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#pragma once
#include <Exceptions.h>
namespace Balau {
class EAgain : public GeneralException {
public:
EAgain() : GeneralException("Try Again") { }
};
class ENoEnt : public GeneralException {
public:
ENoEnt(const char * name) : GeneralException(String("No such file or directory: `") + name + "'") { }
};
class IO;
class Handle {
public:
virtual ~Handle() { Assert(m_refCount == 0); }
virtual void close() throw (GeneralException) = 0;
virtual bool isClosed() = 0;
virtual bool isEOF() = 0;
virtual bool canSeek();
virtual bool canRead();
virtual bool canWrite();
virtual const char * getName() = 0;
virtual ssize_t read(void * buf, size_t count) throw (GeneralException);
virtual ssize_t write(const void * buf, size_t count) throw (GeneralException);
virtual void rseek(off_t offset, int whence = SEEK_SET) throw (GeneralException);
virtual void wseek(off_t offset, int whence = SEEK_SET) throw (GeneralException);
virtual off_t rtell() throw (GeneralException);
virtual off_t wtell() throw (GeneralException);
virtual off_t getSize();
virtual time_t getMTime();
protected:
Handle() : m_refCount(0) { }
private:
void addRef() { m_refCount++; }
void delRef() { if (--m_refCount == 0) { if (!isClosed()) close(); delete this; } }
int refCount() { return m_refCount; }
friend class IO;
int m_refCount;
};
class IO {
public:
template<class T> IO(T * h) { setHandle(h); }
~IO() { m_h->delRef(); }
IO(const IO & io) { setHandle(io.m_h); }
Handle * operator->() { return m_h; }
protected:
void setHandle(Handle * h) { m_h = h; m_h->addRef(); }
private:
Handle * m_h;
};
class SeekableHandle : public Handle {
public:
SeekableHandle() : m_wOffset(0), m_rOffset(0) { }
virtual bool canSeek();
virtual void rseek(off_t offset, int whence = SEEK_SET) throw (GeneralException);
virtual void wseek(off_t offset, int whence = SEEK_SET) throw (GeneralException);
virtual off_t rtell() throw (GeneralException);
virtual off_t wtell() throw (GeneralException);
virtual bool isEOF();
protected:
off_t getWOffset() { return m_wOffset; }
off_t getROffset() { return m_rOffset; }
private:
off_t m_wOffset, m_rOffset;
};
};
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