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protobuf/upb/decode.c

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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/decode.h"
#include <string.h>
#include "upb/internal/array.h"
#include "upb/internal/decode.h"
#include "upb/msg_internal.h"
#include "upb/upb.h"
// Must be last.
#include "upb/port_def.inc"
/* Maps descriptor type -> elem_size_lg2. */
static const uint8_t desctype_to_elem_size_lg2[] = {
-1, /* invalid descriptor type */
3, /* DOUBLE */
2, /* FLOAT */
3, /* INT64 */
3, /* UINT64 */
2, /* INT32 */
3, /* FIXED64 */
2, /* FIXED32 */
0, /* BOOL */
UPB_SIZE(3, 4), /* STRING */
UPB_SIZE(2, 3), /* GROUP */
UPB_SIZE(2, 3), /* MESSAGE */
UPB_SIZE(3, 4), /* BYTES */
2, /* UINT32 */
2, /* ENUM */
2, /* SFIXED32 */
3, /* SFIXED64 */
2, /* SINT32 */
3, /* SINT64 */
};
/* Maps descriptor type -> upb map size. */
static const uint8_t desctype_to_mapsize[] = {
-1, /* invalid descriptor type */
8, /* DOUBLE */
4, /* FLOAT */
8, /* INT64 */
8, /* UINT64 */
4, /* INT32 */
8, /* FIXED64 */
4, /* FIXED32 */
1, /* BOOL */
UPB_MAPTYPE_STRING, /* STRING */
sizeof(void*), /* GROUP */
sizeof(void*), /* MESSAGE */
UPB_MAPTYPE_STRING, /* BYTES */
4, /* UINT32 */
4, /* ENUM */
4, /* SFIXED32 */
8, /* SFIXED64 */
4, /* SINT32 */
8, /* SINT64 */
};
static const unsigned FIXED32_OK_MASK = (1 << kUpb_FieldType_Float) |
(1 << kUpb_FieldType_Fixed32) |
(1 << kUpb_FieldType_SFixed32);
static const unsigned FIXED64_OK_MASK = (1 << kUpb_FieldType_Double) |
(1 << kUpb_FieldType_Fixed64) |
(1 << kUpb_FieldType_SFixed64);
/* Three fake field types for MessageSet. */
#define TYPE_MSGSET_ITEM 19
#define TYPE_COUNT 19
/* Op: an action to be performed for a wire-type/field-type combination. */
#define OP_UNKNOWN -1 /* Unknown field. */
#define OP_MSGSET_ITEM -2
#define OP_SCALAR_LG2(n) (n) /* n in [0, 2, 3] => op in [0, 2, 3] */
#define OP_ENUM 1
#define OP_STRING 4
#define OP_BYTES 5
#define OP_SUBMSG 6
/* Scalar fields use only ops above. Repeated fields can use any op. */
#define OP_FIXPCK_LG2(n) (n + 5) /* n in [2, 3] => op in [7, 8] */
#define OP_VARPCK_LG2(n) (n + 9) /* n in [0, 2, 3] => op in [9, 11, 12] */
#define OP_PACKED_ENUM 13
static const int8_t varint_ops[] = {
OP_UNKNOWN, /* field not found */
OP_UNKNOWN, /* DOUBLE */
OP_UNKNOWN, /* FLOAT */
OP_SCALAR_LG2(3), /* INT64 */
OP_SCALAR_LG2(3), /* UINT64 */
OP_SCALAR_LG2(2), /* INT32 */
OP_UNKNOWN, /* FIXED64 */
OP_UNKNOWN, /* FIXED32 */
OP_SCALAR_LG2(0), /* BOOL */
OP_UNKNOWN, /* STRING */
OP_UNKNOWN, /* GROUP */
OP_UNKNOWN, /* MESSAGE */
OP_UNKNOWN, /* BYTES */
OP_SCALAR_LG2(2), /* UINT32 */
OP_ENUM, /* ENUM */
OP_UNKNOWN, /* SFIXED32 */
OP_UNKNOWN, /* SFIXED64 */
OP_SCALAR_LG2(2), /* SINT32 */
OP_SCALAR_LG2(3), /* SINT64 */
OP_UNKNOWN, /* MSGSET_ITEM */
};
static const int8_t delim_ops[] = {
/* For non-repeated field type. */
OP_UNKNOWN, /* field not found */
OP_UNKNOWN, /* DOUBLE */
OP_UNKNOWN, /* FLOAT */
OP_UNKNOWN, /* INT64 */
OP_UNKNOWN, /* UINT64 */
OP_UNKNOWN, /* INT32 */
OP_UNKNOWN, /* FIXED64 */
OP_UNKNOWN, /* FIXED32 */
OP_UNKNOWN, /* BOOL */
OP_STRING, /* STRING */
OP_UNKNOWN, /* GROUP */
OP_SUBMSG, /* MESSAGE */
OP_BYTES, /* BYTES */
OP_UNKNOWN, /* UINT32 */
OP_UNKNOWN, /* ENUM */
OP_UNKNOWN, /* SFIXED32 */
OP_UNKNOWN, /* SFIXED64 */
OP_UNKNOWN, /* SINT32 */
OP_UNKNOWN, /* SINT64 */
OP_UNKNOWN, /* MSGSET_ITEM */
/* For repeated field type. */
OP_FIXPCK_LG2(3), /* REPEATED DOUBLE */
OP_FIXPCK_LG2(2), /* REPEATED FLOAT */
OP_VARPCK_LG2(3), /* REPEATED INT64 */
OP_VARPCK_LG2(3), /* REPEATED UINT64 */
OP_VARPCK_LG2(2), /* REPEATED INT32 */
OP_FIXPCK_LG2(3), /* REPEATED FIXED64 */
OP_FIXPCK_LG2(2), /* REPEATED FIXED32 */
OP_VARPCK_LG2(0), /* REPEATED BOOL */
OP_STRING, /* REPEATED STRING */
OP_SUBMSG, /* REPEATED GROUP */
OP_SUBMSG, /* REPEATED MESSAGE */
OP_BYTES, /* REPEATED BYTES */
OP_VARPCK_LG2(2), /* REPEATED UINT32 */
OP_PACKED_ENUM, /* REPEATED ENUM */
OP_FIXPCK_LG2(2), /* REPEATED SFIXED32 */
OP_FIXPCK_LG2(3), /* REPEATED SFIXED64 */
OP_VARPCK_LG2(2), /* REPEATED SINT32 */
OP_VARPCK_LG2(3), /* REPEATED SINT64 */
/* Omitting MSGSET_*, because we never emit a repeated msgset type */
