OSI/FTAM Responder Manual

Compaq FTAM Responder Support of
ISO FTAM Functions
OSI/FTAM Responder Manual—425199-001
4-8
Select-Open Mappings
When you issue a file-open request, you specify a contents-type parameter that provides
the document type of the file and, optionally, parameter values that further define the
document type. When a remote initiator sends a file-open request to the Compaq
responder and specifies a contents type of unknown on the open request, the contents
type returned by the responder yields the appropriate FTAM document type according to
the requirements of the file system and as outlined in Table 4-7. If the file-open request
indicates an FTAM document type (rather than unknown) for the contents type, the
document type must generally be consistent with the mapping of Guardian file types to
FTAM document types shown in Table 4-7. If the document type is not consistent with
the values shown in Table 4-7, the responder returns a negative confirm that includes
diagnostic message 5036, contents type inconsistent.
If the maximum-string-length parameter of the contents type is specified, the responder
checks the proposed value before performing the select or open service. For the select
or open to succeed, the value of the maximum-string-length parameter must fall within
the range supported by the Compaq responder for that document type and string-
significance value, as follows (where record length is the standard Guardian file attribute
that stands for the maximum record length):
If the proposed maximum-string-length value does not fall within the defined range, the
responder returns a negative confirm containing diagnostic message 5036.
In addition, the contents type is an FTAM file attribute. When a remote FTAM initiator
sends a read-attribute request, the value of the contents-type attribute that the Compaq
responder returns is one of the FTAM document types listed in Table 4-7.
Document
Type
String-Significance
Value
Valid Maximum-String-Length
Value(s)
FTAM-1 not-significant 1 <= maximum-string-length <= 7148
FTAM-2 not-significant maximum-string-length <= record length
FTAM-3 not-significant 1 <= maximum-string-length <= 4096
FTAM-3 fixed maximum-string-length = record length
FTAM-3 variable maximum-string-length <= record length
Table 4-7. Select-Open Mappings: Compaq File Structure to FTAM Contents
Type
Compaq File Structure Contents Type
Description File
Type*
File
Code
FTAM
Document
Types
Default Parameter Values
Standard edit
file
U 101**** FTAM-1
universal-class = 25 (Graphic String)
maximum-string-length = 7148
string-significance = not-significant
Enscribe
relative file
R- FTAM-2
universal-class = 25 (Graphic String)
maximum-string-length = record length**
string-significance = not-significant
SQL table,
organization
relative
R- FTAM-2
universal-class = 25 (Graphic String)
maximum-string-length = record length**
string-significance = not significant