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      1 /*
      2  * Copyright (C) 2014 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 /*==================================================================================================
     18 
     19     Source Name: dmMetaDataBuffer.cc
     20 
     21     General Description: Implementation of the DMMetaDataBuffer class
     22 
     23 ==================================================================================================*/
     24 
     25 #include "dm_uri_utils.h"
     26 #include "dmStringUtil.h"
     27 #include "dmMetaDataBuffer.h"
     28 
     29 UINT32  DMMetaDataBuffer::m_bCorrupted = 0;  // due to multiple passing by value, it's reasonable to use static
     30 
     31 
     32 DMMetaDataBuffer::DMMetaDataBuffer()
     33   {
     34     m_pBuffer = NULL;
     35     m_nOffset = 0;
     36 #ifndef DM_IGNORE_BMDF_VERIFICATION
     37     m_nFilesSize = 0;
     38 #endif
     39  }
     40 
     41 DMMetaDataBuffer::DMMetaDataBuffer(MDF_BUFFER_T pBuffer)
     42   {
     43     m_pBuffer = pBuffer;
     44     m_nOffset = 0;
     45 #ifndef DM_IGNORE_BMDF_VERIFICATION
     46     m_nFilesSize = ReadUINT32();
     47     m_nOffset = 0;
     48 #endif
     49   }
     50 
     51 
     52 
     53 CPCHAR DMMetaDataBuffer::ReadString()
     54 {
     55   UINT32 offset = ReadUINT32();
     56 
     57 #ifndef DM_IGNORE_BMDF_VERIFICATION
     58   if ( offset >= m_nFilesSize ) {
     59     m_bCorrupted = 1;
     60     return "";
     61   }
     62 #endif
     63   CPCHAR str = (CPCHAR)(m_pBuffer + offset);
     64   return str;
     65 }
     66 
     67 
     68 UINT16 DMMetaDataBuffer::ReadUINT16()
     69 {
     70     UINT16 value = 0;
     71 
     72     for (UINT32 i=0; i<sizeof(UINT16); i++)
     73     {
     74         value |= (*(m_pBuffer+m_nOffset)) << (i*8);
     75         m_nOffset++;
     76     }
     77     return value;
     78   }
     79 
     80 
     81 UINT32 DMMetaDataBuffer::ReadUINT32()
     82 {
     83   UINT32 value = 0;
     84 
     85   for (int i=0; i<sizeof(UINT32); i++)
     86   {
     87     value |= (*(m_pBuffer + m_nOffset)) << (i*8);
     88     m_nOffset++;
     89   }
     90   return value;
     91 }
     92 
     93 FLOAT DMMetaDataBuffer::ReadFLOAT()
     94 {
     95   FLOAT value = 0;
     96   UINT8 *ptr = (UINT8 *)&value;
     97   UINT8 len = sizeof(FLOAT) - 1;
     98 
     99   for (int i=0; i<=len; i++)
    100   {
    101     *(ptr+i) = *(m_pBuffer+m_nOffset);
    102     m_nOffset++;
    103   }
    104 
    105   return value;
    106 }
    107