+++ /dev/null
-/*
-** Copyright 1998 - 2009 Double Precision, Inc. See COPYING for
-** distribution information.
-*/
-
-
-#include <stdio.h>
-#include <ctype.h>
-#include <string.h>
-#include <stdlib.h>
-#include <errno.h>
-
-#include "rfc822.h"
-#include "rfc822hdr.h"
-#include "rfc2047.h"
-#include "../unicode/unicode.h"
-#if LIBIDN
-#include <idna.h>
-#include <stringprep.h>
-#endif
-
-static const char rcsid[]="$Id: rfc2047.c,v 1.23 2009/11/18 03:38:50 mrsam Exp $";
-
-#define RFC2047_ENCODE_FOLDLENGTH 76
-
-static const char xdigit[]="0123456789ABCDEF";
-static const char base64tab[]=
-"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
-
-static char *a_rfc2047_encode_str(const char *str, const char *charset,
- int isaddress);
-
-static void rfc2047_encode_header_do(const struct rfc822a *a,
- const char *charset,
- void (*print_func)(char, void *),
- void (*print_separator)(const char *,
- void *), void *ptr)
-{
- rfc822_print_common(a, &a_rfc2047_encode_str, charset,
- print_func, print_separator, ptr);
-}
-
-static char *rfc822_encode_domain_int(const char *pfix,
- size_t pfix_len,
- const char *domain)
-{
- char *q;
-
-#if LIBIDN
- int err;
- char *p;
-
- err=idna_to_ascii_8z(domain, &p, 0);
-
- if (err != IDNA_SUCCESS)
- {
- errno=EINVAL;
- return NULL;
- }
-#else
- char *p;
-
- p=strdup(domain);
-
- if (!p)
- return NULL;
-#endif
-
- q=malloc(strlen(p)+pfix_len+1);
-
- if (!q)
- {
- free(p);
- return NULL;
- }
-
- if (pfix_len)
- memcpy(q, pfix, pfix_len);
-
- strcpy(q + pfix_len, p);
- free(p);
- return q;
-}
-
-char *rfc822_encode_domain(const char *address,
- const char *charset)
-{
- const struct unicode_info *ui=unicode_find(charset);
- const char *cp;
- char *p, *q;
-
- if (!ui)
- {
- errno=EINVAL;
- return NULL;
- }
-
- p=unicode_convert(address, ui, &unicode_UTF8);
-
- if (!p)
- return NULL;
-
- cp=strchr(p, '@');
-
- if (!cp)
- {
- q=rfc822_encode_domain_int("", 0, p);
- free(p);
- return q;
- }
-
- ++cp;
- q=rfc822_encode_domain_int(p, cp-p, cp);
- free(p);
- return q;
-}
-
-static char *a_rfc2047_encode_str(const char *str, const char *charset,
- int isaddress)
-{
- size_t l;
- char *p;
-
- if (isaddress)
- return rfc822_encode_domain(str, charset);
-
- for (l=0; str[l]; l++)
- if (str[l] & 0x80)
- break;
-
- if (str[l] == 0)
- {
- size_t n;
-
- for (l=0; str[l]; l++)
- if (strchr(RFC822_SPECIALS, str[l]))
- break;
-
- if (str[l] == 0)
- return (strdup(str));
-
- for (n=3, l=0; str[l]; l++)
- {
- switch (str[l]) {
- case '"':
- case '\\':
- ++n;
- break;
- }
-
- ++n;
- }
-
- p=malloc(n);
-
- if (!p)
- return NULL;
-
- p[0]='"';
-
- for (n=1, l=0; str[l]; l++)
- {
- switch (str[l]) {
- case '"':
- case '\\':
- p[n++]='\\';
- break;
- }
-
- p[n++]=str[l];
- }
- p[n++]='"';
- p[n]=0;
-
- return (p);
- }
-
- return rfc2047_encode_str(str, charset, rfc2047_qp_allow_word);
-}
-
-static void count(char c, void *p);
-static void counts2(const char *c, void *p);
-static void save(char c, void *p);
-static void saves2(const char *c, void *p);
-
-char *rfc2047_encode_header_addr(const struct rfc822a *a,
- const char *charset)
-{
-size_t l;
-char *s, *p;
-
- l=1;
- rfc2047_encode_header_do(a, charset, &count, &counts2, &l);
- if ((s=malloc(l)) == 0) return (0);