};
typedef union {
bool bool_val;
uint32_t uint32_val;
uint64_t uint64_val;
uint32_t size;
} wireval;
static const char* _upb_Decoder_DecodeMessage(upb_Decoder* d, const char* ptr,
upb_Message* msg,
const upb_MiniTable* layout);
UPB_NORETURN static void* _upb_Decoder_ErrorJmp(upb_Decoder* d,
upb_DecodeStatus status) {
assert(status != kUpb_DecodeStatus_Ok);
UPB_LONGJMP(d->err, status);
}
const char* _upb_FastDecoder_ErrorJmp(upb_Decoder* d, int status) {
assert(status != kUpb_DecodeStatus_Ok);
UPB_LONGJMP(d->err, status);
return NULL;
}
static void _upb_Decoder_VerifyUtf8(upb_Decoder* d, const char* buf, int len) {
if (!_upb_Decoder_VerifyUtf8Inline(buf, len)) {
_upb_Decoder_ErrorJmp(d, kUpb_DecodeStatus_BadUtf8);
}
}
static bool _upb_Decoder_Reserve(upb_Decoder* d, upb_Array* arr, size_t elem) {
bool need_realloc = arr->capacity - arr->size < elem;
if (need_realloc && !_upb_array_realloc(arr, arr->size + elem, &d->arena)) {
_upb_Decoder_ErrorJmp(d, kUpb_DecodeStatus_OutOfMemory);
}
return need_realloc;
}
typedef struct {
const char* ptr;
uint64_t val;
} _upb_DecodeLongVarintReturn;
UPB_NOINLINE
static _upb_DecodeLongVarintReturn _upb_Decoder_DecodeLongVarint(
const char* ptr, uint64_t val) {
_upb_DecodeLongVarintReturn ret = {NULL, 0};
uint64_t byte;
int i;
for (i = 1; i < 10; i++) {
byte = (uint8_t)ptr[i];
val += (byte - 1) << (i * 7);
if (!(byte & 0x80)) {
ret.ptr = ptr + i + 1;
ret.val = val;
return ret;
}
}
return ret;
}
UPB_FORCEINLINE
static const char* _upb_Decoder_DecodeVarint(upb_Decoder* d, const char* ptr,
uint64_t* val) {
uint64_t byte = (uint8_t)*ptr;
if (UPB_LIKELY((byte & 0x80) == 0)) {
*val = byte;
return ptr + 1;
} else {
_upb_DecodeLongVarintReturn res = _upb_Decoder_DecodeLongVarint(ptr, byte);
if (!res.ptr) _upb_Decoder_ErrorJmp(d, kUpb_DecodeStatus_Malformed);
*val = res.val;
return res.ptr;
}
}
UPB_FORCEINLINE
static const char* _upb_Decoder_DecodeTag(upb_Decoder* d, const char* ptr,
uint32_t* val) {
uint64_t byte = (uint8_t)*ptr;
if (UPB_LIKELY((byte & 0x80) == 0)) {
*val = byte;
return ptr + 1;
} else {
const char* start = ptr;
_upb_DecodeLongVarintReturn res = _upb_Decoder_DecodeLongVarint(ptr, byte);
if (!res.ptr || res.ptr - start > 5 || res.val > UINT32_MAX) {
_upb_Decoder_ErrorJmp(d, kUpb_DecodeStatus_Malformed);
}
*val = res.val;
return res.ptr;
}
}
UPB_FORCEINLINE
static const char* upb_Decoder_DecodeSize(upb_Decoder* d, const char* ptr,
uint32_t* size) {
uint64_t size64;
ptr = _upb_Decoder_DecodeVarint(d, ptr, &size64);
if (size64 >= INT32_MAX || ptr - d->end + (int)size64 > d->limit) {
_upb_Decoder_ErrorJmp(d, kUpb_DecodeStatus_Malformed);
}
*size = size64;
return ptr;
}
static void _upb_Decoder_MungeInt32(wireval* val) {
if (!_upb_IsLittleEndian()) {
/* The next stage will memcpy(dst, &val, 4) */
val->uint32_val = val->uint64_val;
}
}
static void _upb_Decoder_Munge(int type, wireval* val) {
switch (type) {
case kUpb_FieldType_Bool:
val->bool_val = val->uint64_val != 0;
break;
case kUpb_FieldType_SInt32: {
uint32_t n = val->uint64_val;
val->uint32_val = (n >> 1) ^ -(int32_t)(n & 1);
break;
}
case kUpb_FieldType_SInt64: {
uint64_t n = val->uint64_val;
val->uint64_val = (n >> 1) ^ -(int64_t)(n & 1);
break;
}
case kUpb_FieldType_Int32:
case kUpb_FieldType_UInt32:
case kUpb_FieldType_Enum:
_upb_Decoder_MungeInt32(val);
break;
}
}
static upb_Message* _upb_Decoder_NewSubMessage(
upb_Decoder* d, const upb_MiniTable_Sub* subs,
const upb_MiniTable_Field* field) {
const upb_MiniTable* subl = subs[field->submsg_index].submsg;
upb_Message* msg = _upb_Message_New_inl(subl, &d->arena);
if (!msg) _upb_Decoder_ErrorJmp(d, kUpb_DecodeStatus_OutOfMemory);
return msg;
}
UPB_NOINLINE
const char* _upb_Decoder_IsDoneFallback(upb_Decoder* d, const char* ptr,
int overrun) {
int status;
ptr = _upb_Decoder_IsDoneFallbackInline(d, ptr, overrun, &status);
if (ptr == NULL) _upb_Decoder_ErrorJmp(d, status);
return ptr;
}
static const char* _upb_Decoder_ReadString(upb_Decoder* d, const char* ptr,
int size, upb_StringView* str) {
if (d->options & kUpb_DecodeOption_AliasString) {
str->data = ptr;
} else {
char* data = upb_Arena_Malloc(&d->arena, size);
