The Tor Browser: intl/unicharutil/src/nsSaveAsCharset.cpp@fc2d59ddac77 (annotated)

intl/unicharutil/src/nsSaveAsCharset.cpp@fc2d59ddac77 (annotated)

intl/unicharutil/src/nsSaveAsCharset.cpp

Wed, 31 Dec 2014 07:22:50 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 07:22:50 +0100
branch: TOR_BUG_3246
changeset 4: fc2d59ddac77
permissions: -rw-r--r--

Correct previous dual key logic pending first delivery installment.

 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
 /* 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 "prmem.h"
 #include "prprf.h"
 #include "nsICharsetConverterManager.h"
 #include "nsSaveAsCharset.h"
 #include "nsWhitespaceTokenizer.h"
 #include "nsServiceManagerUtils.h"
 //
 // nsISupports methods
 //
 NS_IMPL_ISUPPORTS(nsSaveAsCharset, nsISaveAsCharset)
 //
 // nsSaveAsCharset
 //
 nsSaveAsCharset::nsSaveAsCharset()
 {
   mAttribute = attr_htmlTextDefault;
   mEntityVersion = 0;
   mCharsetListIndex = -1;
 }
 nsSaveAsCharset::~nsSaveAsCharset()
 {
 }
 NS_IMETHODIMP
 nsSaveAsCharset::Init(const char *charset, uint32_t attr, uint32_t entityVersion)
 {
   nsresult rv = NS_OK;
   mAttribute = attr;
   mEntityVersion = entityVersion;
   rv = SetupCharsetList(charset);
   NS_ENSURE_SUCCESS(rv, rv);
   // set up unicode encoder
   rv = SetupUnicodeEncoder(GetNextCharset());
   NS_ENSURE_SUCCESS(rv, rv);
   // set up entity converter
   if (attr_EntityNone != MASK_ENTITY(mAttribute) && !mEntityConverter)
     mEntityConverter = do_CreateInstance(NS_ENTITYCONVERTER_CONTRACTID, &rv);
   return rv;
 }
 NS_IMETHODIMP
 nsSaveAsCharset::Convert(const char16_t *inString, char **_retval)
 {
   NS_ENSURE_ARG_POINTER(_retval);
   NS_ENSURE_ARG_POINTER(inString);
   if (0 == *inString)
     return NS_ERROR_ILLEGAL_VALUE;
   nsresult rv = NS_OK;
   NS_ASSERTION(mEncoder, "need to call Init() before Convert()");
   NS_ENSURE_TRUE(mEncoder, NS_ERROR_FAILURE);
   *_retval = nullptr;
   // make sure to start from the first charset in the list
   if (mCharsetListIndex > 0) {
     mCharsetListIndex = -1;
     rv = SetupUnicodeEncoder(GetNextCharset());
     NS_ENSURE_SUCCESS(rv, rv);
   }
   do {
     // fallback to the next charset in the list if the last conversion failed by an unmapped character
     if (MASK_CHARSET_FALLBACK(mAttribute) && NS_ERROR_UENC_NOMAPPING == rv) {
       const char * charset = GetNextCharset();
       if (!charset)
         break;
       rv = SetupUnicodeEncoder(charset);
       NS_ENSURE_SUCCESS(rv, rv);
       PR_FREEIF(*_retval);
     }
     if (attr_EntityBeforeCharsetConv == MASK_ENTITY(mAttribute)) {
       NS_ASSERTION(mEntityConverter, "need to call Init() before Convert()");
       NS_ENSURE_TRUE(mEntityConverter, NS_ERROR_FAILURE);
       char16_t *entity = nullptr;
       // do the entity conversion first
       rv = mEntityConverter->ConvertToEntities(inString, mEntityVersion, &entity);
       if(NS_SUCCEEDED(rv)) {
         rv = DoCharsetConversion(entity, _retval);
         nsMemory::Free(entity);
       }
     }
     else
       rv = DoCharsetConversion(inString, _retval);
   } while (MASK_CHARSET_FALLBACK(mAttribute) && NS_ERROR_UENC_NOMAPPING == rv);
   return rv;
 }
 NS_IMETHODIMP
 nsSaveAsCharset::GetCharset(char * *aCharset)
 {
   NS_ENSURE_ARG(aCharset);
   NS_ASSERTION(mCharsetListIndex >= 0, "need to call Init() first");
   NS_ENSURE_TRUE(mCharsetListIndex >= 0, NS_ERROR_FAILURE);
   const char* charset = mCharsetList[mCharsetListIndex].get();
   if (!charset) {
     *aCharset = nullptr;
     NS_ASSERTION(charset, "make sure to call Init() with non empty charset list");
     return NS_ERROR_FAILURE;
   }
   *aCharset = strdup(charset);
   return (*aCharset) ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
 }
