create wire/ subdir for all wire-format code

PiperOrigin-RevId: 485898080

upb/decode_fast.h

diff --git a/upb/decode_fast.h b/upb/decode_fast.h
index 7803367..04a66fb 100644
--- a/upb/decode_fast.h
+++ b/upb/decode_fast.h
@@ -25,143 +25,11 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-// These are the specialized field parser functions for the fast parser.
-// Generated tables will refer to these by name.
-//
-// The function names are encoded with names like:
-//
-//   //  123 4
-//   upb_pss_1bt();   // Parse singular string, 1 byte tag.
-//
-// In position 1:
-//   - 'p' for parse, most function use this
-//   - 'c' for copy, for when we are copying strings instead of aliasing
-//
-// In position 2 (cardinality):
-//   - 's' for singular, with or without hasbit
-//   - 'o' for oneof
-//   - 'r' for non-packed repeated
-//   - 'p' for packed repeated
-//
-// In position 3 (type):
-//   - 'b1' for bool
-//   - 'v4' for 4-byte varint
-//   - 'v8' for 8-byte varint
-//   - 'z4' for zig-zag-encoded 4-byte varint
-//   - 'z8' for zig-zag-encoded 8-byte varint
-//   - 'f4' for 4-byte fixed
-//   - 'f8' for 8-byte fixed
-//   - 'm' for sub-message
-//   - 's' for string (validate UTF-8)
-//   - 'b' for bytes
-//
-// In position 4 (tag length):
-//   - '1' for one-byte tags (field numbers 1-15)
-//   - '2' for two-byte tags (field numbers 16-2048)
+// This header is deprecated, use upb/wire/decode_fast.h instead
 
 #ifndef UPB_DECODE_FAST_H_
 #define UPB_DECODE_FAST_H_
 
-#include "upb/msg.h"
-
-// Must be last.
-#include "upb/port_def.inc"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-struct upb_Decoder;
-
-// The fallback, generic parsing function that can handle any field type.
-// This just uses the regular (non-fast) parser to parse a single field.
-const char* _upb_FastDecoder_DecodeGeneric(struct upb_Decoder* d,
-                                           const char* ptr, upb_Message* msg,
-                                           intptr_t table, uint64_t hasbits,
-                                           uint64_t data);
-
-#define UPB_PARSE_PARAMS                                                    \
-  struct upb_Decoder *d, const char *ptr, upb_Message *msg, intptr_t table, \
-      uint64_t hasbits, uint64_t data
-
-/* primitive fields ***********************************************************/
-
-#define F(card, type, valbytes, tagbytes) \
-  const char* upb_p##card##type##valbytes##_##tagbytes##bt(UPB_PARSE_PARAMS);
-
-#define TYPES(card, tagbytes) \
-  F(card, b, 1, tagbytes)     \
-  F(card, v, 4, tagbytes)     \
-  F(card, v, 8, tagbytes)     \
-  F(card, z, 4, tagbytes)     \
-  F(card, z, 8, tagbytes)     \
-  F(card, f, 4, tagbytes)     \
-  F(card, f, 8, tagbytes)
-
-#define TAGBYTES(card) \
-  TYPES(card, 1)       \
-  TYPES(card, 2)
-
-TAGBYTES(s)
-TAGBYTES(o)
-TAGBYTES(r)
-TAGBYTES(p)
-
-#undef F
-#undef TYPES
-#undef TAGBYTES
-
-/* string fields **************************************************************/
-
-#define F(card, tagbytes, type)                                     \
-  const char* upb_p##card##type##_##tagbytes##bt(UPB_PARSE_PARAMS); \
-  const char* upb_c##card##type##_##tagbytes##bt(UPB_PARSE_PARAMS);
-
-#define UTF8(card, tagbytes) \
-  F(card, tagbytes, s)       \
-  F(card, tagbytes, b)
-
-#define TAGBYTES(card) \
-  UTF8(card, 1)        \
-  UTF8(card, 2)
-
-TAGBYTES(s)
-TAGBYTES(o)
-TAGBYTES(r)
-
-#undef F
-#undef TAGBYTES
-
-/* sub-message fields *********************************************************/
-
-#define F(card, tagbytes, size_ceil, ceil_arg) \
-  const char* upb_p##card##m_##tagbytes##bt_max##size_ceil##b(UPB_PARSE_PARAMS);
-
-#define SIZES(card, tagbytes) \
-  F(card, tagbytes, 64, 64)   \
-  F(card, tagbytes, 128, 128) \
-  F(card, tagbytes, 192, 192) \
-  F(card, tagbytes, 256, 256) \
-  F(card, tagbytes, max, -1)
-
-#define TAGBYTES(card) \
-  SIZES(card, 1)       \
-  SIZES(card, 2)
-
-TAGBYTES(s)
-TAGBYTES(o)
-TAGBYTES(r)
-
-#undef TAGBYTES
-#undef SIZES
-#undef F
-
-#undef UPB_PARSE_PARAMS
-
-#ifdef __cplusplus
-} /* extern "C" */
-#endif
-
-#include "upb/port_undef.inc"
+#include "upb/wire/decode_fast.h"
 
 #endif /* UPB_DECODE_FAST_H_ */