int amqp_handle_input(amqp_connection_state_t state,
amqp_bytes_t received_data,
amqp_frame_t *decoded_frame)
{
size_t bytes_consumed;
void *raw_frame;
/* Returning frame_type of zero indicates either insufficient input,
or a complete, ignored frame was read. */
decoded_frame->frame_type = 0;
if (received_data.len == 0) {
return AMQP_STATUS_OK;
}
if (state->state == CONNECTION_STATE_IDLE) {
state->state = CONNECTION_STATE_HEADER;
}
bytes_consumed = consume_data(state, &received_data);
/* do we have target_size data yet? if not, return with the
expectation that more will arrive */
if (state->inbound_offset < state->target_size) {
return bytes_consumed;
}
raw_frame = state->inbound_buffer.bytes;
switch (state->state) {
case CONNECTION_STATE_INITIAL:
/* check for a protocol header from the server */
if (memcmp(raw_frame, "AMQP", 4) == 0) {
decoded_frame->frame_type = AMQP_PSEUDOFRAME_PROTOCOL_HEADER;
decoded_frame->channel = 0;
decoded_frame->payload.protocol_header.transport_high
= amqp_d8(raw_frame, 4);
decoded_frame->payload.protocol_header.transport_low
= amqp_d8(raw_frame, 5);
decoded_frame->payload.protocol_header.protocol_version_major
= amqp_d8(raw_frame, 6);
decoded_frame->payload.protocol_header.protocol_version_minor
= amqp_d8(raw_frame, 7);
return_to_idle(state);
return bytes_consumed;
}
/* it's not a protocol header; fall through to process it as a
regular frame header */
case CONNECTION_STATE_HEADER: {
amqp_channel_t channel;
amqp_pool_t *channel_pool;
/* frame length is 3 bytes in */
channel = amqp_d16(raw_frame, 1);
state->target_size
= amqp_d32(raw_frame, 3) + HEADER_SIZE + FOOTER_SIZE;
if ((size_t)state->frame_max < state->target_size) {
return AMQP_STATUS_BAD_AMQP_DATA;
}
channel_pool = amqp_get_or_create_channel_pool(state, channel);
if (NULL == channel_pool) {
return AMQP_STATUS_NO_MEMORY;
}
amqp_pool_alloc_bytes(channel_pool, state->target_size, &state->inbound_buffer);
if (NULL == state->inbound_buffer.bytes) {
return AMQP_STATUS_NO_MEMORY;
}
memcpy(state->inbound_buffer.bytes, state->header_buffer, HEADER_SIZE);
raw_frame = state->inbound_buffer.bytes;
state->state = CONNECTION_STATE_BODY;
bytes_consumed += consume_data(state, &received_data);
/* do we have target_size data yet? if not, return with the
expectation that more will arrive */
if (state->inbound_offset < state->target_size) {
return bytes_consumed;
}
}
/* fall through to process body */
case CONNECTION_STATE_BODY: {
amqp_bytes_t encoded;
int res;
amqp_pool_t *channel_pool;
/* Check frame end marker (footer) */
if (amqp_d8(raw_frame, state->target_size - 1) != AMQP_FRAME_END) {
return AMQP_STATUS_BAD_AMQP_DATA;
}
decoded_frame->frame_type = amqp_d8(raw_frame, 0);
decoded_frame->channel = amqp_d16(raw_frame, 1);
channel_pool = amqp_get_or_create_channel_pool(state, decoded_frame->channel);
if (NULL == channel_pool) {
return AMQP_STATUS_NO_MEMORY;
}
switch (decoded_frame->frame_type) {
case AMQP_FRAME_METHOD:
decoded_frame->payload.method.id = amqp_d32(raw_frame, HEADER_SIZE);
encoded.bytes = amqp_offset(raw_frame, HEADER_SIZE + 4);
encoded.len = state->target_size - HEADER_SIZE - 4 - FOOTER_SIZE;
res = amqp_decode_method(decoded_frame->payload.method.id,
channel_pool, encoded,
&decoded_frame->payload.method.decoded);
if (res < 0) {
return res;
}
break;
case AMQP_FRAME_HEADER:
decoded_frame->payload.properties.class_id
= amqp_d16(raw_frame, HEADER_SIZE);
/* unused 2-byte weight field goes here */
decoded_frame->payload.properties.body_size
= amqp_d64(raw_frame, HEADER_SIZE + 4);
encoded.bytes = amqp_offset(raw_frame, HEADER_SIZE + 12);
encoded.len = state->target_size - HEADER_SIZE - 12 - FOOTER_SIZE;
decoded_frame->payload.properties.raw = encoded;
res = amqp_decode_properties(decoded_frame->payload.properties.class_id,
channel_pool, encoded,
&decoded_frame->payload.properties.decoded);
if (res < 0) {
return res;
}
break;
case AMQP_FRAME_BODY:
decoded_frame->payload.body_fragment.len
= state->target_size - HEADER_SIZE - FOOTER_SIZE;
decoded_frame->payload.body_fragment.bytes
= amqp_offset(raw_frame, HEADER_SIZE);
break;
case AMQP_FRAME_HEARTBEAT:
break;
default:
/* Ignore the frame */
decoded_frame->frame_type = 0;
break;
}
return_to_idle(state);
return bytes_consumed;
}
default:
amqp_abort("Internal error: invalid amqp_connection_state_t->state %d", state->state);
return bytes_consumed;
}
}
int amqp_handle_input(amqp_connection_state_t state,
amqp_bytes_t received_data,
