Protocol Buffers - Google's data interchange format (grpc依赖) https://developers.google.com/protocol-buffers/
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/*
* Copyright (c) 2009-2022, 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/mini_descriptor.h"
#include <assert.h>
#include <inttypes.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include "upb/def.h"
#include "upb/mini_table.h"
// Must be last.
#include "upb/port_def.inc"
/* DescState ******************************************************************/
// Manages the storage for mini descriptor strings as they are being encoded.
// TODO(b/234740652): Move some of this state directly into the encoder, maybe.
typedef struct {
upb_MtDataEncoder e;
size_t bufsize;
char* buf;
char* ptr;
} DescState;
static void upb_DescState_Init(DescState* d) {
d->bufsize = kUpb_MtDataEncoder_MinSize * 2;
d->buf = NULL;
d->ptr = NULL;
}
static bool upb_DescState_Grow(DescState* d, upb_Arena* a) {
const size_t oldbufsize = d->bufsize;
const int used = d->ptr - d->buf;
if (!d->buf) {
d->buf = upb_Arena_Malloc(a, d->bufsize);
if (!d->buf) return false;
d->ptr = d->buf;
d->e.end = d->buf + d->bufsize;
}
if (oldbufsize - used < kUpb_MtDataEncoder_MinSize) {
d->bufsize *= 2;
d->buf = upb_Arena_Realloc(a, d->buf, oldbufsize, d->bufsize);
if (!d->buf) return false;
d->ptr = d->buf + used;
d->e.end = d->buf + d->bufsize;
}
return true;
}
static void upb_DescState_Emit(const DescState* d, upb_StringView* str) {
*str = upb_StringView_FromDataAndSize(d->buf, d->ptr - d->buf);
}
/******************************************************************************/
// Type and Field accessors.
static inline bool upb_Type_IsPackable(upb_FieldType type) {
return (type != kUpb_FieldType_String && type != kUpb_FieldType_Group &&
type != kUpb_FieldType_Message && type != kUpb_FieldType_Bytes);
}
static inline bool upb_Field_IsOneof(const google_protobuf_FieldDescriptorProto* f) {
return google_protobuf_FieldDescriptorProto_has_oneof_index(f);
}
static inline bool upb_Field_IsOptional(const google_protobuf_FieldDescriptorProto* f) {
const upb_Label label = google_protobuf_FieldDescriptorProto_label(f);
return label == kUpb_Label_Optional;
}
static inline bool upb_Field_IsRepeated(const google_protobuf_FieldDescriptorProto* f) {
const upb_Label label = google_protobuf_FieldDescriptorProto_label(f);
return label == kUpb_Label_Repeated;
}
static inline bool upb_Field_IsRequired(const google_protobuf_FieldDescriptorProto* f) {
const upb_Label label = google_protobuf_FieldDescriptorProto_label(f);
return label == kUpb_Label_Required;
}
static inline bool upb_Field_IsPackable(const google_protobuf_FieldDescriptorProto* f) {
if (!upb_Field_IsRepeated(f)) return false;
const upb_FieldType type = google_protobuf_FieldDescriptorProto_type(f);
return upb_Type_IsPackable(type);
}
static bool upb_Field_IsPacked(const google_protobuf_FieldDescriptorProto* f,
upb_Syntax syntax) {
if (!upb_Field_IsPackable(f)) return false;
const bool has_options = google_protobuf_FieldDescriptorProto_has_options(f);
const google_protobuf_FieldOptions* options = google_protobuf_FieldDescriptorProto_options(f);
switch (syntax) {
case kUpb_Syntax_Proto2:
if (!has_options) return false;
break;
default:
if (!has_options) return true;
if (!google_protobuf_FieldOptions_has_packed(options)) return true;
break;
}
return google_protobuf_FieldOptions_packed(options);
}
static inline int Field_OneofIndex(const google_protobuf_FieldDescriptorProto* f) {
return google_protobuf_FieldDescriptorProto_oneof_index(f);
}
static bool upb_Field_HasPresence(const google_protobuf_FieldDescriptorProto* f,
upb_Syntax syntax) {
if (upb_Field_IsRepeated(f)) return false;
const upb_FieldType type = google_protobuf_FieldDescriptorProto_type(f);
return type == kUpb_FieldType_Message || type == kUpb_FieldType_Group ||
upb_Field_IsOneof(f) || syntax == kUpb_Syntax_Proto2;
}
uint64_t upb_Field_Modifier(const google_protobuf_FieldDescriptorProto* f,
upb_Syntax syntax) {
uint64_t out = 0;
if (upb_Field_IsRepeated(f)) {
out |= kUpb_FieldModifier_IsRepeated;
}
if (upb_Field_IsPacked(f, syntax)) {
out |= kUpb_FieldModifier_IsPacked;
}
if (google_protobuf_FieldDescriptorProto_type(f) == kUpb_FieldType_Enum &&
syntax == kUpb_Syntax_Proto2) {
out |= kUpb_FieldModifier_IsClosedEnum;
}
if (upb_Field_IsOptional(f) && !upb_Field_HasPresence(f, syntax)) {
out |= kUpb_FieldModifier_IsProto3Singular;
}
if (upb_Field_IsRequired(f)) {
out |= kUpb_FieldModifier_IsRequired;
}
return out;
}
/******************************************************************************/
// Sort by enum value.
