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// text.cpp
/* Copyright 2009 10gen Inc.
*
* 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 "pch.h"
#include "mongo/util/text.h"
#include "mongo/util/unittest.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
inline int leadingOnes(unsigned char c) {
if (c < 0x80) return 0;
static const char _leadingOnes[128] = {
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x80 - 0x8F
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x90 - 0x99
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0xA0 - 0xA9
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0xB0 - 0xB9
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // 0xC0 - 0xC9
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // 0xD0 - 0xD9
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, // 0xE0 - 0xE9
4, 4, 4, 4, 4, 4, 4, 4, // 0xF0 - 0xF7
5, 5, 5, 5, // 0xF8 - 0xFB
6, 6, // 0xFC - 0xFD
7, // 0xFE
8, // 0xFF
};
return _leadingOnes[c & 0x7f];
}
bool isValidUTF8(const char *s) {
int left = 0; // how many bytes are left in the current codepoint
while (*s) {
const unsigned char c = (unsigned char) *(s++);
const int ones = leadingOnes(c);
if (left) {
if (ones != 1) return false; // should be a continuation byte
left--;
}
else {
if (ones == 0) continue; // ASCII byte
if (ones == 1) return false; // unexpected continuation byte
if (c > 0xF4) return false; // codepoint too large (< 0x10FFFF)
if (c == 0xC0 || c == 0xC1) return false; // codepoints <= 0x7F shouldn't be 2 bytes
// still valid
left = ones-1;
}
}
if (left!=0) return false; // string ended mid-codepoint
return true;
}
#if defined(_WIN32)
std::string toUtf8String(const std::wstring& wide) {
if (wide.size() > boost::integer_traits<int>::const_max)
throw std::length_error(
"Wide string cannot be more than INT_MAX characters long.");
if (wide.size() == 0)
return "";
// Calculate necessary buffer size
int len = ::WideCharToMultiByte(
CP_UTF8, 0, wide.c_str(), static_cast<int>(wide.size()),
NULL, 0, NULL, NULL);
// Perform actual conversion
if (len > 0) {
std::vector<char> buffer(len);
len = ::WideCharToMultiByte(
CP_UTF8, 0, wide.c_str(), static_cast<int>(wide.size()),
&buffer[0], static_cast<int>(buffer.size()), NULL, NULL);
if (len > 0) {
assert(len == static_cast<int>(buffer.size()));
return std::string(&buffer[0], buffer.size());
}
}
msgasserted( 16091 ,
mongoutils::str::stream() << "can't wstring to utf8: " << ::GetLastError() );
return "";
}
#if defined(_UNICODE)
std::wstring toWideString(const char *s) {
std::basic_ostringstream<TCHAR> buf;
buf << s;
return buf.str();
}
#endif
#endif
struct TextUnitTest : public UnitTest {
void run() {
assert( parseLL("123") == 123 );
assert( parseLL("-123000000000") == -123000000000LL );
}
} textUnitTest;
}
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