941 lines
22 KiB
C++
941 lines
22 KiB
C++
/*
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* Copyright (C) 2005 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <utils/String8.h>
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#include <utils/Log.h>
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#include <utils/String16.h>
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#include <utils/TextOutput.h>
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#include <utils/threads.h>
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#include <private/utils/Static.h>
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#include <ctype.h>
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/*
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* Functions outside android is below the namespace android, since they use
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* functions and constants in android namespace.
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*/
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// ---------------------------------------------------------------------------
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namespace android {
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static const char32_t kByteMask = 0x000000BF;
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static const char32_t kByteMark = 0x00000080;
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// Surrogates aren't valid for UTF-32 characters, so define some
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// constants that will let us screen them out.
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static const char32_t kUnicodeSurrogateHighStart = 0x0000D800;
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static const char32_t kUnicodeSurrogateHighEnd = 0x0000DBFF;
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static const char32_t kUnicodeSurrogateLowStart = 0x0000DC00;
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static const char32_t kUnicodeSurrogateLowEnd = 0x0000DFFF;
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static const char32_t kUnicodeSurrogateStart = kUnicodeSurrogateHighStart;
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static const char32_t kUnicodeSurrogateEnd = kUnicodeSurrogateLowEnd;
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static const char32_t kUnicodeMaxCodepoint = 0x0010FFFF;
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// Mask used to set appropriate bits in first byte of UTF-8 sequence,
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// indexed by number of bytes in the sequence.
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// 0xxxxxxx
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// -> (00-7f) 7bit. Bit mask for the first byte is 0x00000000
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// 110yyyyx 10xxxxxx
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// -> (c0-df)(80-bf) 11bit. Bit mask is 0x000000C0
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// 1110yyyy 10yxxxxx 10xxxxxx
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// -> (e0-ef)(80-bf)(80-bf) 16bit. Bit mask is 0x000000E0
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// 11110yyy 10yyxxxx 10xxxxxx 10xxxxxx
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// -> (f0-f7)(80-bf)(80-bf)(80-bf) 21bit. Bit mask is 0x000000F0
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static const char32_t kFirstByteMark[] = {
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0x00000000, 0x00000000, 0x000000C0, 0x000000E0, 0x000000F0
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};
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// Separator used by resource paths. This is not platform dependent contrary
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// to OS_PATH_SEPARATOR.
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#define RES_PATH_SEPARATOR '/'
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// Return number of utf8 bytes required for the character.
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static size_t utf32_to_utf8_bytes(char32_t srcChar)
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{
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size_t bytesToWrite;
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// Figure out how many bytes the result will require.
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if (srcChar < 0x00000080)
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{
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bytesToWrite = 1;
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}
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else if (srcChar < 0x00000800)
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{
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bytesToWrite = 2;
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}
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else if (srcChar < 0x00010000)
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{
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if ((srcChar < kUnicodeSurrogateStart)
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|| (srcChar > kUnicodeSurrogateEnd))
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{
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bytesToWrite = 3;
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}
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else
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{
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// Surrogates are invalid UTF-32 characters.
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return 0;
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}
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}
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// Max code point for Unicode is 0x0010FFFF.
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else if (srcChar <= kUnicodeMaxCodepoint)
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{
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bytesToWrite = 4;
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}
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else
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{
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// Invalid UTF-32 character.
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return 0;
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}
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return bytesToWrite;
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}
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// Write out the source character to <dstP>.
