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Bug 301797: UTF-8 decoder drops byte on encoding error. r=jshin, sr=bzbarsky, a=bsmedberg

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smontagu%smontagu.org 2005-07-26 09:38:50 +00:00
parent d954808c1c
commit 99011ec3ca
1 changed files with 16 additions and 1 deletions
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17
intl/uconv/src/nsUTF8ToUnicode.cpp
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@ -76,11 +76,26 @@ nsUTF8ToUnicode::nsUTF8ToUnicode()
//----------------------------------------------------------------------
// Subclassing of nsTableDecoderSupport class [implementation]
/**
* Normally the maximum length of the output of the UTF8 decoder in UTF16
* code units is the same as the length of the input in UTF8 code units,
* since 1-byte, 2-byte and 3-byte UTF-8 sequences decode to a single
* UTF-16 character, and 4-byte UTF-8 sequences decode to a surrogate pair.
*
* However, there is an edge case where the output can be longer than the
* input: if the previous buffer ended with an incomplete multi-byte
* sequence and this buffer does not begin with a valid continuation
* byte, we will return NS_ERROR_UNEXPECTED and the caller may insert a
* replacement character in the output buffer which corresponds to no
* character in the input buffer. So in the worst case the destination
* will need to be one code unit longer than the source.
* See bug 301797.
*/
NS_IMETHODIMP nsUTF8ToUnicode::GetMaxLength(const char * aSrc,
PRInt32 aSrcLength,
PRInt32 * aDestLength)
{
*aDestLength = aSrcLength;
*aDestLength = aSrcLength + 1;
return NS_OK;
}