}
struct data_in_s {
- unsigned char *start; /* 0 */
- unsigned char *stop; /* 4 */
- unsigned char bitpos; /* 8 */
- unsigned char byte; /* 9 */
+ unsigned char *start;
+ unsigned char *stop;
+ unsigned char bitpos;
+ unsigned char byte;
};
struct data_out_s {
return byte;
}
-unsigned char fn_59848(struct data_in_s *data_in)
+unsigned char get_next_bit(struct data_in_s *data_in)
{
- unsigned char r5;
+ unsigned char bitval;
if (data_in->bitpos == 0x80) {
data_in->byte = get_next_in_byte(data_in);
}
- r5 = data_in->bitpos & data_in->byte;
+ bitval = data_in->bitpos & data_in->byte;
data_in->bitpos >>= 1;
if (data_in->bitpos == 0) {
data_in->bitpos = 0x80;
}
- if (r5 == 0)
+ if (bitval == 0)
return 0;
return 1;
}
-unsigned int fn_598b4(struct data_in_s *r11_data, unsigned int r10_arg2)
+unsigned int get_next_bits(struct data_in_s *data_in, unsigned int bits)
{
- unsigned int r6;
- unsigned int r7;
+ unsigned int bit;
+ unsigned int next_bits;
- r6 = 1 << (r10_arg2 - 1);
+ bit = 1 << (bits - 1);
- r7 = 0;
- while (r6 != 0) {
- if (r11_data->bitpos == 0x80) {
- r11_data->byte = get_next_in_byte(r11_data);
+ next_bits = 0;
+ while (bit != 0) {
+ if (data_in->bitpos == 0x80) {
+ data_in->byte = get_next_in_byte(data_in);
}
- if ((r11_data->bitpos & r11_data->byte) != 0)
- r7 = r7 | r6;
- r6 = r6 >> 1;
+ if ((data_in->bitpos & data_in->byte) != 0)
+ next_bits = next_bits | bit;
+
+ bit = bit >> 1;
- r11_data->bitpos >>= 1;
+ data_in->bitpos >>= 1;
- if(r11_data->bitpos == 0) {
- r11_data->bitpos = 0x80;
+ if(data_in->bitpos == 0) {
+ data_in->bitpos = 0x80;
}
}
- return r7;
+ return next_bits;
}
void write_byte(unsigned char byte, struct data_out_s *data_out)
data_out->pos++;
}
-void lz_expand(struct data_in_s *r10_data, struct data_out_s *data_out)
+void lz_expand(struct data_in_s *data_in, struct data_out_s *data_out)
{
- unsigned int r5;
- unsigned int r2;
- unsigned char r4;
- unsigned int r6;
- unsigned int r7;
- unsigned int r11;
- unsigned char arr_59b64[1024];
+ unsigned int pos;
+ unsigned int wordoffset;
+ unsigned int i;
+ unsigned char byte;
+ unsigned int wordlen;
+ unsigned char buf[1024];
- r5 = 1;
+ pos = 1;
while (1) {
while (1) {
- r2 = fn_59848(r10_data);
- if (r2 == 0)
+ /* Compressed/uncompressed? */
+ if (get_next_bit(data_in) == 0)
break;
- r2 = fn_598b4(r10_data, 8) & 0xff;
+ /* Uncompressed byte */
+ byte = get_next_bits(data_in, 8);
- write_byte(r2, data_out);
- arr_59b64[r5] = r2 & 0xff;
- r5 = (r5 + 1) & 0x3ff;
+ write_byte(byte, data_out);
+
+ /* Save byte in buffer, to be reused later */
+ buf[pos] = byte;
+ pos = (pos + 1) & 0x3ff;
}
- r11 = fn_598b4(r10_data, 0x0a);
- if(r11 == 0)
+ /* offset for start of dictionary word */
+ wordoffset = get_next_bits(data_in, 0x0a);
+ if(wordoffset == 0)
return;
- r2 = fn_598b4(r10_data, 0x04);
- r7 = r2 + 1;
- r6 = 0;
- while (r6 <= r7) {
- r2 = (r6 + r11) & 0x3ff;
- r4 = arr_59b64[r2];
- write_byte(r4, data_out);
- arr_59b64[r5] = r4;
- r5 = (r5 + 1) & 0x3ff;
- r6++;
+ /* length of dictionary word used */
+ wordlen = get_next_bits(data_in, 0x04) + 1;
+ for (i = 0; i <= wordlen ; i++) {
+ /* lookup dictionary byte */
+ byte = buf[(wordoffset + i) & 0x3ff];
+ write_byte(byte, data_out);
+ /* Save byte in buffer, to be reused later */
+ buf[pos] = byte;
+ pos = (pos + 1) & 0x3ff;
}
}
}
/* Checksum is only used for the compressed firmware in 'firmware' */
-#if 0
-unsigned int crc_check_59684(unsigned char *arg1, unsigned int arg2, unsigned int magic)
+unsigned int crc_check(unsigned char *buf, unsigned int len, unsigned int magic)
{
- unsigned int r3;
- unsigned int r4;
- unsigned int r5;
-
-#if 0
- if (r0 < 0xc0000000)
- return 1;
-#endif
+ unsigned int file_crc;
+ unsigned int my_len;
+ unsigned int crc;
+ unsigned int my_magic;
- /* ??? */
- r4 = *((unsigned int*)arg1 + 0x20);
- r5 = *((unsigned int*)arg1 + 0x24);
+ my_len = *((unsigned int*)(buf + 0x20));
+ my_magic = *((unsigned int*)(buf + 0x24));
- printf("magic: 0x%08x <-> 0x%08x\n", r5, magic);
- if (r5 != magic)
+ if (my_magic != magic) {
+ printf("\nmagic: 0x%08x <-> 0x%08x\n", my_magic, magic);
return 2;
+ }
- if (arg2 >= r4)
- r5 = 0;
- else
+ if (len < my_len)
return 3;
- r5 = ~rsb_crc(~0x00, arg1, r4);
- r3 = *((unsigned int*)(arg1 + r4));
- printf("Checksums: 0x%02x <-> 0x%02x\n", r5, r3);
+ crc = ~rsb_crc(~0x00, buf, len);
+ file_crc = *((unsigned int*)(buf + len));
- if (r3 == r5)
- return 0;
+ if (file_crc != crc) {
+ printf("\nChecksums: 0x%08x <-> 0x%08x!\n", crc, file_crc);
+ return 4;
+ }
- return 4;
+ return 0;
}
-#endif
-void extract_lz_file(unsigned char *inbuf, unsigned char *name)
+void extract_lz_file(unsigned char *inbuf, unsigned char *name, unsigned char check_crc)
{
unsigned int len;
unsigned char *outbuf;
lz_expand(&data_in, &data_out);
-#if 0
- /* Checksum is only used for the compressed firmware in 'firmware' */
- r3 = r7 + 0x20;
- r5 = *((unsigned int*)r3);
+ if (check_crc) {
+ unsigned int crclen;
+ int ret;
- if ((ret = crc_check_59684(r7, r5, 0x46335053)) != 0) {
- printf("crc_check return: %d\n", ret);
- err_exit(__func__);
+ crclen = *((unsigned int*)(outbuf + 0x20));
+
+ if ((ret = crc_check(outbuf, crclen, 0x46335053)) != 0) {
+ printf("crc_check return: %d\n", ret);
+ err_exit(__func__);
+ }
}
-#endif
write_file((char*)name, outbuf, len);
projects / rsbs2 / blobdiff