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sys-file-reader: Tolerate nonsensical opcodes in compressed data.
[pspp-builds.git]
/
doc
/
dev
/
system-file-format.texi
diff --git
a/doc/dev/system-file-format.texi
b/doc/dev/system-file-format.texi
index 70fa385c7525efea051a5bfb90fbf046bdb7e14b..b1be385334bf5ef3f8aa1adfcfdecb10d9adaf3d 100644
(file)
--- a/
doc/dev/system-file-format.texi
+++ b/
doc/dev/system-file-format.texi
@@
-884,6
+884,9
@@
value @var{code} - @var{bias}, where
variable @code{bias} from the file header. For example,
code 105 with bias 100.0 (the normal value) indicates a numeric variable
of value 5.
variable @code{bias} from the file header. For example,
code 105 with bias 100.0 (the normal value) indicates a numeric variable
of value 5.
+One file has been seen written by SPSS 14 that contained such a code
+in a @emph{string} field with the value 0 (after the bias is
+subtracted) as a way of encoding null bytes.
@item 252
End of file. This code may or may not appear at the end of the data
@item 252
End of file. This code may or may not appear at the end of the data