static void readinfo_bitstream(char *bitdata, char *buf, int *offset)
{
char tbuf[64];
int32_t len;
/* read section char */
read_bitstream(bitdata, tbuf, offset, 1);
/* read length */
read_bitstream(bitdata, tbuf, offset, 2);
len = tbuf[0] << 8 | tbuf[1];
read_bitstream(bitdata, buf, offset, len);
buf[len] = '\0';
}
/*
* read bitdata length
*/
static int readlength_bitstream(char *bitdata, int *lendata, int *offset)
{
char tbuf[64];
/* read section char */
read_bitstream(bitdata, tbuf, offset, 1);
/* make sure it is section 'e' */
if (tbuf[0] != 'e') {
pr_err("error: length section is not 'e', but %c\n", tbuf[0]);
return -1;
}
/* read 4bytes length */
read_bitstream(bitdata, tbuf, offset, 4);
*lendata = tbuf[0] << 24 | tbuf[1] << 16 |
tbuf[2] << 8 | tbuf[3];
return 0;
}
/*
* read first 13 bytes to check bitstream magic number
*/
static int readmagic_bitstream(char *bitdata, int *offset)
{
char buf[13];
int r;
read_bitstream(bitdata, buf, offset, 13);
r = memcmp(buf, bits_magic, 13);
if (r) {
pr_err("error: corrupted header");
return -1;
}
pr_info("bitstream file magic number Ok\n");
*offset = 13; /* magic length */
return 0;
}
/*
* Reads a byte from stream
*/
bool read_byte(struct bitstream *stream, uint8_t *value)
{
bool error = true;
if (stream != NULL && value != NULL) {
uint8_t count;
uint32_t dest;
count = read_bitstream(stream, 8, &dest, false);
if (count == 8) {
error = false;
*value = (uint8_t)dest;
}
}
return error;
}