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static void utf32_to_utf8(uint8_t* dstP, char32_t srcChar, size_t bytes)
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{
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dstP += bytes;
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switch (bytes)
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{ /* note: everything falls through. */
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case 4: *--dstP = (uint8_t)((srcChar | kByteMark) & kByteMask); srcChar >>= 6;
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case 3: *--dstP = (uint8_t)((srcChar | kByteMark) & kByteMask); srcChar >>= 6;
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case 2: *--dstP = (uint8_t)((srcChar | kByteMark) & kByteMask); srcChar >>= 6;
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case 1: *--dstP = (uint8_t)(srcChar | kFirstByteMark[bytes]);
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}
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}
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// ---------------------------------------------------------------------------
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static SharedBuffer* gEmptyStringBuf = NULL;
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static char* gEmptyString = NULL;
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extern int gDarwinCantLoadAllObjects;
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int gDarwinIsReallyAnnoying;
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static inline char* getEmptyString()
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{
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gEmptyStringBuf->acquire();
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return gEmptyString;
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}
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void initialize_string8()
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{
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// HACK: This dummy dependency forces linking libutils Static.cpp,
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// which is needed to initialize String8/String16 classes.
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// These variables are named for Darwin, but are needed elsewhere too,
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// including static linking on any platform.
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gDarwinIsReallyAnnoying = gDarwinCantLoadAllObjects;
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SharedBuffer* buf = SharedBuffer::alloc(1);
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char* str = (char*)buf->data();
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*str = 0;
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gEmptyStringBuf = buf;
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gEmptyString = str;
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}
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void terminate_string8()
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{
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SharedBuffer::bufferFromData(gEmptyString)->release();
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gEmptyStringBuf = NULL;
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gEmptyString = NULL;
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}
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// ---------------------------------------------------------------------------
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static char* allocFromUTF8(const char* in, size_t len)
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{
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if (len > 0) {
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SharedBuffer* buf = SharedBuffer::alloc(len+1);
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LOG_ASSERT(buf, "Unable to allocate shared buffer");
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if (buf) {
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char* str = (char*)buf->data();
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memcpy(str, in, len);
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str[len] = 0;
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return str;
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}
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return NULL;
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}
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return getEmptyString();
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}
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template<typename T, typename L>
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static char* allocFromUTF16OrUTF32(const T* in, L len)
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{
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if (len == 0) return getEmptyString();
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size_t bytes = 0;
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const T* end = in+len;
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const T* p = in;
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while (p < end) {
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bytes += utf32_to_utf8_bytes(*p);
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p++;
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}
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SharedBuffer* buf = SharedBuffer::alloc(bytes+1);
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LOG_ASSERT(buf, "Unable to allocate shared buffer");
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if (buf) {
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p = in;
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char* str = (char*)buf->data();
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char* d = str;
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while (p < end) {
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const T c = *p++;
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size_t len = utf32_to_utf8_bytes(c);
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utf32_to_utf8((uint8_t*)d, c, len);
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d += len;
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}
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*d = 0;
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return str;
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}
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return getEmptyString();
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}
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static char* allocFromUTF16(const char16_t* in, size_t len)
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{
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if (len == 0) return getEmptyString();
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const size_t bytes = utf8_length_from_utf16(in, len);
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SharedBuffer* buf = SharedBuffer::alloc(bytes+1);
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LOG_ASSERT(buf, "Unable to allocate shared buffer");
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if (buf) {
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char* str = (char*)buf->data();
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utf16_to_utf8(in, len, str, bytes+1);
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return str;
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}
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return getEmptyString();
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}
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static char* allocFromUTF32(const char32_t* in, size_t len)
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{
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return allocFromUTF16OrUTF32<char32_t, size_t>(in, len);
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}
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// ---------------------------------------------------------------------------
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String8::String8()
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: mString(getEmptyString())
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{
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}
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String8::String8(const String8& o)
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: mString(o.mString)
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{
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SharedBuffer::bufferFromData(mString)->acquire();
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}
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String8::String8(const char* o)
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: mString(allocFromUTF8(o, strlen(o)))
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{
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if (mString == NULL) {
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mString = getEmptyString();
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}
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}
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String8::String8(const char* o, size_t len)
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: mString(allocFromUTF8(o, len))
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{
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if (mString == NULL) {
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mString = getEmptyString();
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}
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}
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String8::String8(const String16& o)