if (!data) _upb_Decoder_ErrorJmp(d, kUpb_DecodeStatus_OutOfMemory);
memcpy(data, ptr, size);
str->data = data;
}
str->size = size;
return ptr + size;
}
UPB_FORCEINLINE
static const char* _upb_Decoder_DecodeSubMessage(
upb_Decoder* d, const char* ptr, upb_Message* submsg,
const upb_MiniTable_Sub* subs, const upb_MiniTable_Field* field, int size) {
int saved_delta = _upb_Decoder_PushLimit(d, ptr, size);
const upb_MiniTable* subl = subs[field->submsg_index].submsg;
if (--d->depth < 0) {
_upb_Decoder_ErrorJmp(d, kUpb_DecodeStatus_MaxDepthExceeded);
}
ptr = _upb_Decoder_DecodeMessage(d, ptr, submsg, subl);
if (d->end_group != DECODE_NOGROUP) {
_upb_Decoder_ErrorJmp(d, kUpb_DecodeStatus_Malformed);
}
_upb_Decoder_PopLimit(d, ptr, saved_delta);
d->depth++;
return ptr;
}
UPB_FORCEINLINE
static const char* _upb_Decoder_DoDecodeGroup(upb_Decoder* d, const char* ptr,
upb_Message* submsg,
const upb_MiniTable* subl,
uint32_t number) {
if (--d->depth < 0) {
_upb_Decoder_ErrorJmp(d, kUpb_DecodeStatus_MaxDepthExceeded);
}
if (_upb_Decoder_IsDone(d, &ptr)) {
_upb_Decoder_ErrorJmp(d, kUpb_DecodeStatus_Malformed);
}
ptr = _upb_Decoder_DecodeMessage(d, ptr, submsg, subl);
if (d->end_group != number) {
_upb_Decoder_ErrorJmp(d, kUpb_DecodeStatus_Malformed);
}
d->end_group = DECODE_NOGROUP;
d->depth++;
return ptr;
}
UPB_FORCEINLINE
static const char* _upb_Decoder_DecodeUnknownGroup(upb_Decoder* d,
const char* ptr,
uint32_t number) {
return _upb_Decoder_DoDecodeGroup(d, ptr, NULL, NULL, number);
}
UPB_FORCEINLINE
static const char* _upb_Decoder_DecodeKnownGroup(
upb_Decoder* d, const char* ptr, upb_Message* submsg,
const upb_MiniTable_Sub* subs, const upb_MiniTable_Field* field) {
const upb_MiniTable* subl = subs[field->submsg_index].submsg;
return _upb_Decoder_DoDecodeGroup(d, ptr, submsg, subl, field->number);
}
static char* upb_Decoder_EncodeVarint32(uint32_t val, char* ptr) {
do {
uint8_t byte = val & 0x7fU;
val >>= 7;
if (val) byte |= 0x80U;
*(ptr++) = byte;
} while (val);
return ptr;
}
static void _upb_Decoder_AddUnknownVarints(upb_Decoder* d, upb_Message* msg,
uint32_t val1, uint32_t val2) {
char buf[20];
char* end = buf;
end = upb_Decoder_EncodeVarint32(val1, end);
end = upb_Decoder_EncodeVarint32(val2, end);
if (!_upb_Message_AddUnknown(msg, buf, end - buf, &d->arena)) {
_upb_Decoder_ErrorJmp(d, kUpb_DecodeStatus_OutOfMemory);
}
}
UPB_NOINLINE
static bool _upb_Decoder_CheckEnumSlow(upb_Decoder* d, const char* ptr,
upb_Message* msg,
const upb_MiniTable_Enum* e,
const upb_MiniTable_Field* field,
uint32_t v) {
if (_upb_MiniTable_CheckEnumValueSlow(e, v)) return true;
// Unrecognized enum goes into unknown fields.
// For packed fields the tag could be arbitrarily far in the past, so we
// just re-encode the tag and value here.
uint32_t tag = ((uint32_t)field->number << 3) | kUpb_WireType_Varint;
upb_Message* unknown_msg =
field->mode & kUpb_LabelFlags_IsExtension ? d->unknown_msg : msg;
_upb_Decoder_AddUnknownVarints(d, unknown_msg, tag, v);
return false;
}
UPB_FORCEINLINE
static bool _upb_Decoder_CheckEnum(upb_Decoder* d, const char* ptr,
upb_Message* msg,
const upb_MiniTable_Enum* e,
const upb_MiniTable_Field* field,
wireval* val) {
uint32_t v = val->uint32_val;
_kUpb_FastEnumCheck_Status status = _upb_MiniTable_CheckEnumValueFast(e, v);
if (UPB_LIKELY(status == _kUpb_FastEnumCheck_ValueIsInEnum)) return true;
return _upb_Decoder_CheckEnumSlow(d, ptr, msg, e, field, v);
}
UPB_NOINLINE
static const char* _upb_Decoder_DecodeEnumArray(
upb_Decoder* d, const char* ptr, upb_Message* msg, upb_Array* arr,
const upb_MiniTable_Sub* subs, const upb_MiniTable_Field* field,
wireval* val) {
const upb_MiniTable_Enum* e = subs[field->submsg_index].subenum;
if (!_upb_Decoder_CheckEnum(d, ptr, msg, e, field, val)) return ptr;
void* mem = UPB_PTR_AT(_upb_array_ptr(arr), arr->size * 4, void);
arr->size++;
memcpy(mem, val, 4);
return ptr;
}
UPB_FORCEINLINE
static const char* _upb_Decoder_DecodeFixedPacked(
upb_Decoder* d, const char* ptr, upb_Array* arr, wireval* val,
const upb_MiniTable_Field* field, int lg2) {
int mask = (1 << lg2) - 1;
size_t count = val->size >> lg2;
if ((val->size & mask) != 0) {
// Length isn't a round multiple of elem size.
