134 lines
3.0 KiB
C++
134 lines
3.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 "nsScriptableInputStream.h"
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#include "nsMemory.h"
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#include "nsString.h"
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NS_IMPL_ISUPPORTS(nsScriptableInputStream, nsIScriptableInputStream)
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// nsIScriptableInputStream methods
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NS_IMETHODIMP
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nsScriptableInputStream::Close()
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{
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if (!mInputStream) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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return mInputStream->Close();
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}
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NS_IMETHODIMP
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nsScriptableInputStream::Init(nsIInputStream* aInputStream)
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{
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if (!aInputStream) {
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return NS_ERROR_NULL_POINTER;
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}
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mInputStream = aInputStream;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsScriptableInputStream::Available(uint64_t* aResult)
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{
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if (!mInputStream) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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return mInputStream->Available(aResult);
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}
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NS_IMETHODIMP
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nsScriptableInputStream::Read(uint32_t aCount, char** aResult)
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{
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nsresult rv = NS_OK;
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uint64_t count64 = 0;
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char* buffer = nullptr;
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if (!mInputStream) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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rv = mInputStream->Available(&count64);
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if (NS_FAILED(rv)) {
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return rv;
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}
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// bug716556 - Ensure count+1 doesn't overflow
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uint32_t count =
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XPCOM_MIN((uint32_t)XPCOM_MIN<uint64_t>(count64, aCount), UINT32_MAX - 1);
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buffer = (char*)malloc(count + 1); // make room for '\0'
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if (!buffer) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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rv = ReadHelper(buffer, count);
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if (NS_FAILED(rv)) {
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free(buffer);
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return rv;
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}
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buffer[count] = '\0';
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*aResult = buffer;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsScriptableInputStream::ReadBytes(uint32_t aCount, nsACString& aResult)
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{
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if (!mInputStream) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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if (!aResult.SetLength(aCount, fallible)) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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MOZ_ASSERT(aResult.Length() == aCount);
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char* ptr = aResult.BeginWriting();
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nsresult rv = ReadHelper(ptr, aCount);
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if (NS_FAILED(rv)) {
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aResult.Truncate();
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}
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return rv;
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}
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nsresult
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nsScriptableInputStream::ReadHelper(char* aBuffer, uint32_t aCount)
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{
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uint32_t totalBytesRead = 0;
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while (1) {
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uint32_t bytesRead;
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nsresult rv = mInputStream->Read(aBuffer + totalBytesRead,
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aCount - totalBytesRead,
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&bytesRead);
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if (NS_FAILED(rv)) {
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return rv;
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}
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totalBytesRead += bytesRead;
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if (totalBytesRead == aCount) {
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break;
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}
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// If we have read zero bytes, we have hit EOF.
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if (bytesRead == 0) {
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return NS_ERROR_FAILURE;
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}
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}
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return NS_OK;
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}
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nsresult
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nsScriptableInputStream::Create(nsISupports* aOuter, REFNSIID aIID,
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void** aResult)
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{
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if (aOuter) {
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return NS_ERROR_NO_AGGREGATION;
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}
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RefPtr<nsScriptableInputStream> sis = new nsScriptableInputStream();
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return sis->QueryInterface(aIID, aResult);
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}
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