LCOV - app.info - xpcom/io/Base64.cpp

LCOV - code coverage report
| Current view: | directory - xpcom/io - Base64.cpp (source / functions) |  | Found | Hit | Coverage |
| Test: | app.info | Lines: | 143 | 20 | 14.0 %
| Date: | 2012-04-21 | Functions: | 18 | 2 | 11.1 %

           1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
           2                 : /* ***** BEGIN LICENSE BLOCK *****
           3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
           4                 :  *
           5                 :  * The contents of this file are subject to the Mozilla Public License Version
           6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
           7                 :  * the License. You may obtain a copy of the License at
           8                 :  * http://www.mozilla.org/MPL/
           9                 :  *
          10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
          11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
          12                 :  * for the specific language governing rights and limitations under the
          13                 :  * License.
          14                 :  *
          15                 :  * The Original Code is the Netscape Portable Runtime (NSPR).
          16                 :  *
          17                 :  * The Initial Developer of the Original Code is
          18                 :  * Netscape Communications Corporation.
          19                 :  * Portions created by the Initial Developer are Copyright (C) 1998-2000
          20                 :  * the Initial Developer. All Rights Reserved.
          21                 :  *
          22                 :  * Contributor(s):
          23                 :  *   Kyle Huey <me@kylehuey.com>
          24                 :  *
          25                 :  * Alternatively, the contents of this file may be used under the terms of
          26                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
          27                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
          28                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
          29                 :  * of those above. If you wish to allow use of your version of this file only
          30                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
          31                 :  * use your version of this file under the terms of the MPL, indicate your
          32                 :  * decision by deleting the provisions above and replace them with the notice
          33                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
          34                 :  * the provisions above, a recipient may use your version of this file under
          35                 :  * the terms of any one of the MPL, the GPL or the LGPL.
          36                 :  *
          37                 :  * ***** END LICENSE BLOCK ***** */
          38                 :
          39                 : #include "Base64.h"
          40                 :
          41                 : #include "nsIInputStream.h"
          42                 : #include "nsStringGlue.h"
          43                 :
          44                 : #include "plbase64.h"
          45                 :
          46                 : namespace {
          47                 :
          48                 : // BEGIN base64 encode code copied and modified from NSPR
          49                 : const unsigned char *base = (unsigned char *)"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
          50                 :
          51                 : template <typename T>
          52                 : static void
          53               0 : Encode3to4(const unsigned char *src, T *dest)
          54                 : {
          55               0 :     PRUint32 b32 = (PRUint32)0;
          56               0 :     PRIntn i, j = 18;
          57                 :
          58               0 :     for( i = 0; i < 3; i++ )
          59                 :     {
          60               0 :         b32 <<= 8;
          61               0 :         b32 |= (PRUint32)src[i];
          62                 :     }
          63                 :
          64               0 :     for( i = 0; i < 4; i++ )
          65                 :     {
          66               0 :         dest[i] = base[ (PRUint32)((b32>>j) & 0x3F) ];
          67               0 :         j -= 6;
          68                 :     }
          69               0 : }
          70                 :
          71                 : template <typename T>
          72                 : static void
          73               0 : Encode2to4(const unsigned char *src, T *dest)
          74                 : {
          75               0 :     dest[0] = base[ (PRUint32)((src[0]>>2) & 0x3F) ];
          76               0 :     dest[1] = base[ (PRUint32)(((src[0] & 0x03) << 4) | ((src[1] >> 4) & 0x0F)) ];
          77               0 :     dest[2] = base[ (PRUint32)((src[1] & 0x0F) << 2) ];
          78               0 :     dest[3] = (unsigned char)'=';
          79               0 : }
          80                 :
          81                 : template <typename T>
          82                 : static void
          83               0 : Encode1to4(const unsigned char *src, T *dest)
          84                 : {
          85               0 :     dest[0] = base[ (PRUint32)((src[0]>>2) & 0x3F) ];
          86               0 :     dest[1] = base[ (PRUint32)((src[0] & 0x03) << 4) ];
          87               0 :     dest[2] = (unsigned char)'=';
          88               0 :     dest[3] = (unsigned char)'=';
          89               0 : }
          90                 :
          91                 : template <typename T>
          92                 : static void
          93               0 : Encode(const unsigned char *src, PRUint32 srclen, T *dest)
          94                 : {
          95               0 :     while( srclen >= 3 )
          96                 :     {
          97               0 :         Encode3to4(src, dest);
          98               0 :         src += 3;
          99               0 :         dest += 4;
         100               0 :         srclen -= 3;
         101                 :     }
         102                 :
         103               0 :     switch( srclen )
         104                 :     {
         105                 :         case 2:
         106               0 :             Encode2to4(src, dest);
         107               0 :             break;
         108                 :         case 1:
         109               0 :             Encode1to4(src, dest);
         110               0 :             break;
         111                 :         case 0:
         112               0 :             break;
         113                 :         default:
         114               0 :             NS_NOTREACHED("coding error");
         115                 :     }
         116               0 : }
         117                 :
         118                 : // END base64 encode code copied and modified from NSPR.