_upb_Decoder_ErrorJmp(d, kUpb_DecodeStatus_Malformed);
}
_upb_Decoder_Reserve(d, arr, count);
void* mem = UPB_PTR_AT(_upb_array_ptr(arr), arr->size << lg2, void);
arr->size += count;
// Note: if/when the decoder supports multi-buffer input, we will need to
// handle buffer seams here.
if (_upb_IsLittleEndian()) {
memcpy(mem, ptr, val->size);
ptr += val->size;
} else {
const char* end = ptr + val->size;
char* dst = mem;
while (ptr < end) {
if (lg2 == 2) {
uint32_t val;
memcpy(&val, ptr, sizeof(val));
val = _upb_BigEndian_Swap32(val);
memcpy(dst, &val, sizeof(val));
} else {
UPB_ASSERT(lg2 == 3);
uint64_t val;
memcpy(&val, ptr, sizeof(val));
val = _upb_BigEndian_Swap64(val);
memcpy(dst, &val, sizeof(val));
}
ptr += 1 << lg2;
dst += 1 << lg2;
}
}
return ptr;
}
UPB_FORCEINLINE
static const char* _upb_Decoder_DecodeVarintPacked(
upb_Decoder* d, const char* ptr, upb_Array* arr, wireval* val,
const upb_MiniTable_Field* field, int lg2) {
int scale = 1 << lg2;
int saved_limit = _upb_Decoder_PushLimit(d, ptr, val->size);
char* out = UPB_PTR_AT(_upb_array_ptr(arr), arr->size << lg2, void);
while (!_upb_Decoder_IsDone(d, &ptr)) {
wireval elem;
ptr = _upb_Decoder_DecodeVarint(d, ptr, &elem.uint64_val);
_upb_Decoder_Munge(field->descriptortype, &elem);
if (_upb_Decoder_Reserve(d, arr, 1)) {
out = UPB_PTR_AT(_upb_array_ptr(arr), arr->size << lg2, void);
}
arr->size++;
memcpy(out, &elem, scale);
out += scale;
}
_upb_Decoder_PopLimit(d, ptr, saved_limit);
return ptr;
}
UPB_NOINLINE
static const char* _upb_Decoder_DecodeEnumPacked(
upb_Decoder* d, const char* ptr, upb_Message* msg, upb_Array* arr,
const upb_MiniTable_Sub* subs, const upb_MiniTable_Field* field,
wireval* val) {
const upb_MiniTable_Enum* e = subs[field->submsg_index].subenum;
int saved_limit = _upb_Decoder_PushLimit(d, ptr, val->size);
char* out = UPB_PTR_AT(_upb_array_ptr(arr), arr->size * 4, void);
while (!_upb_Decoder_IsDone(d, &ptr)) {
wireval elem;
ptr = _upb_Decoder_DecodeVarint(d, ptr, &elem.uint64_val);
_upb_Decoder_MungeInt32(&elem);
if (!_upb_Decoder_CheckEnum(d, ptr, msg, e, field, &elem)) {
continue;
}
if (_upb_Decoder_Reserve(d, arr, 1)) {
out = UPB_PTR_AT(_upb_array_ptr(arr), arr->size * 4, void);
}
arr->size++;
memcpy(out, &elem, 4);
out += 4;
}
_upb_Decoder_PopLimit(d, ptr, saved_limit);
return ptr;
}
static const char* _upb_Decoder_DecodeToArray(upb_Decoder* d, const char* ptr,
upb_Message* msg,
const upb_MiniTable_Sub* subs,
const upb_MiniTable_Field* field,
wireval* val, int op) {
upb_Array** arrp = UPB_PTR_AT(msg, field->offset, void);
upb_Array* arr = *arrp;
void* mem;
if (arr) {
_upb_Decoder_Reserve(d, arr, 1);
} else {
size_t lg2 = desctype_to_elem_size_lg2[field->descriptortype];
arr = _upb_Array_New(&d->arena, 4, lg2);
if (!arr) _upb_Decoder_ErrorJmp(d, kUpb_DecodeStatus_OutOfMemory);
*arrp = arr;
}
switch (op) {
case OP_SCALAR_LG2(0):
case OP_SCALAR_LG2(2):
case OP_SCALAR_LG2(3):
/* Append scalar value. */
mem = UPB_PTR_AT(_upb_array_ptr(arr), arr->size << op, void);
arr->size++;
memcpy(mem, val, 1 << op);
return ptr;
case OP_STRING:
_upb_Decoder_VerifyUtf8(d, ptr, val->size);
/* Fallthrough. */
case OP_BYTES: {
/* Append bytes. */
upb_StringView* str = (upb_StringView*)_upb_array_ptr(arr) + arr->size;
arr->size++;
return _upb_Decoder_ReadString(d, ptr, val->size, str);
}
case OP_SUBMSG: {
/* Append submessage / group. */
upb_Message* submsg = _upb_Decoder_NewSubMessage(d, subs, field);
*UPB_PTR_AT(_upb_array_ptr(arr), arr->size * sizeof(void*),
upb_Message*) = submsg;
arr->size++;
if (UPB_UNLIKELY(field->descriptortype == kUpb_FieldType_Group)) {
return _upb_Decoder_DecodeKnownGroup(d, ptr, submsg, subs, field);
} else {
return _upb_Decoder_DecodeSubMessage(d, ptr, submsg, subs, field,
val->size);
}
}
case OP_FIXPCK_LG2(2):
case OP_FIXPCK_LG2(3):
return _upb_Decoder_DecodeFixedPacked(d, ptr, arr, val, field,
op - OP_FIXPCK_LG2(0));
case OP_VARPCK_LG2(0):
case OP_VARPCK_LG2(2):
case OP_VARPCK_LG2(3):
return _upb_Decoder_DecodeVarintPacked(d, ptr, arr, val, field,
op - OP_VARPCK_LG2(0));
case OP_ENUM:
return _upb_Decoder_DecodeEnumArray(d, ptr, msg, arr, subs, field, val);
