mirror of
https://github.com/moparisthebest/imapfilter
synced 2024-12-21 23:28:49 -05:00
Use new international mailbox names implementation
A new custom implementation of international mailbox names has replaced the previous iconv-based solution.
This commit is contained in:
Lefteris Chatzimparmpas
parent
362a123cd4
commit
066ca99e36
391
src/namespace.c
391
src/namespace.c
@ -1,6 +1,5 @@
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#include <stdio.h>
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#include <string.h>
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#include <iconv.h>
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#include <errno.h>
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#include "imapfilter.h"
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@ -11,6 +10,10 @@ buffer nbuf; /* Namespace buffer. */
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buffer cbuf; /* Conversion buffer. */
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static const char base64[] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,";
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const char *apply_conversion(const char *mbox);
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const char *reverse_conversion(const char *mbox);
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@ -95,113 +98,129 @@ reverse_namespace(const char *mbox, char *prefix, char delim)
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const char *
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apply_conversion(const char *mbox)
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{
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iconv_t cd;
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char *inbuf, *outbuf;
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size_t inlen, outlen;
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char *c, *shift;
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unsigned char *r, *w;
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unsigned char *c, *out;
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unsigned char ucp[4], ucplast, ucptemp;
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int padding, shift;
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buffer_check(&nbuf, strlen(mbox));
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buffer_reset(&nbuf);
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xstrncpy(nbuf.data, mbox, nbuf.size);
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nbuf.len = strlen(nbuf.data);
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buffer_check(&cbuf, nbuf.len * 5);
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buffer_check(&cbuf, nbuf.len * 4);
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buffer_reset(&cbuf);
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r = (unsigned char *)nbuf.data;
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w = (unsigned char *)cbuf.data;
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inbuf = outbuf = NULL;
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inlen = outlen = 0;
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while (*r != '\0') {
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/* Skip non-printable ASCII characters. */
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if (*r < 0x20 || *r == 0x7F) {
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r++;
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c = (unsigned char *)nbuf.data;
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out = (unsigned char *)cbuf.data;
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memset((void *)ucp, 0, sizeof(ucp));
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ucplast = ucptemp = 0;
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padding = shift = 0;
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while (*c != '\0' || shift > 0) {
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if (shift > 0 && *c <= 0x7F) {
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/* Last character so do Base64 padding. */
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if (padding == 2) {
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*out++ = base64[ucplast << 2 & 0x3C];
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} else if (padding == 4) {
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*out++ = base64[ucplast << 4 & 0x30];
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}
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*out++ = '-';
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padding = 0;
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shift = 0;
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continue;
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}
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/* Escape shift character for modified UTF-7. */
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if (*r == '&') {
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*w++ = '&';
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*w++ = '-';
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r++;
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if (*c == '&') {
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*out++ = '&';
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*out++ = '-';
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c++;
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continue;
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/* Copy all ASCII printable characters. */
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} else if ((*c >= 0x20 && *c <= 0x7e)) {
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*out++ = *c;
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c++;
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continue;
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}
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/* Copy ASCII printable characters. */
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if (*r >= 0x20 && *r <= 0x7E) {
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*w++ = *r++;
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continue;
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}
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/* UTF-8 sequence will follow. */
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if (inbuf == NULL) {
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inbuf = (char *)r;
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inlen = 0;
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}
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if ((*r & 0xE0) == 0xC0) { /* Two byte UTF-8. */
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inlen += 2;
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r += 2;
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} else if ((*r & 0xF0) == 0xE0) { /* Three byte UTF-8. */
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inlen += 3;
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r += 3;
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} else if ((*r & 0xF8) == 0xF0) { /* Four byte UTF-8. */
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inlen += 4;
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r += 4;
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}
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/* UTF-8 sequence has ended, convert it to UTF-7. */
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if (inbuf != NULL && (*r <= 0x7F || *r == '\0')) {
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outbuf = (char *)w;
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outlen = cbuf.size - (outbuf - cbuf.data);
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cd = iconv_open("UTF-7", "");
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if (cd == (iconv_t)-1) {
