mirror of
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328 lines
8.5 KiB
C++
328 lines
8.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the 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 Netscape Communications
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* Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#include "nsUnicodeToUTF7.h"
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#include <string.h>
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//----------------------------------------------------------------------
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// Global functions and data [declaration]
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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 nsBasicUTF7Encoder [implementation]
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nsBasicUTF7Encoder::nsBasicUTF7Encoder(char aLastChar, char aEscChar)
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: nsEncoderSupport()
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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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NS_IMETHODIMP nsBasicUTF7Encoder::FillInfo(PRUint32 *aInfo)
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{
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memset(aInfo, 0xFF, (0x10000L >> 3));
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return NS_OK;
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}
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nsresult nsBasicUTF7Encoder::ShiftEncoding(PRInt32 aEncoding,
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char * aDest,
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PRInt32 * aDestLength)
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{
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if (aEncoding == mEncoding) {
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*aDestLength = 0;
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return NS_OK;
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}
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nsresult res = NS_OK;
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char * dest = aDest;
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char * destEnd = aDest + *aDestLength;
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if (mEncStep != 0) {
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if (dest >= destEnd) return NS_OK_UENC_MOREOUTPUT;
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*(dest++)=ValueToChar(mEncBits);
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mEncStep = 0;
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mEncBits = 0;
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}
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if (dest >= destEnd) {
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res = NS_OK_UENC_MOREOUTPUT;
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} else {
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switch (aEncoding) {
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case 0:
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*(dest++) = '-';
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mEncStep = 0;
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mEncBits = 0;
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break;
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case 1:
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*(dest++) = mEscChar;
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break;
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}
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mEncoding = aEncoding;
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}
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*aDestLength = dest - aDest;
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return res;
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}
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nsresult nsBasicUTF7Encoder::EncodeDirect(
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const PRUnichar * aSrc,
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PRInt32 * aSrcLength,
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char * aDest,
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PRInt32 * aDestLength)
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{
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nsresult res = NS_OK;
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const PRUnichar * src = aSrc;
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const PRUnichar * srcEnd = aSrc + *aSrcLength;
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char * dest = aDest;
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char * destEnd = aDest + *aDestLength;
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PRUnichar ch;
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while (src < srcEnd) {
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ch = *src;
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// stop when we reach Unicode chars
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if (!DirectEncodable(ch)) break;
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if (ch == mEscChar) {
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// special case for the escape char
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if (destEnd - dest < 1) {
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res = NS_OK_UENC_MOREOUTPUT;
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break;
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} else {
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*dest++ = (char)ch;
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*dest++ = (char)'-';
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src++;
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}
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} else {
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//classic direct encoding
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if (dest >= destEnd) {
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res = NS_OK_UENC_MOREOUTPUT;
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break;
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} else {
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*dest++ = (char)ch;
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src++;
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}
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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 nsBasicUTF7Encoder::EncodeBase64(
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const PRUnichar * aSrc,
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PRInt32 * aSrcLength,
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char * aDest,
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PRInt32 * aDestLength)
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{
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nsresult res = NS_OK;
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const PRUnichar * src = aSrc;
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const PRUnichar * srcEnd = aSrc + *aSrcLength;
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char * dest = aDest;
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char * destEnd = aDest + *aDestLength;
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PRUnichar 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 reach printable US-ASCII chars
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if (DirectEncodable(ch)) break;
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switch (mEncStep) {
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case 0:
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if (destEnd - dest < 2) {
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res = NS_OK_UENC_MOREOUTPUT;
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break;
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}
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value=ch>>10;
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*(dest++)=ValueToChar(value);
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value=(ch>>4)&0x3f;
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*(dest++)=ValueToChar(value);
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mEncBits=(ch&0x0f)<<2;
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break;
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case 1:
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if (destEnd - dest < 3) {
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res = NS_OK_UENC_MOREOUTPUT;
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break;
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}
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value=mEncBits+(ch>>14);
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*(dest++)=ValueToChar(value);
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value=(ch>>8)&0x3f;
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*(dest++)=ValueToChar(value);
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value=(ch>>2)&0x3f;
