LCOV - code coverage report
Current view: directory - netwerk/cache - nsCacheMetaData.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 86 66 76.7 %
Date: 2012-06-02 Functions: 6 5 83.3 %

       1                 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
       2                 :  *
       3                 :  * ***** BEGIN LICENSE BLOCK *****
       4                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       5                 :  *
       6                 :  * The contents of this file are subject to the Mozilla Public License Version
       7                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       8                 :  * the License. You may obtain a copy of the License at
       9                 :  * http://www.mozilla.org/MPL/
      10                 :  *
      11                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      12                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      13                 :  * for the specific language governing rights and limitations under the
      14                 :  * License.
      15                 :  *
      16                 :  * The Original Code is nsCacheMetaData.cpp, released
      17                 :  * February 22, 2001.
      18                 :  *
      19                 :  * The Initial Developer of the Original Code is
      20                 :  * Netscape Communications Corporation.
      21                 :  * Portions created by the Initial Developer are Copyright (C) 2001
      22                 :  * the Initial Developer. All Rights Reserved.
      23                 :  *
      24                 :  * Contributor(s):
      25                 :  *   Gordon Sheridan <gordon@netscape.com>
      26                 :  *
      27                 :  * Alternatively, the contents of this file may be used under the terms of
      28                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      29                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      30                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      31                 :  * of those above. If you wish to allow use of your version of this file only
      32                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      33                 :  * use your version of this file under the terms of the MPL, indicate your
      34                 :  * decision by deleting the provisions above and replace them with the notice
      35                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      36                 :  * the provisions above, a recipient may use your version of this file under
      37                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      38                 :  *
      39                 :  * ***** END LICENSE BLOCK ***** */
      40                 : 
      41                 : #include "nsCacheMetaData.h"
      42                 : #include "nsICacheEntryDescriptor.h"
      43                 : #include "prmem.h"
      44                 : 
      45                 : const char *
      46            8494 : nsCacheMetaData::GetElement(const char * key)
      47                 : {
      48            8494 :     const char * data = mBuffer;
      49            8494 :     const char * limit = mBuffer + mMetaSize;
      50                 : 
      51           30544 :     while (data < limit) {
      52                 :         // Point to the value part
      53           17289 :         const char * value = data + strlen(data) + 1;
      54           17289 :         NS_ABORT_IF_FALSE(value < limit, "Cache Metadata corrupted");
      55           17289 :         if (strcmp(data, key) == 0)
      56            3733 :             return value;
      57                 : 
      58                 :         // Skip value part
      59           13556 :         data = value + strlen(value) + 1;
      60                 :     }
      61            4761 :     NS_ABORT_IF_FALSE(data == limit, "Metadata corrupted");
      62            4761 :     return nsnull;
      63                 : }
      64                 : 
      65                 : 
      66                 : nsresult
      67            4848 : nsCacheMetaData::SetElement(const char * key,
      68                 :                             const char * value)
      69                 : {
      70            4848 :     const PRUint32 keySize = strlen(key) + 1;
      71            4848 :     char * pos = (char *)GetElement(key);
      72                 : 
      73            4848 :     if (!value) {
      74                 :         // No value means remove the key/value pair completely, if existing
      75             909 :         if (pos) {
      76             904 :             PRUint32 oldValueSize = strlen(pos) + 1;
      77             904 :             PRUint32 offset = pos - mBuffer;
      78             904 :             PRUint32 remainder = mMetaSize - (offset + oldValueSize);
      79                 : 
      80             904 :             memmove(pos - keySize, pos + oldValueSize, remainder);
      81             904 :             mMetaSize -= keySize + oldValueSize;
      82                 :         }
      83             909 :         return NS_OK;
      84                 :     }
      85                 : 
      86            3939 :     const PRUint32 valueSize = strlen(value) + 1;
      87            3939 :     PRUint32 newSize = mMetaSize + valueSize;
      88            3939 :     if (pos) {
      89             749 :         const PRUint32 oldValueSize = strlen(pos) + 1;
      90             749 :         const PRUint32 offset = pos - mBuffer;
