pegasus/src/Pegasus/Common/String.cpp - diff

Return to String.cpp CVS log

Up to [Pegasus] / pegasus / src / Pegasus / Common

Diff for /pegasus/src/Pegasus/Common/String.cpp between version 1.6 and 1.124

version 1.6, 2001/04/09 20:18:47

version 1.124, 2007/01/02 19:41:23

Line 1

//BEGIN_LICENSE

//%2006////////////////////////////////////////////////////////////////////////

// Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems.

// IBM Corp.; EMC Corporation, The Open Group.

// IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group.

// EMC Corporation; VERITAS Software Corporation; The Open Group.

// EMC Corporation; Symantec Corporation; The Open Group.

// Permission is hereby granted, free of charge, to any person obtaining a

// Permission is hereby granted, free of charge, to any person obtaining a copy

// copy of this software and associated documentation files (the "Software"),

// of this software and associated documentation files (the "Software"), to

// to deal in the Software without restriction, including without limitation

// deal in the Software without restriction, including without limitation the

// the rights to use, copy, modify, merge, publish, distribute, sublicense,

// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or

// and/or sell copies of the Software, and to permit persons to whom the

// sell copies of the Software, and to permit persons to whom the Software is

// Software is furnished to do so, subject to the following conditions:

// furnished to do so, subject to the following conditions:

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

// THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN

// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

// ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED

// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

// "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT

// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

// LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR

// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT

// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER

// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN

// DEALINGS IN THE SOFTWARE.

// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION

// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

//END_LICENSE

//==============================================================================

//BEGIN_HISTORY

// Author:

//%/////////////////////////////////////////////////////////////////////////////

// $Log$

#include <Pegasus/Common/PegasusAssert.h>

// Revision 1.6 2001/04/09 20:18:47 karl

#include <cstring>

// add find substring function

#include "InternalException.h"

#include "CommonUTF.h"

// Revision 1.5 2001/03/09 19:49:32 karl

#include "MessageLoader.h"

// long lines

#include "StringRep.h"

// Revision 1.4 2001/02/26 04:33:28 mike

#ifdef PEGASUS_HAS_ICU

// Fixed many places where cim names compared with operator==(String,String).

#include <unicode/ustring.h>

// Changed all of these to use CIMName::equal()

#include <unicode/uchar.h>

#endif

PEGASUS_NAMESPACE_BEGIN

//==============================================================================

// Revision 1.3 2001/02/11 17:19:30 mike

// Compile-time macros (undefined by default).

// added reverseFind() method

// Revision 1.2 2001/02/11 05:42:33 mike

// PEGASUS_STRING_NO_UTF8 -- don't generate slower UTF8 code.

// new

// Revision 1.1.1.1 2001/01/14 19:53:14 mike

//==============================================================================

// Pegasus import

//==============================================================================

// File-scope definitions:

//END_HISTORY

//==============================================================================

// Note: this table is much faster than the system toupper(). Please do not

// change.

#include <cctype>

const Uint8 _toUpperTable[256] =

#include "String.h"

{

#include "Exception.h"

0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,

#include "String.h"

0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,

0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,

0x18,0x19,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,

0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,

0x28,0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F,

0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,

0x38,0x39,0x3A,0x3B,0x3C,0x3D,0x3E,0x3F,

0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,

0x48,0x49,0x4A,0x4B,0x4C,0x4D,0x4E,0x4F,

0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,

0x58,0x59,0x5A,0x5B,0x5C,0x5D,0x5E,0x5F,

0x60,0x41,0x42,0x43,0x44,0x45,0x46,0x47,

0x48,0x49,0x4A,0x4B,0x4C,0x4D,0x4E,0x4F,

0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,

0x58,0x59,0x5A,0x7B,0x7C,0x7D,0x7E,0x7F,

0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,

0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,

0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,

0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F,

0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,

0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,

0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,

0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF,

0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,

0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,

0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,

0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF,

0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,

0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,

0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,

0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF,

};

// Note: this table is much faster than the system tulower(). Please do not

// change.

const Uint8 _toLowerTable[256] =

{

0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,

0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,

0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,

0x18,0x19,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,

0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,

0x28,0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F,

0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,

0x38,0x39,0x3A,0x3B,0x3C,0x3D,0x3E,0x3F,

0x40,0x61,0x62,0x63,0x64,0x65,0x66,0x67,

0x68,0x69,0x6A,0x6B,0x6C,0x6D,0x6E,0x6F,

0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,

0x78,0x79,0x7A,0x5B,0x5C,0x5D,0x5E,0x5F,

0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,

0x68,0x69,0x6A,0x6B,0x6C,0x6D,0x6E,0x6F,

0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,

0x78,0x79,0x7A,0x7B,0x7C,0x7D,0x7E,0x7F,

0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,

0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,

0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,

0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F,

0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,

0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,

0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,

0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF,

0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,

0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,

0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,

0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF,

0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,

0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,

0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,

0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF,

};

// Converts 16-bit characters to upper case. This routine is faster than the

// system toupper(). Please do not change.

inline Uint16 _toUpper(Uint16 x)

{

return (x & 0xFF00) ? x : _toUpperTable[x];

}

// Converts 16-bit characters to lower case. This routine is faster than the

// system toupper(). Please do not change.

inline Uint16 _toLower(Uint16 x)

{

return (x & 0xFF00) ? x : _toLowerTable[x];

}

// Rounds x up to the nearest power of two (or just returns 8 if x < 8).

