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codecs.c
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codecs.c
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/***************************************************************************
SimpleMail - Copyright (C) 2000 Hynek Schlawack and Sebastian Bauer
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
***************************************************************************/
/**
* @file codecs.c
*/
#include "codecs.h"
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "addresslist.h"
#include "codesets.h"
#include "lists.h"
#include "parse.h"
#include "support_indep.h"
/* encoding table for the base64 coding */
static const char encoding_table[] =
{
'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z',
'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',
'0','1','2','3','4','5','6','7','8','9','+','/'
};
/*****************************************************************************/
char *decode_base64(unsigned char *src, unsigned int len, unsigned int *ret_len)
{
static const signed char decoding_table[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,-2,-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
};
unsigned char *srcmax=src+len,*dest,*deststart;
unsigned int limit = *ret_len;
unsigned int real_len = 0;
*ret_len=0;
if(!(dest=(unsigned char*)malloc(len*3/4+1))) return NULL;
deststart=dest;
while (src + 3 < srcmax)
{
if(src[0] > 127) {src++; continue;};
if(-1 == decoding_table[src[0]])
{
src++;
continue;
} else {
unsigned char c1,c2,c3,c4;
c1=decoding_table[src[0] & 0x7f];
c2=decoding_table[src[1] & 0x7f];
c3=decoding_table[src[2] & 0x7f];
c4=decoding_table[src[3] & 0x7f];
*dest++ = (c1 << 2) | (c2 >> 4);
if (src[2] == '=') break;
*dest++ = (c2 << 4) | (c3 >> 2);
if (src[3] == '=') break;
*dest++ = (c3 << 6) | c4;
real_len += 3;
if (real_len >= limit) break;
src += 4;
}
}
*dest=0;
*ret_len=dest-deststart;
return (char*)realloc(deststart,*ret_len+1);
}
#define IS_HEX(c) ((((c) >= '0') && ((c) <= '9')) || \
(((c) >= 'A') && ((c) <= 'F')) || \
(((c) >= 'a') && ((c) <= 'f')))
#define FROM_HEX(c) ((c) - (((c) > '9') ? \
(((c) > 'F') ? 'a' - 10 : 'A' - 10 ) : '0'))
/*****************************************************************************/
char *decode_quoted_printable(unsigned char *buf, unsigned int len, unsigned int *ret_len, int header)
{
unsigned char *dest,*deststart;
unsigned int limit = *ret_len;
*ret_len=0;
if(!len) return NULL;
if(!(dest=(unsigned char*)malloc(len+1))) return NULL;
deststart=dest;
if(header)
{
unsigned int real_len = 0;
while(len--)
{
unsigned char c=*buf++;
if('=' == c)
{
unsigned char c2;
c=buf[0];
c2=buf[1];
if (IS_HEX(c) && IS_HEX(c2))
{
c = (FROM_HEX(c) << 4) | FROM_HEX(c2);
if(len) len--;
if(len) len--;
buf += 2;
} else c = '='; /* should never happen */
} else if('_' == c) c=' ';
*dest++ = c;
if (++real_len >= limit) break;
}
*dest = 0;
*ret_len=dest-deststart;
return (char*)realloc(deststart,*ret_len+1);
} else { /* body */
unsigned char *text,*textstart;
if(!(text=(unsigned char*)malloc(len+1))) {free(dest); return NULL;}
memcpy(text,buf,len);
text[len]=0;
textstart=text;
while(text)
{
unsigned char c;
unsigned char *lp = text;
/* Remove trailing white space from end of line */
{
unsigned char *ep;
/* Look for end of line */
if ((ep = (unsigned char*)strchr((char*)lp, '\n')))
{
text = ep + 1;
ep--;
/* If this check is omitted we could write in the last line of this scope
