--- /dev/null
+#include "webcit.h"
+#ifdef HAVE_ICONV
+
+/*
+ * Wrapper around iconv_open()
+ * Our version adds aliases for non-standard Microsoft charsets
+ * such as 'MS950', aliasing them to names like 'CP950'
+ *
+ * tocode Target encoding
+ * fromcode Source encoding
+ */
+iconv_t ctdl_iconv_open(const char *tocode, const char *fromcode)
+{
+ iconv_t ic = (iconv_t)(-1) ;
+ ic = iconv_open(tocode, fromcode);
+ if (ic == (iconv_t)(-1) ) {
+ char alias_fromcode[64];
+ if ( (strlen(fromcode) == 5) && (!strncasecmp(fromcode, "MS", 2)) ) {
+ safestrncpy(alias_fromcode, fromcode, sizeof alias_fromcode);
+ alias_fromcode[0] = 'C';
+ alias_fromcode[1] = 'P';
+ ic = iconv_open(tocode, alias_fromcode);
+ }
+ }
+ return(ic);
+}
+
+
+
+inline char *FindNextEnd (char *bptr)
+{
+ char * end;
+ /* Find the next ?Q? */
+ end = strchr(bptr + 2, '?');
+ if (end == NULL) return NULL;
+ if (((*(end + 1) == 'B') || (*(end + 1) == 'Q')) &&
+ (*(end + 2) == '?')) {
+ /* skip on to the end of the cluster, the next ?= */
+ end = strstr(end + 3, "?=");
+ }
+ else
+ /* sort of half valid encoding, try to find an end. */
+ end = strstr(bptr, "?=");
+ return end;
+}
+
+/*
+ * Handle subjects with RFC2047 encoding such as:
+ * =?koi8-r?B?78bP0s3Mxc7JxSDXz9rE1dvO2c3JINvB0sHNySDP?=
+ */
+void utf8ify_rfc822_string(char *buf) {
+ char *start, *end, *next, *nextend, *ptr;
+ char newbuf[1024];
+ char charset[128];
+ char encoding[16];
+ char istr[1024];
+ iconv_t ic = (iconv_t)(-1) ;
+ char *ibuf; /**< Buffer of characters to be converted */
+ char *obuf; /**< Buffer for converted characters */
+ size_t ibuflen; /**< Length of input buffer */
+ size_t obuflen; /**< Length of output buffer */
+ char *isav; /**< Saved pointer to input buffer */
+ char *osav; /**< Saved pointer to output buffer */
+ int passes = 0;
+ int i, len, delta;
+ int illegal_non_rfc2047_encoding = 0;
+
+ /* Sometimes, badly formed messages contain strings which were simply
+ * written out directly in some foreign character set instead of
+ * using RFC2047 encoding. This is illegal but we will attempt to
+ * handle it anyway by converting from a user-specified default
+ * charset to UTF-8 if we see any nonprintable characters.
+ */
+ len = strlen(buf);
+ for (i=0; i<len; ++i) {
+ if ((buf[i] < 32) || (buf[i] > 126)) {
+ illegal_non_rfc2047_encoding = 1;
+ i = len; ///< take a shortcut, it won't be more than one.
+ }
+ }
+ if (illegal_non_rfc2047_encoding) {
+ StrBuf *default_header_charset;
+ get_preference("default_header_charset", &default_header_charset);
+ if ( (strcasecmp(ChrPtr(default_header_charset), "UTF-8")) &&
+ (strcasecmp(ChrPtr(default_header_charset), "us-ascii")) ) {
+ ic = ctdl_iconv_open("UTF-8", ChrPtr(default_header_charset));
+ if (ic != (iconv_t)(-1) ) {
+ ibuf = malloc(1024);
+ isav = ibuf;
+ safestrncpy(ibuf, buf, 1024);
+ ibuflen = strlen(ibuf);
+ obuflen = 1024;
+ obuf = (char *) malloc(obuflen);
+ osav = obuf;
+ iconv(ic, &ibuf, &ibuflen, &obuf, &obuflen);
+ osav[1024-obuflen] = 0;
+ strcpy(buf, osav);
+ free(osav);
+ iconv_close(ic);
+ free(isav);
+ }
+ }
+ }
+
+ /* pre evaluate the first pair */
+ nextend = end = NULL;
+ len = strlen(buf);
+ start = strstr(buf, "=?");
+ if (start != NULL)
+ end = FindNextEnd (start);
+
+ while ((start != NULL) && (end != NULL))
+ {
+ next = strstr(end, "=?");
+ if (next != NULL)
+ nextend = FindNextEnd(next);
+ if (nextend == NULL)
+ next = NULL;
+
+ /* did we find two partitions */
+ if ((next != NULL) &&
+ ((next - end) > 2))
+ {
+ ptr = end + 2;
+ while ((ptr < next) &&
+ (isspace(*ptr) ||
+ (*ptr == '\r') ||
+ (*ptr == '\n') ||
+ (*ptr == '\t')))
+ ptr ++;
+ /* did we find a gab just filled with blanks? */
+ if (ptr == next)
+ {
+ memmove (end + 2,
+ next,
+ len - (next - start));
+
+ /* now terminate the gab at the end */
+ delta = (next - end) - 2;
+ len -= delta;
+ buf[len] = '\0';
+
+ /* move next to its new location. */
+ next -= delta;
+ nextend -= delta;
+ }
+ }
+ /* our next-pair is our new first pair now. */
+ start = next;
+ end = nextend;
+ }
+
+ /* Now we handle foreign character sets properly encoded
+ * in RFC2047 format.
