;
otherwise returns false.
*/
/*! \fn bool operator==(const char *a1, const QByteArray &a2)
\relates QByteArray
\overload
Returns true if string \a a1 is equal to byte array \a a2;
otherwise returns false.
*/
/*! \fn bool operator!=(const QByteArray &a1, const QByteArray &a2)
\relates QByteArray
\overload
Returns true if byte array \a a1 is not equal to byte array \a a2;
otherwise returns false.
*/
/*! \fn bool operator!=(const QByteArray &a1, const char *a2)
\relates QByteArray
\overload
Returns true if byte array \a a1 is not equal to string \a a2;
otherwise returns false.
*/
/*! \fn bool operator!=(const char *a1, const QByteArray &a2)
\relates QByteArray
\overload
Returns true if string \a a1 is not equal to byte array \a a2;
otherwise returns false.
*/
/*! \fn bool operator<(const QByteArray &a1, const QByteArray &a2)
\relates QByteArray
\overload
Returns true if byte array \a a1 is lexically less than byte array
\a a2; otherwise returns false.
*/
/*! \fn inline bool operator<(const QByteArray &a1, const char *a2)
\relates QByteArray
\overload
Returns true if byte array \a a1 is lexically less than string
\a a2; otherwise returns false.