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(decode_coding_iso_2022): Check MSB of bytes more rigidly.

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This commit is contained in:
Kenichi Handa 2009-06-18 10:29:51 +00:00
parent 90f20d9422
commit cf299835b1
2 changed files with 19 additions and 12 deletions
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26
src/coding.c
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@ -3600,7 +3600,7 @@ decode_coding_iso_2022 (coding)
while (1)
{
int c1, c2;
int c1, c2, c3;
src_base = src;
consumed_chars_base = consumed_chars;
@ -3984,26 +3984,28 @@ decode_coding_iso_2022 (coding)
}
/* Now we know CHARSET and 1st position code C1 of a character.
Produce a decoded character while getting 2nd position code
C2 if necessary. */
c1 &= 0x7F;
Produce a decoded character while getting 2nd and 3rd
position codes C2, C3 if necessary. */
if (CHARSET_DIMENSION (charset) > 1)
{
ONE_MORE_BYTE (c2);
if (c2 < 0x20 || (c2 >= 0x80 && c2 < 0xA0))
if (c2 < 0x20 || (c2 >= 0x80 && c2 < 0xA0)
|| ((c1 & 0x80) != (c2 & 0x80)))
/* C2 is not in a valid range. */
goto invalid_code;
c1 = (c1 << 8) | (c2 & 0x7F);
if (CHARSET_DIMENSION (charset) > 2)
if (CHARSET_DIMENSION (charset) == 2)
c1 = (c1 << 8) | c2;
else
{
ONE_MORE_BYTE (c2);
if (c2 < 0x20 || (c2 >= 0x80 && c2 < 0xA0))
/* C2 is not in a valid range. */
ONE_MORE_BYTE (c3);
if (c3 < 0x20 || (c3 >= 0x80 && c3 < 0xA0)
|| ((c1 & 0x80) != (c3 & 0x80)))
/* C3 is not in a valid range. */
goto invalid_code;
c1 = (c1 << 8) | (c2 & 0x7F);
c1 = (c1 << 16) | (c2 << 8) | c2;
}
}
c1 &= 0x7F7F7F;
CODING_DECODE_CHAR (coding, src, src_base, src_end, charset, c1, c);
if (c < 0)
{