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error("converting mailbox name; %s\n",
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strerror(errno));
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return mbox;
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}
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while (inlen > 0) {
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if (iconv(cd, &inbuf, &inlen, &outbuf, &outlen)
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== -1) {
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if (errno == E2BIG) {
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buffer_check(&cbuf, cbuf.size *
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2);
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break;
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} else {
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error("converting mailbox name;"
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"%s\n", strerror(errno));
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return mbox;
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}
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} else {
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iconv(cd, NULL, NULL, &outbuf, &outlen);
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}
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}
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iconv_close(cd);
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/* Non-ASCII UTF-8 characters follow. */
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if (shift == 0)
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*out++ = '&';
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/* Convert UTF-8 characters to Unicode code point. */
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if ((*c & 0xE0) == 0xC0) {
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shift = 2;
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ucp[0] = 0x07 & *c >> 2;
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ucp[1] = (*c << 6 & 0xC0) | (*(c + 1) & 0x3F);
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c += 2;
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} else if ((*c & 0xF0) == 0xE0) {
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shift = 3;
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ucp[0] = (*c << 4 & 0xF0) | (*(c + 1) >> 2 & 0x0F);
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ucp[1] = (*(c + 1) << 6 & 0xC0) | (*(c + 2) & 0x3F);
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c += 3;
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} else if ((*c & 0xF8) == 0xF0) {
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shift = 4;
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ucptemp = ((*c << 2 & 0x1C) | (*(c + 1) >> 4 & 0x03)) -
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0x01;
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ucp[0] = (ucptemp >> 2 & 0x03) | 0xD8;
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ucp[1] = (ucptemp << 6 & 0xC0) |
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(*(c + 1) << 2 & 0x3C) | (*(c + 2) >> 4 & 0x03);
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ucp[2] = (*(c + 2) >> 2 & 0x03) | 0xDC;
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ucp[3] = (*(c + 2) << 6 & 0xC0) | (*(c + 3) & 0x3F);
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c += 4;
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}
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w = (unsigned char *)outbuf;
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inbuf = outbuf = NULL;
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inlen = outlen = 0;
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/* Convert Unicode characters to UTF-7. */
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if (padding == 0) {
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*out++ = base64[ucp[0] >> 2 & 0x3F];
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*out++ = base64[(ucp[0] << 4 & 0x30) |
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(ucp[1] >> 4 & 0x0F)];
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if (shift == 4) {
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ucplast = ucp[3];
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*out++ = base64[(ucp[1] << 2 & 0x3C) |
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(ucp[2] >> 6 & 0x03)];
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*out++ = base64[ucp[2] & 0x3F];
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*out++ = base64[ucp[3] >> 2 & 0x3F];
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padding = 4;
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} else {
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ucplast = ucp[1];
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padding = 2;
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}
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} else if (padding == 2) {
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*out++ = base64[(ucplast << 2 & 0x3C) |
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(ucp[0] >> 6 & 0x03)];
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*out++ = base64[ucp[0] & 0x3F];
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*out++ = base64[ucp[1] >> 2 & 0x3F];
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if (shift == 4) {
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*out++ = base64[(ucp[1] << 4 & 0x30) |
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(ucp[2] >> 4 & 0x0F)];
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*out++ = base64[(ucp[2] << 2 & 0x3C) |
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(ucp[3] >> 6 & 0x03)];
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*out++ = base64[ucp[3] & 0x3F];
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padding = 0;
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} else {
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ucplast = ucp[1];
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padding = 4;
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}
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} else if (padding == 4) {
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*out++ = base64[(ucplast << 4 & 0x30) |
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(ucp[0] >> 4 & 0x0F)];
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*out++ = base64[(ucp[0] << 2 & 0x3C) |
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(ucp[1] >> 6 & 0x03)];
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if (shift == 4) {
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ucplast = ucp[3];
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*out++ = base64[ucp[1] & 0x3F];
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*out++ = base64[ucp[2] >> 2 & 0x3F];
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*out++ = base64[(ucp[2] << 4 & 0x30) |
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(ucp[3] >> 4 & 0x0F)];
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padding = 2;
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} else {
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*out++ = base64[ucp[1] & 0x3F];
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padding = 0;
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}
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}
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}
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if (*w != '\0')
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*w = '\0';
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/* Convert UTF-7 sequences to IMAP modified UTF-7. */
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for (c = cbuf.data, shift = NULL; *c != '\0'; c++)
