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-rw-r--r--camel/gmime-rfc2047.c491
1 files changed, 0 insertions, 491 deletions
diff --git a/camel/gmime-rfc2047.c b/camel/gmime-rfc2047.c
deleted file mode 100644
index 339a54d521..0000000000
--- a/camel/gmime-rfc2047.c
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@@ -1,491 +0,0 @@
-/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
-/* gmime-rfc2047.c: implemention of RFC2047 */
-
-/*
- * Author :
- * Bertrand Guiheneuf <bertrand@helixcode.com>
- *
- * Copyright 1999, 2000 Helix Code, Inc. (http://www.helixcode.com)
- *
- * 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 (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.
- *
- * 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
- *
- */
-
-/*
- * Authors: Robert Brady <rwb197@ecs.soton.ac.uk>
- */
-
-#include <stdio.h>
-#include <ctype.h>
-#include <unicode.h>
-#include <string.h>
-
-#include "gmime-rfc2047.h"
-
-#define NOT_RANKED -1
-
-/* This should be changed ASAP to use the base64 code Miguel comitted */
-
-const char *base64_alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
-
-static unsigned char base64_rank[256];
-static int base64_rank_table_built;
-static void build_base64_rank_table (void);
-
-static int
-hexval (gchar c) {
- if (isdigit (c)) return c-'0';
- c = tolower (c);
- return c - 'a' + 10;
-}
-
-static gchar *
-decode_quoted (const gchar *text, const gchar *end)
-{
- gchar *to = malloc(end - text + 1), *to_2 = to;
-
- if (!to) return NULL;
- while (*text && text < end) {
- if (*text == '=') {
- gchar a = hexval (text[1]);
- gchar b = hexval (text[2]);
- int c = (a << 4) + b;
- *to = c;
- to++;
- text+=3;
- } else if (*text == '_') {
- *to = ' ';
- to++;
- text++;
- } else {
- *to = *text;
- to++;
- text++;
- }
- }
- return to_2;
-}
-
-static gchar *
-decode_base64 (const gchar *data, const gchar *end)
-{
- unsigned short pattern = 0;
- int bits = 0;
- int delimiter = '=';
- gchar x;
- gchar *buffer = g_malloc((end - data) * 3);
- gchar *t = buffer;
- int Q = 0;
-
- if (!buffer) return NULL;
-
- while (*data != delimiter) {
- x = base64_rank[(unsigned char)(*data++)];
- if (x == NOT_RANKED)
- continue;
- pattern <<= 6;
- pattern |= x;
- bits += 6;
- if (bits >= 8) {
- x = (pattern >> (bits - 8)) & 0xff;
- *t++ = x;
- Q++;
- bits -= 8;
- }
- }
- *t = 0;
- return buffer;
-}
-
-static void
-build_base64_rank_table (void)
-{
- int i;
-
- if (!base64_rank_table_built) {
- for (i = 0; i < 256; i++)
- base64_rank[i] = NOT_RANKED;
- for (i = 0; i < 64; i++)
- base64_rank[(int) base64_alphabet[i]] = i;
- base64_rank_table_built = 1;
- }
-}
-
-
-static gchar *
-rfc2047_decode_word (const gchar *data, const gchar *into_what)
-{
- const char *charset = strstr (data, "=?"), *encoding, *text, *end;
-
- char *buffer, *b, *cooked_data;
-
- buffer = g_malloc (strlen(data) * 2);
- b = buffer;
-
- if (!charset) return strdup (data);
- charset+=2;
-
- encoding = strchr (charset, '?');
