--- /dev/null
+#include <stdio.h>
+#include <stdlib.h>
+#include <strings.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include "rsb-crc.h"
+#include "rsb-lz.h"
+#include "filesystem.h"
+
+void err_exit(const char *fname)
+{
+ fprintf(stderr,"%s: error extracting...\n", fname);
+ exit(1);
+}
+
+struct data_in_s {
+ unsigned char *start;
+ unsigned char *stop;
+ unsigned char bitpos;
+ unsigned char byte;
+};
+
+struct data_out_s {
+ unsigned char *pos;
+ unsigned char *end;
+};
+
+unsigned char get_next_in_byte(struct data_in_s *data_in)
+{
+ unsigned char byte;
+
+ if (data_in->stop < data_in->start)
+ err_exit(__func__);
+
+ byte = *(data_in->start);
+ data_in->start++;
+
+ return byte;
+}
+
+unsigned char get_next_bit(struct data_in_s *data_in)
+{
+ unsigned char bitval;
+
+ if (data_in->bitpos == 0x80) {
+ data_in->byte = get_next_in_byte(data_in);
+ }
+
+ bitval = data_in->bitpos & data_in->byte;
+
+ data_in->bitpos >>= 1;
+ if (data_in->bitpos == 0) {
+ data_in->bitpos = 0x80;
+ }
+
+ if (bitval == 0)
+ return 0;
+
+ return 1;
+}
+
+unsigned int get_next_bits(struct data_in_s *data_in, unsigned int bits)
+{
+ unsigned int bit;
+ unsigned int next_bits;
+
+ bit = 1 << (bits - 1);
+
+ next_bits = 0;
+ while (bit != 0) {
+ if (data_in->bitpos == 0x80) {
+ data_in->byte = get_next_in_byte(data_in);
+ }
+
+ if ((data_in->bitpos & data_in->byte) != 0)
+ next_bits = next_bits | bit;
+
+ bit = bit >> 1;
+
+ data_in->bitpos >>= 1;
+
+ if(data_in->bitpos == 0) {
+ data_in->bitpos = 0x80;
+ }
+ }
+
+ return next_bits;
+}
+
+void write_byte(unsigned char byte, struct data_out_s *data_out)
+{
+ if (data_out->pos > data_out->end) {
+ err_exit(__func__);
+ }
+
+ *(data_out->pos) = byte;
+ data_out->pos++;
+}
+
+void lz_expand(struct data_in_s *data_in, struct data_out_s *data_out)
+{
+ unsigned int pos;
+ unsigned int wordoffset;
+ unsigned int i;
+ unsigned char byte;
+ unsigned int wordlen;
+ unsigned char buf[1024];
+
+ pos = 1;
+
+ while (1) {
+ while (1) {
+ /* Compressed/uncompressed? */
+ if (get_next_bit(data_in) == 0)
+ break;
+
+ /* Uncompressed byte */
+ byte = get_next_bits(data_in, 8);
+
+ write_byte(byte, data_out);
+
+ /* Save byte in buffer, to be reused later */
+ buf[pos] = byte;
+ pos = (pos + 1) & 0x3ff;
+ }
+
+ /* offset for start of dictionary word */
+ wordoffset = get_next_bits(data_in, 0x0a);
+ if(wordoffset == 0)
+ return;
+
+ /* 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;
+ }
+ }
+}
+
+void set_next_bit(unsigned char *buf, unsigned int set, unsigned int *currbit) {
+ unsigned char *pos;
+ unsigned char bitpos;
+
+ if (set) {
+ pos = buf + ((*currbit) / 8);
+ bitpos = 0x80 >> ((*currbit) % 8);
+ *pos |= bitpos;
+ }
+
+ *currbit = *currbit + 1;
+}
+
+void write_bits(unsigned char *buf, unsigned int data, unsigned int bits, unsigned int *currbit) {
+ int i;
+ unsigned int bitpos;
+
+ bitpos = 1 << (bits - 1);
+
+ for (i = 0; i < bits; i++) {
+ set_next_bit(buf, data & bitpos, currbit);
+ bitpos >>= 1;
+ }
+}
+
+unsigned char *compress_lz(unsigned char *inbuf, int inlen, int *outlen)
+{