static Uint32 _roundUpToPow2(Uint32 x)

{

// Check for potential overflow in x

PEGASUS_CHECK_CAPACITY_OVERFLOW(x);

if (x < 8)

return 8;

x--;

x |= (x >> 1);

x |= (x >> 2);

x |= (x >> 4);

x |= (x >> 8);

x |= (x >> 16);

x++;

return x;

}

template<class P, class Q>

static void _copy(P* p, const Q* q, size_t n)

{

// The following employs loop unrolling for efficiency. Please do not

// eliminate.

while (n >= 8)

{

p[0] = q[0];

p[1] = q[1];

p[2] = q[2];

p[3] = q[3];

p[4] = q[4];

p[5] = q[5];

p[6] = q[6];

p[7] = q[7];

p += 8;

q += 8;

n -= 8;

}

while (n >= 4)

{

p[0] = q[0];

p[1] = q[1];

p[2] = q[2];

p[3] = q[3];

p += 4;

q += 4;

n -= 4;

}

// For debugging

while (n--)

// #include <iostream>

*p++ = *q++;

//using namespace std;

}

static Uint16* _find(const Uint16* s, size_t n, Uint16 c)

{

// The following employs loop unrolling for efficiency. Please do not

// eliminate.

PEGASUS_NAMESPACE_BEGIN

while (n >= 4)

{

if (s[0] == c)

return (Uint16*)s;

if (s[1] == c)

return (Uint16*)&s[1];

if (s[2] == c)

return (Uint16*)&s[2];

if (s[3] == c)

return (Uint16*)&s[3];

const String String::EMPTY;

n -= 4;

s += 4;

}

inline Uint32 StrLen(const char* str)

if (n)

{

if (!str)

if (*s == c)

throw NullPointer();

return (Uint16*)s;

s++;

n--;

}

return strlen(str);

if (n)

{

if (*s == c)

return (Uint16*)s;

s++;

n--;

}

inline Uint32 StrLen(const Char16* str)

if (n && *s == c)

return (Uint16*)s;

// Not found!

return 0;

}

static int _compare(const Uint16* s1, const Uint16* s2)

{

if (!str)

while (*s1 && *s2)

throw NullPointer();

{

int r = *s1++ - *s2++;

Uint32 n = 0;

if (r)

return r;

}

while (*str++)

if (*s2)

n++;

return -1;

else if (*s1)

return 1;

return n;

return 0;

}

String::String()

static int _compareNoUTF8(const Uint16* s1, const char* s2)

{

_rep.append('\0');

Uint16 c1;

Uint16 c2;

{

c1 = *s1++;

c2 = *s2++;

if (c1 == 0)

return c1 - c2;

}

while (c1 == c2);

String::String(const String& x) : _rep(x._rep)

return c1 - c2;

}

static inline void _copy(Uint16* s1, const Uint16* s2, size_t n)

{

memcpy(s1, s2, n * sizeof(Uint16));

}

void StringThrowOutOfBounds()

{

throw IndexOutOfBoundsException();

}

inline void _checkNullPointer(const void* ptr)

{

if (!ptr)

throw NullPointer();

}

String::String(const String& x, Uint32 n)

static void _StringThrowBadUTF8(Uint32 index)

{

_rep.append('\0');

MessageLoaderParms parms(

append(x.getData(), n);

"Common.String.BAD_UTF8",

"The byte sequence starting at index $0 "

"is not valid UTF-8 encoding.",

index);

throw Exception(parms);

}

String::String(const Char16* x) : _rep(x, StrLen(x) + 1)

static size_t _copyFromUTF8(

Uint16* dest,

const char* src,

size_t n,

size_t& utf8_error_index)

{

Uint16* p = dest;

const Uint8* q = (const Uint8*)src;

// Process leading 7-bit ASCII characters (to avoid UTF8 overhead later).

// Use loop-unrolling.

while (n >=8 && ((q[0]|q[1]|q[2]|q[3]|q[4]|q[5]|q[6]|q[7]) & 0x80) == 0)

{

p[0] = q[0];

p[1] = q[1];

p[2] = q[2];

p[3] = q[3];

p[4] = q[4];

p[5] = q[5];

p[6] = q[6];

p[7] = q[7];

p += 8;

q += 8;

n -= 8;

}

String::String(const Char16* x, Uint32 n)

while (n >=4 && ((q[0]|q[1]|q[2]|q[3]) & 0x80) == 0)

{

assign(x, n);

p[0] = q[0];

p[1] = q[1];

p[2] = q[2];

p[3] = q[3];

p += 4;

q += 4;

n -= 4;

}

String::String(const char* str)

switch (n)

{

case 0:

return p - dest;

case 1:

if (q[0] < 128)

{

p[0] = q[0];

return p + 1 - dest;

}

break;

case 2:

if (((q[0]|q[1]) & 0x80) == 0)

{

Uint32 n = ::strlen(str) + 1;

p[0] = q[0];

reserve(n);

p[1] = q[1];

return p + 2 - dest;

}

break;

case 3:

if (((q[0]|q[1]|q[2]) & 0x80) == 0)

{

p[0] = q[0];

p[1] = q[1];

p[2] = q[2];

return p + 3 - dest;

}

break;

}

while (n--)

// Process remaining characters.

