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platform_system_core/libs/utils/String16.cpp
The Android Open Source Project ae31e705de auto import from //branches/cupcake/...@137873
2013-07-30 13:56:49 -07:00

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/*
* 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
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