files.h

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// files.h - originally written and placed in the public domain by Wei Dai
 
 
#ifndef CRYPTOPP_FILES_H
#define CRYPTOPP_FILES_H
 
#include "cryptlib.h"
#include "filters.h"
#include "argnames.h"
#include "smartptr.h"
 
#include <iostream>
#include <fstream>
 
NAMESPACE_BEGIN(CryptoPP)
 
 
class CRYPTOPP_DLL FileStore : public Store, private FilterPutSpaceHelper, public NotCopyable
{
public:
        class Err : public Exception
        {
        public:
                Err(const std::string &s) : Exception(IO_ERROR, s) {}
        };
        class OpenErr : public Err {public: OpenErr(const std::string &filename) : Err("FileStore: error opening file for reading: " + filename) {}};
        class ReadErr : public Err {public: ReadErr() : Err("FileStore: error reading file") {}};
 
        FileStore() : m_stream(NULLPTR), m_space(NULLPTR), m_len(0), m_waiting(0) {}
 
        FileStore(std::istream &in) : m_stream(NULLPTR), m_space(NULLPTR), m_len(0), m_waiting(0)
                {StoreInitialize(MakeParameters(Name::InputStreamPointer(), &in));}
 
        FileStore(const char *filename) : m_stream(NULLPTR), m_space(NULLPTR), m_len(0), m_waiting(0)
                {StoreInitialize(MakeParameters(Name::InputFileName(), filename ? filename : ""));}
 
#if defined(CRYPTOPP_UNIX_AVAILABLE) || defined(CRYPTOPP_DOXYGEN_PROCESSING) || _MSC_VER >= 1400
        FileStore(const wchar_t *filename)
                {StoreInitialize(MakeParameters(Name::InputFileNameWide(), filename));}
#endif
 
        std::istream* GetStream() {return m_stream;}
 
        const std::istream* GetStream() const {return m_stream;}
 
        lword MaxRetrievable() const;
        size_t TransferTo2(BufferedTransformation &target, lword &transferBytes, const std::string &channel=DEFAULT_CHANNEL, bool blocking=true);
        size_t CopyRangeTo2(BufferedTransformation &target, lword &begin, lword end=LWORD_MAX, const std::string &channel=DEFAULT_CHANNEL, bool blocking=true) const;
        lword Skip(lword skipMax=ULONG_MAX);
 
private:
        void StoreInitialize(const NameValuePairs &parameters);
 
        member_ptr<std::ifstream> m_file;
        std::istream *m_stream;
        byte *m_space;
        size_t m_len;
        bool m_waiting;
};
 
class CRYPTOPP_DLL FileSource : public SourceTemplate<FileStore>
{
public:
        typedef FileStore::Err Err;
        typedef FileStore::OpenErr OpenErr;
        typedef FileStore::ReadErr ReadErr;
 
        FileSource(BufferedTransformation *attachment = NULLPTR)
                : SourceTemplate<FileStore>(attachment) {}
 
        FileSource(std::istream &in, bool pumpAll, BufferedTransformation *attachment = NULLPTR)
                : SourceTemplate<FileStore>(attachment) {SourceInitialize(pumpAll, MakeParameters(Name::InputStreamPointer(), &in));}
 
        FileSource(const char *filename, bool pumpAll, BufferedTransformation *attachment = NULLPTR, bool binary=true)
                : SourceTemplate<FileStore>(attachment) {SourceInitialize(pumpAll, MakeParameters(Name::InputFileName(), filename)(Name::InputBinaryMode(), binary));}
 
#if defined(CRYPTOPP_UNIX_AVAILABLE) || defined(CRYPTOPP_DOXYGEN_PROCESSING) || _MSC_VER >= 1400
        FileSource(const wchar_t *filename, bool pumpAll, BufferedTransformation *attachment = NULLPTR, bool binary=true)
                : SourceTemplate<FileStore>(attachment) {SourceInitialize(pumpAll, MakeParameters(Name::InputFileNameWide(), filename)(Name::InputBinaryMode(), binary));}
#endif
 
        std::istream* GetStream() {return m_store.GetStream();}
};
 
class CRYPTOPP_DLL FileSink : public Sink, public NotCopyable
{
public:
        class Err : public Exception
        {
        public:
                Err(const std::string &s) : Exception(IO_ERROR, s) {}
        };
        class OpenErr : public Err {public: OpenErr(const std::string &filename) : Err("FileSink: error opening file for writing: " + filename) {}};
        class WriteErr : public Err {public: WriteErr() : Err("FileSink: error writing file") {}};
 
        FileSink() : m_stream(NULLPTR) {}
 
        FileSink(std::ostream &out)
                {IsolatedInitialize(MakeParameters(Name::OutputStreamPointer(), &out));}
 
        FileSink(const char *filename, bool binary=true)
                {IsolatedInitialize(MakeParameters(Name::OutputFileName(), filename)(Name::OutputBinaryMode(), binary));}
 
#if defined(CRYPTOPP_UNIX_AVAILABLE) || _MSC_VER >= 1400
        FileSink(const wchar_t *filename, bool binary=true)
                {IsolatedInitialize(MakeParameters(Name::OutputFileNameWide(), filename)(Name::OutputBinaryMode(), binary));}
#endif
 
        std::ostream* GetStream() {return m_stream;}
 
        void IsolatedInitialize(const NameValuePairs &parameters);
        size_t Put2(const byte *inString, size_t length, int messageEnd, bool blocking);
        bool IsolatedFlush(bool hardFlush, bool blocking);
 
private:
        member_ptr<std::ofstream> m_file;
        std::ostream *m_stream;
};
 
NAMESPACE_END
 
#endif