Initial checkin

Imported from subversion report, converted to git. Updated all paths in
scripts and makefiles, reflecting the new directory hierarchy.

1 files changed, 1050 insertions, 0 deletions

diff --git a/rfc822/rfc2047u.c b/rfc822/rfc2047u.c
new file mode 100644
index 0000000..c1bc48b
--- /dev/null
+++ b/rfc822/rfc2047u.c
@@ -0,0 +1,1050 @@
+/*
+** Copyright 1998 - 2009 Double Precision, Inc.  See COPYING for
+** distribution information.
+*/
+
+#include	"rfc822.h"
+#include	<stdio.h>
+#include	<ctype.h>
+#include	<string.h>
+#include	<stdlib.h>
+#include	<errno.h>
+
+#include	"rfc822hdr.h"
+#include	"rfc2047.h"
+#include	"../unicode/unicode.h"
+
+#if LIBIDN
+#include <idna.h>
+#include <stringprep.h>
+#endif
+
+
+static ssize_t rfc822_decode_rfc2047_atom(const char *str,
+					  size_t cnt,
+
+					  void (*callback)(const char *,
+							   const char *,
+							   const char *,
+							   size_t,
+							   void *),
+					  void *ptr);
+
+static int rfc2047_decode_unicode(const char *text,
+				  const char *chset,
+				  void (*callback)(const char *, size_t,
+						   void *),
+				  void *ptr);
+
+struct decode_unicode_s {
+	const char *mychset;
+
+	char *bufptr;
+	size_t bufsize;
+} ;
+
+static void save_unicode_text(const char *p, size_t l, void *ptr)
+{
+	struct decode_unicode_s *s=
+		(struct decode_unicode_s *)ptr;
+
+	if (s->bufptr)
+		memcpy(s->bufptr+s->bufsize, p, l);
+
+	s->bufsize += l;
+}
+
+struct rfc822_display_name_s {
+	const char *chset;
+	void (*print_func)(const char *, size_t, void *);
+	void *ptr;
+};
+
+static void unknown_charset(const char *chset,
+			    const char *tochset,
+			    void (*print_func)(const char *, size_t, void *),
+			    void *ptr)
+{
+	static const char unknown[]="[unknown character set: ";
+
+	(*print_func)(unknown, sizeof(unknown)-1, ptr);
+	(*print_func)(chset, strlen(chset), ptr);
+	(*print_func)(" -> ", 4, ptr);
+	(*print_func)(tochset, strlen(tochset), ptr);
+	(*print_func)("]", 1, ptr);
+}
+
+static void rfc822_display_addr_cb(const char *chset,
+				   const char *lang,
+				   const char *content,
+				   size_t cnt,
+				   void *dummy)
+{
+	struct rfc822_display_name_s *s=
+		(struct rfc822_display_name_s *)dummy;
+	char *ptr;
+	char *buf;
+
+	buf=malloc(cnt+1);
+
+	if (!buf)
+		return;
+
+	memcpy(buf, content, cnt);
+	buf[cnt]=0;
+
+	ptr=libmail_u_convert_tobuf(buf, chset, s->chset, NULL);
+	free(buf);
+
+	if (ptr)
+	{
+		(*s->print_func)(ptr, strlen(ptr), s->ptr);
+		free(ptr);
+	}
+	else
+	{
+		unknown_charset(chset, s->chset, s->print_func, s->ptr);
+		return;
+	}
+}
+
+static
+int rfc822_display_name_int(const struct rfc822a *rfcp, int index,
+			    const char *chset,
+			    void (*print_func)(const char *, size_t, void *),
+			    void *ptr)
+{
+	struct rfc822_display_name_s s;
+	const struct rfc822addr *addrs;
+
+	struct rfc822token *i;
+	int	prev_isatom=0;
+	int	isatom=0;
+	ssize_t rc;
+
+	if (index < 0 || index >= rfcp->naddrs)	return 0;
+
+	addrs=rfcp->addrs+index;
+
+	if (!addrs->name)
+		return rfc822_display_addr(rfcp, index, chset, print_func, ptr);
+
+	if (chset == NULL)
+	{
+		s.chset="iso-8859-1";
+	}
+	else
+	{
+		s.chset=chset;
+	}
+
+	s.print_func=print_func;
+	s.ptr=ptr;
+
+	for (i=addrs->name; i; i=i->next, prev_isatom=isatom)
