crccache/crccache.h

   1 /*
   2  * crccache.h
   3  *
   4  * Common files for crccache client and server apache modules
   5  *
   6  *  Created on: 21/02/2009
   7  *      Author: Toby Collett
   8  *      Contributor: Alex Wulms
   9  */
  10
  11 #ifndef CRCCACHE_H_
  12 #define CRCCACHE_H_
  13
  14 #include <stdint.h>
  15
  16 #ifndef MAX
  17 #define MAX(a,b)                ((a) > (b) ? (a) : (b))
  18 #endif
  19 #ifndef MIN
  20 #define MIN(a,b)                ((a) < (b) ? (a) : (b))
  21 #endif
  22
  23 const char * CRCCACHE_ENCODING = "crcsync";
  24 const char * ENCODING_HEADER = "Content-Encoding";
  25 const char * BLOCK_HEADER = "If-Block";
  26 const char * VARY_HEADER = "Vary";
  27 const char * VARY_VALUE = "If-Block";
  28 // hashes per file
  29 #define FULL_BLOCK_COUNT 40
  30 const int HASH_SIZE=64; // bits per has, 30 bits is 5 bytes base 64
  31
  32 // HASH_SIZE_BYTES*(FULL_BLOCK_COUNT+1)*4/3 rounded up to the nearest multiple of 3
  33 // 8*(40+1)*4/3 = 438
  34 const int HASH_HEADER_SIZE=438;
  35
  36
  37 const unsigned char ENCODING_LITERAL='L';
  38 const unsigned char ENCODING_BLOCK='B';
  39 const unsigned char ENCODING_COMPRESSED='Z';
  40 const unsigned char ENCODING_HASH='S';
  41
  42 const int ENCODING_COMPRESSED_HEADER_SIZE = 1;// 1 byte indicator
  43 const int ENCODING_LITERAL_HEADER_SIZE = 1+4;// 1 byte indicator + 4 bytes length
  44 const int ENCODING_BLOCK_HEADER_SIZE = 1+1;// 1 byte indicator + 1 byte block
  45
  46 #endif /* CRCCACHE_H_ */