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SIR$–Symbolic Input/Output Routine
The columns of the table list the source input image type for image n or m, described
above. The types are Fieldata, ASCII, or ASCII-like and other CCSs. The rows of the
table list the runstream image type to be written to the source output. The types are
Fieldata, ASCII, or ASCII-like and other legal CCSs. The intersection of the columns and
rows is the SIR$ source output action with this combination of source input image CCS
type and runstream image CCS type.
Runstream
Input Image
Type
Source Input
Image is
Fieldata
Fieldata Unchanged
Fieldata image
ASCII or
ASCII-like
Translated to
Fieldata image
"Other CCS" Error; image not
written
Source Input
Image is ASCII
or ASCII-like
Translated to
ASCII_ISO
image
Unchanged
ASCII,
ASCII-like image
Error; image not
written
Source Input
Image is
"Other" CCS
Unchanged
Fieldata image
Unchanged
ASCII,
ASCII-like
image
Unchanged
image in
"other" CCS
In summary, when the source input image is Fieldata the P option is assumed; when the
source input image is ASCII or ASCII-like, the Q option is assumed; and when source
input image is in another CCS, both the P and the Q options are assumed.
Note that when the calling program is a multipass processor, the second and
subsequent passes usually read the source output that is written by SIR$ during the first
pass. This means that the CCS of an image processed during the first pass may be
different when the same image is processed during the second and subsequent passes.
For example, if the P option is specified, an ASCII-like source input image in decimal CCS
41 is written to the source output in Fieldata. This means that on the second pass the
image can no longer be identified as a CCS 41 image and, in fact, cannot be
distinguished from images that were originally Fieldata, ASCII, or any of the 39 ASCII-like
CCSs. A more extreme example is that if both the P and Q options are not either
specified or assumed, source input images in the 22 “other” CCSs are not written to the
source output. This means that on the second pass the images cannot be passed to the
calling program since they were not written to the source output on the first pass.
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