libs/utils/String16.cpp - platform/frameworks/base - Git at Google

 /*
  * Copyright (C) 2005 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include <utils/String16.h>

 #include <utils/Debug.h>
 #include <utils/Log.h>
 #include <utils/String8.h>
 #include <utils/TextOutput.h>
 #include <utils/threads.h>

 #include <private/utils/Static.h>

 #ifdef HAVE_WINSOCK
 # undef  nhtol
 # undef  htonl
 # undef  nhtos
 # undef  htons

 # ifdef HAVE_LITTLE_ENDIAN
 #  define ntohl(x)    ( ((x) << 24) | (((x) >> 24) & 255) | (((x) << 8) & 0xff0000) | (((x) >> 8) & 0xff00) )
 #  define htonl(x)    ntohl(x)
 #  define ntohs(x)    ( (((x) << 8) & 0xff00) | (((x) >> 8) & 255) )
 #  define htons(x)    ntohs(x)
 # else
 #  define ntohl(x)    (x)
 #  define htonl(x)    (x)
 #  define ntohs(x)    (x)
 #  define htons(x)    (x)
 # endif
 #else
 # include <netinet/in.h>
 #endif

 #include <memory.h>
 #include <stdio.h>
 #include <ctype.h>

 // ---------------------------------------------------------------------------

 int strcmp16(const char16_t *s1, const char16_t *s2)
 {
   char16_t ch;
   int d = 0;

   while ( 1 ) {
     d = (int)(ch = *s1++) - (int)*s2++;
     if ( d || !ch )
       break;
   }

   return d;
 }

 int strncmp16(const char16_t *s1, const char16_t *s2, size_t n)
 {
   char16_t ch;
   int d = 0;

   while ( n-- ) {
     d = (int)(ch = *s1++) - (int)*s2++;
     if ( d || !ch )
       break;
   }

   return d;
 }

 char16_t *strcpy16(char16_t *dst, const char16_t *src)
 {
   char16_t *q = dst;
   const char16_t *p = src;
   char16_t ch;

   do {
     *q++ = ch = *p++;
   } while ( ch );

   return dst;
 }

 size_t strlen16(const char16_t *s)
 {
   const char16_t *ss = s;
   while ( *ss )
     ss++;
   return ss-s;
 }


 char16_t *strncpy16(char16_t *dst, const char16_t *src, size_t n)
 {
   char16_t *q = dst;
   const char16_t *p = src;
   char ch;

   while (n) {
     n--;
     *q++ = ch = *p++;
     if ( !ch )
       break;
   }

   *q = 0;

   return dst;
 }

 size_t strnlen16(const char16_t *s, size_t maxlen)
 {
   const char16_t *ss = s;

   /* Important: the maxlen test must precede the reference through ss;
      since the byte beyond the maximum may segfault */
   while ((maxlen > 0) && *ss) {
     ss++;
     maxlen--;
   }
   return ss-s;
 }

 int strzcmp16(const char16_t *s1, size_t n1, const char16_t *s2, size_t n2)
 {
     const char16_t* e1 = s1+n1;
     const char16_t* e2 = s2+n2;

     while (s1 < e1 && s2 < e2) {
         const int d = (int)*s1++ - (int)*s2++;
         if (d) {
             return d;
         }
     }

     return n1 < n2
         ? (0 - (int)*s2)
         : (n1 > n2
            ? ((int)*s1 - 0)
            : 0);
 }

 int strzcmp16_h_n(const char16_t *s1H, size_t n1, const char16_t *s2N, size_t n2)
 {
     const char16_t* e1 = s1H+n1;
     const char16_t* e2 = s2N+n2;

     while (s1H < e1 && s2N < e2) {
         const char16_t c2 = ntohs(*s2N);
         const int d = (int)*s1H++ - (int)c2;
         s2N++;
         if (d) {
             return d;
         }
     }

     return n1 < n2
         ? (0 - (int)ntohs(*s2N))
         : (n1 > n2
            ? ((int)*s1H - 0)
            : 0);
 }

