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Descriptors should be used. For example a Logical Volume created for a jukebox. NOTE: T<strong>here</strong> is a benefit of using Long Allocation Descriptors even on a single volume, which is the support of tracking erased extents on rewritable media. See section 2.3.10.1 for additional information. For both Short and Long Allocation Descriptors, if the 30 least significant bits of the ExtentLength field is 0, then the 2 most significant bits shall be 0. NOTE: For volumes in which a Virtual Partition Map is recorded: • Allocation Descriptors identifying virtual space shall have an extent length of theone block size or less. Allocation descriptors identifying file data, directories, or stream data shall identify physical space. ICBs recorded in virtual space shall use long_ad allocation descriptors to identify physical space. The use of short_ad allocation descriptors would identify file data in virtual space if the ICB were in virtual space. • Descriptors recorded in virtual space shall have the virtual logical block number recorded in the Tag Location field. NOTE: For volumes in which a Metadata Partition Map is recorded: • Allocation descriptors identifying directory or stream directory data shall identify metadata space. • Allocation descriptors identifying file or stream data shall identify physical space. • Allocation descriptors recorded in metadata space shall use SHORT_ADs when identifying extents also in metadata space. • Allocation descriptors having an extent type of 3 (continuation) shall identify an extent in the same partition in which the type 3 descriptor itself is recorded. • Descriptors recorded in metadata space shall have their metadata space logical block number recorded in their descriptor tag TagLocation field, if applicable. UDF 2.01 61 March50 April
2.3.10.1 Long Allocation Descriptor struct long_ad { /* ECMA 167 4/14.14.2 */ Uint32 ExtentLength; Lb_addr ExtentLocation; byte ImplementationUse[6]; } To allow use of the ImplementationUse field by UDF and also by implementations the following structure shall be recorded within the 6-byte Implementation Use field. struct ADImpUse { Uint16 flags; byte impUse[4]; } /* * ADImpUse Flags (NOTE: bits 1-15 reserved for future use by UDF) */ #define EXTENTErased (0x01) In the interests of efficiency on Rewritable media that benefits from preprocessing, the EXTENTErased flag shall be set to ONE to indicate an erased extent. This applies only to extents of type not recorded but allocated. 2.3.11 Allocation Extent Descriptor struct AllocationExtentDescriptor { /* ECMA 167 4/14.5 */ struct tag DescriptorTag; Uint32 PreviousAllocationExtentLocation; Uint32 LengthOfAllocationDescriptors; } The Allocation Extent Descriptor does not contain the Allocation Descriptors itself. UDF will interpret ECMA 167, 4/14.5 in such a way that the Allocation Descriptors will start on the first byte following the LengthOfAllocationDescriptors field of the Allocation Extent Descriptor. The Allocation Extent Descriptor together with its Allocation Descriptors constitutes an extent of allocation descriptors. The length of an extent of allocation descriptors shall not exceed the logical block size. Unused bytes following the Allocation Descriptors till the end of the logical block shall have a value of #00. 2.3.11.1 Struct tag DescriptorTag The DescriptorCRCLength of the DescriptorTag should include the Allocation Descriptors following the Allocation Extent Descriptor. The DescriptorCRCLength shall be either 8 or 8 + LengthOfAllocationDescriptors. UDF 2.01 62 March50 April
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Universal Disk Format ® Specificat
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REVISION HISTORY 1.00 October 24, 1
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CONTENTS 1. INTRODUCTION ..........
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6.4 OSTA Compressed Unicode Algorit
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1. Introduction The OSTA Universal
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1.2 Compliance This document requir
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Media Block Address NOTE 1: This is
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1.3.3 Terms May Optional Shall Shou
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non-overlapping Partitions with 2 p
Page 20 and 21: 2.1 Part 1 - General 2.1.1 Characte
Page 22 and 23: length of the field. The characters
Page 24 and 25: 2.1.5.2 char Identifier[23] Unless
Page 26 and 27: The Suffix Type column in the above
Page 28 and 29: For an Application Entity Identifie
Page 30 and 31: 2.2 Part 3 - Volume Structure 2.2.1
Page 32 and 33: NOTE: This field is used to determi
Page 34 and 35: 2.2.4 Logical Volume Descriptor str
Page 36 and 37: 2.2.5 Unallocated Space Descriptor
Page 38 and 39: EntityID. The scope of this EntityI
Page 40 and 41: 2.2.7.2.2 dstring LogicalVolumeIden
Page 42 and 43: Layout of Type 2 partition map for
Page 44 and 45: • Bits 1-7: Reserved. Shall be se
Page 46 and 47: Virtual Allocation Table structure
Page 48 and 49: the offset and length of a partitio
Page 50 and 51: The Metadata Partition Map (see2.2.
