/*
* This file is part of DisOrder
- * Copyright (C) 2005 Richard Kettlewell
+ * Copyright (C) 2005, 2007, 2008 Richard Kettlewell
*
- * This program is free software; you can redistribute it and/or modify
+ * This program 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
+ * the Free Software Foundation, either version 3 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.
- *
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- * USA
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+/** @file lib/mime.c
+ * @brief Support for MIME and allied protocols
*/
+#include "common.h"
-#include <config.h>
-#include "types.h"
-
-#include <string.h>
#include <ctype.h>
#include "mem.h"
#include "mime.h"
#include "vector.h"
#include "hex.h"
+#include "log.h"
+#include "base64.h"
+#include "kvp.h"
+/** @brief Match whitespace characters */
static int whitespace(int c) {
switch(c) {
case ' ':
}
}
-static int tspecial(int c) {
+/** @brief Match RFC2045 tspecial characters */
+int mime_tspecial(int c) {
+ switch(c) {
+ case '(':
+ case ')':
+ case '<':
+ case '>':
+ case '@':
+ case ',':
+ case ';':
+ case ':':
+ case '\\':
+ case '"':
+ case '/':
+ case '[':
+ case ']':
+ case '?':
+ case '=':
+ return 1;
+ default:
+ return 0;
+ }
+}
+
+/** @brief Match RFC2616 separator characters */
+int mime_http_separator(int c) {
switch(c) {
case '(':
case ')':
case ']':
case '?':
case '=':
+ case '{':
+ case '}':
+ case ' ':
+ case '\t':
return 1;
default:
return 0;
}
}
-static const char *skipwhite(const char *s) {
+/** @brief Match CRLF */
+static int iscrlf(const char *ptr) {
+ return ptr[0] == '\r' && ptr[1] == '\n';
+}
+
+/** @brief Skip whitespace
+ * @param s Pointer into string
+ * @param rfc822_comments If true, skip RFC822 nested comments
+ * @return Pointer into string after whitespace
+ */
+static const char *skipwhite(const char *s, int rfc822_comments) {
int c, depth;
for(;;) {
++s;
break;
case '(':
+ if(!rfc822_comments)
+ return s;
++s;
depth = 1;
while(*s && depth) {
case '(': ++depth; break;
case ')': --depth; break;
case '\\':
- if(!*s) return 0;
+ if(!*s)
+ return 0;
++s;
break;
}
}
- if(depth) return 0;
+ if(depth)
+ return 0;
break;
default:
return s;
}
}
-static const char *parsestring(const char *s, char **valuep) {
- struct dynstr value;
+/** @brief Test for a word character
+ * @param c Character to test
+ * @param special mime_tspecial() (MIME/RFC2405) or mime_http_separator() (HTTP/RFC2616)
+ * @return 1 if @p c is a word character, else 0
+ */
+static int iswordchar(int c, int (*special)(int)) {
+ return !(c <= ' ' || c > '~' || special(c));
+}
+
+/** @brief Parse an RFC1521/RFC2616 word
+ * @param s Pointer to start of word
+ * @param valuep Where to store value
+ * @param special mime_tspecial() (MIME/RFC2405) or mime_http_separator() (HTTP/RFC2616)
+ * @return Pointer just after end of word or NULL if there's no word
+ *
+ * A word is a token or a quoted-string.
+ */
+const char *mime_parse_word(const char *s, char **valuep,
+ int (*special)(int)) {
+ struct dynstr value[1];
int c;
- dynstr_init(&value);
- ++s;
- while((c = *s++) != '"') {
- switch(c) {
- case '\\':
- if(!(c = *s++)) return 0;
- default:
- dynstr_append(&value, c);
- break;
+ dynstr_init(value);
+ if(*s == '"') {
+ ++s;
+ while((c = *s++) != '"') {
+ switch(c) {
+ case '\\':
+ if(!(c = *s++))
+ return 0;
+ default:
+ dynstr_append(value, c);
+ break;
+ }
}
+ if(!c)
+ return 0;
+ } else {
+ if(!iswordchar((unsigned char)*s, special))
+ return NULL;
+ dynstr_init(value);
+ while(iswordchar((unsigned char)*s, special))
+ dynstr_append(value, *s++);
}
- if(!c) return 0;
- dynstr_terminate(&value);
- *valuep = value.vec;
+ dynstr_terminate(value);
+ *valuep = value->vec;
return s;
}
+/** @brief Parse an RFC1521/RFC2616 token
+ * @param s Pointer to start of token
+ * @param valuep Where to store value
+ * @param special mime_tspecial() (MIME/RFC2405) or mime_http_separator() (HTTP/RFC2616)
+ * @return Pointer just after end of token or NULL if there's no token
+ */
+static const char *parsetoken(const char *s, char **valuep,
+ int (*special)(int)) {
+ if(*s == '"')
+ return 0;
+ return mime_parse_word(s, valuep, special);
+}
+
+/** @brief Parse a MIME content-type field
+ * @param s Start of field
+ * @param typep Where to store type
+ * @param parametersp Where to store parameter list
+ * @return 0 on success, non-0 on error
+ *
+ * See <a href="http://tools.ietf.org/html/rfc2045#section-5">RFC 2045 s5</a>.
