netwerk/cache2/CacheHashUtils.h

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this
   3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 #ifndef CacheHashUtils__h__
   6 #define CacheHashUtils__h__
   7
   8 #include "nsISupports.h"
   9 #include "mozilla/Types.h"
  10 #include "prnetdb.h"
  11 #include "nsPrintfCString.h"
  12
  13 #define LOGSHA1(x) \
  14     PR_htonl((reinterpret_cast<const uint32_t *>(x))[0]), \
  15     PR_htonl((reinterpret_cast<const uint32_t *>(x))[1]), \
  16     PR_htonl((reinterpret_cast<const uint32_t *>(x))[2]), \
  17     PR_htonl((reinterpret_cast<const uint32_t *>(x))[3]), \
  18     PR_htonl((reinterpret_cast<const uint32_t *>(x))[4])
  19
  20 #define SHA1STRING(x) \
  21     (nsPrintfCString("%08x%08x%08x%08x%08x", LOGSHA1(x)).get())
  22
  23 namespace mozilla {
  24 namespace net {
  25
  26 class CacheHash : public nsISupports
  27 {
  28 public:
  29   NS_DECL_THREADSAFE_ISUPPORTS
  30
  31   typedef uint16_t Hash16_t;
  32   typedef uint32_t Hash32_t;
  33
  34   static Hash32_t Hash(const char* aData, uint32_t aSize, uint32_t aInitval=0);
  35   static Hash16_t Hash16(const char* aData, uint32_t aSize,
  36                          uint32_t aInitval=0);
  37
  38   explicit CacheHash(uint32_t aInitval=0);
  39
  40   void     Update(const char *aData, uint32_t aLen);
  41   Hash32_t GetHash();
  42   Hash16_t GetHash16();
  43
  44 private:
  45   virtual ~CacheHash() {}
  46
  47   void Feed(uint32_t aVal, uint8_t aLen = 4);
  48
  49   uint32_t mA, mB, mC;
  50   uint8_t  mPos;
  51   uint32_t mBuf;
  52   uint8_t  mBufPos;
  53   uint32_t mLength;
  54   bool     mFinalized;
  55 };
  56
  57
  58 } // net
  59 } // mozilla
  60
  61 #endif