From 73827ba1f4a50107272d6e465b92f356fb9e0abe Mon Sep 17 00:00:00 2001
From: erdgeist <>
Date: Sun, 9 May 2004 14:53:42 +0000
Subject: initial

---
 src/extractstreets.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 src/extractstreets.c

(limited to 'src/extractstreets.c')

diff --git a/src/extractstreets.c b/src/extractstreets.c
new file mode 100644
index 0000000..097a736
--- /dev/null
+++ b/src/extractstreets.c
@@ -0,0 +1,66 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <strings.h>
+#include <stdio.h>
+#include <fcntl.h>
+
+int main( int args, char **argv )
+{
+  int            toindex;
+  int            i, run = 1, filenum = 0, offset = 0, oldoffset = -1;
+  struct stat    fstatus;
+  unsigned char *mappedfile;
+
+  if( args != 2 )
+    { fputs( "Missing filenames.", stderr ); exit( 1 ); }
+
+  if( ( toindex = open( argv[1], O_RDONLY ) ) < 0 )
+    { fprintf( stderr, "Can't open file: %s.\n", argv[1] ); exit( toindex ); }
+
+  fstat( toindex, &fstatus );
+
+  printf( "Size of file: %d\n", fstatus.st_size );
+
+  if( ( mappedfile = mmap( NULL, (size_t)fstatus.st_size, PROT_READ | PROT_WRITE, MAP_NOCORE | MAP_PRIVATE, toindex, 0) ) == MAP_FAILED )
+    { fprintf( stderr, "Can't mmap file: %s.", argv[1] ); exit( 1 ); }
+
+  while( run )
+  {
+    while( ( offset < fstatus.st_size ) && (
+           ( mappedfile[ offset + 0 ] != 0x22 ) ||
+           ( mappedfile[ offset + 2 ] != 0x2d ) ||
+           ( mappedfile[ offset + 3 ] != 0x6c ) ||
+           ( mappedfile[ offset + 4 ] != 0x68 ) ||
+         ( ( mappedfile[ offset + 5 ] != 0x35 ) && ( mappedfile[ offset + 5 ] != 0x30 )) ||
+           ( mappedfile[ offset + 6 ] != 0x2d )
+          ) ) offset++;
+
+    printf( "Found an appropriate offset at: %d\n", oldoffset );
+
+    if( offset == fstatus.st_size )
+      run = 0;
+
+    if( oldoffset != -1 )
+    {
+        unsigned long *mf = (unsigned long*)(mappedfile + oldoffset);
+        unsigned char filename[20], cs = 0;
+
+        snprintf( filename, sizeof( filename ), "%012d.lha", filenum++ );
+
+        memcpy( ((unsigned char*)mf) + 22, filename, 12);
+
+        for( i=2; i<36; ++i)
+          cs += ((unsigned char*)mf)[i];
+        ((unsigned char*)mf)[1] = cs;
+
+        i = open( filename, O_CREAT | O_TRUNC | O_WRONLY, 0644 );
+        write( i, mf, offset - oldoffset );
+        close( i );
+    }
+    oldoffset = offset;
+    offset++;
+  }
+
+  return 0;
+}
-- 
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