      91             749 :         const PRUint32 remainder = mMetaSize - (offset + oldValueSize);
      92                 : 
      93                 :         // Update the value in place
      94             749 :         newSize -= oldValueSize;
      95             749 :         nsresult rv = EnsureBuffer(newSize);
      96             749 :         NS_ENSURE_SUCCESS(rv, rv);
      97                 : 
      98                 :         // Move the remainder to the right place
      99             749 :         pos = mBuffer + offset;
     100             749 :         memmove(pos + valueSize, pos + oldValueSize, remainder);
     101                 :     } else {
     102                 :         // allocate new meta data element
     103            3190 :         newSize += keySize;
     104            3190 :         nsresult rv = EnsureBuffer(newSize);
     105            3190 :         NS_ENSURE_SUCCESS(rv, rv);
     106                 : 
     107                 :         // Add after last element
     108            3190 :         pos = mBuffer + mMetaSize;
     109            3190 :         memcpy(pos, key, keySize);
     110            3190 :         pos += keySize;
     111                 :     }
     112                 : 
     113                 :     // Update value
     114            3939 :     memcpy(pos, value, valueSize);
     115            3939 :     mMetaSize = newSize;
     116                 : 
     117            3939 :     return NS_OK;
     118                 : }
     119                 : 
     120                 : nsresult
     121             691 : nsCacheMetaData::FlattenMetaData(char * buffer, PRUint32 bufSize)
     122                 : {
     123             691 :     if (mMetaSize > bufSize) {
     124               0 :         NS_ERROR("buffer size too small for meta data.");
     125               0 :         return NS_ERROR_OUT_OF_MEMORY;
     126                 :     }
     127                 : 
     128             691 :     memcpy(buffer, mBuffer, mMetaSize);
     129             691 :     return NS_OK;
     130                 : }
     131                 : 
     132                 : nsresult
     133             285 : nsCacheMetaData::UnflattenMetaData(const char * data, PRUint32 size)
     134                 : {
     135             285 :     if (data && size) {
     136                 :         // Check if the metadata ends with a zero byte.
     137             274 :         if (data[size-1] != '\0') {
     138               0 :             NS_ERROR("Cache MetaData is not null terminated");
     139               0 :             return NS_ERROR_ILLEGAL_VALUE;
     140                 :         }
     141                 :         // Check that there are an even number of zero bytes
     142                 :         // to match the pattern { key \0 value \0 }
     143             274 :         bool odd = false;
     144           58669 :         for (PRUint32 i = 0; i < size; i++) {
     145           58395 :             if (data[i] == '\0') 
     146            1352 :                 odd = !odd;
     147                 :         }
     148             274 :         if (odd) {
     149               0 :             NS_ERROR("Cache MetaData is malformed");
     150               0 :             return NS_ERROR_ILLEGAL_VALUE;
     151                 :         }
     152                 : 
     153             274 :         nsresult rv = EnsureBuffer(size);
     154             274 :         NS_ENSURE_SUCCESS(rv, rv);
     155                 : 
     156             274 :         memcpy(mBuffer, data, size);
     157             274 :         mMetaSize = size;
     158                 :     }
     159             285 :     return NS_OK;
     160                 : }
     161                 : 
     162                 : nsresult
     163               0 : nsCacheMetaData::VisitElements(nsICacheMetaDataVisitor * visitor)
     164                 : {
     165               0 :     const char * data = mBuffer;
     166               0 :     const char * limit = mBuffer + mMetaSize;
     167                 : 
     168               0 :     while (data < limit) {
     169               0 :         const char * key = data;
     170                 :         // Skip key part
     171               0 :         data += strlen(data) + 1;
     172               0 :         NS_ABORT_IF_FALSE(data < limit, "Metadata corrupted");
     173                 :         bool keepGoing;
     174               0 :         nsresult rv = visitor->VisitMetaDataElement(key, data, &keepGoing);
     175               0 :         if (NS_FAILED(rv) || !keepGoing)
     176               0 :             return NS_OK;
     177                 : 
     178                 :         // Skip value part
     179               0 :         data += strlen(data) + 1;
     180                 :     }
     181               0 :     NS_ABORT_IF_FALSE(data == limit, "Metadata corrupted");
     182               0 :     return NS_OK;
     183                 : }
     184                 : 
     185                 : nsresult
     186            4213 : nsCacheMetaData::EnsureBuffer(PRUint32 bufSize)
     187                 : {
     188            4213 :     if (mBufferSize < bufSize) {
     189            2862 :         char * buf = (char *)PR_REALLOC(mBuffer, bufSize);
     190            2862 :         if (!buf) {
     191               0 :             return NS_ERROR_OUT_OF_MEMORY;
     192                 :         }
     193            2862 :         mBuffer = buf;
     194            2862 :         mBufferSize = bufSize;
     195                 :     }
     196            4213 :     return NS_OK;
     197                 : }        

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