mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-05 00:25:27 +00:00
263 lines
7.3 KiB
C++
263 lines
7.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* ***** BEGIN LICENSE BLOCK *****
|
|
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
|
|
*
|
|
* The contents of this file are subject to the Mozilla Public License Version
|
|
* 1.1 (the "License"); you may not use this file except in compliance with
|
|
* the License. You may obtain a copy of the License at
|
|
* http://www.mozilla.org/MPL/
|
|
*
|
|
* Software distributed under the License is distributed on an "AS IS" basis,
|
|
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
|
|
* for the specific language governing rights and limitations under the
|
|
* License.
|
|
*
|
|
* The Original Code is Mozilla Communicator client code.
|
|
*
|
|
* The Initial Developer of the Original Code is
|
|
* Netscape Communications Corporation.
|
|
* Portions created by the Initial Developer are Copyright (C) 1998
|
|
* the Initial Developer. All Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
*
|
|
* Alternatively, the contents of this file may be used under the terms of
|
|
* either of the GNU General Public License Version 2 or later (the "GPL"),
|
|
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
|
|
* in which case the provisions of the GPL or the LGPL are applicable instead
|
|
* of those above. If you wish to allow use of your version of this file only
|
|
* under the terms of either the GPL or the LGPL, and not to allow others to
|
|
* use your version of this file under the terms of the MPL, indicate your
|
|
* decision by deleting the provisions above and replace them with the notice
|
|
* and other provisions required by the GPL or the LGPL. If you do not delete
|
|
* the provisions above, a recipient may use your version of this file under
|
|
* the terms of any one of the MPL, the GPL or the LGPL.
|
|
*
|
|
* ***** END LICENSE BLOCK ***** */
|
|
|
|
#include "nsUTF7ToUnicode.h"
|
|
|
|
#define ENC_DIRECT 0
|
|
#define ENC_BASE64 1
|
|
|
|
//----------------------------------------------------------------------
|
|
// Class nsBasicUTF7Decoder [implementation]
|
|
|
|
nsBasicUTF7Decoder::nsBasicUTF7Decoder(char aLastChar, char aEscChar)
|
|
: nsBufferDecoderSupport(1)
|
|
{
|
|
mLastChar = aLastChar;
|
|
mEscChar = aEscChar;
|
|
Reset();
|
|
}
|
|
|
|
nsresult nsBasicUTF7Decoder::DecodeDirect(
|
|
const char * aSrc,
|
|
PRInt32 * aSrcLength,
|
|
PRUnichar * aDest,
|
|
PRInt32 * aDestLength)
|
|
{
|
|
const char * srcEnd = aSrc + *aSrcLength;
|
|
const char * src = aSrc;
|
|
PRUnichar * destEnd = aDest + *aDestLength;
|
|
PRUnichar * dest = aDest;
|
|
nsresult res = NS_OK;
|
|
char ch;
|
|
|
|
while (src < srcEnd) {
|
|
ch = *src;
|
|
|
|
// stop when we meet other chars or end of direct encoded seq.
|
|
// if (!(DirectEncodable(ch)) || (ch == mEscChar)) {
|
|
// but we are decoding; so we should be lax; pass everything until escchar
|
|
if (ch == mEscChar) {
|
|
res = NS_ERROR_UDEC_ILLEGALINPUT;
|
|
break;
|
|
}
|
|
|
|
if (dest >= destEnd) {
|
|
res = NS_OK_UDEC_MOREOUTPUT;
|
|
break;
|
|
} else {
|
|
*dest++ = ch;
|
|
src++;
|
|
}
|
|
}
|
|
|
|
*aSrcLength = src - aSrc;
|
|
*aDestLength = dest - aDest;
|
|
return res;
|
|
}
|
|
|
|
nsresult nsBasicUTF7Decoder::DecodeBase64(
|
|
const char * aSrc,
|
|
PRInt32 * aSrcLength,
|
|
PRUnichar * aDest,
|
|
PRInt32 * aDestLength)
|
|
{
|
|
const char * srcEnd = aSrc + *aSrcLength;
|
|
const char * src = aSrc;
|
|
PRUnichar * destEnd = aDest + *aDestLength;
|
|
PRUnichar * dest = aDest;
|
|
nsresult res = NS_OK;
|
|
char ch;
|
|
PRUint32 value;
|
|
|
|
while (src < srcEnd) {
|
|
ch = *src;
|
|
|
|
// stop when we meet other chars or end of direct encoded seq.
