mirror of
https://github.com/vgmstream/vgmstream.git
synced 2024-12-23 20:04:50 +01:00
37 lines
870 B
C
37 lines
870 B
C
#ifndef _JSTM_STREAMFILE_H_
|
|
#define _JSTM_STREAMFILE_H_
|
|
#include "../streamfile.h"
|
|
|
|
|
|
typedef struct {
|
|
off_t start;
|
|
} jstm_io_data;
|
|
|
|
static size_t jstm_io_read(STREAMFILE *sf, uint8_t *dest, off_t offset, size_t length, jstm_io_data* data) {
|
|
int i;
|
|
size_t bytes = read_streamfile(dest, offset, length, sf);
|
|
|
|
/* decrypt data (xor) */
|
|
for (i = 0; i < bytes; i++) {
|
|
if (offset + i >= data->start) {
|
|
dest[i] ^= 0x5A;
|
|
}
|
|
}
|
|
|
|
return bytes;
|
|
}
|
|
|
|
/* decrypts JSTM stream */
|
|
static STREAMFILE* setup_jstm_streamfile(STREAMFILE *sf, off_t start) {
|
|
STREAMFILE *new_sf = NULL;
|
|
jstm_io_data io_data = {0};
|
|
|
|
io_data.start = start;
|
|
|
|
new_sf = open_wrap_streamfile(sf);
|
|
new_sf = open_io_streamfile_f(new_sf, &io_data, sizeof(jstm_io_data), jstm_io_read, NULL);
|
|
return new_sf;
|
|
}
|
|
|
|
#endif /* _JSTM_STREAMFILE_H_ */
|