inflate: Include a test case with zero-length uncompressed block

This is the exact DEFLATE stream reported by Peter Keunecke.

inflate/Makefile

@@ -20,7 +20,7 @@ all: depacker degzip
 # Test harness for inflate.S
 test_inflate: degzip test_inflate.o
 	$(CC) -o $@ $@.o $(LDFLAGS)
-	$(PYTHON) test_inflate.py *.[cSo] *.asm ../cracking/protections/* ../cracking/cracks/nzs/gnu_c/* ../testkit/*
+	$(PYTHON) test_inflate.py *.[cSo] *.asm ../cracking/protections/* ../cracking/cracks/nzs/gnu_c/* ../testkit/* test_assets/*
 
 %.o: %.S
 	$(CC) -o $@ -c $< $(AFLAGS)

inflate/test_inflate.py

@@ -13,6 +13,7 @@
 # Command for creating gzip files.
 GZIP = "zopfli --i32 -c"
 #GZIP = "gzip -c9"
+GUNZIP = "gunzip -c"
 
 HUNK_HEADER = 0x3f3
 HUNK_CODE   = 0x3e9
@@ -34,15 +35,22 @@ def main(argv):
 def test(name):
     print("Testing '%s'..." % name)
 
-    # _test_0: Local copy of original file
-    os.system('cp "' + name + '" ' + PREFIX + '0')
+    if name.endswith('.gz'):
+        # _test_1: Local copy of original gzipped file
+        os.system('cp "' + name + '" ' + PREFIX + '1')
+        # _test_0: Uncompressed file
+        os.system(GUNZIP + ' ' + PREFIX + '1 >' + PREFIX + '0')
+    else:
+        # _test_0: Local copy of original uncompressed file
+        os.system('cp "' + name + '" ' + PREFIX + '0')
+        # _test_1: Gzipped file
+        os.system(GZIP + ' ' + PREFIX + '0 >' + PREFIX + '1')
+
+    # CRC of uncompressed data
     crc16 = crcmod.predefined.Crc('crc-ccitt-false')
     with open(PREFIX + '0', 'rb') as f:
         crc16.update(f.read())
 
-    # _test_1: Gzipped file
-    os.system(GZIP + ' ' + PREFIX + '0 >' + PREFIX + '1')
-
     # _test_2: DEFLATE stream + custom header/footer
     os.system('degzip -H ' + PREFIX + '1 ' + PREFIX + '2')