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// -*- C++ -*- $Id$
#include "ACEXML/common/Transcode.h"
#include "ace/OS_NS_string.h"
int
ACEXML_Transcoder::utf162utf8 (ACEXML_UTF16 src,
ACEXML_UTF8 *dst,
size_t len)
{
// Check for valid argument first...
if (dst == 0)
return ACEXML_INVALID_ARGS;
if (src < 0x80)
{
if (len < 1)
return ACEXML_DESTINATION_TOO_SHORT;
*dst = static_cast<ACEXML_UTF8> (src);
return 1;
}
else if (src < 0x800)
{
if (len < 2)
return ACEXML_DESTINATION_TOO_SHORT;
*dst = 0xc0 | (src / 0x40);
*(dst+1) = 0x80 | (src % 0x40);
return 2;
}
else
{
if (len < 3)
return ACEXML_DESTINATION_TOO_SHORT;
// Surrogates (0xD800 - 0xDFFF) are not valid unicode values
if (src >= 0xD800 && src < 0xE000)
return ACEXML_IS_SURROGATE;
*dst = 0xe0 | (src / 0x1000);
*(dst+1) = 0x80 | ((src % 0x1000) / 0x40);
*(dst+2) = 0x80 | (src % 0x40);
return 3;
}
ACE_NOTREACHED (return ACEXML_NON_UNICODE;)
}
int
ACEXML_Transcoder::ucs42utf8 (ACEXML_UCS4 src,
ACEXML_UTF8 *dst,
size_t len)
{
if (src < 0x10000)
{
int retv = ACEXML_Transcoder::utf162utf8
(static_cast<ACEXML_UTF16> (src),
dst, len);
return (retv == ACEXML_IS_SURROGATE ? ACEXML_NON_UNICODE : retv);
}
else if (src >= 0x100000 && src < 0x110000)
{
if (len < 4)
return ACEXML_DESTINATION_TOO_SHORT;
if (dst == 0)
return ACEXML_INVALID_ARGS;
*dst = 0xf0 | (src / 0x40000);
*(dst+1) = 0x80 | ((src % 0x40000) / 0x1000);
*(dst+2) = 0x80 | ((src % 0x1000) / 0x40);
*(dst+3) = 0x80 | (src % 0x40);
return 4;
}
return ACEXML_NON_UNICODE;
}
int
ACEXML_Transcoder::ucs42utf16 (ACEXML_UCS4 src,
ACEXML_UTF16 *dst,
size_t len)
{
if (dst == 0)
return ACEXML_INVALID_ARGS;
if (src < 0x10000)
{
if (len < 1)
return ACEXML_DESTINATION_TOO_SHORT;
if (src >= 0xD800 && src < 0xE000)
return ACEXML_NON_UNICODE; // Surrogates are not valid unicode value
*dst = static_cast<ACEXML_UTF16> (src);
return 1;
}
else if (src >= 0x100000 && src < 0x110000)
// Scalar values are encoded into surrogates
{
if (len < 2)
return ACEXML_DESTINATION_TOO_SHORT;
*dst = 0xD800 | (src / 0x400);
*(dst+1) = 0xDC00 | (src % 0x400);
return 2;
}
return ACEXML_NON_UNICODE;
}
int
ACEXML_Transcoder::surrogate2utf8 (ACEXML_UTF16 high,
ACEXML_UTF16 low,
ACEXML_UTF8 *dst,
size_t len)
{
if (len < 3)
return ACEXML_DESTINATION_TOO_SHORT;
if (dst == 0 ||
(high >= 0xD800 && high < 0xDC00) ||
(low >= 0xDC00 && low < 0xE000))
return ACEXML_INVALID_ARGS;
ACEXML_UCS4 src = (high - 0xD800) * 0x400 + (low - 0xDC00) + 0x10000;
*dst = 0xD800 | (src / 0x400);
*(dst+1) = 0xDC00 | (src % 0x400);
return 2;
}
int
ACEXML_Transcoder::surrogate2ucs4 (ACEXML_UTF16 high,
ACEXML_UTF16 low,
ACEXML_UCS4 &dst)
{
if ((high >= 0xD800 && high < 0xDC00) ||
(low >= 0xDC00 && low < 0xE000))
return ACEXML_INVALID_ARGS;
dst = (high - 0xD800) * 0x400 + (low - 0xDC00) + 0x10000;
return ACEXML_SUCCESS;
}
int
ACEXML_Transcoder::utf82ucs4 (const ACEXML_UTF8 *the_src,
size_t len,
ACEXML_UCS4 &dst)
{
if (the_src == 0)
