The Tor Browser / file comparison
comparison: xpcom/io/nsScriptableInputStream.cpp
xpcom/io/nsScriptableInputStream.cpp
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
equal
deleted
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replaced
| -1:000000000000 | 0:9357eccd1316 |
|---|---|
| 1 /* -*- Mode: C++; tab-width: 4; 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 "nsScriptableInputStream.h" | |
| 7 #include "nsMemory.h" | |
| 8 #include "nsString.h" | |
| 9 | |
| 10 NS_IMPL_ISUPPORTS(nsScriptableInputStream, nsIScriptableInputStream) | |
| 11 | |
| 12 // nsIScriptableInputStream methods | |
| 13 NS_IMETHODIMP | |
| 14 nsScriptableInputStream::Close(void) { | |
| 15 if (!mInputStream) return NS_ERROR_NOT_INITIALIZED; | |
| 16 return mInputStream->Close(); | |
| 17 } | |
| 18 | |
| 19 NS_IMETHODIMP | |
| 20 nsScriptableInputStream::Init(nsIInputStream *aInputStream) { | |
| 21 if (!aInputStream) return NS_ERROR_NULL_POINTER; | |
| 22 mInputStream = aInputStream; | |
| 23 return NS_OK; | |
| 24 } | |
| 25 | |
| 26 NS_IMETHODIMP | |
| 27 nsScriptableInputStream::Available(uint64_t *_retval) { | |
| 28 if (!mInputStream) return NS_ERROR_NOT_INITIALIZED; | |
| 29 return mInputStream->Available(_retval); | |
| 30 } | |
| 31 | |
| 32 NS_IMETHODIMP | |
| 33 nsScriptableInputStream::Read(uint32_t aCount, char **_retval) { | |
| 34 nsresult rv = NS_OK; | |
| 35 uint64_t count64 = 0; | |
| 36 char *buffer = nullptr; | |
| 37 | |
| 38 if (!mInputStream) return NS_ERROR_NOT_INITIALIZED; | |
| 39 | |
| 40 rv = mInputStream->Available(&count64); | |
| 41 if (NS_FAILED(rv)) return rv; | |
| 42 | |
| 43 // bug716556 - Ensure count+1 doesn't overflow | |
| 44 uint32_t count = XPCOM_MIN((uint32_t)XPCOM_MIN<uint64_t>(count64, aCount), UINT32_MAX - 1); | |
| 45 buffer = (char*)moz_malloc(count+1); // make room for '\0' | |
| 46 if (!buffer) return NS_ERROR_OUT_OF_MEMORY; | |
| 47 | |
| 48 rv = ReadHelper(buffer, count); | |
| 49 if (NS_FAILED(rv)) { | |
| 50 nsMemory::Free(buffer); | |
| 51 return rv; | |
| 52 } | |
| 53 | |
| 54 buffer[count] = '\0'; | |
| 55 *_retval = buffer; | |
| 56 return NS_OK; | |
| 57 } | |
| 58 | |
| 59 NS_IMETHODIMP | |
| 60 nsScriptableInputStream::ReadBytes(uint32_t aCount, nsACString &_retval) { | |
| 61 if (!mInputStream) { | |
| 62 return NS_ERROR_NOT_INITIALIZED; | |
| 63 } | |
| 64 | |
| 65 _retval.SetLength(aCount); | |
| 66 if (_retval.Length() != aCount) { | |
| 67 return NS_ERROR_OUT_OF_MEMORY; | |
| 68 } | |
| 69 | |
| 70 char *ptr = _retval.BeginWriting(); | |
| 71 nsresult rv = ReadHelper(ptr, aCount); | |
| 72 if (NS_FAILED(rv)) { | |
| 73 _retval.Truncate(); | |
| 74 } | |
| 75 return rv; | |
| 76 } | |
| 77 | |
| 78 nsresult | |
| 79 nsScriptableInputStream::ReadHelper(char* aBuffer, uint32_t aCount) | |
| 80 { | |
| 81 uint32_t totalBytesRead = 0; | |
| 82 while (1) { | |
| 83 uint32_t bytesRead; | |
| 84 nsresult rv = mInputStream->Read(aBuffer + totalBytesRead, | |
| 85 aCount - totalBytesRead, | |
| 86 &bytesRead); | |
| 87 if (NS_FAILED(rv)) { | |
| 88 return rv; | |
| 89 } | |
| 90 | |
| 91 totalBytesRead += bytesRead; | |
| 92 if (totalBytesRead == aCount) { | |
| 93 break; | |
| 94 } | |
| 95 | |
| 96 // If we have read zero bytes, we have hit EOF. | |
| 97 if (bytesRead == 0) { | |
| 98 return NS_ERROR_FAILURE; | |
| 99 } | |
| 100 | |
| 101 } | |
| 102 return NS_OK; | |
| 103 } | |
| 104 | |
| 105 nsresult | |
| 106 nsScriptableInputStream::Create(nsISupports *aOuter, REFNSIID aIID, void **aResult) { | |
| 107 if (aOuter) return NS_ERROR_NO_AGGREGATION; | |
| 108 | |
| 109 nsScriptableInputStream *sis = new nsScriptableInputStream(); | |
| 110 if (!sis) return NS_ERROR_OUT_OF_MEMORY; | |
| 111 | |
| 112 NS_ADDREF(sis); | |
| 113 nsresult rv = sis->QueryInterface(aIID, aResult); | |
| 114 NS_RELEASE(sis); | |
| 115 return rv; | |
| 116 } |
