cabinet.c

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/*
 * COPYRIGHT:   See COPYING in the top level directory
 * PROJECT:     ReactOS text-mode setup
 * FILE:        subsys/system/usetup/cabinet.c
 * PURPOSE:     Cabinet routines
 * PROGRAMMERS: Casper S. Hornstrup (chorns@users.sourceforge.net)
 * REVISIONS:
 *   CSH 15/08-2003 Created
 */

#include "usetup.h"

#define NDEBUG
#include <debug.h>

#define SEEK_BEGIN    0
#define SEEK_CURRENT  1
#ifndef SEEK_END
#define SEEK_END      2
#endif

typedef struct _DOSTIME
{
    WORD Second:5;
    WORD Minute:6;
    WORD Hour:5;
} DOSTIME, *PDOSTIME;


typedef struct _DOSDATE
{
    WORD Day:5;
    WORD Month:4;
    WORD Year:5;
} DOSDATE, *PDOSDATE;

static WCHAR CabinetName[256];          // Filename of current cabinet
static WCHAR CabinetPrev[256];          // Filename of previous cabinet
static WCHAR DiskPrev[256];             // Label of cabinet in file CabinetPrev
static WCHAR CabinetNext[256];          // Filename of next cabinet
static WCHAR DiskNext[256];             // Label of cabinet in file CabinetNext
static ULONG FolderUncompSize = 0;      // Uncompressed size of folder
static ULONG BytesLeftInBlock = 0;      // Number of bytes left in current block
static WCHAR DestPath[MAX_PATH];
static HANDLE FileHandle;
static HANDLE FileSectionHandle;
static PUCHAR FileBuffer;
static SIZE_T DestFileSize;
static SIZE_T FileSize;
static BOOL FileOpen = FALSE;
static PCFHEADER PCABHeader;
static PCFFOLDER CabinetFolders;
static ULONG CabinetReserved = 0;
static ULONG FolderReserved = 0;
static ULONG DataReserved = 0;
static ULONG CodecId;
static PCABINET_CODEC_UNCOMPRESS CodecUncompress = NULL;
static BOOL CodecSelected = FALSE;
static ULONG LastFileOffset = 0;    // Uncompressed offset of last extracted file
static PCABINET_OVERWRITE OverwriteHandler = NULL;
static PCABINET_EXTRACT ExtractHandler = NULL;
static PCABINET_DISK_CHANGE DiskChangeHandler = NULL;
static z_stream ZStream;
static PVOID CabinetReservedArea = NULL;


/* Needed by zlib, but we don't want the dependency on msvcrt.dll */
void *__cdecl
malloc(size_t size)
{
    return RtlAllocateHeap(ProcessHeap, HEAP_ZERO_MEMORY, size);
}

void __cdecl
free(void *ptr)
{
    RtlFreeHeap(ProcessHeap, 0, ptr);
}

void *__cdecl
calloc(size_t nmemb, size_t size)
{
    return (void *)RtlAllocateHeap(ProcessHeap, HEAP_ZERO_MEMORY, nmemb * size);
}

/* RAW codec */

/*
 * FUNCTION: Uncompresses data in a buffer
 * ARGUMENTS:
 *     OutputBuffer = Pointer to buffer to place uncompressed data
 *     InputBuffer  = Pointer to buffer with data to be uncompressed
 *     InputLength  = Length of input buffer before, and amount consumed after
 *                    Negative to indicate that this is not the start of a new block
 *     OutputLength = Length of output buffer before, amount filled after
 *                    Negative to indicate that this is not the end of the block
 */
ULONG
RawCodecUncompress(PVOID OutputBuffer,
                   PVOID InputBuffer,
                   PLONG InputLength,
                   PLONG OutputLength)
{
    LONG Len = min(abs(*InputLength), abs(*OutputLength));

    memcpy(OutputBuffer, InputBuffer, Len);
    *InputLength = *OutputLength = Len;

    return CS_SUCCESS;
}

/* MSZIP codec */

/*
 * FUNCTION: Uncompresses data in a buffer
 * ARGUMENTS:
 *     OutputBuffer = Pointer to buffer to place uncompressed data
 *     InputBuffer  = Pointer to buffer with data to be uncompressed
 *     InputLength  = Length of input buffer before, and amount consumed after
 *                    Negative to indicate that this is not the start of a new block
 *     OutputLength = Length of output buffer before, amount filled after
 *                    Negative to indicate that this is not the end of the block
 */
ULONG
MSZipCodecUncompress(PVOID OutputBuffer,
                     PVOID InputBuffer,
                     PLONG InputLength,
                     PLONG OutputLength)
{
    USHORT Magic;
    INT Status;

