File indexing completed on 2025-01-26 04:47:04

 // mk4io.h --
 // This is part of Metakit, the homepage is http://www.equi4.com/metakit/
 
 /** @file
  * Declaration of the file stream and strategy classes.
  */
 
 #pragma once
 
 #include <cstdio>
 
 /////////////////////////////////////////////////////////////////////////////
 /// A file stream can be used to serialize using the stdio library.
 
 class c4_FileStream : public c4_Stream
 {
 public:
     c4_FileStream(FILE *stream_, bool owned_ = false);
     ~c4_FileStream() override;
 
     int Read(void *buffer_, int length_) override;
     bool Write(const void *buffer_, int length_) override;
 
     FILE *_stream;
     bool _owned;
 };
 
 /////////////////////////////////////////////////////////////////////////////
 /// A file strategy encapsulates code dealing with all file I/O.
 
 class c4_FileStrategy : public c4_Strategy
 {
 public:
     /// Construct a new strategy object
     c4_FileStrategy(FILE *file_ = nullptr);
     ~c4_FileStrategy() override;
 
     /// True if we can do I/O with this object
     bool IsValid() const override;
     /// Open a data file by name
     virtual bool DataOpen(const char *fileName_, int mode_);
     /// Read a number of bytes
     int  DataRead(t4_i32 pos_, void *buffer_, int length_) override;
     /// Write a number of bytes, return true if successful
     void DataWrite(t4_i32 pos_, const void *buffer_, int length_) override;
     /// Flush and truncate file
     void DataCommit(t4_i32 newSize_) override;
     /// Support for memory-mapped files
     void ResetFileMapping() override;
     /// Report total size of the datafile
     t4_i32 FileSize() override;
     /// Return a good value to use as fresh generation counter
     t4_i32 FreshGeneration() override;
 
 protected:
     /// Pointer to file object
     FILE *_file;
     /// Pointer to same file object, if it must be deleted at end
     FILE *_cleanup;
 };
 
 /////////////////////////////////////////////////////////////////////////////