+	{
+		isatom=rfc822_is_atom(i->token);
+		if (isatom && prev_isatom)
+			(*print_func)(" ", 1, ptr);
+
+		if (i->token == '"' || i->token == '(')
+		{
+			size_t l=i->len;
+			char *p, *q, *r;
+
+			if (i->token == '(')
+			{
+				if (l > 2)
+					l -= 2;
+				else
+					l=0;
+			}
+
+			p=malloc(l+1);
+
+			if (!p)
+				return -1;
+
+			if (l)
+			{
+				if (i->token == '(')
+				{
+					memcpy(p, i->ptr+1, l);
+				}
+				else
+				{
+					memcpy(p, i->ptr, l);
+				}
+			}
+
+
+			p[l]=0;
+
+			for (q=r=p; *q; *r++ = *q++)
+				if (*q == '\\' && q[1])
+					++q;
+
+			*r=0;
+
+			if (chset == NULL)
+			{
+				(*print_func)(p, strlen(p), ptr);
+			}
+			else if (rfc822_display_hdrvalue("subject",
+							 p, s.chset,
+							 print_func,
+							 NULL, ptr) < 0)
+			{
+				free(p);
+				return -1;
+			}
+			free(p);
+			continue;
+		}
+
+		if (i->token)
+		{
+			char c= (char)i->token;
+
+			(*print_func)(&c, 1, ptr);
+			continue;
+		}
+
+		rc=chset ? rfc822_decode_rfc2047_atom(i->ptr, i->len,
+						      rfc822_display_addr_cb,
+						      &s):0;
+
+		if (rc < 0)
+			return -1;
+
+		if (rc == 0)
+		{
+			(*print_func)(i->ptr, i->len, ptr);
+			continue;
+		}
+
+		if (i->next && i->next->token == 0)
+		{
+			rc=rfc822_decode_rfc2047_atom(i->next->ptr,
+						      i->next->len,
+						      NULL, NULL);
+
+			if (rc < 0)
+				return -1;
+
+			if (rc > 0)
+				isatom=0; /* Suppress the separating space */
+		}
+	}
+	return 0;
+}
+
+int rfc822_display_name(const struct rfc822a *rfcp, int index,
+			const char *chset,
+			void (*print_func)(const char *, size_t, void *),
+			void *ptr)
+{
+	const struct rfc822addr *addrs;
+
+	if (index < 0 || index >= rfcp->naddrs)	return 0;
+
+	addrs=rfcp->addrs+index;
+
+	if (!addrs->tokens)
+		return 0;
+
+	return rfc822_display_name_int(rfcp, index, chset,
+				       print_func, ptr);
+}
+
+char *rfc822_display_name_tobuf(const struct rfc822a *rfcp, int index,
+				const char *chset)
+{
+	struct decode_unicode_s s;
+	char *p;
+
+	s.bufptr=0;
+	s.bufsize=1;
+
+	if (rfc822_display_name(rfcp, index, chset, save_unicode_text, &s) < 0)
+		return NULL;
+	s.bufptr=p=malloc(s.bufsize);
+	if (!p)
+		return (0);
+
+	s.bufsize=0;
+	if (rfc822_display_name(rfcp, index, chset, save_unicode_text, &s) < 0)
+	{
+		free(s.bufptr);
+		return (0);
+	}
+	save_unicode_text("", 1, &s);
+
+	return (p);
+}
+
+int rfc822_display_namelist(const struct rfc822a *rfcp,
+			    const char *chset,
+			    void (*print_func)(const char *, size_t, void *),
+			    void *ptr)
+{
+	int n;
+
+	for (n=0; n<rfcp->naddrs; n++)
+	{
+		if (rfcp->addrs[n].tokens)
+		{
+			int err=rfc822_display_name(rfcp, n, chset,
+						    print_func, ptr);
+
+			if (err < 0)
+				return err;
+
+			(*print_func)("\n", 1, ptr);
+		}
+	}
+	return 0;
+}
+
+int rfc822_display_addr_str(const char *tok,
+			    const char *chset,
+			    void (*print_func)(const char *, size_t, void *),
+			    void *ptr)
+{
+	const char *p;
+
+	p=strchr(tok,'@');
+
+	if (!p)
+		p=tok;
+	else
+		++p;
+
+	if (chset != NULL)
+	{
+		int err=0;
+		char *utf8_ptr;
+
+		if (p > tok)
+			(*print_func)(tok, p-tok, ptr);
+
+#if LIBIDN
+		/*
+		** Invalid UTF-8 can make libidn go off the deep end. Add
+		** padding as a workaround.
