+/* Field encoders */
+
+static bool checkreturn pb_enc_varint(pb_ostream_t *stream, const pb_field_t *field, const void *src)
+{
+ int64_t value = 0;
+
+ /* Cases 1 and 2 are for compilers that have smaller types for bool
+ * or enums, and for int_size option. */
+ switch (field->data_size)
+ {
+ case 1: value = *(const int8_t*)src; break;
+ case 2: value = *(const int16_t*)src; break;
+ case 4: value = *(const int32_t*)src; break;
+ case 8: value = *(const int64_t*)src; break;
+ default: PB_RETURN_ERROR(stream, "invalid data_size");
+ }
+
+ return pb_encode_varint(stream, (uint64_t)value);
+}
+
+static bool checkreturn pb_enc_uvarint(pb_ostream_t *stream, const pb_field_t *field, const void *src)
+{
+ uint64_t value = 0;
+
+ switch (field->data_size)
+ {
+ case 1: value = *(const uint8_t*)src; break;
+ case 2: value = *(const uint16_t*)src; break;
+ case 4: value = *(const uint32_t*)src; break;
+ case 8: value = *(const uint64_t*)src; break;
+ default: PB_RETURN_ERROR(stream, "invalid data_size");
+ }
+
+ return pb_encode_varint(stream, value);
+}
+
+static bool checkreturn pb_enc_svarint(pb_ostream_t *stream, const pb_field_t *field, const void *src)
+{
+ int64_t value = 0;
+
+ switch (field->data_size)
+ {
+ case 1: value = *(const int8_t*)src; break;
+ case 2: value = *(const int16_t*)src; break;
+ case 4: value = *(const int32_t*)src; break;
+ case 8: value = *(const int64_t*)src; break;
+ default: PB_RETURN_ERROR(stream, "invalid data_size");
+ }
+
+ return pb_encode_svarint(stream, value);
+}
+
+static bool checkreturn pb_enc_fixed64(pb_ostream_t *stream, const pb_field_t *field, const void *src)
+{
+ PB_UNUSED(field);
+ return pb_encode_fixed64(stream, src);
+}
+
+static bool checkreturn pb_enc_fixed32(pb_ostream_t *stream, const pb_field_t *field, const void *src)
+{
+ PB_UNUSED(field);
+ return pb_encode_fixed32(stream, src);
+}
+
+static bool checkreturn pb_enc_bytes(pb_ostream_t *stream, const pb_field_t *field, const void *src)
+{
+ const pb_bytes_array_t *bytes = (const pb_bytes_array_t*)src;
+
+ if (src == NULL)
+ {
+ /* Threat null pointer as an empty bytes field */
+ return pb_encode_string(stream, NULL, 0);
+ }
+
+ if (PB_ATYPE(field->type) == PB_ATYPE_STATIC &&
+ PB_BYTES_ARRAY_T_ALLOCSIZE(bytes->size) > field->data_size)
+ {
+ PB_RETURN_ERROR(stream, "bytes size exceeded");
+ }
+
+ return pb_encode_string(stream, bytes->bytes, bytes->size);
+}
+
+static bool checkreturn pb_enc_string(pb_ostream_t *stream, const pb_field_t *field, const void *src)
+{
+ size_t size = 0;
+ size_t max_size = field->data_size;
+ const char *p = (const char*)src;
+
+ if (PB_ATYPE(field->type) == PB_ATYPE_POINTER)
+ max_size = (size_t)-1;
+
+ if (src == NULL)
+ {
+ size = 0; /* Threat null pointer as an empty string */
+ }
+ else
+ {
+ /* strnlen() is not always available, so just use a loop */
+ while (size < max_size && *p != '\0')
+ {
+ size++;
+ p++;
+ }
+ }
+
+ return pb_encode_string(stream, (const uint8_t*)src, size);
+}
+
+static bool checkreturn pb_enc_submessage(pb_ostream_t *stream, const pb_field_t *field, const void *src)
+{
+ if (field->ptr == NULL)
+ PB_RETURN_ERROR(stream, "invalid field descriptor");
+
+ return pb_encode_submessage(stream, (const pb_field_t*)field->ptr, src);
+}
+