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-rw-r--r--dom/indexedDB/Key.cpp52
1 files changed, 46 insertions, 6 deletions
diff --git a/dom/indexedDB/Key.cpp b/dom/indexedDB/Key.cpp
index 6f96023a54..7e0c607617 100644
--- a/dom/indexedDB/Key.cpp
+++ b/dom/indexedDB/Key.cpp
@@ -560,6 +560,51 @@ Result<Ok, nsresult> Key::EncodeString(const Span<const T> aInput,
#define KEY_MAXIMUM_BUFFER_LENGTH \
::mozilla::detail::nsTStringLengthStorage<char>::kMax
+void Key::ReserveAutoIncrementKey(bool aFirstOfArray) {
+ // Allocate memory for the new size
+ uint32_t oldLen = mBuffer.Length();
+ char* buffer;
+ if (!mBuffer.GetMutableData(&buffer, oldLen + 1 + sizeof(double))) {
+ return;
+ }
+
+ // Remember the offset of the buffer to be updated later.
+ mAutoIncrementKeyOffsets.AppendElement(oldLen + 1);
+
+ // Fill the type.
+ buffer += oldLen;
+ *(buffer++) = aFirstOfArray ? (eMaxType + eFloat) : eFloat;
+
+ // Fill up with 0xFF to reserve the buffer in fixed size because the encoded
+ // string could be trimmed if ended with padding zeros.
+ mozilla::BigEndian::writeUint64(buffer, UINT64_MAX);
+}
+
+void Key::MaybeUpdateAutoIncrementKey(int64_t aKey) {
+ if (mAutoIncrementKeyOffsets.IsEmpty()) {
+ return;
+ }
+
+ for (uint32_t offset : mAutoIncrementKeyOffsets) {
+ char* buffer;
+ MOZ_ALWAYS_TRUE(mBuffer.GetMutableData(&buffer));
+ buffer += offset;
+ WriteDoubleToUint64(buffer, double(aKey));
+ }
+
+ TrimBuffer();
+}
+
+void Key::WriteDoubleToUint64(char* aBuffer, double aValue) {
+ MOZ_ASSERT(aBuffer);
+
+ uint64_t bits = BitwiseCast<uint64_t>(aValue);
+ const uint64_t signbit = FloatingPoint<double>::kSignBit;
+ uint64_t number = bits & signbit ? (-bits) : (bits | signbit);
+
+ mozilla::BigEndian::writeUint64(aBuffer, number);
+}
+
template <typename T>
Result<Ok, nsresult> Key::EncodeAsString(const Span<const T> aInput,
uint8_t aType) {
@@ -797,13 +842,8 @@ Result<Ok, nsresult> Key::EncodeNumber(double aFloat, uint8_t aType) {
*(buffer++) = aType;
- uint64_t bits = BitwiseCast<uint64_t>(aFloat);
- // Note: The subtraction from 0 below is necessary to fix
- // MSVC build warning C4146 (negating an unsigned value).
- const uint64_t signbit = FloatingPoint<double>::kSignBit;
- uint64_t number = bits & signbit ? (0 - bits) : (bits | signbit);
+ WriteDoubleToUint64(buffer, aFloat);
- mozilla::BigEndian::writeUint64(buffer, number);
return Ok();
}