diff options
Diffstat (limited to 'src/decompress.c')
-rw-r--r-- | src/decompress.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/src/decompress.c b/src/decompress.c new file mode 100644 index 0000000..dea2bca --- /dev/null +++ b/src/decompress.c | |||
@@ -0,0 +1,52 @@ | |||
1 | #include <zlib.h> | ||
2 | #include <stdio.h> | ||
3 | #include <unistd.h> | ||
4 | #include <fcntl.h> | ||
5 | |||
6 | #define XORLEN (29) | ||
7 | #define HUGEBLOCK (1024*1024) | ||
8 | |||
9 | int main(int argc, char **argv) { | ||
10 | // int infile = open("/Volumes/DasTelefonbuch/atb/phonebook.db", O_RDONLY); | ||
11 | |||
12 | int infile = open( argv[1], O_RDONLY); | ||
13 | printf( "%i\n", infile ); | ||
14 | |||
15 | unsigned const char xorkey [XORLEN] = "Just for Fun. Linus Torvalds."; | ||
16 | unsigned char input [HUGEBLOCK]; | ||
17 | unsigned char output [HUGEBLOCK]; | ||
18 | unsigned char respath[32]; /* file_XXXXX\0 */ | ||
19 | int i, offs = 0, zres = 0, filenum = 0, resfile, avail=1; | ||
20 | z_stream z; memset( &z, 0, sizeof(z)); | ||
21 | |||
22 | while( avail ) { | ||
23 | do { | ||
24 | lseek( infile, offs, SEEK_SET ); | ||
25 | avail = read( infile, input, HUGEBLOCK ); | ||
26 | if( !avail) break; | ||
27 | for( i=0; i<XORLEN; ++i ) input[i] ^= xorkey[i]; | ||
28 | |||
29 | z.next_in = input; z.avail_in = avail; | ||
30 | z.next_out = output; z.avail_out = HUGEBLOCK; | ||
31 | inflateInit( &z ); zres = inflate( &z, Z_NO_FLUSH ); | ||
32 | |||
33 | if( (zres != Z_OK) && (zres != Z_STREAM_END) ) { | ||
34 | inflateEnd(&z); memset( &z, 0, sizeof(z)); | ||
35 | offs++; | ||
36 | } | ||
37 | } while((zres != Z_OK) && (zres != Z_STREAM_END)); | ||
38 | |||
39 | if( !avail ) break; | ||
40 | if( zres == Z_OK) while( inflate( &z, Z_NO_FLUSH ) == Z_OK ); | ||
41 | |||
42 | sprintf( respath, "file_%05X", filenum++ ); | ||
43 | resfile = open( respath, O_RDWR | O_CREAT, 0644 ); | ||
44 | /* I know, I know, error checking */ | ||
45 | write( resfile, output, z.total_out ); | ||
46 | close( resfile ); | ||
47 | offs += z.total_in; | ||
48 | |||
49 | inflateEnd(&z); memset( &z, 0, sizeof(z)); | ||
50 | } | ||
51 | close( infile ); | ||
52 | } | ||