static int upb_MiniDescriptor_CompareEnums(const void* a, const void* b) {
const google_protobuf_EnumValueDescriptorProto* A = *(void**)a;
const google_protobuf_EnumValueDescriptorProto* B = *(void**)b;
if ((uint32_t)google_protobuf_EnumValueDescriptorProto_number(A) <
(uint32_t)google_protobuf_EnumValueDescriptorProto_number(B))
return -1;
if ((uint32_t)google_protobuf_EnumValueDescriptorProto_number(A) >
(uint32_t)google_protobuf_EnumValueDescriptorProto_number(B))
return 1;
return 0;
}
// Sort by field number.
static int upb_MiniDescriptor_CompareFields(const void* a, const void* b) {
const google_protobuf_FieldDescriptorProto* A = *(void**)a;
const google_protobuf_FieldDescriptorProto* B = *(void**)b;
if (google_protobuf_FieldDescriptorProto_number(A) <
google_protobuf_FieldDescriptorProto_number(B))
return -1;
if (google_protobuf_FieldDescriptorProto_number(A) >
google_protobuf_FieldDescriptorProto_number(B))
return 1;
return 0;
}
// Sort first by oneof index then by field number.
static int upb_MiniDescriptor_CompareOneofs(const void* a, const void* b) {
const google_protobuf_FieldDescriptorProto* A = *(void**)a;
const google_protobuf_FieldDescriptorProto* B = *(void**)b;
const int indexA = upb_Field_IsOneof(A) ? Field_OneofIndex(A) : -1;
const int indexB = upb_Field_IsOneof(B) ? Field_OneofIndex(B) : -1;
if (indexA < indexB) return -1;
if (indexA > indexB) return 1;
if (google_protobuf_FieldDescriptorProto_number(A) <
google_protobuf_FieldDescriptorProto_number(B))
return -1;
if (google_protobuf_FieldDescriptorProto_number(A) >
google_protobuf_FieldDescriptorProto_number(B))
return 1;
return 0;
}
upb_StringView upb_MiniDescriptor_EncodeEnum(
const google_protobuf_EnumDescriptorProto* enum_type, upb_Arena* a) {
upb_StringView out;
out.data = NULL;
out.size = 0;
size_t len = 0;
const google_protobuf_EnumValueDescriptorProto* const* value_types =
google_protobuf_EnumDescriptorProto_value(enum_type, &len);
// Copy and sort.