+ */
int mime_content_type(const char *s,
char **typep,
- char **parameternamep,
- char **parametervaluep) {
- struct dynstr type, parametername, parametervalue;
+ struct kvp **parametersp) {
+ struct dynstr type, parametername;
+ struct kvp *parameters = 0;
+ char *parametervalue;
dynstr_init(&type);
- if(!(s = skipwhite(s))) return -1;
- if(!*s) return -1;
- while(*s && !tspecial(*s) && !whitespace(*s))
+ if(!(s = skipwhite(s, 1)))
+ return -1;
+ if(!*s)
+ return -1;
+ while(*s && !mime_tspecial(*s) && !whitespace(*s))
dynstr_append(&type, tolower((unsigned char)*s++));
- if(!(s = skipwhite(s))) return -1;
- if(*s++ != '/') return -1;
+ if(!(s = skipwhite(s, 1)))
+ return -1;
+ if(*s++ != '/')
+ return -1;
dynstr_append(&type, '/');
- if(!(s = skipwhite(s))) return -1;
- while(*s && !tspecial(*s) && !whitespace(*s))
+ if(!(s = skipwhite(s, 1)))
+ return -1;
+ while(*s && !mime_tspecial(*s) && !whitespace(*s))
dynstr_append(&type, tolower((unsigned char)*s++));
- if(!(s = skipwhite(s))) return -1;
+ if(!(s = skipwhite(s, 1)))
+ return -1;
- if(*s == ';') {
+ while(*s == ';') {
dynstr_init(¶metername);
++s;
- if(!(s = skipwhite(s))) return -1;
- if(!*s) return -1;
- while(*s && !tspecial(*s) && !whitespace(*s))
+ if(!(s = skipwhite(s, 1)))
+ return -1;
+ if(!*s)
+ return -1;
+ while(*s && !mime_tspecial(*s) && !whitespace(*s))
dynstr_append(¶metername, tolower((unsigned char)*s++));
- if(!(s = skipwhite(s))) return -1;
- if(*s++ != '=') return -1;
- if(!(s = skipwhite(s))) return -1;
- if(*s == '"') {
- if(!(s = parsestring(s, parametervaluep))) return -1;
- } else {
- dynstr_init(¶metervalue);
- while(*s && !tspecial(*s) && !whitespace(*s))
- dynstr_append(¶metervalue, *s++);
- dynstr_terminate(¶metervalue);
- *parametervaluep = parametervalue.vec;
- }
- if(!(s = skipwhite(s))) return -1;
+ if(!(s = skipwhite(s, 1)))
+ return -1;
+ if(*s++ != '=')
+ return -1;
+ if(!(s = skipwhite(s, 1)))
+ return -1;
+ if(!(s = mime_parse_word(s, ¶metervalue, mime_tspecial)))
+ return -1;
+ if(!(s = skipwhite(s, 1)))
+ return -1;
dynstr_terminate(¶metername);
- *parameternamep = parametername.vec;
- } else
- *parametervaluep = *parameternamep = 0;
+ kvp_set(¶meters, parametername.vec, parametervalue);
+ }
dynstr_terminate(&type);
*typep = type.vec;
+ *parametersp = parameters;
return 0;
}
-static int iscrlf(const char *ptr) {
- return ptr[0] == '\r' && ptr[1] == '\n';
-}
-
+/** @brief Parse a MIME message
+ * @param s Start of message
+ * @param callback Called for each header field
+ * @param u Passed to callback
+ * @return Pointer to decoded body (might be in original string), or NULL on error
+ *
+ * This does an RFC 822-style parse and honors Content-Transfer-Encoding as
+ * described in <a href="http://tools.ietf.org/html/rfc2045#section-6">RFC 2045
+ * s6</a>. @p callback is called for each header field encountered, in order,
+ * with ASCII characters in the header name forced to lower case.
