From 76c334dce6bd863b847882a9581b1fdba67d2b68 Mon Sep 17 00:00:00 2001
From: "Brett V. Forsgren" <brett.forsgren@outlook.com>
Date: Mon, 12 Jul 2021 10:48:32 -0600
Subject: [PATCH] default to a nil UUID if the supplied value can't be parsed

Fixes #21.
---
 spec/HeaderVariablesSpec.xml |  4 ++--
 src/helper_functions.rs      | 15 ++++++++++-----
 2 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/spec/HeaderVariablesSpec.xml b/spec/HeaderVariablesSpec.xml
index 2be0f12..6932c73 100644
--- a/spec/HeaderVariablesSpec.xml
+++ b/spec/HeaderVariablesSpec.xml
@@ -237,8 +237,8 @@
   <Variable Name="CEPSNID" Code="390" Type="Handle" Field="new_object_plot_style_handle" DefaultValue="Handle::empty()" ReaderOverride="pair.as_handle()?" WriteConverter="&amp;{}.as_string()" MinVersion="R2000" DontWriteDefault="true" Comment="PlotStyle handle of new objects." />
   <Variable Name="CEPSNTYPE" Code="380" Type="PlotStyle" Field="new_object_plot_style" DefaultValue="PlotStyle::ByLayer" ReadConverter="enum_from_number!(PlotStyle, ByLayer, from_i16, {})" WriteConverter="{} as i16" MinVersion="R2000" Comment="Plot style of new objects." />
   <Variable Name="PSTYLEMODE" Code="290" Type="bool" Field="uses_color_dependent_plot_style_tables" DefaultValue="true" MinVersion="R2000" Comment="Indicates whether the current drawing is in a Color-Dependent or Named Plot Style mode." />
-  <Variable Name="FINGERPRINTGUID" Code="2" Type="Uuid" Field="fingerprint_guid" DefaultValue="Uuid::new_v4()" ReadConverter="as_uuid({}, pair.offset)?" WriteConverter="&amp;uuid_string(&amp;{})" MinVersion="R2000" Comment="Set at creation time, uniquely identifies a particular drawing." />
-  <Variable Name="VERSIONGUID" Code="2" Type="Uuid" Field="version_guid" DefaultValue="Uuid::new_v4()" ReadConverter="as_uuid({}, pair.offset)?" WriteConverter="&amp;uuid_string(&amp;{})" MinVersion="R2000" Comment="Uniquely identifies a particular version of a drawing.  Updated when the drawing is modified." />
+  <Variable Name="FINGERPRINTGUID" Code="2" Type="Uuid" Field="fingerprint_guid" DefaultValue="Uuid::new_v4()" ReadConverter="as_uuid({})" WriteConverter="&amp;uuid_string(&amp;{})" MinVersion="R2000" Comment="Set at creation time, uniquely identifies a particular drawing." />
+  <Variable Name="VERSIONGUID" Code="2" Type="Uuid" Field="version_guid" DefaultValue="Uuid::new_v4()" ReadConverter="as_uuid({})" WriteConverter="&amp;uuid_string(&amp;{})" MinVersion="R2000" Comment="Uniquely identifies a particular version of a drawing.  Updated when the drawing is modified." />
   <Variable Name="EXTNAMES" Code="290" Type="bool" Field="use_acad2000_symbol_table_naming" DefaultValue="true" MinVersion="R2000" Comment="Controls symbol table naming." />
   <Variable Name="PSVPSCALE" Code="40" Type="f64" Field="viewport_view_scale_factor" DefaultValue="0.0" MinVersion="R2000" Comment="View scale factor for new viewports." />
   <Variable Name="OLESTARTUP" Code="290" Type="bool" Field="ole_startup" DefaultValue="false" MinVersion="R2000" Comment="Controls whether the source application of an embedded OLE object loads when plotting." />
diff --git a/src/helper_functions.rs b/src/helper_functions.rs
index 13983f4..065171f 100644
--- a/src/helper_functions.rs
+++ b/src/helper_functions.rs
@@ -115,7 +115,7 @@ pub(crate) fn as_duration(d: f64) -> StdDuration {
     StdDuration::from_secs(d as u64)
 }
 
-pub(crate) fn as_uuid(s: String, offset: usize) -> DxfResult<Uuid> {
+pub(crate) fn as_uuid(s: String) -> Uuid {
     let mut reconstructed = String::new();
     let s = if s.starts_with('{') && s.ends_with('}') {
         // reconstruct the string without the braces
@@ -128,15 +128,20 @@ pub(crate) fn as_uuid(s: String, offset: usize) -> DxfResult<Uuid> {
         s.as_str()
     };
     match Uuid::parse_str(s) {
-        Ok(uuid) => Ok(uuid),
-        Err(_) => Err(DxfError::ParseError(offset)),
+        Ok(uuid) => uuid,
+        Err(_) => Uuid::nil(),
     }
 }
 
 #[test]
 fn parse_regular_and_windows_style_uuids_test() {
-    let _regular = as_uuid(String::from("a2a7a23e-975b-4b54-968c-150d4c32a9b6"), 0).unwrap();
-    let _windows = as_uuid(String::from("{a2a7a23e-975b-4b54-968c-150d4c32a9b6}"), 0).unwrap();
+    let _regular = as_uuid(String::from("a2a7a23e-975b-4b54-968c-150d4c32a9b6"));
+    let _windows = as_uuid(String::from("{a2a7a23e-975b-4b54-968c-150d4c32a9b6}"));
+}
+
+#[test]
+fn parse_empty_uuid_test() {
+    let _empty = as_uuid(String::from(""));
 }
 
 pub(crate) fn as_i16(b: bool) -> i16 {