vhd 转换为img源码，由VS 2010 C++编译

本工程主要由vhd2img.cpp layout.h组成,C代码实现。

vhd2img.cpp：

// vhd2img.cpp : 定义控制台应用程序的入口点。
//by www.frombyte.cn zhangyu
//北亚数据恢复中心(www.sjhf.net)张宇 2012/1/6 发表于51cto   

#include "stdafx.h"
#include <windows.h>
#include "layout.h"
#define VHD_OPENED 1
#define VHD_UNOPEN 0
#define BIT_MASK 0x80
static inline int test_bit (byte *addr, u32 nr)
{
    return ((addr[nr >> 3] << (nr & 7)) & BIT_MASK) != 0;
};
static inline void set_bit (byte *addr, u32 nr)
{
    addr[nr >> 3] |= (BIT_MASK >> (nr & 7));
}    

HANDLE hIn,hOut;    

struct vhd_info
{
    u64 uSize;
    u32 *bat;
    byte *batmap;
    u64 uBlkSize;
    u64 uBatNum;
    u32 spb; //secters per block
    u32 log2spb;
    u32 vhd_status;
    bool is_have_batmap;
};    

int open_vhd(TCHAR *name,vhd_info &vhd)
{
    hd_ftr vhd_head;
    hIn = CreateFile(name,GENERIC_READ,FILE_SHARE_READ,NULL,OPEN_EXISTING,0,NULL);
    if(hIn == INVALID_HANDLE_VALUE)
    {
        _tprintf(_T("ERROR%d:source VHD file open error!\n"),GetLastError());
        return -1;
    }
    DWORD bRead;
    ReadFile(hIn,(char*)&vhd_head,sizeof(hd_ftr),&bRead,NULL);
    if(bRead != sizeof(hd_ftr))
        return -2;
    if(strncmp(vhd_head.cookie,HD_COOKIE,8) != 0)
    {
        _tprintf(_T("the source file is not a valid VHD format!\n"));
        return -3;
    }
    if( (LE32(vhd_head.type) != HD_TYPE_DYNAMIC) && (LE32(vhd_head.type) != HD_TYPE_DIFF) )
        return -4;    

    dd_hdr vhd_sparce;
    ReadFile(hIn,(char*)&vhd_sparce,sizeof(dd_hdr),&bRead,NULL);
    if(bRead != sizeof(dd_hdr))
        return -5;
    if(strncmp(vhd_sparce.cookie,DD_COOKIE,8) != 0)
        return -6;
    vhd.uBlkSize = LE32(vhd_sparce.block_size);
    vhd.uBatNum = LE32(vhd_sparce.max_bat_size);
    vhd.bat = new u32 [vhd.uBatNum];
    LARGE_INTEGER liPoi,liNew;
    liPoi.QuadPart = LE64(vhd_sparce.table_offset);
    SetFilePointerEx(hIn,liPoi,&liNew,FILE_BEGIN);
    ReadFile(hIn,vhd.bat,vhd.uBatNum * sizeof(u32),&bRead,NULL);
    if(bRead != vhd.uBatNum * sizeof(u32))
        return -7;    

    dd_batmap_hdr batmap_head;
    ReadFile(hIn,(char*)&batmap_head,sizeof(dd_batmap_hdr),&bRead,NULL);
    if(bRead != sizeof(dd_batmap_hdr))
        return -8;
    if(strncmp(batmap_head.cookie,VHD_BATMAP_COOKIE,8) != 0)
        vhd.is_have_batmap = FALSE;
    else
        vhd.is_have_batmap = TRUE;    

