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|
/*--[litlib.c]-----------------------------------------------------------------
| Copyright (C) 2004 Digital Rights Software
|
| This file is part of the "openclit" library for processing .LIT files.
|
| "Openclit" is free software; you can redistribute it and/or modify
| it under the terms of the GNU General Public License as published by
| the Free Software Foundation; either version 2 of the License, or
| (at your option) any later version.
|
| This program is distributed in the hope that it will be useful,
| but WITHOUT ANY WARRANTY; without even the implied warranty of
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
| GNU General Public License for more details.
|
| You should have received a copy of the GNU General Public License
| along with this program; if not, write to the Free Software
| Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
| The GNU General Public License may also be available at the following
| URL: http://www.gnu.org/licenses/gpl.html
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include "litlib.h"
#include "litinternal.h"
int lit_i_utf8_len_to_bytes(U8 * src, int lenSrc, int sizeSrc);
/*****************************************************************************/
/*--[strmerge]----------------------------------------------------------------
| Routine to "safely" merge strings, while reporting errors on failure
| This keeps merging strings until it finds a NULL.
| Bad things happens to the user that forgets that final NULL!
*/
char * lit_i_strmerge(const char * first, ...)
{
va_list ap;
const char * s;
char * new, *ptr;
int len;
s = first;
len = 0;
va_start(ap, first);
do {
len += strlen(s);
s = va_arg(ap, char *);
} while (s);
ptr = new = (char *)malloc(len + 1);
if (!new) {
lit_error(0,"Unable to malloc %d bytes for a string.",len);
return NULL;
}
s = first;
va_start(ap, first);
do {
strcpy(ptr, s);
ptr += strlen(ptr);
s = va_arg(ap, char *);
} while (s);
*(ptr) = '\0';
va_end(ap);
return new;
}
/*--[lit_i_read_utf8_string]---------------------------------------------------
|
| This routine allocates memory for and copies an UTF8 string from the
| current location.
*/
U8 * lit_i_read_utf8_string(U8 * p, int remaining, int * size)
{
U8 * sNew;
int len, nbytes;
len = 1;
if (remaining < 1) goto out_of_bytes;
len = *p;
nbytes = lit_i_utf8_len_to_bytes((p + 1), len, remaining - 1);
if (nbytes < 0) goto out_of_bytes;
sNew = (U8 *)malloc(nbytes + 1);
if (!sNew) {
lit_error(ERR_R|ERR_LIBC,"malloc(%d) failed!",nbytes+1);
return NULL;
}
if (!sNew) return NULL;
memcpy( sNew, (p+1), nbytes);
sNew[nbytes] = '\0';
if (size) *size = nbytes + 1;
return sNew;
out_of_bytes:
lit_error(ERR_R,
"utf8 reader tried to read past an internal file boundary!\n"
"\tTried to read %d characters, but only %d bytes are left.",
len, remaining);
return NULL;
}
/*--[lit_i_utf8_len_to_bytes]--------------------------------------------------
|
| This converts a count of UTF8 elements to the amount of bytes that it
| consumes. This is for the parsing of '/manifest' files, where the length
| field isn't the number of bytes as might be expected.
|
| Most other LIT strings (such as the directory) store byte counts for
| the length.
*/
int lit_i_utf8_len_to_bytes(U8 * src, int lenSrc, int sizeSrc)
{
int nchars, nbytes;
nbytes = 0;
nchars = 0;
while (nchars < lenSrc) {
/* The only thing NOT counted in lenSrc is a character 10xx xxxx */
if ((*(src + nbytes) & 0xC0) != 0x80) nchars++;
nbytes++;
if (nbytes > sizeSrc) {
return -1;
}
}
/* Copy over any trailing unicode bytes */
while (( *(src + nbytes) & 0xC0) == 0x80) {
nbytes++;
if (nbytes > sizeSrc) {
return -1;
}
}
return nbytes;
}
|
