-
/*
- * fmt_rfc2047.c -- decode RFC-2047 header format
- *
- * $Id$
- *
- * This code is Copyright (c) 2002, by the authors of nmh. See the
- * COPYRIGHT file in the root directory of the nmh distribution for
- * complete copyright information.
- */
+** fmt_rfc2047.c -- decode RFC-2047 header format
+**
+** This code is Copyright (c) 2002, by the authors of nmh. See the
+** COPYRIGHT file in the root directory of the nmh distribution for
+** complete copyright information.
+*/
#include <h/mh.h>
#include <h/utils.h>
#endif
static signed char hexindex[] = {
- -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
- -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
- -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
- 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,-1,-1,-1,-1,-1,-1,
- -1,10,11,12,13,14,15,-1,-1,-1,-1,-1,-1,-1,-1,-1,
- -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
- -1,10,11,12,13,14,15,-1,-1,-1,-1,-1,-1,-1,-1,-1,
- -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1
+ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,-1,-1,-1,-1,-1,-1,
+ -1,10,11,12,13,14,15,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+ -1,10,11,12,13,14,15,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1
};
static signed char index_64[128] = {
- -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
- -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
- -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63,
- 52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1,-1,-1,-1,
- -1, 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,-1, -1,-1,-1,-1,
- -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
- 41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1
+ -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+ -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+ -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63,
+ 52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1,-1,-1,-1,
+ -1, 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,-1, -1,-1,-1,-1,
+ -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
+ 41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1
};
#define char64(c) (((unsigned char) (c) > 127) ? -1 : index_64[(unsigned char) (c)])
static int
-unqp (unsigned char byte1, unsigned char byte2)
+unqp(unsigned char byte1, unsigned char byte2)
{
- if (hexindex[byte1] == -1 || hexindex[byte2] == -1)
- return -1;
- return (hexindex[byte1] << 4 | hexindex[byte2]);
+ if (hexindex[byte1] == -1 || hexindex[byte2] == -1)
+ return -1;
+ return (hexindex[byte1] << 4 | hexindex[byte2]);
}
/* Check if character is linear whitespace */
/*
- * Decode the string as a RFC-2047 header field
- */
+** Decode the string as a RFC-2047 header field
+*/
/* Add character to the destination buffer, and bomb out if it fills up */
#define ADDCHR(C) do { *q++ = (C); dstlen--; if (!dstlen) goto buffull; } while (0)
int
-decode_rfc2047 (char *str, char *dst, size_t dstlen)
+decode_rfc2047(char *str, char *dst, size_t dstlen)
{
- char *p, *q, *pp;
- char *startofmime, *endofmime;
- int c, quoted_printable;
- int encoding_found = 0; /* did we decode anything? */
- int between_encodings = 0; /* are we between two encodings? */
- int equals_pending = 0; /* is there a '=' pending? */
- int whitespace = 0; /* how much whitespace between encodings? */
+ char *p, *q, *pp;
+ char *startofmime, *endofmime;
+ int c, quoted_printable;
+ int encoding_found = 0; /* did we decode anything? */
+ int between_encodings = 0; /* are we between two encodings? */
+ int equals_pending = 0; /* is there a '=' pending? */
+ int whitespace = 0; /* how much whitespace between encodings? */
#ifdef HAVE_ICONV
- int use_iconv = 0; /* are we converting encoding with iconv? */
- iconv_t cd = NULL;
- int fromutf8 = 0;
- char *saveq, *convbuf = NULL;
- size_t savedstlen;
+ int use_iconv = 0; /* are we converting encoding with iconv? */
+ iconv_t cd = NULL;
+ int fromutf8 = 0;
+ char *saveq, *convbuf = NULL;
+ size_t savedstlen;
#endif
- if (!str)
- return 0;
+ if (!str)
+ return 0;
- /*
- * Do a quick and dirty check for the '=' character.
- * This should quickly eliminate many cases.
- */
- if (!strchr (str, '='))
- return 0;
+ /*
+ ** Do a quick and dirty check for the '=' character.
