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Since the streams listed above have the Metadata flag set, the implementation shall not pass the name of the stream across the “plug-in file system interface” of a platform. 3.3.7.1 UniqueUnique ID Mapping Data Stream The Unique ID Mapping Data allows an implementation to go directly to the ICB hierarchy for the file/directory associated with a UDFUniqueUDF Unique ID, or to the ICB hierarchy for the directory whichthat contains the file/directory associated with the UDFUniqueID. UDF Unique ID. Note that for UDF release 2.00 and higher the UDF Unique ID value used for this purpose is taken from the File Identifier Descriptor rather than from the File Entry. Unique ID Mapping Data is stored as a named stream of the System Stream Directory (associated with the File Set Descriptor). The name of this stream shall be set to: “*UDF Unique ID Mapping Data” The Metadata bit in the File Characteristics field of the File Identifier Descriptor for the stream shall be set to 1 to indicate that the existence of this filestream should not be made known to clients of a platform’s file system interface. Rules for the presence and consistency of the Unique ID Mapping Data Stream: • Shall be created for read-only media • Shall be created by implementations whichwith batch write (e.g., pre-mastering tools) a volume on write-once and rewritable media For implementations which perform incremental updates of volumes on write-once or rewritable media (e.g., on-line file systems), the following rules apply: • May be created and maintained if not present • Shall be maintained if present and volume is clean • Should be repaired and maintained, but may be deleted, if present and volume is dirty For these rules, a volume is clean if either a valid Close Logical Volume Integrity Descriptor or a valid Virtual Allocation Table is recorded. 3.3.7.1.1 UDF Unique ID Mapping Data The contents of the Unique ID Mapping streamStream are described by the tabletables “UDF Unique ID Mapping Data” whichand “UDF Unique ID Mapping Entry”. The mapping data contains some header fields before an array of “UDF Unique ID Mapping Entry.” mapping entries. The fields of these structures are described below their corresponding table. UDF 2.01 89 March50 April
UDF Unique ID Mapping Data RBP Length Name Contents 0 32 Implementation Identifier EntityID 32 4 Flags Uint32 36 4 Mapping Entry Count (=MEC) Uint32 40 8 Reserved Bytes (= #00) 48 16*MEC Mapping Entries IDMappingEntry Implementation Identifier is described in section 2.1.5. Flags are defined as follows: Bit 0, If Bit 0 Bits 1 – 31 Index Bit Reserved, shall be set to ZERO Index Bit set to ONE, shall mean is called Index Mode. In Index Mode, the UDF Unique ID, once decremented by 16 (the value NextUniqueID is initialized to), can be used as an index into the array Mapping Entries. Blank entries, if present, are all beyond the last array element with a UDF Unique ID. Bits 1 – 31, reserved, shall be set to ZERO. Mapping Entry Count is the size, in entries, of the array Mapping Entries. Mapping Entries is an array of UDF Unique ID Mapping Entry structures. T<strong>here</strong> is one mapping entry for every non-stream, non-parent File Identifier Descriptor. Whenever the volume is consistent, the array is always sorted in ascending order of UDF Unique ID. Except as limited by the flags, blank entries are allowed anyw<strong>here</strong> in the array, and entries are not required to have a UDF Unique ID value of one more than the preceding entry. A blank entry has a value of ZERO in all fields. 3.3.7.1.2 UDF Unique ID Mapping Entry UDF Unique ID Mapping Entry RBP Length Name Contents 0 4 UDFUnique ID Uint32 4 4 Parent Logical Block Number Uint32 8 4 Object Logical Block Number Uint32 12 2 Parent Partition Reference Number Uint16 14 2 Object Partition Reference Number Uint16 UDF Unique ID is the value found in a the FID for the file or directoryidentifying the object. Parent Logical Block Number is the logical block number of the ICB identifying the directory that contains the FID identifying the object. UDF 2.01 90 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
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2.1 Part 1 - General 2.1.1 Characte
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length of the field. The characters
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2.1.5.2 char Identifier[23] Unless
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The Suffix Type column in the above
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For an Application Entity Identifie
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2.2 Part 3 - Volume Structure 2.2.1
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NOTE: This field is used to determi
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2.2.4 Logical Volume Descriptor str
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2.2.5 Unallocated Space Descriptor
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EntityID. The scope of this EntityI
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2.2.7.2.2 dstring LogicalVolumeIden
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Layout of Type 2 partition map for
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• Bits 1-7: Reserved. Shall be se
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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 70 and 71: Descriptors should be used. For exa
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 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
Page 120 and 121: UDF 2.01 111 March50 April
Page 122 and 123: 6.2 UDF Entity Identifier Values En
Page 124 and 125: 8 0 BeOS - generic 9 0 Windows CE -
Page 126 and 127: } } returnValue = unicodeIndex; } r
Page 128 and 129: } return crc; #ifdef MAIN unsigned
Page 130 and 131: 6.6 Algorithm for Strategy Type 409
Page 132 and 133: nameLen = udfNameLen; } else { /* A
Page 134 and 135: } needsCRC = TRUE; /* Append the CR
Page 136 and 137: if (index < udfLabelLen || index ==
Page 138 and 139: UDF 2.01 129 March50 April
Page 140 and 141: unicode_t *udfName, /* (Input) Name
Page 142 and 143: } #ifdef (OS2 | WIN_95 | WIN_NT) /*
Page 144 and 145: 6.8 Extended Attribute Checksum Alg
Page 146 and 147: • 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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