+		*/
+		{
+			size_t s=strlen(p)+16;
+			char *cpy=malloc(s);
+
+			if (!cpy)
+				return 0;
+			memset(cpy, 0, s);
+			strcpy(cpy, p);
+
+			err=idna_to_unicode_8z8z(cpy, &utf8_ptr, 0);
+			free(cpy);
+		}
+
+		if (err != IDNA_SUCCESS)
+			utf8_ptr=0;
+#else
+		utf8_ptr=0;
+#endif
+
+		if (utf8_ptr == 0)
+			(*print_func)(p, strlen(p), ptr);
+		else
+		{
+			char *q=libmail_u_convert_tobuf(utf8_ptr,
+							"utf-8",
+							chset, NULL);
+			if (q)
+			{
+				(*print_func)(q, strlen(q), ptr);
+				free(q);
+			}
+			else
+			{
+				(*print_func)(p, strlen(p), ptr);
+			}
+			free(utf8_ptr);
+		}
+	}
+	else
+	{
+		(*print_func)(tok, strlen(tok), ptr);
+	}
+	return 0;
+}
+
+int rfc822_display_addr(const struct rfc822a *rfcp, int index,
+			const char *chset,
+			void (*print_func)(const char *, size_t, void *),
+			void *ptr)
+{
+	const struct rfc822addr *addrs;
+	char *tok;
+	int rc;
+
+	if (index < 0 || index >= rfcp->naddrs)	return 0;
+
+	addrs=rfcp->addrs+index;
+
+	if (!addrs->tokens)
+		return 0;
+
+	tok=rfc822_gettok(addrs->tokens);
+
+	if (!tok)
+		return 0;
+
+	rc=rfc822_display_addr_str(tok, chset, print_func, ptr);
+	free(tok);
+	return rc;
+}
+
+int rfc2047_print_unicodeaddr(const struct rfc822a *a,
+			      const char *charset,
+			      void (*print_func)(char, void *),
+			      void (*print_separator)(const char *, void *),
+			      void *ptr)
+{
+	const char *sep=NULL;
+	int n;
+
+	for (n=0; n<a->naddrs; ++n)
+	{
+		struct decode_unicode_s nbuf;
+		const struct rfc822addr *addrs;
+		size_t i=0;
+		char *cpbuf;
+		int need_braces=0;
+
+		addrs=a->addrs+n;
+
+		nbuf.bufptr=0;
+		nbuf.bufsize=1;
+
+		if (rfc822_display_name_int(a, n, charset,
+					    save_unicode_text, &nbuf) < 0)
+			return -1;
+
+		nbuf.bufptr=malloc(nbuf.bufsize);
+		nbuf.bufsize=0;
+		if (!nbuf.bufptr)
+			return -1;
+
+		if (rfc822_display_name_int(a, n, charset,
+					    save_unicode_text, &nbuf) < 0)
+		{
+			free(nbuf.bufptr);
+			return -1;
+		}
+		nbuf.bufptr[nbuf.bufsize]=0;
+
+		if (addrs->tokens == 0)
+		{
+			size_t i;
+
+			if (nbuf.bufsize == 1) /* ; */
+				sep=0;
+
+			if (sep)
+				(*print_separator)(sep, ptr);
+
+			for (i=0; i<nbuf.bufsize; ++i)
+				(*print_func)(nbuf.bufptr[i], ptr);
+			free(nbuf.bufptr);
+			if (nbuf.bufsize > 1)
+				(*print_separator)(" ", ptr);
+			sep=NULL;
+			continue;
+		}
+		if (sep)
+			(*print_separator)(sep, ptr);
+
+		if (!addrs->name)
+		{
+			nbuf.bufsize=0;
+			nbuf.bufptr[0]=0;
+		}
+
+		for (i=0; i<nbuf.bufsize; i++)
+			if (strchr(RFC822_SPECIALS, nbuf.bufptr[i]))
+				break;
+
+		cpbuf=libmail_u_convert_tobuf(nbuf.bufptr, "utf-8", charset,
+					      NULL);
+
+		if (!cpbuf)
+		{
+			const char *errmsg="\"(unknown character set)\"";
+
+			while (*errmsg)
+				(*print_func)(*errmsg++, ptr);
+			need_braces=1;
