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Hide the byte stuffer state inside it

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This commit is contained in:
Fred Sundvik 2016-02-17 09:07:38 +02:00
parent 8d50880686
commit 419908e5ef
3 changed files with 117 additions and 117 deletions
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52
serial_link/protocol/byte_stuffer.c
View File

@ -40,56 +40,58 @@ typedef struct byte_stuffer_state {
uint8_t data[MAX_FRAME_SIZE]; uint8_t data[MAX_FRAME_SIZE];
}byte_stuffer_state_t; }byte_stuffer_state_t;
void init_byte_stuffer_state(byte_stuffer_state_t* state) { static byte_stuffer_state_t state;
state->next_zero = 0;
state->data_pos = 0; void init_byte_stuffer(void) {
state->long_frame = false; state.next_zero = 0;
state.data_pos = 0;
state.long_frame = false;
} }
void recv_byte(byte_stuffer_state_t* state, uint8_t data) { void recv_byte(uint8_t data) {
// Start of a new frame // Start of a new frame
if (state->next_zero == 0) { if (state.next_zero == 0) {
state->next_zero = data; state.next_zero = data;
state->long_frame = data == 0xFF; state.long_frame = data == 0xFF;
state->data_pos = 0; state.data_pos = 0;
return; return;
} }
state->next_zero--; state.next_zero--;
if (data == 0) { if (data == 0) {
if (state->next_zero == 0) { if (state.next_zero == 0) {
// The frame is completed // The frame is completed
if (state->data_pos > 0) { if (state.data_pos > 0) {
validator_recv_frame(state->data, state->data_pos); validator_recv_frame(state.data, state.data_pos);
} }
} }
else { else {
// The frame is invalid, so reset // The frame is invalid, so reset
init_byte_stuffer_state(state); init_byte_stuffer();
} }
} }
else { else {
if (state->data_pos == MAX_FRAME_SIZE) { if (state.data_pos == MAX_FRAME_SIZE) {
// We exceeded our maximum frame size // We exceeded our maximum frame size
// therefore there's nothing else to do than reset to a new frame // therefore there's nothing else to do than reset to a new frame
state->next_zero = data; state.next_zero = data;
state->long_frame = data == 0xFF; state.long_frame = data == 0xFF;
state->data_pos = 0; state.data_pos = 0;
} }
else if (state->next_zero == 0) { else if (state.next_zero == 0) {
if (state->long_frame) { if (state.long_frame) {
// This is part of a long frame, so continue // This is part of a long frame, so continue
state->next_zero = data; state.next_zero = data;
state->long_frame = data == 0xFF; state.long_frame = data == 0xFF;
} }
else { else {
// Special case for zeroes // Special case for zeroes
state->next_zero = data; state.next_zero = data;
state->data[state->data_pos++] = 0; state.data[state.data_pos++] = 0;
} }
} }
else { else {
state->data[state->data_pos++] = data; state.data[state.data_pos++] = data;
} }
} }
} }

5
serial_link/protocol/byte_stuffer.h
View File

@ -22,7 +22,6 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE. SOFTWARE.
*/ */
typedef struct byte_stuffer_state byte_stuffer_state_t; void init_byte_stuffer(void);
void init_byte_stuffer_state(byte_stuffer_state_t* state); void recv_byte(uint8_t data);
void recv_byte(byte_stuffer_state_t* state, uint8_t data);
void send_frame(uint8_t* data, uint16_t size); void send_frame(uint8_t* data, uint16_t size);

177
serial_link/tests/byte_stuffer_tests.c
View File

@ -29,13 +29,12 @@ SOFTWARE.