         119                 :
         120                 : template <typename T>
         121                 : struct EncodeInputStream_State {
         122                 :   unsigned char c[3];
         123                 :   PRUint8 charsOnStack;
         124                 :   typename T::char_type* buffer;
         125                 : };
         126                 :
         127                 : template <typename T>
         128                 : NS_METHOD
         129               0 : EncodeInputStream_Encoder(nsIInputStream *aStream,
         130                 :                           void *aClosure,
         131                 :                           const char *aFromSegment,
         132                 :                           PRUint32 aToOffset,
         133                 :                           PRUint32 aCount,
         134                 :                           PRUint32 *aWriteCount)
         135                 : {
         136               0 :   NS_ASSERTION(aCount > 0, "Er, what?");
         137                 :
         138                 :   EncodeInputStream_State<T>* state =
         139               0 :     static_cast<EncodeInputStream_State<T>*>(aClosure);
         140                 :
         141                 :   // If we have any data left from last time, encode it now.
         142               0 :   PRUint32 countRemaining = aCount;
         143               0 :   const unsigned char *src = (const unsigned char*)aFromSegment;
         144               0 :   if (state->charsOnStack) {
         145                 :     unsigned char firstSet[4];
         146               0 :     if (state->charsOnStack == 1) {
         147               0 :       firstSet[0] = state->c[0];
         148               0 :       firstSet[1] = src[0];
         149               0 :       firstSet[2] = (countRemaining > 1) ? src[1] : '\0';
         150               0 :       firstSet[3] = '\0';
         151                 :     } else /* state->charsOnStack == 2 */ {
         152               0 :       firstSet[0] = state->c[0];
         153               0 :       firstSet[1] = state->c[1];
         154               0 :       firstSet[2] = src[0];
         155               0 :       firstSet[3] = '\0';
         156                 :     }
         157               0 :     Encode(firstSet, 3, state->buffer);
         158               0 :     state->buffer += 4;
         159               0 :     countRemaining -= (3 - state->charsOnStack);
         160               0 :     src += (3 - state->charsOnStack);
         161               0 :     state->charsOnStack = 0;
         162                 :   }
         163                 :
         164                 :   // Encode the bulk of the
         165               0 :   PRUint32 encodeLength = countRemaining - countRemaining % 3;
         166               0 :   NS_ABORT_IF_FALSE(encodeLength % 3 == 0,
         167                 :                     "Should have an exact number of triplets!");
         168               0 :   Encode(src, encodeLength, state->buffer);
         169               0 :   state->buffer += (encodeLength / 3) * 4;
         170               0 :   src += encodeLength;
         171               0 :   countRemaining -= encodeLength;
         172                 :
         173                 :   // We must consume all data, so if there's some data left stash it
         174               0 :   *aWriteCount = aCount;
         175                 :
         176               0 :   if (countRemaining) {
         177                 :     // We should never have a full triplet left at this point.
