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37 lines
870 B
C
37 lines
870 B
C
#ifndef _JSTM_STREAMFILE_H_
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#define _JSTM_STREAMFILE_H_
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#include "../streamfile.h"
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typedef struct {
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off_t start;
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} jstm_io_data;
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static size_t jstm_io_read(STREAMFILE *sf, uint8_t *dest, off_t offset, size_t length, jstm_io_data* data) {
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int i;
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size_t bytes = read_streamfile(dest, offset, length, sf);
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/* decrypt data (xor) */
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for (i = 0; i < bytes; i++) {
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if (offset + i >= data->start) {
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dest[i] ^= 0x5A;
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}
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}
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return bytes;
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}
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/* decrypts JSTM stream */
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static STREAMFILE* setup_jstm_streamfile(STREAMFILE *sf, off_t start) {
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STREAMFILE *new_sf = NULL;
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jstm_io_data io_data = {0};
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io_data.start = start;
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new_sf = open_wrap_streamfile(sf);
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new_sf = open_io_streamfile_f(new_sf, &io_data, sizeof(jstm_io_data), jstm_io_read, NULL);
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return new_sf;
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}
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#endif /* _JSTM_STREAMFILE_H_ */
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