_rep.append(*str++);

while (n)

{

// Optimize for 7-bit ASCII case.

if (*q < 128)

{

*p++ = *q++;

n--;

}

else

{

Uint8 c = UTF_8_COUNT_TRAIL_BYTES(*q) + 1;

String::String(const char* str, Uint32 n_)

if (c > n || !isValid_U8(q, c) ||

UTF8toUTF16(&q, q + c, &p, p + n) != 0)

{

Uint32 n = _min(strlen(str), n_);

utf8_error_index = q - (const Uint8*)src;

reserve(n + 1);

return size_t(-1);

}

while (n--)

n -= c;

_rep.append(*str++);

}

_rep.append('\0');

return p - dest;

}

String& String::assign(const Char16* x)

// Note: dest must be at least three times src (plus an extra byte for

// terminator).

static inline size_t _copyToUTF8(char* dest, const Uint16* src, size_t n)

{

_rep.clear();

// The following employs loop unrolling for efficiency. Please do not

_rep.append(x, StrLen(x) + 1);

// eliminate.

return *this;

const Uint16* q = src;

Uint8* p = (Uint8*)dest;

while (n >= 4 && q[0] < 128 && q[1] < 128 && q[2] < 128 && q[3] < 128)

{

p[0] = q[0];

p[1] = q[1];

p[2] = q[2];

p[3] = q[3];

p += 4;

q += 4;

n -= 4;

}

String& String::assign(const Char16* str, Uint32 n)

switch (n)

{

_rep.clear();

case 0:

Uint32 m = _min(StrLen(str), n);

return p - (Uint8*)dest;

_rep.append(str, m);

case 1:

_rep.append('\0');

if (q[0] < 128)

return *this;

{

p[0] = q[0];

return p + 1 - (Uint8*)dest;

}

break;

case 2:

if (q[0] < 128 && q[1] < 128)

{

p[0] = q[0];

p[1] = q[1];

return p + 2 - (Uint8*)dest;

}

break;

case 3:

if (q[0] < 128 && q[1] < 128 && q[2] < 128)

{

p[0] = q[0];

p[1] = q[1];

p[2] = q[2];

return p + 3 - (Uint8*)dest;

}

break;

}

String& String::assign(const char* x)

// If this line was reached, there must be characters greater than 128.

UTF16toUTF8(&q, q + n, &p, p + 3 * n);

return p - (Uint8*)dest;

}

static inline size_t _convert(

Uint16* p, const char* q, size_t n, size_t& utf8_error_index)

{

_rep.clear();

#ifdef PEGASUS_STRING_NO_UTF8

Uint32 n = strlen(x);

_copy(p, q, n);

_rep.reserve(n + 1);

return n;

#else

return _copyFromUTF8(p, q, n, utf8_error_index);

#endif

}

while (n--)

//==============================================================================

_rep.append(*x++);

// class CString

//==============================================================================

CString::CString(const CString& cstr) : _rep(0)

{

if (cstr._rep)

{

size_t n = strlen(cstr._rep) + 1;

_rep = (char*)operator new(n);

memcpy(_rep, cstr._rep, n);

}

_rep.append('\0');

CString& CString::operator=(const CString& cstr)

{

if (&cstr != this)

{

if (_rep)

{

operator delete(_rep);

_rep = 0;

}

if (cstr._rep)

{

size_t n = strlen(cstr._rep) + 1;

_rep = (char*)operator new(n);

memcpy(_rep, cstr._rep, n);

}

return *this;

}

String& String::assign(const char* x, Uint32 n_)

//==============================================================================

// class StringRep

//==============================================================================

StringRep StringRep::_emptyRep;

inline StringRep* StringRep::alloc(size_t cap)

{

_rep.clear();

// Check for potential overflow in cap

PEGASUS_CHECK_CAPACITY_OVERFLOW(cap);

Uint32 n = _min(strlen(x), n_);

StringRep* rep = (StringRep*)::operator new(

_rep.reserve(n + 1);

sizeof(StringRep) + cap * sizeof(Uint16));

rep->cap = cap;

new(&rep->refs) AtomicInt(1);

while (n--)

return rep;

_rep.append(*x++);

}

_rep.append('\0');

static inline void _reserve(StringRep*& rep, Uint32 cap)

{

if (cap > rep->cap || rep->refs.get() != 1)

{

size_t n = _roundUpToPow2(cap);

StringRep* newRep = StringRep::alloc(n);

newRep->size = rep->size;

_copy(newRep->data, rep->data, rep->size + 1);

StringRep::unref(rep);

rep = newRep;

}

return *this;

StringRep* StringRep::create(const Uint16* data, size_t size)

{

StringRep* rep = StringRep::alloc(size);

rep->size = size;

_copy(rep->data, data, size);

rep->data[size] = '\0';

return rep;

}

char* String::allocateCString(Uint32 extraBytes, Boolean noThrow) const

StringRep* StringRep::copyOnWrite(StringRep* rep)

{

Uint32 n = getLength() + 1;

// Return a new copy of rep. Release rep.

char* str = new char[n + extraBytes];

char* p = str;

StringRep* newRep = StringRep::alloc(rep->size);

const Char16* q = getData();

newRep->size = rep->size;

_copy(newRep->data, rep->data, rep->size);

newRep->data[newRep->size] = '\0';

StringRep::unref(rep);

return newRep;

}

for (Uint32 i = 0; i < n; i++)

StringRep* StringRep::create(const char* data, size_t size)

{

Uint16 c = *q++;

StringRep* rep = StringRep::alloc(size);

*p++ = char(c);

size_t utf8_error_index;

rep->size = _convert((Uint16*)rep->data, data, size, utf8_error_index);

if ((c & 0xff00) && !noThrow)

if (rep->size == size_t(-1))

throw TruncatedCharacter();

