2.2.32.4.1 HASH_HEADER
All content information files MUST start with a valid format HASH_HEADER as follows.
Content information follows this header at an offset indicated by the HashBlobOffset field, if HashVersion is set to SRV_HASH_VER_1, the Content Information data structure is as specified in [MS-PCCRC] section 2.3; if HashVersion is set to SRV_HASH_VER_2, the Content Information data structure is as specified in [MS-PCCRC] section 2.4.
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HashType |
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HashVersion |
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SourceFileChangeTime |
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SourceFileSize |
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HashBlobLength |
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HashBlobOffset |
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Dirty |
SourceFileNameLength |
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SourceFileName (variable) |
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HashType (4 bytes): The hash type indicates what the hash is used for. This field MUST be constructed using the following value.
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Value
Meaning
SRV_HASH_TYPE_PEER_DIST
0x00000001
Indicates that the hash is used for branch caching as described in [MS-PCCRC].
HashVersion (4 bytes): The version number of the algorithm used to create the Content Information. This field MUST be constructed using one of the following values.
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Value
Meaning
SRV_HASH_VER_1
0x00000001
Branch cache version 1.
SRV_HASH_VER_2
0x00000002
Branch cache version 2. This value is only applicable for servers that implement the SMB 3.x dialect family.
SourceFileChangeTime (8 bytes): The last update time for the source file from which the Content Information is generated, in FILETIME format as specified in [MS-DTYP] section 2.3.3.
SourceFileSize (8 bytes): The length, in bytes, of the source file from which the Content Information is generated.
HashBlobLength (4 bytes): The length, in bytes, of the Content Information.
HashBlobOffset (4 bytes): The offset of the Content Information, in bytes, from the beginning of the Content Information File.
Dirty (2 bytes): A flag that indicates whether the Content Information File is currently being updated. A nonzero value indicates TRUE.
SourceFileNameLength (2 bytes): The length, in bytes, of the source file full name.
SourceFileName (variable): A variable-length buffer that contains the source file full name, with length indicated by SourceFileNameLength.<70>