* before the mallocation, if the first line has only a \n character */
if (ep >= lp)
{
if('\r' == *ep) ep--;
}
} else {
ep = lp + strlen((char*)lp) - 1;
text = NULL; /* End of text reached */
}
/* Remove trailing white space */
while ((ep >= lp) && (((c = *ep) == ' ') || (c == '\t'))) ep--;
/* Set string terminator */
*(ep + 1) = '\0';
}
/* Scan line */
do
{
switch (c = *lp++)
{
case '\0': /* Line end reached. Add line end (only while in text) */
if (text) *dest++ = '\n';
break;
case '=': /* Encoded character */
/* End of line reached? (-> soft line break!) */
if ((c = *lp))
{
unsigned char d = *(lp + 1);
/* Sanity check */
if (IS_HEX(c) && IS_HEX(d))
{
/* Decode two hex digit to 8-Bit characters */
*dest++ = (FROM_HEX(c) << 4) | FROM_HEX(d);
/* Move line pointer */
lp += 2;
} else {
/* The '=' was not followed by two hex digits. This is actually */
/* a violation of the standard. We put the '=' into the decoded */
/* text and continue decoding after the '�' character. */
*dest++ = '=';
}
}
break;
default: /* Normal character */
*dest++ = c;
break;
}
if ((unsigned int)(dest-deststart)>= limit)
{
text = NULL;
break;
}
} while (c);
}
/* Add string terminator */
*dest=0;
free(textstart);
*ret_len=dest-deststart;
return (char*)realloc(deststart,*ret_len+1);
}
}
/*
unsigned char *strencoded(unsigned char *str)
{
unsigned char c;
while ((c=*str))
{
if (c > 127 || c == '=' || c == '?')
return
}
}
*/
static int get_noencode_str(unsigned char *buf)
{
int space = 0;
unsigned char *buf_start = buf;
unsigned char *word_start = buf;
unsigned char c;
while ((c=*buf))
{
if (isspace(c)) space = 1;
else
{
if (space)
{
word_start = buf; /* a new word starts */
space = 0;
}
if (c < 32 || c > 127 || (c == '=' && *(buf+1) == '?'))
{
return word_start - buf_start;
}
}
buf++;
}
return buf - buf_start;
}
static int get_encode_str(unsigned char *buf)
{
int space = 0;
unsigned char *buf_start = buf;
unsigned char *word_end = NULL;
unsigned char c;
int toencode = 0;
while ((c=*buf))
{
if (isspace(c))
{
if (!space)
{
if (!toencode) break;
word_end = buf;
toencode = 0;
}
space = 1;
}
else
{
if (space)
{
space = 0;
}
if (c<32 || c >= 127 || (c == '=' && *(buf+1)=='?'))
{
toencode = 1;
}
}
buf++;
}
if (!toencode)
{
if (!word_end) return 0;
return word_end - buf_start;
}
return buf - buf_start;
}
/**
* Encodes a given header string (changed after 1.7)
* If structured is on the resulting string also may contains quotation
* marks
*
* @param toencode
* @param line_len_ptr
* @param structured
* @return
*/
static char *encode_header_str(const char *toencode, int *line_len_ptr, int structured)
{
int line_len = *line_len_ptr;
int encoded_len = 0;
int toencode_len = mystrlen(toencode);
char *encoded = NULL;
int max_line_len = 72; /* RFC 2047 says it can be 76 */
FILE *fh;
if (!toencode) return NULL;
if ((fh = tmpfile()))
{
while (toencode_len)
{
int l;
if ((l = get_noencode_str((unsigned char*)toencode)))
{
int quotes = structured && needs_quotation_len(toencode,l);
int space_add;
if ((line_len + l + (quotes?2:0)) > max_line_len && line_len > 1)
{
fputs("\n ",fh);
encoded_len += 2;
line_len = 1;
}
if (toencode[l-1] == ' ' && quotes)
{
/* the last space should split the quoted string from the encoded word */
l--;
space_add = 1;
} else space_add = 0;
if (quotes) fputc('"',fh);
fwrite(toencode,1,l,fh);
toencode += l;
toencode_len -= l;
if (quotes) fputc('"',fh);
if (space_add)
{
fputc(' ',fh);
l++;
toencode++;
toencode_len--;
}
line_len += l + (quotes?2:0);
encoded_len += l + (quotes?2:0);
/* while (l)