    vhd.spb = vhd.uBlkSize >> VHD_SECTOR_SHIFT;
    vhd.vhd_status = VHD_OPENED;
    return 1;
}
int read_vhd(vhd_info &vhd,byte* buf,u32 blkno)
{
    byte spb_bitmap[VHD_SECTOR_SIZE];
    DWORD bRead;
    if(vhd.bat[blkno] == 0xFFFFFFFF)
        return 2;
    byte *tbuf = new byte [vhd.uBlkSize];
    LARGE_INTEGER liPoi,liNew;
    liPoi.QuadPart = (u64)(LE32(vhd.bat[blkno])) << VHD_SECTOR_SHIFT;
    SetFilePointerEx(hIn,liPoi,&liNew,FILE_BEGIN);
    ReadFile(hIn,spb_bitmap,VHD_SECTOR_SIZE,&bRead,NULL);
    if(bRead != VHD_SECTOR_SIZE)
    {
        delete [] tbuf;
        return -2;
    }
    ReadFile(hIn,tbuf,vhd.uBlkSize,&bRead,NULL);
    if(bRead != vhd.uBlkSize)
    {
        delete [] tbuf;
        return -3;
    }
    for(u32 i=0;i<vhd.spb;i++)
    {
        if(test_bit(spb_bitmap,i)) //位为1，表示磁盘上有数据，需要拷贝
        {
            memcpy(buf + i * VHD_SECTOR_SIZE,tbuf + i*VHD_SECTOR_SIZE,VHD_SECTOR_SIZE);
        }
    }
    delete [] tbuf;
    return 1;
}    

int _tmain(int argc, _TCHAR* argv[])
{
    if(argc != 3)
    {
        _tprintf(_T("vhd2img.exe <input vhd name> <output file/disk name>\n"));
        _tprintf(_T("eg. vhd2img.exe my.vhd d:\\my.img \n"));
        _tprintf(_T("    vhd2img.exe my.vhd \"\\\\.\\physicaldrive1\" (write to hardisk 1)\n"));
        return 0;
    }    

    vhd_info vhd;    

    //打开输入vhd
    if(open_vhd(argv[1],vhd) != 1)
        return -1;    

    //生成目标文件
    HANDLE hOut = CreateFile(argv[2],GENERIC_READ|GENERIC_WRITE,FILE_SHARE_READ|FILE_SHARE_WRITE,NULL,OPEN_EXISTING,0,NULL);
    if(hOut == INVALID_HANDLE_VALUE)
    {
        hOut = CreateFile(argv[2],GENERIC_READ|GENERIC_WRITE,FILE_SHARE_READ|FILE_SHARE_WRITE,NULL,OPEN_ALWAYS,0,NULL);
        if(hOut == INVALID_HANDLE_VALUE)
        {
            _tprintf(_T("ERROR%d:the dest disk/file open error!\n"),GetLastError());
            return -1;
        }
    }
    //u32 nBlkSize = vhd.uBlkSize;
    byte* buf = new byte [vhd.uBlkSize];
    u32 nBitmapSize = (vhd.spb >> 3 );
    byte* bitmap = new byte [nBitmapSize];
    DWORD bWrite;
    LARGE_INTEGER liPos,liNew;    

    for(int i=0;i<vhd.uBatNum;i++)
    {
        memset(buf,0,vhd.uBlkSize);
        memset(bitmap,0,nBitmapSize);
        if(read_vhd(vhd,buf,i) != 1) //读错误或属于稀疏空间
            continue;
        liPos.QuadPart = (u64)i * (u64)vhd.uBlkSize;
        SetFilePointerEx(hOut,liPos,&liNew,FILE_BEGIN);
        WriteFile(hOut,buf,vhd.uBlkSize,&bWrite,NULL);
        if(bWrite != vhd.uBlkSize)
        {
            _tprintf(_T("ERROR%d:#%dblk (2MB) write error!\n\n"),GetLastError(),i);
            return -1;
        }
    }    

    liPos.QuadPart = (u64)vhd.uBatNum * (u64)vhd.uBlkSize;
    SetFilePointerEx(hOut,liPos,&liNew,FILE_BEGIN);
    SetEndOfFile(hOut);    

    //释放
    delete [] buf;
    delete [] bitmap;
    CloseHandle(hIn);
    CloseHandle(hOut);    

    return 1;    

}

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