case OP_PACKED_ENUM:
return _upb_Decoder_DecodeEnumPacked(d, ptr, msg, arr, subs, field, val);
default:
UPB_UNREACHABLE();
}
}
static const char* _upb_Decoder_DecodeToMap(upb_Decoder* d, const char* ptr,
upb_Message* msg,
const upb_MiniTable_Sub* subs,
const upb_MiniTable_Field* field,
wireval* val) {
upb_Map** map_p = UPB_PTR_AT(msg, field->offset, upb_Map*);
upb_Map* map = *map_p;
upb_MapEntry ent;
const upb_MiniTable* entry = subs[field->submsg_index].submsg;
if (!map) {
/* Lazily create map. */
const upb_MiniTable_Field* key_field = &entry->fields[0];
const upb_MiniTable_Field* val_field = &entry->fields[1];
char key_size = desctype_to_mapsize[key_field->descriptortype];
char val_size = desctype_to_mapsize[val_field->descriptortype];
UPB_ASSERT(key_field->offset == 0);
UPB_ASSERT(val_field->offset == sizeof(upb_StringView));
map = _upb_Map_New(&d->arena, key_size, val_size);
*map_p = map;
}
/* Parse map entry. */
memset(&ent, 0, sizeof(ent));
if (entry->fields[1].descriptortype == kUpb_FieldType_Message ||
entry->fields[1].descriptortype == kUpb_FieldType_Group) {
/* Create proactively to handle the case where it doesn't appear. */
ent.v.val =
upb_value_ptr(_upb_Message_New(entry->subs[0].submsg, &d->arena));
}
const char* start = ptr;
ptr = _upb_Decoder_DecodeSubMessage(d, ptr, &ent.k, subs, field, val->size);
// check if ent had any unknown fields
size_t size;
upb_Message_GetUnknown(&ent.k, &size);
if (size != 0) {
uint32_t tag = ((uint32_t)field->number << 3) | kUpb_WireType_Delimited;
_upb_Decoder_AddUnknownVarints(d, msg, tag, (uint32_t)(ptr - start));
if (!_upb_Message_AddUnknown(msg, start, ptr - start, &d->arena)) {
_upb_Decoder_ErrorJmp(d, kUpb_DecodeStatus_OutOfMemory);
}
} else {
if (_upb_Map_Insert(map, &ent.k, map->key_size, &ent.v, map->val_size,
&d->arena) == _kUpb_MapInsertStatus_OutOfMemory) {
_upb_Decoder_ErrorJmp(d, kUpb_DecodeStatus_OutOfMemory);
}
}
return ptr;
}
static const char* _upb_Decoder_DecodeToSubMessage(
upb_Decoder* d, const char* ptr, upb_Message* msg,
const upb_MiniTable_Sub* subs, const upb_MiniTable_Field* field,
wireval* val, int op) {
void* mem = UPB_PTR_AT(msg, field->offset, void);
int type = field->descriptortype;
if (UPB_UNLIKELY(op == OP_ENUM) &&
!_upb_Decoder_CheckEnum(d, ptr, msg, subs[field->submsg_index].subenum,
field, val)) {
return ptr;
}
/* Set presence if necessary. */
if (field->presence > 0) {
_upb_sethas_field(msg, field);
} else if (field->presence < 0) {
/* Oneof case */
uint32_t* oneof_case = _upb_oneofcase_field(msg, field);
if (op == OP_SUBMSG && *oneof_case != field->number) {
memset(mem, 0, sizeof(void*));
}
*oneof_case = field->number;
}
/* Store into message. */
switch (op) {
case OP_SUBMSG: {
upb_Message** submsgp = mem;
upb_Message* submsg = *submsgp;
if (!submsg) {
submsg = _upb_Decoder_NewSubMessage(d, subs, field);
*submsgp = submsg;
}
if (UPB_UNLIKELY(type == kUpb_FieldType_Group)) {
ptr = _upb_Decoder_DecodeKnownGroup(d, ptr, submsg, subs, field);
} else {
ptr = _upb_Decoder_DecodeSubMessage(d, ptr, submsg, subs, field,
val->size);
}
break;
}
case OP_STRING:
_upb_Decoder_VerifyUtf8(d, ptr, val->size);
/* Fallthrough. */
case OP_BYTES:
return _upb_Decoder_ReadString(d, ptr, val->size, mem);
case OP_SCALAR_LG2(3):
memcpy(mem, val, 8);
break;
case OP_ENUM:
case OP_SCALAR_LG2(2):
memcpy(mem, val, 4);
break;
case OP_SCALAR_LG2(0):
memcpy(mem, val, 1);
break;
default:
UPB_UNREACHABLE();
}
return ptr;
}
UPB_NOINLINE
const char* _upb_Decoder_CheckRequired(upb_Decoder* d, const char* ptr,
const upb_Message* msg,
const upb_MiniTable* l) {
assert(l->required_count);
if (UPB_LIKELY((d->options & kUpb_DecodeOption_CheckRequired) == 0)) {
return ptr;
}
uint64_t msg_head;
memcpy(&msg_head, msg, 8);
msg_head = _upb_BigEndian_Swap64(msg_head);
if (upb_MiniTable_requiredmask(l) & ~msg_head) {
d->missing_required = true;
}
return ptr;
}
UPB_FORCEINLINE
static bool _upb_Decoder_TryFastDispatch(upb_Decoder* d, const char** ptr,
upb_Message* msg,
const upb_MiniTable* layout) {
#if UPB_FASTTABLE
if (layout && layout->table_mask != (unsigned char)-1) {
