summaryrefslogtreecommitdiffstats
path: root/netwerk/base/nsIncrementalStreamLoader.cpp
blob: 8890333f849d2d4951c59ff812cf68862f0b56f9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "nsIncrementalStreamLoader.h"
#include "nsIInputStream.h"
#include "nsIChannel.h"
#include "nsError.h"
#include "GeckoProfiler.h"

#include <limits>

nsIncrementalStreamLoader::nsIncrementalStreamLoader() = default;

nsIncrementalStreamLoader::~nsIncrementalStreamLoader()
{
}

NS_IMETHODIMP
nsIncrementalStreamLoader::Init(nsIIncrementalStreamLoaderObserver* observer)
{
  NS_ENSURE_ARG_POINTER(observer);
  mObserver = observer;
  return NS_OK;
}

nsresult
nsIncrementalStreamLoader::Create(nsISupports *aOuter, REFNSIID aIID, void **aResult)
{
  if (aOuter) return NS_ERROR_NO_AGGREGATION;

  nsIncrementalStreamLoader* it = new nsIncrementalStreamLoader();
  if (it == nullptr)
    return NS_ERROR_OUT_OF_MEMORY;
  NS_ADDREF(it);
  nsresult rv = it->QueryInterface(aIID, aResult);
  NS_RELEASE(it);
  return rv;
}

NS_IMPL_ISUPPORTS(nsIncrementalStreamLoader, nsIIncrementalStreamLoader,
                  nsIRequestObserver, nsIStreamListener,
                  nsIThreadRetargetableStreamListener)

NS_IMETHODIMP
nsIncrementalStreamLoader::GetNumBytesRead(uint32_t* aNumBytes)
{
  *aNumBytes = mBytesRead;
  return NS_OK;
}

/* readonly attribute nsIRequest request; */
NS_IMETHODIMP
nsIncrementalStreamLoader::GetRequest(nsIRequest **aRequest)
{
  NS_IF_ADDREF(*aRequest = mRequest);
  return NS_OK;
}

NS_IMETHODIMP
nsIncrementalStreamLoader::OnStartRequest(nsIRequest* request, nsISupports *ctxt)
{
  nsCOMPtr<nsIChannel> chan( do_QueryInterface(request) );
  if (chan) {
    int64_t contentLength = -1;
    chan->GetContentLength(&contentLength);
    if (contentLength >= 0) {
      if (uint64_t(contentLength) > std::numeric_limits<size_t>::max()) {
        // Too big to fit into size_t, so let's bail.
        return NS_ERROR_OUT_OF_MEMORY;
      }
      // preallocate buffer
      if (!mData.initCapacity(contentLength)) {
        return NS_ERROR_OUT_OF_MEMORY;
      }
    }
  }
  mContext = ctxt;
  return NS_OK;
}

NS_IMETHODIMP
nsIncrementalStreamLoader::OnStopRequest(nsIRequest* request, nsISupports *ctxt,
                                         nsresult aStatus)
{
  PROFILER_LABEL("nsIncrementalStreamLoader", "OnStopRequest",
    js::ProfileEntry::Category::NETWORK);

  if (mObserver) {
    // provide nsIIncrementalStreamLoader::request during call to OnStreamComplete
    mRequest = request;
    size_t length = mData.length();
    uint8_t* elems = mData.extractOrCopyRawBuffer();
    nsresult rv = mObserver->OnStreamComplete(this, mContext, aStatus,
                                              length, elems);
    if (rv != NS_SUCCESS_ADOPTED_DATA) {
      // The observer didn't take ownership of the extracted data buffer, so
      // put it back into mData.
      mData.replaceRawBuffer(elems, length);
    }
    // done.. cleanup
    ReleaseData();
    mRequest = nullptr;
    mObserver = nullptr;
    mContext = nullptr;
  }
  return NS_OK;
}

nsresult
nsIncrementalStreamLoader::WriteSegmentFun(nsIInputStream *inStr,
                                           void *closure,
                                           const char *fromSegment,
                                           uint32_t toOffset,
                                           uint32_t count,
                                           uint32_t *writeCount)
{
  nsIncrementalStreamLoader *self = (nsIncrementalStreamLoader *) closure;

  const uint8_t *data = reinterpret_cast<const uint8_t *>(fromSegment);
  uint32_t consumedCount = 0;
  nsresult rv;
  if (self->mData.empty()) {
    // Shortcut when observer wants to keep the listener's buffer empty.
    rv = self->mObserver->OnIncrementalData(self, self->mContext,
                                            count, data, &consumedCount);

    if (rv != NS_OK) {
      return rv;
    }

    if (consumedCount > count) {
      return NS_ERROR_INVALID_ARG;
    }

    if (consumedCount < count) {
      if (!self->mData.append(fromSegment + consumedCount,
                              count - consumedCount)) {
        self->mData.clearAndFree();
        return NS_ERROR_OUT_OF_MEMORY;
      }
    }
  } else {
    // We have some non-consumed data from previous OnIncrementalData call,
    // appending new data and reporting combined data.
    if (!self->mData.append(fromSegment, count)) {
      self->mData.clearAndFree();
      return NS_ERROR_OUT_OF_MEMORY;
    }
    size_t length = self->mData.length();
    uint32_t reportCount = length > UINT32_MAX ? UINT32_MAX : (uint32_t)length;
    uint8_t* elems = self->mData.extractOrCopyRawBuffer();

    rv = self->mObserver->OnIncrementalData(self, self->mContext,
                                            reportCount, elems, &consumedCount);

    // We still own elems, freeing its memory when exiting scope.
    if (rv != NS_OK) {
      free(elems);
      return rv;
    }

    if (consumedCount > reportCount) {
      free(elems);
      return NS_ERROR_INVALID_ARG;
    }

    if (consumedCount == length) {
      free(elems); // good case -- fully consumed data
    } else {
      // Adopting elems back (at least its portion).
      self->mData.replaceRawBuffer(elems, length);
      if (consumedCount > 0) {
        self->mData.erase(self->mData.begin() + consumedCount);
      }
    }
  }

  *writeCount = count;

  return NS_OK;
}

NS_IMETHODIMP
nsIncrementalStreamLoader::OnDataAvailable(nsIRequest* request, nsISupports *ctxt,
                                nsIInputStream *inStr,
                                uint64_t sourceOffset, uint32_t count)
{
  if (mObserver) {
    // provide nsIIncrementalStreamLoader::request during call to OnStreamComplete
    mRequest = request;
  }
  uint32_t countRead;
  nsresult rv = inStr->ReadSegments(WriteSegmentFun, this, count, &countRead);
  mRequest = nullptr;
  NS_ENSURE_SUCCESS(rv, rv);
  mBytesRead += countRead;
  return rv;
}

void
nsIncrementalStreamLoader::ReleaseData()
{
  mData.clearAndFree();
}

NS_IMETHODIMP
nsIncrementalStreamLoader::CheckListenerChain()
{
  return NS_OK;
}