mirror of
https://git.planet-casio.com/Lephenixnoir/fxsdk.git
synced 2024-12-29 13:03:37 +01:00
48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
#include <string.h>
|
|
#include <endian.h>
|
|
#include <fxg1a.h>
|
|
|
|
/*
|
|
** Public API
|
|
*/
|
|
|
|
/* checksum(): Sum of 8 big-endian shorts at 0x300 */
|
|
uint16_t checksum(struct g1a const *g1a, size_t size)
|
|
{
|
|
uint16_t shorts[16] = { 0 };
|
|
|
|
/* Extract 16 bytes from the file (maybe less are available) */
|
|
int available = size - 0x300;
|
|
if(available < 0) available = 0;
|
|
if(available > 16) available = 16;
|
|
memcpy(shorts, g1a->code + 0x100, available);
|
|
|
|
/* Do the big-endian sum */
|
|
uint16_t sum = 0;
|
|
for(int i = 0; i < 8; i++) sum += htobe16(shorts[i]);
|
|
|
|
return sum;
|
|
}
|
|
|
|
/* default_output(): Calculate default output file name */
|
|
void default_output(const char *name, const char *suffix, char *output)
|
|
{
|
|
/* Check if there is a dot at the end of @name, before the last '/'.
|
|
The dot must also not be in first position (hidden files) */
|
|
size_t end = strlen(name) - 1;
|
|
while(end >= 1 && name[end] != '/' && name[end] != '.') end--;
|
|
|
|
/* If we don't have a dot in the file name, append the extension */
|
|
if(end < 1 || name[end] != '.')
|
|
{
|
|
strcpy(output, name);
|
|
strcat(output, suffix);
|
|
}
|
|
|
|
/* If we found a dot before the last slash, replace the extension */
|
|
else
|
|
{
|
|
memcpy(output, name, end);
|
|
strcpy(output + end, suffix);
|
|
}
|
|
}
|