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(detect_coding_iso2022): Don't check the byte length of

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succeeding codes (0xa0..0xFF) if the codes follows single shit
code.
This commit is contained in:
Kenichi Handa 1998-08-24 06:42:56 +00:00
parent 46babb23b6
commit f46869e46f
1 changed files with 24 additions and 8 deletions
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32
src/coding.c
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@ -683,7 +683,7 @@ detect_coding_iso2022 (src, src_end)
{
int mask = CODING_CATEGORY_MASK_ISO;
int mask_found = 0;
int reg[4], shift_out = 0;
int reg[4], shift_out = 0, single_shifting = 0;
int c, c1, i, charset;
reg[0] = CHARSET_ASCII, reg[1] = reg[2] = reg[3] = -1;
@ -693,6 +693,7 @@ detect_coding_iso2022 (src, src_end)
switch (c)
{
case ISO_CODE_ESC:
single_shifting = 0;
if (src >= src_end)
break;
c = *src++;
@ -781,6 +782,7 @@ detect_coding_iso2022 (src, src_end)
break;
case ISO_CODE_SO:
single_shifting = 0;
if (shift_out == 0
&& (reg[1] >= 0
|| SHIFT_OUT_OK (CODING_CATEGORY_IDX_ISO_7_ELSE)
@ -793,6 +795,7 @@ detect_coding_iso2022 (src, src_end)
break;
case ISO_CODE_SI:
single_shifting = 0;
if (shift_out == 1)
{
/* Locking shift in. */
@ -802,6 +805,7 @@ detect_coding_iso2022 (src, src_end)
break;
case ISO_CODE_CSI:
single_shifting = 0;
case ISO_CODE_SS2:
case ISO_CODE_SS3:
{
@ -815,6 +819,7 @@ detect_coding_iso2022 (src, src_end)
if (coding_system_table[CODING_CATEGORY_IDX_ISO_8_2]->flags
& CODING_FLAG_ISO_SINGLE_SHIFT)
newmask |= CODING_CATEGORY_MASK_ISO_8_2;
single_shifting = 1;
}
if (VECTORP (Vlatin_extra_code_table)
&& !NILP (XVECTOR (Vlatin_extra_code_table)->contents[c]))
@ -833,9 +838,13 @@ detect_coding_iso2022 (src, src_end)
default:
if (c < 0x80)
break;
{
single_shifting = 0;
break;
}
else if (c < 0xA0)
{
single_shifting = 0;
if (VECTORP (Vlatin_extra_code_table)
&& !NILP (XVECTOR (Vlatin_extra_code_table)->contents[c]))
{
@ -860,12 +869,19 @@ detect_coding_iso2022 (src, src_end)
mask &= ~(CODING_CATEGORY_MASK_ISO_7BIT
| CODING_CATEGORY_MASK_ISO_7_ELSE);
mask_found |= CODING_CATEGORY_MASK_ISO_8_1;
while (src < src_end && *src >= 0xA0)
src++;
if ((src - src_begin - 1) & 1 && src < src_end)
mask &= ~CODING_CATEGORY_MASK_ISO_8_2;
else
mask_found |= CODING_CATEGORY_MASK_ISO_8_2;
/* Check the length of succeeding codes of the range
0xA0..0FF. If the byte length is odd, we exclude
CODING_CATEGORY_MASK_ISO_8_2. We can check this only
when we are not single shifting. */
if (!single_shifting)
{
while (src < src_end && *src >= 0xA0)
src++;
if ((src - src_begin - 1) & 1 && src < src_end)
mask &= ~CODING_CATEGORY_MASK_ISO_8_2;
else
mask_found |= CODING_CATEGORY_MASK_ISO_8_2;
}
}
break;
}