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switch (*c) {
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case '+':
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*c = '&';
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shift = c;
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break;
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case '-':
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shift = NULL;
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break;
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case '/':
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if (shift != NULL)
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*c = ',';
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break;
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}
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if (shift != NULL) {
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*w++ = '-';
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*w = '\0';
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}
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*out = '\0';
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debug("conversion: '%s' -> '%s'\n", nbuf.data, cbuf.data);
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@ -215,82 +234,144 @@ apply_conversion(const char *mbox)
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const char *
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reverse_conversion(const char *mbox)
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{
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iconv_t cd;
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char *inbuf, *outbuf;
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size_t inlen, outlen;
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char *c, *shift;
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unsigned char *c, *out;
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unsigned char ucp[4], ucptemp;
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unsigned char b64[6], b64last;
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int padding;
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buffer_check(&cbuf, strlen(mbox));
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buffer_reset(&cbuf);
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xstrncpy(cbuf.data, mbox, cbuf.size);
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cbuf.len = strlen(cbuf.data);
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buffer_check(&nbuf, cbuf.len);
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buffer_reset(&nbuf);
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/* Convert IMAP modified UTF-7 sequences to UTF-7. */
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for (c = cbuf.data, shift = NULL; *c != '\0'; c++)
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switch (*c) {
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case '&':
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*c = '+';
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shift = c;
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break;
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case '-':
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shift = NULL;
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break;
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case ',':
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if (shift != NULL)
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*c = '/';
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break;
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}
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c = (unsigned char *)cbuf.data;
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out = (unsigned char *)nbuf.data;
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do {
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inbuf = cbuf.data;
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inlen = strlen(cbuf.data);
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memset((void *)ucp, 0, sizeof(ucp));
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memset((void *)b64, 0, sizeof(b64));
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ucptemp = b64last = 0;
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padding = 0;
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buffer_check(&nbuf, inlen);
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buffer_reset(&nbuf);
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outbuf = nbuf.data;
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outlen = nbuf.size;
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cd = iconv_open("", "UTF-7");
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if (cd == (iconv_t)-1) {
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error("converting mailbox name; %s\n", strerror(errno));
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return mbox;
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}
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while (inlen > 0) {
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if (iconv(cd, &inbuf, &inlen, &outbuf, &outlen) == -1) {
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if (errno == E2BIG) {
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buffer_check(&nbuf, nbuf.size * 2);
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break;
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} else {
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error("converting mailbox name; %s\n",
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strerror(errno));
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return mbox;
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}
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while (*c != '\0') {
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/* Copy all ASCII printable characters. */
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if (*c >= 0x20 && *c <= 0x7e) {
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if (*c != '&') {
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*out++ = *c++;
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continue;
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} else {
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iconv(cd, NULL, NULL, &outbuf, &outlen);
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c++;
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}
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}
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iconv_close(cd);
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} while (inlen > 0);
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*outbuf = '\0';
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for (c = nbuf.data; (c = strchr(c,'+')) != NULL; *c = '&');
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/* Convert UTF-7 sequences to IMAP modified UTF-7. */
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for (c = cbuf.data, shift = NULL; *c != '\0'; c++)
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switch (*c) {
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case '+':
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*c = '&';
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shift = c;
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break;
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case '-':
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shift = NULL;
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break;
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case '/':
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if (shift != NULL)
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*c = ',';
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break;