+ ** This should quickly eliminate many cases.
+ */
+ if (!strchr(str, '='))
+ return 0;
- for (p = str, q = dst; *p; p++) {
+ for (p = str, q = dst; *p; p++) {
- /* reset iconv */
+ /* reset iconv */
#ifdef HAVE_ICONV
- if (use_iconv) {
- iconv_close(cd);
- use_iconv = 0;
- }
+ if (use_iconv) {
+ iconv_close(cd);
+ use_iconv = 0;
+ }
#endif
- /*
- * If we had an '=' character pending from
- * last iteration, then add it first.
- */
- if (equals_pending) {
- ADDCHR('=');
- equals_pending = 0;
- between_encodings = 0; /* we have added non-whitespace text */
- }
+ /*
+ ** If we had an '=' character pending from
+ ** last iteration, then add it first.
+ */
+ if (equals_pending) {
+ ADDCHR('=');
+ equals_pending = 0;
+ between_encodings = 0; /* we have added non-whitespace text */
+ }
- if (*p != '=') {
- /* count linear whitespace while between encodings */
- if (between_encodings && is_lws(*p))
- whitespace++;
- else
- between_encodings = 0; /* we have added non-whitespace text */
- ADDCHR(*p);
- continue;
- }
+ if (*p != '=') {
+ /* count linear whitespace while between encodings */
+ if (between_encodings && is_lws(*p))
+ whitespace++;
+ else
+ between_encodings = 0; /* we have added non-whitespace text */
+ ADDCHR(*p);
+ continue;
+ }
- equals_pending = 1; /* we have a '=' pending */
+ equals_pending = 1; /* we have a '=' pending */
- /* Check for initial =? */
- if (*p == '=' && p[1] && p[1] == '?' && p[2]) {
- startofmime = p + 2;
+ /* Check for initial =? */
+ if (*p == '=' && p[1] && p[1] == '?' && p[2]) {
+ startofmime = p + 2;
- /* Scan ahead for the next '?' character */
- for (pp = startofmime; *pp && *pp != '?'; pp++)
- ;
+ /* Scan ahead for the next '?' character */
+ for (pp = startofmime; *pp && *pp != '?'; pp++)
+ ;
- if (!*pp)
- continue;
+ if (!*pp)
+ continue;
+ *pp = '\0';
- /* Check if character set can be handled natively */
- if (!check_charset(startofmime, pp - startofmime)) {
+ /* Check if character set can be handled natively */
+ if (!is_native_charset(startofmime)) {
#ifdef HAVE_ICONV
- /* .. it can't. We'll use iconv then. */
- *pp = '\0';
- cd = iconv_open(get_charset(), startofmime);
- fromutf8 = !mh_strcasecmp(startofmime, "UTF-8");
- *pp = '?';
- if (cd == (iconv_t)-1) continue;
- use_iconv = 1;
+ /* .. it can't. We'll use iconv then. */
+ cd = iconv_open(get_charset(), startofmime);
+ fromutf8 = !mh_strcasecmp(startofmime, "UTF-8");
+ *pp = '?';
+ if (cd == (iconv_t)-1)
+ continue;
+ use_iconv = 1;
#else
- continue;
+ *pp = '?';
+ continue;
#endif
- }
-
- startofmime = pp + 1;
-
- /* Check for valid encoding type */
- if (*startofmime != 'B' && *startofmime != 'b' &&
- *startofmime != 'Q' && *startofmime != 'q')
- continue;
-
- /* Is encoding quoted printable or base64? */
- quoted_printable = (*startofmime == 'Q' || *startofmime == 'q');
- startofmime++;
-
- /* Check for next '?' character */
- if (*startofmime != '?')
- continue;
- startofmime++;
-
- /*
- * Scan ahead for the ending ?=
- *
- * While doing this, we will also check if encoded
- * word has any embedded linear whitespace.