- if (!encoding) return strdup (data);
- encoding++;
-
- text = strchr(encoding, '?');
- if (!text) return strdup (data);
- text++;
-
- end = strstr(text, "?=");
- if (!end) return strdup (data);
-
- b[0] = 0;
-
- if (toupper(*encoding)=='Q')
- cooked_data = decode_quoted (text, end);
- else if (toupper (*encoding)=='B')
- cooked_data = decode_base64 (text, end);
- else
- return g_strdup(data);
-
- {
- char *c = strchr (charset, '?');
- char *q = g_malloc (c - charset + 1);
- char *cook_2 = cooked_data;
- int cook_len = strlen (cook_2);
- int b_len = 4096;
- unicode_iconv_t i;
- strncpy (q, charset, c - charset);
- q[c - charset] = 0;
- i = unicode_iconv_open (into_what, q);
- if (!i) {
- g_free (q);
- return g_strdup (buffer);
- }
- if (unicode_iconv (i, &cook_2, &cook_len, &b, &b_len)==-1)
- /* FIXME : use approximation code if we can't convert it properly. */
- ;
- unicode_iconv_close (i);
- *b = 0;
- }
-
- return g_strdup (buffer);
-}
-
-static const gchar *
-find_end_of_encoded_word (const gchar *data)
-{
- /* We can't just search for ?=,
- because of the case :
- "=?charset?q?=ff?=" :( */
- if (!data) return NULL;
- data = strstr (data, "=?");
- if (!data) return NULL;
- data = strchr(data+2, '?');
- if (!data) return NULL;
- data = strchr (data+1, '?');
- if (!data) return NULL;
- data = strstr (data+1, "?=");
- if (!data) return NULL;
- return data + 2;
-}
-
-gchar *
-gmime_rfc2047_decode (const gchar *data, const gchar *into_what)
-{
- char *buffer = malloc (strlen(data) * 4), *b = buffer;
-
- int was_encoded_word = 0;
-
- build_base64_rank_table ();
-
- while (data && *data) {
- char *word_start = strstr (data, "=?"), *decoded;
- if (!word_start) {
- strcpy (b, data);
- b[strlen (data)] = 0;
- return buffer;
- }
- if (word_start != data) {
-
- if (strspn (data, " \t\n\r") != (word_start - data)) {
- strncpy (b, data, word_start - data);
- b += word_start - data;
- *b = 0;
- }
- }
- decoded = rfc2047_decode_word (word_start, into_what);
- strcpy (b, decoded);
- b += strlen (decoded);
- *b = 0;
- g_free (decoded);
-
- data = find_end_of_encoded_word (data);
- }
-
- *b = 0;
- return buffer;
-}
-
-#define isnt_ascii(a) ((a) <= 0x1f || (a) >= 0x7f)
-
-static int
-rfc2047_clean (const gchar *string, const gchar *max)
-{
- /* if (strstr (string, "?=")) return 1; */
- while (string < max) {
- if (isnt_ascii ((unsigned char)*string))
- return 0;
- string++;
- }
- return 1;
-}
-
-static gchar *
-encode_word (const gchar *string, int length, const gchar *said_charset)
-{
- const gchar *max = string + length;
- if (rfc2047_clean(string, max)) {
- /* don't bother encoding it if it has no odd characters in it */
- return g_strndup (string, length);
- }
- {
- char *temp = malloc (length * 4 + 1), *t = temp;
- t += sprintf (t, "=?%s?q?", said_charset);
- while (string < max) {
- if (*string == ' ')
- *(t++) = '_';
- else if ((*string <= 0x1f) || (*string >= 0x7f) || (*string == '=') || (*string == '?'))