+		}
+		else
+		{
+			if (i < nbuf.bufsize)
+			{
+				(*print_func)('"', ptr);
+
+				for (i=0; cpbuf[i]; ++i)
+				{
+					if (cpbuf[i] == '\\' ||
+					    cpbuf[i] == '"')
+						(*print_func)('\\', ptr);
+					(*print_func)(cpbuf[i], ptr);
+				}
+				(*print_func)('"', ptr);
+				need_braces=1;
+			}
+                        else
+                        {
+                                for (i=0; cpbuf[i]; ++i)
+				{
+					need_braces=1;
+                                        (*print_func)(cpbuf[i], ptr);
+				}
+                        }
+
+			free(cpbuf);
+		}
+		free(nbuf.bufptr);
+
+		if (need_braces)
+		{
+			(*print_func)(' ', ptr);
+			(*print_func)('<', ptr);
+		}
+
+		nbuf.bufptr=0;
+		nbuf.bufsize=1;
+
+		if (rfc822_display_addr(a, n, charset,
+					save_unicode_text, &nbuf) < 0)
+			return -1;
+
+		nbuf.bufptr=malloc(nbuf.bufsize);
+		nbuf.bufsize=0;
+		if (!nbuf.bufptr)
+			return -1;
+
+		if (rfc822_display_addr(a, n, charset,
+					save_unicode_text, &nbuf) < 0)
+		{
+			free(nbuf.bufptr);
+			return -1;
+		}
+		for (i=0; i<nbuf.bufsize; i++)
+			(*print_func)(nbuf.bufptr[i], ptr);
+
+		free(nbuf.bufptr);
+
+		if (need_braces)
+			(*print_func)('>', ptr);
+		sep=", ";
+	}
+
+	return 0;
+}
+
+static int rfc2047_print_unicode_addrstr(const char *addrheader,
+					 const char *charset,
+					 void (*print_func)(char, void *),
+					 void (*print_separator)(const char *, void *),
+					 void (*err_func)(const char *, int, void *),
+					 void *ptr)
+{
+	struct rfc822t *t;
+	struct rfc822a *a;
+	int rc;
+
+	t=rfc822t_alloc_new(addrheader, err_func, ptr);
+
+	if (!t)
+		return -1;
+
+	a=rfc822a_alloc(t);
+
+	if (!a)
+	{
+		rfc822t_free(t);
+		return -1;
+	}
+	rc=rfc2047_print_unicodeaddr(a, charset, print_func, print_separator,
+				     ptr);
+	rfc822a_free(a);
+	rfc822t_free(t);
+	return (rc);
+}
+
+struct rfc822_display_hdrvalue_s {
+
+	void (*display_func)(const char *, size_t, void *);
+	void *ptr;
+};
+
+static void rfc822_display_hdrvalue_print_func(char c, void *ptr)
+{
+	struct rfc822_display_hdrvalue_s *s=
+		(struct rfc822_display_hdrvalue_s *)ptr;
+
+	(*s->display_func)(&c, 1, s->ptr);
+}
+
+static void rfc822_display_hdrvalue_print_separator(const char *cp, void *ptr)
+{
+	struct rfc822_display_hdrvalue_s *s=
+		(struct rfc822_display_hdrvalue_s *)ptr;
+
+	(*s->display_func)(cp, strlen(cp), s->ptr);
+	(*s->display_func)("", 0, s->ptr); /* Signal wrap point */
+}
+
+int rfc822_display_hdrvalue(const char *hdrname,
+			    const char *hdrvalue,
+			    const char *charset,
+			    void (*display_func)(const char *, size_t,
+						 void *),
+			    void (*err_func)(const char *, int, void *),
+			    void *ptr)
+{
+	struct rfc822_display_hdrvalue_s s;
+
+	s.display_func=display_func;
+	s.ptr=ptr;
+
