Fix EOF and null byte handling

This is a bit questionable, but the null byte support is needed for streaming
over a socket where some delimiter is required.  This caused a bug where serdi
would hang forever on corrupt files that contain a null byte.

Fix this by consuming the byte, but otherwise behaving as before.

3 files changed, 12 insertions, 3 deletions

diff --git a/src/n3.c b/src/n3.c
index fad12070..906a0ac4 100644
--- a/src/n3.c
+++ b/src/n3.c
@@ -1063,7 +1063,7 @@ read_object(SerdReader* reader, ReadContext* ctx, bool emit, bool* ate_dot)
 		}
 	}
 	switch (c) {
-	case EOF: case '\0': case ')':
+	case EOF: case ')':
 		return r_err(reader, SERD_ERR_BAD_SYNTAX, "expected object\n");
 	case '[':
 		simple = false;
@@ -1166,7 +1166,7 @@ read_predicateObjectList(SerdReader* reader, ReadContext ctx, bool* ate_dot)
 		do {
 			read_ws_star(reader);
 			switch (c = peek_byte(reader)) {
-			case EOF: case '\0':
+			case EOF:
 				return r_err(reader, SERD_ERR_BAD_SYNTAX,
 				             "unexpected end of file\n");
 			case '.': case ']': case '}':
@@ -1471,7 +1471,10 @@ read_n3_statement(SerdReader* reader)
 	SerdStatus         st      = SERD_SUCCESS;
 	read_ws_star(reader);
 	switch (peek_byte(reader)) {
-	case EOF: case '\0':
+	case '\0':
+		eat_byte_safe(reader, '\0');
+		return SERD_FAILURE;
+	case EOF:
 		return SERD_FAILURE;
 	case '@':
 		if (!fancy_syntax(reader)) {
diff --git a/tests/bad/bad-null-byte.ttl b/tests/bad/bad-null-byte.ttl
new file mode 100644
index 00000000..4f2cb404
--- /dev/null
+++ b/tests/bad/bad-null-byte.ttl
diff --git a/tests/bad/manifest.ttl b/tests/bad/manifest.ttl
index 57fb02f7..2c103a84 100644
--- a/tests/bad/manifest.ttl
+++ b/tests/bad/manifest.ttl
@@ -59,6 +59,7 @@
 		<#bad-misspelled-prefix>
 		<#bad-namespace>
 		<#bad-ns>
+		<#bad-null-byte>
 		<#bad-num>
 		<#bad-object2>
 		<#bad-object>
@@ -337,6 +338,11 @@
 	mf:name "bad-ns" ;
 	mf:action <bad-ns.ttl> .
 
+<#bad-null-byte>
+	rdf:type rdft:TestTurtleNegativeSyntax ;
+	mf:name "bad-null-byte" ;
+	mf:action <bad-null-byte.ttl> .
+
 <#bad-num>
 	rdf:type rdft:TestTurtleNegativeSyntax ;
 	mf:name "bad-num" ;