    DPRINT("MSZipCodecUncompress(OutputBuffer = %x, InputBuffer = %x, "
           "InputLength = %d, OutputLength = %d)\n", OutputBuffer,
           InputBuffer, *InputLength, *OutputLength);
    if (*InputLength > 0)
    {
        Magic = *(PUSHORT)InputBuffer;

        if (Magic != MSZIP_MAGIC)
        {
            DPRINT("Bad MSZIP block header magic (0x%X)\n", Magic);
            return CS_BADSTREAM;
        }

        ZStream.next_in = (PUCHAR)InputBuffer + 2;
        ZStream.avail_in = *InputLength - 2;
        ZStream.next_out = (PUCHAR)OutputBuffer;
        ZStream.avail_out = abs(*OutputLength);

        /* WindowBits is passed < 0 to tell that there is no zlib header.
         * Note that in this case inflate *requires* an extra "dummy" byte
         * after the compressed stream in order to complete decompression and
         * return Z_STREAM_END.
         */
        Status = inflateInit2(&ZStream, -MAX_WBITS);
        if (Status != Z_OK)
        {
            DPRINT("inflateInit2() returned (%d)\n", Status);
            return CS_BADSTREAM;
        }
        ZStream.total_in = 2;
    }
    else
    {
        ZStream.avail_in = -*InputLength;
        ZStream.next_in = (PUCHAR)InputBuffer;
        ZStream.next_out = (PUCHAR)OutputBuffer;
        ZStream.avail_out = abs(*OutputLength);
        ZStream.total_in = 0;
    }

    ZStream.total_out = 0;
    Status = inflate(&ZStream, Z_SYNC_FLUSH);
    if (Status != Z_OK && Status != Z_STREAM_END)
    {
        DPRINT("inflate() returned (%d) (%s)\n", Status, ZStream.msg);
        if (Status == Z_MEM_ERROR)
            return CS_NOMEMORY;
        return CS_BADSTREAM;
    }

    if (*OutputLength > 0)
    {
        Status = inflateEnd(&ZStream);
        if (Status != Z_OK)
        {
            DPRINT("inflateEnd() returned (%d)\n", Status);
            return CS_BADSTREAM;
        }
    }

    *OutputLength = ZStream.total_out;
    *InputLength = ZStream.total_in;

    return CS_SUCCESS;
}

/* Memory functions */

voidpf
MSZipAlloc(voidpf opaque, uInt items, uInt size)
{
    return (voidpf)RtlAllocateHeap(ProcessHeap, 0, items * size);
}

void
MSZipFree(voidpf opaque, voidpf address)
{
    RtlFreeHeap(ProcessHeap, 0, address);
}

static BOOL
ConvertSystemTimeToFileTime(CONST SYSTEMTIME *lpSystemTime,
                            LPFILETIME lpFileTime)
{
    TIME_FIELDS TimeFields;
    LARGE_INTEGER liTime;

    TimeFields.Year = lpSystemTime->wYear;
    TimeFields.Month = lpSystemTime->wMonth;
    TimeFields.Day = lpSystemTime->wDay;
    TimeFields.Hour = lpSystemTime->wHour;
    TimeFields.Minute = lpSystemTime->wMinute;
    TimeFields.Second = lpSystemTime->wSecond;
    TimeFields.Milliseconds = lpSystemTime->wMilliseconds;

    if (RtlTimeFieldsToTime(&TimeFields, &liTime))
    {
        lpFileTime->dwLowDateTime = liTime.u.LowPart;
        lpFileTime->dwHighDateTime = liTime.u.HighPart;
        return TRUE;
    }

    return FALSE;
}

static BOOL
ConvertDosDateTimeToFileTime(WORD wFatDate,
                             WORD wFatTime,
                             LPFILETIME lpFileTime)
{
    PDOSTIME pdtime = (PDOSTIME)&wFatTime;
    PDOSDATE pddate = (PDOSDATE)&wFatDate;
    SYSTEMTIME SystemTime;

    if (lpFileTime == NULL)
        return FALSE;

    SystemTime.wMilliseconds = 0;
    SystemTime.wSecond = pdtime->Second;
    SystemTime.wMinute = pdtime->Minute;
    SystemTime.wHour = pdtime->Hour;

    SystemTime.wDay = pddate->Day;
    SystemTime.wMonth = pddate->Month;
    SystemTime.wYear = 1980 + pddate->Year;

    ConvertSystemTimeToFileTime(&SystemTime, lpFileTime);

    return TRUE;
}

/*
 * FUNCTION: Returns a pointer to file name
 * ARGUMENTS:
 *     Path = Pointer to string with pathname
 * RETURNS:
 *     Pointer to filename
 */
static PWCHAR
GetFileName(PWCHAR Path)
{
    ULONG i, j;

    j = i = 0;

    while (Path[i++])
    {
        if (Path[i - 1] == L'\\')
            j = i;
    }

    return Path + j;
}

/*
 * FUNCTION: Removes a file name from a path
 * ARGUMENTS:
 *     Path = Pointer to string with path
 */
static VOID
RemoveFileName(PWCHAR Path)
{
    PWCHAR FileName;
    DWORD i;

    i = 0;
    FileName = GetFileName(Path + i);

    if (FileName != Path + i && FileName[-1] == L'\\')
        FileName--;

    if (FileName == Path + i && FileName[0] == L'\\')
        FileName++;

