add example of decoding a concatenated zip file

ziplinter-python/test.py

@@ -1,7 +1,26 @@
 import ziplinter
 
 def main():
-    print("{}", ziplinter.parse_file("../testdata/unix.zip"))
+    info = ziplinter.parse_file("../testdata/unix.zip")
+    assert info["comment"] == ""
+
+    # created using `cat utf8-infozip.zip  time-infozip.zip >> concatenated.zip`
+    with open("../testdata/concatenated.zip", "rb") as f:
+        data = f.read()
+
+    info1 = ziplinter.parse_bytes(data)
+
+    start = 0
+    for r in info1["parsed_ranges"]:
+        if r["contains"] == "local file header":
+            start = int(r["start"])
+            break
+
+    assert start == 162 
+
+    info2 = ziplinter.parse_bytes(data[:start])
+
+    assert info1 != info2
 
 if __name__ == '__main__':
     main()

ziplinter/src/snapshots/ziplinter__test__concatenated.zip.snap

@@ -0,0 +1,152 @@
+---
+source: ziplinter/src/lib.rs
+expression: result
+---
+{
+  "comment": "",
+  "contents": [
+    {
+      "central": {
+        "comment": "",
+        "compressed_size": 0,
+        "crc32": 0,
+        "creator_version": {
+          "host_system": "Unix",
+          "version": 30
+        },
+        "disk_nbr_start": 0,
+        "external_attrs": 2175008768,
+        "extra": [
+          85,
+          84,
+          5,
+          0,
+          3,
+          141,
+          73,
+          249,
+          89,
+          117,
+          120,
+          11,
+          0,
+          1,
+          4,
+          232,
+          3,
+          0,
+          0,
+          4,
+          232,
+          3,
+          0,
+          0
+        ],
+        "flags": 0,
+        "header_offset": 0,
+        "internal_attrs": 0,
+        "method": "Store",
+        "mode": 420,
+        "modified": "2017-11-01T04:11:57Z",
+        "name": "test.txt",
+        "reader_version": {
+          "host_system": "MsDos",
+          "version": 10
+        },
+        "uncompressed_size": 0
+      },
+      "local": {
+        "accessed": null,
+        "compressed_size": 0,
+        "crc32": 0,
+        "created": null,
+        "extra": [
+          85,
+          84,
+          9,
+          0,
+          3,
+          141,
+          73,
+          249,
+          89,
+          141,
+          73,
+          249,
+          89,
+          117,
+          120,
+          11,
+          0,
+          1,
+          4,
+          232,
+          3,
+          0,
+          0,
+          4,
+          232,
+          3,
+          0,
+          0
+        ],
+        "flags": 0,
+        "gid": 1000,
+        "header_offset": 0,
+        "method": "Store",
+        "method_specific": "None",
+        "mode": 0,
+        "modified": "2017-11-01T04:11:57Z",
+        "name": "test.txt",
+        "reader_version": {
+          "host_system": "MsDos",
+          "version": 10
+        },
+        "uid": 1000,
+        "uncompressed_size": 0
+      }
+    }
+  ],
+  "encoding": "Utf8",
+  "eocd": {
+    "dir": {
+      "inner": {
+        "dir_disk_nbr": 0,
+        "dir_records_this_disk": 1,
+        "directory_offset": 228,
+        "directory_records": 1,
+        "directory_size": 78,
+        "disk_nbr": 0
+      },
+      "offset": 306
+    },
+    "dir64": null,
+    "global_offset": 162
+  },
+  "parsed_ranges": [
+    {
+      "contains": "end of central directory record",
+      "end": 328,
+      "start": 306
+    },
+    {
+      "contains": "central directory header",
+      "end": 306,
+      "filename": "test.txt",
+      "start": 228
+    },
+    {
+      "contains": "local file header",
+      "end": 228,
+      "filename": "test.txt",
+      "start": 162
+    },
+    {
+      "contains": "file data",
+      "end": 228,
+      "filename": "test.txt",
+      "start": 228
+    }
+  ],
+  "size": 328
+}