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+Here are the notes I made while working through the ZIP file specification.
+
+For each file:
+
+ local file header signature 4 bytes (0x04034b50)
+ version needed to extract 2 bytes
+ general purpose bit flag 2 bytes
+ compression method 2 bytes
+ last mod file time 2 bytes
+ last mod file date 2 bytes
+ crc-32 4 bytes
+ compressed size 4 bytes
+ uncompressed size 4 bytes
+ file name length 2 bytes
+ extra field length 2 bytes
+
+|sig |v |g |c |t |d |crc |csz |usz |n |x |
+ PK.. ## 00 00 ?? ?? xxxx ???? ???? ?? 00
+<file name><file data>
+
+Central directory:
+
+ central file header signature 4 bytes (0x02014b50)
+ version made by 2 bytes
+ version needed to extract 2 bytes *
+ general purpose bit flag 2 bytes *
+ compression method 2 bytes *
+ last mod file time 2 bytes *
+ last mod file date 2 bytes *
+ crc-32 4 bytes *
+ compressed size 4 bytes *
+ uncompressed size 4 bytes *
+ file name length 2 bytes *
+ extra field length 2 bytes *
+ file comment length 2 bytes
+ disk number start 2 bytes
+ internal file attributes 2 bytes
+ external file attributes 4 bytes
+ relative offset of local header 4 bytes
+
+ file name (variable size)
+ extra field (variable size)
+ file comment (variable size)
+
+|sig |vm|vx|g |c |d |t |crc |csz |usz |n |x |cm|dn|ia|xa |roff|
+ PK.. ## ## 00 00 ?? ?? xxxx ???? ???? ?? 00 00 00 00 xxxx ????
+
+End of central directory:
+
+ end of central dir signature 4 bytes (0x06054b50)
+ number of this disk 2 bytes
+ number of the disk with the
+ start of the central directory 2 bytes
+ total number of entries in the
+ central directory on this disk 2 bytes
+ total number of entries in
+ the central directory 2 bytes
+ size of the central directory 4 bytes
+ offset of start of central
+ directory with respect to
+ the starting disk number 4 bytes
+ .ZIP file comment length 2 bytes
+ .ZIP file comment (variable size)
+
+|sig |n1|n2|e |ne|size|off |cm|
+ PK.. 00 00 ?? ?? ???? ???? 00