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Fix for the bug [ 1528369 ] utf8::find_invalid does not return the start of a seqence

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git-svn-id: http://svn.code.sf.net/p/utfcpp/code@21 a809a056-fc17-0410-9590-b4f493f8b08e
This commit is contained in:
ntrifunovic 2006-07-25 17:20:44 +00:00
parent db36241cc1
commit abc6fd5428
1 changed files with 34 additions and 11 deletions
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45
source/utf8.h
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@ -138,8 +138,10 @@ namespace internal
if (is_trail(*(++it))) {
cp = ((cp << 6) & 0x7ff) + ((*it) & 0x3f);
}
else
else {
--it;
return INCOMPLETE_SEQUENCE;
}
break;
case 3:
if (is_trail(*(++it))) {
@ -147,11 +149,15 @@ namespace internal
if (is_trail(*(++it))) {
cp += (*it) & 0x3f;
}
else
else {
--it; --it;
return INCOMPLETE_SEQUENCE;
}
}
else
else {
--it;
return INCOMPLETE_SEQUENCE;
}
break;
case 4:
if (is_trail(*(++it))) {
@ -161,35 +167,52 @@ namespace internal
if (is_trail(*(++it))) {
cp += (*it) & 0x3f;
}
else
else {
--it; --it; --it;
return INCOMPLETE_SEQUENCE;
}
}
else
else {
--it; --it;
return INCOMPLETE_SEQUENCE;
}
}
else
else {
--it;
return INCOMPLETE_SEQUENCE;
}
break;
}
// Is the code point valid?
if (cp > CODE_POINT_MAX || is_surrogate(cp) || cp == 0xfffe || cp == 0xffff)
if (cp > CODE_POINT_MAX || is_surrogate(cp) || cp == 0xfffe || cp == 0xffff) {
for (size_t i = 0; i < sequence_length - 1; ++i)
--it;
return INVALID_CODE_POINT;
}
if (code_point)
*code_point = cp;
// Overlong sequence?
if (cp < 0x80) {
if (sequence_length != 1)
if (sequence_length != 1) {
for (size_t i = 0; i < sequence_length - 1; ++i)
--it;
return OVERLONG_SEQUENCE;
}
}
else if (cp < 0x800) {
if (sequence_length != 2)
if (sequence_length != 2) {
for (size_t i = 0; i < sequence_length - 1; ++i)
--it;
return OVERLONG_SEQUENCE;
}
}
else if (cp < 0x10000) {
if (sequence_length != 3)
if (sequence_length != 3) {
for (size_t i = 0; i < sequence_length - 1; ++i)
--it;
return OVERLONG_SEQUENCE;
}
}
++it;