1 files changed, 235 insertions, 0 deletions
diff --git a/netwerk/cache2/CacheHashUtils.cpp b/netwerk/cache2/CacheHashUtils.cpp
new file mode 100644
index 0000000000..1a33b00603
--- /dev/null
+++ b/netwerk/cache2/CacheHashUtils.cpp
@@ -0,0 +1,235 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "CacheHashUtils.h"
+
+#include "mozilla/BasePrincipal.h"
+#include "plstr.h"
+
+namespace mozilla {
+namespace net {
+
+/**
+ *  CacheHash::Hash(const char * key, uint32_t initval)
+ *
+ *  See http://burtleburtle.net/bob/hash/evahash.html for more information
+ *  about this hash function.
+ *
+ *  This algorithm is used to check the data integrity.
+ */
+
+static inline void hashmix(uint32_t& a, uint32_t& b, uint32_t& c) {
+  a -= b;
+  a -= c;
+  a ^= (c >> 13);
+  b -= c;
+  b -= a;
+  b ^= (a << 8);
+  c -= a;
+  c -= b;
+  c ^= (b >> 13);
+  a -= b;
+  a -= c;
+  a ^= (c >> 12);
+  b -= c;
+  b -= a;
+  b ^= (a << 16);
+  c -= a;
+  c -= b;
+  c ^= (b >> 5);
+  a -= b;
+  a -= c;
+  a ^= (c >> 3);
+  b -= c;
+  b -= a;
+  b ^= (a << 10);
+  c -= a;
+  c -= b;
+  c ^= (b >> 15);
+}
+
+CacheHash::Hash32_t CacheHash::Hash(const char* aData, uint32_t aSize,
+                                    uint32_t aInitval) {
+  const uint8_t* k = reinterpret_cast<const uint8_t*>(aData);
+  uint32_t a, b, c, len;
+
+  /* Set up the internal state */
+  len = aSize;
+  a = b = 0x9e3779b9; /* the golden ratio; an arbitrary value */
+  c = aInitval;       /* variable initialization of internal state */
+
+  /*---------------------------------------- handle most of the key */
+  while (len >= 12) {
+    a += k[0] + (uint32_t(k[1]) << 8) + (uint32_t(k[2]) << 16) +
+         (uint32_t(k[3]) << 24);
+    b += k[4] + (uint32_t(k[5]) << 8) + (uint32_t(k[6]) << 16) +
+         (uint32_t(k[7]) << 24);
+    c += k[8] + (uint32_t(k[9]) << 8) + (uint32_t(k[10]) << 16) +
+         (uint32_t(k[11]) << 24);
+    hashmix(a, b, c);
+    k += 12;
+    len -= 12;
+  }
+
+  /*------------------------------------- handle the last 11 bytes */
+  c += aSize;
+  switch (len) { /* all the case statements fall through */
+    case 11:
+      c += (uint32_t(k[10]) << 24);
+      [[fallthrough]];
+    case 10:
+      c += (uint32_t(k[9]) << 16);
+      [[fallthrough]];
+    case 9:
+      c += (uint32_t(k[8]) << 8);
+      [[fallthrough]];
+    /* the low-order byte of c is reserved for the length */
+    case 8:
+      b += (uint32_t(k[7]) << 24);
+      [[fallthrough]];
+    case 7:
+      b += (uint32_t(k[6]) << 16);
+      [[fallthrough]];
+    case 6:
+      b += (uint32_t(k[5]) << 8);
+      [[fallthrough]];
+    case 5:
+      b += k[4];
+      [[fallthrough]];
+    case 4:
+      a += (uint32_t(k[3]) << 24);
+      [[fallthrough]];
+    case 3:
+      a += (uint32_t(k[2]) << 16);
+      [[fallthrough]];
+    case 2:
+      a += (uint32_t(k[1]) << 8);
+      [[fallthrough]];
+    case 1:
+      a += k[0];
+      /* case 0: nothing left to add */
+  }
+  hashmix(a, b, c);
+
+  return c;
+}
+
+CacheHash::Hash16_t CacheHash::Hash16(const char* aData, uint32_t aSize,
+                                      uint32_t aInitval) {
+  Hash32_t hash = Hash(aData, aSize, aInitval);
+  return (hash & 0xFFFF);
+}
+
+NS_IMPL_ISUPPORTS0(CacheHash)
+
+CacheHash::CacheHash(uint32_t aInitval)
+    : mA(0x9e3779b9),
+      mB(0x9e3779b9),
+      mC(aInitval),
+      mPos(0),
+      mBuf(0),
+      mBufPos(0),
+      mLength(0),
+      mFinalized(false) {}
+
+void CacheHash::Feed(uint32_t aVal, uint8_t aLen) {
+  switch (mPos) {
+    case 0:
+      mA += aVal;
+      mPos++;
+      break;
+
+    case 1:
+      mB += aVal;
+      mPos++;
+      break;
+
+    case 2:
+      mPos = 0;
+      if (aLen == 4) {
+        mC += aVal;
+        hashmix(mA, mB, mC);
+      } else {
+        mC += aVal << 8;
+      }
+  }
+
+  mLength += aLen;
+}
+
+void CacheHash::Update(const char* aData, uint32_t aLen) {
+  const uint8_t* data = reinterpret_cast<const uint8_t*>(aData);
+
+  MOZ_ASSERT(!mFinalized);
+
+  if (mBufPos) {
+    while (mBufPos != 4 && aLen) {
+      mBuf += uint32_t(*data) << 8 * mBufPos;
+      data++;
+      mBufPos++;
+      aLen--;
+    }
+
+    if (mBufPos == 4) {
+      mBufPos = 0;
+      Feed(mBuf);
+      mBuf = 0;
+    }
+  }
+
+  if (!aLen) return;
+
+  while (aLen >= 4) {
+    Feed(data[0] + (uint32_t(data[1]) << 8) + (uint32_t(data[2]) << 16) +
+         (uint32_t(data[3]) << 24));
+    data += 4;
+    aLen -= 4;
+  }
+
+  switch (aLen) {
+    case 3:
+      mBuf += data[2] << 16;
+      [[fallthrough]];
+    case 2:
+      mBuf += data[1] << 8;
+      [[fallthrough]];
+    case 1:
+      mBuf += data[0];
+  }
+
+  mBufPos = aLen;
+}
+
+CacheHash::Hash32_t CacheHash::GetHash() {
+  if (!mFinalized) {
+    if (mBufPos) {
+      Feed(mBuf, mBufPos);
+    }
+    mC += mLength;
+    hashmix(mA, mB, mC);
+    mFinalized = true;
+  }
+
+  return mC;
+}
+
+CacheHash::Hash16_t CacheHash::GetHash16() {
+  Hash32_t hash = GetHash();
+  return (hash & 0xFFFF);
+}
+
+OriginAttrsHash GetOriginAttrsHash(const mozilla::OriginAttributes& aOA) {
+  nsAutoCString suffix;
+  aOA.CreateSuffix(suffix);
+
+  SHA1Sum sum;
+  SHA1Sum::Hash hash;
+  sum.update(suffix.BeginReading(), suffix.Length());
+  sum.finish(hash);
+
+  return BigEndian::readUint64(&hash);
+}
+
+}  // namespace net
+}  // namespace mozilla