google_protobuf_EnumValueDescriptorProto** sorted = upb_gmalloc(len * sizeof(void*));
if (!sorted) goto err;
memcpy(sorted, value_types, len * sizeof(void*));
qsort(sorted, len, sizeof(void*), upb_MiniDescriptor_CompareEnums);
DescState s;
upb_DescState_Init(&s);
upb_MtDataEncoder_StartEnum(&s.e);
for (size_t i = 0; i < len; i++) {
if (!upb_DescState_Grow(&s, a)) goto err;
const uint32_t number = google_protobuf_EnumValueDescriptorProto_number(sorted[i]);
s.ptr = upb_MtDataEncoder_PutEnumValue(&s.e, s.ptr, number);
UPB_ASSERT(s.ptr);
}
if (!upb_DescState_Grow(&s, a)) goto err;
s.ptr = upb_MtDataEncoder_EndEnum(&s.e, s.ptr);
UPB_ASSERT(s.ptr);
upb_DescState_Emit(&s, &out);
err:
if (sorted) upb_gfree(sorted);
return out;
}
upb_StringView upb_MiniDescriptor_EncodeExtension(
const google_protobuf_FieldDescriptorProto* extension_type, upb_Syntax syntax,
upb_Arena* a) {
upb_StringView out;
out.data = NULL;
out.size = 0;
DescState s;
upb_DescState_Init(&s);
if (!upb_DescState_Grow(&s, a)) goto err;
upb_MtDataEncoder_StartMessage(&s.e, s.ptr, 0);
const upb_FieldType type = google_protobuf_FieldDescriptorProto_type(extension_type);
const int number = google_protobuf_FieldDescriptorProto_number(extension_type);
const uint64_t modifier = upb_Field_Modifier(extension_type, syntax);
upb_MtDataEncoder_PutField(&s.e, s.ptr, type, number, modifier);
upb_DescState_Emit(&s, &out);
err:
return out;
}
upb_StringView upb_MiniDescriptor_EncodeMessage(
const google_protobuf_DescriptorProto* message_type, upb_Syntax syntax,
upb_Arena* a) {
upb_StringView out;
out.data = NULL;
out.size = 0;
size_t len = 0;
const google_protobuf_FieldDescriptorProto* const* field_types =
google_protobuf_DescriptorProto_field(message_type, &len);
// Copy and sort.
google_protobuf_FieldDescriptorProto** sorted = upb_gmalloc(len * sizeof(void*));
if (!sorted) goto err;
memcpy(sorted, field_types, len * sizeof(void*));
qsort(sorted, len, sizeof(void*), upb_MiniDescriptor_CompareFields);
DescState s;
upb_DescState_Init(&s);
if (!upb_DescState_Grow(&s, a)) goto err;
upb_MtDataEncoder_StartMessage(&s.e, s.ptr, 0);
// Encode the fields.
size_t oneof_fields = 0;
for (size_t i = 0; i < len; i++) {
google_protobuf_FieldDescriptorProto* field_type = sorted[i];
if (upb_Field_IsOneof(field_type)) {
// Put all oneof fields at the beginning of the list for the next pass.
sorted[oneof_fields++] = field_type;
}
const upb_FieldType type = google_protobuf_FieldDescriptorProto_type(field_type);
const int number = google_protobuf_FieldDescriptorProto_number(field_type);
const uint64_t modifier = upb_Field_Modifier(field_type, syntax);
if (!upb_DescState_Grow(&s, a)) goto err;
s.ptr = upb_MtDataEncoder_PutField(&s.e, s.ptr, type, number, modifier);
UPB_ASSERT(s.ptr);
}
qsort(sorted, oneof_fields, sizeof(void*), upb_MiniDescriptor_CompareOneofs);
// Encode the oneofs.
int previous_index = -1;
for (size_t i = 0; i < oneof_fields; i++) {
google_protobuf_FieldDescriptorProto* field_type = sorted[i];
if (!upb_Field_IsOneof(field_type)) continue;
const int index = Field_OneofIndex(field_type);
if (previous_index != index) {
if (!upb_DescState_Grow(&s, a)) goto err;
s.ptr = upb_MtDataEncoder_StartOneof(&s.e, s.ptr);
UPB_ASSERT(s.ptr);
previous_index = index;
}
if (!upb_DescState_Grow(&s, a)) goto err;
s.ptr = upb_MtDataEncoder_PutOneofField(
&s.e, s.ptr, google_protobuf_FieldDescriptorProto_number(field_type));
UPB_ASSERT(s.ptr);
}
upb_DescState_Emit(&s, &out);
err:
if (sorted) upb_gfree(sorted);
return out;
}