mirror of
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98 lines
2.7 KiB
C++
98 lines
2.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 "nsGZFileWriter.h"
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#include "nsIFile.h"
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#include "nsString.h"
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#include "zlib.h"
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#ifdef XP_WIN
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# include <io.h>
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# define _dup dup
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#else
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# include <unistd.h>
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#endif
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nsGZFileWriter::nsGZFileWriter(Operation aMode)
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: mMode(aMode), mInitialized(false), mFinished(false), mGZFile(nullptr) {}
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nsGZFileWriter::~nsGZFileWriter() {
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if (mInitialized && !mFinished) {
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Finish();
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}
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}
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nsresult nsGZFileWriter::Init(nsIFile* aFile) {
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if (NS_WARN_IF(mInitialized) || NS_WARN_IF(mFinished)) {
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return NS_ERROR_FAILURE;
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}
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// Get a FILE out of our nsIFile. Convert that into a file descriptor which
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// gzip can own. Then close our FILE, leaving only gzip's fd open.
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FILE* file;
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nsresult rv = aFile->OpenANSIFileDesc(mMode == Create ? "wb" : "ab", &file);
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if (NS_WARN_IF(NS_FAILED(rv))) {
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return rv;
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}
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return InitANSIFileDesc(file);
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}
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nsresult nsGZFileWriter::InitANSIFileDesc(FILE* aFile) {
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if (NS_WARN_IF(mInitialized) || NS_WARN_IF(mFinished)) {
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return NS_ERROR_FAILURE;
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}
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mGZFile = gzdopen(dup(fileno(aFile)), mMode == Create ? "wb" : "ab");
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fclose(aFile);
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// gzdopen returns nullptr on error.
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if (NS_WARN_IF(!mGZFile)) {
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return NS_ERROR_FAILURE;
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}
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mInitialized = true;
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return NS_OK;
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}
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nsresult nsGZFileWriter::Write(const nsACString& aStr) {
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if (NS_WARN_IF(!mInitialized) || NS_WARN_IF(mFinished)) {
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return NS_ERROR_FAILURE;
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}
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// gzwrite uses a return value of 0 to indicate failure. Otherwise, it
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// returns the number of uncompressed bytes written. To ensure we can
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// distinguish between success and failure, don't call gzwrite when we have 0
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// bytes to write.
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if (aStr.IsEmpty()) {
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return NS_OK;
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}
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// gzwrite never does a short write -- that is, the return value should
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// always be either 0 or aStr.Length(), and we shouldn't have to call it
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// multiple times in order to get it to read the whole buffer.
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int rv = gzwrite(mGZFile, aStr.BeginReading(), aStr.Length());
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if (NS_WARN_IF(rv != static_cast<int>(aStr.Length()))) {
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return NS_ERROR_FAILURE;
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}
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return NS_OK;
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}
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nsresult nsGZFileWriter::Finish() {
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if (NS_WARN_IF(!mInitialized) || NS_WARN_IF(mFinished)) {
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return NS_ERROR_FAILURE;
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}
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mFinished = true;
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gzclose(mGZFile);
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// Ignore errors from gzclose; it's not like there's anything we can do about
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// it, at this point!
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return NS_OK;
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}
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