files.h

00001 #ifndef CRYPTOPP_FILES_H
00002 #define CRYPTOPP_FILES_H
00003 
00004 #include "cryptlib.h"
00005 #include "filters.h"
00006 #include "argnames.h"
00007 
00008 #include <iostream>
00009 #include <fstream>
00010 
00011 NAMESPACE_BEGIN(CryptoPP)
00012 
00013 //! file-based implementation of Store interface
00014 class CRYPTOPP_DLL FileStore : public Store, private FilterPutSpaceHelper, public NotCopyable
00015 {
00016 public:
00017     class Err : public Exception
00018     {
00019     public:
00020         Err(const std::string &s) : Exception(IO_ERROR, s) {}
00021     };
00022     class OpenErr : public Err {public: OpenErr(const std::string &filename) : Err("FileStore: error opening file for reading: " + filename) {}};
00023     class ReadErr : public Err {public: ReadErr() : Err("FileStore: error reading file") {}};
00024 
00025     FileStore() : m_stream(NULL) {}
00026     FileStore(std::istream &in)
00027         {StoreInitialize(MakeParameters(Name::InputStreamPointer(), &in));}
00028     FileStore(const char *filename)
00029         {StoreInitialize(MakeParameters(Name::InputFileName(), filename));}
00030 
00031     std::istream* GetStream() {return m_stream;}
00032 
00033     lword MaxRetrievable() const;
00034     size_t TransferTo2(BufferedTransformation &target, lword &transferBytes, const std::string &channel=NULL_CHANNEL, bool blocking=true);
00035     size_t CopyRangeTo2(BufferedTransformation &target, lword &begin, lword end=LWORD_MAX, const std::string &channel=NULL_CHANNEL, bool blocking=true) const;
00036     lword Skip(lword skipMax=ULONG_MAX);
00037 
00038 private:
00039     void StoreInitialize(const NameValuePairs &parameters);
00040     
00041     member_ptr<std::ifstream> m_file;
00042     std::istream *m_stream;
00043     byte *m_space;
00044     size_t m_len;
00045     bool m_waiting;
00046 };
00047 
00048 //! file-based implementation of Source interface
00049 class CRYPTOPP_DLL FileSource : public SourceTemplate<FileStore>
00050 {
00051 public:
00052     typedef FileStore::Err Err;
00053     typedef FileStore::OpenErr OpenErr;
00054     typedef FileStore::ReadErr ReadErr;
00055 
00056     FileSource(BufferedTransformation *attachment = NULL)
00057         : SourceTemplate<FileStore>(attachment) {}
00058     FileSource(std::istream &in, bool pumpAll, BufferedTransformation *attachment = NULL)
00059         : SourceTemplate<FileStore>(attachment) {SourceInitialize(pumpAll, MakeParameters(Name::InputStreamPointer(), &in));}
00060     FileSource(const char *filename, bool pumpAll, BufferedTransformation *attachment = NULL, bool binary=true)
00061         : SourceTemplate<FileStore>(attachment) {SourceInitialize(pumpAll, MakeParameters(Name::InputFileName(), filename)(Name::InputBinaryMode(), binary));}
00062 
00063     std::istream* GetStream() {return m_store.GetStream();}
00064 };
00065 
00066 //! file-based implementation of Sink interface
00067 class CRYPTOPP_DLL FileSink : public Sink, public NotCopyable
00068 {
00069 public:
00070     class Err : public Exception
00071     {
00072     public:
00073         Err(const std::string &s) : Exception(IO_ERROR, s) {}
00074     };
00075     class OpenErr : public Err {public: OpenErr(const std::string &filename) : Err("FileSink: error opening file for writing: " + filename) {}};
00076     class WriteErr : public Err {public: WriteErr() : Err("FileSink: error writing file") {}};
00077 
00078     FileSink() : m_stream(NULL) {}
00079     FileSink(std::ostream &out)
00080         {IsolatedInitialize(MakeParameters(Name::OutputStreamPointer(), &out));}
00081     FileSink(const char *filename, bool binary=true)
00082         {IsolatedInitialize(MakeParameters(Name::OutputFileName(), filename)("OutputBinaryMode", binary));}
00083 
00084     std::ostream* GetStream() {return m_stream;}
00085 
00086     void IsolatedInitialize(const NameValuePairs &parameters);
00087     size_t Put2(const byte *inString, size_t length, int messageEnd, bool blocking);
00088     bool IsolatedFlush(bool hardFlush, bool blocking);
00089 
00090 private:
00091     member_ptr<std::ofstream> m_file;
00092     std::ostream *m_stream;
00093 };
00094 
00095 NAMESPACE_END
00096 
00097 #endif

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