    FileName[0] = 0;
}

/*
 * FUNCTION: Sets attributes on a file
 * ARGUMENTS:
 *      File = Pointer to CFFILE node for file
 * RETURNS:
 *     Status of operation
 */
static BOOL
SetAttributesOnFile(PCFFILE File,
                    HANDLE hFile)
{
    FILE_BASIC_INFORMATION FileBasic;
    IO_STATUS_BLOCK IoStatusBlock;
    NTSTATUS NtStatus;
    ULONG Attributes = 0;

    if (File->Attributes & CAB_ATTRIB_READONLY)
        Attributes |= FILE_ATTRIBUTE_READONLY;

    if (File->Attributes & CAB_ATTRIB_HIDDEN)
        Attributes |= FILE_ATTRIBUTE_HIDDEN;

    if (File->Attributes & CAB_ATTRIB_SYSTEM)
        Attributes |= FILE_ATTRIBUTE_SYSTEM;

    if (File->Attributes & CAB_ATTRIB_DIRECTORY)
        Attributes |= FILE_ATTRIBUTE_DIRECTORY;

    if (File->Attributes & CAB_ATTRIB_ARCHIVE)
        Attributes |= FILE_ATTRIBUTE_ARCHIVE;

    NtStatus = NtQueryInformationFile(hFile,
                                      &IoStatusBlock,
                                      &FileBasic,
                                      sizeof(FILE_BASIC_INFORMATION),
                                      FileBasicInformation);
    if (!NT_SUCCESS(NtStatus))
    {
        DPRINT("NtQueryInformationFile() failed (%x)\n", NtStatus);
    }
    else
    {
        FileBasic.FileAttributes = Attributes;

        NtStatus = NtSetInformationFile(hFile,
                                        &IoStatusBlock,
                                        &FileBasic,
                                        sizeof(FILE_BASIC_INFORMATION),
                                        FileBasicInformation);
        if (!NT_SUCCESS(NtStatus))
        {
            DPRINT("NtSetInformationFile() failed (%x)\n", NtStatus);
        }
    }

    return NT_SUCCESS(NtStatus);
}

/*
 * FUNCTION: Closes the current cabinet
 * RETURNS:
 *     Status of operation
 */
static ULONG
CloseCabinet(VOID)
{
    if (FileBuffer)
    {
        NtUnmapViewOfSection(NtCurrentProcess(), FileBuffer);
        NtClose(FileSectionHandle);
        NtClose(FileHandle);
        FileBuffer = NULL;
    }

    return 0;
}

/*
 * FUNCTION: Initialize archiver
 */
VOID
CabinetInitialize(VOID)
{
    ZStream.zalloc = MSZipAlloc;
    ZStream.zfree = MSZipFree;
    ZStream.opaque = (voidpf)0;

    FileOpen = FALSE;
    wcscpy(DestPath, L"");

    CodecId = CAB_CODEC_RAW;
    CodecSelected = TRUE;

    FolderUncompSize = 0;
    BytesLeftInBlock = 0;
    CabinetReserved = 0;
    FolderReserved = 0;
    DataReserved = 0;
    CabinetReservedArea = NULL;
    LastFileOffset = 0;
}

/*
 * FUNCTION: Cleanup archiver
 */
VOID
CabinetCleanup(VOID)
{
    CabinetClose();
}

/*
 * FUNCTION: Normalizes a path
 * ARGUMENTS:
 *     Path   = Pointer to string with pathname
 *     Length = Number of characters in Path
 * RETURNS:
 *     TRUE if there was enough room in Path, or FALSE
 */
BOOL
CabinetNormalizePath(PWCHAR Path,
                     ULONG Length)
{
    ULONG n;
    BOOL Ok;

    n = wcslen(Path);
    Ok = (n + 1) < Length;

    if (n != 0 && Path[n - 1] != L'\\' && Ok)
    {
        Path[n] = L'\\';
        Path[n + 1] = 0;
    }

    return Ok;
}

/*
 * FUNCTION: Returns pointer to cabinet file name
 * RETURNS:
 *     Pointer to string with name of cabinet
 */
PWCHAR
CabinetGetCabinetName(VOID)
{
    return CabinetName;
}

/*
 * FUNCTION: Sets cabinet file name
 * ARGUMENTS:
 *     FileName = Pointer to string with name of cabinet
 */
VOID
CabinetSetCabinetName(PWCHAR FileName)
{
    wcscpy(CabinetName, FileName);
}

