Protocol Buffers - Google's data interchange format (grpc依赖) https://developers.google.com/protocol-buffers/
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/*
* Copyright (c) 2009-2021, Google LLC
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Google LLC nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL Google LLC BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "upb/reflection/message.h"
#include <string.h>
#include "upb/internal/table.h"
#include "upb/map.h"
#include "upb/msg.h"
#include "upb/reflection/def_builder.h"
#include "upb/reflection/def_pool.h"
#include "upb/reflection/def_type.h"
#include "upb/reflection/field_def.h"
#include "upb/reflection/message_def.h"
#include "upb/reflection/oneof_def.h"
// Must be last.
#include "upb/port_def.inc"
static size_t get_field_size(const upb_MiniTable_Field* f) {
static unsigned char sizes[] = {
0, /* 0 */
8, /* kUpb_FieldType_Double */
4, /* kUpb_FieldType_Float */
8, /* kUpb_FieldType_Int64 */
8, /* kUpb_FieldType_UInt64 */
4, /* kUpb_FieldType_Int32 */
8, /* kUpb_FieldType_Fixed64 */
4, /* kUpb_FieldType_Fixed32 */
1, /* kUpb_FieldType_Bool */
sizeof(upb_StringView), /* kUpb_FieldType_String */
sizeof(void*), /* kUpb_FieldType_Group */
sizeof(void*), /* kUpb_FieldType_Message */
sizeof(upb_StringView), /* kUpb_FieldType_Bytes */
4, /* kUpb_FieldType_UInt32 */
4, /* kUpb_FieldType_Enum */
4, /* kUpb_FieldType_SFixed32 */
8, /* kUpb_FieldType_SFixed64 */
4, /* kUpb_FieldType_SInt32 */
8, /* kUpb_FieldType_SInt64 */
};
return upb_IsRepeatedOrMap(f) ? sizeof(void*) : sizes[f->descriptortype];
}
upb_Message* upb_Message_New(const upb_MessageDef* m, upb_Arena* a) {
return _upb_Message_New(upb_MessageDef_MiniTable(m), a);
}
static bool in_oneof(const upb_MiniTable_Field* field) {
return field->presence < 0;
}
static upb_MessageValue _upb_Message_Getraw(const upb_Message* msg,
const upb_FieldDef* f) {
const upb_MiniTable_Field* field = upb_FieldDef_MiniTable(f);
const char* mem = UPB_PTR_AT(msg, field->offset, char);
upb_MessageValue val = {0};
memcpy(&val, mem, get_field_size(field));
return val;
}
bool upb_Message_Has(const upb_Message* msg, const upb_FieldDef* f) {
assert(upb_FieldDef_HasPresence(f));
if (upb_FieldDef_IsExtension(f)) {
const upb_MiniTable_Extension* ext = _upb_FieldDef_ExtensionMiniTable(f);
return _upb_Message_Getext(msg, ext) != NULL;
} else {
const upb_MiniTable_Field* field = upb_FieldDef_MiniTable(f);
if (in_oneof(field)) {
return _upb_getoneofcase_field(msg, field) == field->number;
} else if (field->presence > 0) {
return _upb_hasbit_field(msg, field);
} else {
UPB_ASSERT(field->descriptortype == kUpb_FieldType_Message ||
field->descriptortype == kUpb_FieldType_Group);
return _upb_Message_Getraw(msg, f).msg_val != NULL;
}
}
}
const upb_FieldDef* upb_Message_WhichOneof(const upb_Message* msg,
const upb_OneofDef* o) {
const upb_FieldDef* f = upb_OneofDef_Field(o, 0);
if (upb_OneofDef_IsSynthetic(o)) {
UPB_ASSERT(upb_OneofDef_FieldCount(o) == 1);
return upb_Message_Has(msg, f) ? f : NULL;
} else {
const upb_MiniTable_Field* field = upb_FieldDef_MiniTable(f);