+ */
const char *mime_parse(const char *s,
int (*callback)(const char *name, const char *value,
void *u),
while(*s && !iscrlf(s)) {
dynstr_init(&name);
dynstr_init(&value);
- while(*s && !tspecial(*s) && !whitespace(*s))
+ while(*s && !mime_tspecial(*s) && !whitespace(*s))
dynstr_append(&name, tolower((unsigned char)*s++));
- if(!(s = skipwhite(s))) return 0;
- if(*s != ':') return 0;
+ if(!(s = skipwhite(s, 1)))
+ return 0;
+ if(*s != ':')
+ return 0;
++s;
- while(*s && !(*s == '\n' && !(s[1] == ' ' || s[1] == '\t')))
- dynstr_append(&value, *s++);
- if(*s) ++s;
+ while(*s && !(*s == '\n' && !(s[1] == ' ' || s[1] == '\t'))) {
+ const int c = *s++;
+ /* Strip leading whitespace */
+ if(value.nvec || !(c == ' ' || c == '\t' || c == '\n' || c == '\r'))
+ dynstr_append(&value, c);
+ }
+ /* Strip trailing whitespace */
+ while(value.nvec > 0 && (value.vec[value.nvec - 1] == ' '
+ || value.vec[value.nvec - 1] == '\t'
+ || value.vec[value.nvec - 1] == '\n'
+ || value.vec[value.nvec - 1] == '\r'))
+ --value.nvec;
+ if(*s)
+ ++s;
dynstr_terminate(&name);
dynstr_terminate(&value);
if(!strcmp(name.vec, "content-transfer-encoding")) {
for(p = cte; *p; p++)
*p = tolower((unsigned char)*p);
}
- if(callback(name.vec, value.vec, u)) return 0;
+ if(callback(name.vec, value.vec, u))
+ return 0;
}
- if(*s) s += 2;
+ if(*s)
+ s += 2;
if(cte) {
- if(!strcmp(cte, "base64")) return mime_base64(s);
- if(!strcmp(cte, "quoted-printable")) return mime_qp(s);
+ if(!strcmp(cte, "base64"))
+ return mime_base64(s, 0);
+ if(!strcmp(cte, "quoted-printable"))
+ return mime_qp(s);
+ if(!strcmp(cte, "7bit") || !strcmp(cte, "8bit"))
+ return s;
+ disorder_error(0, "unknown content-transfer-encoding '%s'", cte);
+ return 0;
}
return s;
}
+/** @brief Match the boundary string */
static int isboundary(const char *ptr, const char *boundary, size_t bl) {
return (ptr[0] == '-'
&& ptr[1] == '-'
&& (iscrlf(ptr + bl + 2)
|| (ptr[bl + 2] == '-'
&& ptr[bl + 3] == '-'
- && iscrlf(ptr + bl + 4))));
+ && (iscrlf(ptr + bl + 4) || *(ptr + bl + 4) == 0))));
}
+/** @brief Match the final boundary string */
static int isfinal(const char *ptr, const char *boundary, size_t bl) {
return (ptr[0] == '-'
&& ptr[1] == '-'
&& !strncmp(ptr + 2, boundary, bl)
&& ptr[bl + 2] == '-'
&& ptr[bl + 3] == '-'
- && iscrlf(ptr + bl + 4));
+ && (iscrlf(ptr + bl + 4) || *(ptr + bl + 4) == 0));
}
+/** @brief Parse a multipart MIME body
+ * @param s Start of message
+ * @param callback Callback for each part
+ * @param boundary Boundary string
+ * @param u Passed to callback
+ * @return 0 on success, non-0 on error
+ *
+ * See <a href="http://tools.ietf.org/html/rfc2046#section-5.1">RFC 2046
+ * s5.1</a>. @p callback is called for each part (not yet decoded in any way)
+ * in succession; you should probably call mime_parse() for each part.
