shell/FileInputStream.h

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   4  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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  39
  40 #ifndef __avmshell_FileInputStream__
  41 #define __avmshell_FileInputStream__
  42
  43
  44 namespace avmshell
  45 {
  46     class File;
  47
  48     /**
  49      * InputStream is an abstract base class for input streams.
  50      * Concrete subclasses must implement the available and read
  51      * methods to do appropriate read operations.
  52      */
  53     class InputStream
  54     {
  55     public:
  56         virtual ~InputStream() {}
  57         virtual int64_t available() = 0;
  58         virtual size_t read(void *buffer, size_t count) = 0;
  59     };
  60
  61     /**
  62      * FileInputStream is a concrete subclass of InputStream
  63      * that implements file input.
  64      */
  65     class FileInputStream : public InputStream
  66     {
  67     public:
  68         FileInputStream(const char *filename);
  69
  70         bool valid() const;
  71         ~FileInputStream();
  72         int64_t available();
  73         int64_t length() const { return len; }
  74         void seek(int64_t offset);
  75         size_t read(void *buffer, size_t count);
  76
  77     private:
  78         File *file;
  79         int64_t len;
  80     };
  81 }
  82
  83 #endif /* __avmshell_FileInputStream__ */