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Improve character conversion code a little.

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git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@14481 72102866-910b-0410-8b05-ffd578937521
This commit is contained in:
Richard Frith-Macdonald 2002-09-18 09:34:33 +00:00
parent 6ef88fbcd8
commit 61c5624b4c
4 changed files with 111 additions and 103 deletions
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157
Source/Unicode.m
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@ -1135,6 +1135,11 @@ GSFromUnicode(unsigned char **dst, unsigned int *size, const unichar *src,
unichar base = 0;
_ucc_ *table = 0;
unsigned tsize = 0;
unsigned char escape = 0;
_ucc_ *etable = 0;
unsigned etsize = 0;
_ucc_ *ltable = 0;
unsigned ltsize = 0;
BOOL swapped = NO;
BOOL result = YES;
@ -1270,120 +1275,90 @@ bases:
goto tables;
#endif
tables:
case NSGSM0338StringEncoding:
base = 0;
table = GSM0338_uni_to_char_table;
tsize = GSM0338_tsize;
escape = 0x1b;
etable = GSM0338_escapes;
etsize = GSM0338_esize;
if (strict == NO)
{
while (spos < slen)
{
unichar u = src[spos++];
if (swapped == YES)
{
u = ((u & 0xff00 >> 8) + ((u & 0x00ff) << 8));
}
if (dpos >= bsize)
{
GROW();
}
if (u < base)
{
ptr[dpos++] = (char)u;
}
else
{
int i = chop(u, table, tsize);
if (i < 0)
{
ptr[dpos++] = '*';
}
else
{
ptr[dpos++] = table[i].to;
}
}
}
ltable = GSM0338_lossy;
ltsize = GSM0338_lsize;
}
else
{
while (spos < slen)
{
unichar u = src[spos++];
goto tables;
if (swapped == YES)
{
u = ((u & 0xff00 >> 8) + ((u & 0x00ff) << 8));
}
if (dpos >= bsize)
{
GROW();
}
if (u < base)
{
ptr[dpos++] = (char)u;
}
else
{
int i = chop(u, table, tsize);
if (i < 0)
{
result = NO;
spos = slen;
break;
}
ptr[dpos++] = table[i].to;
}
}
}
break;
case NSGSM0338StringEncoding:
tables:
while (spos < slen)
{
unichar u = src[spos++];
int i;
int i;
/* Swap byte order if necessary */
if (swapped == YES)
{
u = ((u & 0xff00 >> 8) + ((u & 0x00ff) << 8));
}
/* Grow output buffer to make room if necessary */
if (dpos >= bsize)
{
GROW();
}
i = chop(u, GSM0338_uni_to_char_table, GSM0338_tsize);
if (i >= 0)
if (u < base)
{
ptr[dpos] = GSM0338_uni_to_char_table[i].to;
/*
* The character set has a lower section whose contents
* are identical to unicode, so no mapping is needed.
*/
ptr[dpos++] = (char)u;
}
else if (table != 0 && (i = chop(u, table, tsize)) >= 0)
{
/*
* The character mapping is found in a basic table.
*/
ptr[dpos++] = table[i].to;
}
else if (etable != 0 && (i = chop(u, etable, etsize)) >= 0)
{
/*
* The character mapping is found in a table of simple
* escape sequences consisting of an escape byte followed
* by another single byte.
*/
ptr[dpos++] = escape;
if (dpos >= bsize)
{
GROW();
}
ptr[dpos++] = etable[i].to;
}
else if (ltable != 0 && (i = chop(u, ltable, ltsize)) >= 0)
{
/*
* The character is found in a lossy mapping table.
*/
ptr[dpos++] = ltable[i].to;
}
else if (strict == NO)
{
/*
* The default lossy mapping generates an asterisk.
*/
ptr[dpos++] = '*';
}
else
{
i = chop(u, GSM0338_escapes, GSM0338_esize);
if (i >= 0)
{
ptr[dpos++] = 0x1b;
if (dpos >= bsize)
{
GROW();
}
ptr[dpos] = GSM0338_escapes[i].to;
}
else if (strict == YES)
{
result = NO;
break;
}
else
{
ptr[dpos] = '*';
}
/*
* No mapping has been found.
*/
result = NO;
spos = slen;
break;
}
dpos++;
}
break;