changing compression ratio formula

intheswim · intheswim · commit fa86c2fb249e · 2021-03-09T23:54:17.000-08:00
diff --git a/lzw16pack.cpp b/lzw16pack.cpp
@@ -512,7 +512,7 @@ int Compress(const char *filename, const char *outfile, int flags)
     long orig_size = fileSize (filename);
     long compressed_size = fileSize (outfile);
 
-    printf ("Compression ratio %.2f%%\n", 100.0 * compressed_size / orig_size);
+    printf ("Compression ratio %.2f%%\n", 100.0 * (orig_size - compressed_size) / orig_size);
   }
 
   return ret;
@@ -539,7 +539,7 @@ int Compress2 (const char *filename, const char *outfile, int flags, int max_bit
     long orig_size = fileSize (filename);
     long compressed_size = fileSize (outfile);
 
-    printf ("Compression ratio %.2f%%\n", 100.0 * compressed_size / orig_size);
+    printf ("Compression ratio %.2f%%\n", 100.0 * (orig_size - compressed_size) / orig_size);
   }
 
   return ret;

Original file line number	Diff line number	Diff line change
`@@ -512,7 +512,7 @@ int Compress(const char filename, const char outfile, int flags)`
`512`	`512`	`long orig_size = fileSize (filename);`
`513`	`513`	`long compressed_size = fileSize (outfile);`
`514`	`514`
`515`		`- printf ("Compression ratio %.2f%%\n", 100.0 * compressed_size / orig_size);`
	`515`	`+ printf ("Compression ratio %.2f%%\n", 100.0 * (orig_size - compressed_size) / orig_size);`
`516`	`516`	`}`
`517`	`517`
`518`	`518`	`return ret;`
`@@ -539,7 +539,7 @@ int Compress2 (const char filename, const char outfile, int flags, int max_bit`
`539`	`539`	`long orig_size = fileSize (filename);`
`540`	`540`	`long compressed_size = fileSize (outfile);`
`541`	`541`
`542`		`- printf ("Compression ratio %.2f%%\n", 100.0 * compressed_size / orig_size);`
	`542`	`+ printf ("Compression ratio %.2f%%\n", 100.0 * (orig_size - compressed_size) / orig_size);`
`543`	`543`	`}`
`544`	`544`
`545`	`545`	`return ret;`