root/shell/FileInputStream.h

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 * The Original Code is [Open Source Virtual Machine.].
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 * The Initial Developer of the Original Code is
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#ifndef __avmshell_FileInputStream__
#define __avmshell_FileInputStream__


namespace avmshell
{
        class File;

        /**
         * InputStream is an abstract base class for input streams.
         * Concrete subclasses must implement the available and read
         * methods to do appropriate read operations.
         */
        class InputStream
        {
        public:
                virtual ~InputStream() {}
                virtual int64_t available() = 0;
                virtual size_t read(void *buffer, size_t count) = 0;
        };

        /**
         * FileInputStream is a concrete subclass of InputStream
         * that implements file input.
         */
        class FileInputStream : public InputStream
        {
        public:
                FileInputStream(const char *filename);

                bool valid() const;
                ~FileInputStream();
                int64_t available();
                int64_t length() const { return len; }
                void seek(int64_t offset);
                size_t read(void *buffer, size_t count);

        private:
                File *file;
                int64_t len;
        };
}

#endif /* __avmshell_FileInputStream__ */