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(TWO_MORE_BYTES): New macro.

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(detect_coding_utf_16): Use TWO_MORE_BYTES instead of
ONE_MORE_BYTE.
This commit is contained in:
Kenichi Handa 2009-01-14 12:19:44 +00:00
parent 97d42150b4
commit f56a445091
2 changed files with 57 additions and 5 deletions
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54
src/coding.c
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@ -743,6 +743,47 @@ static struct coding_system coding_categories[coding_category_max];
consumed_chars++; \
} while (0)
/* Safely get two bytes from the source text pointed by SRC which ends
at SRC_END, and set C1 and C2 to those bytes. If there are not
enough bytes in the source for C1, it jumps to `no_more_source'.
If there are not enough bytes in the source for C2, set C2 to -1.
If multibytep is nonzero and a multibyte character is found at SRC,
set C1 and/or C2 to the negative value of the character code. The
caller should declare and set these variables appropriately in
advance:
src, src_end, multibytep
It is intended that this macro is used in detect_coding_utf_16. */
#define TWO_MORE_BYTES(c1, c2) \
do { \
if (src == src_end) \
goto no_more_source; \
c1 = *src++; \
if (multibytep && (c1 & 0x80)) \
{ \
if ((c1 & 0xFE) == 0xC0) \
c1 = ((c1 & 1) << 6) | *src++; \
else \
{ \
c1 = c2 = -1; \
break; \
} \
} \
if (src == src_end) \
c2 = -1; \
else \
{ \
c2 = *src++; \
if (multibytep && (c2 & 0x80)) \
{ \
if ((c2 & 0xFE) == 0xC0) \
c2 = ((c2 & 1) << 6) | *src++; \
else \
c2 = -1; \
} \
} \
} while (0)
#define ONE_MORE_BYTE_NO_CHECK(c) \
do { \
@ -1575,8 +1616,7 @@ detect_coding_utf_16 (coding, detect_info)
return 0;
}
ONE_MORE_BYTE (c1);
ONE_MORE_BYTE (c2);
TWO_MORE_BYTES (c1, c2);
if ((c1 == 0xFF) && (c2 == 0xFE))
{
detect_info->found |= (CATEGORY_MASK_UTF_16_LE
@ -1593,6 +1633,11 @@ detect_coding_utf_16 (coding, detect_info)
| CATEGORY_MASK_UTF_16_BE_NOSIG
| CATEGORY_MASK_UTF_16_LE_NOSIG);
}
else if (c1 < 0 || c2 < 0)
{
detect_info->rejected |= CATEGORY_MASK_UTF_16;
return 0;
}
else
{
/* We check the dispersion of Eth and Oth bytes where E is even and
@ -1610,8 +1655,9 @@ detect_coding_utf_16 (coding, detect_info)
while (1)
{
ONE_MORE_BYTE (c1);
ONE_MORE_BYTE (c2);
TWO_MORE_BYTES (c1, c2);
if (c1 < 0 || c2 < 0)
break;
if (! e[c1])
{
e[c1] = 1;