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This commit is contained in:
J. Nick Koston
2026-04-01 22:30:48 -10:00
parent cdf1adaa39
commit ebefe76362
1 changed files with 7 additions and 2 deletions
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esphome/components/api/api_frame_helper_plaintext.cpp
+7 -2
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@@ -309,8 +309,8 @@ APIError APIPlaintextFrameHelper::write_protobuf_messages(ProtoWriteBuffer buffe
// Compute first message's write position from header length (cheap arithmetic, no buffer writes). // Compute first message's write position from header length (cheap arithmetic, no buffer writes).
// This lets the loop body skip a nullptr check — first iteration has src == write_end naturally. // This lets the loop body skip a nullptr check — first iteration has src == write_end naturally.
uint8_t *write_start = buffer_data + messages[0].offset + HEADER_PADDING - plaintext_header_length(messages[0]); uint8_t *write_start = nullptr;
uint8_t *write_end = write_start; uint8_t *write_end = nullptr;
// Write headers and compact messages to close 0-3 byte varint padding gaps. // Write headers and compact messages to close 0-3 byte varint padding gaps.
// First iteration: src == write_end so memmove is skipped. // First iteration: src == write_end so memmove is skipped.
@@ -318,6 +318,11 @@ APIError APIPlaintextFrameHelper::write_protobuf_messages(ProtoWriteBuffer buffe
uint8_t header_len = write_plaintext_header(buffer_data + msg.offset, msg); uint8_t header_len = write_plaintext_header(buffer_data + msg.offset, msg);
uint8_t *src = buffer_data + msg.offset + HEADER_PADDING - header_len; uint8_t *src = buffer_data + msg.offset + HEADER_PADDING - header_len;
uint16_t msg_len = header_len + msg.payload_size; uint16_t msg_len = header_len + msg.payload_size;
if (write_start == nullptr) {
write_start = src;
write_end = src + msg_len;
continue;
}
if (src != write_end) { if (src != write_end) {
memmove(write_end, src, msg_len); memmove(write_end, src, msg_len);
} }