+ */
int mime_multipart(const char *s,
int (*callback)(const char *s, void *u),
const char *boundary,
const char *start, *e;
int ret;
- if(!isboundary(s, boundary, bl)) return -1;
+ /* We must start with a boundary string */
+ if(!isboundary(s, boundary, bl)) {
+ disorder_error(0, "mime_multipart: first line is not the boundary string");
+ return -1;
+ }
+ /* Keep going until we hit a final boundary */
while(!isfinal(s, boundary, bl)) {
s = strstr(s, "\r\n") + 2;
start = s;
while(!isboundary(s, boundary, bl)) {
- if(!(e = strstr(s, "\r\n"))) return -1;
+ if(!(e = strstr(s, "\r\n"))) {
+ disorder_error(0, "mime_multipart: line does not end CRLF");
+ return -1;
+ }
s = e + 2;
}
if((ret = callback(xstrndup(start,
return 0;
}
+/** @brief Parse an RFC2388-style content-disposition field
+ * @param s Start of field
+ * @param dispositionp Where to store disposition
+ * @param parameternamep Where to store parameter name
+ * @param parametervaluep Wher to store parameter value
+ * @return 0 on success, non-0 on error
+ *
+ * See <a href="http://tools.ietf.org/html/rfc2388#section-3">RFC 2388 s3</a>
+ * and <a href="http://tools.ietf.org/html/rfc2183">RFC 2183</a>.
+ */
int mime_rfc2388_content_disposition(const char *s,
char **dispositionp,
char **parameternamep,
char **parametervaluep) {
- struct dynstr disposition, parametername, parametervalue;
+ struct dynstr disposition, parametername;
dynstr_init(&disposition);
- if(!(s = skipwhite(s))) return -1;
- if(!*s) return -1;
- while(*s && !tspecial(*s) && !whitespace(*s))
+ if(!(s = skipwhite(s, 1)))
+ return -1;
+ if(!*s)
+ return -1;
+ while(*s && !mime_tspecial(*s) && !whitespace(*s))
dynstr_append(&disposition, tolower((unsigned char)*s++));
- if(!(s = skipwhite(s))) return -1;
+ if(!(s = skipwhite(s, 1)))
+ return -1;
if(*s == ';') {
dynstr_init(¶metername);
++s;
- if(!(s = skipwhite(s))) return -1;
- if(!*s) return -1;
- while(*s && !tspecial(*s) && !whitespace(*s))
+ if(!(s = skipwhite(s, 1)))
+ return -1;
+ if(!*s)
+ return -1;
+ while(*s && !mime_tspecial(*s) && !whitespace(*s))
dynstr_append(¶metername, tolower((unsigned char)*s++));
- if(!(s = skipwhite(s))) return -1;
- if(*s++ != '=') return -1;
- if(!(s = skipwhite(s))) return -1;
- if(*s == '"') {
- if(!(s = parsestring(s, parametervaluep))) return -1;
- } else {
- dynstr_init(¶metervalue);
- while(*s && !tspecial(*s) && !whitespace(*s))
- dynstr_append(¶metervalue, *s++);
- dynstr_terminate(¶metervalue);
- *parametervaluep = parametervalue.vec;
- }
- if(!(s = skipwhite(s))) return -1;
+ if(!(s = skipwhite(s, 1)))
+ return -1;
+ if(*s++ != '=')
+ return -1;
+ if(!(s = skipwhite(s, 1)))
+ return -1;
+ if(!(s = mime_parse_word(s, parametervaluep, mime_tspecial)))
+ return -1;
+ if(!(s = skipwhite(s, 1)))
+ return -1;
dynstr_terminate(¶metername);
*parameternamep = parametername.vec;
} else
return 0;
}
+/** @brief Convert MIME quoted-printable
+ * @param s Quoted-printable data
+ * @return Decoded data
+ *
+ * See <a href="http://tools.ietf.org/html/rfc2045#section-6.7">RFC 2045
+ * s6.7</a>.
+ */
char *mime_qp(const char *s) {
struct dynstr d;
int c, a, b;
return d.vec;
}
-char *mime_base64(const char *s) {
- struct dynstr d;
- const char *t;
- int b[4], n, c;
- static const char table[] =
- "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+/** @brief Match cookie separator characters
+ *
+ * This is a subset of the RFC2616 specials, and technically is in breach of
+ * the specification. However rejecting (in particular) slashes is
+ * unreasonably strict and has broken at least one (admittedly somewhat
+ * obscure) browser, so we're more forgiving.
