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[api] Optimize protobuf decode loop for better performance and maintainability

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This commit is contained in:
J. Nick Koston
2025-08-17 22:21:51 -05:00
parent daf8ec36ab
commit a2ad2dd10e
1 changed files with 33 additions and 37 deletions
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70
esphome/components/api/proto.cpp
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@@ -8,74 +8,70 @@ namespace esphome::api {
static const char *const TAG = "api.proto";
void ProtoDecodableMessage::decode(const uint8_t *buffer, size_t length) {
uint32_t i = 0;
bool error = false;
while (i < length) {
const uint8_t *ptr = buffer;
const uint8_t *end = buffer + length;
while (ptr < end) {
uint32_t consumed;
auto res = ProtoVarInt::parse(&buffer[i], length - i, &consumed);
// Parse field header
auto res = ProtoVarInt::parse(ptr, end - ptr, &consumed);
if (!res.has_value()) {
ESP_LOGV(TAG, "Invalid field start at %" PRIu32, i);
break;
ESP_LOGV(TAG, "Invalid field start at offset %td", ptr - buffer);
return;
}
uint32_t field_type = (res->as_uint32()) & 0b111;
uint32_t field_id = (res->as_uint32()) >> 3;
i += consumed;
uint32_t tag = res->as_uint32();
uint32_t field_type = tag & 0b111;
uint32_t field_id = tag >> 3;
ptr += consumed;
switch (field_type) {
case 0: { // VarInt
res = ProtoVarInt::parse(&buffer[i], length - i, &consumed);
res = ProtoVarInt::parse(ptr, end - ptr, &consumed);
if (!res.has_value()) {
ESP_LOGV(TAG, "Invalid VarInt at %" PRIu32, i);
error = true;
break;
ESP_LOGV(TAG, "Invalid VarInt at offset %td", ptr - buffer);
return;
}
if (!this->decode_varint(field_id, *res)) {
ESP_LOGV(TAG, "Cannot decode VarInt field %" PRIu32 " with value %" PRIu32 "!", field_id, res->as_uint32());
}
i += consumed;
ptr += consumed;
break;
}
case 2: { // Length-delimited
res = ProtoVarInt::parse(&buffer[i], length - i, &consumed);
res = ProtoVarInt::parse(ptr, end - ptr, &consumed);
if (!res.has_value()) {
ESP_LOGV(TAG, "Invalid Length Delimited at %" PRIu32, i);
error = true;
break;
ESP_LOGV(TAG, "Invalid Length Delimited at offset %td", ptr - buffer);
return;
}
uint32_t field_length = res->as_uint32();
i += consumed;
if (field_length > length - i) {
ESP_LOGV(TAG, "Out-of-bounds Length Delimited at %" PRIu32, i);
error = true;
break;
ptr += consumed;
if (ptr + field_length > end) {
ESP_LOGV(TAG, "Out-of-bounds Length Delimited at offset %td", ptr - buffer);
return;
}
if (!this->decode_length(field_id, ProtoLengthDelimited(&buffer[i], field_length))) {
if (!this->decode_length(field_id, ProtoLengthDelimited(ptr, field_length))) {
ESP_LOGV(TAG, "Cannot decode Length Delimited field %" PRIu32 "!", field_id);
}
i += field_length;
ptr += field_length;
break;
}
case 5: { // 32-bit
if (length - i < 4) {
ESP_LOGV(TAG, "Out-of-bounds Fixed32-bit at %" PRIu32, i);
error = true;
break;
if (ptr + 4 > end) {
ESP_LOGV(TAG, "Out-of-bounds Fixed32-bit at offset %td", ptr - buffer);
return;
}
uint32_t val = encode_uint32(buffer[i + 3], buffer[i + 2], buffer[i + 1], buffer[i]);
uint32_t val = encode_uint32(ptr[3], ptr[2], ptr[1], ptr[0]);
if (!this->decode_32bit(field_id, Proto32Bit(val))) {
ESP_LOGV(TAG, "Cannot decode 32-bit field %" PRIu32 " with value %" PRIu32 "!", field_id, val);
}
i += 4;
ptr += 4;
break;
}
default:
ESP_LOGV(TAG, "Invalid field type at %" PRIu32, i);
error = true;
break;
}
if (error) {
break;
ESP_LOGV(TAG, "Invalid field type %u at offset %td", field_type, ptr - buffer);
return;
}
}
}