{
if (line_len >= max_line_len)
{
fputs("\n ",fh);
encoded_len += 2;
line_len = 1;
}
fputc(*toencode,fh);
l--;
toencode_len--;
toencode++;
line_len++;
encoded_len++;
}*/
}
if ((l = get_encode_str((unsigned char*)toencode)))
{
char buf[32];
int buf_len;
int line_start = 1;
int have_written = 0;
while (l)
{
unsigned char c = *toencode;
if (line_start)
{
strcpy(buf,"=?iso-8859-1?q?");
buf_len = sizeof("=?iso-8859-1?q?")-1;
line_start = 0;
} else buf_len = 0;
if (c > 127 || c == '_' || c == '?' || c == '=')
{
sprintf(&buf[buf_len],"=%02X",c);
buf_len += 3;
} else
{
if (c==' ') c = '_';
buf[buf_len++] = c;
}
if (buf_len + line_len > 70)
{
line_start = 1;
line_len = 1;
if (have_written)
{
fputs("?=\n ",fh);
encoded_len += 4;
} else
{
fputs("\n ",fh);
encoded_len += 2;
}
continue;
}
have_written = 1;
fwrite(buf,1,buf_len,fh);
encoded_len += buf_len;
line_len += buf_len;
l--;
toencode_len--;
toencode++;
}
if (have_written)
{
fputs("?=",fh);
encoded_len += 2;
}
}
}
if (encoded_len)
{
fseek(fh,0,SEEK_SET);
if ((encoded = (char*)malloc(encoded_len+1)))
{
fread(encoded,1,encoded_len,fh);
encoded[encoded_len]=0;
}
}
fclose(fh);
}
*line_len_ptr = line_len;
return encoded;
}
/**
* Encodes a given header string (changed after 1.7)
* If structured is on the resulting string also may contains quotation
* marks.
*
* @param toencode
* @param line_len_ptr
* @param structured
* @return
*/
static char *encode_header_str_utf8(const char *toencode, int *line_len_ptr, int structured)
{
int line_len = *line_len_ptr;
int encoded_len = 0;
int toencode_len = mystrlen(toencode);
char *encoded = NULL;
int max_line_len = 72; /* RFC 2047 says it can be 76 */
FILE *fh;
if (!toencode) return NULL;
if ((fh = tmpfile()))
{
while (toencode_len>0)
{
int l;
if ((l = get_noencode_str((unsigned char*)toencode)))
{
int quotes = structured && needs_quotation_len(toencode,l);
int space_add;
if ((line_len + l + (quotes?2:0)) > max_line_len && line_len > 1)
{
fputs("\n ",fh);
encoded_len += 2;
line_len = 1;
}
if (toencode[l-1] == ' ' && quotes)
{
/* the last space should split the quoted string from the encoded word */
l--;
space_add = 1;
} else space_add = 0;
if (quotes) fputc('"',fh);
fwrite(toencode,1,l,fh);
toencode += l;
toencode_len -= l;
if (quotes) fputc('"',fh);
if (space_add)
{
fputc(' ',fh);
l++;
toencode++;
toencode_len--;
}
line_len += l + (quotes?2:0);
encoded_len += l + (quotes?2:0);
}
if ((l = get_encode_str((unsigned char*)toencode)))
{
char buf[32];
struct codeset *best_codeset;
int buf_len;
int line_start = 1;
int have_written = 0;
/* Find the best encoding for the given text part */
best_codeset = codesets_find_best(toencode,l,NULL);
while (l>0)
{
unsigned int nc;
int toencode_add;
if (line_start)
{
sprintf(buf,"=?%s?q?",best_codeset->name);
buf_len = strlen(buf);
line_start = 0;
} else buf_len = 0;
toencode_add = utf8tochar(toencode, &nc, best_codeset);
if (nc > 127 || nc == '_' || nc == '?' || nc == '=')
{
sprintf(&buf[buf_len],"=%02X",nc);
buf_len += 3;
} else
{
if (nc==' ' || !nc) nc = '_';
buf[buf_len++] = nc;
}
if (buf_len + line_len > 70)
{
line_start = 1;
line_len = 1;
if (have_written)
{
fputs("?=\n ",fh);
encoded_len += 4;
} else
{
fputs("\n ",fh);
encoded_len += 2;
}
continue;
}
have_written = 1;
fwrite(buf,1,buf_len,fh);
encoded_len += buf_len;
line_len += buf_len;
l -= toencode_add;
toencode_len -= toencode_add;
toencode += toencode_add;
}
if (have_written)
{
fputs("?=",fh);
encoded_len += 2;
}
}
}
if (encoded_len)
{
fseek(fh,0,SEEK_SET);