- */
- endofmime = NULL;
- for (pp = startofmime; *pp && *(pp+1); pp++) {
- if (is_lws(*pp)) {
- break;
- } else if (*pp == '?' && pp[1] == '=') {
- endofmime = pp;
- break;
- }
- }
- if (is_lws(*pp) || endofmime == NULL)
- continue;
-
- /*
- * We've found an encoded word, so we can drop
- * the '=' that was pending
- */
- equals_pending = 0;
-
- /*
- * If we are between two encoded words separated only by
- * linear whitespace, then we ignore the whitespace.
- * We will roll back the buffer the number of whitespace
- * characters we've seen since last encoded word.
- */
- if (between_encodings) {
- q -= whitespace;
- dstlen += whitespace;
- }
+ }
+
+ *pp = '?';
+ startofmime = pp + 1;
+
+ /* Check for valid encoding type */
+ if (*startofmime != 'B' && *startofmime != 'b' &&
+ *startofmime != 'Q' && *startofmime != 'q')
+ continue;
+
+ /* Is encoding quoted printable or base64? */
+ quoted_printable = (*startofmime == 'Q' || *startofmime == 'q');
+ startofmime++;
+
+ /* Check for next '?' character */
+ if (*startofmime != '?')
+ continue;
+ startofmime++;
+
+ /*
+ ** Scan ahead for the ending ?=
+ **
+ ** While doing this, we will also check if encoded
+ ** word has any embedded linear whitespace.
+ */
+ endofmime = NULL;
+ for (pp = startofmime; *pp && *(pp+1); pp++) {
+ if (is_lws(*pp)) {
+ break;
+ } else if (*pp == '?' && pp[1] == '=') {
+ endofmime = pp;
+ break;
+ }
+ }
+ if (is_lws(*pp) || endofmime == NULL)
+ continue;
+
+ /*
+ ** We've found an encoded word, so we can drop
+ ** the '=' that was pending
+ */
+ equals_pending = 0;
+
+ /*
+ ** If we are between two encoded words separated
+ ** only by linear whitespace, then we ignore
+ ** the whitespace. We will roll back the buffer
+ ** the number of whitespace characters we've seen
+ ** since last encoded word.
+ */
+ if (between_encodings) {
+ q -= whitespace;
+ dstlen += whitespace;
+ }
#ifdef HAVE_ICONV
- /*
- * empty encoded text. This ensures that we don't
- * malloc 0 bytes but skip on to the end
- */
- if (endofmime == startofmime && use_iconv) {
- use_iconv = 0;
- iconv_close(cd);
- }
-
- if (use_iconv) {
- saveq = q;
- savedstlen = dstlen;
- q = convbuf = (char *) mh_xmalloc(endofmime - startofmime);
- }
-/* ADDCHR2 is for adding characters when q is or might be convbuf:
- * in this case on buffer-full we want to run iconv before returning.
- * I apologise for the dreadful name.
- */
-#define ADDCHR2(C) do { *q++ = (C); dstlen--; if (!dstlen) goto iconvbuffull; } while (0)
+ /*
+ ** empty encoded text. This ensures that we don't
+ ** malloc 0 bytes but skip on to the end
+ */
+ if (endofmime == startofmime && use_iconv) {
+ use_iconv = 0;
+ iconv_close(cd);
+ }
+
+ if (use_iconv) {
+ saveq = q;
+ savedstlen = dstlen;
+ q = convbuf = (char *) mh_xcalloc(endofmime - startofmime, sizeof(char));
+ }
+/*
+** ADDCHR2 is for adding characters when q is or might be convbuf:
+** in this case on buffer-full we want to run iconv before returning.
+** I apologise for the dreadful name.
