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UCS-2 read/write functions

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git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@22559 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Love Hörnquist Åstrand
2008-02-03 16:35:07 +00:00
parent 16158908c9
commit a500df0977
7 changed files with 316 additions and 15 deletions
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122
lib/wind/utf8.c
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@@ -231,34 +231,136 @@ wind_ucs4utf8_length(const uint32_t *in, size_t in_len, size_t *out_len)
/**
* Read in an UCS2 from a buffer.
*
* @param ptr The input buffer to read from
* @param len the length of the input buffer, must be an even number.
* @param ptr The input buffer to read from.
* @param len the length of the input buffer.
* @param flags Flags to control the behavior of the function.
* @param out the output UCS2, the array must be at least out/2 long.
* @param out_len the output length
*
* @return returns 0 on success, an wind error code otherwise.
* @ingroup wind
*/
ssize_t
_wind_ucs2read(void *ptr, size_t len, uint16_t *out)
int
wind_ucs2read(const void *ptr, size_t len, unsigned int *flags,
uint16_t *out, size_t *out_len)
{
unsigned char *p = ptr;
int little = 1;
const unsigned char *p = ptr;
int little = ((*flags) & WIND_RW_LE);
size_t olen = *out_len;
/** if len is zero, flags are unchanged */
if (len == 0) {
*out_len = 0;
return 0;
}
/** if len is odd, WIND_ERR_LENGTH_NOT_MOD2 is returned */
if (len & 1)
return WIND_ERR_LENGTH_NOT_EVEN;
/* check for BOM */
return WIND_ERR_LENGTH_NOT_MOD2;
/**
* If the flags WIND_RW_BOM is set, check for BOM. If not BOM is
* found, check is LE/BE flag is already and use that otherwise
* fail with WIND_ERR_NO_BOM. When done, clear WIND_RW_BOM and
* the LE/BE flag and set the resulting LE/BE flag.
*/
if ((*flags) & WIND_RW_BOM) {
uint16_t bom = (p[0] << 8) + p[1];
if (bom == 0xfffe || bom == 0xfeff) {
little = (bom == 0xfffe);
p += 2;
len -= 2;
} else if (((*flags) & (WIND_RW_LE|WIND_RW_BE)) != 0) {
/* little already set */
} else
return WIND_ERR_NO_BOM;
*flags = ((*flags) & ~(WIND_RW_BOM|WIND_RW_LE|WIND_RW_BE));
*flags |= little ? WIND_RW_LE : WIND_RW_BE;
}
while (len) {
if (olen < 1)
return WIND_ERR_OVERRUN;
if (little)
*out = (p[1] << 8) + p[0];
else
*out = (p[0] << 8) + p[1];
out++; p += 2;
out++; p += 2; len -= 2; olen--;
}
return (p - (unsigned char *)ptr) >> 1;
*out_len -= olen;
return 0;
}
/**
* Write an UCS2 string to a buffer.
*
* @param in The input UCS2 string.
* @param in_len the length of the input buffer.
* @param flags Flags to control the behavior of the function.
* @param ptr The input buffer to write to, the array must be at least
* (in + 1) * 2 bytes long.
* @param out_len the output length
*
* @return returns 0 on success, an wind error code otherwise.
* @ingroup wind
*/
int
wind_ucs2write(const uint16_t *in, size_t in_len, unsigned int *flags,
void *ptr, size_t *out_len)
{
unsigned char *p = ptr;
size_t len = *out_len;
/** If in buffer is not of length be mod 2, WIND_ERR_LENGTH_NOT_MOD2 is returned*/
if (len & 1)
return WIND_ERR_LENGTH_NOT_MOD2;
/** On zero input length, flags are preserved */
if (in_len == 0) {
*out_len = 0;
return 0;
}
/** If flags have WIND_RW_BOM set, the byte order mark is written
* first to the output data */
if ((*flags) & WIND_RW_BOM) {
uint16_t bom = 0xfffe;
if (len < 2)
return WIND_ERR_OVERRUN;
if ((*flags) & WIND_RW_LE) {
p[0] = (bom >> 8) & 0xff;
p[1] = (bom ) & 0xff;
} else {
p[1] = (bom ) & 0xff;
p[0] = (bom >> 8) & 0xff;
}
len -= 2;
}
while (in_len) {
/** If the output wont fit into out_len, WIND_ERR_OVERRUN is returned */
if (len < 2)
return WIND_ERR_OVERRUN;
if ((*flags) & WIND_RW_LE) {
p[0] = (in[0] >> 8) & 0xff;
p[1] = (in[0] ) & 0xff;
} else {
p[1] = (in[0] ) & 0xff;
p[0] = (in[0] >> 8) & 0xff;
}
len -= 2;
in_len--;
p += 2;
in++;
}
*out_len -= len;
return 0;
}
/**
* Convert an UCS2 string to a UTF-8 string.
*