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MultibyteToWchar: correctly handle UTF-16 surrogate pairs.

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* Whilst in WcharToMultibyte, we correctly convert our UTF-32
  wchar characters to multibyte, the same wasn't done in
  MultibyteToWchar. Now, if we detect a leading surrogate,
  we'll re-read the multibyte sequence with space for a UTF-16
  pair, which allows U16_GET to correctly convert the UTF-16
  byte sequence into the needed UTF-32 codepoint.

Fixes #13184.
This commit is contained in:
Jessica Hamilton
2017-01-12 06:39:55 +13:00
parent d2423e4b3c
commit 92b9c8649b
1 changed files with 15 additions and 2 deletions
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src/system/libroot/add-ons/icu/ICUCtypeData.cpp
+15 -2
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@@ -223,13 +223,26 @@ ICUCtypeData::MultibyteToWchar(wchar_t* wcOut, const char* mb, size_t mbLen,
UErrorCode icuStatus = U_ZERO_ERROR;
const char* buffer = mb;
UChar targetBuffer[2];
UChar targetBuffer[3];
UChar* target = targetBuffer;
ucnv_toUnicode(converter, &target, target + 1, &buffer, buffer + mbLen,
NULL, FALSE, &icuStatus);
size_t sourceLengthUsed = buffer - mb;
size_t targetLengthUsed = (size_t)(target - targetBuffer);
if (U16_IS_LEAD(targetBuffer[0])) {
// we have a surrogate pair, so re-read with enough space for a pair
// of characters instead
TRACE(("MultibyteToWchar(): have a surrogate pair\n"));
ucnv_resetToUnicode(converter);
buffer = mb;
target = targetBuffer;
ucnv_toUnicode(converter, &target, target + 2, &buffer, buffer + mbLen,
NULL, FALSE, &icuStatus);
sourceLengthUsed = buffer - mb;
targetLengthUsed = (size_t)(target - targetBuffer);
}
if (icuStatus == U_BUFFER_OVERFLOW_ERROR && targetLengthUsed > 0) {
// we've got one character, which is all that we wanted
icuStatus = U_ZERO_ERROR;
@@ -248,7 +261,7 @@ ICUCtypeData::MultibyteToWchar(wchar_t* wcOut, const char* mb, size_t mbLen,
result = B_BAD_INDEX;
} else {
UChar32 unicodeChar = 0xBADBEEF;
U16_GET(targetBuffer, 0, 0, 2, unicodeChar);
U16_GET(targetBuffer, 0, 0, targetLengthUsed, unicodeChar);
if (unicodeChar == 0) {
// reset to initial state