 // ---------------------------------------------------------------------------

 namespace android {

 static inline size_t
 utf8_char_len(uint8_t ch)
 {
     return ((0xe5000000 >> ((ch >> 3) & 0x1e)) & 3) + 1;
 }

 #define UTF8_SHIFT_AND_MASK(unicode, byte)  (unicode)<<=6; (unicode) |= (0x3f & (byte));

 static inline uint32_t
 utf8_to_utf32(const uint8_t *src, size_t length)
 {
     uint32_t unicode;

     switch (length)
     {
         case 1:
             return src[0];
         case 2:
             unicode = src[0] & 0x1f;
             UTF8_SHIFT_AND_MASK(unicode, src[1])
             return unicode;
         case 3:
             unicode = src[0] & 0x0f;
             UTF8_SHIFT_AND_MASK(unicode, src[1])
             UTF8_SHIFT_AND_MASK(unicode, src[2])
             return unicode;
         case 4:
             unicode = src[0] & 0x07;
             UTF8_SHIFT_AND_MASK(unicode, src[1])
             UTF8_SHIFT_AND_MASK(unicode, src[2])
             UTF8_SHIFT_AND_MASK(unicode, src[3])
             return unicode;
         default:
             return 0xffff;
     }

     //printf("Char at %p: len=%d, utf-16=%p\n", src, length, (void*)result);
 }

 // ---------------------------------------------------------------------------

 static SharedBuffer* gEmptyStringBuf = NULL;
 static char16_t* gEmptyString = NULL;

 static inline char16_t* getEmptyString()
 {
     gEmptyStringBuf->acquire();
    return gEmptyString;
 }

 void initialize_string16()
 {
     SharedBuffer* buf = SharedBuffer::alloc(sizeof(char16_t));
     char16_t* str = (char16_t*)buf->data();
     *str = 0;
     gEmptyStringBuf = buf;
     gEmptyString = str;
 }

 void terminate_string16()
 {
     SharedBuffer::bufferFromData(gEmptyString)->release();
     gEmptyStringBuf = NULL;
     gEmptyString = NULL;
 }

 // ---------------------------------------------------------------------------

 static char16_t* allocFromUTF8(const char* in, size_t len)
 {
     if (len == 0) return getEmptyString();

     size_t chars = 0;
     const char* end = in+len;
     const char* p = in;

     while (p < end) {
         chars++;
         int utf8len = utf8_char_len(*p);
         uint32_t codepoint = utf8_to_utf32((const uint8_t*)p, utf8len);
         if (codepoint > 0xFFFF) chars++; // this will be a surrogate pair in utf16
         p += utf8len;
     }

     SharedBuffer* buf = SharedBuffer::alloc((chars+1)*sizeof(char16_t));
     if (buf) {
         p = in;
         char16_t* str = (char16_t*)buf->data();
         char16_t* d = str;
         while (p < end) {
             size_t len = utf8_char_len(*p);
             uint32_t codepoint = utf8_to_utf32((const uint8_t*)p, len);

             // Convert the UTF32 codepoint to one or more UTF16 codepoints
             if (codepoint <= 0xFFFF) {
                 // Single UTF16 character
                 *d++ = (char16_t) codepoint;
             } else {
                 // Multiple UTF16 characters with surrogates
                 codepoint = codepoint - 0x10000;
                 *d++ = (char16_t) ((codepoint >> 10) + 0xD800);
                 *d++ = (char16_t) ((codepoint & 0x3FF) + 0xDC00);
             }

             p += len;
         }
         *d = 0;

         //printf("Created UTF-16 string from UTF-8 \"%s\":", in);
         //printHexData(1, str, buf->size(), 16, 1);
         //printf("\n");

         return str;
     }

     return getEmptyString();
 }

 // ---------------------------------------------------------------------------

 String16::String16()
     : mString(getEmptyString())
 {
 }

 String16::String16(const String16& o)
     : mString(o.mString)
 {
     SharedBuffer::bufferFromData(mString)->acquire();
 }

 String16::String16(const String16& o, size_t len, size_t begin)
     : mString(getEmptyString())
 {
     setTo(o, len, begin);
 }

