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// ======================================================================
//
// The actual conversion methods are covered by the copyright information
// below. It is not the actual code provided by Unicode, Inc. but is an
// ACE-ified and only slightly modified version.
//
// Chad Elliott 4/28/2005
//
// Copyright 2001-2004 Unicode, Inc.
//
// Limitations on Rights to Redistribute This Code
//
// Unicode, Inc. hereby grants the right to freely use the information
// supplied in this file in the creation of products supporting the
// Unicode Standard, and to make copies of this file in any form
// for internal or external distribution as long as this notice
// remains attached.
//
// ======================================================================
#include "ace/UTF32_Encoding_Converter.h"
#if defined (ACE_USES_WCHAR)
#include "ace/OS_NS_stdio.h"
#include "ace/OS_Memory.h"
#include "ace/Min_Max.h"
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
static const ACE_UINT32 UNI_MAX_LEGAL_UTF32 = 0x0010FFFF;
ACE_UTF32_Encoding_Converter::ACE_UTF32_Encoding_Converter (bool swap)
: ACE_UTF16_Encoding_Converter (swap)
{
}
ACE_UTF32_Encoding_Converter::~ACE_UTF32_Encoding_Converter (void)
{
}
ACE_UTF32_Encoding_Converter::Result
ACE_UTF32_Encoding_Converter::to_utf8 (const void* source,
size_t source_size,
ACE_Byte* target,
size_t target_size,
bool strict)
{
static const ACE_UINT32 byteMask = 0xBF;
static const ACE_UINT32 byteMark = 0x80;
static const ACE_UINT32 UNI_SUR_HIGH_START = get_UNI_SUR_HIGH_START ();
static const ACE_UINT32 UNI_SUR_LOW_END = get_UNI_SUR_LOW_END ();
static const ACE_Byte* firstByteMark = get_first_byte_mark ();
Result result = CONVERSION_OK;
ACE_Byte* targetEnd = target + target_size;
const ACE_UINT32* sourceStart = static_cast<const ACE_UINT32*> (source);
const ACE_UINT32* sourceEnd = sourceStart + (source_size / sizeof (ACE_UINT32));
while (sourceStart < sourceEnd)
{
ACE_UINT32 nw = *sourceStart++;
ACE_UINT32 ch = (this->swap_ ? ACE_SWAP_LONG (nw) : nw);
unsigned short bytesToWrite = 0;
if (strict)
{
// UTF-16 surrogate values are illegal in UTF-32
if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END)
{
result = SOURCE_ILLEGAL;
break;
}
}
// Figure out how many bytes the result will require. Turn any
// illegally large ACE_UINT32 things (> Plane 17) into replacement
// chars.
if (ch < 0x80)
{
bytesToWrite = 1;
}
else if (ch < 0x800)
{
bytesToWrite = 2;
}
else if (ch < 0x10000)
{
bytesToWrite = 3;
}
else if (ch <= UNI_MAX_LEGAL_UTF32)
{
bytesToWrite = 4;
}
else
{
result = SOURCE_ILLEGAL;
break;
}
target += bytesToWrite;
if (target > targetEnd)
{
result = TARGET_EXHAUSTED;
break;
}
// NOTE: everything falls through.
switch (bytesToWrite)
{
case 4:
*--target = (ACE_Byte)((ch | byteMark) & byteMask);
ch >>= 6;
case 3:
*--target = (ACE_Byte)((ch | byteMark) & byteMask);
ch >>= 6;
case 2:
*--target = (ACE_Byte)((ch | byteMark) & byteMask);
ch >>= 6;
case 1:
*--target = (ACE_Byte) (ch | firstByteMark[bytesToWrite]);
}
target += bytesToWrite;
}
return result;
}
ACE_UTF32_Encoding_Converter::Result
ACE_UTF32_Encoding_Converter::from_utf8 (const ACE_Byte* source,
size_t source_size,
void* target,
size_t target_size,
bool strict)
{
static const ACE_UINT32 UNI_SUR_HIGH_START = get_UNI_SUR_HIGH_START ();
static const ACE_UINT32 UNI_SUR_LOW_END = get_UNI_SUR_LOW_END ();
static const ACE_UINT32 UNI_REPLACEMENT_CHAR = get_UNI_REPLACEMENT_CHAR ();
static const ACE_Byte* trailingBytesForUTF8 = get_trailing_bytes_for_utf8 ();
static const ACE_UINT32* offsetsFromUTF8 = get_offsets_from_utf8 ();
Result result = CONVERSION_OK;
const ACE_Byte* sourceEnd = source + source_size;
ACE_UINT32* targetStart = static_cast<ACE_UINT32*> (target);
ACE_UINT32* targetEnd = targetStart + target_size;
while (source < sourceEnd)
{
ACE_UINT32 ch = 0;
unsigned short extraBytesToRead = trailingBytesForUTF8[*source];
if (source + extraBytesToRead >= sourceEnd)
{
result = SOURCE_EXHAUSTED;
break;
}
// Do this check whether lenient or strict
if (!this->is_legal_utf8 (source, extraBytesToRead + 1))
{
result = SOURCE_ILLEGAL;
break;
}
// The cases all fall through. See "Note A" below.
switch (extraBytesToRead)
{
case 5:
ch += *source++;
ch <<= 6;
case 4:
ch += *source++;
ch <<= 6;
case 3:
ch += *source++;
ch <<= 6;
case 2:
ch += *source++;
ch <<= 6;
case 1:
ch += *source++;
ch <<= 6;
case 0:
ch += *source++;
}
ch -= offsetsFromUTF8[extraBytesToRead];
if (targetStart >= targetEnd)
{
result = TARGET_EXHAUSTED;
break;
}
if (ch <= UNI_MAX_LEGAL_UTF32)
{
// UTF-16 surrogate values are illegal in UTF-32, and anything
// over Plane 17 (> 0x10FFFF) is illegal.
if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END)
{
if (strict)
{
result = SOURCE_ILLEGAL;
break;
}
else
{
*targetStart++ = UNI_REPLACEMENT_CHAR;
}
}
else
{
*targetStart++ = ch;
}
}
else
{
result = SOURCE_ILLEGAL;
break;
}
}
return result;
}
ACE_UTF32_Encoding_Converter*
ACE_UTF32_Encoding_Converter::encoded (const ACE_Byte* source,
size_t source_size)
{
static const size_t begin = 16;
static const size_t converted = begin * 4;
ACE_Byte target[converted];
ACE_UTF32_Encoding_Converter* converter = 0;
ACE_NEW_RETURN (converter,
ACE_UTF32_Encoding_Converter (false),
0);
if (converter->to_utf8 (source,
ACE_MIN (begin, source_size),
target,
converted) == CONVERSION_OK)
{
return converter;
}
else
{
delete converter;
}
return 0;
}
ACE_END_VERSIONED_NAMESPACE_DECL
#endif /* ACE_USES_WCHAR */
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