iso.h File Reference

#include <pshpack1.h>
#include <poppack.h>

Include dependency graph for iso.h:

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Go to the source code of this file.

Classes
struct	_DIR_RECORD
struct	_VD_HEADER
struct	_PVD
struct	_ISO_FILE_INFO

Macros
#define	ISO_ATTR_HIDDEN   0x01
#define	ISO_ATTR_DIRECTORY   0x02
#define	ISO_ATTR_ASSOC   0x04
#define	ISO_ATTR_MULTI   0x80

Typedefs
typedef struct _DIR_RECORD	DIR_RECORD
typedef struct _DIR_RECORD *	PDIR_RECORD
typedef struct _VD_HEADER	VD_HEADER
typedef struct _VD_HEADER *	PVD_HEADER
typedef struct _PVD	PVD
typedef struct _PVD *	PPVD
typedef struct _ISO_FILE_INFO	ISO_FILE_INFO
typedef struct _ISO_FILE_INFO *	PISO_FILE_INFO

Functions
ULONGLONG	IsoGetVolumeSize (_In_ ULONG DeviceId)
	Returns the size of the ISO-9660 volume laid on the storage media device opened via DeviceId.
const DEVVTBL *	IsoMount (ULONG DeviceId)

Macro Definition Documentation

ISO_ATTR_ASSOC

#define ISO_ATTR_ASSOC   0x04

Definition at line 94 of file iso.h.

ISO_ATTR_DIRECTORY

#define ISO_ATTR_DIRECTORY   0x02

Definition at line 93 of file iso.h.

ISO_ATTR_HIDDEN

#define ISO_ATTR_HIDDEN   0x01

Definition at line 92 of file iso.h.

ISO_ATTR_MULTI

#define ISO_ATTR_MULTI   0x80

Definition at line 95 of file iso.h.

Typedef Documentation

DIR_RECORD

typedef struct _DIR_RECORD DIR_RECORD

ISO_FILE_INFO

typedef struct _ISO_FILE_INFO ISO_FILE_INFO

PDIR_RECORD

typedef struct _DIR_RECORD * PDIR_RECORD

PISO_FILE_INFO

typedef struct _ISO_FILE_INFO * PISO_FILE_INFO

PPVD

typedef struct _PVD * PPVD

PVD

typedef struct _PVD PVD

PVD_HEADER

typedef struct _VD_HEADER * PVD_HEADER

VD_HEADER

typedef struct _VD_HEADER VD_HEADER

Function Documentation

IsoGetVolumeSize()

ULONGLONG IsoGetVolumeSize

(

_In_ ULONG

DeviceId

)

Returns the size of the ISO-9660 volume laid on the storage media device opened via DeviceId.

This routine is in particular used to determine the useful (volume) size of a CD-ROM media.

Definition at line 583 of file iso.c.

{
    PISO_VOLUME_INFO Volume = IsoVolumes[DeviceId];
    ASSERT(Volume);
    return (ULONGLONG)Volume->VolumeSizeLBN * Volume->LogicalBlockSize;
}

Referenced by FsGetVolumeSize().

IsoMount()

const DEVVTBL * IsoMount

(

ULONG

DeviceId

)

Definition at line 602 of file iso.c.

{
    UCHAR Buffer[SECTORSIZE];
    PPVD Pvd = (PPVD)Buffer;
    LARGE_INTEGER Position;
    ULONG Count;
    ARC_STATUS Status;
    PISO_VOLUME_INFO Volume;
 
    TRACE("Enter IsoMount(%lu)\n", DeviceId);
 
    /* Read the ISO Primary Volume Descriptor */
    Position.QuadPart = 16 * SECTORSIZE;
    Status = ArcSeek(DeviceId, &Position, SeekAbsolute);
    if (Status != ESUCCESS)
        return NULL;
    Status = ArcRead(DeviceId, Pvd, SECTORSIZE, &Count);
    if (Status != ESUCCESS || Count < sizeof(PVD))
        return NULL;
 
    /* Check whether the PVD is valid */
    if (!(Pvd->VdType == 1 && RtlEqualMemory(Pvd->StandardId, "CD001", 5) && Pvd->VdVersion == 1))
    {
        WARN("Unrecognized CD-ROM format\n");
        return NULL;
    }
    if (Pvd->LogicalBlockSizeL != SECTORSIZE)
    {
        ERR("Unsupported LogicalBlockSize %u\n", Pvd->LogicalBlockSizeL);
        return NULL;
    }
 
    Count = (ULONG)((ULONGLONG)Pvd->VolumeSpaceSizeL * SECTORSIZE / 1024 / 1024);
    TRACE("Recognized ISO9660 drive, size %lu MB (%lu sectors)\n",
          Count, Pvd->VolumeSpaceSizeL);
 
    Volume = FrLdrTempAlloc(sizeof(*Volume), TAG_ISO_VOLUME);
    if (!Volume)
        return NULL;
    RtlZeroMemory(Volume, sizeof(*Volume));
 
    /*
     * This is equivalent to using the RAW_ISO_VD::VolSpaceI field:
     * https://github.com/reactos/reactos/blob/435482912c6dc0aaa4371e37b7336b2b1291e65f/drivers/filesystems/cdfs/cd.h#L126
     * and also what MS CDFS does with the CdRvdVolSz() macro,
     * in cdfs/strucsup.c!CdUpdateVcbFromVolDescriptor().
     */
    Volume->VolumeSizeLBN = Pvd->VolumeSpaceSizeL;
    Volume->LogicalBlockSize = Pvd->LogicalBlockSizeL;
 
    /* Cache some useful PVD information */
    Volume->PvdDirectorySector = Pvd->RootDirRecord.ExtentLocationL;
    Volume->PvdDirectoryLength = Pvd->RootDirRecord.DataLengthL;
 
    IsoVolumes[DeviceId] = Volume;
 
    /* Everything OK, return the ISO9660 function table */
    return &Iso9660FuncTable;
}