1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6
7 #include "BlobImpl.h"
8 #include "File.h"
9 #include "mozilla/CheckedInt.h"
10 #include "mozilla/ErrorResult.h"
11 #include "nsIInputStream.h"
12
13 namespace mozilla::dom {
14
15 // Makes sure that aStart and aEnd is less then or equal to aSize and greater
16 // than 0
ParseSize(int64_t aSize,int64_t & aStart,int64_t & aEnd)17 static void ParseSize(int64_t aSize, int64_t& aStart, int64_t& aEnd) {
18 CheckedInt64 newStartOffset = aStart;
19 if (aStart < -aSize) {
20 newStartOffset = 0;
21 } else if (aStart < 0) {
22 newStartOffset += aSize;
23 } else if (aStart > aSize) {
24 newStartOffset = aSize;
25 }
26
27 CheckedInt64 newEndOffset = aEnd;
28 if (aEnd < -aSize) {
29 newEndOffset = 0;
30 } else if (aEnd < 0) {
31 newEndOffset += aSize;
32 } else if (aEnd > aSize) {
33 newEndOffset = aSize;
34 }
35
36 if (!newStartOffset.isValid() || !newEndOffset.isValid() ||
37 newStartOffset.value() >= newEndOffset.value()) {
38 aStart = aEnd = 0;
39 } else {
40 aStart = newStartOffset.value();
41 aEnd = newEndOffset.value();
42 }
43 }
44
Slice(const Optional<int64_t> & aStart,const Optional<int64_t> & aEnd,const nsAString & aContentType,ErrorResult & aRv)45 already_AddRefed<BlobImpl> BlobImpl::Slice(const Optional<int64_t>& aStart,
46 const Optional<int64_t>& aEnd,
47 const nsAString& aContentType,
48 ErrorResult& aRv) {
49 // Truncate aStart and aEnd so that we stay within this file.
50 uint64_t thisLength = GetSize(aRv);
51 if (NS_WARN_IF(aRv.Failed())) {
52 return nullptr;
53 }
54
55 int64_t start = aStart.WasPassed() ? aStart.Value() : 0;
56 int64_t end = aEnd.WasPassed() ? aEnd.Value() : (int64_t)thisLength;
57
58 ParseSize((int64_t)thisLength, start, end);
59
60 nsAutoString type(aContentType);
61 Blob::MakeValidBlobType(type);
62 return CreateSlice((uint64_t)start, (uint64_t)(end - start), type, aRv);
63 }
64
GetSendInfo(nsIInputStream ** aBody,uint64_t * aContentLength,nsACString & aContentType,nsACString & aCharset)65 nsresult BlobImpl::GetSendInfo(nsIInputStream** aBody, uint64_t* aContentLength,
66 nsACString& aContentType, nsACString& aCharset) {
67 MOZ_ASSERT(aContentLength);
68
69 ErrorResult rv;
70
71 nsCOMPtr<nsIInputStream> stream;
72 CreateInputStream(getter_AddRefs(stream), rv);
73 if (NS_WARN_IF(rv.Failed())) {
74 return rv.StealNSResult();
75 }
76
77 *aContentLength = GetSize(rv);
78 if (NS_WARN_IF(rv.Failed())) {
79 return rv.StealNSResult();
80 }
81
82 nsAutoString contentType;
83 GetType(contentType);
84
85 if (contentType.IsEmpty()) {
86 aContentType.SetIsVoid(true);
87 } else {
88 CopyUTF16toUTF8(contentType, aContentType);
89 }
90
91 aCharset.Truncate();
92
93 stream.forget(aBody);
94 return NS_OK;
95 }
96
97 NS_IMPL_ISUPPORTS(BlobImpl, BlobImpl)
98
99 } // namespace mozilla::dom
100