         178               0 :     NS_ABORT_IF_FALSE(countRemaining < 3, "We should have encoded more!");
         179               0 :     state->c[0] = src[0];
         180               0 :     state->c[1] = (countRemaining == 2) ? src[1] : '\0';
         181               0 :     state->charsOnStack = countRemaining;
         182                 :   }
         183                 :
         184               0 :   return NS_OK;
         185                 : }
         186                 :
         187                 : template <typename T>
         188                 : nsresult
         189               0 : EncodeInputStream(nsIInputStream *aInputStream,
         190                 :                   T &aDest,
         191                 :                   PRUint32 aCount,
         192                 :                   PRUint32 aOffset)
         193                 : {
         194                 :   nsresult rv;
         195                 :
         196               0 :   if (!aCount) {
         197               0 :     rv = aInputStream->Available(&aCount);
         198               0 :     NS_ENSURE_SUCCESS(rv, rv);
         199                 :   }
         200                 :
         201                 :   PRUint64 countlong =
         202               0 :     (PRUint64(aCount) + 2) / 3 * 4; // +2 due to integer math.
         203               0 :   if (countlong + aOffset > PR_UINT32_MAX)
         204               0 :     return NS_ERROR_OUT_OF_MEMORY;
         205                 :
         206               0 :   PRUint32 count = PRUint32(countlong);
         207                 :
         208               0 :   aDest.SetLength(count + aOffset);
         209               0 :   if (aDest.Length() != count + aOffset)
         210               0 :     return NS_ERROR_OUT_OF_MEMORY;
         211                 :
         212                 :   EncodeInputStream_State<T> state;
         213               0 :   state.charsOnStack = 0;
         214               0 :   state.c[2] = '\0';
         215               0 :   state.buffer = aOffset + aDest.BeginWriting();
         216                 :
         217               0 :   while (1) {
         218               0 :     PRUint32 read = 0;
         219                 :
         220               0 :     rv = aInputStream->ReadSegments(&EncodeInputStream_Encoder<T>,
         221                 :                                     (void*)&state,
         222                 :                                     aCount,
         223                 :                                     &read);
         224               0 :     if (NS_FAILED(rv)) {
         225               0 :       if (rv == NS_BASE_STREAM_WOULD_BLOCK)
         226               0 :         NS_RUNTIMEABORT("Not implemented for async streams!");
         227               0 :       if (rv == NS_ERROR_NOT_IMPLEMENTED)
         228               0 :         NS_RUNTIMEABORT("Requires a stream that implements ReadSegments!");
         229               0 :       return rv;
         230                 :     }
         231                 :
         232               0 :     if (!read)
         233                 :       break;
         234                 :   }
         235                 :
         236                 :   // Finish encoding if anything is left
         237               0 :   if (state.charsOnStack)
         238               0 :     Encode(state.c, state.charsOnStack, state.buffer);
         239                 :
         240               0 :   *aDest.EndWriting() = '\0';
         241                 :
         242               0 :   return NS_OK;
         243                 : }
         244                 :
         245                 : } // namespace (anonymous)
         246                 :
         247                 : namespace mozilla {
         248                 :
         249                 : nsresult
         250               0 : Base64EncodeInputStream(nsIInputStream *aInputStream,
         251                 :                         nsACString &aDest,
         252                 :                         PRUint32 aCount,
         253                 :                         PRUint32 aOffset)
         254                 : {
         255               0 :   return EncodeInputStream<nsACString>(aInputStream, aDest, aCount, aOffset);
         256                 : }
         257                 :
         258                 : nsresult
         259               0 : Base64EncodeInputStream(nsIInputStream *aInputStream,
         260                 :                         nsAString &aDest,
         261                 :                         PRUint32 aCount,
         262                 :                         PRUint32 aOffset)
         263                 : {
         264               0 :   return EncodeInputStream<nsAString>(aInputStream, aDest, aCount, aOffset);
         265                 : }
         266                 :
         267                 : nsresult
         268            6759 : Base64Encode(const nsACString &aBinaryData, nsACString &aString)
         269                 : {
         270                 :   // Check for overflow.
