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/* $OpenBSD: preconv.c,v 1.2 2014/11/01 04:07:25 schwarze Exp $ */
/*
* Copyright (c) 2011 Kristaps Dzonsons <kristaps@bsd.lv>
* Copyright (c) 2014 Ingo Schwarze <schwarze@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include "mandoc.h"
#include "libmandoc.h"
int
preconv_encode(struct buf *ib, size_t *ii, struct buf *ob, size_t *oi,
int *filenc)
{
size_t i;
const long one = 1L;
int state, be;
unsigned int accum;
unsigned char cu;
if ( ! (*filenc & MPARSE_UTF8))
goto latin;
state = 0;
accum = 0U;
be = 0;
/* Quick test for big-endian value. */
if ( ! (*((const char *)(&one))))
be = 1;
for (i = *ii; i < ib->sz; i++) {
cu = ib->buf[i];
if (state) {
if ( ! (cu & 128) || (cu & 64)) {
/* Bad sequence header. */
break;
}
/* Accept only legitimate bit patterns. */
if (cu > 191 || cu < 128) {
/* Bad in-sequence bits. */
break;
}
accum |= (cu & 63) << --state * 6;
if (state)
continue;
/*
* Accum is held in little-endian order as
* stipulated by the UTF-8 sequence coding. We
* need to convert to a native big-endian if our
* architecture requires it.
*/
if (be)
accum = (accum >> 24) |
((accum << 8) & 0x00FF0000) |
((accum >> 8) & 0x0000FF00) |
(accum << 24);
if (accum < 0x80)
ob->buf[(*oi)++] = accum;
else
*oi += snprintf(ob->buf + *oi,
11, "\\[u%.4X]", accum);
*ii = i + 1;
*filenc &= ~MPARSE_LATIN1;
return(1);
} else {
/*
* Entering a UTF-8 state: if we encounter a
* UTF-8 bitmask, calculate the expected UTF-8
* state from it.
*/
for (state = 0; state < 7; state++)
if ( ! (cu & (1 << (7 - state))))
break;
/* Accept only legitimate bit patterns. */
switch (state--) {
case (4):
if (cu <= 244 && cu >= 240) {
accum = (cu & 7) << 18;
continue;
}
/* Bad 4-sequence start bits. */
break;
case (3):
if (cu <= 239 && cu >= 224) {
accum = (cu & 15) << 12;
continue;
}
/* Bad 3-sequence start bits. */
break;
case (2):
if (cu <= 223 && cu >= 194) {
accum = (cu & 31) << 6;
continue;
}
/* Bad 2-sequence start bits. */
break;
default:
/* Bad sequence bit mask. */
break;
}
break;
}
}
/* FALLTHROUGH: Invalid or incomplete UTF-8 sequence. */
latin:
if ( ! (*filenc & MPARSE_LATIN1))
return(0);
*oi += snprintf(ob->buf + *oi, 11,
"\\[u%.4X]", (unsigned char)ib->buf[(*ii)++]);
*filenc &= ~MPARSE_UTF8;
return(1);
}
int
preconv_cue(const struct buf *b, size_t offset)
{
const char *ln, *eoln, *eoph;
size_t sz, phsz;
ln = b->buf + offset;
sz = b->sz - offset;
/* Look for the end-of-line. */
if (NULL == (eoln = memchr(ln, '\n', sz)))
eoln = ln + sz;
/* Check if we have the correct header/trailer. */
if ((sz = (size_t)(eoln - ln)) < 10 ||
memcmp(ln, ".\\\" -*-", 7) || memcmp(eoln - 3, "-*-", 3))
return(MPARSE_UTF8 | MPARSE_LATIN1);
/* Move after the header and adjust for the trailer. */
ln += 7;
sz -= 10;
while (sz > 0) {
while (sz > 0 && ' ' == *ln) {
ln++;
sz--;
}
if (0 == sz)
break;
/* Find the end-of-phrase marker (or eoln). */
if (NULL == (eoph = memchr(ln, ';', sz)))
eoph = eoln - 3;
else
eoph++;
/* Only account for the "coding" phrase. */
if ((phsz = eoph - ln) < 7 ||
strncasecmp(ln, "coding:", 7)) {
sz -= phsz;
ln += phsz;
continue;
}
sz -= 7;
ln += 7;
while (sz > 0 && ' ' == *ln) {
ln++;
sz--;
}
if (0 == sz)
return(0);
/* Check us against known encodings. */
if (phsz > 4 && !strncasecmp(ln, "utf-8", 5))
return(MPARSE_UTF8);
if (phsz > 10 && !strncasecmp(ln, "iso-latin-1", 11))
return(MPARSE_LATIN1);
return(0);
}
return(MPARSE_UTF8 | MPARSE_LATIN1);
}
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