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Zero-copy encode: pack response body in place, single shared tx_buf, drain rx loop

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This commit is contained in:
Ian Gulliver
2026-04-10 22:48:28 +09:00
parent 58db392bf3
commit 8408603390
8 changed files with 98 additions and 57 deletions
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11
firmware/include/halfsiphash.h
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@@ -1,6 +1,7 @@
#pragma once
#include <cstdint>
#include <cstddef>
#include <span>
namespace halfsiphash {
@@ -34,7 +35,7 @@ inline void sipround(uint32_t &v0, uint32_t &v1, uint32_t &v2, uint32_t &v3) {
} // namespace detail
// Compute HalfSipHash-2-4 with an 8-byte key, returning a 32-bit hash.
inline uint32_t hash32(const uint8_t *data, size_t len, const uint8_t key[8]) {
inline uint32_t hash32(std::span<const uint8_t> data, const uint8_t key[8]) {
using namespace detail;
uint32_t k0 = load_le32(key);
@@ -45,8 +46,8 @@ inline uint32_t hash32(const uint8_t *data, size_t len, const uint8_t key[8]) {
uint32_t v2 = UINT32_C(0x6c796765) ^ k0;
uint32_t v3 = UINT32_C(0x74656462) ^ k1;
const uint8_t *end = data + len - (len % 4);
for (const uint8_t *p = data; p != end; p += 4) {
const uint8_t *end = data.data() + data.size() - (data.size() % 4);
for (const uint8_t *p = data.data(); p != end; p += 4) {
uint32_t m = load_le32(p);
v3 ^= m;
sipround(v0, v1, v2, v3);
@@ -54,8 +55,8 @@ inline uint32_t hash32(const uint8_t *data, size_t len, const uint8_t key[8]) {
v0 ^= m;
}
uint32_t b = static_cast<uint32_t>(len) << 24;
switch (len & 3) {
uint32_t b = static_cast<uint32_t>(data.size()) << 24;
switch (data.size() & 3) {
case 3: b |= static_cast<uint32_t>(end[2]) << 16; [[fallthrough]];
case 2: b |= static_cast<uint32_t>(end[1]) << 8; [[fallthrough]];
case 1: b |= static_cast<uint32_t>(end[0]); break;