/*
 * FUNCTION: Sets destination path
 * ARGUMENTS:
 *    DestinationPath = Pointer to string with name of destination path
 */
VOID
CabinetSetDestinationPath(PWCHAR DestinationPath)
{
    wcscpy(DestPath, DestinationPath);

    if (wcslen(DestPath) > 0)
        CabinetNormalizePath(DestPath, MAX_PATH);
}

/*
 * FUNCTION: Returns destination path
 * RETURNS:
 *    Pointer to string with name of destination path
 */
PWCHAR
CabinetGetDestinationPath(VOID)
{
    return DestPath;
}

/*
 * FUNCTION: Opens a cabinet file
 * RETURNS:
 *     Status of operation
 */
ULONG
CabinetOpen(VOID)
{
    PUCHAR Buffer;
    UNICODE_STRING ustring;
    ANSI_STRING astring;

    if (!FileOpen)
    {
        OBJECT_ATTRIBUTES ObjectAttributes;
        IO_STATUS_BLOCK IoStatusBlock;
        UNICODE_STRING FileName;
        NTSTATUS NtStatus;

        RtlInitUnicodeString(&FileName, CabinetName);

        InitializeObjectAttributes(&ObjectAttributes,
                                   &FileName,
                                   OBJ_CASE_INSENSITIVE,
                                   NULL, NULL);

        NtStatus = NtOpenFile(&FileHandle,
                              GENERIC_READ | SYNCHRONIZE,
                              &ObjectAttributes,
                              &IoStatusBlock,
                              FILE_SHARE_READ,
                              FILE_SYNCHRONOUS_IO_NONALERT);

        if (!NT_SUCCESS(NtStatus))
        {
            DPRINT("Cannot open file (%S) (%x)\n", CabinetName, NtStatus);
            return CAB_STATUS_CANNOT_OPEN;
        }

        FileOpen = TRUE;

        NtStatus = NtCreateSection(&FileSectionHandle,
                                   SECTION_ALL_ACCESS,
                                   0, 0,
                                   PAGE_READONLY,
                                   SEC_COMMIT,
                                   FileHandle);

        if (!NT_SUCCESS(NtStatus))
        {
            DPRINT("NtCreateSection failed: %x\n", NtStatus);
            return CAB_STATUS_NOMEMORY;
        }

        FileBuffer = 0;
        FileSize = 0;

        NtStatus = NtMapViewOfSection(FileSectionHandle,
                                      NtCurrentProcess(),
                                      (PVOID *)&FileBuffer,
                                      0, 0, 0,
                                      &FileSize,
                                      ViewUnmap,
                                      0,
                                      PAGE_READONLY);

        if (!NT_SUCCESS(NtStatus))
        {
            DPRINT("NtMapViewOfSection failed: %x\n", NtStatus);
            return CAB_STATUS_NOMEMORY;
        }

        DPRINT("Cabinet file %S opened and mapped to %x\n", CabinetName, FileBuffer);
        PCABHeader = (PCFHEADER) FileBuffer;

        /* Check header */
        if (FileSize <= sizeof(CFHEADER) ||
            PCABHeader->Signature != CAB_SIGNATURE ||
            PCABHeader->Version != CAB_VERSION ||
            PCABHeader->FolderCount == 0 ||
            PCABHeader->FileCount == 0 ||
            PCABHeader->FileTableOffset < sizeof(CFHEADER))
        {
            CloseCabinet();
            DPRINT("File has invalid header\n");
            return CAB_STATUS_INVALID_CAB;
        }

        Buffer = (PUCHAR)(PCABHeader + 1);

        /* Read/skip any reserved bytes */
        if (PCABHeader->Flags & CAB_FLAG_RESERVE)
        {
            CabinetReserved = *(PUSHORT)Buffer;
            Buffer += 2;
            FolderReserved = *Buffer;
            Buffer++;
            DataReserved = *Buffer;
            Buffer++;

            if (CabinetReserved > 0)
            {
                CabinetReservedArea = Buffer;
                Buffer += CabinetReserved;
            }
        }

        if (PCABHeader->Flags & CAB_FLAG_HASPREV)
        {
            /* The previous cabinet file is in
               the same directory as the current */
            wcscpy(CabinetPrev, CabinetName);
            RemoveFileName(CabinetPrev);
            CabinetNormalizePath(CabinetPrev, 256);
            RtlInitAnsiString(&astring, (LPSTR)Buffer);
            ustring.Length = wcslen(CabinetPrev);
            ustring.Buffer = CabinetPrev + ustring.Length;
            ustring.MaximumLength = sizeof(CabinetPrev) - ustring.Length;
            RtlAnsiStringToUnicodeString(&ustring, &astring, FALSE);
            Buffer += astring.Length + 1;

