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 @@
+#include <zlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#define XORLEN (29)
+#define HUGEBLOCK (1024*1024)
+
+int main(int argc, char **argv) {
+//  int infile = open("/Volumes/DasTelefonbuch/atb/phonebook.db", O_RDONLY);
+
+  int infile = open( argv[1], O_RDONLY);
+  printf( "%i\n", infile );
+
+  unsigned const char xorkey [XORLEN] = "Just for Fun. Linus Torvalds.";
+  unsigned char input  [HUGEBLOCK];
+  unsigned char output [HUGEBLOCK];
+  unsigned char respath[32]; /* file_XXXXX\0 */
+  int i, offs = 0, zres = 0, filenum = 0, resfile, avail=1;
+  z_stream z; memset( &z, 0, sizeof(z));
+
+  while( avail ) {
+    do {
+      lseek( infile, offs, SEEK_SET );
+      avail = read( infile, input, HUGEBLOCK );
+      if( !avail) break;
+      for( i=0; i<XORLEN; ++i ) input[i] ^= xorkey[i];
+
+      z.next_in  = input;  z.avail_in  = avail;
+      z.next_out = output; z.avail_out = HUGEBLOCK;
+      inflateInit( &z ); zres = inflate( &z, Z_NO_FLUSH );
+
+      if( (zres != Z_OK) && (zres != Z_STREAM_END) ) {
+        inflateEnd(&z); memset( &z, 0, sizeof(z)); 
+        offs++;
+      }
+    } while((zres != Z_OK) && (zres != Z_STREAM_END));
+
+    if( !avail ) break;
+    if( zres == Z_OK) while( inflate( &z, Z_NO_FLUSH ) == Z_OK );
+
+    sprintf( respath, "file_%05X", filenum++ );
+    resfile = open( respath, O_RDWR | O_CREAT, 0644 );
+    /* I know, I know, error checking */
+    write( resfile, output, z.total_out );
+    close( resfile );
+    offs += z.total_in;
+
+    inflateEnd(&z); memset( &z, 0, sizeof(z)); 
+  }
+  close( infile );
+}