+*/
+# define ADDCHR2(C) do { *q++ = (C); dstlen--; if (!dstlen) goto iconvbuffull; } while (0)
#else
-#define ADDCHR2(C) ADDCHR(C)
+# define ADDCHR2(C) ADDCHR(C)
#endif
- /* Now decode the text */
- if (quoted_printable) {
- for (pp = startofmime; pp < endofmime; pp++) {
- if (*pp == '=') {
- c = unqp (pp[1], pp[2]);
- if (c == -1)
- continue;
- if (c != 0)
- *q++ = c;
- pp += 2;
- } else if (*pp == '_') {
- ADDCHR2(' ');
- } else {
- ADDCHR2(*pp);
- }
- }
- } else {
- /* base64 */
- int c1, c2, c3, c4;
-
- pp = startofmime;
- while (pp < endofmime) {
- /* 6 + 2 bits */
- while ((pp < endofmime) &&
- ((c1 = char64(*pp)) == -1)) {
- pp++;
- }
- if (pp < endofmime) {
- pp++;
- }
- while ((pp < endofmime) &&
- ((c2 = char64(*pp)) == -1)) {
- pp++;
- }
- if (pp < endofmime && c1 != -1 && c2 != -1) {
- ADDCHR2((c1 << 2) | (c2 >> 4));
- pp++;
- }
- /* 4 + 4 bits */
- while ((pp < endofmime) &&
- ((c3 = char64(*pp)) == -1)) {
- pp++;
- }
- if (pp < endofmime && c2 != -1 && c3 != -1) {
- ADDCHR2(((c2 & 0xF) << 4) | (c3 >> 2));
- pp++;
- }
- /* 2 + 6 bits */
- while ((pp < endofmime) &&
- ((c4 = char64(*pp)) == -1)) {
- pp++;
- }
- if (pp < endofmime && c3 != -1 && c4 != -1) {
- ADDCHR2(((c3 & 0x3) << 6) | (c4));
- pp++;
- }
- }
- }
+ /* Now decode the text */
+ if (quoted_printable) {
+ for (pp = startofmime; pp < endofmime; pp++) {
+ if (*pp == '=') {
+ c = unqp(pp[1], pp[2]);
+ if (c == -1)
+ continue;
+ if (c != 0)
+ *q++ = c;
+ pp += 2;
+ } else if (*pp == '_') {
+ ADDCHR2(' ');
+ } else {
+ ADDCHR2(*pp);
+ }
+ }
+ } else {
+ /* base64 */
+ int c1, c2, c3, c4;
+ c1 = c2 = c3 = c4 = -1;
+
+ pp = startofmime;
+ while (pp < endofmime) {
+ /* 6 + 2 bits */
+ while ((pp < endofmime) &&
+ ((c1 = char64(*pp))
+ == -1)) {
+ pp++;
+ }
+ if (pp < endofmime) {
+ pp++;
+ }
+ while ((pp < endofmime) &&
+ ((c2 = char64(*pp))
+ == -1)) {
+ pp++;
+ }
+ if (pp < endofmime && c1 != -1 && c2 != -1) {
+ ADDCHR2((c1 << 2) | (c2 >> 4));
+ pp++;
+ }
+ /* 4 + 4 bits */
+ while ((pp < endofmime) &&
+ ((c3 = char64(*pp))
+ == -1)) {
+ pp++;
+ }
+ if (pp < endofmime && c2 != -1 && c3 != -1) {
+ ADDCHR2(((c2 & 0xF) << 4) | (c3 >> 2));
+ pp++;
+ }
+ /* 2 + 6 bits */
+ while ((pp < endofmime) &&
+ ((c4 = char64(*pp))
+ == -1)) {
+ pp++;
+ }
+ if (pp < endofmime && c3 != -1 && c4 != -1) {
+ ADDCHR2(((c3 & 0x3) << 6) | (c4));
+ pp++;
+ }
+ }
+ }
#ifdef HAVE_ICONV
- iconvbuffull:
- /* NB that the string at convbuf is not necessarily NUL terminated here:
- * q points to the first byte after the valid part.
- */
- /* Convert to native character set */
- if (use_iconv) {
- size_t inbytes = q - convbuf;
- ICONV_CONST char *start = convbuf;
-
- while (inbytes) {
- if (iconv(cd, &start, &inbytes, &saveq, &savedstlen) ==
- (size_t)-1) {
- if (errno != EILSEQ) break;
- /* character couldn't be converted. we output a `?'
