Index: trunk/src_3rd/libucdf/ucdf.c
===================================================================
--- trunk/src_3rd/libucdf/ucdf.c	(revision 35431)
+++ trunk/src_3rd/libucdf/ucdf.c	(revision 35432)
@@ -360,6 +360,27 @@
 	return res;
 }
 
+/* Set up the virtual long file that holds short sector data */
+static int ucdf_setup_ssd(ucdf_ctx_t *ctx)
+{
+	long id_per_sect = ctx->sect_size >> 2;
+
+	if (ctx->root->type != UCDF_DE_ROOT)
+		error(UCDF_ERR_BAD_DIRCHAIN);
+
+	strcpy(ctx->ssd_de.name, "__short_sector_data__");
+	ctx->ssd_de.type = UCDF_DE_FILE;
+	ctx->ssd_de.size = ctx->ssat_len * id_per_sect;
+	ctx->ssd_de.is_short = 0;
+	ctx->ssd_de.first = ctx->root->first;
+	ctx->ssd_de.parent = ctx->ssd_de.next = ctx->ssd_de.children = NULL;
+
+	ctx->ssd_f.ctx = ctx;
+	ctx->ssd_f.de = &ctx->ssd_de;
+	ctx->ssd_f.stream_offs = ctx->ssd_f.sect_id = ctx->ssd_f.sect_offs = 0;
+	return 0;
+}
+
 int ucdf_open(ucdf_ctx_t *ctx, const char *path)
 {
 	ctx->f = fopen(path, "rb");
@@ -377,6 +398,9 @@
 	if (ucdf_read_dirs(ctx) != 0)
 		goto error;
 
+	if (ucdf_setup_ssd(ctx) != 0)
+		goto error;
+
 	return 0;
 
 	error:;
Index: trunk/src_3rd/libucdf/ucdf.h
===================================================================
--- trunk/src_3rd/libucdf/ucdf.h	(revision 35431)
+++ trunk/src_3rd/libucdf/ucdf.h	(revision 35432)
@@ -78,6 +78,10 @@
 	long *msat;                /* the master SAT read into memory */
 	long *sat;                 /* the whole SAT assembled and read into memory; entries are indexed by sector ID and contain the next sector ID within the chain */
 	long *ssat;                /* the whole Short-SAT assembled and read into memory */
+
+	/* short sector data is really stored in a long stream; keep a file open on it */
+	ucdf_direntry_t ssd_de;
+	ucdf_file_t ssd_f;
 };