- t += sprintf (t, "=%2x", (unsigned char)*string);
- else
- *(t++) = *string;
-
- string++;
- }
- t += sprintf (t, "?=");
- *t = 0;
- return temp;
- }
-}
-
-static int
-words_in(char *a)
-{
- int words = 1;
- while (*a) {
- if (*(a++)==' ')
- words++;
- }
- return words;
-}
-
-struct word_data {
- const char *word;
- int word_length;
- const char *to_encode_in;
- char *encoded;
- enum {
- wt_None,
- wt_Address,
- } type;
-};
-
-static int string_can_fit_in(const char *a, int length, const char *charset)
-{
- while (length--) {
- if (*a < 0x1f || *a >= 0x7f) return 0;
- a++;
- }
- return 1;
-}
-
-static void
-show_entry(struct word_data *a)
-{
- a->type = wt_None;
-
- if (string_can_fit_in(a->word, a->word_length, "US-ASCII"))
- a->to_encode_in = "US-ASCII";
-
- if (a->word[0]=='<' && a->word[a->word_length-1]=='>') {
- a->type = wt_Address;
- }
-}
-
-static void
-break_into_words(const char *string, struct word_data *a, int words)
-{
- int i;
- for (i=0;i<words;i++) {
-
- char *next_space = strchr(string, ' ');
-
- if (!next_space) {
- a[i].word = string;
- a[i].word_length = strlen(string);
- a[i].to_encode_in = NULL; /* i.e. the default */
-
- show_entry(a+i);
-
- return;
- }
-
- a[i].word = string;
- a[i].word_length = next_space - string;
- a[i].to_encode_in = NULL;
-
- show_entry(a+i);
-
- string = next_space + 1;
-
- }
-}
-
-static void
-join_words(struct word_data *a, int words)
-{
- int i;
- for (i=(words-1);i>0;i--) {
- if (a[i].to_encode_in == a[i-1].to_encode_in) {
- a[i-1].word_length += 1 + a[i].word_length;
- a[i].word = 0;
- a[i].word_length = 0;
- }
-
- }
-}
-
-static void show_words(struct word_data *words, int count)
-{
- int i;
- for (i=0;i<count;i++)
- if (words[i].word)
- show_entry(words+i);
-}
-
-gchar *
-gmime_rfc2047_encode (const gchar *string, const gchar *charset)
-{
- int temp_len = strlen (string)*4 + 1, word_count;
- char *temp = g_malloc (temp_len), *temp_2 = temp;
- int string_length = strlen (string);
- char *encoded = NULL, *p;
- struct word_data *words;
-
- /* first, let us convert to UTF-8 */
- unicode_iconv_t i = unicode_iconv_open ("UTF-8", charset);
- unicode_iconv (i, &string, &string_length, &temp_2, &temp_len);
- unicode_iconv_close (i);
-
- /* null terminate it */
- *temp_2 = 0;
-
- /* now encode it as if it were a single word */
-
- word_count = words_in ( temp );
-
- words = g_malloc(sizeof (struct word_data) * word_count);
- break_into_words(temp, words, word_count);
-
- join_words(words, word_count);
-
- show_words(words, word_count);
-
- {
- size_t len = 0;
- int c = 0;
- for (c = 0;c<word_count;c++) {
- if (words[c].word)
- {
- words[c].encoded = encode_word(words[c].word, words[c].word_length,
- words[c].to_encode_in ? words[c].to_encode_in :
- "UTF-8");
- len += strlen(words[c].encoded) + 1;
- }
- }
-
- {
- encoded = g_malloc(len+1);
- p = encoded;
- for (c = 0; c < word_count;c++) if (words[c].word) {
- strcpy(p, words[c].encoded);
- p += strlen(p);
- strcpy(p, " ");
- p++;
- }
- *p = 0;
- }
- }
-
-
- /*
-
- real algorithm :
-
- we need to
-
- split it into words
-
- identify portions that have NOT to be encoded (i.e. <> and the comment starter/ender )
-
- identify the best character set for each word
-
- merge words which share a character set, allow jumping and merging with words which
- would be ok to encode in non-US-ASCII.
-
- if we have to use 2 character sets, try and collapse them into one.
-
- (e.g. if one word contains letters in latin-1, and another letters in latin-2, use
- latin-2 for the first word as well if possible).
-
- finally :
-
- if utf-8 will still be used, use it for everything.
-
- and then, at last, generate the encoded text, using base64/quoted-printable for
- each word depending upon which is more efficient.
-
- TODO :
- create a priority list of encodings
-
- i.e.
-
- US-ASCII, ISO-8859-1, ISO-8859-2, ISO-8859-3, KOI8,
-
- Should survey for most popular charsets :
- what do people usually use for the following scripts?
-
- * Chinese/Japanese/Korean
- * Greek
- * Cyrillic
-
- (any other scripts commonly used in mail/news?)
-
- This algorithm is probably far from optimal, but should be
- reasonably efficient for simple cases. (and almost free if
- the text is just in US-ASCII : like 99% of the text that will
- pass through it)
-
-
-
- current status :
-
- Algorithm now partially implemented.
-
- */
-
- g_free(words);
- g_free(temp);
-
- return encoded;
-}
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