uint16_t tag = _upb_FastDecoder_LoadTag(*ptr);
intptr_t table = decode_totable(layout);
*ptr = _upb_FastDecoder_TagDispatch(d, *ptr, msg, table, 0, tag);
return true;
}
#endif
return false;
}
static const char* upb_Decoder_SkipField(upb_Decoder* d, const char* ptr,
uint32_t tag) {
int field_number = tag >> 3;
int wire_type = tag & 7;
switch (wire_type) {
case kUpb_WireType_Varint: {
uint64_t val;
return _upb_Decoder_DecodeVarint(d, ptr, &val);
}
case kUpb_WireType_64Bit:
return ptr + 8;
case kUpb_WireType_32Bit:
return ptr + 4;
case kUpb_WireType_Delimited: {
uint32_t size;
ptr = upb_Decoder_DecodeSize(d, ptr, &size);
return ptr + size;
}
case kUpb_WireType_StartGroup:
return _upb_Decoder_DecodeUnknownGroup(d, ptr, field_number);
default:
_upb_Decoder_ErrorJmp(d, kUpb_DecodeStatus_Malformed);
}
}
enum {
kStartItemTag = ((1 << 3) | kUpb_WireType_StartGroup),
kEndItemTag = ((1 << 3) | kUpb_WireType_EndGroup),
kTypeIdTag = ((2 << 3) | kUpb_WireType_Varint),
kMessageTag = ((3 << 3) | kUpb_WireType_Delimited),
};
static void upb_Decoder_AddKnownMessageSetItem(
upb_Decoder* d, upb_Message* msg, const upb_MiniTable_Extension* item_mt,
const char* data, uint32_t size) {
upb_Message_Extension* ext =
_upb_Message_GetOrCreateExtension(msg, item_mt, &d->arena);
if (UPB_UNLIKELY(!ext)) {
_upb_Decoder_ErrorJmp(d, kUpb_DecodeStatus_OutOfMemory);
}
upb_Message* submsg =
_upb_Decoder_NewSubMessage(d, &ext->ext->sub, &ext->ext->field);
upb_DecodeStatus status = upb_Decode(data, size, submsg, item_mt->sub.submsg,
d->extreg, d->options, &d->arena);
memcpy(&ext->data, &submsg, sizeof(submsg));
if (status != kUpb_DecodeStatus_Ok) _upb_Decoder_ErrorJmp(d, status);
}
static void upb_Decoder_AddUnknownMessageSetItem(upb_Decoder* d,
upb_Message* msg,
uint32_t type_id,
const char* message_data,
uint32_t message_size) {
char buf[60];
char* ptr = buf;
ptr = upb_Decoder_EncodeVarint32(kStartItemTag, ptr);
ptr = upb_Decoder_EncodeVarint32(kTypeIdTag, ptr);
ptr = upb_Decoder_EncodeVarint32(type_id, ptr);
ptr = upb_Decoder_EncodeVarint32(kMessageTag, ptr);
ptr = upb_Decoder_EncodeVarint32(message_size, ptr);
char* split = ptr;
ptr = upb_Decoder_EncodeVarint32(kEndItemTag, ptr);
char* end = ptr;
if (!_upb_Message_AddUnknown(msg, buf, split - buf, &d->arena) ||
!_upb_Message_AddUnknown(msg, message_data, message_size, &d->arena) ||
!_upb_Message_AddUnknown(msg, split, end - split, &d->arena)) {
_upb_Decoder_ErrorJmp(d, kUpb_DecodeStatus_OutOfMemory);
}
}
static void upb_Decoder_AddMessageSetItem(upb_Decoder* d, upb_Message* msg,
const upb_MiniTable* layout,
uint32_t type_id, const char* data,
uint32_t size) {
const upb_MiniTable_Extension* item_mt =
_upb_extreg_get(d->extreg, layout, type_id);
if (item_mt) {
upb_Decoder_AddKnownMessageSetItem(d, msg, item_mt, data, size);
} else {
upb_Decoder_AddUnknownMessageSetItem(d, msg, type_id, data, size);
}
}
static const char* upb_Decoder_DecodeMessageSetItem(
upb_Decoder* d, const char* ptr, upb_Message* msg,
const upb_MiniTable* layout) {
uint32_t type_id = 0;
upb_StringView preserved = {NULL, 0};
typedef enum {
kUpb_HaveId = 1 << 0,
kUpb_HavePayload = 1 << 1,
} StateMask;
StateMask state_mask = 0;
while (!_upb_Decoder_IsDone(d, &ptr)) {
uint32_t tag;
ptr = _upb_Decoder_DecodeTag(d, ptr, &tag);
switch (tag) {
case kEndItemTag:
return ptr;
case kTypeIdTag: {
uint64_t tmp;
ptr = _upb_Decoder_DecodeVarint(d, ptr, &tmp);
if (state_mask & kUpb_HaveId) break; // Ignore dup.
state_mask |= kUpb_HaveId;
type_id = tmp;
if (state_mask & kUpb_HavePayload) {
upb_Decoder_AddMessageSetItem(d, msg, layout, type_id, preserved.data,
preserved.size);
}
break;
}
case kMessageTag: {
uint32_t size;
ptr = upb_Decoder_DecodeSize(d, ptr, &size);
const char* data = ptr;
ptr += size;
if (state_mask & kUpb_HavePayload) break; // Ignore dup.
state_mask |= kUpb_HavePayload;
if (state_mask & kUpb_HaveId) {
upb_Decoder_AddMessageSetItem(d, msg, layout, type_id, data, size);
} else {
// Out of order, we must preserve the payload.
preserved.data = data;
preserved.size = size;
}
break;
}
default:
// We do not preserve unexpected fields inside a message set item.