if ((encoded = (char*)malloc(encoded_len+1)))
{
fread(encoded,1,encoded_len,fh);
encoded[encoded_len]=0;
}
}
fclose(fh);
}
*line_len_ptr = line_len;
return encoded;
}
/*****************************************************************************/
char *encode_header_field(const char *field_name, const char *field_contents)
{
char *header = NULL;
int line_len;
FILE *fh;
if ((fh = tmpfile()))
{
char *encoded;
int header_len;
fprintf(fh, "%s: ",field_name);
line_len = strlen(field_name) + 2;
if ((encoded = encode_header_str(field_contents, &line_len,0)))
{
fprintf(fh, "%s", encoded);
free(encoded);
}
fputc('\n',fh);
if ((header_len = ftell(fh)))
{
fseek(fh,0,SEEK_SET);
if ((header = (char*)malloc(header_len+1)))
{
fread(header,1,header_len,fh);
header[header_len]=0;
}
}
fclose(fh);
}
return header;
}
/*****************************************************************************/
char *encode_header_field_utf8(const char *field_name, const char *field_contents)
{
char *header = NULL;
int line_len;
FILE *fh;
if ((fh = tmpfile()))
{
char *encoded;
int header_len;
fprintf(fh, "%s: ",field_name);
line_len = strlen(field_name) + 2;
if ((encoded = encode_header_str_utf8(field_contents, &line_len,0)))
{
fprintf(fh, "%s", encoded);
free(encoded);
}
fputc('\n',fh);
if ((header_len = ftell(fh)))
{
fseek(fh,0,SEEK_SET);
if ((header = (char*)malloc(header_len+1)))
{
fread(header,1,header_len,fh);
header[header_len]=0;
}
}
fclose(fh);
}
return header;
}
/*****************************************************************************/
char *encode_address_field(const char *field_name, struct address_list *address_list)
{
int field_len = strlen(field_name) + 2; /* including the ':' and the space */
int header_len;
int line_len;
char *header = NULL;
FILE *fh;
if ((fh = tmpfile()))
{
struct address *address;
fprintf(fh, "%s: ",field_name);
line_len = field_len;
address = (struct address*)list_first(&address_list->list);
while (address)
{
struct address *next_address = (struct address*)node_next(&address->node);
char *text = encode_header_str(address->realname, &line_len,1);
if (text)
{
fputs(text,fh);
if (address->email)
{
int email_len = strlen(address->email) + 2;
if (line_len + email_len + 1 + (next_address?1:0) > 72) /* <>, space and possible comma */
{
line_len = 1;
fprintf(fh,"\n ");
} else
{
fputc(' ',fh);
line_len++;
}
fprintf(fh,"<%s>%s",address->email,next_address?",":"");
line_len += email_len;
}
free(text);
} else
{
int email_len = strlen(address->email);
if (line_len + email_len + (next_address?1:0) > 72) /* <> and space */
{
line_len = 1;
fprintf(fh,"\n ");
}
fprintf(fh,"%s%s",address->email,next_address?",":"");
line_len += email_len;
}
address = next_address;
}
if ((header_len = ftell(fh)))
{
fseek(fh,0,SEEK_SET);
if ((header = (char*)malloc(header_len+1)))
{
fread(header,1,header_len,fh);
header[header_len]=0;
}
}
fclose(fh);
}
return header;
}
/*****************************************************************************/
char *encode_address_puny(utf8 *email)
{
string email_str;
utf8 *domain = strchr(email,'@') + 1;
utf8 *next_domain;
utf8 *end = domain + strlen(domain);
if (!string_initialize(&email_str,200))
return NULL;
next_domain = strchr(email,'@') + 1;
end = domain + strlen(domain);
string_append_part(&email_str, email, domain - email);
do
{
int last = 0;
int need_puny = 0;
/* find out the next part of the domain and check if it conatins chars > 0x7f */
next_domain = domain;
while (1)
{
unsigned char c;
c = *next_domain;
if (!c)
{
