+++ /dev/null
-/*
-** Copyright 2000-2003 Double Precision, Inc.
-** See COPYING for distribution information.
-**
-*/
-
-#include "unicode_config.h"
-#include "unicode.h"
-#include <string.h>
-#include <stdlib.h>
-
-static const char rcsid[]="$Id: utf7imap.c,v 1.6 2004/05/23 14:28:25 mrsam Exp $";
-
-static const char mbase64[]="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,";
-
-static char mbase64_lookup[256];
-static int mbase64_lookup_init=0;
-
-unicode_char *unicode_modutf7touc(const char *s, int *err)
-{
- size_t l=strlen(s), i;
- unicode_char *uc=malloc(sizeof(unicode_char)*(l+1));
- /* That's the worst case scenario, that's all. */
-
- if (!uc)
- return (NULL);
-
- if (err)
- *err= -1;
-
- /* First time through - initialize fast lookup table */
-
- if (!mbase64_lookup_init)
- {
- mbase64_lookup_init=1;
-
- for (i=0; i<256; i++)
- mbase64_lookup[i]= (char)-1;
-
- for (i=0; mbase64[i]; i++)
- mbase64_lookup[(int)mbase64[i]]=i;
- }
- i=0;
-
- for (l=0; s[l]; l++)
- {
- unicode_char uu;
- int bitcount;
-
- if ( s[l] < 0x20 || s[l] >= 0x7F )
- {
- free(uc);
- if (err) *err=l;
- return (NULL);
- }
-
- if ( s[l] != '&' )
- {
- uc[i++]= (int)(unsigned char)s[l];
- continue;
- }
-
- if ( s[++l] == '-' )
- {
- uc[i++]='&';
- continue;
- }
-
- bitcount=0;
- uu=0;
-
- for ( ; s[l] != '-'; l++)
- {
- int bits;
-
- if ((char)(bits=
- mbase64_lookup[s[l] & 255]) == (char)-1)
- {
- free(uc);
- if (err) *err=l;
- return (0);
- }
-
- if (bitcount + 6 >= 16)
- /* These six more bits are enough for UCS2 */
- {
- int n=bitcount + 6 - 16; /* Leftover */
-
- uu = (uu << (6-n)) | (bits >> n);
- uc[i++] = (uu & 0xFFFF);
-
- uu = bits; /* The leftovers */
- bitcount=n;
- }
- else
- {
- uu = (uu << 6) | bits;
- bitcount += 6;
- }
- }
- }
- uc[i]=0;
- return (uc);
-}
-
-static size_t uctoutf7_pass(const unicode_char *, const unicode_char *,
- char *);
-
-char *unicode_uctomodutf7(const unicode_char *p)
-{
- return unicode_uctomodutf7x(p, NULL);
-}
-
-char *unicode_uctomodutf7x(const unicode_char *p,
- const unicode_char *specials)
-{
- size_t n=uctoutf7_pass(p, specials, NULL);
- char *s=malloc(n);
-
- if (s)
- uctoutf7_pass(p, specials, s);
- return (s);
-}
-
-static int is_special(unicode_char uc, const unicode_char *specials)
-{
- while (specials && *specials)
- if (*specials++ == uc)
- return 1;
-
- return uc < 0x20 || uc >= 0x7F;
-}
-
-static size_t uctoutf7_pass(const unicode_char *uc,
- const unicode_char *specials,
- char *p)
-{
- size_t n=0;
-
- while (*uc)
- {
- unsigned bits, bitcount;
-
- if (!is_special(*uc, specials))
- {
- /* Straightforward deal for straightforward ASCII */
-
- if (p)
- *p++ = (char)*uc;
- ++n;
-
- if (*uc++ == '&')
- {
- if (p) *p++ = '-';
- ++n;
- }
- continue;
- }
-
- if (p) *p++ = '&'; /* Begin modified base64 */
- ++n;
-
- bits=bitcount=0;
- while ( *uc && is_special(*uc, specials))
- {
- unicode_char uu= *uc++ & 0xFFFF;
- int counter=16;
-
- if (!uu) uu=0xFFFD;
-
- /* Process 16 bits */
-
- while (counter)
- {
- int x;
-
- if (counter + bitcount < 6)
- {
- /* Add these bits, then we're done */
-
- bits = (bits << counter) |
- (uu >> (16-counter));
- bitcount += counter;
- break;
- }
-
- /* Have enough bits to encode */
-
- x= 6 - bitcount;
-
- bits = (bits << x) | (uu >> (16-x));
- uu = (uu << x) & 0xFFFF;
- counter -= x;
-
- if (p)
- *p++ = mbase64[bits];
- ++n;
- bits=bitcount=0;
- }
- }
-
- if (bitcount) /* Leftovers */
- {
- bits <<= (6-bitcount);
- if (p)
- *p++ = mbase64[bits];
- ++n;
- }
-
- if (p)
- *p++ = '-';
- ++n;
- /* End modified base64 */
- }
-
- if (p)
- *p=0;
- ++n;
- return (n);
-}
-
-static char *toupper_func(const struct unicode_info *u,
- const char *cp, int *ip)
-{
- unicode_char *uc=unicode_modutf7touc(cp, ip), *p;
- char *s;
-
- if (!uc) return (0);
-
- for (p=uc; *p; p++)
- *p=unicode_uc(*p);
-
- s=unicode_uctomodutf7(uc);
- if (!s && ip)
- *ip=0;
- free(uc);
- return (s);
-}
-
-static char *tolower_func(const struct unicode_info *u,
- const char *cp, int *ip)
-{
- unicode_char *uc=unicode_modutf7touc(cp, ip), *p;
- char *s;
-
- if (!uc) return (0);
-
- for (p=uc; *p; p++)
- *p=unicode_lc(*p);
-
- s=unicode_uctomodutf7(uc);
- free(uc);
- if (!s && ip)
- *ip=0;
- return (s);
-}
-
-static char *totitle_func(const struct unicode_info *u,
- const char *cp, int *ip)
-{
- unicode_char *uc=unicode_modutf7touc(cp, ip), *p;
- char *s;
-
- if (!uc) return (0);
-
- for (p=uc; *p; p++)
- *p=unicode_tc(*p);
-
- s=unicode_uctomodutf7(uc);
- if (!s && ip)
- *ip=0;
- free(uc);
- return (s);
-}
-
-static unicode_char *tou(const struct unicode_info *ui, const char *cs,
- int *err)
-{
- return unicode_modutf7touc(cs, err);
-}
-
-
-static char *fromu(const struct unicode_info *ui,
- const unicode_char *uc, int *err)
-{
- if (err) *err= -1;
- return unicode_uctomodutf7(uc);
-}
-
-const struct unicode_info unicode_IMAP_MODUTF7 = {
- "X-IMAP-MODUTF-7",
- UNICODE_UTF | UNICODE_MB |
- UNICODE_HEADER_BASE64,
- tou,
- fromu,
- toupper_func,
- tolower_func,
- totitle_func};
HCoop / hcoop / debian / courier-authlib.git / blobdiff