+ unsigned char *end = inbuf + inlen;
+ unsigned char *outbuf;
+ unsigned char window[1024];
+ int pos = 0;
+ int fill = 0;
+ unsigned int currbit = 0;
+ int offset;
+ int wordlen;
+ int found;
+ int i;
+
+ if ((outbuf = malloc((inlen * 2) + 4)) == NULL) {
+ perror("malloc");
+ }
+
+ *((unsigned int*)outbuf) = LZ_MAGIC;
+ currbit = 8 * 8;
+
+ while(inbuf < end) {
+ found = 0;
+ for (wordlen = 17; wordlen > 1; wordlen--) {
+ for (offset = 1; offset < ((fill < 1023) ? fill : 1023); offset++) {
+ if ((fill < 1023) &&
+ (wordlen + offset > fill))
+ break;
+
+ for (i = 0; i < wordlen; i++) {
+ if (inbuf[i] != window[(offset + i) & 0x3ff]) {
+ break;
+ }
+ }
+ if (i == wordlen)
+ found = 1;
+ }
+ if (found)
+ break;
+ }
+
+ if (found) {
+ write_bits(outbuf, 0x00, 0x01, &currbit);
+ write_bits(outbuf, offset, 0x0a, &currbit);
+ write_bits(outbuf, wordlen - 1, 0x04, &currbit);
+ for (i = 0; i < wordlen; i++) {
+ window[pos] = *(inbuf + i);
+ pos = (pos + 1) & 0x3ff;
+ }
+ inbuf += wordlen;
+
+ if (fill < sizeof(window))
+ fill += wordlen;
+ } else {
+ write_bits(outbuf, 0x01, 0x01, &currbit);
+ write_bits(outbuf, *inbuf, 0x08, &currbit);
+ window[pos] = *inbuf;
+ pos = (pos + 1) & 0x3ff;
+ inbuf++;
+ if (fill < sizeof(window))
+ fill++;
+ }
+ }
+
+ write_bits(outbuf, 0x00, 0x01, &currbit);
+ write_bits(outbuf, 0x00, 0x0a, &currbit);
+
+ *outlen = (currbit / 8) + 1;
+
+ *((unsigned int*)(outbuf + 4)) = *outlen;
+
+ return outbuf;
+}
+
+/* Checksum is only used for the compressed firmware in 'firmware' */
+unsigned int crc_check(unsigned char *buf, unsigned int len, unsigned int magic)
+{
+ unsigned int file_crc;
+ unsigned int my_len;
+ unsigned int crc;
+ unsigned int my_magic;
+
+ my_len = *((unsigned int*)(buf + 0x20));
+ my_magic = *((unsigned int*)(buf + 0x24));
+
+ if (my_magic != magic) {
+ printf("\nmagic: 0x%08x <-> 0x%08x\n", my_magic, magic);
+ return 2;
+ }
+
+ if (len < my_len)
+ return 3;
+
+ crc = ~rsb_crc(~0x00, buf, len);
+ file_crc = *((unsigned int*)(buf + len));
+
+ if (file_crc != crc) {
+ printf("\nChecksums: 0x%08x <-> 0x%08x!\n", crc, file_crc);
+ return 4;
+ }
+
+ return 0;
+}
+
+unsigned char *extract_lz_file(unsigned char *inbuf, unsigned int *outlen , unsigned char check_crc)
+{
+ unsigned char *outbuf;
+ struct data_in_s data_in;
+ struct data_out_s data_out;
+
+ if (*((unsigned int*)inbuf) != LZ_MAGIC)
+ err_exit(__func__);
+
+ *outlen = *((unsigned int*)(inbuf + 4));
+ printf(", length: %d", *outlen);
+
+ if ((outbuf = malloc(*outlen)) == NULL) {
+ perror("malloc");
+ exit(1);
+ }
+
+ bzero(outbuf, *outlen);
+
+ data_in.start = inbuf + 8;
+ data_in.stop = inbuf + *outlen;
+ data_in.byte = 0x00;
+ data_in.bitpos = 0x80;
+
+ data_out.pos = outbuf;
+ data_out.end = outbuf + *outlen;
+
+ lz_expand(&data_in, &data_out);
+
+ if (check_crc) {
+ unsigned int crclen;
+ int ret;
+
+ crclen = *((unsigned int*)(outbuf + 0x20));
+
+ if ((ret = crc_check(outbuf, crclen, 0x46335053)) != 0) {
+ printf("crc_check return: %d\n", ret);
+ err_exit(__func__);
+ }
+ }
+
+ return outbuf;
+}
projects / rsbs2 / blobdiff