+	if (rfc822hdr_is_addr(hdrname))
+	{
+		return rfc2047_print_unicode_addrstr(hdrvalue,
+						     charset,
+						     rfc822_display_hdrvalue_print_func,
+						     rfc822_display_hdrvalue_print_separator,
+						     NULL,
+						     &s);
+	}
+
+	return rfc2047_decode_unicode(hdrvalue, charset, display_func, ptr);
+}
+
+struct rfc822_display_hdrvalue_tobuf_s {
+	void (*orig_err_func)(const char *, int, void *);
+	void *orig_ptr;
+
+	size_t cnt;
+	char *buf;
+};
+
+static void rfc822_display_hdrvalue_tobuf_cnt(const char *ptr, size_t cnt,
+					      void *s)
+{
+	((struct rfc822_display_hdrvalue_tobuf_s *)s)->cnt += cnt;
+}
+
+static void rfc822_display_hdrvalue_tobuf_save(const char *ptr, size_t cnt,
+					       void *s)
+{
+	if (cnt)
+		memcpy(((struct rfc822_display_hdrvalue_tobuf_s *)s)->buf,
+		       ptr, cnt);
+
+	((struct rfc822_display_hdrvalue_tobuf_s *)s)->buf += cnt;
+}
+
+static void rfc822_display_hdrvalue_tobuf_errfunc(const char *ptr, int index,
+						  void *s)
+{
+	void (*f)(const char *, int, void *)=
+		((struct rfc822_display_hdrvalue_tobuf_s *)s)->orig_err_func;
+
+	if (f)
+		f(ptr, index,
+		  ((struct rfc822_display_hdrvalue_tobuf_s *)s)->orig_ptr);
+}
+
+char *rfc822_display_addr_tobuf(const struct rfc822a *rfcp, int index,
+				const char *chset)
+{
+	struct rfc822_display_hdrvalue_tobuf_s nbuf;
+	int errcode;
+	char *ptr;
+
+	nbuf.buf=0;
+	nbuf.cnt=1;
+
+	errcode=rfc822_display_addr(rfcp, index, chset,
+				    rfc822_display_hdrvalue_tobuf_cnt, &nbuf);
+
+	if (errcode < 0)
+		return NULL;
+
+	ptr=nbuf.buf=malloc(nbuf.cnt);
+	nbuf.cnt=0;
+	if (!ptr)
+		return NULL;
+
+	errcode=rfc822_display_addr(rfcp, index, chset,
+				    rfc822_display_hdrvalue_tobuf_save, &nbuf);
+
+	if (errcode < 0)
+	{
+		free(nbuf.buf);
+		return NULL;
+	}
+	*nbuf.buf=0;
+	return ptr;
+}
+
+char *rfc822_display_hdrvalue_tobuf(const char *hdrname,
+				    const char *hdrvalue,
+				    const char *charset,
+				    void (*err_func)(const char *, int,
+						     void *),
+				    void *ptr)
+{
+	struct rfc822_display_hdrvalue_tobuf_s s;
+	int errcode;
+	char *bufptr;
+
+	s.orig_err_func=err_func;
+	s.orig_ptr=ptr;
+	s.cnt=1;
+
+	errcode=rfc822_display_hdrvalue(hdrname, hdrvalue, charset,
+					rfc822_display_hdrvalue_tobuf_cnt,
+					rfc822_display_hdrvalue_tobuf_errfunc,
+					&s);
+
+	if (errcode < 0)
+		return NULL;
+
+	bufptr=s.buf=malloc(s.cnt);
+
+	if (!bufptr)
+		return NULL;
+
+	errcode=rfc822_display_hdrvalue(hdrname, hdrvalue, charset,
+					rfc822_display_hdrvalue_tobuf_save,
+					rfc822_display_hdrvalue_tobuf_errfunc,
+					&s);
+	if (errcode)
+	{
+		free(bufptr);
+		return NULL;
+	}
+	*s.buf=0;
+	return bufptr;
+}
+
+char *rfc822_display_addr_str_tobuf(const char *tok, const char *chset)
+{
+	struct rfc822_display_hdrvalue_tobuf_s s;