{

StringRep::free(rep);

_StringThrowBadUTF8(utf8_error_index);

}

return str;

rep->data[rep->size] = '\0';

return rep;

}

void String::appendToCString(

Uint32 StringRep::length(const Uint16* str)

char* str,

Uint32 length,

Boolean noThrow) const

{

if (!str)

// Note: We could unroll this but it is rarely called.

throw NullPointer();

Uint32 n = _min(getLength(), length);

const Uint16* end = (Uint16*)str;

char* p = str + strlen(str);

while (*end++)

const Char16* q = getData();

;

for (Uint32 i = 0; i < n; i++)

return end - str - 1;

}

//==============================================================================

// class String

//==============================================================================

const String String::EMPTY;

String::String(const String& str, Uint32 n)

{

Uint16 c = *q++;

_checkBounds(n, str._rep->size);

*p++ = char(c);

_rep = StringRep::create(str._rep->data, n);

}

if ((c & 0xff00) && !noThrow)

String::String(const Char16* str)

throw TruncatedCharacter();

{

_checkNullPointer(str);

_rep = StringRep::create((Uint16*)str, StringRep::length((Uint16*)str));

}

*p = '\0';

String::String(const Char16* str, Uint32 n)

{

_checkNullPointer(str);

_rep = StringRep::create((Uint16*)str, n);

}

Char16& String::operator[](Uint32 i)

String::String(const char* str)

{

if (i > getLength())

_checkNullPointer(str);

ThrowOutOfBounds();

return _rep[i];

// Set this just in case create() throws an exception.

_rep = &StringRep::_emptyRep;

_rep = StringRep::create(str, strlen(str));

}

const Char16 String::operator[](Uint32 i) const

String::String(const char* str, Uint32 n)

{

if (i > getLength())

_checkNullPointer(str);

ThrowOutOfBounds();

return _rep[i];

// Set this just in case create() throws an exception.

_rep = &StringRep::_emptyRep;

_rep = StringRep::create(str, n);

}

String& String::append(const Char16* str, Uint32 n)

String::String(const String& s1, const String& s2)

{

Uint32 m = _min(StrLen(str), n);

size_t n1 = s1._rep->size;

_rep.reserve(_rep.getSize() + m);

size_t n2 = s2._rep->size;

_rep.remove(_rep.getSize() - 1);

size_t n = n1 + n2;

_rep.append(str, m);

_rep = StringRep::alloc(n);

_rep.append('\0');

_copy(_rep->data, s1._rep->data, n1);

_copy(_rep->data + n1, s2._rep->data, n2);

_rep->size = n;

_rep->data[n] = '\0';

}

String::String(const String& s1, const char* s2)

{

_checkNullPointer(s2);

size_t n1 = s1._rep->size;

size_t n2 = strlen(s2);

_rep = StringRep::alloc(n1 + n2);

_copy(_rep->data, s1._rep->data, n1);

size_t utf8_error_index;

size_t tmp = _convert((Uint16*)_rep->data + n1, s2, n2, utf8_error_index);

if (tmp == size_t(-1))

{

StringRep::free(_rep);

_rep = &StringRep::_emptyRep;

_StringThrowBadUTF8(utf8_error_index);

}

_rep->size = n1 + tmp;

_rep->data[_rep->size] = '\0';

}

String::String(const char* s1, const String& s2)

{

_checkNullPointer(s1);

size_t n1 = strlen(s1);

size_t n2 = s2._rep->size;

_rep = StringRep::alloc(n1 + n2);

size_t utf8_error_index;

size_t tmp = _convert((Uint16*)_rep->data, s1, n1, utf8_error_index);

if (tmp == size_t(-1))

{

StringRep::free(_rep);

_rep = &StringRep::_emptyRep;

_StringThrowBadUTF8(utf8_error_index);

}

_rep->size = n2 + tmp;

_copy(_rep->data + n1, s2._rep->data, n2);

_rep->data[_rep->size] = '\0';

}

String& String::assign(const String& str)

{

if (_rep != str._rep)

{

StringRep::unref(_rep);

StringRep::ref(_rep = str._rep);

}

return *this;

}

void String::remove(Uint32 pos, Uint32 size)

String& String::assign(const Char16* str, Uint32 n)

{

if (size == Uint32(-1))

_checkNullPointer(str);

size = getLength() - pos;

if (pos + size > getLength())

if (n > _rep->cap || _rep->refs.get() != 1)

ThrowOutOfBounds();

{

StringRep::unref(_rep);

_rep = StringRep::alloc(n);

}

_rep->size = n;

_copy(_rep->data, (Uint16*)str, n);

_rep->data[n] = '\0';

if (size)

return *this;

_rep.remove(pos, size);

}

int String::compare(const Char16* s1, const Char16* s2, Uint32 n)

String& String::assign(const char* str, Uint32 n)

{

while (n--)

_checkNullPointer(str);

if (n > _rep->cap || _rep->refs.get() != 1)

{

int r = *s1++ - *s2++;

StringRep::unref(_rep);

_rep = StringRep::alloc(n);

}

if (r)

size_t utf8_error_index;

return r;

_rep->size = _convert(_rep->data, str, n, utf8_error_index);

if (_rep->size == size_t(-1))

{

StringRep::free(_rep);

_rep = &StringRep::_emptyRep;

_StringThrowBadUTF8(utf8_error_index);

}

return 0;

