The following implementation of the iRawFile interface encapsulates access to untyped memory blocks as file access. We will use this class to access uncompressed data in archives.
class clMemRawFile: public iRawFile
{
public:The parameterized constructor initializes the pointer to a data buffer and its size:
clMemRawFile( const uint8_t* BufPtr, size_t BufSize, bool OwnsBuffer )
: FOwnsBuffer( OwnsBuffer )
, FBuffer( BufPtr )
, FBufferSize( BufSize )
{}The memory mapping is trivial for a memory block, we just return the stored raw pointer:
virtual const uint8_t* GetFileData() const override
{ return FBuffer; }
virtual uint64_t GetFileSize() const override
{ return FBufferSize; }
private:
const uint8_t* FBuffer;
size_t FBufferSize;
};We will return to this class once we deal with archive file reading. Now, let's get familiar with one more important concept required to access .apk packages transparently.