 String16::String16(const char16_t* o)
 {
     size_t len = strlen16(o);
     SharedBuffer* buf = SharedBuffer::alloc((len+1)*sizeof(char16_t));
     LOG_ASSERT(buf, "Unable to allocate shared buffer");
     if (buf) {
         char16_t* str = (char16_t*)buf->data();
         strcpy16(str, o);
         mString = str;
         return;
     }

     mString = getEmptyString();
 }

 String16::String16(const char16_t* o, size_t len)
 {
     SharedBuffer* buf = SharedBuffer::alloc((len+1)*sizeof(char16_t));
     LOG_ASSERT(buf, "Unable to allocate shared buffer");
     if (buf) {
         char16_t* str = (char16_t*)buf->data();
         memcpy(str, o, len*sizeof(char16_t));
         str[len] = 0;
         mString = str;
         return;
     }

     mString = getEmptyString();
 }

 String16::String16(const String8& o)
     : mString(allocFromUTF8(o.string(), o.size()))
 {
 }

 String16::String16(const char* o)
     : mString(allocFromUTF8(o, strlen(o)))
 {
 }

 String16::String16(const char* o, size_t len)
     : mString(allocFromUTF8(o, len))
 {
 }

 String16::~String16()
 {
     SharedBuffer::bufferFromData(mString)->release();
 }

 void String16::setTo(const String16& other)
 {
     SharedBuffer::bufferFromData(other.mString)->acquire();
     SharedBuffer::bufferFromData(mString)->release();
     mString = other.mString;
 }

 status_t String16::setTo(const String16& other, size_t len, size_t begin)
 {
     const size_t N = other.size();
     if (begin >= N) {
         SharedBuffer::bufferFromData(mString)->release();
         mString = getEmptyString();
         return NO_ERROR;
     }
     if ((begin+len) > N) len = N-begin;
     if (begin == 0 && len == N) {
         setTo(other);
         return NO_ERROR;
     }

     if (&other == this) {
         LOG_ALWAYS_FATAL("Not implemented");
     }

     return setTo(other.string()+begin, len);
 }

 status_t String16::setTo(const char16_t* other)
 {
     return setTo(other, strlen16(other));
 }

 status_t String16::setTo(const char16_t* other, size_t len)
 {
     SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
         ->editResize((len+1)*sizeof(char16_t));
     if (buf) {
         char16_t* str = (char16_t*)buf->data();
         memmove(str, other, len*sizeof(char16_t));
         str[len] = 0;
         mString = str;
         return NO_ERROR;
     }
     return NO_MEMORY;
 }

 status_t String16::append(const String16& other)
 {
     const size_t myLen = size();
     const size_t otherLen = other.size();
     if (myLen == 0) {
         setTo(other);
         return NO_ERROR;
     } else if (otherLen == 0) {
         return NO_ERROR;
     }

     SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
         ->editResize((myLen+otherLen+1)*sizeof(char16_t));
     if (buf) {
         char16_t* str = (char16_t*)buf->data();
         memcpy(str+myLen, other, (otherLen+1)*sizeof(char16_t));
         mString = str;
         return NO_ERROR;
     }
     return NO_MEMORY;
 }

 status_t String16::append(const char16_t* chrs, size_t otherLen)
 {
     const size_t myLen = size();
     if (myLen == 0) {
         setTo(chrs, otherLen);
         return NO_ERROR;
     } else if (otherLen == 0) {
         return NO_ERROR;
     }

     SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
         ->editResize((myLen+otherLen+1)*sizeof(char16_t));
     if (buf) {
         char16_t* str = (char16_t*)buf->data();
         memcpy(str+myLen, chrs, otherLen*sizeof(char16_t));
         str[myLen+otherLen] = 0;
         mString = str;
         return NO_ERROR;
     }
     return NO_MEMORY;
 }

 status_t String16::insert(size_t pos, const char16_t* chrs)
 {
     return insert(pos, chrs, strlen16(chrs));
 }

 status_t String16::insert(size_t pos, const char16_t* chrs, size_t len)
 {
     const size_t myLen = size();
     if (myLen == 0) {
         return setTo(chrs, len);
         return NO_ERROR;
     } else if (len == 0) {
         return NO_ERROR;
     }

     if (pos > myLen) pos = myLen;