#include "protocol/frame_validator.h" #include "protocol/frame_validator.h"
#include "protocol/physical.h" #include "protocol/physical.h"
static byte_stuffer_state_t state;
static uint8_t sent_data[MAX_FRAME_SIZE*2]; static uint8_t sent_data[MAX_FRAME_SIZE*2];
static uint16_t sent_data_size; static uint16_t sent_data_size;
Describe(ByteStuffer); Describe(ByteStuffer);
BeforeEach(ByteStuffer) { BeforeEach(ByteStuffer) {
init_byte_stuffer_state(&state); init_byte_stuffer();
sent_data_size = 0; sent_data_size = 0;
} }
AfterEach(ByteStuffer) {} AfterEach(ByteStuffer) {}
@ -51,23 +50,23 @@ void send_data(const uint8_t* data, uint16_t size) {
Ensure(ByteStuffer, receives_no_frame_for_a_single_zero_byte) { Ensure(ByteStuffer, receives_no_frame_for_a_single_zero_byte) {
never_expect(validator_recv_frame); never_expect(validator_recv_frame);
recv_byte(&state, 0); recv_byte(0);
} }
Ensure(ByteStuffer, receives_no_frame_for_a_single_FF_byte) { Ensure(ByteStuffer, receives_no_frame_for_a_single_FF_byte) {
never_expect(validator_recv_frame); never_expect(validator_recv_frame);
recv_byte(&state, 0xFF); recv_byte(0xFF);
} }
Ensure(ByteStuffer, receives_no_frame_for_a_single_random_byte) { Ensure(ByteStuffer, receives_no_frame_for_a_single_random_byte) {
never_expect(validator_recv_frame); never_expect(validator_recv_frame);
recv_byte(&state, 0x4A); recv_byte(0x4A);
} }
Ensure(ByteStuffer, receives_no_frame_for_a_zero_length_frame) { Ensure(ByteStuffer, receives_no_frame_for_a_zero_length_frame) {
never_expect(validator_recv_frame); never_expect(validator_recv_frame);
recv_byte(&state, 1); recv_byte(1);
recv_byte(&state, 0); recv_byte(0);
} }
Ensure(ByteStuffer, receives_single_byte_valid_frame) { Ensure(ByteStuffer, receives_single_byte_valid_frame) {
@ -76,9 +75,9 @@ Ensure(ByteStuffer, receives_single_byte_valid_frame) {
when(size, is_equal_to(1)), when(size, is_equal_to(1)),
when(data, is_equal_to_contents_of(expected, 1)) when(data, is_equal_to_contents_of(expected, 1))
); );
recv_byte(&state, 2); recv_byte(2);
recv_byte(&state, 0x37); recv_byte(0x37);
recv_byte(&state, 0); recv_byte(0);
} }
Ensure(ByteStuffer, receives_three_bytes_valid_frame) { Ensure(ByteStuffer, receives_three_bytes_valid_frame) {
@ -87,11 +86,11 @@ Ensure(ByteStuffer, receives_three_bytes_valid_frame) {
when(size, is_equal_to(3)), when(size, is_equal_to(3)),
when(data, is_equal_to_contents_of(expected, 3)) when(data, is_equal_to_contents_of(expected, 3))
); );
recv_byte(&state, 4); recv_byte(4);
recv_byte(&state, 0x37); recv_byte(0x37);
recv_byte(&state, 0x99); recv_byte(0x99);
recv_byte(&state, 0xFF); recv_byte(0xFF);
recv_byte(&state, 0); recv_byte(0);
} }
Ensure(ByteStuffer, receives_single_zero_valid_frame) { Ensure(ByteStuffer, receives_single_zero_valid_frame) {
@ -100,9 +99,9 @@ Ensure(ByteStuffer, receives_single_zero_valid_frame) {
when(size, is_equal_to(1)), when(size, is_equal_to(1)),
when(data, is_equal_to_contents_of(expected, 1)) when(data, is_equal_to_contents_of(expected, 1))
