Merged core/ and stream/ -> src/. The split wasn't worth it.

1 files changed, 232 insertions, 0 deletions

diff --git a/src/upb_msg.h b/src/upb_msg.h
new file mode 100644
index 0000000..8a3c63f
--- /dev/null
+++ b/src/upb_msg.h
@@ -0,0 +1,232 @@
+/*
+ * upb - a minimalist implementation of protocol buffers.
+ *
+ * Copyright (c) 2010-2011 Joshua Haberman.  See LICENSE for details.
+ *
+ * Data structure for storing a message of protobuf data.  Unlike Google's
+ * protobuf, upb_msg and upb_array are reference counted instead of having
+ * exclusive ownership of their fields.  This is a better match for dynamic
+ * languages where statements like a.b = other_b are normal.
+ *
+ * upb's parsers and serializers could also be used to populate and serialize
+ * other kinds of message objects (even one generated by Google's protobuf).
+ */
+
+#ifndef UPB_MSG_H
+#define UPB_MSG_H
+
+#include "upb.h"
+#include "upb_def.h"
+#include <stdlib.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// A pointer to a .proto value.  The owner must have an out-of-band way of
+// knowing the type, so it knows which union member to use.
+typedef union {
+  double *_double;
+  float *_float;
+  int32_t *int32;
+  int64_t *int64;
+  uint8_t *uint8;
+  uint32_t *uint32;
+  uint64_t *uint64;
+  bool *_bool;
+  upb_string **str;
+  upb_msg **msg;
+  upb_array **arr;
+  void *_void;
+} upb_valueptr;
+
+INLINE upb_valueptr upb_value_addrof(upb_value *val) {
+  upb_valueptr ptr = {&val->val._double};
+  return ptr;
+}
+
+// Reads or writes a upb_value from an address represented by a upb_value_ptr.
+// We need to know the value type to perform this operation, because we need to
+// know how much memory to copy (and for big-endian machines, we need to know
+// where in the upb_value the data goes).
+//
+// For little endian-machines where we didn't mind overreading, we could make
+// upb_value_read simply use memcpy().
+INLINE upb_value upb_value_read(upb_valueptr ptr, upb_fieldtype_t ft) {
+  upb_value val;
+
+#ifdef NDEBUG
+#define CASE(t, member_name) \
+  case UPB_TYPE(t): val.val.member_name = *ptr.member_name; break;
+#else
+#define CASE(t, member_name) \
+  case UPB_TYPE(t): val.val.member_name = *ptr.member_name; val.type = upb_types[ft].inmemory_type; break;
+#endif
+
+  switch(ft) {
+    CASE(DOUBLE,   _double)
+    CASE(FLOAT,    _float)
+    CASE(INT32,    int32)
+    CASE(INT64,    int64)
+    CASE(UINT32,   uint32)
+    CASE(UINT64,   uint64)
+    CASE(SINT32,   int32)
+    CASE(SINT64,   int64)
+    CASE(FIXED32,  uint32)
+    CASE(FIXED64,  uint64)
+    CASE(SFIXED32, int32)
+    CASE(SFIXED64, int64)
+    CASE(BOOL,     _bool)
+    CASE(ENUM,     int32)
+    CASE(STRING,   str)
+    CASE(BYTES,    str)
+    CASE(MESSAGE,  msg)
+    CASE(GROUP,    msg)
+    case UPB_VALUETYPE_ARRAY:
+      val.val.arr = *ptr.arr;
+#ifndef NDEBUG
+      val.type = UPB_VALUETYPE_ARRAY;
+#endif
+      break;
+    default: assert(false);
+  }
+  return val;
+
+#undef CASE
+}
+
+INLINE void upb_value_write(upb_valueptr ptr, upb_value val,
+                            upb_fieldtype_t ft) {
+  if (ft == UPB_VALUETYPE_ARRAY) {
+    assert(val.type == UPB_VALUETYPE_ARRAY);
+  } else {
+    assert(val.type == upb_types[ft].inmemory_type);
+  }
+#define CASE(t, member_name) \
+  case UPB_TYPE(t): *ptr.member_name = val.val.member_name; break;
+
+  switch(ft) {
+    CASE(DOUBLE,   _double)
+    CASE(FLOAT,    _float)
+    CASE(INT32,    int32)
+    CASE(INT64,    int64)
+    CASE(UINT32,   uint32)
+    CASE(UINT64,   uint64)
+    CASE(SINT32,   int32)
+    CASE(SINT64,   int64)
+    CASE(FIXED32,  uint32)
+    CASE(FIXED64,  uint64)
+    CASE(SFIXED32, int32)
+    CASE(SFIXED64, int64)
+    CASE(BOOL,     _bool)
+    CASE(ENUM,     int32)
+    CASE(STRING,   str)
+    CASE(BYTES,    str)
+    CASE(MESSAGE,  msg)
+    CASE(GROUP,    msg)
+    case UPB_VALUETYPE_ARRAY:
+      *ptr.arr = val.val.arr;
+      break;
+    default: assert(false);
+  }
+
+#undef CASE
+}
+
+/* upb_array ******************************************************************/
+
+typedef uint32_t upb_arraylen_t;
+struct _upb_array {
+  upb_atomic_refcount_t refcount;
+  // "len" and "size" are measured in elements, not bytes.