            /* Read label of prev disk */
            RtlInitAnsiString(&astring, (LPSTR)Buffer);
            ustring.Length = 0;
            ustring.Buffer = DiskPrev;
            ustring.MaximumLength = sizeof(DiskPrev);
            RtlAnsiStringToUnicodeString(&ustring, &astring, FALSE);
            Buffer += astring.Length + 1;
        }
        else
        {
            wcscpy(CabinetPrev, L"");
            wcscpy(DiskPrev, L"");
        }

        if (PCABHeader->Flags & CAB_FLAG_HASNEXT)
        {
            /* The next cabinet file is in
               the same directory as the previous */
            wcscpy(CabinetNext, CabinetName);
            RemoveFileName(CabinetNext);
            CabinetNormalizePath(CabinetNext, 256);
            RtlInitAnsiString(&astring, (LPSTR)Buffer);
            ustring.Length = wcslen(CabinetNext);
            ustring.Buffer = CabinetNext + ustring.Length;
            ustring.MaximumLength = sizeof(CabinetNext) - ustring.Length;
            RtlAnsiStringToUnicodeString(&ustring, &astring, FALSE);
            Buffer += astring.Length + 1;

            /* Read label of next disk */
            RtlInitAnsiString(&astring, (LPSTR)Buffer);
            ustring.Length = 0;
            ustring.Buffer = DiskNext;
            ustring.MaximumLength = sizeof(DiskNext);
            RtlAnsiStringToUnicodeString(&ustring, &astring, FALSE);
            Buffer += astring.Length + 1;
        }
        else
        {
            wcscpy(CabinetNext, L"");
            wcscpy(DiskNext, L"");
        }
        CabinetFolders = (PCFFOLDER)Buffer;
    }

    DPRINT("CabinetOpen returning SUCCESS\n");
    return CAB_STATUS_SUCCESS;
}

/*
 * FUNCTION: Closes the cabinet file
 */
VOID
CabinetClose(VOID)
{
    if (FileOpen)
    {
        CloseCabinet();
        FileOpen = FALSE;
    }
}

/*
 * FUNCTION: Finds the first file in the cabinet that matches a search criteria
 * ARGUMENTS:
 *     FileName = Pointer to search criteria
 *     Search   = Pointer to search structure
 * RETURNS:
 *     Status of operation
 */
ULONG
CabinetFindFirst(PWCHAR FileName,
                 PCAB_SEARCH Search)
{
    DPRINT("CabinetFindFirst( FileName = %S )\n", FileName);
    wcsncpy(Search->Search, FileName, MAX_PATH);
    wcsncpy(Search->Cabinet, CabinetName, MAX_PATH);
    Search->File = 0;
    return CabinetFindNext(Search);
}

/*
 * FUNCTION: Finds the next file in the cabinet that matches a search criteria
 * ARGUMENTS:
 *     FileName = Pointer to search criteria
 *     Search   = Pointer to search structure
 * RETURNS:
 *     Status of operation
 */
ULONG
CabinetFindNextFileSequential(PWCHAR FileName,
                              PCAB_SEARCH Search)
{
    DPRINT("CabinetFindNextFileSequential( FileName = %S )\n", FileName);
    wcsncpy(Search->Search, FileName, MAX_PATH);
    return CabinetFindNext(Search);
}

/*
 * FUNCTION: Finds next file in the cabinet that matches a search criteria
 * ARGUMENTS:
 *     Search = Pointer to search structure
 * RETURNS:
 *     Status of operation
 */
ULONG
CabinetFindNext(PCAB_SEARCH Search)
{
    PCFFILE Prev;
    ANSI_STRING AnsiString;
    UNICODE_STRING UnicodeString;
    WCHAR FileName[MAX_PATH];

    if (wcscmp(Search->Cabinet, CabinetName) != 0)
    {
        /* restart search of cabinet has changed since last find */
        Search->File = 0;
    }

    if (!Search->File)
    {
        /* starting new search or cabinet */
        Search->File = (PCFFILE)(FileBuffer + PCABHeader->FileTableOffset);
        Search->Index = 0;
        Prev = 0;
    }
    else
        Prev = Search->File;

    while (TRUE)
    {
        /* look at each file in the archive and see if we found a match */
        if (Search->File->FolderIndex == 0xFFFD ||
            Search->File->FolderIndex == 0xFFFF)
        {
            /* skip files continued from previous cab */
            DPRINT("Skipping file (%s): FileOffset (0x%X), "
                   "LastFileOffset (0x%X)\n", (char *)(Search->File + 1),
                   Search->File->FileOffset, LastFileOffset);
        }
        else
        {
            // FIXME: check for match against search criteria
            if (Search->File != Prev)
            {
                if (Prev == NULL || Search->File->FolderIndex != Prev->FolderIndex)
                {
                    Search->CFData = NULL;
                    Search->Offset = 0;
                }
                