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: mString(allocFromUTF16(o.string(), o.size()))
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{
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}
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String8::String8(const char16_t* o)
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: mString(allocFromUTF16(o, strlen16(o)))
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{
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}
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String8::String8(const char16_t* o, size_t len)
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: mString(allocFromUTF16(o, len))
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{
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}
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String8::String8(const char32_t* o)
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: mString(allocFromUTF32(o, strlen32(o)))
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{
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}
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String8::String8(const char32_t* o, size_t len)
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: mString(allocFromUTF32(o, len))
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{
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}
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String8::~String8()
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{
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SharedBuffer::bufferFromData(mString)->release();
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}
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void String8::setTo(const String8& other)
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{
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SharedBuffer::bufferFromData(other.mString)->acquire();
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SharedBuffer::bufferFromData(mString)->release();
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mString = other.mString;
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}
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status_t String8::setTo(const char* other)
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{
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const char *newString = allocFromUTF8(other, strlen(other));
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SharedBuffer::bufferFromData(mString)->release();
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mString = newString;
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if (mString) return NO_ERROR;
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mString = getEmptyString();
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return NO_MEMORY;
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}
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status_t String8::setTo(const char* other, size_t len)
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{
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const char *newString = allocFromUTF8(other, len);
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SharedBuffer::bufferFromData(mString)->release();
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mString = newString;
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if (mString) return NO_ERROR;
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mString = getEmptyString();
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return NO_MEMORY;
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}
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status_t String8::setTo(const char16_t* other, size_t len)
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{
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const char *newString = allocFromUTF16(other, len);
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SharedBuffer::bufferFromData(mString)->release();
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mString = newString;
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if (mString) return NO_ERROR;
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mString = getEmptyString();
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return NO_MEMORY;
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}
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status_t String8::setTo(const char32_t* other, size_t len)
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{
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const char *newString = allocFromUTF32(other, len);
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SharedBuffer::bufferFromData(mString)->release();
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mString = newString;
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if (mString) return NO_ERROR;
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mString = getEmptyString();
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return NO_MEMORY;
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}
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status_t String8::append(const String8& other)
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{
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const size_t otherLen = other.bytes();
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if (bytes() == 0) {
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setTo(other);
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return NO_ERROR;
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} else if (otherLen == 0) {
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return NO_ERROR;
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}
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return real_append(other.string(), otherLen);
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}
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status_t String8::append(const char* other)
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{
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return append(other, strlen(other));
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}
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status_t String8::append(const char* other, size_t otherLen)
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{
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if (bytes() == 0) {
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return setTo(other, otherLen);
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} else if (otherLen == 0) {
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return NO_ERROR;
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}
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return real_append(other, otherLen);
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}
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status_t String8::appendFormat(const char* fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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int result = NO_ERROR;
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int n = vsnprintf(NULL, 0, fmt, ap);
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if (n != 0) {
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size_t oldLength = length();
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char* buf = lockBuffer(oldLength + n);
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if (buf) {
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vsnprintf(buf + oldLength, n + 1, fmt, ap);
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} else {
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result = NO_MEMORY;
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}
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}
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va_end(ap);
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return result;
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}
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status_t String8::real_append(const char* other, size_t otherLen)
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{
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const size_t myLen = bytes();
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SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
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->editResize(myLen+otherLen+1);
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if (buf) {
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char* str = (char*)buf->data();
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mString = str;
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str += myLen;
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memcpy(str, other, otherLen);
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str[otherLen] = '\0';
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return NO_ERROR;
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}
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return NO_MEMORY;
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}
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char* String8::lockBuffer(size_t size)
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{
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SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
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->editResize(size+1);
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if (buf) {
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char* str = (char*)buf->data();
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mString = str;
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return str;
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}
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return NULL;
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}
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void String8::unlockBuffer()