 /////////////////////////////////////////////////////////////////////////////////////////
 #define RESERVE_FALLBACK_BYTES 512
 // do the fallback, reallocate the buffer if necessary
 // need to pass destination buffer info (size, current position and estimation of rest of the conversion)
 NS_IMETHODIMP
 nsSaveAsCharset::HandleFallBack(uint32_t character, char **outString, int32_t *bufferLength,
                                 int32_t *currentPos, int32_t estimatedLength)
 {
   NS_ENSURE_ARG_POINTER(outString);
   NS_ENSURE_ARG_POINTER(bufferLength);
   NS_ENSURE_ARG_POINTER(currentPos);
   char fallbackStr[256];
   nsresult rv = DoConversionFallBack(character, fallbackStr, 256);
   if (NS_SUCCEEDED(rv)) {
     int32_t tempLen = (int32_t) strlen(fallbackStr);
     // reallocate if the buffer is not large enough
     if ((tempLen + estimatedLength) >= (*bufferLength - *currentPos)) {
       int32_t addLength = tempLen + RESERVE_FALLBACK_BYTES;
       // + 1 is for the terminating NUL, don't add that to bufferLength
       char *temp = (char *) PR_Realloc(*outString, *bufferLength + addLength + 1);
       if (temp) {
         // adjust length/pointer after realloc
         *bufferLength += addLength;
         *outString = temp;
       } else {
         *outString = nullptr;
         *bufferLength = 0;
         return NS_ERROR_OUT_OF_MEMORY;
       }
     }
     memcpy((*outString + *currentPos), fallbackStr, tempLen);
     *currentPos += tempLen;
   }
   return rv;
 }
 NS_IMETHODIMP
 nsSaveAsCharset::DoCharsetConversion(const char16_t *inString, char **outString)
 {
   NS_ENSURE_ARG_POINTER(outString);
   *outString = nullptr;
   nsresult rv;
   int32_t inStringLength = NS_strlen(inString);       // original input string length
   int32_t bufferLength;                               // allocated buffer length
   int32_t srcLength = inStringLength;
   int32_t dstLength;
   int32_t pos1, pos2;
   nsresult saveResult = NS_OK;                         // to remember NS_ERROR_UENC_NOMAPPING
   // estimate and allocate the target buffer (reserve extra memory for fallback)
   rv = mEncoder->GetMaxLength(inString, inStringLength, &dstLength);
   if (NS_FAILED(rv)) return rv;
   bufferLength = dstLength + RESERVE_FALLBACK_BYTES; // extra bytes for fallback
   // + 1 is for the terminating NUL -- we don't add that to bufferLength so that
   // we can always write dstPtr[pos2] = '\0' even when the encoder filled the
   // buffer.
   char *dstPtr = (char *) PR_Malloc(bufferLength + 1);
   if (!dstPtr) {
     return NS_ERROR_OUT_OF_MEMORY;
   }
   for (pos1 = 0, pos2 = 0; pos1 < inStringLength;) {
     // convert from unicode
     dstLength = bufferLength - pos2;
     NS_ASSERTION(dstLength >= 0, "out of bounds write");
     rv = mEncoder->Convert(&inString[pos1], &srcLength, &dstPtr[pos2], &dstLength);
     pos1 += srcLength ? srcLength : 1;
     pos2 += dstLength;
     dstPtr[pos2] = '\0';
     // break: this is usually the case (no error) OR unrecoverable error
     if (NS_ERROR_UENC_NOMAPPING != rv) break;
     // remember this happened and reset the result
     saveResult = rv;
     rv = NS_OK;
     // finish encoder, give it a chance to write extra data like escape sequences
     dstLength = bufferLength - pos2;
     rv = mEncoder->Finish(&dstPtr[pos2], &dstLength);
     if (NS_SUCCEEDED(rv)) {
       pos2 += dstLength;
       dstPtr[pos2] = '\0';
     }
     srcLength = inStringLength - pos1;
     // do the fallback
     if (!ATTR_NO_FALLBACK(mAttribute)) {
       uint32_t unMappedChar;
       if (NS_IS_HIGH_SURROGATE(inString[pos1-1]) &&
           inStringLength > pos1 && NS_IS_LOW_SURROGATE(inString[pos1])) {
         unMappedChar = SURROGATE_TO_UCS4(inString[pos1-1], inString[pos1]);
         pos1++;
       } else {
