Since .apk is just a fancy .zip archive, we use the ZLib library by Jean-loup Gailly combined with the MiniZIP library to retrieve compressed files from it. The complete source code is about 500 kilobytes in size so we provide two files, libcompress.c and libcompress.h, which are easily integrated into any build process. Our goal is to implement the clArchiveMountPoint which enumerates files in an archive, decompresses the data for the specific file, and creates a clMemFileMapper to read its data. To do this, we need to introduce a helper class, clArchiveReader, which reads and decompresses .zip archives:
class clArchiveReader: public iIntrusiveCounter
{
private:The private sFileInfo structure is defined in the clArchiveReader class and encapsulates a pack of useful file properties together with the pointer to compressed file data:
struct sFileInfo
{
/// offset to the file
uint64 FOffset;
/// uncompressed file size
uint64 FSize;
/// compressed...