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{
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unlockBuffer(strlen(mString));
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}
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status_t String8::unlockBuffer(size_t size)
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{
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if (size != this->size()) {
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SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
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->editResize(size+1);
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if (! buf) {
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return NO_MEMORY;
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}
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char* str = (char*)buf->data();
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str[size] = 0;
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mString = str;
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}
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return NO_ERROR;
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}
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ssize_t String8::find(const char* other, size_t start) const
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{
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size_t len = size();
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if (start >= len) {
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return -1;
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}
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const char* s = mString+start;
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const char* p = strstr(s, other);
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return p ? p-mString : -1;
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}
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void String8::toLower()
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{
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toLower(0, size());
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}
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void String8::toLower(size_t start, size_t length)
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{
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const size_t len = size();
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if (start >= len) {
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return;
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}
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if (start+length > len) {
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length = len-start;
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}
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char* buf = lockBuffer(len);
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buf += start;
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while (length > 0) {
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*buf = tolower(*buf);
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buf++;
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length--;
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}
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unlockBuffer(len);
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}
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void String8::toUpper()
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{
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toUpper(0, size());
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}
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void String8::toUpper(size_t start, size_t length)
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{
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const size_t len = size();
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if (start >= len) {
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return;
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}
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if (start+length > len) {
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length = len-start;
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}
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char* buf = lockBuffer(len);
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buf += start;
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while (length > 0) {
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*buf = toupper(*buf);
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buf++;
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length--;
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}
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unlockBuffer(len);
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}
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size_t String8::getUtf32Length() const
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{
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return utf32_length(mString, length());
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}
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int32_t String8::getUtf32At(size_t index, size_t *next_index) const
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{
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return utf32_at(mString, length(), index, next_index);
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}
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size_t String8::getUtf32(char32_t* dst, size_t dst_len) const
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{
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return utf8_to_utf32(mString, length(), dst, dst_len);
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}
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TextOutput& operator<<(TextOutput& to, const String8& val)
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{
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to << val.string();
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return to;
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}
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|
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// ---------------------------------------------------------------------------
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// Path functions
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void String8::setPathName(const char* name)
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{
|
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setPathName(name, strlen(name));
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}
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void String8::setPathName(const char* name, size_t len)
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{
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char* buf = lockBuffer(len);
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memcpy(buf, name, len);
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// remove trailing path separator, if present
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if (len > 0 && buf[len-1] == OS_PATH_SEPARATOR)
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len--;
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buf[len] = '\0';
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|
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unlockBuffer(len);
|
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}
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String8 String8::getPathLeaf(void) const
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{
|
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const char* cp;
|
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const char*const buf = mString;
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cp = strrchr(buf, OS_PATH_SEPARATOR);
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if (cp == NULL)
|
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return String8(*this);
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else
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return String8(cp+1);
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}
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String8 String8::getPathDir(void) const
|
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{
|
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const char* cp;
|
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const char*const str = mString;
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|
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cp = strrchr(str, OS_PATH_SEPARATOR);
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if (cp == NULL)
|
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return String8("");
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else
|
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return String8(str, cp - str);
|
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}
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|
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String8 String8::walkPath(String8* outRemains) const
|
|
{
|
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const char* cp;
|
|
const char*const str = mString;
|
|
const char* buf = str;
|
|
|
|
cp = strchr(buf, OS_PATH_SEPARATOR);
|
|
if (cp == buf) {
|
|
// don't include a leading '/'.
|
|
buf = buf+1;
|
|
cp = strchr(buf, OS_PATH_SEPARATOR);
|
|
}
|
|
|
|
if (cp == NULL) {
|
|
String8 res = buf != str ? String8(buf) : *this;
|
|
if (outRemains) *outRemains = String8("");
|
|
return res;
|
|
}
|
|
|
|
String8 res(buf, cp-buf);
|
|
if (outRemains) *outRemains = String8(cp+1);
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* Helper function for finding the start of an extension in a pathname.
|
|
*
|
|
* Returns a pointer inside mString, or NULL if no extension was found.