Page 52 and 53: 2.2.13.1 Metadata File (and Metadat
Page 54 and 55: 2.2.13.4 Procedure for de-allocatin
Page 56 and 57: } struct EntityID byte byte Impleme
Page 58 and 59: 2.3.2 File Set Descriptor struct Fi
Page 60 and 61: 2.3.2.7 struct EntityID DomainIdent
Page 62 and 63: In order to assist a UDF implementa
Page 64 and 65: 2.3.5.1 Uint16 StrategyType The co
Page 66 and 67: 2.3.6 File Entry struct FileEntry {
Page 68 and 69: 2.3.6.8 FileLinkCount Hard links to
Page 72 and 73: 2.3.11.2 Uint32 PreviousAllocationE
Page 74 and 75: 3.2 Part 3 - Volume Structure 3.2.1
Page 76 and 77: 3.3 Part 4 - File System 3.3.1 File
Page 78 and 79: 3.3.2.1.2 Macintosh Bits 6 & 7 (Set
Page 80 and 81: 3.3.3 File Entry struct FileEntry {
Page 82 and 83: would be considered writable if the
Page 84 and 85: 3.3.3.5 byte Extended Attributes Se
Page 86 and 87: ignored and the file creation time
Page 88 and 89: 3.3.4.5.1.1 FreeEASpace This extend
Page 90 and 91: MacVolumeInfo format RBP Length Nam
Page 92 and 93: UDFFXInfo format (Volume IV, page 1
Page 94 and 95: The ApplicationUse area for this ex
Page 96 and 97: stream directory. If present, there
Page 98 and 99: Since the streams listed above have
Page 100 and 101: Object Logical Block Number is the
Page 102 and 103: mechanism for the host software to
Page 104 and 105: Vendor ID - The Vendor ID reported
Page 106 and 107: The OS2EA Stream contains a table o
Page 108 and 109: 4.2.2 File Identifier Descriptor st
Page 110 and 111: Definitions: A FileIdentifier shall
Page 112 and 113: 3. Invalid Characters: A FileIdenti
Page 114 and 115: 4. Trailing Periods and Spaces: All
Page 116 and 117: If there is a file extension then t
Page 118 and 119: defined as space that is not direct
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UDF 2.01 111 March50 April
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6.2 UDF Entity Identifier Values En
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8 0 BeOS - generic 9 0 Windows CE -
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} } returnValue = unicodeIndex; } r
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} return crc; #ifdef MAIN unsigned
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6.6 Algorithm for Strategy Type 409
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nameLen = udfNameLen; } else { /* A
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} needsCRC = TRUE; /* Append the CR
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if (index < udfLabelLen || index ==
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UDF 2.01 129 March50 April
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unicode_t *udfName, /* (Input) Name
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} #ifdef (OS2 | WIN_95 | WIN_NT) /*
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6.8 Extended Attribute Checksum Alg
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• The data of each file shall be
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Read the File Identifier Descriptor
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• An intermediate state is allowe
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• The host shall perform read/mod
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6.10.2.6.3 Level 3 No restrictions
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ISO 9660 converted to UDF 1 st sess
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For File Structure: 5. Unallocated
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6.13 Recommendations for DVD+R and
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6.13.1.4.2 Anchor Volume Descriptor
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6.13.2.1 Requirements • The packe
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6.126.15 UDF Media Format Revision
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Description DCN Updated in UDF Revi
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Registration Form Disk Format Speci
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L Logical Block Size, 8, 9, 2425 Lo
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