); );
recv_byte(&state, 1); recv_byte(1);
recv_byte(&state, 1); recv_byte(1);
recv_byte(&state, 0); recv_byte(0);
} }
Ensure(ByteStuffer, receives_valid_frame_with_zeroes) { Ensure(ByteStuffer, receives_valid_frame_with_zeroes) {
@ -111,12 +110,12 @@ Ensure(ByteStuffer, receives_valid_frame_with_zeroes) {
when(size, is_equal_to(4)), when(size, is_equal_to(4)),
when(data, is_equal_to_contents_of(expected, 4)) when(data, is_equal_to_contents_of(expected, 4))
); );
recv_byte(&state, 2); recv_byte(2);
recv_byte(&state, 5); recv_byte(5);
recv_byte(&state, 2); recv_byte(2);
recv_byte(&state, 3); recv_byte(3);
recv_byte(&state, 1); recv_byte(1);
recv_byte(&state, 0); recv_byte(0);
} }
Ensure(ByteStuffer, receives_two_valid_frames) { Ensure(ByteStuffer, receives_two_valid_frames) {
@ -130,13 +129,13 @@ Ensure(ByteStuffer, receives_two_valid_frames) {
when(size, is_equal_to(1)), when(size, is_equal_to(1)),
when(data, is_equal_to_contents_of(expected2, 1)) when(data, is_equal_to_contents_of(expected2, 1))
); );
recv_byte(&state, 2); recv_byte(2);
recv_byte(&state, 5); recv_byte(5);
recv_byte(&state, 1); recv_byte(1);
recv_byte(&state, 0); recv_byte(0);
recv_byte(&state, 2); recv_byte(2);
recv_byte(&state, 3); recv_byte(3);
recv_byte(&state, 0); recv_byte(0);
} }
Ensure(ByteStuffer, receives_valid_frame_after_unexpected_zero) { Ensure(ByteStuffer, receives_valid_frame_after_unexpected_zero) {
@ -145,13 +144,13 @@ Ensure(ByteStuffer, receives_valid_frame_after_unexpected_zero) {
when(size, is_equal_to(2)), when(size, is_equal_to(2)),
when(data, is_equal_to_contents_of(expected, 2)) when(data, is_equal_to_contents_of(expected, 2))
); );
recv_byte(&state, 3); recv_byte(3);
recv_byte(&state, 1); recv_byte(1);
recv_byte(&state, 0); recv_byte(0);
recv_byte(&state, 3); recv_byte(3);
recv_byte(&state, 5); recv_byte(5);
recv_byte(&state, 7); recv_byte(7);
recv_byte(&state, 0); recv_byte(0);
} }
Ensure(ByteStuffer, receives_valid_frame_after_unexpected_non_zero) { Ensure(ByteStuffer, receives_valid_frame_after_unexpected_non_zero) {
@ -160,14 +159,14 @@ Ensure(ByteStuffer, receives_valid_frame_after_unexpected_non_zero) {
when(size, is_equal_to(2)), when(size, is_equal_to(2)),
when(data, is_equal_to_contents_of(expected, 2)) when(data, is_equal_to_contents_of(expected, 2))
); );
recv_byte(&state, 2); recv_byte(2);
recv_byte(&state, 9); recv_byte(9);
recv_byte(&state, 4); // This should have been zero recv_byte(4); // This should have been zero
recv_byte(&state, 0); recv_byte(0);
recv_byte(&state, 3); recv_byte(3);
recv_byte(&state, 5); recv_byte(5);
recv_byte(&state, 7); recv_byte(7);
recv_byte(&state, 0); recv_byte(0);
} }
Ensure(ByteStuffer, receives_a_valid_frame_with_over254_non_zeroes_and_then_end_of_frame) { Ensure(ByteStuffer, receives_a_valid_frame_with_over254_non_zeroes_and_then_end_of_frame) {
@ -180,11 +179,11 @@ Ensure(ByteStuffer, receives_a_valid_frame_with_over254_non_zeroes_and_then_end_
when(size, is_equal_to(254)), when(size, is_equal_to(254)),