|
|
*/
|
|
char* String8::find_extension(void) const
|
|
{
|
|
const char* lastSlash;
|
|
const char* lastDot;
|
|
int extLen;
|
|
const char* const str = mString;
|
|
|
|
// only look at the filename
|
|
lastSlash = strrchr(str, OS_PATH_SEPARATOR);
|
|
if (lastSlash == NULL)
|
|
lastSlash = str;
|
|
else
|
|
lastSlash++;
|
|
|
|
// find the last dot
|
|
lastDot = strrchr(lastSlash, '.');
|
|
if (lastDot == NULL)
|
|
return NULL;
|
|
|
|
// looks good, ship it
|
|
return const_cast<char*>(lastDot);
|
|
}
|
|
|
|
String8 String8::getPathExtension(void) const
|
|
{
|
|
char* ext;
|
|
|
|
ext = find_extension();
|
|
if (ext != NULL)
|
|
return String8(ext);
|
|
else
|
|
return String8("");
|
|
}
|
|
|
|
String8 String8::getBasePath(void) const
|
|
{
|
|
char* ext;
|
|
const char* const str = mString;
|
|
|
|
ext = find_extension();
|
|
if (ext == NULL)
|
|
return String8(*this);
|
|
else
|
|
return String8(str, ext - str);
|
|
}
|
|
|
|
String8& String8::appendPath(const char* name)
|
|
{
|
|
// TODO: The test below will fail for Win32 paths. Fix later or ignore.
|
|
if (name[0] != OS_PATH_SEPARATOR) {
|
|
if (*name == '\0') {
|
|
// nothing to do
|
|
return *this;
|
|
}
|
|
|
|
size_t len = length();
|
|
if (len == 0) {
|
|
// no existing filename, just use the new one
|
|
setPathName(name);
|
|
return *this;
|
|
}
|
|
|
|
// make room for oldPath + '/' + newPath
|
|
int newlen = strlen(name);
|
|
|
|
char* buf = lockBuffer(len+1+newlen);
|
|
|
|
// insert a '/' if needed
|
|
if (buf[len-1] != OS_PATH_SEPARATOR)
|
|
buf[len++] = OS_PATH_SEPARATOR;
|
|
|
|
memcpy(buf+len, name, newlen+1);
|
|
len += newlen;
|
|
|
|
unlockBuffer(len);
|
|
|
|
return *this;
|
|
} else {
|
|
setPathName(name);
|
|
return *this;
|
|
}
|
|
}
|
|
|
|
String8& String8::convertToResPath()
|
|
{
|
|
#if OS_PATH_SEPARATOR != RES_PATH_SEPARATOR
|
|
size_t len = length();
|
|
if (len > 0) {
|
|
char * buf = lockBuffer(len);
|
|
for (char * end = buf + len; buf < end; ++buf) {
|
|
if (*buf == OS_PATH_SEPARATOR)
|
|
*buf = RES_PATH_SEPARATOR;
|
|
}
|
|
unlockBuffer(len);
|
|
}
|
|
#endif
|
|
return *this;
|
|
}
|
|
|
|
}; // namespace android
|
|
|
|
// ---------------------------------------------------------------------------
|
|
|
|
size_t strlen32(const char32_t *s)
|
|
{
|
|
const char32_t *ss = s;
|
|
while ( *ss )
|
|
ss++;
|
|
return ss-s;
|
|
}
|
|
|
|
size_t strnlen32(const char32_t *s, size_t maxlen)
|
|
{
|
|
const char32_t *ss = s;
|
|
