X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=spv-file-format.texi;h=c5d327407feb24465714e5fa51b162d7ae7a624d;hb=860ae7593728a465b1f0d5e443df7e624df9cf30;hp=dff235859b6f9b711dd3362abaf26c3e9a8d3a63;hpb=71ce2a2b4f682c94b744c906769f5fc2dd25f3f0;p=pspp

diff --git a/spv-file-format.texi b/spv-file-format.texi
index dff235859b..c5d327407f 100644
--- a/spv-file-format.texi
+++ b/spv-file-format.texi
@@ -901,10 +901,10 @@ X6 @result{}
     string[@t{command}] string[@t{subcommand}]
     string[@t{language}] string[@t{charset}] string[@t{locale}]
     (00 @math{|} 01) 00 (00 @math{|} 01) (00 @math{|} 01)
-    int
+    int[@t{epoch}]
     byte[@t{decimal}] byte[@t{grouping}]
-    byte*8 01
-    (string[@t{dataset}] string[@t{data file}] i0 int i0)?
+    (2d 43 1c eb e2 36 1a 3f | 00*8) 01
+    (string[@t{dataset}] string[@t{datafile}] i0 int[@t{date}] i0)?
     int[@t{n-ccs}] string*[@t{n-ccs}]
     2e (00 @math{|} 01) (i2000000 i0)?
 @end format
@@ -918,6 +918,12 @@ such as @code{en_US.windows-1252} or @code{it_IT.windows-1252}.  The
 rest of the character strings in the member use this encoding.  The
 encoding string is itself encoded in US-ASCII.
 
+@code{epoch} is the year that starts the epoch.  A 2-digit year is
+interpreted as belonging to the 100 years beginning at the epoch.  The
+default epoch year is 69 years prior to the current year; thus, in
+2017 this field by default contains 1948.  In the corpus, @code{epoch}
+ranges from 1943 to 1948, plus some contain -1.
+
 @code{decimal} is the decimal point character.  The observed values
 are @samp{.} and @samp{,}.
 
@@ -926,6 +932,22 @@ are @samp{.} and @samp{,}.
 @samp{'} (apostrophe), @samp{ } (space), and zero (presumably
 indicating that digits should not be grouped).
 
+@code{dataset} is the name of the dataset analyzed to produce the
+output, e.g.@: @code{DataSet1}, and @code{datafile} the name of the
+file it was read from, e.g.@: @file{C:\Users\foo\bar.sav}.  The latter
+is sometimes the empty string.
+
+@code{date} is a date, as seconds since the epoch, i.e.@: since
+January 1, 1970.  Pivot tables within an SPV files often have dates a
+few minutes apart, so this is probably a creation date for the tables
+rather than for the file.
+
+Sometimes @code{dataset}, @code{datafile}, and @code{date} are present
+and other times they are absent.  The reader can distinguish by
+assuming that they are present and then checking whether the
+presumptive @code{dataset} contains a null byte (a valid string never
+will).
+
 @code{n-ccs} is observed as either 0 or 5.  When it is 5, the
 following strings are CCA through CCE format strings.  @xref{Custom
 Currency Formats,,, pspp, PSPP}.  Most commonly these are all