amqp_frame_t *decoded_frame)
{
size_t bytes_consumed;
void *raw_frame;
/* Returning frame_type of zero indicates either insufficient input,
or a complete, ignored frame was read. */
decoded_frame->frame_type = 0;
if (received_data.len == 0)
return 0;
if (state->state == CONNECTION_STATE_IDLE) {
state->inbound_buffer.bytes = amqp_pool_alloc(&state->frame_pool,
state->inbound_buffer.len);
if (state->inbound_buffer.bytes == NULL)
/* state->inbound_buffer.len is always nonzero, because it
corresponds to frame_max, which is not permitted to be less
than AMQP_FRAME_MIN_SIZE (currently 4096 bytes). */
return -ERROR_NO_MEMORY;
state->state = CONNECTION_STATE_HEADER;
}
bytes_consumed = consume_data(state, &received_data);
/* do we have target_size data yet? if not, return with the
expectation that more will arrive */
if (state->inbound_offset < state->target_size)
return bytes_consumed;
raw_frame = state->inbound_buffer.bytes;
switch (state->state) {
case CONNECTION_STATE_INITIAL:
/* check for a protocol header from the server */
if (memcmp(raw_frame, "AMQP", 4) == 0) {
decoded_frame->frame_type = AMQP_PSEUDOFRAME_PROTOCOL_HEADER;
decoded_frame->channel = 0;
decoded_frame->payload.protocol_header.transport_high
= amqp_d8(raw_frame, 4);
decoded_frame->payload.protocol_header.transport_low
= amqp_d8(raw_frame, 5);
decoded_frame->payload.protocol_header.protocol_version_major
= amqp_d8(raw_frame, 6);
decoded_frame->payload.protocol_header.protocol_version_minor
= amqp_d8(raw_frame, 7);
return_to_idle(state);
return bytes_consumed;
}
/* it's not a protocol header; fall through to process it as a
regular frame header */
case CONNECTION_STATE_HEADER:
/* frame length is 3 bytes in */
state->target_size
= amqp_d32(raw_frame, 3) + HEADER_SIZE + FOOTER_SIZE;
state->state = CONNECTION_STATE_BODY;
bytes_consumed += consume_data(state, &received_data);
/* do we have target_size data yet? if not, return with the
expectation that more will arrive */
if (state->inbound_offset < state->target_size)
return bytes_consumed;
/* fall through to process body */
case CONNECTION_STATE_BODY: {
amqp_bytes_t encoded;
int res;
/* Check frame end marker (footer) */
if (amqp_d8(raw_frame, state->target_size - 1) != AMQP_FRAME_END)
return -ERROR_BAD_AMQP_DATA;
decoded_frame->frame_type = amqp_d8(raw_frame, 0);
decoded_frame->channel = amqp_d16(raw_frame, 1);
switch (decoded_frame->frame_type) {
case AMQP_FRAME_METHOD:
decoded_frame->payload.method.id = amqp_d32(raw_frame, HEADER_SIZE);
encoded.bytes = amqp_offset(raw_frame, HEADER_SIZE + 4);
encoded.len = state->target_size - HEADER_SIZE - 4 - FOOTER_SIZE;
res = amqp_decode_method(decoded_frame->payload.method.id,
&state->decoding_pool, encoded,
&decoded_frame->payload.method.decoded);
if (res < 0)
return res;
break;
case AMQP_FRAME_HEADER:
decoded_frame->payload.properties.class_id
= amqp_d16(raw_frame, HEADER_SIZE);
/* unused 2-byte weight field goes here */
decoded_frame->payload.properties.body_size
= amqp_d64(raw_frame, HEADER_SIZE + 4);
encoded.bytes = amqp_offset(raw_frame, HEADER_SIZE + 12);
encoded.len = state->target_size - HEADER_SIZE - 12 - FOOTER_SIZE;
decoded_frame->payload.properties.raw = encoded;
res = amqp_decode_properties(decoded_frame->payload.properties.class_id,
&state->decoding_pool, encoded,
&decoded_frame->payload.properties.decoded);
if (res < 0)
return res;
break;
case AMQP_FRAME_BODY:
decoded_frame->payload.body_fragment.len
= state->target_size - HEADER_SIZE - FOOTER_SIZE;
decoded_frame->payload.body_fragment.bytes
= amqp_offset(raw_frame, HEADER_SIZE);
break;
case AMQP_FRAME_HEARTBEAT:
break;
default:
/* Ignore the frame */
decoded_frame->frame_type = 0;
break;
}
return_to_idle(state);
if (decoded_frame->frame_type == AMQP_FRAME_METHOD) {
if (decoded_frame->payload.method.id == AMQP_BASIC_RETURN_METHOD) {
amqp_basic_return_t *m = decoded_frame->payload.method.decoded;
if(state->basic_return_callback)
state->basic_return_callback(decoded_frame->channel, m,
state->basic_return_callback_data);
}
else if (decoded_frame->payload.method.id == AMQP_CHANNEL_CLOSE_METHOD) {
amqp_channel_close_t *m = decoded_frame->payload.method.decoded;
if (state->channel_close_callback)
state->channel_close_callback(decoded_frame->channel, m,
state->channel_close_callback_data);
}
}
return bytes_consumed;
}
default:
amqp_abort("Internal error: invalid amqp_connection_state_t->state %d", state->state);
return bytes_consumed;
}
}