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-rw-r--r--pb_encode.c36
1 files changed, 31 insertions, 5 deletions
diff --git a/pb_encode.c b/pb_encode.c
index 30f60d8..05d691d 100644
--- a/pb_encode.c
+++ b/pb_encode.c
@@ -204,25 +204,51 @@ static bool checkreturn encode_array(pb_ostream_t *stream, const pb_field_t *fie
* This function implements the check for the zero value. */
static bool pb_check_proto3_default_value(const pb_field_t *field, const void *pData)
{
- if (PB_ATYPE(field->type) == PB_ATYPE_STATIC)
+ pb_type_t type = field->type;
+ const void *pSize = (const char*)pData + field->size_offset;
+
+ if (PB_HTYPE(type) == PB_HTYPE_REQUIRED)
+ {
+ /* Required proto2 fields inside proto3 submessage, pretty rare case */
+ return false;
+ }
+ else if (PB_HTYPE(type) == PB_HTYPE_REPEATED)
+ {
+ /* Repeated fields inside proto3 submessage: present if count != 0 */
+ return *(const pb_size_t*)pSize == 0;
+ }
+ else if (PB_HTYPE(type) == PB_HTYPE_ONEOF)
+ {
+ /* Oneof fields */
+ return *(const pb_size_t*)pSize == 0;
+ }
+ else if (PB_HTYPE(type) == PB_HTYPE_OPTIONAL && field->size_offset)
+ {
+ /* Proto2 optional fields inside proto3 submessage */
+ return *(const bool*)pSize == false;
+ }
+
+ /* Rest is proto3 singular fields */
+
+ if (PB_ATYPE(type) == PB_ATYPE_STATIC)
{
- if (PB_LTYPE(field->type) == PB_LTYPE_BYTES)
+ if (PB_LTYPE(type) == PB_LTYPE_BYTES)
{
const pb_bytes_array_t *bytes = (const pb_bytes_array_t*)pData;
return bytes->size == 0;
}
- else if (PB_LTYPE(field->type) == PB_LTYPE_STRING)
+ else if (PB_LTYPE(type) == PB_LTYPE_STRING)
{
return *(const char*)pData == '\0';
}
- else if (PB_LTYPE(field->type) == PB_LTYPE_FIXED_LENGTH_BYTES)
+ else if (PB_LTYPE(type) == PB_LTYPE_FIXED_LENGTH_BYTES)
{
/* Fixed length bytes is only empty if its length is fixed
* as 0. Which would be pretty strange, but we can check
* it anyway. */
return field->data_size == 0;
}
- else if (PB_LTYPE(field->type) == PB_LTYPE_SUBMESSAGE)
+ else if (PB_LTYPE(type) == PB_LTYPE_SUBMESSAGE)
{
/* Check all fields in the submessage to find if any of them
* are non-zero. The comparison cannot be done byte-per-byte