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
  25 class OriginAttributes;
  26
  27 namespace net {
  28
  29 class CacheHash : public nsISupports {
  30  public:
  31   NS_DECL_THREADSAFE_ISUPPORTS
  32
  33   using Hash16_t = uint16_t;
  34   using Hash32_t = uint32_t;
  35
  36   static Hash32_t Hash(const char* aData, uint32_t aSize,
  37                        uint32_t aInitval = 0);
  38   static Hash16_t Hash16(const char* aData, uint32_t aSize,
  39                          uint32_t aInitval = 0);
  40
  41   explicit CacheHash(uint32_t aInitval = 0);
  42
  43   void Update(const char* aData, uint32_t aLen);
  44   Hash32_t GetHash();
  45   Hash16_t GetHash16();
  46
  47  private:
  48   virtual ~CacheHash() = default;
  49
  50   void Feed(uint32_t aVal, uint8_t aLen = 4);
  51
  52   static const uint32_t kGoldenRation = 0x9e3779b9;
  53
  54   uint32_t mA{kGoldenRation}, mB{kGoldenRation}, mC;
  55   uint8_t mPos{0};
  56   uint32_t mBuf{0};
  57   uint8_t mBufPos{0};
  58   uint32_t mLength{0};
  59   bool mFinalized{false};
  60 };
  61
  62 using OriginAttrsHash = uint64_t;
  63
  64 OriginAttrsHash GetOriginAttrsHash(const mozilla::OriginAttributes& aOA);
  65
  66 }  // namespace net
  67 }  // namespace mozilla
  68
  69 #endif