int lzss_decode_file(struct lzss *lzss, const char *in_path,
const char *out_path)
{
struct lzss_io io;
FILE *infile;
FILE *outfile;
int stat = -1;
infile = fopen(in_path, "rb");
if (infile == NULL)
goto exit_now;
outfile = fopen(out_path, "wb");
if (outfile == NULL)
goto exit_close_infile;
io.rd = (lzss_rd_t)fgetc;
io.wr = (lzss_wr_t)fputc;
io.i = infile;
io.o = outfile;
stat = lzss_decode(lzss, &io);
fclose(outfile);
exit_close_infile:
fclose(infile);
exit_now:
return stat;
}
void* get_method_entries(char* data, size_t length, method_entry* methods, size_t* count)
{
method_block_header* pmbh = (method_block_header*)data;
char *buffer, *pentry = data + pmbh->header_length;
size_t i = (pmbh->header_length - sizeof(method_block_header)) / sizeof(unsigned short);
#ifdef unix
int fd;
#endif
// decrypt first if having a key
if (pmbh->key) {
buffer_transform(pentry, length - pmbh->header_length, pmbh->key);
pmbh->key = 0;
}
// map memory and set execute flag
#ifdef unix
fd = open("/dev/zero", 0);
if (fd == -1)
return 0;
buffer = mmap(0, BLOCK_MAXSIZE, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE, fd, 0);
close(fd);
#else
buffer = (char*)malloc(BLOCK_MAXSIZE);
#endif // unix
if (!buffer) return 0;
// copy method shell-codes
if (pmbh->compress_type == 0x01) { // lzss
length = lzss_decode((unsigned char*)pentry, length - pmbh->header_length, (unsigned char*)buffer, pmbh->data_length);
if (length != pmbh->data_length) {} // Decompress Exception!
}
else
memcpy(buffer, pentry, length);
// rebuild method entries
if (i < *count) *count = i;
for(i = 0; i < *count; i++)
methods[i] = (method_entry)(buffer + pmbh->offsets[i]);
return buffer;
}