+  upb_arraylen_t len;
+  upb_arraylen_t size;
+  char *ptr;
+};
+
+void _upb_array_free(upb_array *a, upb_fielddef *f);
+INLINE upb_valueptr _upb_array_getptr(upb_array *a, upb_fielddef *f,
+                                      uint32_t elem) {
+  upb_valueptr p;
+  p._void = &a->ptr[elem * upb_types[f->type].size];
+  return p;
+}
+
+upb_array *upb_array_new(void);
+
+INLINE void upb_array_unref(upb_array *a, upb_fielddef *f) {
+  if (a && upb_atomic_unref(&a->refcount)) _upb_array_free(a, f);
+}
+
+void upb_array_recycle(upb_array **arr, upb_fielddef *f);
+
+INLINE uint32_t upb_array_len(upb_array *a) {
+  return a->len;
+}
+
+INLINE upb_value upb_array_get(upb_array *arr, upb_fielddef *f,
+                               upb_arraylen_t i) {
+  assert(i < upb_array_len(arr));
+  return upb_value_read(_upb_array_getptr(arr, f, i), f->type);
+}
+
+/* upb_msg ********************************************************************/
+
+struct _upb_msg {
+  upb_atomic_refcount_t refcount;
+  uint8_t data[4];  // We allocate the appropriate amount per message.
+};
+
+void _upb_msg_free(upb_msg *msg, upb_msgdef *md);
+
+INLINE upb_valueptr _upb_msg_getptr(upb_msg *msg, upb_fielddef *f) {
+  upb_valueptr p;
+  p._void = &msg->data[f->byte_offset];
+  return p;
+}
+
+// Creates a new msg of the given type.
+upb_msg *upb_msg_new(upb_msgdef *md);
+
+// Unrefs the given message.
+INLINE void upb_msg_unref(upb_msg *msg, upb_msgdef *md) {
+  if (msg && upb_atomic_unref(&msg->refcount)) _upb_msg_free(msg, md);
+}
+
+void upb_msg_recycle(upb_msg **msg, upb_msgdef *msgdef);
+
+// Tests whether the given field is explicitly set, or whether it will return a
+// default.
+INLINE bool upb_msg_has(upb_msg *msg, upb_fielddef *f) {
+  return (msg->data[f->set_bit_offset] & f->set_bit_mask) != 0;
+}
+
+INLINE upb_value upb_msg_get(upb_msg *msg, upb_fielddef *f) {
+  return upb_value_read(_upb_msg_getptr(msg, f), upb_field_valuetype(f));
+}
+
+// Unsets all field values back to their defaults.
+INLINE void upb_msg_clear(upb_msg *msg, upb_msgdef *md) {
+  memset(msg->data, 0, md->set_flags_bytes);
+}
+
+typedef struct {
+  upb_msg *msg;
+  upb_msgdef *msgdef;
+} upb_msgpopulator_frame;
+
+typedef struct {
+  upb_msgpopulator_frame stack[UPB_MAX_NESTING], *top, *limit;
+  upb_status status;
+} upb_msgpopulator;
+
+void upb_msgpopulator_init(upb_msgpopulator *p);
+void upb_msgpopulator_uninit(upb_msgpopulator *p);
+void upb_msgpopulator_reset(upb_msgpopulator *p, upb_msg *m, upb_msgdef *md);
+void upb_msgpopulator_register_handlers(upb_msgpopulator *p, upb_handlers *h);
+
+#ifdef __cplusplus
+}  /* extern "C" */
+#endif
+
+#endif