_rep->data[_rep->size] = 0;

return *this;

}

Boolean String::equal(const String& x, const String& y)

void String::clear()

{

if (x.getLength() != y.getLength())

if (_rep->size)

return false;

{

if (_rep->refs.get() == 1)

{

_rep->size = 0;

_rep->data[0] = '\0';

}

else

{

StringRep::unref(_rep);

_rep = &StringRep::_emptyRep;

}

return String::compare(x.getData(), y.getData(), x.getLength()) == 0;

void String::reserveCapacity(Uint32 cap)

{

_reserve(_rep, cap);

}

Boolean String::equal(const String& x, const Char16* y)

CString String::getCString() const

{

if (x.getLength() != StrLen(y))

// A UTF8 string can have three times as many characters as its UTF16

return false;

// counterpart, so we allocate extra memory for the worst case. In the

// best case, we may need only one third of the memory allocated. But

// downsizing the string afterwards is expensive and unecessary since

// CString objects are usually short-lived (disappearing after only a few

// instructions). CString objects are typically created on the stack as

// means to obtain a char* pointer.

return String::compare(x.getData(), y, x.getLength()) == 0;

#ifdef PEGASUS_STRING_NO_UTF8

char* str = (char*)operator new(_rep->size + 1);

_copy(str, _rep->data, _rep->size);

str[_rep->size] = '\0';

return CString(str);

#else

Uint32 n = 3 * _rep->size;

char* str = (char*)operator new(n + 1);

size_t size = _copyToUTF8(str, _rep->data, _rep->size);

str[size] = '\0';

return CString(str);

#endif

}

Boolean String::equal(const Char16* x, const String& y)

String& String::append(const Char16* str, Uint32 n)

{

return equal(y, x);

_checkNullPointer(str);

size_t oldSize = _rep->size;

size_t newSize = oldSize + n;

_reserve(_rep, newSize);

_copy(_rep->data + oldSize, (Uint16*)str, n);

_rep->size = newSize;

_rep->data[newSize] = '\0';

return *this;

}

Boolean String::equal(const String& x, const char* y)

String& String::append(const String& str)

{

return equal(x, String(y));

return append((Char16*)(&(str._rep->data[0])), str._rep->size);

}

Boolean String::equal(const char* x, const String& y)

String& String::append(const char* str, Uint32 size)

{

_checkNullPointer(str);

size_t oldSize = _rep->size;

size_t cap = oldSize + size;

_reserve(_rep, cap);

size_t utf8_error_index;

size_t tmp = _convert(

(Uint16*)_rep->data + oldSize, str, size, utf8_error_index);

if (tmp == size_t(-1))

{

return equal(String(x), y);

StringRep::free(_rep);

_rep = &StringRep::_emptyRep;

_StringThrowBadUTF8(utf8_error_index);

}

_rep->size += tmp;

_rep->data[_rep->size] = '\0';

String String::subString(Uint32 pos, Uint32 length) const

return *this;

}

void String::remove(Uint32 index, Uint32 n)

{

if (pos < getLength())

if (n == PEG_NOT_FOUND)

n = _rep->size - index;

_checkBounds(index + n, _rep->size);

if (_rep->refs.get() != 1)

_rep = StringRep::copyOnWrite(_rep);

PEGASUS_ASSERT(index + n <= _rep->size);

size_t rem = _rep->size - (index + n);

Uint16* data = _rep->data;

if (rem)

memmove(data + index, data + index + n, rem * sizeof(Uint16));

_rep->size -= n;

data[_rep->size] = '\0';

}

String String::subString(Uint32 index, Uint32 n) const

{

// Note: this implementation is very permissive but used for

// backwards compatibility.

if (index < _rep->size)

{

if (length == Uint32(-1))

if (n == PEG_NOT_FOUND || n > _rep->size - index)

length = getLength() - pos;

n = _rep->size - index;

return String(getData() + pos, length);

return String((Char16*)(_rep->data + index), n);

}

else

return String();

}

Uint32 String::find(Char16 c) const

{

const Char16* first = getData();

Uint16* p = (Uint16*)_find(_rep->data, _rep->size, c);

for (const Char16* p = first; *p; p++)

if (p)

{

return static_cast<Uint32>(p - _rep->data);

if (*p == c)

return p - first;

return PEG_NOT_FOUND;

}

return Uint32(-1);

Uint32 String::find(Uint32 index, Char16 c) const

{

_checkBounds(index, _rep->size);

if (index >= _rep->size)

return PEG_NOT_FOUND;

Uint16* p = (Uint16*)_find(_rep->data + index, _rep->size - index, c);

if (p)

return static_cast<Uint32>(p - _rep->data);

return PEG_NOT_FOUND;

}

Uint32 String::find(String& s) const

Uint32 StringFindAux(

const StringRep* _rep, const Char16* s, Uint32 n)

{

// const Char16* first = getData();

_checkNullPointer(s);

const Char16* ps = s.getData();

const Uint16* data = _rep->data;

size_t rem = _rep->size;

// If find first substr char

while (n <= rem)

Uint32 loc;

if ((loc = find(*ps)) != -1)

{

// Set p = Point to next char.