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/* Write shift character for modified UTF-7. */
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if (*c == '-') {
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*out++ = '&';
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c++;
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continue;
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}
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/* UTF-7 characters follow. */
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padding = 0;
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do {
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/* Read Base64 characters. */
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b64[0] = strchr(base64, *c) - base64;
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b64[1] = strchr(base64, *(c + 1)) - base64;
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if (padding == 0 || padding == 2) {
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b64[2] = strchr(base64, *(c + 2)) - base64;
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c += 3;
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} else {
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c += 2;
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}
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/* Convert from Base64 to Unicode code point. */
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if (padding == 0) {
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ucp[0] = (b64[0] << 2 & 0xFC) |
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(b64[1] >> 4 & 0x03);
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ucp[1] = (b64[1] << 4 & 0xF0) |
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(b64[2] >> 2 & 0x0F);
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b64last = b64[2];
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padding = 2;
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} else if (padding == 2) {
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ucp[0] = (b64last << 6 & 0xC0) |
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(b64[0] & 0x3F);
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ucp[1] = (b64[1] << 2 & 0xFC) |
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(b64[2] >> 4 & 0x03);
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b64last = b64[2];
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padding = 4;
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} else if (padding == 4) {
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ucp[0] = (b64last << 4 & 0xF0) |
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(b64[0] >> 2 & 0x0F);
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ucp[1] = (b64[0] << 6 & 0xC0) |
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(b64[1] & 0x3F);
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padding = 0;
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}
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/* Convert from Unicode to UTF-8. */
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if (ucp[0] >= 0x00 && ucp[0] <= 0x07) {
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*out++ = 0xC0 | (ucp[0] << 2 & 0x1C) |
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(ucp[1] >> 6 & 0x03);
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*out++ = 0x80 | (ucp[1] & 0x3F);
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} else if ((ucp[0] >= 0x08 && ucp[0] <= 0xD7) ||
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(ucp[0] >= 0xE0 && ucp[0] <= 0xFF)) {
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*out++ = 0xE0 | (ucp[0] >> 4 & 0x0F);
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*out++ = 0x80 | (ucp[0] << 2 & 0x1C) |
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(ucp[1] >> 6 & 0x03);
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*out++ = 0x80 | (ucp[1] & 0x3F);
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} else if (ucp[0] >= 0xD8 && ucp[0] <= 0xDF) {
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b64[3] = strchr(base64, *c) - base64;
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b64[4] = strchr(base64, *(c + 1)) - base64;
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if (padding == 0 || padding == 2) {
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b64[5] = strchr(base64, *(c + 2)) -
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base64;
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c += 3;
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} else {
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c += 2;
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}
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if (padding == 0) {
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ucp[2] = (b64[3] << 2 & 0xFC) |
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(b64[4] >> 4 & 0x03);
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ucp[3] = (b64[4] << 4 & 0xF0) |
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(b64[5] >> 2 & 0x0F);
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b64last = b64[5];
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padding = 2;
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} else if (padding == 2) {
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ucp[2] = (b64last << 6 & 0xC0) |
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(b64[3] & 0x3F);
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ucp[3] = (b64[4] << 2 & 0xFC) |
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(b64[5] >> 4 & 0x03);
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b64last = b64[5];
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padding = 4;
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} else if (padding == 4) {
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ucp[2] = (b64last << 4 & 0xF0) |
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(b64[3] >> 2 & 0x0F);
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ucp[3] = (b64[3] << 6 & 0xC0) |
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(b64[4] & 0x3F);
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padding = 0;
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}
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ucp[0] &= 0xFF - 0xDF;
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ucptemp = ((ucp[0] << 2 & 0x0C) |
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(ucp[1] >> 6 & 0x03)) + 0x1;
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ucp[2] &= 0xFF - 0xDC;
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*out++ = 0xF0 | (ucptemp >> 2 & 0x03);
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*out++ = 0x80 | (ucptemp << 4 & 0x30) |
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(ucp[1] >> 2 & 0x0F);
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*out++ = 0x80 | (ucp[1] << 4 & 0x30) |
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(ucp[2] << 2 & 0x0C) |
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(ucp[3] >> 6 & 0x03);
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*out++ = 0x80 | (ucp[3] & 0x3F);
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}
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if (*c == '-') {
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c++;
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break;
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}
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} while (*c != '-');
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}
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*out = '\0';
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debug("conversion: '%s' <- '%s'\n", nbuf.data, cbuf.data);
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return nbuf.data;
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