return ACEXML_INVALID_ARGS;
const unsigned char *src = reinterpret_cast<const unsigned char *> (the_src);
size_t forward = 1;
if (forward > len)
return ACEXML_END_OF_SOURCE;
if (static_cast<unsigned char> (*src) < 0x80)
dst = *src;
else if ((*src & 0xE0) == 0xC0)
{
dst = (*(src++) & 0x1f) * 0x40;
if (++forward > len)
return ACEXML_END_OF_SOURCE;
if ((*src & 0xC0) != 0x80)
return ACEXML_NON_UNICODE; // Error transcoding unicode scalar
dst += *src & 0x3f;
}
else if ((*src & 0xF0) == 0xE0)
{
dst = (*src++ & 0x0f) * 0x40;
if (++forward > len)
return ACEXML_END_OF_SOURCE;
if ((*src & 0xC0) != 0x80)
return ACEXML_NON_UNICODE;
dst = (dst + (*src++ & 0x3f)) * 0x40;
if (++forward > len)
return ACEXML_END_OF_SOURCE;
if ((*src & 0xC0) != 0x80)
return ACEXML_NON_UNICODE;
dst += *src & 0x3f;
}
else if ((*src & 0xF8) == 0xF0)
{
dst = (*src++ & 0x0f) * 0x40;
if (++forward > len)
return ACEXML_END_OF_SOURCE;
if ((*src & 0xC0) != 0x80)
return ACEXML_NON_UNICODE;
dst = (dst + (*src++ & 0x3f)) * 0x40;
if (++forward > len)
return ACEXML_END_OF_SOURCE;
if ((*src & 0xC0) != 0x80)
return ACEXML_NON_UNICODE;
dst = (dst + (*src++ & 0x3f)) * 0x40;
if (++forward > len)
return ACEXML_END_OF_SOURCE;
if ((*src & 0xC0) != 0x80)
return ACEXML_NON_UNICODE;
dst += *src & 0x3f;
}
else
return ACEXML_NON_UNICODE;
return forward;
}
int
ACEXML_Transcoder::utf162ucs4 (const ACEXML_UTF16 *src,
size_t len,
ACEXML_UCS4 &dst)
{
if (src == 0)
return ACEXML_INVALID_ARGS;
size_t forward = 1;
if (*src >= 0xDC00 && *src < 0xE000)
{
if (len < 2)
return ACEXML_END_OF_SOURCE;
return ACEXML_Transcoder::surrogate2ucs4 (*src,
*(src+1),
dst);
}
else
{
if (len < 1)
return ACEXML_END_OF_SOURCE;
dst = *src;
}
return forward;
}
int
ACEXML_Transcoder::utf8s2utf16s (const ACEXML_UTF8 *src,
ACEXML_UTF16 *dst,
size_t len)
{
if (src == 0 || dst == 0)
return ACEXML_INVALID_ARGS;
size_t src_len = ACE_OS::strlen (src) + 1;
size_t total_len = 0;
int forward;
ACEXML_UCS4 temp;
while (src_len > 0)
{
if ((forward = ACEXML_Transcoder::utf82ucs4 (src,
src_len,
temp)) <= 0)
return forward;
src += forward;
src_len -= forward;
if ((forward = ACEXML_Transcoder::ucs42utf16 (temp,
dst,
len)) <= 0)
return forward;
total_len += forward;
dst += forward;
len -= forward;
}
return static_cast<int> (total_len);
}
int
ACEXML_Transcoder::utf16s2utf8s (const ACEXML_UTF16 *src,
ACEXML_UTF8 *dst,
size_t len)
{
if (src == 0 || dst == 0)
return ACEXML_INVALID_ARGS;
size_t src_len = 1;
for (const ACEXML_UTF16 *p = src; *p++ != 0; ++src_len)
;
size_t total_len = 0;
int forward;
ACEXML_UCS4 temp;
while (src_len > 0)
{
if ((forward = ACEXML_Transcoder::utf162ucs4 (src,
src_len,
temp)) <= 0)
return forward;
src += forward;
src_len -= forward;
if ((forward = ACEXML_Transcoder::ucs42utf8 (temp,
dst,
len)) <= 0)
return forward;
total_len += forward;
dst += forward;
len -= forward;
}
return static_cast<int> (total_len);
}
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