uint32_t oneof_case = _upb_getoneofcase_field(msg, field);
f = oneof_case ? upb_OneofDef_LookupNumber(o, oneof_case) : NULL;
UPB_ASSERT((f != NULL) == (oneof_case != 0));
return f;
}
}
upb_MessageValue upb_Message_Get(const upb_Message* msg,
const upb_FieldDef* f) {
if (upb_FieldDef_IsExtension(f)) {
const upb_Message_Extension* ext =
_upb_Message_Getext(msg, _upb_FieldDef_ExtensionMiniTable(f));
if (ext) {
upb_MessageValue val;
memcpy(&val, &ext->data, sizeof(val));
return val;
} else if (upb_FieldDef_IsRepeated(f)) {
return (upb_MessageValue){.array_val = NULL};
}
} else if (!upb_FieldDef_HasPresence(f) || upb_Message_Has(msg, f)) {
return _upb_Message_Getraw(msg, f);
}
return upb_FieldDef_Default(f);
}
upb_MutableMessageValue upb_Message_Mutable(upb_Message* msg,
const upb_FieldDef* f,
upb_Arena* a) {
UPB_ASSERT(upb_FieldDef_IsSubMessage(f) || upb_FieldDef_IsRepeated(f));
if (upb_FieldDef_HasPresence(f) && !upb_Message_Has(msg, f)) {
// We need to skip the upb_Message_Get() call in this case.
goto make;
}
upb_MessageValue val = upb_Message_Get(msg, f);
if (val.array_val) {
return (upb_MutableMessageValue){.array = (upb_Array*)val.array_val};
}
upb_MutableMessageValue ret;
make:
if (!a) return (upb_MutableMessageValue){.array = NULL};
if (upb_FieldDef_IsMap(f)) {
const upb_MessageDef* entry = upb_FieldDef_MessageSubDef(f);
const upb_FieldDef* key =
upb_MessageDef_FindFieldByNumber(entry, kUpb_MapEntry_KeyFieldNumber);
const upb_FieldDef* value =
upb_MessageDef_FindFieldByNumber(entry, kUpb_MapEntry_ValueFieldNumber);
ret.map =
upb_Map_New(a, upb_FieldDef_CType(key), upb_FieldDef_CType(value));
} else if (upb_FieldDef_IsRepeated(f)) {
ret.array = upb_Array_New(a, upb_FieldDef_CType(f));
} else {
UPB_ASSERT(upb_FieldDef_IsSubMessage(f));
ret.msg = upb_Message_New(upb_FieldDef_MessageSubDef(f), a);
}
val.array_val = ret.array;
upb_Message_Set(msg, f, val, a);
return ret;
}
bool upb_Message_Set(upb_Message* msg, const upb_FieldDef* f,
upb_MessageValue val, upb_Arena* a) {
if (upb_FieldDef_IsExtension(f)) {
upb_Message_Extension* ext = _upb_Message_GetOrCreateExtension(
msg, _upb_FieldDef_ExtensionMiniTable(f), a);
if (!ext) return false;
memcpy(&ext->data, &val, sizeof(val));
} else {
const upb_MiniTable_Field* field = upb_FieldDef_MiniTable(f);
char* mem = UPB_PTR_AT(msg, field->offset, char);
memcpy(mem, &val, get_field_size(field));
if (field->presence > 0) {
_upb_sethas_field(msg, field);
} else if (in_oneof(field)) {
*_upb_oneofcase_field(msg, field) = field->number;
}
}
return true;
}
void upb_Message_ClearField(upb_Message* msg, const upb_FieldDef* f) {
if (upb_FieldDef_IsExtension(f)) {
_upb_Message_Clearext(msg, _upb_FieldDef_ExtensionMiniTable(f));
} else {
const upb_MiniTable_Field* field = upb_FieldDef_MiniTable(f);
char* mem = UPB_PTR_AT(msg, field->offset, char);
if (field->presence > 0) {
_upb_clearhas_field(msg, field);
} else if (in_oneof(field)) {
uint32_t* oneof_case = _upb_oneofcase_field(msg, field);
if (*oneof_case != field->number) return;
*oneof_case = 0;
}