+ */
+ while (start=strstr(buf, "=?"), end=FindNextEnd((start != NULL)? start : buf),
+ ((start != NULL) && (end != NULL) && (end > start)) )
+ {
+ extract_token(charset, start, 1, '?', sizeof charset);
+ extract_token(encoding, start, 2, '?', sizeof encoding);
+ extract_token(istr, start, 3, '?', sizeof istr);
+
+ ibuf = malloc(1024);
+ isav = ibuf;
+ if (!strcasecmp(encoding, "B")) { /**< base64 */
+ ibuflen = CtdlDecodeBase64(ibuf, istr, strlen(istr));
+ }
+ else if (!strcasecmp(encoding, "Q")) { /**< quoted-printable */
+ size_t len;
+ long pos;
+
+ len = strlen(istr);
+ pos = 0;
+ while (pos < len)
+ {
+ if (istr[pos] == '_') istr[pos] = ' ';
+ pos++;
+ }
+
+ ibuflen = CtdlDecodeQuotedPrintable(ibuf, istr, len);
+ }
+ else {
+ strcpy(ibuf, istr); /**< unknown encoding */
+ ibuflen = strlen(istr);
+ }
+
+ ic = ctdl_iconv_open("UTF-8", charset);
+ if (ic != (iconv_t)(-1) ) {
+ obuflen = 1024;
+ obuf = (char *) malloc(obuflen);
+ osav = obuf;
+ iconv(ic, &ibuf, &ibuflen, &obuf, &obuflen);
+ osav[1024-obuflen] = 0;
+
+ end = start;
+ end++;
+ strcpy(start, "");
+ remove_token(end, 0, '?');
+ remove_token(end, 0, '?');
+ remove_token(end, 0, '?');
+ remove_token(end, 0, '?');
+ strcpy(end, &end[1]);
+
+ snprintf(newbuf, sizeof newbuf, "%s%s%s", buf, osav, end);
+ strcpy(buf, newbuf);
+ free(osav);
+ iconv_close(ic);
+ }
+ else {
+ end = start;
+ end++;
+ strcpy(start, "");
+ remove_token(end, 0, '?');
+ remove_token(end, 0, '?');
+ remove_token(end, 0, '?');
+ remove_token(end, 0, '?');
+ strcpy(end, &end[1]);
+
+ snprintf(newbuf, sizeof newbuf, "%s(unreadable)%s", buf, end);
+ strcpy(buf, newbuf);
+ }
+
+ free(isav);
+
+ /*
+ * Since spammers will go to all sorts of absurd lengths to get their
+ * messages through, there are LOTS of corrupt headers out there.
+ * So, prevent a really badly formed RFC2047 header from throwing
+ * this function into an infinite loop.
+ */
+ ++passes;
+ if (passes > 20) return;
+ }
+
+}
+#else
+inline void utf8ify_rfc822_string(char *a){};
+
+#endif
+
+
+
+
+/**
+ * \brief RFC2047-encode a header field if necessary.
+ * If no non-ASCII characters are found, the string
+ * will be copied verbatim without encoding.
+ *
+ * \param target Target buffer.
+ * \param maxlen Maximum size of target buffer.
+ * \param source Source string to be encoded.
+ * \param SourceLen Length of the source string
+ * \returns encoded length; -1 if non success.
+ */
+int webcit_rfc2047encode(char *target, int maxlen, char *source, long SourceLen)
+{
+ const char headerStr[] = "=?UTF-8?Q?";
+ int need_to_encode = 0;
+ int i = 0;
+ int len;
+ unsigned char ch;
+
+ if ((source == NULL) ||
+ (target == NULL) ||
+ (SourceLen > maxlen)) return -1;
+
+ while ((!IsEmptyStr (&source[i])) &&
+ (need_to_encode == 0) &&
+ (i < SourceLen) ) {
+ if (((unsigned char) source[i] < 32) ||
+ ((unsigned char) source[i] > 126)) {
+ need_to_encode = 1;
+ }
+ i++;
+ }
+
+ if (!need_to_encode) {
+ memcpy (target, source, SourceLen);
+ target[SourceLen] = '\0';
+ return SourceLen;
+ }
+
+ if (sizeof (headerStr + SourceLen + 2) > maxlen)
+ return -1;
+ memcpy (target, headerStr, sizeof (headerStr));
+ len = sizeof (headerStr) - 1;
+ for (i=0; (i < SourceLen) && (len + 3< maxlen) ; ++i) {
+ ch = (unsigned char) source[i];
+ if ((ch < 32) || (ch > 126) || (ch == 61)) {
+ sprintf(&target[len], "=%02X", ch);
+ len += 3;
+ }
+ else {
+ sprintf(&target[len], "%c", ch);
+ len ++;
+ }
+ }
+
+ if (len + 2 < maxlen) {
+ strcat(&target[len], "?=");
+ len +=2;
+ return len;
+ }
+ else
+ return -1;
+}
+
projects / citadel.git / blobdiff