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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "base/string_util.h"
#include <string.h>
#include <vector>
#include "base/basictypes.h"
#include "base/logging.h"
#include "base/singleton.h"
#include "unicode/ucnv.h"
#include "unicode/numfmt.h"
#include "unicode/ustring.h"
// Codepage <-> Wide -----------------------------------------------------------
// Convert a unicode string into the specified codepage_name. If the codepage
// isn't found, return false.
bool WideToCodepage(const std::wstring& wide,
const char* codepage_name,
OnStringUtilConversionError::Type on_error,
std::string* encoded) {
encoded->clear();
UErrorCode status = U_ZERO_ERROR;
UConverter* converter = ucnv_open(codepage_name, &status);
if (!U_SUCCESS(status))
return false;
const UChar* uchar_src;
int uchar_len;
#ifdef U_WCHAR_IS_UTF16
uchar_src = wide.c_str();
uchar_len = static_cast<int>(wide.length());
#else // U_WCHAR_IS_UTF16
// When wchar_t is wider than UChar (16 bits), transform |wide| into a
// UChar* string. Size the UChar* buffer to be large enough to hold twice
// as many UTF-16 code points as there are UCS-4 characters, in case each
// character translates to a UTF-16 surrogate pair, and leave room for a NUL
// terminator.
std::vector<UChar> wide_uchar(wide.length() * 2 + 1);
u_strFromWCS(&wide_uchar[0], wide_uchar.size(), &uchar_len,
wide.c_str(), wide.length(), &status);
uchar_src = &wide_uchar[0];
DCHECK(U_SUCCESS(status)) << "failed to convert wstring to UChar*";
#endif // U_WCHAR_IS_UTF16
int encoded_max_length = UCNV_GET_MAX_BYTES_FOR_STRING(uchar_len,
ucnv_getMaxCharSize(converter));
encoded->resize(encoded_max_length);
// Setup our error handler.
switch (on_error) {
case OnStringUtilConversionError::FAIL:
ucnv_setFromUCallBack(converter, UCNV_FROM_U_CALLBACK_STOP, 0,
NULL, NULL, &status);
break;
case OnStringUtilConversionError::SKIP:
ucnv_setFromUCallBack(converter, UCNV_FROM_U_CALLBACK_SKIP, 0,
NULL, NULL, &status);
break;
default:
NOTREACHED();
}
// ucnv_fromUChars returns size not including terminating null
int actual_size = ucnv_fromUChars(converter, &(*encoded)[0],
encoded_max_length, uchar_src, uchar_len, &status);
encoded->resize(actual_size);
ucnv_close(converter);
if (U_SUCCESS(status))
return true;
encoded->clear(); // Make sure the output is empty on error.
return false;
}
// Converts a string of the given codepage into unicode.
// If the codepage isn't found, return false.
bool CodepageToWide(const std::string& encoded,
const char* codepage_name,
OnStringUtilConversionError::Type on_error,
std::wstring* wide) {
wide->clear();
UErrorCode status = U_ZERO_ERROR;
UConverter* converter = ucnv_open(codepage_name, &status);
if (!U_SUCCESS(status))
return false;
// The worst case is all the input characters are non-BMP (32-bit) ones.
size_t uchar_max_length = encoded.length() * 2 + 1;
UChar* uchar_dst;
#ifdef U_WCHAR_IS_UTF16
uchar_dst = WriteInto(wide, uchar_max_length);
#else
// When wchar_t is wider than UChar (16 bits), convert into a temporary
// UChar* buffer.
std::vector<UChar> wide_uchar(uchar_max_length);
uchar_dst = &wide_uchar[0];
#endif // U_WCHAR_IS_UTF16
// Setup our error handler.
switch (on_error) {
case OnStringUtilConversionError::FAIL:
ucnv_setToUCallBack(converter, UCNV_TO_U_CALLBACK_STOP, 0,
NULL, NULL, &status);
break;
case OnStringUtilConversionError::SKIP:
ucnv_setToUCallBack(converter, UCNV_TO_U_CALLBACK_SKIP, 0,
NULL, NULL, &status);
break;
default:
NOTREACHED();
}
int actual_size = ucnv_toUChars(converter,
uchar_dst,
static_cast<int>(uchar_max_length),
encoded.data(),
static_cast<int>(encoded.length()),
&status);
ucnv_close(converter);
if (!U_SUCCESS(status)) {
wide->clear(); // Make sure the output is empty on error.
return false;
}
#ifndef U_WCHAR_IS_UTF16
// When wchar_t is wider than UChar (16 bits), it's not possible to wind up
// with any more wchar_t elements than UChar elements. ucnv_toUChars
// returns the number of UChar elements not including the NUL terminator, so
// leave extra room for that.
u_strToWCS(WriteInto(wide, actual_size + 1), actual_size + 1, &actual_size,
uchar_dst, actual_size, &status);
DCHECK(U_SUCCESS(status)) << "failed to convert UChar* to wstring";
#endif // U_WCHAR_IS_UTF16
wide->resize(actual_size);
return true;
}
// Number formatting -----------------------------------------------------------
// TODO: http://b/id=1092584 Come up with a portable pthread_once, and use
// that to keep a singleton instead of putting it in the platform-dependent
// file.
NumberFormat* NumberFormatSingleton();
std::wstring FormatNumber(int64 number) {
NumberFormat* number_format = NumberFormatSingleton();
if (!number_format) {
// As a fallback, just return the raw number in a string.
return StringPrintf(L"%lld", number);
}
UnicodeString ustr;
number_format->format(number, ustr);
#ifdef U_WCHAR_IS_UTF16
return std::wstring(ustr.getBuffer(),
static_cast<std::wstring::size_type>(ustr.length()));
#else // U_WCHAR_IS_UTF16
wchar_t buffer[64]; // A int64 is less than 20 chars long, so 64 chars
// leaves plenty of room for formating stuff.
int length = 0;
UErrorCode error = U_ZERO_ERROR;
u_strToWCS(buffer, 64, &length, ustr.getBuffer(), ustr.length() , &error);
if (U_FAILURE(error)) {
NOTREACHED();
// As a fallback, just return the raw number in a string.
return StringPrintf(L"%lld", number);
}
return std::wstring(buffer, static_cast<std::wstring::size_type>(length));
#endif // U_WCHAR_IS_UTF16
}
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