Import minamp 1.0 source

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tools/zipalign.py

@@ -0,0 +1,51 @@
+"""zipalign replacement: rewrites an APK so every STORED entry's data starts on a 4-byte boundary.
+
+Re-compressing deflated entries doesn't break the v1 (JAR) signature, which covers uncompressed
+contents only.
+"""
+import struct
+import sys
+import zipfile
+
+ALIGN = 4
+
+
+def align(src, dst):
+    zin = zipfile.ZipFile(src)
+    with zipfile.ZipFile(dst, "w") as zout:
+        for info in zin.infolist():
+            data = zin.read(info.filename)
+            zi = zipfile.ZipInfo(info.filename, date_time=info.date_time)
+            zi.compress_type = info.compress_type
+            zi.external_attr = info.external_attr
+            zi.create_system = info.create_system
+            extra = b""
+            if info.compress_type == zipfile.ZIP_STORED:
+                offset = zout.fp.tell()
+                name_len = len(zi.filename.encode("utf-8"))
+                base = offset + 30 + name_len + 6  # 6 = our extra-field header + alignment value
+                pad = (ALIGN - base % ALIGN) % ALIGN
+                # 0xD935 is the extra-field id Android's own zipalign uses for padding
+                extra = struct.pack("<HHH", 0xD935, 2 + pad, ALIGN) + b"\0" * pad
+            zi.extra = extra
+            zout.writestr(zi, data)
+    verify(dst)
+
+
+def verify(path):
+    z = zipfile.ZipFile(path)
+    raw = open(path, "rb").read()
+    for info in z.infolist():
+        if info.compress_type != zipfile.ZIP_STORED:
+            continue
+        o = info.header_offset
+        n, e = struct.unpack("<HH", raw[o + 26:o + 30])
+        start = o + 30 + n + e
+        if start % ALIGN:
+            raise SystemExit("misaligned: %s at %d" % (info.filename, start))
+    if z.testzip() is not None:
+        raise SystemExit("corrupt zip")
+
+
+if __name__ == "__main__":
+    align(sys.argv[1], sys.argv[2])