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diff --git a/upb_struct.h b/upb_struct.h
deleted file mode 100644
index 72a1d21..0000000
--- a/upb_struct.h
+++ /dev/null
@@ -1,214 +0,0 @@
-/*
- * upb - a minimalist implementation of protocol buffers.
- *
- * Copyright (c) 2009 Joshua Haberman.  See LICENSE for details.
- *
- * upb_struct defines an in-memory byte-level format for storing protobufs.  It
- * is very much like a C struct that you can define at run-time, but also
- * supports reflection.  Like C structs it supports offset-based access, as
- * opposed to the much slower name-based lookup.  The format represents both
- * the values themselves and bits describing whether each field is set or not.
- *
- * The upb compiler emits C structs that mimic this definition exactly, so that
- * you can access the same hunk of memory using either this run-time
- * reflection-supporting interface or a C struct that was generated by the upb
- * compiler.
- *
- * Like C structs the format depends on the endianness of the host machine, so
- * it is not suitable for exchanging across machines of differing endianness.
- * But there is no reason to do that -- the protobuf serialization format is
- * designed already for serialization/deserialization, and is more compact than
- * this format.  This format is designed to allow the fastest possible random
- * access of individual fields.
- *
- * Note that no memory management is defined, which should make it easier to
- * integrate this format with existing memory-management schemes.  Any memory
- * management semantics can be used with the format as defined here.
- */
-
-#ifndef PBSTRUCT_H_
-#define PBSTRUCT_H_
-
-#include "upb.h"
-#include <stdbool.h>
-#include <stddef.h>
-#include <stdint.h>
-#include <string.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/* Structure definition. ******************************************************/
-
-/* One single field of the struct. */
-struct upb_struct_field {
-  ptrdiff_t byte_offset;        /* Where to find the data. */
-  ptrdiff_t isset_byte_offset;  /* The byte where the "set" bit lives. */
-  uint8_t isset_byte_mask;
-};
-
-/* Definition of a complete struct. */
-struct upb_struct_definition {
-  size_t size;
-  int num_fields;
-  int set_flags_bytes;
-  int num_required_fields;  /* Required fields have the lowest set bytemasks. */
-  struct upb_struct_field fields[];
-};
-
-/* While these are written to be as fast as possible, it will still be faster
- * to cache the results of this lookup if possible.  These return NULL if no
- * such field is found. */
-struct upb_struct_field *upb_struct_find_field_by_name(
-  struct upb_struct_definition *d, char *name);
-struct upb_struct_field *upb_struct_find_field_by_number(
-  struct upb_struct_definition *d, uint32_t number);
-
-/* Variable-length data (strings and arrays).**********************************/
-
-/* Represents an array (a repeated field) of any type.  The interpretation of
- * the data in the array depends on the type. */
-struct upb_array {
-  void *data;  /* Size of individual elements is based on type. */
-  uint32_t len;     /* Measured in elements. */
-};
-
-/* A generic array of structs, using void* instead of specific types. */
-struct upb_struct_array {
-  void **elements;
-  uint32_t len;
-};
-
-/* An array of strings. */
-struct upb_string_array {
-  struct upb_string **elements;
-  uint32_t len;
-};
-
-/* Specific arrays of all the primitive types. */
-#define UPB_DEFINE_PRIMITIVE_ARRAY(type, name) \
-  struct upb_ ## name ## _array { \
-    size_t len; \
-    type *elements; \
-  };
-
-UPB_DEFINE_PRIMITIVE_ARRAY(double,   double)
-UPB_DEFINE_PRIMITIVE_ARRAY(float,    float)
-UPB_DEFINE_PRIMITIVE_ARRAY(int32_t,  int32)
-UPB_DEFINE_PRIMITIVE_ARRAY(int64_t,  int64)
-UPB_DEFINE_PRIMITIVE_ARRAY(uint32_t, uint32)
-UPB_DEFINE_PRIMITIVE_ARRAY(uint64_t, uint64)
-UPB_DEFINE_PRIMITIVE_ARRAY(bool,     bool)
-#undef UPB_DEFINE_PRMITIVE_ARRAY
-
-#define UPB_STRUCT_ARRAY(struct_type) struct struct_type ## _array
-
-#define UPB_DEFINE_STRUCT_ARRAY(struct_type) \
-  UPB_STRUCT_ARRAY(struct_type) { \
-    size_t len; \
-    struct_type **elements; \
-  };
-
-/* Accessors for primitive types.  ********************************************/
-
-/* For each primitive type we define a set of six functions:
- *
- *  // For fetching out of a struct (s points to the raw struct data).
- *  int32_t *upb_struct_get_int32_ptr(void *s, struct upb_struct_field *f);
- *  int32_t upb_struct_get_int32(void *s, struct upb_struct_field *f);
- *  void upb_struct_set_int32(void *s, struct upb_struct_field *f, int32_t val);
- *
- *  // For fetching out of an array.