ptr = upb_Decoder_SkipField(d, ptr, tag);
break;
}
}
_upb_Decoder_ErrorJmp(d, kUpb_DecodeStatus_Malformed);
}
static const upb_MiniTable_Field* _upb_Decoder_FindField(
upb_Decoder* d, const upb_MiniTable* l, uint32_t field_number,
int* last_field_index) {
static upb_MiniTable_Field none = {0, 0, 0, 0, 0, 0};
if (l == NULL) return &none;
size_t idx = ((size_t)field_number) - 1; // 0 wraps to SIZE_MAX
if (idx < l->dense_below) {
/* Fastest case: index into dense fields. */
goto found;
}
if (l->dense_below < l->field_count) {
/* Linear search non-dense fields. Resume scanning from last_field_index
* since fields are usually in order. */
int last = *last_field_index;
for (idx = last; idx < l->field_count; idx++) {
if (l->fields[idx].number == field_number) {
goto found;
}
}
for (idx = l->dense_below; idx < last; idx++) {
if (l->fields[idx].number == field_number) {
goto found;
}
}
}
if (d->extreg) {
switch (l->ext) {
case kUpb_ExtMode_Extendable: {
const upb_MiniTable_Extension* ext =
_upb_extreg_get(d->extreg, l, field_number);
if (ext) return &ext->field;
break;
}
case kUpb_ExtMode_IsMessageSet:
if (field_number == _UPB_MSGSET_ITEM) {
static upb_MiniTable_Field item = {0, 0, 0, 0, TYPE_MSGSET_ITEM, 0};
return &item;
}
break;
}
}
return &none; /* Unknown field. */
found:
UPB_ASSERT(l->fields[idx].number == field_number);
*last_field_index = idx;
return &l->fields[idx];
}
UPB_FORCEINLINE
static const char* _upb_Decoder_DecodeWireValue(
upb_Decoder* d, const char* ptr, const upb_MiniTable_Field* field,
int wire_type, wireval* val, int* op) {
switch (wire_type) {
case kUpb_WireType_Varint:
ptr = _upb_Decoder_DecodeVarint(d, ptr, &val->uint64_val);
*op = varint_ops[field->descriptortype];
_upb_Decoder_Munge(field->descriptortype, val);
return ptr;
case kUpb_WireType_32Bit:
memcpy(&val->uint32_val, ptr, 4);
val->uint32_val = _upb_BigEndian_Swap32(val->uint32_val);
*op = OP_SCALAR_LG2(2);
if (((1 << field->descriptortype) & FIXED32_OK_MASK) == 0) {
*op = OP_UNKNOWN;
}
return ptr + 4;
case kUpb_WireType_64Bit:
memcpy(&val->uint64_val, ptr, 8);
val->uint64_val = _upb_BigEndian_Swap64(val->uint64_val);
*op = OP_SCALAR_LG2(3);
if (((1 << field->descriptortype) & FIXED64_OK_MASK) == 0) {
*op = OP_UNKNOWN;
}
return ptr + 8;
case kUpb_WireType_Delimited: {
int ndx = field->descriptortype;
if (upb_FieldMode_Get(field) == kUpb_FieldMode_Array) ndx += TYPE_COUNT;
ptr = upb_Decoder_DecodeSize(d, ptr, &val->size);
*op = delim_ops[ndx];
return ptr;
}
case kUpb_WireType_StartGroup:
val->uint32_val = field->number;
if (field->descriptortype == kUpb_FieldType_Group) {
*op = OP_SUBMSG;
} else if (field->descriptortype == TYPE_MSGSET_ITEM) {
*op = OP_MSGSET_ITEM;
} else {
*op = OP_UNKNOWN;
}
return ptr;
default:
break;
}
_upb_Decoder_ErrorJmp(d, kUpb_DecodeStatus_Malformed);
}
UPB_FORCEINLINE
static const char* _upb_Decoder_DecodeKnownField(
upb_Decoder* d, const char* ptr, upb_Message* msg,
const upb_MiniTable* layout, const upb_MiniTable_Field* field, int op,
wireval* val) {
const upb_MiniTable_Sub* subs = layout->subs;
uint8_t mode = field->mode;
if (UPB_UNLIKELY(mode & kUpb_LabelFlags_IsExtension)) {
const upb_MiniTable_Extension* ext_layout =
(const upb_MiniTable_Extension*)field;
upb_Message_Extension* ext =
_upb_Message_GetOrCreateExtension(msg, ext_layout, &d->arena);
if (UPB_UNLIKELY(!ext)) {
_upb_Decoder_ErrorJmp(d, kUpb_DecodeStatus_OutOfMemory);
}
d->unknown_msg = msg;
msg = &ext->data;
subs = &ext->ext->sub;
}
switch (mode & kUpb_FieldMode_Mask) {
case kUpb_FieldMode_Array:
return _upb_Decoder_DecodeToArray(d, ptr, msg, subs, field, val, op);
case kUpb_FieldMode_Map:
return _upb_Decoder_DecodeToMap(d, ptr, msg, subs, field, val);
case kUpb_FieldMode_Scalar:
return _upb_Decoder_DecodeToSubMessage(d, ptr, msg, subs, field, val, op);
default:
UPB_UNREACHABLE();
}
}
static const char* _upb_Decoder_ReverseSkipVarint(const char* ptr,
uint32_t val) {
uint32_t seen = 0;
do {
ptr--;
seen <<= 7;
seen |= *ptr & 0x7f;
} while (seen != val);
return ptr;
}
static const char* _upb_Decoder_DecodeUnknownField(upb_Decoder* d,
const char* ptr,
upb_Message* msg,
int field_number,
int wire_type, wireval val) {
if (field_number == 0) _upb_Decoder_ErrorJmp(d, kUpb_DecodeStatus_Malformed);
// Since unknown fields are the uncommon case, we do a little extra work here
// to walk backwards through the buffer to find the field start. This frees
// up a register in the fast paths (when the field is known), which leads to
// significant speedups in benchmarks.
