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Small optimizations to api buffer helper (#9071)

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J. Nick Koston 2025-06-14 21:55:03 -05:00 committed by GitHub
parent 374c33e8dc
commit a1e4143600
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1 changed files with 17 additions and 23 deletions
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40
esphome/components/api/api_connection.h
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@ -240,8 +240,8 @@ class APIConnection : public APIServerConnection {
// - Header padding: space for protocol headers (7 bytes for Noise, 6 for Plaintext)
// - Footer: space for MAC (16 bytes for Noise, 0 for Plaintext)
shared_buf.reserve(reserve_size + header_padding + this->helper_->frame_footer_size());
// Insert header padding bytes so message encoding starts at the correct position
shared_buf.insert(shared_buf.begin(), header_padding, 0);
// Resize to add header padding so message encoding starts at the correct position
shared_buf.resize(header_padding);
return {&shared_buf};
}
@ -249,32 +249,26 @@ class APIConnection : public APIServerConnection {
ProtoWriteBuffer prepare_message_buffer(uint16_t message_size, bool is_first_message) {
// Get reference to shared buffer (it maintains state between batch messages)
std::vector<uint8_t> &shared_buf = this->parent_->get_shared_buffer_ref();
size_t current_size = shared_buf.size();
if (is_first_message) {
// For first message, initialize buffer with header padding
uint8_t header_padding = this->helper_->frame_header_padding();
shared_buf.clear();
shared_buf.reserve(message_size + header_padding);
shared_buf.resize(header_padding);
// Fill header padding with zeros
std::fill(shared_buf.begin(), shared_buf.end(), 0);
} else {
// For subsequent messages, add footer space for previous message and header for this message
uint8_t footer_size = this->helper_->frame_footer_size();
uint8_t header_padding = this->helper_->frame_header_padding();
// Reserve additional space for everything
shared_buf.reserve(current_size + footer_size + header_padding + message_size);
// Single resize to add both footer and header padding
size_t new_size = current_size + footer_size + header_padding;
shared_buf.resize(new_size);
// Fill the newly added bytes with zeros (footer + header padding)
std::fill(shared_buf.begin() + current_size, shared_buf.end(), 0);
}
size_t current_size = shared_buf.size();
// Calculate padding to add:
// - First message: just header padding
// - Subsequent messages: footer for previous message + header padding for this message
size_t padding_to_add = is_first_message
? this->helper_->frame_header_padding()
: this->helper_->frame_header_padding() + this->helper_->frame_footer_size();
// Reserve space for padding + message
shared_buf.reserve(current_size + padding_to_add + message_size);
// Resize to add the padding bytes
shared_buf.resize(current_size + padding_to_add);
return {&shared_buf};
}