1 files changed, 86 insertions, 0 deletions
diff --git a/sys/plio/plsave.x b/sys/plio/plsave.x
new file mode 100644
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--- /dev/null
+++ b/sys/plio/plsave.x
@@ -0,0 +1,86 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include <plset.h>
+include	<plio.h>
+
+# PL_SAVE -- Save a mask in a buffer in a machine independent format.  The user
+# supplied buffer will be resized if necessary to hold the full encoded mask.
+# If a NULL buffer pointer is given, a new buffer will be allocated with the
+# pointer value overwriting the NULL (hence NULL must not be passed as a
+# constant in the argument list).  The length of the encoded mask in words is
+# returned as the function value; this value will be less than BUFLEN is the
+# user supplied buffer is larger than it needs to be to store the mask, i.e.,
+# the user buffer is not resized or reallocated if it is large enough to store
+# the mask.  The existing contents of the buffer will be overwritten.  Multiple
+# calls may be made to checkpoint the mask, allowing rollback to an earlier
+# state.
+
+int procedure pl_save (pl, bp, buflen, flags)
+
+pointer	pl			#I mask descriptor
+pointer	bp			#U buffer pointer (to short), or NULL
+int	buflen			#U buffer length, shorts
+int	flags			#I not used at present
+
+pointer	sp, index, ex, op
+int	sz_index, n_buflen
+int	pl_p2li()
+pointer	coerce()
+errchk	malloc, realloc, pl_compress
+
+begin
+	call smark (sp)
+	call salloc (ex, LEN_PLEXTERN, TY_STRUCT)
+	call salloc (index, PL_NLP(pl) * 3 + LL_CURHDRLEN, TY_SHORT)
+
+	# Eliminate any wasted space in the mask, and compute the amount
+	# of space needed to store the compressed mask.  Compress the index
+	# first to eliminate wasted space; this can make a big difference
+	# for a sparse or empty mask.
+
+	call pl_compress (pl)
+	sz_index = pl_p2li (PL_LP(pl,1), 1, Mems[index], PL_NLP(pl))
+	#n_buflen = (LEN_PLEXTERN * SZ_STRUCT + PL_LLLEN(pl) * SZ_SHORT +
+	n_buflen = (LEN_PLEXTERN * SZ_MII_INT + PL_LLLEN(pl) * SZ_SHORT +
+	    sz_index * SZ_SHORT) / SZ_SHORT
+
+	# Allocate or resize the output buffer.
+	if (bp == NULL) {
+	    call malloc (bp, n_buflen, TY_SHORT)
+	    buflen = n_buflen
+	} else if (n_buflen > buflen) {
+	    call realloc (bp, n_buflen, TY_SHORT)
+	    buflen = n_buflen
+	}
+
+	# Encode and output the external format header structure.
+	call aclri (Memi[ex], LEN_PLEXTERN)
+
+	PLE_MAGIC(ex)	= PL_MAGIC(pl)
+	PLE_NAXES(ex)	= PL_NAXES(pl)
+	PLE_LLOP(ex)	= PL_LLOP(pl)
+	PLE_LLLEN(ex)	= PL_LLLEN(pl)
+	PLE_MAXLINE(ex) = PL_MAXLINE(pl)
+	PLE_MAXVAL(ex)  = PL_MAXVAL(pl)
+	PLE_NLP(ex)	= PL_NLP(pl)
+	PLE_NLPX(ex)	= sz_index
+	PLE_EXLEN(ex)	= n_buflen
+
+	op = bp
+	call amovl (PL_AXLEN(pl,1), PLE_AXLEN(ex,1), PL_MAXDIM)
+	call miipak32 (Memi[ex], Memi[coerce(op,TY_SHORT,TY_INT)],
+	    LEN_PLEXTERN, TY_STRUCT)
+	#op = op + (LEN_PLEXTERN * SZ_STRUCT) / SZ_SHORT
+	op = op + (LEN_PLEXTERN * SZ_MII_INT) / SZ_SHORT
+
+	# Append the compressed index...
+	call miipak16 (Mems[index], Mems[op], sz_index, TY_SHORT)
+	op = op + sz_index
+
+	# and the line list buffer.
+	call miipak16 (LL(pl,0), Mems[op], PL_LLLEN(pl), TY_SHORT)
+	op = op + PL_LLLEN(pl)
+
+	call sfree (sp)
+	return (op - bp)
+end