- p=s;
- rfc2047_encode_header_do(a, charset, &save, &saves2, &p);
- *p=0;
- return (s);
-}
-
-
-char *rfc2047_encode_header_tobuf(const char *name, /* Header name */
- const char *header, /* Header's contents */
- const char *charset)
-{
- if (rfc822hdr_is_addr(name))
- {
- char *s=0;
-
- struct rfc822t *t;
- struct rfc822a *a;
-
- if ((t=rfc822t_alloc_new(header, NULL, NULL)) != 0)
- {
- if ((a=rfc822a_alloc(t)) != 0)
- {
- s=rfc2047_encode_header_addr(a, charset);
- rfc822a_free(a);
- }
- rfc822t_free(t);
- }
- return s;
- }
-
- return rfc2047_encode_str(header, charset, rfc2047_qp_allow_word);
-}
-
-static void count(char c, void *p)
-{
- ++*(size_t *)p;
-}
-
-static void counts2(const char *c, void *p)
-{
- if (*c == ',')
- count(*c++, p);
-
- count('\n', p);
- count(' ', p);
-
- while (*c) count(*c++, p);
-}
-
-static void save(char c, void *p)
-{
- **(char **)p=c;
- ++*(char **)p;
-}
-
-static void saves2(const char *c, void *p)
-{
- if (*c == ',')
- save(*c++, p);
-
- save('\n', p);
- save(' ', p);
-
- while (*c) save(*c++, p);
-}
-
-static int encodebase64(const char *ptr, size_t len, const char *charset,
- int (*func)(const char *, size_t, void *), void *arg,
- size_t foldlen, size_t offset)
-{
- unsigned char ibuf[3];
- char obuf[4];
- int i, rc;
-
- while (len)
- {
- if ((rc=(*func)("=?", 2, arg)) ||
- (rc=(*func)(charset, strlen(charset), arg))||
- (rc=(*func)("?B?", 3, arg)))
- return rc;
- i = offset + 2 + strlen(charset) + 3;
- offset = 0;
-
- while (len)
- {
- size_t n=len > 3 ? 3:len;
-
- ibuf[0]= ptr[0];
- if (n>1)
- ibuf[1]=ptr[1];
- else
- ibuf[1]=0;
- if (n>2)
- ibuf[2]=ptr[2];
- else
- ibuf[2]=0;
- ptr += n;
- len -= n;
-
- obuf[0] = base64tab[ ibuf[0] >>2 ];
- obuf[1] = base64tab[(ibuf[0] & 0x03)<<4|ibuf[1]>>4];
- obuf[2] = base64tab[(ibuf[1] & 0x0F)<<2|ibuf[2]>>6];
- obuf[3] = base64tab[ ibuf[2] & 0x3F ];
- if (n < 2)
- obuf[2] = '=';
- if (n < 3)
- obuf[3] = '=';
-
- if ((rc=(*func)(obuf, 4, arg)))
- return rc;
-
- i += 4;
- if (foldlen && i + 2 > foldlen - 1 + 4)
- break;
- }
-
- if ((rc=(*func)("?=", 2, arg)))
- return rc;
- if (len)
- /*
- * Encoded-words must be sepalated by
- * linear-white-space.
- */
- if ((rc=(*func)(" ", 1, arg)))
- return rc;
- }
- return 0;
-}
-
-#define ISSPACE(i) ((i)=='\t' || (i)=='\r' || (i)=='\n' || (i)==' ')
-#define DOENCODE(i) (((i) & 0x80) || (i)=='"' || (i)=='=' || \
- ((unsigned char)(i) < 0x20 && !ISSPACE(i)) || \
- !(*qp_allow)(i))
-
-int rfc2047_encode_callback_base64(const char *str, const char *charset,
- int (*qp_allow)(char),
- int (*func)(const char *, size_t, void *),
- void *arg)
-{
-int rc;
-int dummy=-1;
-size_t i;
-size_t offset=27; /* FIXME: initial offset for line length */
-const struct unicode_info *uiptr = unicode_find(charset);
-unicode_char *ustr, *uptr;
-
- if (!str || !*str)
- return 0;
-
- for (i=0; str[i]; i++)
- if (DOENCODE(str[i]))
- break;
- if (str[i] == 0)
- return i? (*func)(str, strlen(str), arg): 0;
-
- /*
- * Multibyte or stateful charsets must be encoded with care of
- * character boundaries. Charsets with replaceable capability can be
- * encoded replacing errorneous characters. Otherwise, output without
- * care of character boundaries or errors.