Uint16* p = (Uint16*)_find(data, rem, s[0]);

// Note we retest first char.

const Char16* p = getData() + loc;

// Get length of substring

if (!p)

Uint32 n = s.getLength();

break;

// No match if substr longer than remaining string

if (memcmp(p, s, n * sizeof(Uint16)) == 0)

if ((loc + n) > getLength())

return static_cast<Uint32>(p - _rep->data);

return Uint32(-1);

// Test remaining char for equal

p++;

for (Uint32 i = 0; n > i; i++)

rem -= p - data;

if (*p++ != *ps++ )

data = p;

return Uint32(-1);

}

return loc;

return PEG_NOT_FOUND;

}

// ATTN:KS 5 apr 2000 Need to add the Char16* version.

Uint32 String::find(const char* s) const

{

_checkNullPointer(s);

// Note: could optimize away creation of temporary, but this is rarely

// called.

return find(String(s));

}

Uint32 String::reverseFind(Char16 c) const

{

const Char16* first = getData();

Uint16 x = c;

const Char16* last = getData() + getLength();

Uint16* p = _rep->data;

Uint16* q = _rep->data + _rep->size;

while (last != first)

while (q != p)

{

if (*--last == c)

if (*--q == x)

return last - first;

return static_cast<Uint32>(q - p);

}

return Uint32(-1);

return PEG_NOT_FOUND;

}

int String::compare(const Char16* s1, const Char16* s2)

void String::toLower()

{

#ifdef PEGASUS_HAS_ICU

if (InitializeICU::initICUSuccessful())

{

if (_rep->refs.get() != 1)

_rep = StringRep::copyOnWrite(_rep);

// This will do a locale-insensitive, but context-sensitive convert.

// Since context-sensitive casing looks at adjacent chars, this

// prevents optimizations where the us-ascii is converted before

// calling ICU.

// The string may shrink or expand after the convert.

//// First calculate size of resulting string. u_strToLower() returns

//// only the size when zero is passed as the destination size argument.

UErrorCode err = U_ZERO_ERROR;

int32_t newSize = u_strToLower(

NULL, 0, (UChar*)_rep->data, _rep->size, NULL, &err);

err = U_ZERO_ERROR;

//// Reserve enough space for the result.

if ((Uint32)newSize > _rep->cap)

_reserve(_rep, newSize);

//// Perform the conversion (overlapping buffers are allowed).

u_strToLower((UChar*)_rep->data, newSize,

(UChar*)_rep->data, _rep->size, NULL, &err);

_rep->size = newSize;

return;

}

#endif /* PEGASUS_HAS_ICU */

if (_rep->refs.get() != 1)

_rep = StringRep::copyOnWrite(_rep);

Uint16* p = _rep->data;

size_t n = _rep->size;

for (; n--; p++)

{

if (!(*p & 0xFF00))

*p = _toLower(*p);

}

void String::toUpper()

{

#ifdef PEGASUS_HAS_ICU

if (InitializeICU::initICUSuccessful())

{

if (_rep->refs.get() != 1)

_rep = StringRep::copyOnWrite(_rep);

// This will do a locale-insensitive, but context-sensitive convert.

// Since context-sensitive casing looks at adjacent chars, this

// prevents optimizations where the us-ascii is converted before

// calling ICU.

// The string may shrink or expand after the convert.

//// First calculate size of resulting string. u_strToUpper() returns

//// only the size when zero is passed as the destination size argument.

UErrorCode err = U_ZERO_ERROR;

int32_t newSize = u_strToUpper(

NULL, 0, (UChar*)_rep->data, _rep->size, NULL, &err);

err = U_ZERO_ERROR;

//// Reserve enough space for the result.

if ((Uint32)newSize > _rep->cap)

_reserve(_rep, newSize);

//// Perform the conversion (overlapping buffers are allowed).

u_strToUpper((UChar*)_rep->data, newSize,

(UChar*)_rep->data, _rep->size, NULL, &err);

_rep->size = newSize;

return;

}

#endif /* PEGASUS_HAS_ICU */

if (_rep->refs.get() != 1)

_rep = StringRep::copyOnWrite(_rep);

Uint16* p = _rep->data;

size_t n = _rep->size;

for (; n--; p++)

*p = _toUpper(*p);

}

int String::compare(const String& s1, const String& s2, Uint32 n)

{

const Uint16* p1 = s1._rep->data;

const Uint16* p2 = s2._rep->data;

while (n--)

{

int r = *p1++ - *p2++;

if (r)

{

return r;

}

else if (!p1[-1])

{

// We must have encountered a null terminator in both s1 and s2

return 0;

}

return 0;

}

int String::compare(const String& s1, const String& s2)

{

return _compare(s1._rep->data, s2._rep->data);

}

int String::compare(const String& s1, const char* s2)

{

_checkNullPointer(s2);

#ifdef PEGASUS_STRING_NO_UTF8

return _compareNoUTF8(s1._rep->data, s2);

#else

// ATTN: optimize this!

return String::compare(s1, String(s2));

#endif

}

int String::compareNoCase(const String& str1, const String& str2)

{

#ifdef PEGASUS_HAS_ICU

if (InitializeICU::initICUSuccessful())

{

return u_strcasecmp(

(const UChar*)str1._rep->data,

(const UChar*)str2._rep->data,

U_FOLD_CASE_DEFAULT

);

}

#endif /* PEGASUS_HAS_ICU */

const Uint16* s1 = str1._rep->data;

const Uint16* s2 = str2._rep->data;

while (*s1 && *s2)

{

int r = *s1++ - *s2++;

int r = _toLower(*s1++) - _toLower(*s2++);

if (r)

return r;

Line 390

Line 1131

return 0;

}

std::ostream& operator<<(std::ostream& os, const String& x)

Boolean StringEqualNoCase(const String& s1, const String& s2)

{

for (Uint32 i = 0, n = x.getLength(); i < n; i++)

#ifdef PEGASUS_HAS_ICU

os << x[i];

return os;

return String::compareNoCase(s1, s2) == 0;

#else /* PEGASUS_HAS_ICU */

// The following employs loop unrolling for efficiency. Please do not

// eliminate.

