2.4.2.2 Variable Length Property or Multiple-Valued Property Entry
The entry for a variable length property has the following structure.
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Property Tag |
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Flags |
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Size |
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Reserved |
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Property Tag (4 bytes): Same as the description in section 2.4.2.1.
Flags (4 bytes): Same as the description in section 2.4.2.1.
Size (4 bytes): This value is interpreted based on the property type, which is specified in the Property Tag field. If the message contains an embedded message attachment or a storage attachment, this field MUST be set to 0xFFFFFFFF. Otherwise, the following table shows how this field is interpreted for each property type. The property types are specified in [MS-OXCDATA] section 2.11.1.
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Property type |
Meaning of Size value |
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Variable length property, except for PtypString or PtypString8 |
Size MUST be equal to the size of the stream where the value of the property represented by this entry is stored. |
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PtypString |
Size MUST be equal to 2 plus the size of the stream where the value of the property represented by this entry is stored. The string being stored MUST<2> have at least one character. When parsing property streams, clients MUST issue a MAPI_E_BAD_VALUE error for any zero-length property streams of PtypString. |
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PtypString8 |
Size MUST be equal to 1 plus the size of the stream where the value of the property represented by this entry is stored. The string being stored MUST have at least one character. When parsing property streams, clients MUST issue a MAPI_E_BAD_VALUE error for any zero-length property streams of PtypString8. |
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Multiple-valued fixed length property |
Size MUST be equal to the size of the stream where all values of the property represented by this entry are stored. |
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Multiple-valued variable length property |
Size MUST be equal to the size of the length stream where the lengths of the value streams for the property represented by this entry are stored. |
Reserved (4 bytes): This field MUST be ignored when reading a .msg file. When writing a .msg file, this field MUST be set to 0 if the message does not contain an attachment. This field MUST be set to 0x01 if the message contains an embedded message attachment and to 0x04 if the message contains a storage attachment. The following table shows the required value for this field based on the value of the PidTagAttachMethod property ([MS-OXCMSG] section 2.2.2.9).
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PidTagAttachMethod property value |
Required Reserved field value |
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ATTACH_EMBEDDED_MSG (0x00000005) |
0x01 |
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ATTACH_OLE (0x00000006) |
0x04 |