     #if 0
     printf("Insert in to %s: pos=%d, len=%d, myLen=%d, chrs=%s\n",
            String8(*this).string(), pos,
            len, myLen, String8(chrs, len).string());
     #endif

     SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
         ->editResize((myLen+len+1)*sizeof(char16_t));
     if (buf) {
         char16_t* str = (char16_t*)buf->data();
         if (pos < myLen) {
             memmove(str+pos+len, str+pos, (myLen-pos)*sizeof(char16_t));
         }
         memcpy(str+pos, chrs, len*sizeof(char16_t));
         str[myLen+len] = 0;
         mString = str;
         #if 0
         printf("Result (%d chrs): %s\n", size(), String8(*this).string());
         #endif
         return NO_ERROR;
     }
     return NO_MEMORY;
 }

 ssize_t String16::findFirst(char16_t c) const
 {
     const char16_t* str = string();
     const char16_t* p = str;
     const char16_t* e = p + size();
     while (p < e) {
         if (*p == c) {
             return p-str;
         }
         p++;
     }
     return -1;
 }

 ssize_t String16::findLast(char16_t c) const
 {
     const char16_t* str = string();
     const char16_t* p = str;
     const char16_t* e = p + size();
     while (p < e) {
         e--;
         if (*e == c) {
             return e-str;
         }
     }
     return -1;
 }

 bool String16::startsWith(const String16& prefix) const
 {
     const size_t ps = prefix.size();
     if (ps > size()) return false;
     return strzcmp16(mString, ps, prefix.string(), ps) == 0;
 }

 bool String16::startsWith(const char16_t* prefix) const
 {
     const size_t ps = strlen16(prefix);
     if (ps > size()) return false;
     return strncmp16(mString, prefix, ps) == 0;
 }

 status_t String16::makeLower()
 {
     const size_t N = size();
     const char16_t* str = string();
     char16_t* edit = NULL;
     for (size_t i=0; i<N; i++) {
         const char16_t v = str[i];
         if (v >= 'A' && v <= 'Z') {
             if (!edit) {
                 SharedBuffer* buf = SharedBuffer::bufferFromData(mString)->edit();
                 if (!buf) {
                     return NO_MEMORY;
                 }
                 edit = (char16_t*)buf->data();
                 mString = str = edit;
             }
             edit[i] = tolower((char)v);
         }
     }
     return NO_ERROR;
 }

 status_t String16::replaceAll(char16_t replaceThis, char16_t withThis)
 {
     const size_t N = size();
     const char16_t* str = string();
     char16_t* edit = NULL;
     for (size_t i=0; i<N; i++) {
         if (str[i] == replaceThis) {
             if (!edit) {
                 SharedBuffer* buf = SharedBuffer::bufferFromData(mString)->edit();
                 if (!buf) {
                     return NO_MEMORY;
                 }
                 edit = (char16_t*)buf->data();
                 mString = str = edit;
             }
             edit[i] = withThis;
         }
     }
     return NO_ERROR;
 }

 status_t String16::remove(size_t len, size_t begin)
 {
     const size_t N = size();
     if (begin >= N) {
         SharedBuffer::bufferFromData(mString)->release();
         mString = getEmptyString();
         return NO_ERROR;
     }
     if ((begin+len) > N) len = N-begin;
     if (begin == 0 && len == N) {
         return NO_ERROR;
     }

     if (begin > 0) {
         SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
             ->editResize((N+1)*sizeof(char16_t));
         if (!buf) {
             return NO_MEMORY;
         }
         char16_t* str = (char16_t*)buf->data();
         memmove(str, str+begin, (N-begin+1)*sizeof(char16_t));
         mString = str;
     }
     SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
         ->editResize((len+1)*sizeof(char16_t));
     if (buf) {
         char16_t* str = (char16_t*)buf->data();
         str[len] = 0;
         mString = str;
         return NO_ERROR;
     }
     return NO_MEMORY;
 }