when(data, is_equal_to_contents_of(expected, 254)) when(data, is_equal_to_contents_of(expected, 254))
); );
recv_byte(&state, 0xFF); recv_byte(0xFF);
for (i=0;i<254;i++) { for (i=0;i<254;i++) {
recv_byte(&state, i+1); recv_byte(i+1);
} }
recv_byte(&state, 0); recv_byte(0);
} }
Ensure(ByteStuffer, receives_a_valid_frame_with_over254_non_zeroes_next_byte_is_non_zero) { Ensure(ByteStuffer, receives_a_valid_frame_with_over254_non_zeroes_next_byte_is_non_zero) {
@ -198,13 +197,13 @@ Ensure(ByteStuffer, receives_a_valid_frame_with_over254_non_zeroes_next_byte_is_
when(size, is_equal_to(255)), when(size, is_equal_to(255)),
when(data, is_equal_to_contents_of(expected, 255)) when(data, is_equal_to_contents_of(expected, 255))
); );
recv_byte(&state, 0xFF); recv_byte(0xFF);
for (i=0;i<254;i++) { for (i=0;i<254;i++) {
recv_byte(&state, i+1); recv_byte(i+1);
} }
recv_byte(&state, 2); recv_byte(2);
recv_byte(&state, 7); recv_byte(7);
recv_byte(&state, 0); recv_byte(0);
} }
Ensure(ByteStuffer, receives_a_valid_frame_with_over254_non_zeroes_next_byte_is_zero) { Ensure(ByteStuffer, receives_a_valid_frame_with_over254_non_zeroes_next_byte_is_zero) {
@ -218,13 +217,13 @@ Ensure(ByteStuffer, receives_a_valid_frame_with_over254_non_zeroes_next_byte_is_
when(size, is_equal_to(255)), when(size, is_equal_to(255)),
when(data, is_equal_to_contents_of(expected, 255)) when(data, is_equal_to_contents_of(expected, 255))
); );
recv_byte(&state, 0xFF); recv_byte(0xFF);
for (i=0;i<254;i++) { for (i=0;i<254;i++) {
recv_byte(&state, i+1); recv_byte(i+1);
} }
recv_byte(&state, 1); recv_byte(1);
recv_byte(&state, 1); recv_byte(1);
recv_byte(&state, 0); recv_byte(0);
} }
Ensure(ByteStuffer, receives_two_long_frames_and_some_more) { Ensure(ByteStuffer, receives_two_long_frames_and_some_more) {
@ -243,23 +242,23 @@ Ensure(ByteStuffer, receives_two_long_frames_and_some_more) {
when(size, is_equal_to(515)), when(size, is_equal_to(515)),
when(data, is_equal_to_contents_of(expected, 510)) when(data, is_equal_to_contents_of(expected, 510))
); );
recv_byte(&state, 0xFF); recv_byte(0xFF);
for (i=0;i<254;i++) { for (i=0;i<254;i++) {
recv_byte(&state, i+1); recv_byte(i+1);
} }
recv_byte(&state, 0xFF); recv_byte(0xFF);
for (i=0;i<254;i++) { for (i=0;i<254;i++) {
recv_byte(&state, i+1); recv_byte(i+1);
} }
recv_byte(&state, 8); recv_byte(8);
recv_byte(&state, 1); recv_byte(1);
recv_byte(&state, 2); recv_byte(2);
recv_byte(&state, 3); recv_byte(3);
recv_byte(&state, 4); recv_byte(4);
recv_byte(&state, 5); recv_byte(5);
recv_byte(&state, 6); recv_byte(6);
recv_byte(&state, 7); recv_byte(7);
recv_byte(&state, 0); recv_byte(0);
} }
Ensure(ByteStuffer, receives_an_all_zeros_frame_that_is_maximum_size) { Ensure(ByteStuffer, receives_an_all_zeros_frame_that_is_maximum_size) {
@ -269,23 +268,23 @@ Ensure(ByteStuffer, receives_an_all_zeros_frame_that_is_maximum_size) {
when(data, is_equal_to_contents_of(expected, MAX_FRAME_SIZE)) when(data, is_equal_to_contents_of(expected, MAX_FRAME_SIZE))
); );
int i; int i;