                /* don't match the file we started with */
                if (wcscmp(Search->Search, L"*") == 0)
                {
                    /* take any file */
                    break;
                }
                else
                {
                    /* otherwise, try to match the exact file name */
                    RtlInitAnsiString(&AnsiString, Search->File->FileName);
                    UnicodeString.Buffer = FileName;
                    UnicodeString.Buffer[0] = 0;
                    UnicodeString.Length = 0;
                    UnicodeString.MaximumLength = sizeof(FileName);
                    RtlAnsiStringToUnicodeString(&UnicodeString, &AnsiString, FALSE);
                    if (wcscmp(Search->Search, UnicodeString.Buffer) == 0)
                        break;
                }
            }
        }

        /* if we make it here we found no match, so move to the next file */
        Search->Index++;
        if (Search->Index >= PCABHeader->FileCount)
        {
            /* we have reached the end of this cabinet */
            DPRINT("End of cabinet reached\n");
            return CAB_STATUS_NOFILE;
        }
        else
            Search->File = (PCFFILE)(strchr((char *)(Search->File + 1), 0) + 1);
    }

    DPRINT("Found file %s\n", Search->File->FileName);
    return CAB_STATUS_SUCCESS;
}

#if 0
int
Validate()
{
    return (int)RtlValidateHeap(ProcessHeap, 0, 0);
}
#endif

/*
 * FUNCTION: Extracts a file from the cabinet
 * ARGUMENTS:
 *     Search = Pointer to PCAB_SEARCH structure used to locate the file
 * RETURNS
 *     Status of operation
 */
ULONG
CabinetExtractFile(PCAB_SEARCH Search)
{
    ULONG Size;                 // remaining file bytes to decompress
    ULONG CurrentOffset;        // current uncompressed offset within the folder
    PUCHAR CurrentBuffer;       // current pointer to compressed data in the block
    LONG RemainingBlock;        // remaining comp data in the block
    HANDLE DestFile;
    HANDLE DestFileSection;
    PVOID DestFileBuffer;       // mapped view of dest file
    PVOID CurrentDestBuffer;    // pointer to the current position in the dest view
    PCFDATA CFData;             // current data block
    ULONG Status;
    FILETIME FileTime;
    WCHAR DestName[MAX_PATH];
    NTSTATUS NtStatus;
    UNICODE_STRING UnicodeString;
    ANSI_STRING AnsiString;
    IO_STATUS_BLOCK IoStatusBlock;
    OBJECT_ATTRIBUTES ObjectAttributes;
    FILE_BASIC_INFORMATION FileBasic;
    PCFFOLDER CurrentFolder;
    LARGE_INTEGER MaxDestFileSize;
    LONG InputLength, OutputLength;
    char Junk[512];

    if (wcscmp(Search->Cabinet, CabinetName) != 0)
    {
        /* the file is not in the current cabinet */
        DPRINT("File is not in this cabinet (%S != %S)\n",
               Search->Cabinet, CabinetName);
        return CAB_STATUS_NOFILE;
    }

    /* look up the folder that the file specifies */
    if (Search->File->FolderIndex == 0xFFFD ||
        Search->File->FolderIndex == 0xFFFF)
    {
        /* folder is continued from previous cabinet,
           that shouldn't happen here */
        return CAB_STATUS_NOFILE;
    }
    else if (Search->File->FolderIndex == 0xFFFE)
    {
        /* folder is the last in this cabinet and continues into next */
        CurrentFolder = &CabinetFolders[PCABHeader->FolderCount - 1];
    }
    else
    {
        /* folder is completely contained within this cabinet */
        CurrentFolder = &CabinetFolders[Search->File->FolderIndex];
    }

    switch (CurrentFolder->CompressionType & CAB_COMP_MASK)
    {
        case CAB_COMP_NONE:
            CabinetSelectCodec(CAB_CODEC_RAW);
            break;
        case CAB_COMP_MSZIP:
            CabinetSelectCodec(CAB_CODEC_MSZIP);
            break;
        default:
            return CAB_STATUS_UNSUPPCOMP;
    }

    DPRINT("Extracting file at uncompressed offset (0x%X) Size (%d bytes)\n",
           (UINT)Search->File->FileOffset, (UINT)Search->File->FileSize);

    RtlInitAnsiString(&AnsiString, Search->File->FileName);
    wcscpy(DestName, DestPath);
    UnicodeString.MaximumLength = sizeof(DestName) - wcslen(DestName) * sizeof(WCHAR);
    UnicodeString.Buffer = DestName + wcslen(DestName);
    UnicodeString.Length = 0;
    RtlAnsiStringToUnicodeString(&UnicodeString, &AnsiString, FALSE);