- * and try to carry on which won't work if
- * either encoding was stateful */
- iconv (cd, 0, 0, &saveq, &savedstlen);
- if (!savedstlen)
- break;
- *saveq++ = '?';
- savedstlen--;
- if (!savedstlen)
- break;
- /* skip to next input character */
- if (fromutf8) {
- for (start++;(start < q) && ((*start & 192) == 128);start++)
- inbytes--;
- } else
- start++, inbytes--;
- if (start >= q)
- break;
- }
- }
- q = saveq;
- /* Stop now if (1) we hit the end of the buffer trying to do
- * MIME decoding and have just iconv-converted a partial string
- * or (2) our iconv-conversion hit the end of the buffer.
- */
- if (!dstlen || !savedstlen)
- goto buffull;
- dstlen = savedstlen;
- free(convbuf);
- }
+ iconvbuffull:
+ /*
+ ** NB that the string at convbuf is not necessarily
+ ** NUL terminated here:
+ ** q points to the first byte after the valid part.
+ */
+ /* Convert to native character set */
+ if (use_iconv) {
+ size_t inbytes = q - convbuf;
+ ICONV_CONST char *start = convbuf;
+
+ while (inbytes) {
+ if (iconv(cd, &start, &inbytes, &saveq, &savedstlen) ==
+ (size_t)-1) {
+ if (errno != EILSEQ)
+ break;
+ /*
+ ** character couldn't be
+ ** converted. we output a
+ ** `?' and try to carry on
+ ** which won't work if either
+ ** encoding was stateful
+ */
+ iconv(cd, 0, 0, &saveq, &savedstlen);
+ if (!savedstlen)
+ break;
+ *saveq++ = '?';
+ savedstlen--;
+ if (!savedstlen)
+ break;
+ /* skip to next input character */
+ if (fromutf8) {
+ for (start++;(start < q) && ((*start & 192) == 128);start++)
+ inbytes--;
+ } else
+ start++, inbytes--;
+ if (start >= q)
+ break;
+ }
+ }
+ q = saveq;
+ /*
+ ** Stop now if (1) we hit the end of the
+ ** buffer trying to do MIME decoding and
+ ** have just iconv-converted a partial
+ ** string or (2) our iconv-conversion hit
+ ** the end of the buffer.
+ */
+ if (!dstlen || !savedstlen)
+ goto buffull;
+ dstlen = savedstlen;
+ free(convbuf);
+ }
#endif
-
- /*
- * Now that we are done decoding this particular
- * encoded word, advance string to trailing '='.
- */
- p = endofmime + 1;
-
- encoding_found = 1; /* we found (at least 1) encoded word */
- between_encodings = 1; /* we have just decoded something */
- whitespace = 0; /* re-initialize amount of whitespace */
+
+ /*
+ ** Now that we are done decoding this particular
+ ** encoded word, advance string to trailing '='.
+ */
+ p = endofmime + 1;
+
+ encoding_found = 1; /* we found (at least 1) encoded word */
+ between_encodings = 1; /* we have just decoded something */
+ whitespace = 0; /* re-initialize amount of whitespace */
+ }
}
- }
#ifdef HAVE_ICONV
- if (use_iconv) iconv_close(cd);
+ if (use_iconv) iconv_close(cd);
#endif
- /* If an equals was pending at end of string, add it now. */
- if (equals_pending)
- ADDCHR('=');
- *q = '\0';
+ /* If an equals was pending at end of string, add it now. */
+ if (equals_pending)
+ ADDCHR('=');
+ *q = '\0';
- return encoding_found;
+ return encoding_found;
buffull:
- /* q is currently just off the end of the buffer, so rewind to NUL terminate */
- q--;
- *q = '\0';
- return encoding_found;
+ /*
+ ** q is currently just off the end of the buffer,
+ ** so rewind to NUL terminate
+ */
+ q--;
+ *q = '\0';
+ return encoding_found;
}
projects / mmh / blobdiff