+ */
+static int cookie_separator(int c) {
+ switch(c) {
+ case '(':
+ case ')':
+ case ',':
+ case ';':
+ case '=':
+ case ' ':
+ case '"':
+ case '\t':
+ return 1;
- dynstr_init(&d);
- n = 0;
- while((c = (unsigned char)*s++)) {
- if((t = strchr(table, c))) {
- b[n++] = t - table;
- if(n == 4) {
- dynstr_append(&d, (b[0] << 2) + (b[1] >> 4));
- dynstr_append(&d, (b[1] << 4) + (b[2] >> 2));
- dynstr_append(&d, (b[2] << 6) + b[3]);
- n = 0;
- }
- } else if(c == '=') {
- if(n >= 2) {
- dynstr_append(&d, (b[0] << 2) + (b[1] >> 4));
- if(n == 3)
- dynstr_append(&d, (b[1] << 4) + (b[2] >> 2));
+ default:
+ return 0;
+ }
+}
+
+/** @brief Match cookie value separator characters
+ *
+ * Same as cookie_separator() but allows for @c = in cookie values.
+ */
+static int cookie_value_separator(int c) {
+ switch(c) {
+ case '(':
+ case ')':
+ case ',':
+ case ';':
+ case ' ':
+ case '"':
+ case '\t':
+ return 1;
+
+ default:
+ return 0;
+ }
+}
+
+/** @brief Parse a RFC2109 Cookie: header
+ * @param s Header field value
+ * @param cd Where to store result
+ * @return 0 on success, non-0 on error
+ *
+ * See <a href="http://tools.ietf.org/html/rfc2109">RFC 2109</a>.
+ */
+int parse_cookie(const char *s,
+ struct cookiedata *cd) {
+ char *n = 0, *v = 0;
+
+ memset(cd, 0, sizeof *cd);
+ s = skipwhite(s, 0);
+ while(*s) {
+ /* Skip separators */
+ if(*s == ';' || *s == ',') {
+ ++s;
+ s = skipwhite(s, 0);
+ continue;
+ }
+ if(!(s = parsetoken(s, &n, cookie_separator))) {
+ disorder_error(0, "parse_cookie: cannot parse attribute name");
+ return -1;
+ }
+ s = skipwhite(s, 0);
+ if(*s++ != '=') {
+ disorder_error(0, "parse_cookie: did not find expected '='");
+ return -1;
+ }
+ s = skipwhite(s, 0);
+ if(!(s = mime_parse_word(s, &v, cookie_value_separator))) {
+ disorder_error(0, "parse_cookie: cannot parse value for '%s'", n);
+ return -1;
+ }
+ if(n[0] == '$') {
+ /* Some bit of meta-information */
+ if(!strcmp(n, "$Version"))
+ cd->version = v;
+ else if(!strcmp(n, "$Path")) {
+ if(cd->ncookies > 0 && cd->cookies[cd->ncookies-1].path == 0)
+ cd->cookies[cd->ncookies-1].path = v;
+ else {
+ disorder_error(0, "redundant $Path in Cookie: header");
+ return -1;
+ }
+ } else if(!strcmp(n, "$Domain")) {
+ if(cd->ncookies > 0 && cd->cookies[cd->ncookies-1].domain == 0)
+ cd->cookies[cd->ncookies-1].domain = v;
+ else {
+ disorder_error(0, "redundant $Domain in Cookie: header");
+ return -1;
+ }
}
- break;
+ } else {
+ /* It's a new cookie */
+ cd->cookies = xrealloc(cd->cookies,
+ (cd->ncookies + 1) * sizeof (struct cookie));
+ cd->cookies[cd->ncookies].name = n;
+ cd->cookies[cd->ncookies].value = v;
+ cd->cookies[cd->ncookies].path = 0;
+ cd->cookies[cd->ncookies].domain = 0;
+ ++cd->ncookies;
+ }
+ s = skipwhite(s, 0);
+ if(*s && (*s != ',' && *s != ';')) {
+ disorder_error(0, "missing separator in Cookie: header");
+ return -1;
}
}
- dynstr_terminate(&d);
- return d.vec;
+ return 0;
+}
+
+/** @brief Find a named cookie
+ * @param cd Parse cookie data
+ * @param name Name of cookie
+ * @return Cookie structure or NULL if not found
+ */
+const struct cookie *find_cookie(const struct cookiedata *cd,
+ const char *name) {
+ int n;
+
+ for(n = 0; n < cd->ncookies; ++n)
+ if(!strcmp(cd->cookies[n].name, name))
+ return &cd->cookies[n];