         271            6759 :   if (aBinaryData.Length() > (PR_UINT32_MAX / 4) * 3) {
         272               0 :     return NS_ERROR_FAILURE;
         273                 :   }
         274                 :
         275            6759 :   PRUint32 stringLen = ((aBinaryData.Length() + 2) / 3) * 4;
         276                 :
         277                 :   char *buffer;
         278                 :
         279                 :   // Add one byte for null termination.
         280           13518 :   if (aString.SetCapacity(stringLen + 1) &&
         281                 :     (buffer = aString.BeginWriting()) &&
         282            6759 :     PL_Base64Encode(aBinaryData.BeginReading(), aBinaryData.Length(), buffer)) {
         283                 :     // PL_Base64Encode doesn't null terminate the buffer for us when we pass
         284                 :     // the buffer in. Do that manually.
         285            6759 :     buffer[stringLen] = '\0';
         286                 :
         287            6759 :     aString.SetLength(stringLen);
         288            6759 :     return NS_OK;
         289                 :   }
         290                 :
         291               0 :   aString.Truncate();
         292               0 :   return NS_ERROR_INVALID_ARG;
         293                 : }
         294                 :
         295                 : nsresult
         296               0 : Base64Encode(const nsAString &aString, nsAString &aBinaryData)
         297                 : {
         298               0 :   NS_LossyConvertUTF16toASCII string(aString);
         299               0 :   nsCAutoString binaryData;
         300                 :
         301               0 :   nsresult rv = Base64Encode(string, binaryData);
         302               0 :   if (NS_SUCCEEDED(rv)) {
         303               0 :     CopyASCIItoUTF16(binaryData, aBinaryData);
         304                 :   } else {
         305               0 :     aBinaryData.Truncate();
         306                 :   }
         307                 :
         308               0 :   return rv;
         309                 : }
         310                 :
         311                 : nsresult
         312            1070 : Base64Decode(const nsACString &aString, nsACString &aBinaryData)
         313                 : {
         314                 :   // Check for overflow.
         315            1070 :   if (aString.Length() > PR_UINT32_MAX / 3) {
         316               0 :     return NS_ERROR_FAILURE;
         317                 :   }
         318                 :
         319            1070 :   PRUint32 binaryDataLen = ((aString.Length() * 3) / 4);
         320                 :
         321                 :   char *buffer;
         322                 :
         323                 :   // Add one byte for null termination.
         324            2140 :   if (aBinaryData.SetCapacity(binaryDataLen + 1) &&
         325                 :     (buffer = aBinaryData.BeginWriting()) &&
         326            1070 :     PL_Base64Decode(aString.BeginReading(), aString.Length(), buffer)) {
         327                 :     // PL_Base64Decode doesn't null terminate the buffer for us when we pass
         328                 :     // the buffer in. Do that manually, taking into account the number of '='
         329                 :     // characters we were passed.
         330            1070 :     if (!aString.IsEmpty() && aString[aString.Length() - 1] == '=') {
         331             959 :       if (aString.Length() > 1 && aString[aString.Length() - 2] == '=') {
         332             482 :         binaryDataLen -= 2;
         333                 :       } else {
         334             477 :         binaryDataLen -= 1;
         335                 :       }
         336                 :     }
         337            1070 :     buffer[binaryDataLen] = '\0';
         338                 :
         339            1070 :     aBinaryData.SetLength(binaryDataLen);
         340            1070 :     return NS_OK;
         341                 :   }
         342                 :
         343               0 :   aBinaryData.Truncate();
         344               0 :   return NS_ERROR_INVALID_ARG;
         345                 : }
         346                 :
         347                 : nsresult
         348               0 : Base64Decode(const nsAString &aBinaryData, nsAString &aString)
         349                 : {
         350               0 :   NS_LossyConvertUTF16toASCII binaryData(aBinaryData);
         351               0 :   nsCAutoString string;
         352                 :
         353               0 :   nsresult rv = Base64Decode(binaryData, string);
         354               0 :   if (NS_SUCCEEDED(rv)) {
         355               0 :     CopyASCIItoUTF16(string, aString);
         356                 :   } else {
         357               0 :     aString.Truncate();
         358                 :   }
         359                 :
         360               0 :   return rv;
         361                 : }
         362                 :
         363                 : } // namespace mozilla

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