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authorMatt A. Tobin <email@mattatobin.com>2019-11-03 00:17:46 -0400
committerMatt A. Tobin <email@mattatobin.com>2019-11-03 00:17:46 -0400
commit302bf1b523012e11b60425d6eee1221ebc2724eb (patch)
treeb191a895f8716efcbe42f454f37597a545a6f421 /mailnews/intl/nsUTF7ToUnicode.cpp
parent21b3f6247403c06f85e1f45d219f87549862198f (diff)
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Issue #1258 - Part 1: Import mailnews, ldap, and mork from comm-esr52.9.1
Diffstat (limited to 'mailnews/intl/nsUTF7ToUnicode.cpp')
-rw-r--r--mailnews/intl/nsUTF7ToUnicode.cpp228
1 files changed, 228 insertions, 0 deletions
diff --git a/mailnews/intl/nsUTF7ToUnicode.cpp b/mailnews/intl/nsUTF7ToUnicode.cpp
new file mode 100644
index 000000000..201bcccb9
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+++ b/mailnews/intl/nsUTF7ToUnicode.cpp
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#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,
+ int32_t * aSrcLength,
+ char16_t * aDest,
+ int32_t * aDestLength)
+{
+ const char * srcEnd = aSrc + *aSrcLength;
+ const char * src = aSrc;
+ char16_t * destEnd = aDest + *aDestLength;
+ char16_t * 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,
+ int32_t * aSrcLength,
+ char16_t * aDest,
+ int32_t * aDestLength)
+{
+ const char * srcEnd = aSrc + *aSrcLength;
+ const char * src = aSrc;
+ char16_t * destEnd = aDest + *aDestLength;
+ char16_t * dest = aDest;
+ nsresult res = NS_OK;
+ char ch;
+ uint32_t 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++) = (char16_t) 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++) = (char16_t) 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++) = (char16_t) mEncBits;
+ mEncBits = 0;
+ break;
+ }
+
+ if (res != NS_OK) break;
+
+ src++;
+ (++mEncStep)%=8;
+ }
+
+ *aSrcLength = src - aSrc;
+ *aDestLength = dest - aDest;
+ return res;
+}
+
+uint32_t nsBasicUTF7Decoder::CharToValue(char aChar) {
+ if ((aChar>='A')&&(aChar<='Z'))
+ return (uint8_t)(aChar-'A');
+ else if ((aChar>='a')&&(aChar<='z'))
+ return (uint8_t)(26+aChar-'a');
+ else if ((aChar>='0')&&(aChar<='9'))
+ return (uint8_t)(26+26+aChar-'0');
+ else if (aChar=='+')
+ return (uint8_t)(26+26+10);
+ else if (aChar==mLastChar)
+ return (uint8_t)(26+26+10+1);
+ else
+ return 0xffff;
+}
+
+//----------------------------------------------------------------------
+// Subclassing of nsBufferDecoderSupport class [implementation]
+
+NS_IMETHODIMP nsBasicUTF7Decoder::ConvertNoBuff(const char * aSrc,
+ int32_t * aSrcLength,
+ char16_t * aDest,
+ int32_t * aDestLength)
+{
+ const char * srcEnd = aSrc + *aSrcLength;
+ const char * src = aSrc;
+ char16_t * destEnd = aDest + *aDestLength;
+ char16_t * dest = aDest;
+ int32_t bcr,bcw;
+ nsresult res = NS_OK;
+
+ while (src < srcEnd) {
+
+ // 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 = 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 = 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('/', '+')
+{
+}