+ return 0;
+}
+
+/** @brief RFC822 quoting
+ * @param s String to quote
+ * @param force If non-0, always quote
+ * @return Possibly quoted string
+ */
+char *quote822(const char *s, int force) {
+ const char *t;
+ struct dynstr d[1];
+ int c;
+
+ if(!force) {
+ /* See if we need to quote */
+ for(t = s; (c = (unsigned char)*t); ++t) {
+ if(mime_tspecial(c) || mime_http_separator(c) || whitespace(c))
+ break;
+ }
+ if(*t)
+ force = 1;
+ }
+
+ if(!force)
+ return xstrdup(s);
+
+ dynstr_init(d);
+ dynstr_append(d, '"');
+ for(t = s; (c = (unsigned char)*t); ++t) {
+ if(c == '"' || c == '\\')
+ dynstr_append(d, '\\');
+ dynstr_append(d, c);
+ }
+ dynstr_append(d, '"');
+ dynstr_terminate(d);
+ return d->vec;
+}
+
+/** @brief Return true if @p ptr points at trailing space */
+static int is_trailing_space(const char *ptr) {
+ if(*ptr == ' ' || *ptr == '\t') {
+ while(*ptr == ' ' || *ptr == '\t')
+ ++ptr;
+ return *ptr == '\n' || *ptr == 0;
+ } else
+ return 0;
+}
+
+/** @brief Encoding text as quoted-printable
+ * @param text String to encode
+ * @return Encoded string
+ *
+ * See <a href="http://tools.ietf.org/html/rfc2045#section-6.7">RFC2045
+ * s6.7</a>.
+ */
+char *mime_to_qp(const char *text) {
+ struct dynstr d[1];
+ int linelength = 0; /* length of current line */
+ char buffer[10];
+
+ dynstr_init(d);
+ /* The rules are:
+ * 1. Anything except newline can be replaced with =%02X
+ * 2. Newline, 33-60 and 62-126 stand for themselves (i.e. not '=')
+ * 3. Non-trailing space/tab stand for themselves.
+ * 4. Output lines are limited to 76 chars, with =<newline> being used
+ * as a soft line break
+ * 5. Newlines aren't counted towards the 76 char limit.
+ */
+ while(*text) {
+ const int c = (unsigned char)*text;
+ if(c == '\n') {
+ /* Newline stands as itself */
+ dynstr_append(d, '\n');
+ linelength = 0;
+ } else if((c >= 33 && c <= 126 && c != '=')
+ || ((c == ' ' || c == '\t')
+ && !is_trailing_space(text))) {
+ /* Things that can stand for themselves */
+ dynstr_append(d, c);
+ ++linelength;
+ } else {
+ /* Anything else that needs encoding */
+ snprintf(buffer, sizeof buffer, "=%02X", c);
+ dynstr_append_string(d, buffer);
+ linelength += 3;
+ }
+ ++text;
+ if(linelength > 73 && *text && *text != '\n') {
+ /* Next character might overflow 76 character limit if encoded, so we
+ * insert a soft break */
+ dynstr_append_string(d, "=\n");
+ linelength = 0;
+ }
+ }
+ /* Ensure there is a final newline */
+ if(linelength)
+ dynstr_append(d, '\n');
+ /* That's all */
+ dynstr_terminate(d);
+ return d->vec;
+}
+
+/** @brief Encode text
+ * @param text Underlying UTF-8 text
+ * @param charsetp Where to store charset string
+ * @param encodingp Where to store encoding string
+ * @return Encoded text (might be @p text)
+ */
+const char *mime_encode_text(const char *text,
+ const char **charsetp,
+ const char **encodingp) {
+ const char *ptr;
+
+ /* See if there are in fact any non-ASCII characters */
+ for(ptr = text; *ptr; ++ptr)
+ if((unsigned char)*ptr >= 128)
+ break;
+ if(!*ptr) {
+ /* Plain old ASCII, no encoding required */
+ *charsetp = "us-ascii";
+ *encodingp = "7bit";
+ return text;
+ }
+ *charsetp = "utf-8";
+ *encodingp = "quoted-printable";
+ return mime_to_qp(text);
}
/*
~mdw / disorder / blobdiff