The Tor Browser / file comparison
comparison: netwerk/base/src/nsTemporaryFileInputStream.cpp
netwerk/base/src/nsTemporaryFileInputStream.cpp
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
equal
deleted
inserted
replaced
| -1:000000000000 | 0:52133f5f1a82 |
|---|---|
| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #include "nsTemporaryFileInputStream.h" | |
| 7 #include "nsStreamUtils.h" | |
| 8 #include <algorithm> | |
| 9 | |
| 10 NS_IMPL_ISUPPORTS(nsTemporaryFileInputStream, nsIInputStream) | |
| 11 | |
| 12 nsTemporaryFileInputStream::nsTemporaryFileInputStream(FileDescOwner* aFileDescOwner, uint64_t aStartPos, uint64_t aEndPos) | |
| 13 : mFileDescOwner(aFileDescOwner), | |
| 14 mStartPos(aStartPos), | |
| 15 mEndPos(aEndPos), | |
| 16 mClosed(false) | |
| 17 { | |
| 18 NS_ASSERTION(aStartPos <= aEndPos, "StartPos should less equal than EndPos!"); | |
| 19 } | |
| 20 | |
| 21 NS_IMETHODIMP | |
| 22 nsTemporaryFileInputStream::Close() | |
| 23 { | |
| 24 mClosed = true; | |
| 25 return NS_OK; | |
| 26 } | |
| 27 | |
| 28 NS_IMETHODIMP | |
| 29 nsTemporaryFileInputStream::Available(uint64_t * bytesAvailable) | |
| 30 { | |
| 31 if (mClosed) | |
| 32 return NS_BASE_STREAM_CLOSED; | |
| 33 | |
| 34 NS_ASSERTION(mStartPos <= mEndPos, "StartPos should less equal than EndPos!"); | |
| 35 | |
| 36 *bytesAvailable = mEndPos - mStartPos; | |
| 37 return NS_OK; | |
| 38 } | |
| 39 | |
| 40 NS_IMETHODIMP | |
| 41 nsTemporaryFileInputStream::Read(char* buffer, uint32_t count, uint32_t* bytesRead) | |
| 42 { | |
| 43 return ReadSegments(NS_CopySegmentToBuffer, buffer, count, bytesRead); | |
| 44 } | |
| 45 | |
| 46 NS_IMETHODIMP | |
| 47 nsTemporaryFileInputStream::ReadSegments(nsWriteSegmentFun writer, | |
| 48 void * closure, | |
| 49 uint32_t count, | |
| 50 uint32_t * result) | |
| 51 { | |
| 52 NS_ASSERTION(result, "null ptr"); | |
| 53 NS_ASSERTION(mStartPos <= mEndPos, "bad stream state"); | |
| 54 *result = 0; | |
| 55 | |
| 56 if (mClosed) { | |
| 57 return NS_BASE_STREAM_CLOSED; | |
| 58 } | |
| 59 | |
| 60 mozilla::MutexAutoLock lock(mFileDescOwner->FileMutex()); | |
| 61 PR_Seek64(mFileDescOwner->mFD, mStartPos, PR_SEEK_SET); | |
| 62 | |
| 63 count = std::min(count, uint32_t(mEndPos - mStartPos)); | |
| 64 uint32_t remainBufCount = count; | |
| 65 | |
| 66 char buf[4096]; | |
| 67 while (remainBufCount > 0) { | |
| 68 uint32_t bufCount = std::min(remainBufCount, (uint32_t)sizeof(buf)); | |
| 69 int32_t read_result = PR_Read(mFileDescOwner->mFD, buf, bufCount); | |
| 70 if (read_result < 0) { | |
| 71 return NS_ErrorAccordingToNSPR(); | |
| 72 } | |
| 73 uint32_t write_result = 0; | |
| 74 nsresult rv = writer(this, closure, buf, | |
| 75 count - remainBufCount, bufCount, &write_result); | |
| 76 remainBufCount -= bufCount; | |
| 77 if (NS_SUCCEEDED(rv)) { | |
| 78 NS_ASSERTION(write_result <= bufCount, | |
| 79 "writer should not write more than we asked it to write"); | |
| 80 } | |
| 81 mStartPos += bufCount; | |
| 82 } | |
| 83 *result = count; | |
| 84 return NS_OK; | |
| 85 } | |
| 86 | |
| 87 NS_IMETHODIMP | |
| 88 nsTemporaryFileInputStream::IsNonBlocking(bool * nonBlocking) | |
| 89 { | |
| 90 *nonBlocking = false; | |
| 91 return NS_OK; | |
| 92 } | |
| 93 |