 TextOutput& operator<<(TextOutput& to, const String16& val)
 {
     to << String8(val).string();
     return to;
 }

 }; // namespace android
	/*
	* Copyright (C) 2005 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include <utils/String16.h>

	#include <utils/Debug.h>
	#include <utils/Log.h>
	#include <utils/String8.h>
	#include <utils/TextOutput.h>
	#include <utils/threads.h>

	#include <private/utils/Static.h>

	#ifdef HAVE_WINSOCK
	# undef nhtol
	# undef htonl
	# undef nhtos
	# undef htons

	# ifdef HAVE_LITTLE_ENDIAN
	# define ntohl(x) ( ((x) << 24) \| (((x) >> 24) & 255) \| (((x) << 8) & 0xff0000) \| (((x) >> 8) & 0xff00) )
	# define htonl(x) ntohl(x)
	# define ntohs(x) ( (((x) << 8) & 0xff00) \| (((x) >> 8) & 255) )
	# define htons(x) ntohs(x)
	# else
	# define ntohl(x) (x)
	# define htonl(x) (x)
	# define ntohs(x) (x)
	# define htons(x) (x)
	# endif
	#else
	# include <netinet/in.h>
	#endif

	#include <memory.h>
	#include <stdio.h>
	#include <ctype.h>

	// ---------------------------------------------------------------------------

	int strcmp16(const char16_t s1, const char16_t s2)
	{
	char16_t ch;
	int d = 0;

	while ( 1 ) {
	d = (int)(ch = s1++) - (int)s2++;
	if ( d \|\| !ch )
	break;
	}

	return d;
	}

	int strncmp16(const char16_t s1, const char16_t s2, size_t n)
	{
	char16_t ch;
	int d = 0;

	while ( n-- ) {
	d = (int)(ch = s1++) - (int)s2++;
	if ( d \|\| !ch )
	break;
	}

	return d;
	}

	char16_t strcpy16(char16_t dst, const char16_t *src)
	{
	char16_t *q = dst;
	const char16_t *p = src;
	char16_t ch;

	do {
	q++ = ch = p++;
	} while ( ch );

	return dst;
	}

	size_t strlen16(const char16_t *s)
	{
	const char16_t *ss = s;
	while ( *ss )
	ss++;
	return ss-s;
	}


	char16_t strncpy16(char16_t dst, const char16_t *src, size_t n)
	{
	char16_t *q = dst;
	const char16_t *p = src;
	char ch;

	while (n) {
	n--;
	q++ = ch = p++;
	if ( !ch )
	break;
	}

	*q = 0;

	return dst;
	}

	size_t strnlen16(const char16_t *s, size_t maxlen)
	{
	const char16_t *ss = s;

	/* Important: the maxlen test must precede the reference through ss;
	since the byte beyond the maximum may segfault */
	while ((maxlen > 0) && *ss) {
	ss++;
	maxlen--;
	}
	return ss-s;
	}

	int strzcmp16(const char16_t s1, size_t n1, const char16_t s2, size_t n2)
	{
	const char16_t* e1 = s1+n1;
	const char16_t* e2 = s2+n2;

	while (s1 < e1 && s2 < e2) {
	const int d = (int)s1++ - (int)s2++;
	if (d) {
	return d;
	}
	}

	return n1 < n2
	? (0 - (int)*s2)
	: (n1 > n2
	? ((int)*s1 - 0)
	: 0);
	}

	int strzcmp16_h_n(const char16_t s1H, size_t n1, const char16_t s2N, size_t n2)
	{
	const char16_t* e1 = s1H+n1;
	const char16_t* e2 = s2N+n2;

	while (s1H < e1 && s2N < e2) {
	const char16_t c2 = ntohs(*s2N);
	const int d = (int)*s1H++ - (int)c2;
	s2N++;
	if (d) {
	return d;
	}
	}

	return n1 < n2
	? (0 - (int)ntohs(*s2N))
	: (n1 > n2
	? ((int)*s1H - 0)
	: 0);
	}

	// ---------------------------------------------------------------------------

	namespace android {

	static inline size_t
	utf8_char_len(uint8_t ch)
	{
	return ((0xe5000000 >> ((ch >> 3) & 0x1e)) & 3) + 1;
	}