recv_byte(&state, 1); recv_byte(1);
for(i=0;i<MAX_FRAME_SIZE;i++) { for(i=0;i<MAX_FRAME_SIZE;i++) {
recv_byte(&state, 1); recv_byte(1);
} }
recv_byte(&state, 0); recv_byte(0);
} }
Ensure(ByteStuffer, doesnt_recv_a_frame_thats_too_long_all_zeroes) { Ensure(ByteStuffer, doesnt_recv_a_frame_thats_too_long_all_zeroes) {
uint8_t expected[1] = {0}; uint8_t expected[1] = {0};
never_expect(validator_recv_frame); never_expect(validator_recv_frame);
int i; int i;
recv_byte(&state, 1); recv_byte(1);
for(i=0;i<MAX_FRAME_SIZE;i++) { for(i=0;i<MAX_FRAME_SIZE;i++) {
recv_byte(&state, 1); recv_byte(1);
} }
recv_byte(&state, 1); recv_byte(1);
recv_byte(&state, 0); recv_byte(0);
} }
Ensure(ByteStuffer, received_frame_is_aborted_when_its_too_long) { Ensure(ByteStuffer, received_frame_is_aborted_when_its_too_long) {
@ -295,13 +294,13 @@ Ensure(ByteStuffer, received_frame_is_aborted_when_its_too_long) {
when(data, is_equal_to_contents_of(expected, 1)) when(data, is_equal_to_contents_of(expected, 1))
); );
int i; int i;
recv_byte(&state, 1); recv_byte(1);
for(i=0;i<MAX_FRAME_SIZE;i++) { for(i=0;i<MAX_FRAME_SIZE;i++) {
recv_byte(&state, 1); recv_byte(1);
} }
recv_byte(&state, 2); recv_byte(2);
recv_byte(&state, 1); recv_byte(1);
recv_byte(&state, 0); recv_byte(0);
} }
Ensure(ByteStuffer, does_nothing_when_sending_zero_size_frame) { Ensure(ByteStuffer, does_nothing_when_sending_zero_size_frame) {
@ -438,7 +437,7 @@ Ensure(ByteStuffer, sends_and_receives_full_roundtrip_small_packet) {
); );
int i; int i;
for(i=0;i<sent_data_size;i++) { for(i=0;i<sent_data_size;i++) {
recv_byte(&state, sent_data[i]); recv_byte(sent_data[i]);
} }
} }
@ -451,7 +450,7 @@ Ensure(ByteStuffer, sends_and_receives_full_roundtrip_small_packet_with_zeros) {
); );
int i; int i;
for(i=0;i<sent_data_size;i++) { for(i=0;i<sent_data_size;i++) {
recv_byte(&state, sent_data[i]); recv_byte(sent_data[i]);
} }
} }
@ -467,7 +466,7 @@ Ensure(ByteStuffer, sends_and_receives_full_roundtrip_254_bytes) {
when(data, is_equal_to_contents_of(original_data, sizeof(original_data))) when(data, is_equal_to_contents_of(original_data, sizeof(original_data)))
); );
for(i=0;i<sent_data_size;i++) { for(i=0;i<sent_data_size;i++) {
recv_byte(&state, sent_data[i]); recv_byte(sent_data[i]);
} }
} }
@ -485,7 +484,7 @@ Ensure(ByteStuffer, sends_and_receives_full_roundtrip_256_bytes) {
when(data, is_equal_to_contents_of(original_data, sizeof(original_data))) when(data, is_equal_to_contents_of(original_data, sizeof(original_data)))
); );
for(i=0;i<sent_data_size;i++) { for(i=0;i<sent_data_size;i++) {
recv_byte(&state, sent_data[i]); recv_byte(sent_data[i]);
} }
} }
@ -502,6 +501,6 @@ Ensure(ByteStuffer, sends_and_receives_full_roundtrip_254_bytes_and_then_zero) {
when(data, is_equal_to_contents_of(original_data, sizeof(original_data))) when(data, is_equal_to_contents_of(original_data, sizeof(original_data)))
); );
for(i=0;i<sent_data_size;i++) { for(i=0;i<sent_data_size;i++) {
recv_byte(&state, sent_data[i]); recv_byte(sent_data[i]);
} }
} }