- */
- if (!uiptr ||
- !(uiptr->flags & (UNICODE_MB | UNICODE_SISO)) ||
- (!(uiptr->flags & UNICODE_REPLACEABLE) &&
- !(ustr = (uiptr->c2u)(uiptr, str, &dummy))) ||
- !(ustr = (uiptr->c2u)(uiptr, str, NULL)))
- return encodebase64(str, strlen(str), charset, func, arg,
- RFC2047_ENCODE_FOLDLENGTH, offset);
-
- uptr = ustr;
- while (*uptr)
- {
- unicode_char save_uc;
- char *wstr=NULL;
- size_t i, end, j;
-
- if ((i = offset + 2 + strlen(charset) + 3) >
- RFC2047_ENCODE_FOLDLENGTH - 2)
- /* Keep room for at least one character. */
- i = RFC2047_ENCODE_FOLDLENGTH - 2;
- offset = 0;
-
- /*
- * Figure out where to break encoded-word.
- * Take a small chunk of Unicode string and convert it back to
- * the original charset. If the result exseeds line length,
- * try again with a shorter chunk.
- */
- end = 0;
- while (uptr[end] && end < (RFC2047_ENCODE_FOLDLENGTH - i) / 2)
- end++;
- /*
- * FIXME: Unicode character with `combining'
- * property etc. should not be treated as
- * separate character.
- */
- j = end;
- while (j)
- {
- save_uc = uptr[j];
- uptr[j] = (unicode_char)0;
- wstr = (uiptr->u2c)(uiptr, uptr, &dummy);
- uptr[j] = save_uc;
-
- if (!wstr)
- /* Possiblly a part of one character extracted to
- * multiple Unicode characters (e.g. base unicode
- * character of one combined character). Try on
- * shorter chunk.
- */
- {
- if (j == 0)
- break;
-
- j--; /* FIXME */
- continue;
- }
-
- if (i + ((strlen(wstr) + 3-1) / 3) * 4 + 2 >
- RFC2047_ENCODE_FOLDLENGTH - 1)
- /*
- * Encoded string exceeded line length.
- * Try on shorter chunk.
- */
- {
- size_t k=j;
-
- j--; /* FIXME */
- if (j == 0)
- /* Only one character exeeds line length.
- * Anyway, encode it. */
- {
- j = k;
- break;
- }
- free(wstr);
- continue;
- }
-
- break;
- }
-
- if (!wstr)
- {
- end = 1;
- rc = encodebase64("?", 1, charset, func, arg, 0, 0);
- }
- else
- {
- end = j;
- rc = encodebase64(wstr, strlen(wstr),
- charset, func, arg, 0, 0);
- free(wstr);
- }
- if (rc)
- {
- free(ustr);
- return rc;
- }
- uptr += end;
-
- if (*uptr)
- /*
- * Encoded-words must be sepalated by
- * linear-white-space.
- */
- if ((rc=(*func)(" ", 1, arg)))
- {
- free(ustr);
- return rc;
- }
- }
- free(ustr);
- return 0;
-}
-
-#define DOENCODEWORD(c) \
- (((c) & 0x80) || (c) == '"' || (unsigned char)(c) <= 0x20 || \
- (c) == '_' || (c) == '=' || (c) == '?' || !(*qp_allow)(c))
-
-int rfc2047_encode_callback(const char *str, const char *charset,
- int (*qp_allow)(char),
- int (*func)(const char *, size_t, void *),
- void *arg)
-{
-int rc;
-int maxlen;
-const struct unicode_info *ci = unicode_find(charset);
-
- if (!str || !*str)
- return 0;
-
- if (ci && ci->flags & UNICODE_SISO)
- return rfc2047_encode_callback_base64(str, charset, qp_allow,
- func, arg);
-
- /* otherwise, output quoted-printable-encoded. */
-
- while (*str)
- {
- size_t i, j, n, c;
-
- for (i=0; str[i]; i++)
- if (!ISSPACE((int)(unsigned char)str[i])
- && DOENCODE(str[i]))
- break;
- if (str[i] == 0)
- return ( i ? (*func)(str, i, arg):0);
-
- /* Find start of word */
-
- while (i)
- {
- --i;
- if (ISSPACE((int)(unsigned char)str[i]))
- {
- ++i;
- break;
- }
- }
- if (i)
- {
- rc= (*func)(str, i, arg);
- if (rc) return (rc);
- str += i;
- }
-
- /*
- ** Figure out when to stop MIME decoding. Consecutive
- ** MIME-encoded words are MIME-encoded together.