+	int errcode;
+	char *bufptr;
+
+	s.cnt=1;
+
+	errcode=rfc822_display_addr_str(tok, chset,
+					rfc822_display_hdrvalue_tobuf_cnt,
+					&s);
+
+	if (errcode < 0)
+		return NULL;
+
+	bufptr=s.buf=malloc(s.cnt);
+
+	if (!bufptr)
+		return NULL;
+
+	errcode=rfc822_display_addr_str(tok, chset,
+					rfc822_display_hdrvalue_tobuf_save,
+					&s);
+	if (errcode < 0)
+	{
+		free(bufptr);
+		return NULL;
+	}
+	*s.buf=0;
+	return bufptr;
+}
+
+
+static const char xdigit[]="0123456789ABCDEFabcdef";
+
+static const unsigned char decode64tab[]={
+	 0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+	 0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+	 0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, 62,  0,  0,  0, 63,
+	52, 53, 54, 55, 56, 57, 58, 59, 60, 61,  0,  0,  0, 99,  0,  0,
+	 0,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
+	15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,  0,  0,  0,  0,  0,
+	 0, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
+	41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,  0,  0,  0,  0,  0,
+	 0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+	 0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+	 0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+	 0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+	 0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+	 0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+	 0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+	 0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0
+};
+
+static int nyb(int c)
+{
+	const char	*p;
+	int n;
+
+	p=strchr(xdigit, c);
+
+	if (!p)
+		return 0;
+
+	n=p-xdigit;
+
+	if (n > 15)
+		n -= 6;
+
+	return n;
+}
+
+static size_t decodebase64(const char *ptr, size_t cnt,
+			   char *dec_buf)
+{
+	size_t  i, j;
+	char    a,b,c;
+	size_t  k;
+
+	i=cnt / 4;
+	i=i*4;
+	k=0;
+	for (j=0; j<i; j += 4)
+	{
+		int     w=decode64tab[(int)(unsigned char)ptr[j]];
+		int     x=decode64tab[(int)(unsigned char)ptr[j+1]];
+		int     y=decode64tab[(int)(unsigned char)ptr[j+2]];
+		int     z=decode64tab[(int)(unsigned char)ptr[j+3]];
+
+		a= (w << 2) | (x >> 4);
+		b= (x << 4) | (y >> 2);
+		c= (y << 6) | z;
+		dec_buf[k++]=a;
+		if ( ptr[j+2] != '=')
+			dec_buf[k++]=b;
+		if ( ptr[j+3] != '=')
+			dec_buf[k++]=c;
+	}
+	return (k);
+}
+
+
+static ssize_t rfc822_decode_rfc2047_atom(const char *str,
+					  size_t cnt,
+
+					  void (*callback)(const char *,
+							   const char *,
+							   const char *,
+							   size_t,
+							   void *),
+					  void *ptr)
+{
+	const char *chset_str;
+	const char *enc_str;
+	const char *content_str;
+
+	char *chset;
+	char *lang;
+
+	char *content;
+
+	size_t i;
+	size_t j;
+	size_t k;
+
+	size_t content_len;
+
+	if (cnt < 2 || str[0] != '=' || str[1] != '?')
