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