- */
-
- i=0;
-
- for (;;)
- {
- for ( ; str[i]; i++)
- if (ISSPACE((int)(unsigned char)str[i]))
- break;
- if (str[i] == 0)
- break;
-
- for (c=i; str[c] && ISSPACE((int)(unsigned char)str[c]);
- ++c)
- ;
-
- for (; str[c]; c++)
- if (ISSPACE((int)(unsigned char)str[c]) ||
- DOENCODE(str[c]))
- break;
-
- if (str[c] == 0 || ISSPACE((int)(unsigned char)str[c]))
- break;
- i=c;
- }
-
- /*
- ** Figure out whether base64 is a better choice.
- */
-
- n=0;
-
- for (j=0; j<i; j++)
- if (DOENCODEWORD(str[j]))
- ++n;
-
- if (n > i/10)
- {
- encodebase64(str, i, charset, func, arg,
- 70, 0);
- str += i;
- continue;
- }
-
-
-
- /* Output mimeified text, insert spaces at 70+ character
- ** boundaries for line wrapping.
- */
-
- maxlen=strlen(charset)+10;
-
- if (maxlen < 65)
- maxlen=74-maxlen;
- else
- maxlen=10;
-
- c=0;
- while (i)
- {
- if (c == 0)
- {
- if ( (rc=(*func)("=?", 2, arg)) != 0 ||
- (rc=(*func)(charset, strlen(charset),
- arg)) != 0 ||
- (rc=(*func)("?Q?", 3, arg)) != 0)
- return (rc);
- c += strlen(charset)+5;
- }
-
- if (DOENCODEWORD(*str))
- {
- char buf[3];
-
- buf[0]='=';
- buf[1]=xdigit[ ( *str >> 4) & 0x0F ];
- buf[2]=xdigit[ *str & 0x0F ];
-
- if ( (rc=*str == ' ' ? (*func)("_", 1, arg)
- : (*func)(buf, 3, arg)) != 0)
- return (rc);
- c += *str == ' ' ? 1:3;
- ++str;
- --i;
- }
- else
- {
- for (j=0; j < i && !DOENCODEWORD(str[j]); j++)
- if (j + c >= maxlen)
- break;
- if ( (rc=(*func)(str, j, arg)) != 0)
- return (rc);
- c += j;
- str += j;
- i -= j;
- }
-
- if (i == 0 || c >= maxlen)
- {
- if ( (rc=(*func)("?= ", i ? 3:2, arg)) != 0)
- return (rc);
-
- c=0;
- }
- }
- }
- return (0);
-}
-
-static int count_char(const char *c, size_t l, void *p)
-{
-size_t *i=(size_t *)p;
-
- *i += l;
- return (0);
-}
-
-static int save_char(const char *c, size_t l, void *p)
-{
-char **s=(char **)p;
-
- memcpy(*s, c, l);
- *s += l;
- return (0);
-}
-
-char *rfc2047_encode_str(const char *str, const char *charset,
- int (*qp_allow)(char c))
-{
-size_t i=1;
-char *s, *p;
-
- (void)rfc2047_encode_callback(str, charset,
- qp_allow,
- &count_char, &i);
- if ((s=malloc(i)) == 0) return (0);
- p=s;
- (void)rfc2047_encode_callback(str, charset,
- qp_allow,
- &save_char, &p);
- *p=0;
- return (s);
-}
-
-int rfc2047_qp_allow_any(char c)
-{
- return 1;
-}
-
-int rfc2047_qp_allow_comment(char c)
-{
- if (c == '(' || c == ')' || c == '"')
- return 0;
- return 1;
-}
-
-int rfc2047_qp_allow_word(char c)
-{
- return strchr(base64tab, c) != NULL ||
- strchr("*-=_", c) != NULL;
-}
HCoop / hcoop / debian / courier-authlib.git / blobdiff