transmission/libtransmission/utils.mm

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// This file Copyright © 2022-2023 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#import <Foundation/Foundation.h>
#include <string>
#include <string_view>
#include "utils.h"
// macOS implementation of tr_strv_convert_utf8() that autodetects the encoding.
// This replaces the generic implementation of the function in utils.cc.
std::string tr_strv_convert_utf8(std::string_view sv)
{
// UTF-8 encoding
char const* validUTF8 = [[NSString alloc] initWithBytes:std::data(sv) length:std::size(sv) encoding:NSUTF8StringEncoding].UTF8String;
if (validUTF8)
{
return std::string(validUTF8);
}
// autodetection of the encoding (#3434)
NSString* convertedString;
NSStringEncoding stringEncoding = [NSString
stringEncodingForData:[NSData dataWithBytes:std::data(sv) length:std::size(sv)]
encodingOptions:@{
// We disallow lossy conversion, and will leave it to `utf8::unchecked::replace_invalid`.
NSStringEncodingDetectionAllowLossyKey : @NO,
// We only set the likely language.
// If we were to set suggested encodings, then whatever is listed first would take precedence on all others, making for instance kCFStringEncodingDOSJapanese (cp932) and kCFStringEncodingDOSRussian (cp866) taking priority on each other.
NSStringEncodingDetectionLikelyLanguageKey : NSLocale.currentLocale.languageCode
}
convertedString:&convertedString
usedLossyConversion:nil];
if (stringEncoding)
{
validUTF8 = convertedString.UTF8String;
if (validUTF8)
{
return std::string(validUTF8);
}
}
// invalid encoding
return tr_strv_replace_invalid(sv);
}