strarc/bfcopy.cpp at master · LTRData/strarc · GitHub

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/* Stream Archive I/O utility, Copyright (C) Olof Lagerkvist 2004-2022
*
* bfcopy.cpp
* Backup based copy file feature.
*/

#ifndef _UNICODE
#define _UNICODE
#endif
#ifndef _DLL
#define _DLL
#endif
#ifndef UNICODE
#define UNICODE
#endif
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif

#define WIN32_NO_STATUS
#include <process.h>
#include <windows.h>
#include <intsafe.h>

#undef WIN32_NO_STATUS
#include <ntdll.h>
#include <winstrct.h>
#include <wio.h>

#include "strarc.hpp"

class StrArc::FileCopyContext
{
    StrArc *SourceReadSession;
    StrArc *TargetWriteSession;

    PUNICODE_STRING SourceName;
    HANDLE SourceHandle;

    HANDLE SourceReadThreadHandle;

    PUNICODE_STRING TargetName;
    HANDLE TargetHandle;

    static
        unsigned
        CALLBACK
        SourceReadThread(void *lpCtx)
    {
        FileCopyContext *Context = (FileCopyContext *)lpCtx;

        DWORD dwResult = NO_ERROR;
        if (!Context->SourceReadSession->
            ReadFileStreamsToArchive(Context->SourceName,
                Context->SourceHandle))
            dwResult = GetLastError();

        delete Context->SourceReadSession;
        Context->SourceReadSession = NULL;

        return dwResult;
    }

public:

    StrArc *GetSourceReadSession()
    {
        return SourceReadSession;
    }

    StrArc *GetTargetWriteSession()
    {
        return TargetWriteSession;
    }

    bool
        GetSourceReadThreadResult(DWORD dwMilliseconds = INFINITE)
    {
        WaitForSingleObject(SourceReadThreadHandle, dwMilliseconds);

        DWORD dwExitCode;
        if (!GetExitCodeThread(SourceReadThreadHandle, &dwExitCode))
            dwExitCode = GetLastError();

        CloseHandle(SourceReadThreadHandle);

        if (dwExitCode == NO_ERROR)
            return true;

        SetLastError(dwExitCode);
        return false;
    }

    bool
        StartSourceReadThread()
    {
        unsigned uiThreadId;

        SourceReadThreadHandle = (HANDLE)
            _beginthreadex(NULL, 0, SourceReadThread, this, 0, &uiThreadId);

        return SourceReadThreadHandle != INVALID_HANDLE_VALUE;
    }

    bool operator!()
    {
        if ((SourceReadSession == NULL) |
            (TargetWriteSession == NULL))
            return true;
        else
            return false;
    }

    FileCopyContext(StrArc *Template,
        DWORD dwPipeBufferSize,
        PUNICODE_STRING SourceName,
        HANDLE SourceHandle,
        PUNICODE_STRING TargetName,
        HANDLE TargetHandle)
        : SourceReadSession(NULL),
        TargetWriteSession(NULL),
        SourceName(SourceName),
        SourceHandle(SourceHandle),
        TargetName(TargetName),
        TargetHandle(TargetHandle),
        SourceReadThreadHandle(INVALID_HANDLE_VALUE)
    {
        HANDLE hReadPipe;
        HANDLE hWritePipe;
        if (!CreatePipe(&hReadPipe, &hWritePipe, NULL, dwPipeBufferSize))
            return;

        SourceReadSession = Template->TemplateNew(hWritePipe);
        TargetWriteSession = Template->TemplateNew(hReadPipe);
    }

    ~FileCopyContext()
    {
        if (SourceReadSession != NULL)
            delete SourceReadSession;

        if (TargetWriteSession != NULL)
            delete TargetWriteSession;
    }
};

bool
StrArc::BackupCopyFile(HANDLE SourceHandle,
    HANDLE TargetHandle,
    PUNICODE_STRING SourceName,
    PUNICODE_STRING TargetName)
{
    FileCopyContext Context(this,
        dwBufferSize,
        SourceName,
        SourceHandle,
        TargetName,
        TargetHandle);

    if (!Context)
        return false;

    bool bSeekOnly = false;

    if (!Context.StartSourceReadThread())
        return false;

    bool bWriteResult = Context.GetTargetWriteSession()->
        WriteFileFromArchive(TargetName,
            TargetHandle,
            bSeekOnly);

    bool bReadResult =
        Context.GetSourceReadThreadResult();

    return bReadResult & bWriteResult;
}