зеркало из https://github.com/mozilla/gecko-dev.git
68 строки
2.0 KiB
C++
68 строки
2.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "BlobImpl.h"
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#include "File.h"
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#include "mozilla/CheckedInt.h"
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namespace mozilla {
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namespace dom {
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// Makes sure that aStart and aEnd is less then or equal to aSize and greater
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// than 0
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static void ParseSize(int64_t aSize, int64_t& aStart, int64_t& aEnd) {
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CheckedInt64 newStartOffset = aStart;
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if (aStart < -aSize) {
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newStartOffset = 0;
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} else if (aStart < 0) {
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newStartOffset += aSize;
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} else if (aStart > aSize) {
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newStartOffset = aSize;
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}
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CheckedInt64 newEndOffset = aEnd;
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if (aEnd < -aSize) {
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newEndOffset = 0;
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} else if (aEnd < 0) {
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newEndOffset += aSize;
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} else if (aEnd > aSize) {
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newEndOffset = aSize;
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}
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if (!newStartOffset.isValid() || !newEndOffset.isValid() ||
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newStartOffset.value() >= newEndOffset.value()) {
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aStart = aEnd = 0;
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} else {
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aStart = newStartOffset.value();
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aEnd = newEndOffset.value();
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}
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}
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already_AddRefed<BlobImpl> BlobImpl::Slice(const Optional<int64_t>& aStart,
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const Optional<int64_t>& aEnd,
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const nsAString& aContentType,
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ErrorResult& aRv) {
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// Truncate aStart and aEnd so that we stay within this file.
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uint64_t thisLength = GetSize(aRv);
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if (NS_WARN_IF(aRv.Failed())) {
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return nullptr;
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}
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int64_t start = aStart.WasPassed() ? aStart.Value() : 0;
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int64_t end = aEnd.WasPassed() ? aEnd.Value() : (int64_t)thisLength;
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ParseSize((int64_t)thisLength, start, end);
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nsAutoString type(aContentType);
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Blob::MakeValidBlobType(type);
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return CreateSlice((uint64_t)start, (uint64_t)(end - start), type, aRv);
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}
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NS_IMPL_ISUPPORTS(BlobImpl, BlobImpl)
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} // namespace dom
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} // namespace mozilla
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