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175 lines
4.1 KiB
175 lines
4.1 KiB
diff --git a/mime.c b/mime.c
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index 45de80a..ecac85d 100644
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--- a/mime.c
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+++ b/mime.c
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@@ -1109,16 +1109,34 @@ fromhdr_end:
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}
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/*
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+ * return length of this UTF-8 codepoint in bytes
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+ */
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+static size_t
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+codepointsize(char tc)
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+{
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+ int rv = 0;
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+ if ( ! ( tc & 0x80 ) )
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+ return 1;
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+ while ( tc & 0x80 )
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+ {
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+ rv++;
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+ tc = tc<<1;
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+ }
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+ return rv;
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+}
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+
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+/*
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* Convert header fields to RFC 1522 format and write to the file fo.
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*/
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static size_t
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mime_write_tohdr(struct str *in, FILE *fo)
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{
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char *upper, *wbeg, *wend, *charset, *lastwordend = NULL, *lastspc, b,
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- *charset7;
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+ *charset7, *cp;
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struct str cin, cout;
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- size_t sz = 0, col = 0, wr, charsetlen, charset7len;
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+ size_t sz = 0, col = 0, wr, charsetlen, charset7len, cpsz;
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int quoteany, mustquote, broken,
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+ maxin, maxout, curin, cps,
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maxcol = 65 /* there is the header field's name, too */;
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upper = in->s + in->l;
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@@ -1134,41 +1152,75 @@ mime_write_tohdr(struct str *in, FILE *fo)
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if (mustquote_hdr(wbeg, wbeg == in->s, wbeg == &upper[-1]))
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quoteany++;
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}
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+
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+ /*
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+ * rfc2047 says we cannot split multi-byte characters over
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+ * encoded words, so we need to know if we're a multi-byte
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+ * source stream (UTF-8 specifically) or just an 8 bit
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+ * stream like ISO-8859-15
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+ * so test beginning of charset since it is valid to include
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+ * language in charset "UTF-8*DE" etc as per rfc 2184/2231
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+ */
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+ char *thisset = b&0200 ? charset : charset7;
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+ int is_utf8 = ( strncasecmp( thisset, "utf-8", 5 ) == 0 );
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+
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if (2 * quoteany > in->l) {
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/*
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* Print the entire field in base64.
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*/
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- for (wbeg = in->s; wbeg < upper; wbeg = wend) {
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+ for (wbeg = in->s; wbeg < upper; ) {
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wend = upper;
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cin.s = wbeg;
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- for (;;) {
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- cin.l = wend - wbeg;
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- if (cin.l * 4/3 + 7 + charsetlen
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- < maxcol - col) {
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- fprintf(fo, "=?%s?B?",
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- b&0200 ? charset : charset7);
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- wr = mime_write_tob64(&cin, fo, 1);
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- fwrite("?=", sizeof (char), 2, fo);
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- wr += 7 + charsetlen;
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- sz += wr, col += wr;
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- if (wend < upper) {
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- fwrite("\n ", sizeof (char),
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- 2, fo);
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- sz += 2;
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- col = 0;
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- maxcol = 76;
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+ /*
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+ * we calculate the maximum number of bytes
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+ * we can use on this output line, and then what
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+ * this equates to as base64 encoded source bytes
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+ */
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+ maxout = maxcol - col - 7 - charsetlen;
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+ maxin = (maxout - (maxout & 0x03)) * 3/4;
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+
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+ /* short enough to finish ? */
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+ if (maxin > upper - wbeg )
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+ {
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+ curin = upper - wbeg;
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+ wbeg += curin;
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+ }else
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+ {
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+ if (is_utf8)
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+ {
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+ /*
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+ * now scan the input from the beginning
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+ * to see how many codepoints will fit
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+ */
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+ curin = 0;
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+ while (curin < maxin
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+ && (cpsz = codepointsize(*wbeg)) <= (maxin - curin))
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+ {
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+ curin += cpsz;
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+ wbeg += cpsz;
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}
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- break;
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- } else {
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- if (col) {
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- fprintf(fo, "\n ");
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- sz += 2;
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- col = 0;
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- maxcol = 76;
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- } else
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- wend -= 4;
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+ }else
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+ {
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+ curin = maxin;
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+ wbeg += maxin;
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}
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}
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+ cin.l = curin;
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+ fprintf(fo, "%s=?%s?B?", (cin.s != in->s) ? " " : "", thisset );
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+ wr = mime_write_tob64(&cin, fo, 1);
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+
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+ if (wbeg < upper)
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+ {
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+ wr += fwrite("?=\n ", sizeof (char), 4, fo) * sizeof (char);
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+ }else
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+ {
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+ wr += fwrite("?=", sizeof (char), 2, fo) * sizeof (char);
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+ }
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+
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+ /* and shuffle pointers and counts */
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+ col = 1;
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+ maxcol = 76;
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+ sz += wr + 7 + charsetlen + ((cin.s != in->s) ? 1 : 0 );
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}
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} else {
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/*
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@@ -1243,7 +1295,29 @@ mime_write_tohdr(struct str *in, FILE *fo)
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maxcol -= wbeg -
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lastspc;
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} else {
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- wend -= 4;
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+ if (is_utf8)
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+ {
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+ /*
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+ * make sure wend is not pointing to
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+ * the middle of a codepoint
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+ */
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+ cp = wend;
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+ while (--cp > wbeg)
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+ {
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+ cps = codepointsize(*cp);
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+ if (cps > 1)
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+ {
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+ if (wend - cp - cps > 4)
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+ wend -= 4;
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+ else
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+ wend = cp;
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+ break;
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+ }
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+ }
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+ if (cp == wbeg)
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+ wend -= 4;
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+ } else
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+ wend -= 4;
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}
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free(cout.s);
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}
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