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Simplify pass: one error channel in the inflate loop, whole-window flushes where acks go out on receipt, shared log helpers, one backend alias, leaner tests

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This commit is contained in:
J. Nick Koston
2026-09-08 13:48:58 +02:00
parent 87dc5014a8
commit 773050d7c9
7 changed files with 67 additions and 86 deletions
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tests/components/esphome/test_ota_inflate.cpp
+22 -24
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@@ -209,16 +209,20 @@ static const uint8_t STORED[] = {
static constexpr size_t WINDOW = 4096;
static constexpr size_t PLAIN_SIZE = 16000;
// Pseudo random bytes reproducible from Python for the vectors above
static uint8_t lcg_next(uint32_t &x) {
x = (x * 1103515245u + 12345u) & 0x7fffffffu;
return (x >> 16) & 0xff;
}
static std::vector<uint8_t> build_plain() {
std::vector<uint8_t> plain;
const char *text = "esphome ota deflate ";
for (int i = 0; i < 300; i++)
plain.insert(plain.end(), text, text + strlen(text));
uint32_t x = 1;
for (int i = 0; i < 3000; i++) {
x = (x * 1103515245u + 12345u) & 0x7fffffffu;
plain.push_back((x >> 16) & 0xff);
}
for (int i = 0; i < 3000; i++)
plain.push_back(lcg_next(x));
plain.insert(plain.end(), 5000, 0);
for (int i = 0; i < 100; i++)
plain.insert(plain.end(), text, text + strlen(text));
@@ -233,7 +237,6 @@ struct Session : OtaInflateState {
size_t in_pos;
size_t chunk;
std::vector<uint8_t> out;
size_t out_limit;
uint8_t window[WINDOW];
};
@@ -249,13 +252,12 @@ static int read_cb(OtaInflateState *d) {
}
// Inflates the whole input; returns the decoder result and fills s.out
static int inflate_all(Session &s, const uint8_t *in, size_t in_len, size_t chunk, size_t out_limit) {
static int inflate_all(Session &s, const uint8_t *in, size_t in_len, size_t chunk) {
s.in = in;
s.in_len = in_len;
s.in_pos = 0;
s.chunk = chunk;
s.out.clear();
s.out_limit = out_limit;
memset(s.window, 0, sizeof(s.window));
ota_inflate_init(&s, s.window, WINDOW);
s.source_read_cb = read_cb;
@@ -267,7 +269,7 @@ static int inflate_all(Session &s, const uint8_t *in, size_t in_len, size_t chun
if (res < 0 || s.eof)
return res < 0 ? res : OTA_INFLATE_DATA_ERROR;
s.out.insert(s.out.end(), s.window, s.dest);
if (s.out.size() > s.out_limit)
if (s.out.size() > PLAIN_SIZE)
return OTA_INFLATE_DATA_ERROR;
} while (res != OTA_INFLATE_DONE);
return res;
@@ -275,20 +277,20 @@ static int inflate_all(Session &s, const uint8_t *in, size_t in_len, size_t chun
TEST(OtaInflate, RoundTripThroughWindow) {
auto s = std::make_unique<Session>();
ASSERT_EQ(inflate_all(*s, DEFLATED, sizeof(DEFLATED), 1040, PLAIN_SIZE), OTA_INFLATE_DONE);
ASSERT_EQ(inflate_all(*s, DEFLATED, sizeof(DEFLATED), 1040), OTA_INFLATE_DONE);
EXPECT_EQ(s->out, build_plain());
EXPECT_EQ(s->in_pos, sizeof(DEFLATED));
}
TEST(OtaInflate, SmallReadChunks) {
auto s = std::make_unique<Session>();
ASSERT_EQ(inflate_all(*s, DEFLATED, sizeof(DEFLATED), 7, PLAIN_SIZE), OTA_INFLATE_DONE);
ASSERT_EQ(inflate_all(*s, DEFLATED, sizeof(DEFLATED), 7), OTA_INFLATE_DONE);
EXPECT_EQ(s->out, build_plain());
}
TEST(OtaInflate, StoredBlock) {
auto s = std::make_unique<Session>();
ASSERT_EQ(inflate_all(*s, STORED, sizeof(STORED), 64, PLAIN_SIZE), OTA_INFLATE_DONE);
ASSERT_EQ(inflate_all(*s, STORED, sizeof(STORED), 64), OTA_INFLATE_DONE);
auto plain = build_plain();
plain.resize(300);
EXPECT_EQ(s->out, plain);
@@ -297,37 +299,33 @@ TEST(OtaInflate, StoredBlock) {
TEST(OtaInflate, TruncatedStreamFails) {
auto s = std::make_unique<Session>();
for (size_t cut : {size_t{1}, size_t{100}, size_t{1000}, sizeof(DEFLATED) - 1}) {
EXPECT_LT(inflate_all(*s, DEFLATED, cut, 1040, PLAIN_SIZE), 0) << "cut at " << cut;
EXPECT_LT(inflate_all(*s, DEFLATED, cut, 1040), 0) << "cut at " << cut;
EXPECT_LE(s->out.size(), PLAIN_SIZE);
}
}
TEST(OtaInflate, TruncatedStoredBlockFails) {
auto s = std::make_unique<Session>();
EXPECT_LT(inflate_all(*s, STORED, sizeof(STORED) - 50, 64, PLAIN_SIZE), 0);
EXPECT_LT(inflate_all(*s, STORED, sizeof(STORED) - 50, 64), 0);
}
TEST(OtaInflate, CorruptStreamsNeverEscapeTheWindow) {
// Every byte of the stream flipped in turn, plus pseudo random garbage: the
// decoder must fail or finish without ever reading or writing out of bounds
// (the sanitizers check that) and without producing more than announced.
// Every third byte of the stream flipped in turn, plus pseudo random garbage:
// the sanitizers check that the decoder never reads or writes out of bounds
// whatever it returns.
auto s = std::make_unique<Session>();
std::vector<uint8_t> bad(DEFLATED, DEFLATED + sizeof(DEFLATED));
for (size_t i = 0; i < bad.size(); i += 3) {
bad[i] ^= 0x5a;
int res = inflate_all(*s, bad.data(), bad.size(), 1040, PLAIN_SIZE);
EXPECT_TRUE(res < 0 || res == OTA_INFLATE_DONE);
inflate_all(*s, bad.data(), bad.size(), 1040);
bad[i] ^= 0x5a;
}
uint32_t x = 99;
std::vector<uint8_t> garbage(2000);
for (int round = 0; round < 50; round++) {
for (auto &b : garbage) {
x = (x * 1103515245u + 12345u) & 0x7fffffffu;
b = (x >> 16) & 0xff;
}
int res = inflate_all(*s, garbage.data(), garbage.size(), 1040, PLAIN_SIZE);
EXPECT_TRUE(res < 0 || res == OTA_INFLATE_DONE);
for (auto &b : garbage)
b = lcg_next(x);
inflate_all(*s, garbage.data(), garbage.size(), 1040);
}
}