Uint16* p = (Uint16*)s1.getChar16Data();

Uint16* q = (Uint16*)s2.getChar16Data();

Uint32 n = s2.size();

while (n >= 8)

{

if (((p[0] - q[0]) && (_toUpper(p[0]) - _toUpper(q[0]))) ||

((p[1] - q[1]) && (_toUpper(p[1]) - _toUpper(q[1]))) ||

((p[2] - q[2]) && (_toUpper(p[2]) - _toUpper(q[2]))) ||

((p[3] - q[3]) && (_toUpper(p[3]) - _toUpper(q[3]))) ||

((p[4] - q[4]) && (_toUpper(p[4]) - _toUpper(q[4]))) ||

((p[5] - q[5]) && (_toUpper(p[5]) - _toUpper(q[5]))) ||

((p[6] - q[6]) && (_toUpper(p[6]) - _toUpper(q[6]))) ||

((p[7] - q[7]) && (_toUpper(p[7]) - _toUpper(q[7]))))

{

return false;

}

n -= 8;

p += 8;

q += 8;

}

while (n >= 4)

{

if (((p[0] - q[0]) && (_toUpper(p[0]) - _toUpper(q[0]))) ||

((p[1] - q[1]) && (_toUpper(p[1]) - _toUpper(q[1]))) ||

((p[2] - q[2]) && (_toUpper(p[2]) - _toUpper(q[2]))) ||

((p[3] - q[3]) && (_toUpper(p[3]) - _toUpper(q[3]))))

{

return false;

}

n -= 4;

p += 4;

q += 4;

}

while (n--)

{

if (((p[0] - q[0]) && (_toUpper(p[0]) - _toUpper(q[0]))))

return false;

p++;

q++;

}

return true;

#endif /* PEGASUS_HAS_ICU */

}

Boolean String::equalNoCase(const String& s1, const char* s2)

{

_checkNullPointer(s2);

#if defined(PEGASUS_HAS_ICU)

return String::equalNoCase(s1, String(s2));

#elif defined(PEGASUS_STRING_NO_UTF8)

const Uint16* p1 = (Uint16*)s1._rep->data;

const char* p2 = s2;

size_t n = s1._rep->size;

while (n--)

{

if (!*p2)

return false;

if (_toUpper(*p1++) != _toUpperTable[int(*p2++)])

return false;

}

if (*p2)

return false;

return true;

#else /* PEGASUS_HAS_ICU */

// ATTN: optimize this!

return String::equalNoCase(s1, String(s2));

#endif /* PEGASUS_HAS_ICU */

}

void String::toLower(char* str)

Boolean String::equal(const String& s1, const String& s2)

{

while (*str)

return s1._rep->size == s2._rep->size && memcmp(s1._rep->data,

tolower(*str++);

s2._rep->data, s1._rep->size * sizeof(Uint16)) == 0;

}

String ToLower(const String& str)

Boolean String::equal(const String& s1, const char* s2)

{

String tmp(str);

#ifdef PEGASUS_STRING_NO_UTF8

_checkNullPointer(s2);

const Uint16* p = (Uint16*)s1._rep->data;

const char* q = s2;

for (Uint32 i = 0, n = tmp.getLength(); i < n; i++)

while (*p && *q)

{

Char16 c = tmp[i];

if (*p++ != Uint16(*q++))

return false;

}

return !(*p || *q);

#else /* PEGASUS_STRING_NO_UTF8 */

if (c <= 127)

return String::equal(s1, String(s2));

tmp[i] = tolower(c);

#endif /* PEGASUS_STRING_NO_UTF8 */

}

return tmp;

PEGASUS_STD(ostream)& operator<<(PEGASUS_STD(ostream)& os, const String& str)

{

#if defined(PEGASUS_OS_OS400)

CString cstr = str.getCString();

const char* utf8str = cstr;

os << utf8str;

return os;

#else

#if defined(PEGASUS_HAS_ICU)

if (InitializeICU::initICUSuccessful())

{

char *buf = NULL;

const int size = str.size() * 6;

UnicodeString UniStr(

(const UChar *)str.getChar16Data(), (int32_t)str.size());

Uint32 bufsize = UniStr.extract(0,size,buf);

buf = new char[bufsize+1];

UniStr.extract(0,bufsize,buf);

os << buf;

os.flush();

delete [] buf;

return os;

}

#endif // PEGASUS_HAS_ICU

for (Uint32 i = 0, n = str.size(); i < n; i++)

{

Uint16 code = str[i];

if (code > 0 && !(code & 0xFF00))

os << char(code);

else

{

// Print in hex format:

char buffer[8];

sprintf(buffer, "\\x%04X", code);

os << buffer;

}

return os;

#endif // PEGASUS_OS_OS400

}

void StringAppendCharAux(StringRep*& _rep)

{

StringRep* tmp;

if (_rep->cap)

{

tmp = StringRep::alloc(2 * _rep->cap);

tmp->size = _rep->size;

_copy(tmp->data, _rep->data, _rep->size);

}

else

{

tmp = StringRep::alloc(8);

tmp->size = 0;

}

StringRep::unref(_rep);

_rep = tmp;

}

PEGASUS_NAMESPACE_END

================================================================================

String optimizations:

1. Added mechanism allowing certain functions to be inlined only when

used by internal Pegasus modules. External modules (i.e., providers)

link to a non-inline version, which allows for binary compatibility.

