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Parse the firmware version

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The patterns used for the version string have the firmware version
masked out because it varies. We can re-use those masks to extract the
firmware version.
This commit is contained in:
Jef Driesen 2020-03-31 22:34:33 +02:00
parent 5b133233f7
commit 014a15ba62
1 changed files with 24 additions and 4 deletions
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28
src/oceanic_common.c
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@ -99,11 +99,31 @@ get_profile_last (const unsigned char data[], const oceanic_common_layout_t *lay
static int
oceanic_common_match_pattern (const unsigned char *string, const unsigned char *pattern)
oceanic_common_match_pattern (const unsigned char *string, const unsigned char *pattern, unsigned int *firmware)
{
unsigned int value = 0;
unsigned int count = 0;
for (unsigned int i = 0; i < PAGESIZE; ++i, ++pattern, ++string) {
if (*pattern != '\0' && *pattern != *string)
return 0;
if (*pattern != '\0') {
// Compare the pattern.
if (*pattern != *string)
return 0;
} else {
// Extract the firmware version.
// This is based on the assumption that (only) the first block of
// zeros in the pattern contains the firmware version.
if (i == 0 || *(pattern - 1) != '\0')
count++;
if (count == 1) {
value <<= 8;
value |= *string;
}
}
}
if (firmware) {
*firmware = value;
}
return 1;
@ -114,7 +134,7 @@ int
oceanic_common_match (const unsigned char *version, const oceanic_common_version_t patterns[], unsigned int n)
{
for (unsigned int i = 0; i < n; ++i) {
if (oceanic_common_match_pattern (version, patterns[i]))
if (oceanic_common_match_pattern (version, patterns[i], NULL))
return 1;
}