while ((maxlen > 0) && *ss) {
|
|
ss++;
|
|
maxlen--;
|
|
}
|
|
return ss-s;
|
|
}
|
|
|
|
size_t utf8_length(const char *src)
|
|
{
|
|
const char *cur = src;
|
|
size_t ret = 0;
|
|
while (*cur != '\0') {
|
|
const char first_char = *cur++;
|
|
if ((first_char & 0x80) == 0) { // ASCII
|
|
ret += 1;
|
|
continue;
|
|
}
|
|
// (UTF-8's character must not be like 10xxxxxx,
|
|
// but 110xxxxx, 1110xxxx, ... or 1111110x)
|
|
if ((first_char & 0x40) == 0) {
|
|
return 0;
|
|
}
|
|
|
|
int32_t mask, to_ignore_mask;
|
|
size_t num_to_read = 0;
|
|
char32_t utf32 = 0;
|
|
for (num_to_read = 1, mask = 0x40, to_ignore_mask = 0x80;
|
|
num_to_read < 5 && (first_char & mask);
|
|
num_to_read++, to_ignore_mask |= mask, mask >>= 1) {
|
|
if ((*cur & 0xC0) != 0x80) { // must be 10xxxxxx
|
|
return 0;
|
|
}
|
|
// 0x3F == 00111111
|
|
utf32 = (utf32 << 6) + (*cur++ & 0x3F);
|
|
}
|
|
// "first_char" must be (110xxxxx - 11110xxx)
|
|
if (num_to_read == 5) {
|
|
return 0;
|
|
}
|
|
to_ignore_mask |= mask;
|
|
utf32 |= ((~to_ignore_mask) & first_char) << (6 * (num_to_read - 1));
|
|
if (utf32 > android::kUnicodeMaxCodepoint) {
|
|
return 0;
|
|
}
|
|
|
|
ret += num_to_read;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
size_t utf32_length(const char *src, size_t src_len)
|
|
{
|
|
if (src == NULL || src_len == 0) {
|
|
return 0;
|
|
}
|
|
size_t ret = 0;
|
|
const char* cur;
|
|
const char* end;
|
|
size_t num_to_skip;
|
|
for (cur = src, end = src + src_len, num_to_skip = 1;
|
|
cur < end;
|
|
cur += num_to_skip, ret++) {
|
|
const char first_char = *cur;
|
|
num_to_skip = 1;
|
|
if ((first_char & 0x80) == 0) { // ASCII
|
|
continue;
|
|
}
|
|
int32_t mask;
|
|
|
|
for (mask = 0x40; (first_char & mask); num_to_skip++, mask >>= 1) {
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
size_t utf8_length_from_utf32(const char32_t *src, size_t src_len)
|
|
{
|
|
if (src == NULL || src_len == 0) {
|
|
return 0;
|
|
}
|
|
size_t ret = 0;
|
|
const char32_t *end = src + src_len;
|
|
while (src < end) {
|
|
ret += android::utf32_to_utf8_bytes(*src++);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
size_t utf8_length_from_utf16(const char16_t *src, size_t src_len)
|
|
{
|
|
if (src == NULL || src_len == 0) {
|
|
return 0;
|
|
}
|
|
size_t ret = 0;
|
|
const char16_t* const end = src + src_len;
|
|
while (src < end) {
|
|
if ((*src & 0xFC00) == 0xD800 && (src + 1) < end
|
|
&& (*++src & 0xFC00) == 0xDC00) {
|
|
// surrogate pairs are always 4 bytes.