+		return 0;
+
+	chset_str=str+2;
+
+	for (i=2; i<cnt; i++)
+		if (str[i] == '?')
+			break;
+
+	if (i >= cnt)
+		return 0;
+
+	enc_str= str + ++i;
+
+	for (; i < cnt; i++)
+		if (str[i] == '?')
+			break;
+
+	if (i >= cnt)
+		return 0;
+
+	content_str= str + ++i;
+
+	while (1)
+	{
+		if (cnt-i < 2)
+			return 0;
+
+		if (str[i] == '?' && str[i+1] == '=')
+			break;
+		++i;
+	}
+
+	for (j=0; chset_str[j] != '?'; ++j)
+		;
+
+	chset=malloc(j+1);
+
+	if (!chset)
+		return -1;
+
+	memcpy(chset, chset_str, j);
+	chset[j]=0;
+
+	lang=strchr(chset, '*');  /* RFC 2231 */
+
+	if (lang)
+		*lang++ = 0;
+	else
+		lang="";
+
+	content_len=str + i - content_str;
+
+	content=malloc(content_len+1);
+
+	if (!content)
+	{
+		free(chset);
+		return -1;
+	}
+
+	switch (*enc_str) {
+	case 'q':
+	case 'Q':
+
+		k=0;
+		for (j=0; j<content_len; j++)
+		{
+			char c;
+
+			if (content_str[j] == '=' && i-j >= 3)
+			{
+				content[k]=(char)(nyb(content_str[j+1])*16 +
+						  nyb(content_str[j+2]));
+				++k;
+				j += 2;
+				continue;
+			}
+
+			c=content_str[j];
+			if (c == '_')
+				c=' ';
+			content[k]=c;
+			++k;
+		}
+		break;
+
+	case 'b':
+	case 'B':
+		k=decodebase64(content_str, content_len, content);
+		break;
+	default:
+		free(content);
+		free(chset);
+		return (0);
+	}
+
+	if (callback)
+		(*callback)(chset, lang, content, k, ptr);
+	free(content);
+	free(chset);
+	return i + 2;
+}
+
+int rfc2047_decoder(const char *text,
+		    void (*callback)(const char *chset,
+				     const char *lang,
+				     const char *content,
+				     size_t cnt,
+				     void *dummy),
+		    void *ptr)
+{
+	ssize_t rc;
+
+	while (text && *text)
+	{
+		size_t i;
+
+		for (i=0; text[i]; i++)
+		{
+			if (text[i] == '=' && text[i+1] == '?')
+				break;
+		}
+
+		if (i)
+			(*callback)("iso-8859-1", "", text, i, ptr);
+
+		text += i;
+
+		if (!*text)
+			continue;
+
+		rc=rfc822_decode_rfc2047_atom(text, strlen(text),
+					      callback, ptr);
+
+		if (rc < 0)
+			return -1;
+
+		if (rc == 0)
+		{
+			(*callback)("iso-8859-1", "", text, 2, ptr);
+			text += 2;
+			continue;
+		}
+
+		text += rc;
+
+		for (i=0; text[i]; i++)
+		{
+			if (strchr(" \t\r\n", text[i]) == NULL)
+				break;
+		}
+
+		if (text[i] != '=' || text[i+1] != '?')
+			continue;
+
+		rc=rfc822_decode_rfc2047_atom(text+i, strlen(text+i), NULL,
+					      NULL);
+
+		if (rc < 0)
+			return -1;
+		if (rc > 0)
+			text += i;
+	}
+
+	return 0;
+}
+
+static int rfc2047_decode_unicode(const char *text,
+				  const char *chset,
+				  void (*callback)(const char *, size_t,
+						   void *),
+				  void *ptr)
+{
+	struct rfc822_display_name_s s;
+
+	s.chset=chset;
+	s.print_func=callback;
+	s.ptr=ptr;
+
+	return rfc2047_decoder(text, rfc822_display_addr_cb, &s);
+}