    /* Create destination file, fail if it already exists */
    RtlInitUnicodeString(&UnicodeString, DestName);

    InitializeObjectAttributes(&ObjectAttributes,
                               &UnicodeString,
                               OBJ_CASE_INSENSITIVE,
                               NULL, NULL);

    NtStatus = NtCreateFile(&DestFile,
                            GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE,
                            &ObjectAttributes,
                            &IoStatusBlock,
                            NULL,
                            FILE_ATTRIBUTE_NORMAL,
                            0,
                            FILE_CREATE,
                            FILE_SYNCHRONOUS_IO_NONALERT,
                            NULL, 0);

    if (!NT_SUCCESS(NtStatus))
    {
        DPRINT("NtCreateFile() failed (%S) (%x)\n", DestName, NtStatus);

        /* If file exists, ask to overwrite file */
        if (OverwriteHandler == NULL || OverwriteHandler(Search->File, DestName))
        {
            /* Create destination file, overwrite if it already exists */
            NtStatus = NtCreateFile(&DestFile,
                                    GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE,
                                    &ObjectAttributes,
                                    &IoStatusBlock,
                                    NULL,
                                    FILE_ATTRIBUTE_NORMAL,
                                    0,
                                    FILE_OVERWRITE,
                                    FILE_SYNCHRONOUS_IO_ALERT,
                                    NULL, 0);

            if (!NT_SUCCESS(NtStatus))
            {
                DPRINT("NtCreateFile() failed (%S) (%x)\n", DestName, NtStatus);
                return CAB_STATUS_CANNOT_CREATE;
            }
        }
        else
        {
            DPRINT("File (%S) exists\n", DestName);
            return CAB_STATUS_FILE_EXISTS;
        }
    }

    MaxDestFileSize.QuadPart = Search->File->FileSize;
    NtStatus = NtCreateSection(&DestFileSection,
                               SECTION_ALL_ACCESS,
                               0,
                               &MaxDestFileSize,
                               PAGE_READWRITE,
                               SEC_COMMIT,
                               DestFile);

    if (!NT_SUCCESS(NtStatus))
    {
        DPRINT("NtCreateSection failed: %x\n", NtStatus);
        Status = CAB_STATUS_NOMEMORY;
        goto CloseDestFile;
    }

    DestFileBuffer = 0;
    DestFileSize = 0;
    NtStatus = NtMapViewOfSection(DestFileSection,
                                  NtCurrentProcess(),
                                  &DestFileBuffer,
                                  0, 0, 0,
                                  &DestFileSize,
                                  ViewUnmap,
                                  0,
                                  PAGE_READWRITE);

    if (!NT_SUCCESS(NtStatus))
    {
        DPRINT("NtMapViewOfSection failed: %x\n", NtStatus);
        Status = CAB_STATUS_NOMEMORY;
        goto CloseDestFileSection;
    }

    CurrentDestBuffer = DestFileBuffer;
    if (!ConvertDosDateTimeToFileTime(Search->File->FileDate,
                                      Search->File->FileTime,
                                      &FileTime))
    {
        DPRINT("DosDateTimeToFileTime() failed\n");
        Status = CAB_STATUS_CANNOT_WRITE;
        goto UnmapDestFile;
    }

    NtStatus = NtQueryInformationFile(DestFile,
                                      &IoStatusBlock,
                                      &FileBasic,
                                      sizeof(FILE_BASIC_INFORMATION),
                                      FileBasicInformation);
    if (!NT_SUCCESS(NtStatus))
    {
        DPRINT("NtQueryInformationFile() failed (%x)\n", NtStatus);
    }
    else
    {
        memcpy(&FileBasic.LastAccessTime, &FileTime, sizeof(FILETIME));

        NtStatus = NtSetInformationFile(DestFile,
                                        &IoStatusBlock,
                                        &FileBasic,
                                        sizeof(FILE_BASIC_INFORMATION),
                                        FileBasicInformation);
        if (!NT_SUCCESS(NtStatus))
        {
            DPRINT("NtSetInformationFile() failed (%x)\n", NtStatus);
        }
    }

    SetAttributesOnFile(Search->File, DestFile);

    /* Call extract event handler */
    if (ExtractHandler != NULL)
    {
        ExtractHandler(Search->File, DestName);
    }

    if (Search->CFData)
        CFData = Search->CFData;
    else
        CFData = (PCFDATA)(CabinetFolders[Search->File->FolderIndex].DataOffset + FileBuffer);

    CurrentOffset = Search->Offset;
    while (CurrentOffset + CFData->UncompSize <= Search->File->FileOffset)
    {
        /* walk the data blocks until we reach
           the one containing the start of the file */
        CurrentOffset += CFData->UncompSize;
        CFData = (PCFDATA)((char *)(CFData + 1) + DataReserved + CFData->CompSize);
    }
    