- *  int32_t *upb_array_get_int32_ptr(struct upb_array *a, int n);
- *  int32_t upb_array_get_int32(struct upb_array *a, int n);
- *  void upb_array_set_int32(struct upb_array *a, int n, ctype val);
- *
- * For arrays we provide only the first three because protobufs do not support
- * arrays of arrays.
- *
- * These do no existence checks, bounds checks, or type checks. */
-
-#define UPB_DEFINE_ACCESSORS(ctype, name, INLINE) \
-  INLINE ctype *upb_struct_get_ ## name ## _ptr( \
-      void *s, struct upb_struct_field *f) { \
-    return (ctype*)((char*)s + f->byte_offset); \
-  } \
-  INLINE ctype upb_struct_get_ ## name( \
-      void *s, struct upb_struct_field *f) { \
-    return *upb_struct_get_ ## name ## _ptr(s, f); \
-  } \
-  INLINE void upb_struct_set_ ## name( \
-      void *s, struct upb_struct_field *f, ctype val) { \
-    *upb_struct_get_ ## name ## _ptr(s, f) = val; \
-  }
-
-#define UPB_DEFINE_ARRAY_ACCESSORS(ctype, name, INLINE) \
-  INLINE ctype *upb_array_get_ ## name ## _ptr(struct upb_array *a, int n) { \
-    return ((ctype*)a->data) + n; \
-  } \
-  INLINE ctype upb_array_get_ ## name(struct upb_array *a, int n) { \
-    return *upb_array_get_ ## name ## _ptr(a, n); \
-  } \
-  INLINE void upb_array_set_ ## name(struct upb_array *a, int n, ctype val) { \
-    *upb_array_get_ ## name ## _ptr(a, n) = val; \
-  }
-
-#define UPB_DEFINE_ALL_ACCESSORS(ctype, name, INLINE) \
-  UPB_DEFINE_ACCESSORS(ctype, name, INLINE) \
-  UPB_DEFINE_ARRAY_ACCESSORS(ctype, name, INLINE)
-
-UPB_DEFINE_ALL_ACCESSORS(double,   double, INLINE)
-UPB_DEFINE_ALL_ACCESSORS(float,    float,  INLINE)
-UPB_DEFINE_ALL_ACCESSORS(int32_t,  int32,  INLINE)
-UPB_DEFINE_ALL_ACCESSORS(int64_t,  int64,  INLINE)
-UPB_DEFINE_ALL_ACCESSORS(uint32_t, uint32, INLINE)
-UPB_DEFINE_ALL_ACCESSORS(uint64_t, uint64, INLINE)
-UPB_DEFINE_ALL_ACCESSORS(bool,     bool,   INLINE)
-UPB_DEFINE_ALL_ACCESSORS(struct upb_struct_delimited*, bytes, INLINE)
-UPB_DEFINE_ALL_ACCESSORS(struct upb_struct_delimited*, string, INLINE)
-UPB_DEFINE_ALL_ACCESSORS(void*, substruct, INLINE)
-UPB_DEFINE_ACCESSORS(struct upb_array*, array, INLINE)
-
-/* Functions for reading and writing the "set" flags in the pbstruct.  Note
- * that these do not perform any memory management associated with any dynamic
- * memory these fields may be referencing; that is the client's responsibility.
- * These *only* set and test the flags. */
-INLINE void upb_struct_set(void *s, struct upb_struct_field *f)
-{
-  ((char*)s)[f->isset_byte_offset] |= f->isset_byte_mask;
-}
-
-INLINE void upb_struct_unset(void *s, struct upb_struct_field *f)
-{
-  ((char*)s)[f->isset_byte_offset] &= ~f->isset_byte_mask;
-}
-
-INLINE bool upb_struct_is_set(void *s, struct upb_struct_field *f)
-{
-  return ((char*)s)[f->isset_byte_offset] & f->isset_byte_mask;
-}
-
-INLINE bool upb_struct_all_required_fields_set(
-    void *s, struct upb_struct_definition *d)
-{
-  int num_fields = d->num_required_fields;
-  int i = 0;
-  while(num_fields > 8) {
-    if(((uint8_t*)s)[i++] != 0xFF) return false;
-    num_fields -= 8;
-  }
-  if(((uint8_t*)s)[i] != (1 << num_fields) - 1) return false;
-  return true;
-}
-
-INLINE void upb_struct_clear(void *s, struct upb_struct_definition *d)
-{
-  memset(s, 0, d->set_flags_bytes);
-}
-
-#ifdef __cplusplus
-}  /* extern "C" */
-#endif
-
-#endif  /* PBSTRUCT_H_ */