|
|
ret += 4;
|
|
src++;
|
|
} else {
|
|
ret += android::utf32_to_utf8_bytes((char32_t) *src++);
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int32_t utf32_at_internal(const char* cur, size_t *num_read)
|
|
{
|
|
const char first_char = *cur;
|
|
if ((first_char & 0x80) == 0) { // ASCII
|
|
*num_read = 1;
|
|
return *cur;
|
|
}
|
|
cur++;
|
|
char32_t mask, to_ignore_mask;
|
|
size_t num_to_read = 0;
|
|
char32_t utf32 = first_char;
|
|
for (num_to_read = 1, mask = 0x40, to_ignore_mask = 0xFFFFFF80;
|
|
(first_char & mask);
|
|
num_to_read++, to_ignore_mask |= mask, mask >>= 1) {
|
|
// 0x3F == 00111111
|
|
utf32 = (utf32 << 6) + (*cur++ & 0x3F);
|
|
}
|
|
to_ignore_mask |= mask;
|
|
utf32 &= ~(to_ignore_mask << (6 * (num_to_read - 1)));
|
|
|
|
*num_read = num_to_read;
|
|
return static_cast<int32_t>(utf32);
|
|
}
|
|
|
|
int32_t utf32_at(const char *src, size_t src_len,
|
|
size_t index, size_t *next_index)
|
|
{
|
|
if (index >= src_len) {
|
|
return -1;
|
|
}
|
|
size_t dummy_index;
|
|
if (next_index == NULL) {
|
|
next_index = &dummy_index;
|
|
}
|
|
size_t num_read;
|
|
int32_t ret = utf32_at_internal(src + index, &num_read);
|
|
if (ret >= 0) {
|
|
*next_index = index + num_read;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
size_t utf8_to_utf32(const char* src, size_t src_len,
|
|
char32_t* dst, size_t dst_len)
|
|
{
|
|
if (src == NULL || src_len == 0 || dst == NULL || dst_len == 0) {
|
|
return 0;
|
|
}
|
|
|
|
const char* cur = src;
|
|
const char* end = src + src_len;
|
|
char32_t* cur_utf32 = dst;
|
|
const char32_t* end_utf32 = dst + dst_len;
|
|
while (cur_utf32 < end_utf32 && cur < end) {
|
|
size_t num_read;
|
|
*cur_utf32++ =
|
|
static_cast<char32_t>(utf32_at_internal(cur, &num_read));
|
|
cur += num_read;
|
|
}
|
|
if (cur_utf32 < end_utf32) {
|
|
*cur_utf32 = 0;
|
|
}
|
|
return static_cast<size_t>(cur_utf32 - dst);
|
|
}
|
|
|
|
size_t utf32_to_utf8(const char32_t* src, size_t src_len,
|
|
char* dst, size_t dst_len)
|
|
{
|
|
if (src == NULL || src_len == 0 || dst == NULL || dst_len == 0) {
|
|
return 0;
|
|
}
|
|
const char32_t *cur_utf32 = src;
|
|
const char32_t *end_utf32 = src + src_len;
|
|
char *cur = dst;
|
|
const char *end = dst + dst_len;
|
|
while (cur_utf32 < end_utf32 && cur < end) {
|
|
size_t len = android::utf32_to_utf8_bytes(*cur_utf32);
|
|
android::utf32_to_utf8((uint8_t *)cur, *cur_utf32++, len);
|
|
cur += len;
|
|
}
|
|
if (cur < end) {
|
|
*cur = '\0';
|
|
}
|
|
return cur - dst;
|
|
}
|
|
|
|
size_t utf16_to_utf8(const char16_t* src, size_t src_len,
|
|
char* dst, size_t dst_len)
|
|
{
|
|
if (src == NULL || src_len == 0 || dst == NULL || dst_len == 0) {
|
|
return 0;
|
|
}
|
|
const char16_t* cur_utf16 = src;
|
|
const char16_t* const end_utf16 = src + src_len;
|
|
char *cur = dst;
|
|
const char* const end = dst + dst_len;
|
|
while (cur_utf16 < end_utf16 && cur < end) {
|
|
char32_t utf32;
|
|
// surrogate pairs
|
|
if ((*cur_utf16 & 0xFC00) == 0xD800 && (cur_utf16 + 1) < end_utf16) {
|
|
utf32 = (*cur_utf16++ - 0xD800) << 10;
|
|
utf32 |= *cur_utf16++ - 0xDC00;
|
|
utf32 += 0x10000;
|
|
} else {
|
|
utf32 = (char32_t) *cur_utf16++;
|
|
}
|
|
size_t len = android::utf32_to_utf8_bytes(utf32);
|
|
android::utf32_to_utf8((uint8_t*)cur, utf32, len);
|
|
cur += len;
|
|
}
|
|
if (cur < end) {
|
|
*cur = '\0';
|
|
}
|
|
return cur - dst;
|
|
}
|