/* Copyright (C) 2000-2005 SKYRIX Software AG This file is part of SOPE. SOPE is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. SOPE 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with SOPE; see the file COPYING. If not, write to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "NGQuotedPrintableCoding.h" #include "common.h" #include "NGMemoryAllocation.h" @implementation NSString(QuotedPrintableCoding) - (NSString *)stringByDecodingQuotedPrintable { NSData *data; unsigned len; if ((len = [self cStringLength]) > 0) { void *buf; buf = malloc(len + 10); [self getCString:buf]; data = [NSData dataWithBytes:buf length:len]; if (buf) free(buf); } else data = [NSData data]; data = [data dataByDecodingQuotedPrintable]; return [NSString stringWithCString:[data bytes] length:[data length]]; } - (NSString *)stringByEncodingQuotedPrintable { NSData *data; unsigned len; if ((len = [self cStringLength])) { void *buf; buf = malloc(len + 10); [self getCString:buf]; data = [NSData dataWithBytes:buf length:len]; free(buf); } else data = [NSData data]; data = [data dataByEncodingQuotedPrintable]; return [NSString stringWithCString:[data bytes] length:[data length]]; } @end @implementation NSData(QuotedPrintableCoding) - (NSData *)dataByDecodingQuotedPrintable { char *dest = NULL; size_t destSize = 0; size_t resSize = 0; destSize = [self length]; dest = NGMallocAtomic(destSize * sizeof(char)); resSize = NGDecodeQuotedPrintable([self bytes],[self length],dest,destSize); return ((int)resSize != -1) ? [NSData dataWithBytesNoCopy:dest length:resSize] : nil; } - (NSData *)dataByEncodingQuotedPrintable { const char *bytes = [self bytes]; unsigned int length = [self length]; char *des = NULL; unsigned int desLen = 0; desLen = length *3; des = NGMallocAtomic(sizeof(char) * desLen); desLen = NGEncodeQuotedPrintable(bytes, length, des, desLen); return (int)desLen != -1 ? [NSData dataWithBytesNoCopy:des length:desLen] : nil; } @end // implementation static inline char __hexToChar(char c) { if ((c > 47) && (c < 58)) // '0' .. '9' return c - 48; if ((c > 64) && (c < 71)) // 'A' .. 'F' return c - 55; if ((c > 96) && (c < 103)) // 'a' .. 'f' return c - 87; return -1; } int NGDecodeQuotedPrintable(const char *_src, unsigned _srcLen, char *_dest, unsigned _destLen) { unsigned cnt = 0; unsigned destCnt = 0; if (_srcLen < _destLen) return -1; for (cnt = 0; ((cnt < _srcLen) && (destCnt < _destLen)); cnt++) { if (_src[cnt] != '=') { _dest[destCnt++] = _src[cnt]; } else { if ((_srcLen - cnt) > 1) { signed char c1, c2; c1 = _src[++cnt]; if (c1 == '\r' || c1 == '\n') { if (_src[cnt+1] == '\r' || _src[cnt+1] == '\n' ) cnt++; continue; } c1 = __hexToChar(c1); c2 = __hexToChar(_src[++cnt]); if ((c1 == -1) || (c2 == -1)) { if ((_destLen - destCnt) > 1) { _dest[destCnt++] = _src[cnt - 1]; _dest[destCnt++] = _src[cnt]; } else break; } else { char c = ((c1 << 4) | c2); _dest[destCnt++] = c; } } else break; } } if (cnt < _srcLen) return -1; return destCnt; } /* From RFC 2045 Multipurpose Internet Mail Extensions 6.7. Quoted-Printable Content-Transfer-Encoding ... In this encoding, octets are to be represented as determined by the following rules: (1) (General 8bit representation) Any octet, except a CR or LF that is part of a CRLF line break of the canonical (standard) form of the data being encoded, may be represented by an "=" followed by a two digit hexadecimal representation of the octet's value. The digits of the hexadecimal alphabet, for this purpose, are "0123456789ABCDEF". Uppercase letters must be used; lowercase letters are not allowed. Thus, for example, the decimal value 12 (US-ASCII form feed) can be represented by "=0C", and the decimal value 61 (US- ASCII EQUAL SIGN) can be represented by "=3D". This rule must be followed except when the following rules allow an alternative encoding. (2) (Literal representation) Octets with decimal values of 33 through 60 inclusive, and 62 through 126, inclusive, MAY be represented as the US-ASCII characters which correspond to those octets (EXCLAMATION POINT through LESS THAN, and GREATER THAN through TILDE, respectively). (3) (White Space) Octets with values of 9 and 32 MAY be represented as US-ASCII TAB (HT) and SPACE characters, respectively, but MUST NOT be so represented at the end of an encoded line. Any TAB (HT) or SPACE characters on an encoded line MUST thus be followed on that line by a printable character. In particular, an "=" at the end of an encoded line, indicating a soft line break (see rule #5) may follow one or more TAB (HT) or SPACE characters. It follows that an octet with decimal value 9 or 32 appearing at the end of an encoded line must be represented according to Rule #1. This rule is necessary because some MTAs (Message Transport Agents, programs which transport messages from one user to another, or perform a portion of such transfers) are known to pad lines of text with SPACEs, and others are known to remove "white space" characters from the end of a line. Therefore, when decoding a Quoted-Printable body, any trailing white space on a line must be deleted, as it will necessarily have been added by intermediate transport agents. (4) (Line Breaks) A line break in a text body, represented as a CRLF sequence in the text canonical form, must be represented by a (RFC 822) line break, which is also a CRLF sequence, in the Quoted-Printable encoding. Since the canonical representation of media types other than text do not generally include the representation of line breaks as CRLF sequences, no hard line breaks (i.e. line breaks that are intended to be meaningful and to be displayed to the user) can occur in the quoted-printable encoding of such types. Sequences like "=0D", "=0A", "=0A=0D" and "=0D=0A" will routinely appear in non-text data represented in quoted- printable, of course. (5) (Soft Line Breaks) The Quoted-Printable encoding REQUIRES that encoded lines be no more than 76 characters long. If longer lines are to be encoded with the Quoted-Printable encoding, "soft" line breaks must be used. An equal sign as the last character on a encoded line indicates such a non-significant ("soft") line break in the encoded text. */ int NGEncodeQuotedPrintable(const char *_src, unsigned _srcLen, char *_dest, unsigned _destLen) { unsigned cnt = 0; unsigned destCnt = 0; char hexT[16] = {'0','1','2','3','4','5','6','7','8', '9','A','B','C','D','E','F'}; if (_srcLen > _destLen) return -1; for (cnt = 0; (cnt < _srcLen) && (destCnt < _destLen); cnt++) { char c = _src[cnt]; if ((c == 9) || (c == 10) || (c == 13) || ((c > 31) && (c < 61)) || ((c > 61) && (c < 127))) { // no quoting _dest[destCnt++] = c; } else { // need to be quoted if (_destLen - destCnt > 2) { _dest[destCnt++] = '='; _dest[destCnt++] = hexT[(c >> 4) & 15]; _dest[destCnt++] = hexT[c & 15]; } else break; } } if (cnt < _srcLen) return -1; return destCnt; } // static linking void __link_NGQuotedPrintableCoding(void) { __link_NGQuotedPrintableCoding(); }