memset(mem, 0, get_field_size(field));
}
}
void upb_Message_Clear(upb_Message* msg, const upb_MessageDef* m) {
_upb_Message_Clear(msg, upb_MessageDef_MiniTable(m));
}
bool upb_Message_Next(const upb_Message* msg, const upb_MessageDef* m,
const upb_DefPool* ext_pool, const upb_FieldDef** out_f,
upb_MessageValue* out_val, size_t* iter) {
size_t i = *iter;
size_t n = upb_MessageDef_FieldCount(m);
const upb_MessageValue zero = {0};
UPB_UNUSED(ext_pool);
/* Iterate over normal fields, returning the first one that is set. */
while (++i < n) {
const upb_FieldDef* f = upb_MessageDef_Field(m, i);
upb_MessageValue val = _upb_Message_Getraw(msg, f);
/* Skip field if unset or empty. */
if (upb_FieldDef_HasPresence(f)) {
if (!upb_Message_Has(msg, f)) continue;
} else {
upb_MessageValue test = val;
if (upb_FieldDef_IsString(f) && !upb_FieldDef_IsRepeated(f)) {
/* Clear string pointer, only size matters (ptr could be non-NULL). */
test.str_val.data = NULL;
}
/* Continue if NULL or 0. */
if (memcmp(&test, &zero, sizeof(test)) == 0) continue;
/* Continue on empty array or map. */
if (upb_FieldDef_IsMap(f)) {
if (upb_Map_Size(test.map_val) == 0) continue;
} else if (upb_FieldDef_IsRepeated(f)) {
if (upb_Array_Size(test.array_val) == 0) continue;
}
}
*out_val = val;
*out_f = f;
*iter = i;
return true;
}
if (ext_pool) {
/* Return any extensions that are set. */
size_t count;
const upb_Message_Extension* ext = _upb_Message_Getexts(msg, &count);
if (i - n < count) {
ext += count - 1 - (i - n);
memcpy(out_val, &ext->data, sizeof(*out_val));
*out_f = _upb_DefPool_FindExtensionByMiniTable(ext_pool, ext->ext);
*iter = i;
return true;
}
}
*iter = i;
return false;
}
bool _upb_Message_DiscardUnknown(upb_Message* msg, const upb_MessageDef* m,
int depth) {
size_t iter = kUpb_Message_Begin;
const upb_FieldDef* f;
upb_MessageValue val;
bool ret = true;
if (--depth == 0) return false;
_upb_Message_DiscardUnknown_shallow(msg);
while (upb_Message_Next(msg, m, NULL /*ext_pool*/, &f, &val, &iter)) {
const upb_MessageDef* subm = upb_FieldDef_MessageSubDef(f);
if (!subm) continue;
if (upb_FieldDef_IsMap(f)) {
const upb_FieldDef* val_f = upb_MessageDef_FindFieldByNumber(subm, 2);
const upb_MessageDef* val_m = upb_FieldDef_MessageSubDef(val_f);
upb_Map* map = (upb_Map*)val.map_val;
size_t iter = kUpb_Map_Begin;
if (!val_m) continue;
while (upb_MapIterator_Next(map, &iter)) {
upb_MessageValue map_val = upb_MapIterator_Value(map, iter);
if (!_upb_Message_DiscardUnknown((upb_Message*)map_val.msg_val, val_m,
depth)) {
ret = false;
}
}
} else if (upb_FieldDef_IsRepeated(f)) {
const upb_Array* arr = val.array_val;
size_t i, n = upb_Array_Size(arr);
for (i = 0; i < n; i++) {
upb_MessageValue elem = upb_Array_Get(arr, i);
if (!_upb_Message_DiscardUnknown((upb_Message*)elem.msg_val, subm,
depth)) {
ret = false;
}
}
} else {
if (!_upb_Message_DiscardUnknown((upb_Message*)val.msg_val, subm,
depth)) {
ret = false;
}
}
}
return ret;
}
bool upb_Message_DiscardUnknown(upb_Message* msg, const upb_MessageDef* m,
int maxdepth) {
return _upb_Message_DiscardUnknown(msg, m, maxdepth);
}