last = 1;
break;
}
if (c == '.') break;
if (c > 0x7f) need_puny = 1;
next_domain++;
}
if (need_puny)
{
char *puny;
if ((puny = utf8topunycode(domain,next_domain - domain)))
{
string_append(&email_str,"xn--");
string_append(&email_str,puny);
if (!last) string_append(&email_str,".");
free(puny);
}
} else
{
string_append_part(&email_str,domain,next_domain - domain);
if (!last) string_append(&email_str,".");
}
domain = next_domain + 1;
} while(next_domain != end);
return email_str.str;
}
/*****************************************************************************/
char *encode_address_field_utf8(const char *field_name, struct address_list *address_list)
{
struct address *address;
int field_len = strlen(field_name) + 2; /* including the ':' and the space */
int line_len;
string str;
if (!string_initialize(&str,200))
return NULL;
string_append(&str,field_name);
string_append(&str,": ");
line_len = field_len;
address = (struct address*)list_first(&address_list->list);
while (address)
{
struct address *next_address;
char *text;
char *email;
int email_len;
next_address = (struct address*)node_next(&address->node);
if (!(email = encode_address_puny(address->email)))
{
free(str.str);
return NULL;
}
email_len = strlen(email);
if ((text = encode_header_str_utf8(address->realname, &line_len, 1)))
{
string_append(&str,text);
if (line_len + email_len + 1 + (next_address?1:0) > 72) /* <>, space and possible comma */
{
line_len = 1;
string_append(&str,"\n ");
} else
{
string_append(&str," ");
line_len++;
}
string_append(&str,"<");
string_append(&str,email);
string_append(&str,">");
if (next_address) string_append(&str,",");
line_len += email_len;
free(text);
} else
{
if (line_len + email_len + (next_address?1:0) > 72) /* <> and space */
{
line_len = 1;
string_append(&str,"\n ");
}
string_append(&str,email);
if (next_address) string_append(&str,",");
line_len += email_len;
}
free(email);
address = next_address;
}
return str.str;
}
/**
* Encodes the given body quoted printable and writes it into fh
*
* @param fh
* @param buf
* @param len
*/
static void encode_body_quoted(FILE *fh, unsigned char *buf, unsigned int len)
{
int line_len = 0;
while (len > 0)
{
unsigned char *next_str = buf;
unsigned char c = *next_str;
char digit_buf[16];
int next_len = 1;
if ((c < 33 || c == 61 || c > 126) && c != 10)
{
sprintf(digit_buf,"=%02X",c);
next_str = (unsigned char*)digit_buf;
next_len = 3;
}
if (line_len + next_len > 75)
{
if (c != 10) fprintf(fh,"=\n");
else
{
/* don't soft break */
fprintf(fh,"\n");
next_len = 0;
}
line_len = 0;
}
if (next_len)
{
fwrite(next_str,1,next_len,fh);
line_len += next_len;
}
if (c==10) line_len = 0;
buf++;
len--;
}
}
/**
* Encodes the given body base64 and writes it into fh
*
* @param fh
* @param buf
* @param len
*/
static void encode_body_base64(FILE *fh, unsigned char *buf, unsigned int len)
{
int line_len = 0;
char line_buf[100];
while (len > 0)
{
if (len > 11)
{
/* could make problems with little endian */
unsigned long todecode1 = *((unsigned long*)buf);
unsigned long todecode2 = *(((unsigned long*)buf)+1);
unsigned long todecode3 = *(((unsigned long*)buf)+2);
buf += 12;
len -= 12;
#ifdef __AROS__ /* TODO: byteswaping ,will currently break arosppc , will be fixed*/
unsigned long ByteSwap1 (unsigned long nLongNumber)
{
union u {unsigned long vi; unsigned char c[sizeof(unsigned long)];};
union v {unsigned long ni; unsigned char d[sizeof(unsigned long)];};
union u un;
union v vn;
un.vi = nLongNumber;
vn.d[0]=un.c[3];
vn.d[1]=un.c[2];