DBCache.bin: Difference between revisions

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The 7.2.0+ replacement for hotfix storage in [[ADB]] and [[Hotfix.tbl]].
#REDIRECT [[ADB#DBCache.bin]]
 
While it appears chunked, it is not. All blocks use the same <tt>'HTFX'</tt> signature, but don't have a size, and have differing content based on location (i.e. the first <tt>'HTFX'</tt> "chunk" is a header for the entire file, individual entries start with <tt>'HTFX'</tt> as well).
 
struct {
  uint32_t signature;        // 'HTFX'
  uint32_t region_ish;        // 3 for eu, 4 for ptr, apparently 1 for us
  uint32_t build;            // client build this cache was created in
#if version >= 7.3.2 PTR
  uint32_t checksum[8];      // SHA? MD5? There is 32 unknown bytes in the header before the entries in 7.3.2 PTR
#endif
} header;
 
Client ignores <tt>region_ish</tt> and <tt>build</tt> blocks that don't match current binary. If header doesn't match, whole file seems ignored.
 
After the header, entries follow:
 
struct {
  uint32_t signature;        // 'HTFX'
  uint32_t region_ish;        // see header.region_ish
  uint32_t index_ish_in_file; // non-contiguous but ascending, sometimes duplicate, weird
  uint32_t size;
  uint32_t table_hash;
  uint32_t id_in_table;
  uint8_t is_valid;
  uint8_t padding[3];        // at least seems uninitialized in 24500
  char data[size];            // format depends on table_hash
} entries[];                  // fill until end of file
 
<tt>index_ish_in_file</tt> is weird since it can be duplicate but same index doesn't mean same <tt>table_hash</tt>, so it isn't "last wins". Possibly something like "push id"? Mirrors Hotfix.log's ClientAvailableHotfixes which infers "push id" is correct

Latest revision as of 22:40, 24 May 2019

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