--- /dev/null
+
+#include "upb/pb/varint.int.h"
+
+/* Index is descriptor type. */
+const uint8_t upb_pb_native_wire_types[] = {
+ UPB_WIRE_TYPE_END_GROUP, /* ENDGROUP */
+ UPB_WIRE_TYPE_64BIT, /* DOUBLE */
+ UPB_WIRE_TYPE_32BIT, /* FLOAT */
+ UPB_WIRE_TYPE_VARINT, /* INT64 */
+ UPB_WIRE_TYPE_VARINT, /* UINT64 */
+ UPB_WIRE_TYPE_VARINT, /* INT32 */
+ UPB_WIRE_TYPE_64BIT, /* FIXED64 */
+ UPB_WIRE_TYPE_32BIT, /* FIXED32 */
+ UPB_WIRE_TYPE_VARINT, /* BOOL */
+ UPB_WIRE_TYPE_DELIMITED, /* STRING */
+ UPB_WIRE_TYPE_START_GROUP, /* GROUP */
+ UPB_WIRE_TYPE_DELIMITED, /* MESSAGE */
+ UPB_WIRE_TYPE_DELIMITED, /* BYTES */
+ UPB_WIRE_TYPE_VARINT, /* UINT32 */
+ UPB_WIRE_TYPE_VARINT, /* ENUM */
+ UPB_WIRE_TYPE_32BIT, /* SFIXED32 */
+ UPB_WIRE_TYPE_64BIT, /* SFIXED64 */
+ UPB_WIRE_TYPE_VARINT, /* SINT32 */
+ UPB_WIRE_TYPE_VARINT, /* SINT64 */
+};
+
+/* A basic branch-based decoder, uses 32-bit values to get good performance
+ * on 32-bit architectures (but performs well on 64-bits also).
+ * This scheme comes from the original Google Protobuf implementation
+ * (proto2). */
+upb_decoderet upb_vdecode_max8_branch32(upb_decoderet r) {
+ upb_decoderet err = {NULL, 0};
+ const char *p = r.p;
+ uint32_t low = (uint32_t)r.val;
+ uint32_t high = 0;
+ uint32_t b;
+ b = *(p++); low |= (b & 0x7fU) << 14; if (!(b & 0x80)) goto done;
+ b = *(p++); low |= (b & 0x7fU) << 21; if (!(b & 0x80)) goto done;
+ b = *(p++); low |= (b & 0x7fU) << 28;
+ high = (b & 0x7fU) >> 4; if (!(b & 0x80)) goto done;
+ b = *(p++); high |= (b & 0x7fU) << 3; if (!(b & 0x80)) goto done;
+ b = *(p++); high |= (b & 0x7fU) << 10; if (!(b & 0x80)) goto done;
+ b = *(p++); high |= (b & 0x7fU) << 17; if (!(b & 0x80)) goto done;
+ b = *(p++); high |= (b & 0x7fU) << 24; if (!(b & 0x80)) goto done;
+ b = *(p++); high |= (b & 0x7fU) << 31; if (!(b & 0x80)) goto done;
+ return err;
+
+done:
+ r.val = ((uint64_t)high << 32) | low;
+ r.p = p;
+ return r;
+}
+
+/* Like the previous, but uses 64-bit values. */
+upb_decoderet upb_vdecode_max8_branch64(upb_decoderet r) {
+ const char *p = r.p;
+ uint64_t val = r.val;
+ uint64_t b;
+ upb_decoderet err = {NULL, 0};
+ b = *(p++); val |= (b & 0x7fU) << 14; if (!(b & 0x80)) goto done;
+ b = *(p++); val |= (b & 0x7fU) << 21; if (!(b & 0x80)) goto done;
+ b = *(p++); val |= (b & 0x7fU) << 28; if (!(b & 0x80)) goto done;
+ b = *(p++); val |= (b & 0x7fU) << 35; if (!(b & 0x80)) goto done;
+ b = *(p++); val |= (b & 0x7fU) << 42; if (!(b & 0x80)) goto done;
+ b = *(p++); val |= (b & 0x7fU) << 49; if (!(b & 0x80)) goto done;
+ b = *(p++); val |= (b & 0x7fU) << 56; if (!(b & 0x80)) goto done;
+ b = *(p++); val |= (b & 0x7fU) << 63; if (!(b & 0x80)) goto done;
+ return err;
+
+done:
+ r.val = val;
+ r.p = p;
+ return r;
+}