         unMappedChar = inString[pos1-1];
       }
       rv = mEncoder->GetMaxLength(inString+pos1, inStringLength-pos1, &dstLength);
       if (NS_FAILED(rv))
         break;
       rv = HandleFallBack(unMappedChar, &dstPtr, &bufferLength, &pos2, dstLength);
       if (NS_FAILED(rv))
         break;
       dstPtr[pos2] = '\0';
     }
   }
   if (NS_SUCCEEDED(rv)) {
     // finish encoder, give it a chance to write extra data like escape sequences
     dstLength = bufferLength - pos2;
     rv = mEncoder->Finish(&dstPtr[pos2], &dstLength);
     if (NS_SUCCEEDED(rv)) {
       pos2 += dstLength;
       dstPtr[pos2] = '\0';
     }
   }
   if (NS_FAILED(rv)) {
     PR_FREEIF(dstPtr);
     return rv;
   }
   *outString = dstPtr;      // set the result string
   // set error code so that the caller can do own fall back
   if (NS_ERROR_UENC_NOMAPPING == saveResult) {
     rv = NS_ERROR_UENC_NOMAPPING;
   }
   return rv;
 }
 NS_IMETHODIMP
 nsSaveAsCharset::DoConversionFallBack(uint32_t inUCS4, char *outString, int32_t bufferLength)
 {
   NS_ENSURE_ARG_POINTER(outString);
   *outString = '\0';
   nsresult rv = NS_OK;
   if (ATTR_NO_FALLBACK(mAttribute)) {
     return NS_OK;
   }
   if (attr_EntityAfterCharsetConv == MASK_ENTITY(mAttribute)) {
     char *entity = nullptr;
     rv = mEntityConverter->ConvertUTF32ToEntity(inUCS4, mEntityVersion, &entity);
     if (NS_SUCCEEDED(rv)) {
       if (!entity || (int32_t)strlen(entity) > bufferLength) {
         return NS_ERROR_OUT_OF_MEMORY;
       }
       PL_strcpy(outString, entity);
       nsMemory::Free(entity);
       return rv;
     }
   }
   switch (MASK_FALLBACK(mAttribute)) {
   case attr_FallbackQuestionMark:
     if(bufferLength>=2) {
       *outString++='?';
       *outString='\0';
       rv = NS_OK;
     } else {
       rv = NS_ERROR_FAILURE;
     }
     break;
   case attr_FallbackEscapeU:
     if (inUCS4 & 0xff0000)
       rv = (PR_snprintf(outString, bufferLength, "\\u%.6x", inUCS4) > 0) ? NS_OK : NS_ERROR_FAILURE;
     else
       rv = (PR_snprintf(outString, bufferLength, "\\u%.4x", inUCS4) > 0) ? NS_OK : NS_ERROR_FAILURE;
     break;
   case attr_FallbackDecimalNCR:
     rv = ( PR_snprintf(outString, bufferLength, "&#%u;", inUCS4) > 0) ? NS_OK : NS_ERROR_FAILURE;
     break;
   case attr_FallbackHexNCR:
     rv = (PR_snprintf(outString, bufferLength, "&#x%x;", inUCS4) > 0) ? NS_OK : NS_ERROR_FAILURE;
     break;
   case attr_FallbackNone:
     rv = NS_OK;
     break;
   default:
     rv = NS_ERROR_ILLEGAL_VALUE;
     break;
   }
 	return rv;
 }
 nsresult nsSaveAsCharset::SetupUnicodeEncoder(const char* charset)
 {
   NS_ENSURE_ARG(charset);
   nsresult rv;
   // set up unicode encoder
   nsCOMPtr <nsICharsetConverterManager> ccm = do_GetService(NS_CHARSETCONVERTERMANAGER_CONTRACTID, &rv);
   NS_ENSURE_SUCCESS(rv, rv);
   return ccm->GetUnicodeEncoder(charset, getter_AddRefs(mEncoder));
 }
 nsresult nsSaveAsCharset::SetupCharsetList(const char *charsetList)
 {
   NS_ENSURE_ARG(charsetList);
   NS_ASSERTION(charsetList[0], "charsetList should not be empty");
   if (!charsetList[0])
     return NS_ERROR_INVALID_ARG;
   if (mCharsetListIndex >= 0) {
     mCharsetList.Clear();
     mCharsetListIndex = -1;
   }
   nsCWhitespaceTokenizer tokenizer = nsDependentCString(charsetList);
   while (tokenizer.hasMoreTokens()) {
     ParseString(tokenizer.nextToken(), ',', mCharsetList);
   }
   return NS_OK;
 }
 const char * nsSaveAsCharset::GetNextCharset()
 {
   if ((mCharsetListIndex + 1) >= int32_t(mCharsetList.Length()))
     return nullptr;
   // bump the index and return the next charset
   return mCharsetList[++mCharsetListIndex].get();
 }

The Tor Browser / annotate

intl/unicharutil/src/nsSaveAsCharset.cpp@fc2d59ddac77 (annotated)

intl/unicharutil/src/nsSaveAsCharset.cpp