    Search->CFData = CFData;
    Search->Offset = CurrentOffset;

    /* now decompress and discard any data in
       the block before the start of the file */

    /* start of comp data */
    CurrentBuffer = ((unsigned char *)(CFData + 1)) + DataReserved;
    RemainingBlock = CFData->CompSize;
    InputLength = RemainingBlock;

    while (CurrentOffset < Search->File->FileOffset)
    {
        /* compute remaining uncomp bytes to start
           of file, bounded by sizeof junk */
        OutputLength = Search->File->FileOffset - CurrentOffset;
        if (OutputLength > (LONG)sizeof(Junk))
            OutputLength = sizeof (Junk);

        /* negate to signal NOT end of block */
        OutputLength = -OutputLength;
        CodecUncompress(Junk, CurrentBuffer, &InputLength, &OutputLength);
        /* add the uncomp bytes extracted to current folder offset */
        CurrentOffset += OutputLength;
        /* add comp bytes consumed to CurrentBuffer */
        CurrentBuffer += InputLength;
        /* subtract bytes consumed from bytes remaining in block */
        RemainingBlock -= InputLength;
        /* neg for resume decompression of the same block */
        InputLength = -RemainingBlock;
    }

    /* now CurrentBuffer points to the first comp byte
       of the file, so we can begin decompressing */

    /* Size = remaining uncomp bytes of the file to decompress */
    Size = Search->File->FileSize;
    while (Size > 0)
    {
        OutputLength = Size;
        DPRINT("Decompressing block at %x with RemainingBlock = %d, Size = %d\n",
               CurrentBuffer, RemainingBlock, Size);

        Status = CodecUncompress(CurrentDestBuffer,
                                 CurrentBuffer,
                                 &InputLength,
                                 &OutputLength);

        if (Status != CS_SUCCESS)
        {
            DPRINT("Cannot uncompress block\n");
            if (Status == CS_NOMEMORY)
                Status = CAB_STATUS_NOMEMORY;
            Status = CAB_STATUS_INVALID_CAB;
            goto UnmapDestFile;
        }

        /* advance dest buffer by bytes produced */
        CurrentDestBuffer = (PVOID)((ULONG_PTR)CurrentDestBuffer + OutputLength);
        /* advance src buffer by bytes consumed */
        CurrentBuffer += InputLength;
        /* reduce remaining file bytes by bytes produced */
        Size -= OutputLength;
        /* reduce remaining block size by bytes consumed */
        RemainingBlock -= InputLength;
        if (RemainingBlock == 0)
        {
            /* used up this block, move on to the next */
            DPRINT("Out of block data\n");
            CFData = (PCFDATA)CurrentBuffer;
            RemainingBlock = CFData->CompSize;
            CurrentBuffer = (unsigned char *)(CFData + 1) + DataReserved;
            InputLength = RemainingBlock;
        }
    }

    Status = CAB_STATUS_SUCCESS;

UnmapDestFile:
    NtUnmapViewOfSection(NtCurrentProcess(), DestFileBuffer);

CloseDestFileSection:
    NtClose(DestFileSection);

CloseDestFile:
    NtClose(DestFile);

    return Status;
}

/*
 * FUNCTION: Selects codec engine to use
 * ARGUMENTS:
 *     Id = Codec identifier
 */
VOID
CabinetSelectCodec(ULONG Id)
{
    if (CodecSelected)
    {
        if (Id == CodecId)
            return;

        CodecSelected = FALSE;
    }

    switch (Id)
    {
        case CAB_CODEC_RAW:
            CodecUncompress = RawCodecUncompress;
            break;
        case CAB_CODEC_MSZIP:
            CodecUncompress = MSZipCodecUncompress;
            break;
        default:
            return;
    }

    CodecId = Id;
    CodecSelected = TRUE;
}

/*
 * FUNCTION: Set event handlers
 * ARGUMENTS:
 *     Overwrite = Handler called when a file is to be overwritten
 *     Extract = Handler called when a file is to be extracted
 *     DiskChange = Handler called when changing the disk
 */
VOID
CabinetSetEventHandlers(PCABINET_OVERWRITE Overwrite,
                        PCABINET_EXTRACT Extract,
                        PCABINET_DISK_CHANGE DiskChange)
{
    OverwriteHandler = Overwrite;
    ExtractHandler = Extract;
    DiskChangeHandler = DiskChange;
}

/*
 * FUNCTION: Get pointer to cabinet reserved area. NULL if none
 */
PVOID
CabinetGetCabinetReservedArea(PULONG Size)
{
    if (CabinetReservedArea != NULL)
    {
        if (Size != NULL)
        {
            *Size = CabinetReserved;
        }

        return CabinetReservedArea;
    }
    else
    {
        if (Size != NULL)
        {
            *Size = 0;
        }

        return NULL;
    }
}