const char* start = ptr;
if (wire_type == kUpb_WireType_Delimited) ptr += val.size;
if (msg) {
switch (wire_type) {
case kUpb_WireType_Varint:
case kUpb_WireType_Delimited:
start--;
while (start[-1] & 0x80) start--;
break;
case kUpb_WireType_32Bit:
start -= 4;
break;
case kUpb_WireType_64Bit:
start -= 8;
break;
default:
break;
}
assert(start == d->debug_valstart);
uint32_t tag = ((uint32_t)field_number << 3) | wire_type;
start = _upb_Decoder_ReverseSkipVarint(start, tag);
assert(start == d->debug_tagstart);
if (wire_type == kUpb_WireType_StartGroup) {
d->unknown = start;
d->unknown_msg = msg;
ptr = _upb_Decoder_DecodeUnknownGroup(d, ptr, field_number);
start = d->unknown;
d->unknown = NULL;
}
if (!_upb_Message_AddUnknown(msg, start, ptr - start, &d->arena)) {
_upb_Decoder_ErrorJmp(d, kUpb_DecodeStatus_OutOfMemory);
}
} else if (wire_type == kUpb_WireType_StartGroup) {
ptr = _upb_Decoder_DecodeUnknownGroup(d, ptr, field_number);
}
return ptr;
}
UPB_NOINLINE
static const char* _upb_Decoder_DecodeMessage(upb_Decoder* d, const char* ptr,
upb_Message* msg,
const upb_MiniTable* layout) {
int last_field_index = 0;
#if UPB_FASTTABLE
// The first time we want to skip fast dispatch, because we may have just been
// invoked by the fast parser to handle a case that it bailed on.
if (!_upb_Decoder_IsDone(d, &ptr)) goto nofast;
#endif
while (!_upb_Decoder_IsDone(d, &ptr)) {
uint32_t tag;
const upb_MiniTable_Field* field;
int field_number;
int wire_type;
wireval val;
int op;
if (_upb_Decoder_TryFastDispatch(d, &ptr, msg, layout)) break;
#if UPB_FASTTABLE
nofast:
#endif
#ifndef NDEBUG
d->debug_tagstart = ptr;
#endif
UPB_ASSERT(ptr < d->limit_ptr);
ptr = _upb_Decoder_DecodeTag(d, ptr, &tag);
field_number = tag >> 3;
wire_type = tag & 7;
#ifndef NDEBUG
d->debug_valstart = ptr;
#endif
if (wire_type == kUpb_WireType_EndGroup) {
d->end_group = field_number;
return ptr;
}
field = _upb_Decoder_FindField(d, layout, field_number, &last_field_index);
ptr = _upb_Decoder_DecodeWireValue(d, ptr, field, wire_type, &val, &op);
if (op >= 0) {
ptr = _upb_Decoder_DecodeKnownField(d, ptr, msg, layout, field, op, &val);
} else {
switch (op) {
case OP_UNKNOWN:
ptr = _upb_Decoder_DecodeUnknownField(d, ptr, msg, field_number,
wire_type, val);
break;
case OP_MSGSET_ITEM:
ptr = upb_Decoder_DecodeMessageSetItem(d, ptr, msg, layout);
break;
}
}
}
return UPB_UNLIKELY(layout && layout->required_count)
? _upb_Decoder_CheckRequired(d, ptr, msg, layout)
: ptr;
}
const char* _upb_FastDecoder_DecodeGeneric(struct upb_Decoder* d,
const char* ptr, upb_Message* msg,
intptr_t table, uint64_t hasbits,
uint64_t data) {
(void)data;
*(uint32_t*)msg |= hasbits;
return _upb_Decoder_DecodeMessage(d, ptr, msg, decode_totablep(table));
}
static upb_DecodeStatus _upb_Decoder_DecodeTop(struct upb_Decoder* d,
const char* buf, void* msg,
const upb_MiniTable* l) {
if (!_upb_Decoder_TryFastDispatch(d, &buf, msg, l)) {
_upb_Decoder_DecodeMessage(d, buf, msg, l);
}
if (d->end_group != DECODE_NOGROUP) return kUpb_DecodeStatus_Malformed;
if (d->missing_required) return kUpb_DecodeStatus_MissingRequired;
return kUpb_DecodeStatus_Ok;
}
upb_DecodeStatus upb_Decode(const char* buf, size_t size, void* msg,
const upb_MiniTable* l,
const upb_ExtensionRegistry* extreg, int options,
upb_Arena* arena) {
upb_Decoder state;
unsigned depth = (unsigned)options >> 16;
if (size <= 16) {
memset(&state.patch, 0, 32);
if (size) memcpy(&state.patch, buf, size);
buf = state.patch;
state.end = buf + size;
state.limit = 0;
options &= ~kUpb_DecodeOption_AliasString; // Can't alias patch buf.
} else {
state.end = buf + size - 16;
state.limit = 16;
}
state.extreg = extreg;
state.limit_ptr = state.end;
state.unknown = NULL;
state.depth = depth ? depth : 64;
state.end_group = DECODE_NOGROUP;
state.options = (uint16_t)options;
state.missing_required = false;
state.arena.head = arena->head;
state.arena.last_size = arena->last_size;
state.arena.cleanup_metadata = arena->cleanup_metadata;
state.arena.parent = arena;
upb_DecodeStatus status = UPB_SETJMP(state.err);
if (UPB_LIKELY(status == kUpb_DecodeStatus_Ok)) {
status = _upb_Decoder_DecodeTop(&state, buf, msg, l);
}
arena->head.ptr = state.arena.head.ptr;
arena->head.end = state.arena.head.end;
arena->cleanup_metadata = state.arena.cleanup_metadata;
return status;
}
#undef OP_UNKNOWN
#undef OP_SKIP
#undef OP_SCALAR_LG2
#undef OP_FIXPCK_LG2
#undef OP_VARPCK_LG2
#undef OP_STRING
#undef OP_BYTES
#undef OP_SUBMSG