|
|
value = CharToValue(ch);
|
|
if (value > 0xff) {
|
|
res = NS_ERROR_UDEC_ILLEGALINPUT;
|
|
break;
|
|
}
|
|
|
|
switch (mEncStep) {
|
|
case 0:
|
|
mEncBits = value << 10;
|
|
break;
|
|
case 1:
|
|
mEncBits += value << 4;
|
|
break;
|
|
case 2:
|
|
if (dest >= destEnd) {
|
|
res = NS_OK_UDEC_MOREOUTPUT;
|
|
break;
|
|
}
|
|
mEncBits += value >> 2;
|
|
*(dest++) = (PRUnichar) mEncBits;
|
|
mEncBits = (value & 0x03) << 14;
|
|
break;
|
|
case 3:
|
|
mEncBits += value << 8;
|
|
break;
|
|
case 4:
|
|
mEncBits += value << 2;
|
|
break;
|
|
case 5:
|
|
if (dest >= destEnd) {
|
|
res = NS_OK_UDEC_MOREOUTPUT;
|
|
break;
|
|
}
|
|
mEncBits += value >> 4;
|
|
*(dest++) = (PRUnichar) mEncBits;
|
|
mEncBits = (value & 0x0f) << 12;
|
|
break;
|
|
case 6:
|
|
mEncBits += value << 6;
|
|
break;
|
|
case 7:
|
|
if (dest >= destEnd) {
|
|
res = NS_OK_UDEC_MOREOUTPUT;
|
|
break;
|
|
}
|
|
mEncBits += value;
|
|
*(dest++) = (PRUnichar) mEncBits;
|
|
mEncBits = 0;
|
|
break;
|
|
}
|
|
|
|
if (res != NS_OK) break;
|
|
|
|
src++;
|
|
(++mEncStep)%=8;
|
|
}
|
|
|
|
*aSrcLength = src - aSrc;
|
|
*aDestLength = dest - aDest;
|
|
return res;
|
|
}
|
|
|
|
PRUint32 nsBasicUTF7Decoder::CharToValue(char aChar) {
|
|
if ((aChar>='A')&&(aChar<='Z'))
|
|
return (PRUint8)(aChar-'A');
|
|
else if ((aChar>='a')&&(aChar<='z'))
|
|
return (PRUint8)(26+aChar-'a');
|
|
else if ((aChar>='0')&&(aChar<='9'))
|
|
return (PRUint8)(26+26+aChar-'0');
|
|
else if (aChar=='+')
|
|
return (PRUint8)(26+26+10);
|
|
else if (aChar==mLastChar)
|
|
return (PRUint8)(26+26+10+1);
|
|
else
|
|
return 0xffff;
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
// Subclassing of nsBufferDecoderSupport class [implementation]
|
|
|
|
NS_IMETHODIMP nsBasicUTF7Decoder::ConvertNoBuff(const char * aSrc,
|
|
PRInt32 * aSrcLength,
|
|
PRUnichar * aDest,
|
|
PRInt32 * aDestLength)
|
|
{
|
|
const char * srcEnd = aSrc + *aSrcLength;
|
|
const char * src = aSrc;
|
|
PRUnichar * destEnd = aDest + *aDestLength;
|
|
PRUnichar * dest = aDest;
|
|
PRInt32 bcr,bcw;
|
|
nsresult res = NS_OK;
|
|
char ch;
|
|
|
|
while (src < srcEnd) {
|
|
ch = *src;
|
|
|
|
// fist, attept to decode in the current mode
|
|
bcr = srcEnd - src;
|
|
bcw = destEnd - dest;
|
|
if (mEncoding == ENC_DIRECT)
|
|
res = DecodeDirect(src, &bcr, dest, &bcw);
|
|
else if ((mFreshBase64) && (*src == '-')) {
|
|
*dest = mEscChar;
|
|
bcr = 0;
|
|
bcw = 1;
|
|
res = NS_ERROR_UDEC_ILLEGALINPUT;
|
|
} else {
|
|
mFreshBase64 = PR_FALSE;
|
|
res = DecodeBase64(src, &bcr, dest, &bcw);
|
|
}
|
|
src += bcr;
|
|
dest += bcw;
|
|
|
|
// if an illegal char was encountered, test if it is an escape seq.
|
|
if (res == NS_ERROR_UDEC_ILLEGALINPUT) {
|
|
if (mEncoding == ENC_DIRECT) {
|
|
if (*src == mEscChar) {
|
|
mEncoding = ENC_BASE64;
|
|
mFreshBase64 = PR_TRUE;
|
|
mEncBits = 0;
|
|
mEncStep = 0;
|
|
src++;
|
|
res = NS_OK;
|
|
} else break;
|
|
} else {
|
|
mEncoding = ENC_DIRECT;
|
|
res = NS_OK;
|
|
// absorbe end of escape sequence
|
|
if (*src == '-') src++;
|
|
}
|
|
} else if (res != NS_OK) break;
|
|
}
|
|
|
|
*aSrcLength = src - aSrc;
|
|
*aDestLength = dest - aDest;
|
|
return res;
|
|
}
|
|
|
|
NS_IMETHODIMP nsBasicUTF7Decoder::Reset()
|
|
{
|
|
mEncoding = ENC_DIRECT;
|
|
mEncBits = 0;
|
|
mEncStep = 0;
|
|
return nsBufferDecoderSupport::Reset();
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
// Class nsUTF7ToUnicode [implementation]
|
|
|
|
nsUTF7ToUnicode::nsUTF7ToUnicode()
|
|
: nsBasicUTF7Decoder('/', '+')
|
|
{
|
|
}
|