diff --git a/archive.py b/archive.py
index 7ffef68..4f8e5f4 100644
--- a/archive.py
+++ b/archive.py
@@ -104,7 +104,7 @@ class TarSender(ArchiveSender):
         )
 
 
-def crc32(filename):
+def crc32(filename) -> int:
     with open(filename, 'rb') as fh:
         hash = 0
         while True:
@@ -115,7 +115,7 @@ def crc32(filename):
         return hash
 
 
-def zip_local_file_header(filename: str, filepath: str, fileindex: int) -> bytes:
+def zip_local_file_header(filename: str, filepath: str) -> bytes:
     buffer_size = 30 + len(filename)
     buffer = bytearray(buffer_size)
     stat = os.stat(filepath)
@@ -145,7 +145,7 @@ def zip_local_file_header(filename: str, filepath: str, fileindex: int) -> bytes
     buffer[22:26] = stat.st_size.to_bytes(4)
 
     # Field 9: filename length (buffer[26:28])
-    buffer[26:29] = len(filename).to_bytes(4)
+    buffer[26:28] = len(filename).to_bytes(4)
 
     # Field 10: extra field length (buffer[28:30])
 
@@ -155,10 +155,73 @@ def zip_local_file_header(filename: str, filepath: str, fileindex: int) -> bytes
     return buffer
 
 
+def zip_central_directory_file_header(filename: str, filepath: str) -> bytes:
+    buffer_size = 46 + len(filename)
+    buffer = bytearray(buffer_size)
+    stat = os.stat(filepath)
+
+    # Field 1: central directory file header signature (buffer[0:4])
+    buffer[0:4] = b'\x02\x01\x4b\x50'
+
+    # Field 2: version made by (buffer[4:6])
+    buffer[4:6] = b'\x0a'
+
+    # Field 3: version needed to extract (minimum) (buffer[6:8])
+    buffer[6:8] = b'\x0a'
+
+    # Field 3: general purpose bit flag (buffer[8:10]), leave at 0
+
+    # Field 4: compression mode (buffer[10:12]), leave at 0 (uncompressed)
+
+    # Field 5: file last modification time (buffer[12:16])
+    mtime = datetime.fromtimestramp(stat.st_mtime)
+    buffer[12:14] = (mtime.second // 2) | (mtime.minute << 5) | (mtime.hour << 11)
+    buffer[14:16] = mtime.day | (mtime.month << 5) | ((mtime.year - 1980) << 9)
+
+    # Field 6: crc-32 of uncompressed data (buffer[16:20])
+    buffer[16:20] = crc32(filepath).to_bytes(4)
+
+    # Field 7: compressed size (buffer[20:24])
+    buffer[20:24] = stat.st_size.to_bytes(4)
+
+    # Field 8: uncompressed size (buffer[24:28])
+    buffer[24:28] = stat.st_size.to_bytes(4)
+
+    # Field 9: filename length (buffer[28:30])
+    buffer[28:30] = len(filename).to_bytes(4)
+
+    # Field 10: extra field length (buffer[30:32])
+
+    # Field 11: file comment length (buffer[32:34])
+
+    # Field 12: disk number where file starts (buffer[34:36])
+
+    # Field 13: internal file attributes (buffer[36:38])
+
+    # Field 14: external file attributes (buffer[38:42])
+
+    # Field 15: relative offset of the local file header (buffer[42:46])
+
+    # Field 16: filename (buffer[46:46+len(filename)])
+    buffer[46:46+len(filename)] = filename.encode('ascii')
+
+    return buffer
+
+
 class ZipSender(ArchiveSender):
     def response(self):
         def generate():
-            yield 'oops'
+            for name, file in self.files.items():
+                yield zip_local_file_header(name, file)
+
+                with open(file, 'rb') as f:
+                    while True:
+                        bytes = f.read(CHUNK_SIZE)
+
+                        if len(bytes) == 0:
+                            break
+
+                        yield bytes
 
         return Response(
             generate(),