FlapJackApps/libdivecomputer
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Exclude the 4 byte length from the sample data.

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Correctly skip the 4 byte length in front of the sample data. The
previous code happened to work by accident, because the header after the
sample data was assumed to be 4 bytes larger, and thus those two errors
cancelled each other out.
This commit is contained in:
Jef Driesen 2011-09-24 10:31:31 +02:00
parent 786e4a7ae4
commit 1ce8dec1d8
2 changed files with 20 additions and 16 deletions
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10
src/mares_iconhd.c
View File

@ -36,6 +36,8 @@
#define ACK 0xAA
#define EOF 0xEA
#define HEADER 0x5C
#define RB_PROFILE_BEGIN 0xA000
#define RB_PROFILE_END MARES_ICONHD_MEMORY_SIZE
@ -382,9 +384,9 @@ mares_iconhd_extract_dives (device_t *abstract, const unsigned char data[], unsi
memcpy (buffer + RB_PROFILE_END - eop, data + RB_PROFILE_BEGIN, eop - RB_PROFILE_BEGIN);
unsigned int offset = RB_PROFILE_END - RB_PROFILE_BEGIN;
while (offset >= 0x60) {
while (offset >= HEADER + 4) {
// Get the number of samples in the profile data.
unsigned int nsamples = array_uint16_le (buffer + offset - 0x5A);
unsigned int nsamples = array_uint16_le (buffer + offset - HEADER + 2);
if (nsamples == 0xFFFF)
break;
@ -392,7 +394,7 @@ mares_iconhd_extract_dives (device_t *abstract, const unsigned char data[], unsi
// If the buffer does not contain that much bytes, we reached the
// end of the ringbuffer. The current dive is incomplete (partially
// overwritten with newer data), and processing should stop.
unsigned int nbytes = nsamples * 8 + 0x60;
unsigned int nbytes = 4 + nsamples * 8 + HEADER;
if (offset < nbytes)
break;
@ -411,7 +413,7 @@ mares_iconhd_extract_dives (device_t *abstract, const unsigned char data[], unsi
return DEVICE_STATUS_ERROR;
}
unsigned char *fp = buffer + offset + length - 0x56;
unsigned char *fp = buffer + offset + length - HEADER + 6;
if (device && memcmp (fp, device->fingerprint, sizeof (device->fingerprint)) == 0) {
free (buffer);
return DEVICE_STATUS_SUCCESS;

26
src/mares_iconhd_parser.c
View File

@ -26,6 +26,8 @@
#include "utils.h"
#include "array.h"
#define HEADER 0x5C
typedef struct mares_iconhd_parser_t mares_iconhd_parser_t;
struct mares_iconhd_parser_t {
@ -108,10 +110,10 @@ mares_iconhd_parser_get_datetime (parser_t *abstract, dc_datetime_t *datetime)
unsigned int length = array_uint32_le (abstract->data);
if (abstract->size < length || length < 0x60)
if (abstract->size < length || length < HEADER + 4)
return PARSER_STATUS_ERROR;
const unsigned char *p = abstract->data + length - 0x56;
const unsigned char *p = abstract->data + length - HEADER + 6;
if (datetime) {
datetime->hour = array_uint16_le (p + 0);
@ -134,27 +136,27 @@ mares_iconhd_parser_get_field (parser_t *abstract, parser_field_type_t type, uns
unsigned int length = array_uint32_le (abstract->data);
if (abstract->size < length || length < 0x60)
if (abstract->size < length || length < HEADER + 4)
return PARSER_STATUS_ERROR;
const unsigned char *p = abstract->data + length - 0x60;
const unsigned char *p = abstract->data + length - HEADER;
gasmix_t *gasmix = (gasmix_t *) value;
if (value) {
switch (type) {
case FIELD_TYPE_DIVETIME:
*((unsigned int *) value) = array_uint16_le (p + 0x06) * 5;
*((unsigned int *) value) = array_uint16_le (p + 0x02) * 5;
break;
case FIELD_TYPE_MAXDEPTH:
*((double *) value) = array_uint16_le (p + 0x08) / 10.0;
*((double *) value) = array_uint16_le (p + 0x04) / 10.0;
break;
case FIELD_TYPE_GASMIX_COUNT:
*((unsigned int *) value) = 3;
break;
case FIELD_TYPE_GASMIX:
gasmix->helium = 0.0;
gasmix->oxygen = p[0x18 + flags * 4] / 100.0;
gasmix->oxygen = p[0x14 + flags * 4] / 100.0;
gasmix->nitrogen = 1.0 - gasmix->oxygen - gasmix->helium;
break;
default:
@ -174,16 +176,16 @@ mares_iconhd_parser_samples_foreach (parser_t *abstract, sample_callback_t callb
unsigned int length = array_uint32_le (abstract->data);
if (abstract->size < length || length < 0x60)
if (abstract->size < length || length < HEADER + 4)
return PARSER_STATUS_ERROR;
const unsigned char *data = abstract->data;
unsigned int size = length - 0x60;
unsigned int size = length - HEADER;
unsigned int time = 0;
unsigned int interval = 5;
unsigned int offset = 0;
unsigned int offset = 4;
while (offset + 8 <= size) {
parser_sample_value_t sample = {0};
@ -193,12 +195,12 @@ mares_iconhd_parser_samples_foreach (parser_t *abstract, sample_callback_t callb
if (callback) callback (SAMPLE_TYPE_TIME, sample, userdata);
// Depth (1/10 m).
unsigned int depth = array_uint16_le (data + offset + 4);
unsigned int depth = array_uint16_le (data + offset + 0);
sample.depth = depth / 10.0;
if (callback) callback (SAMPLE_TYPE_DEPTH, sample, userdata);
// Temperature (1/10 °C).
unsigned int temperature = array_uint16_le (data + offset + 6);
unsigned int temperature = array_uint16_le (data + offset + 2);
sample.temperature = temperature / 10.0;
if (callback) callback (SAMPLE_TYPE_TEMPERATURE, sample, userdata);