	#define UTF8_SHIFT_AND_MASK(unicode, byte) (unicode)<<=6; (unicode) \|= (0x3f & (byte));

	static inline uint32_t
	utf8_to_utf32(const uint8_t *src, size_t length)
	{
	uint32_t unicode;

	switch (length)
	{
	case 1:
	return src[0];
	case 2:
	unicode = src[0] & 0x1f;
	UTF8_SHIFT_AND_MASK(unicode, src[1])
	return unicode;
	case 3:
	unicode = src[0] & 0x0f;
	UTF8_SHIFT_AND_MASK(unicode, src[1])
	UTF8_SHIFT_AND_MASK(unicode, src[2])
	return unicode;
	case 4:
	unicode = src[0] & 0x07;
	UTF8_SHIFT_AND_MASK(unicode, src[1])
	UTF8_SHIFT_AND_MASK(unicode, src[2])
	UTF8_SHIFT_AND_MASK(unicode, src[3])
	return unicode;
	default:
	return 0xffff;
	}

	//printf("Char at %p: len=%d, utf-16=%p\n", src, length, (void*)result);
	}

	// ---------------------------------------------------------------------------

	static SharedBuffer* gEmptyStringBuf = NULL;
	static char16_t* gEmptyString = NULL;

	static inline char16_t* getEmptyString()
	{
	gEmptyStringBuf->acquire();
	return gEmptyString;
	}

	void initialize_string16()
	{
	SharedBuffer* buf = SharedBuffer::alloc(sizeof(char16_t));
	char16_t* str = (char16_t*)buf->data();
	*str = 0;
	gEmptyStringBuf = buf;
	gEmptyString = str;
	}

	void terminate_string16()
	{
	SharedBuffer::bufferFromData(gEmptyString)->release();
	gEmptyStringBuf = NULL;
	gEmptyString = NULL;
	}

	// ---------------------------------------------------------------------------

	static char16_t* allocFromUTF8(const char* in, size_t len)
	{
	if (len == 0) return getEmptyString();

	size_t chars = 0;
	const char* end = in+len;
	const char* p = in;

	while (p < end) {
	chars++;
	int utf8len = utf8_char_len(*p);
	uint32_t codepoint = utf8_to_utf32((const uint8_t*)p, utf8len);
	if (codepoint > 0xFFFF) chars++; // this will be a surrogate pair in utf16
	p += utf8len;
	}

	SharedBuffer* buf = SharedBuffer::alloc((chars+1)*sizeof(char16_t));
	if (buf) {
	p = in;
	char16_t* str = (char16_t*)buf->data();
	char16_t* d = str;
	while (p < end) {
	size_t len = utf8_char_len(*p);
	uint32_t codepoint = utf8_to_utf32((const uint8_t*)p, len);

	// Convert the UTF32 codepoint to one or more UTF16 codepoints
	if (codepoint <= 0xFFFF) {
	// Single UTF16 character
	*d++ = (char16_t) codepoint;
	} else {
	// Multiple UTF16 characters with surrogates
	codepoint = codepoint - 0x10000;
	*d++ = (char16_t) ((codepoint >> 10) + 0xD800);
	*d++ = (char16_t) ((codepoint & 0x3FF) + 0xDC00);
	}

	p += len;
	}
	*d = 0;

	//printf("Created UTF-16 string from UTF-8 \"%s\":", in);
	//printHexData(1, str, buf->size(), 16, 1);
	//printf("\n");

	return str;
	}

	return getEmptyString();
	}

	// ---------------------------------------------------------------------------

	String16::String16()
	: mString(getEmptyString())
	{
	}

	String16::String16(const String16& o)
	: mString(o.mString)
	{
	SharedBuffer::bufferFromData(mString)->acquire();
	}

	String16::String16(const String16& o, size_t len, size_t begin)
	: mString(getEmptyString())
	{
	setTo(o, len, begin);
	}