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*(dest++)=ValueToChar(value);
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mEncBits=(ch&0x03)<<4;
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break;
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case 2:
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if (destEnd - dest < 3) {
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res = NS_OK_UENC_MOREOUTPUT;
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break;
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}
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value=mEncBits+(ch>>12);
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*(dest++)=ValueToChar(value);
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value=(ch>>6)&0x3f;
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*(dest++)=ValueToChar(value);
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value=ch&0x3f;
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*(dest++)=ValueToChar(value);
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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)%=3;
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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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char nsBasicUTF7Encoder::ValueToChar(PRUint32 aValue) {
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if (aValue < 26)
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return (char)('A'+aValue);
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else if (aValue < 26 + 26)
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return (char)('a' + aValue - 26);
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else if (aValue < 26 + 26 + 10)
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return (char)('0' + aValue - 26 - 26);
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else if (aValue == 26 + 26 + 10)
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return '+';
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else if (aValue == 26 + 26 + 10 + 1)
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return mLastChar;
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else
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return -1;
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}
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PRBool nsBasicUTF7Encoder::DirectEncodable(PRUnichar aChar) {
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// spec says: printable US-ASCII chars
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if ((aChar >= 0x20) && (aChar <= 0x7e)) return PR_TRUE;
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else return PR_FALSE;
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}
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//----------------------------------------------------------------------
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// Subclassing of nsEncoderSupport class [implementation]
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NS_IMETHODIMP nsBasicUTF7Encoder::ConvertNoBuffNoErr(
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const PRUnichar * aSrc,
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PRInt32 * aSrcLength,
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char * aDest,
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PRInt32 * aDestLength)
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{
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nsresult res = NS_OK;
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const PRUnichar * src = aSrc;
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const PRUnichar * srcEnd = aSrc + *aSrcLength;
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char * dest = aDest;
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char * destEnd = aDest + *aDestLength;
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PRInt32 bcr,bcw;
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PRUnichar ch;
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PRInt32 enc;
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while (src < srcEnd) {
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// find the encoding for the next char
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ch = *src;
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if (DirectEncodable(ch))
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enc = ENC_DIRECT;
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else
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enc = ENC_BASE64;
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// if necessary, shift into the required encoding
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bcw = destEnd - dest;
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res = ShiftEncoding(enc, dest, &bcw);
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dest += bcw;
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if (res != NS_OK) break;
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// now encode (as much as you can)
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bcr = srcEnd - src;
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bcw = destEnd - dest;
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if (enc == ENC_DIRECT)
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res = EncodeDirect(src, &bcr, dest, &bcw);
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else
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res = EncodeBase64(src, &bcr, dest, &bcw);
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src += bcr;
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dest += bcw;
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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 nsBasicUTF7Encoder::FinishNoBuff(char * aDest,
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PRInt32 * aDestLength)
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{
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return ShiftEncoding(ENC_DIRECT, aDest, aDestLength);
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}
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NS_IMETHODIMP nsBasicUTF7Encoder::GetMaxLength(const PRUnichar * aSrc,
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PRInt32 aSrcLength,
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PRInt32 * aDestLength)
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{
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// worst case
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*aDestLength = 5*aSrcLength;
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return NS_OK;
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}
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NS_IMETHODIMP nsBasicUTF7Encoder::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 nsEncoderSupport::Reset();
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}
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//----------------------------------------------------------------------
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// Class nsUnicodeToUTF7 [implementation]
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nsUnicodeToUTF7::nsUnicodeToUTF7()
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: nsBasicUTF7Encoder('/', '+')
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{
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}
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nsresult nsUnicodeToUTF7::CreateInstance(nsISupports ** aResult)
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{
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*aResult = (nsIUnicodeEncoder*) new nsUnicodeToUTF7();
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return (*aResult == NULL)? NS_ERROR_OUT_OF_MEMORY : NS_OK;
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}
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PRBool nsUnicodeToUTF7::DirectEncodable(PRUnichar aChar) {
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if ((aChar >= 'A') && (aChar <= 'Z')) return PR_TRUE;
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else if ((aChar >= 'a') && (aChar <= 'z')) return PR_TRUE;
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else if ((aChar >= '0') && (aChar <= '9')) return PR_TRUE;
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else if ((aChar >= 39) && (aChar <= 41)) return PR_TRUE;
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else if ((aChar >= 44) && (aChar <= 47)) return PR_TRUE;
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else if (aChar == 58) return PR_TRUE;
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else if (aChar == 63) return PR_TRUE;
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else if (aChar == ' ') return PR_TRUE;
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else if (aChar == 9) return PR_TRUE;
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else if (aChar == 13) return PR_TRUE;
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else if (aChar == 10) return PR_TRUE;
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else return PR_FALSE;
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}
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