2. Implemented copy-on-write with atomic increment/decrement. This

yieled a 10% improvement for the 'gc' benchmark and a 11% improvment

for the 'ni1000' benchmark.

3. Employed loop unrolling in several places. For example, see:

static Uint16* _find(const Uint16* s, size_t n, Uint16 c);

4. Used the "empty-rep" optimization (described in whitepaper from the

GCC Developers Summit). This reduced default construction to a simple

pointer assignment.

inline String::String() : _rep(&_emptyRep) { }

5. Implemented Uint16 versions of toupper() and tolower() using tables.

For example:

static const char _upper[] =

{

0,1,2,...255

};

inline Uint16 _toUpper(Uint16 x)

{

return (x & 0xFF00) ? x : _upper[x];

}

This outperforms the system implementation by avoiding an anding

operation.

6. Implemented char* version of the following member functions to

eliminate unecessary creation of anonymous string objects

(temporaries).

String(const String& s1, const char* s2);

String(const char* s1, const String& s2);

String& String::operator=(const char* str);

Uint32 String::find(const char* s) const;

bool String::equal(const String& s1, const char* s2);

static int String::compare(const String& s1, const char* s2);

String& String::append(const char* str);

String& String::append(const char* str, Uint32 size);

static bool String::equalNoCase(const String& s1, const char* s2);

String& operator=(const char* str)

String& String::assign(const char* str)

String& String::append(const char* str)

Boolean operator==(const String& s1, const char* s2)

Boolean operator==(const char* s1, const String& s2)

Boolean operator!=(const String& s1, const char* s2)

Boolean operator!=(const char* s1, const String& s2)

Boolean operator<(const String& s1, const char* s2)

Boolean operator<(const char* s1, const String& s2)

Boolean operator>(const String& s1, const char* s2)

Boolean operator>(const char* s1, const String& s2)

Boolean operator<=(const String& s1, const char* s2)

Boolean operator<=(const char* s1, const String& s2)

Boolean operator>=(const String& s1, const char* s2)

Boolean operator>=(const char* s1, const String& s2)

String operator+(const String& s1, const char* s2)

String operator+(const char* s1, const String& s2)

7. Optimized _roundUpToPow2(), used in rounding the capacity to the next

power of two (algorithm from the book "Hacker's Delight").

static Uint32 _roundUpToPow2(Uint32 x)

{

if (x < 8)

return 8;

x--;

x |= (x >> 1);

x |= (x >> 2);

x |= (x >> 4);

x |= (x >> 8);

x |= (x >> 16);

x++;

return x;

}

8. Implemented "concatenating constructors" to eliminate temporaries

created by operator+(). This scheme employs the "return-value

optimization" described by Stan Lippman.

inline String operator+(const String& s1, const String& s2)

{

return String(s1, s2, 0);

}

9. Experimented to find the optimial initial size for a short string.

Eight seems to offer the best tradeoff between space and time.

10. Inlined all members of the Char16 class.

11. Used Uint16 internally in the String class. This showed no improvememnt

since Char16 was already fully inlined and was essentially reduced to

Uint16 in any case.

12. Implemented conditional logic (#if) allowing error checking logic to

be excluded to better performance. Examples include bounds checking

and null-pointer checking.

13. Used memcpy() and memcmp() where possible. These are implemented using

the rep family of intructions under Intel and are much faster.

14. Used loop unrolling, jump-tables, and short-circuiting to reduce UTF8

copy routine overhead.

15. Added ASCII7 form of the constructor and assign().

String s("hello world", String::ASCII7);

s.assignASCII7("hello world");

This avoids slower UTF8 processing when not needed.

================================================================================

TO-DO:

(+) [DONE] Use PEGASUS_USE_EXPERIMENTAL_INTERFACES

(+) [DONE] Submit BUG-2754 (Windows buffer limit).

(+) [DONE] Eliminate char versions of find() and append().

(+) [DONE] Remove PEGASUS_MAX_PRINTABLE_CHARACTER from Config.h

(+) [DONE] Change _next_pow_2() to _roundUpToPow2().

(+) [DONE] Change '99' to '2' in StringRep constructor (comment as well).

(+) [DONE] Comment StringRep allocation layout.

(+) [DONE] Conceal private inline functions.

(+) [DONE] Shorten inclusion of StringInline.h in String.h.

(+) [DONE] Change USE_INTERNAL_INLINE TO DISABLE_INTERNAL_INLINE or get

rid of altogether.

(+) [DONE] useCamelNotationOnAllFunctionNames.

(+) [DONE] Check for overlow condition in StringRep::alloc().

(+) [DONE] Remove tabs (used vim ":set expandtab" and ":retab").

(+) [DONE] Fix throw-related memory leak.

(+) [DONE] Look at PEP223 for coding security guidelines.

(+) [DONE] Use old AtomicInt for now (new AtomicInt part of bug #4250).

(+) [DONE] Removed appendASCII() and the ASCII form of the constructor.

(+) DOC++ String.h - will open new bug?

(+) Added PEGASUS_DISABLE_INTERNAL_INLINES macro (to permit suppression

on certain platforms).

================================================================================

Legend:

Removed from v.1.6
changed lines
	Added in v.1.124

No CVS admin address has been configured