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Loop-unroll in CoAP for fixing some potential bugs on some platforms

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where size_t is not the same as unsigned int.
This commit is contained in:
Joakim Eriksson 2015-04-30 12:16:04 +02:00 committed by Niclas Finne
parent 70b3585f76
commit 1e0b5292d7
1 changed files with 33 additions and 25 deletions
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58
apps/er-coap/er-coap.c
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@ -113,17 +113,19 @@ coap_set_option_header(unsigned int delta, size_t length, uint8_t *buffer)
buffer[0] = coap_option_nibble(delta) << 4 | coap_option_nibble(length);
/* avoids code duplication without function overhead */
unsigned int *x = &delta;
if(delta > 268) {
buffer[++written] = ((delta - 269) >> 8) & 0xff;
buffer[++written] = (delta - 269) & 0xff;
} else if(delta > 12) {
buffer[++written] = (delta - 13);
}
do {
if(*x > 268) {
buffer[++written] = (*x - 269) >> 8;
buffer[++written] = (*x - 269);
} else if(*x > 12) {
buffer[++written] = (*x - 13);
}
} while(x != &length && (x = &length));
if(length > 268) {
buffer[++written] = ((length - 269) >> 8) & 0xff;
buffer[++written] = (length - 269) & 0xff;
} else if(length > 12) {
buffer[++written] = (length - 13);
}
PRINTF("WRITTEN %u B opt header\n", 1 + written);
@ -500,25 +502,31 @@ coap_parse_message(void *packet, uint8_t *data, uint16_t data_len)
option_length = current_option[0] & 0x0F;
++current_option;
/* avoids code duplication without function overhead */
unsigned int *x = &option_delta;
if(option_delta == 13) {
option_delta += current_option[0];
++current_option;
} else if(option_delta == 14) {
option_delta += 255;
option_delta += current_option[0] << 8;
++current_option;
option_delta += current_option[0];
++current_option;
}
do {
if(*x == 13) {
*x += current_option[0];
++current_option;
} else if(*x == 14) {
*x += 255;
*x += current_option[0] << 8;
++current_option;
*x += current_option[0];
++current_option;
}
} while(x != &option_length && (x = &option_length));
if(option_length == 13) {
option_length += current_option[0];
++current_option;
} else if(option_length == 14) {
option_length += 255;
option_length += current_option[0] << 8;
++current_option;
option_length += current_option[0];
++current_option;
}
option_number += option_delta;
PRINTF("OPTION %u (delta %u, len %u): ", option_number, option_delta,
PRINTF("OPTION %u (delta %u, len %zu): ", option_number, option_delta,
option_length);
SET_OPTION(coap_pkt, option_number);