title: Git pack file entry format
body: <p>My understanding of the Git pack file format is something like:
  <img src="https://content.screencast.com/users/aggieben/folders/Jing/media/dc42fabf-6fd6-47f3-9244-446b9ec04494/2008-09-16_1424.png" alt="alt text"></p>
  
  <p>Where the table is 32-bits wide, and the first three 32-bit words are the pack file header.  The last row of 32 bits are the first 4 bytes of an entry.  As I understand it, the size of the entry is specified by consecutive bytes with the MSB set, followed by compressed data.  </p>
  
  <p>In the first byte whose MSB is not set, is the MSB part of the compressed data, or is it a  gap?  If it's part of the compressed data, how can you guarantee that when the data is compressed that bit won't be set?</p>