	String16::String16(const char16_t* o)
	{
	size_t len = strlen16(o);
	SharedBuffer* buf = SharedBuffer::alloc((len+1)*sizeof(char16_t));
	LOG_ASSERT(buf, "Unable to allocate shared buffer");
	if (buf) {
	char16_t* str = (char16_t*)buf->data();
	strcpy16(str, o);
	mString = str;
	return;
	}

	mString = getEmptyString();
	}

	String16::String16(const char16_t* o, size_t len)
	{
	SharedBuffer* buf = SharedBuffer::alloc((len+1)*sizeof(char16_t));
	LOG_ASSERT(buf, "Unable to allocate shared buffer");
	if (buf) {
	char16_t* str = (char16_t*)buf->data();
	memcpy(str, o, len*sizeof(char16_t));
	str[len] = 0;
	mString = str;
	return;
	}

	mString = getEmptyString();
	}

	String16::String16(const String8& o)
	: mString(allocFromUTF8(o.string(), o.size()))
	{
	}

	String16::String16(const char* o)
	: mString(allocFromUTF8(o, strlen(o)))
	{
	}

	String16::String16(const char* o, size_t len)
	: mString(allocFromUTF8(o, len))
	{
	}

	String16::~String16()
	{
	SharedBuffer::bufferFromData(mString)->release();
	}

	void String16::setTo(const String16& other)
	{
	SharedBuffer::bufferFromData(other.mString)->acquire();
	SharedBuffer::bufferFromData(mString)->release();
	mString = other.mString;
	}

	status_t String16::setTo(const String16& other, size_t len, size_t begin)
	{
	const size_t N = other.size();
	if (begin >= N) {
	SharedBuffer::bufferFromData(mString)->release();
	mString = getEmptyString();
	return NO_ERROR;
	}
	if ((begin+len) > N) len = N-begin;
	if (begin == 0 && len == N) {
	setTo(other);
	return NO_ERROR;
	}

	if (&other == this) {
	LOG_ALWAYS_FATAL("Not implemented");
	}

	return setTo(other.string()+begin, len);
	}

	status_t String16::setTo(const char16_t* other)
	{
	return setTo(other, strlen16(other));
	}

	status_t String16::setTo(const char16_t* other, size_t len)
	{
	SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
	->editResize((len+1)*sizeof(char16_t));
	if (buf) {
	char16_t* str = (char16_t*)buf->data();
	memmove(str, other, len*sizeof(char16_t));
	str[len] = 0;
	mString = str;
	return NO_ERROR;
	}
	return NO_MEMORY;
	}

	status_t String16::append(const String16& other)
	{
	const size_t myLen = size();
	const size_t otherLen = other.size();
	if (myLen == 0) {
	setTo(other);
	return NO_ERROR;
	} else if (otherLen == 0) {
	return NO_ERROR;
	}

	SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
	->editResize((myLen+otherLen+1)*sizeof(char16_t));
	if (buf) {
	char16_t* str = (char16_t*)buf->data();
	memcpy(str+myLen, other, (otherLen+1)*sizeof(char16_t));
	mString = str;
	return NO_ERROR;
	}
	return NO_MEMORY;
	}

	status_t String16::append(const char16_t* chrs, size_t otherLen)
	{
	const size_t myLen = size();
	if (myLen == 0) {
	setTo(chrs, otherLen);
	return NO_ERROR;
	} else if (otherLen == 0) {
	return NO_ERROR;
	}

	SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
	->editResize((myLen+otherLen+1)*sizeof(char16_t));
	if (buf) {
	char16_t* str = (char16_t*)buf->data();
	memcpy(str+myLen, chrs, otherLen*sizeof(char16_t));
	str[myLen+otherLen] = 0;
	mString = str;
	return NO_ERROR;
	}
	return NO_MEMORY;
	}

	status_t String16::insert(size_t pos, const char16_t* chrs)
	{
	return insert(pos, chrs, strlen16(chrs));
	}

	status_t String16::insert(size_t pos, const char16_t* chrs, size_t len)
	{
	const size_t myLen = size();
	if (myLen == 0) {
	return setTo(chrs, len);
	return NO_ERROR;
	} else if (len == 0) {
	return NO_ERROR;
	}

	if (pos > myLen) pos = myLen;

