protobuf-c.c: fix packed repeated bool parsing

From https://developers.google.com/protocol-buffers/docs/proto3#updating:
  int32, uint32, int64, uint64, and bool are all compatible – this means
  you can change a field from one of these types to another without
  breaking forwards- or backwards-compatibility. If a number is parsed
  from the wire which doesn't fit in the corresponding type, you will
  get the same effect as if you had cast the number to that type in C++
  (e.g. if a 64-bit number is read as an int32, it will be truncated to
  32 bits).

Until this fix, protobuf-c did not conform to the rule above when it
came to deserializing non-boolean packed repeated data into a
protobuf_c_boolean array. Fully scan the varint and use parse_boolean to
truncate the resulting value.

Fixes #440

Makefile.am

@@ -274,6 +274,22 @@ BUILT_SOURCES += \
 	t/issue389/issue389.pb-c.c t/issue389/issue389.pb-c.h
 EXTRA_DIST += \
 	t/issue389/issue389.proto
+
+check_PROGRAMS += \
+	t/issue440/issue440
+TESTS += \
+	t/issue440/issue440
+t_issue440_issue440_SOURCES = \
+	t/issue440/issue440.c \
+	t/issue440/issue440.pb-c.c
+t_issue440_issue440_LDADD = \
+	protobuf-c/libprotobuf-c.la
+t/issue440/issue440.pb-c.c t/issue440/issue440.pb-c.h: $(top_builddir)/protoc-c/protoc-gen-c$(EXEEXT) $(top_srcdir)/t/issue440/issue440.proto
+	$(AM_V_GEN)@PROTOC@ --plugin=protoc-gen-c=$(top_builddir)/protoc-c/protoc-gen-c$(EXEEXT) -I$(top_srcdir) --c_out=$(top_builddir) $(top_srcdir)/t/issue440/issue440.proto
+BUILT_SOURCES += \
+	t/issue440/issue440.pb-c.c t/issue440/issue440.pb-c.h
+EXTRA_DIST += \
+	t/issue440/issue440.proto
 endif # BUILD_PROTO3
 EXTRA_DIST += \
 	t/issue330/issue330.proto

protobuf-c/protobuf-c.c

@@ -2748,7 +2748,9 @@ parse_packed_repeated_member(ScannedMember *scanned_member,
 	const uint8_t *at = scanned_member->data + scanned_member->length_prefix_len;
 	size_t rem = scanned_member->len - scanned_member->length_prefix_len;
 	size_t count = 0;
+#if defined(WORDS_BIGENDIAN)
 	unsigned i;
+#endif
 
 	switch (field->type) {
 	case PROTOBUF_C_TYPE_SFIXED32:
@@ -2841,13 +2843,15 @@ parse_packed_repeated_member(ScannedMember *scanned_member,
 		}
 		break;
 	case PROTOBUF_C_TYPE_BOOL:
-		count = rem;
-		for (i = 0; i < count; i++) {
-			if (at[i] > 1) {
+		while (rem > 0) {
+			unsigned s = scan_varint(rem, at);
+			if (s == 0) {
 				PROTOBUF_C_UNPACK_ERROR("bad packed-repeated boolean value");
 				return FALSE;
 			}
-			((protobuf_c_boolean *) array)[i] = at[i];
+			((protobuf_c_boolean *) array)[count++] = parse_boolean(s, at);
+			at += s;
+			rem -= s;
 		}
 		break;
 	default:

t/issue440/.gitignore

@@ -0,0 +1 @@
+issue440

t/issue440/issue440.c

@@ -0,0 +1,30 @@
+#include <stdlib.h>
+#include <string.h>
+
+#include "t/issue440/issue440.pb-c.h"
+
+int main(void)
+{
+	/* Output of $ echo "int: 1 int: -142342 int: 0 int: 423423222" | \
+	 * protoc issue440.proto --encode=Int | xxd -i:
+	 * 0x0a, 0x11, 0x01, 0xfa, 0xa7, 0xf7, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	 * 0x01, 0x00, 0xf6, 0xd9, 0xf3, 0xc9, 0x01
+	 *
+	 * Output of $ echo "int: 1 int: -142342 int: 0 int: 423423222" | \
+	 * protoc issue440.proto --encode=Int | protoc issue440.proto \
+	 * --decode=Boolean: boolean: true boolean: true boolean: false boolean: true
+	 */
+	uint8_t protoc[] = {0x0a, 0x11, 0x01, 0xfa, 0xa7, 0xf7, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff, 0x01, 0x00, 0xf6, 0xd9, 0xf3, 0xc9,
+		0x01};
+	Boolean *msg = boolean__unpack (NULL, sizeof protoc, protoc);
+	assert(msg);
+	assert(msg->n_boolean == 4);
+	assert(msg->boolean[0] == 1);
+	assert(msg->boolean[1] == 1);
+	assert(msg->boolean[2] == 0);
+	assert(msg->boolean[3] == 1);
+	boolean__free_unpacked (msg, NULL);
+
+	return EXIT_SUCCESS;
+}

t/issue440/issue440.proto

@@ -0,0 +1,9 @@
+syntax = "proto3";
+
+message Int {
+	repeated int32 int = 1;
+}
+
+message Boolean {
+	repeated bool boolean = 1;
+}