	#if 0
	printf("Insert in to %s: pos=%d, len=%d, myLen=%d, chrs=%s\n",
	String8(*this).string(), pos,
	len, myLen, String8(chrs, len).string());
	#endif

	SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
	->editResize((myLen+len+1)*sizeof(char16_t));
	if (buf) {
	char16_t* str = (char16_t*)buf->data();
	if (pos < myLen) {
	memmove(str+pos+len, str+pos, (myLen-pos)*sizeof(char16_t));
	}
	memcpy(str+pos, chrs, len*sizeof(char16_t));
	str[myLen+len] = 0;
	mString = str;
	#if 0
	printf("Result (%d chrs): %s\n", size(), String8(*this).string());
	#endif
	return NO_ERROR;
	}
	return NO_MEMORY;
	}

	ssize_t String16::findFirst(char16_t c) const
	{
	const char16_t* str = string();
	const char16_t* p = str;
	const char16_t* e = p + size();
	while (p < e) {
	if (*p == c) {
	return p-str;
	}
	p++;
	}
	return -1;
	}

	ssize_t String16::findLast(char16_t c) const
	{
	const char16_t* str = string();
	const char16_t* p = str;
	const char16_t* e = p + size();
	while (p < e) {
	e--;
	if (*e == c) {
	return e-str;
	}
	}
	return -1;
	}

	bool String16::startsWith(const String16& prefix) const
	{
	const size_t ps = prefix.size();
	if (ps > size()) return false;
	return strzcmp16(mString, ps, prefix.string(), ps) == 0;
	}

	bool String16::startsWith(const char16_t* prefix) const
	{
	const size_t ps = strlen16(prefix);
	if (ps > size()) return false;
	return strncmp16(mString, prefix, ps) == 0;
	}

	status_t String16::makeLower()
	{
	const size_t N = size();
	const char16_t* str = string();
	char16_t* edit = NULL;
	for (size_t i=0; i<N; i++) {
	const char16_t v = str[i];
	if (v >= 'A' && v <= 'Z') {
	if (!edit) {
	SharedBuffer* buf = SharedBuffer::bufferFromData(mString)->edit();
	if (!buf) {
	return NO_MEMORY;
	}
	edit = (char16_t*)buf->data();
	mString = str = edit;
	}
	edit[i] = tolower((char)v);
	}
	}
	return NO_ERROR;
	}

	status_t String16::replaceAll(char16_t replaceThis, char16_t withThis)
	{
	const size_t N = size();
	const char16_t* str = string();
	char16_t* edit = NULL;
	for (size_t i=0; i<N; i++) {
	if (str[i] == replaceThis) {
	if (!edit) {
	SharedBuffer* buf = SharedBuffer::bufferFromData(mString)->edit();
	if (!buf) {
	return NO_MEMORY;
	}
	edit = (char16_t*)buf->data();
	mString = str = edit;
	}
	edit[i] = withThis;
	}
	}
	return NO_ERROR;
	}

	status_t String16::remove(size_t len, size_t begin)
	{
	const size_t N = size();
	if (begin >= N) {
	SharedBuffer::bufferFromData(mString)->release();
	mString = getEmptyString();
	return NO_ERROR;
	}
	if ((begin+len) > N) len = N-begin;
	if (begin == 0 && len == N) {
	return NO_ERROR;
	}

	if (begin > 0) {
	SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
	->editResize((N+1)*sizeof(char16_t));
	if (!buf) {
	return NO_MEMORY;
	}
	char16_t* str = (char16_t*)buf->data();
	memmove(str, str+begin, (N-begin+1)*sizeof(char16_t));
	mString = str;
	}
	SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
	->editResize((len+1)*sizeof(char16_t));
	if (buf) {
	char16_t* str = (char16_t*)buf->data();
	str[len] = 0;
	mString = str;
	return NO_ERROR;
	}
	return NO_MEMORY;
	}

	TextOutput& operator<<(TextOutput& to, const String16& val)
	{
	to << String8(val).string();
	return to;
	}

	}; // namespace android