forked from mirrors/gecko-dev
79 lines
2.2 KiB
C++
79 lines
2.2 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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#ifndef nsGZFileWriter_h
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#define nsGZFileWriter_h
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#include "nsISupportsImpl.h"
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#include "zlib.h"
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#include "nsDependentString.h"
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#include <stdio.h>
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/**
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* A simple class for writing to a .gz file.
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*
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* Note that the file that this interface produces has a different format than
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* what you'd get if you compressed your data as a gzip stream and dumped the
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* result to a file.
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*
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* The standard gunzip tool cannot decompress a raw gzip stream, but can handle
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* the files produced by this interface.
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*/
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class nsGZFileWriter final {
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virtual ~nsGZFileWriter();
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public:
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enum Operation { Append, Create };
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explicit nsGZFileWriter(Operation aMode = Create);
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NS_INLINE_DECL_REFCOUNTING(nsGZFileWriter)
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/**
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* Initialize this object. We'll write our gzip'ed data to the given file,
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* overwriting its contents if the file exists.
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*
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* Init() will return an error if called twice. It's an error to call any
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* other method on this interface without first calling Init().
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*/
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[[nodiscard]] nsresult Init(nsIFile* aFile);
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/**
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* Alternate version of Init() for use when the file is already opened;
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* e.g., with a FileDescriptor passed over IPC.
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*/
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[[nodiscard]] nsresult InitANSIFileDesc(FILE* aFile);
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/**
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* Write the given string to the file.
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*/
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[[nodiscard]] nsresult Write(const nsACString& aStr);
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/**
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* Write |length| bytes of |str| to the file.
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*/
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[[nodiscard]] nsresult Write(const char* aStr, uint32_t aLen) {
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return Write(nsDependentCSubstring(aStr, aLen));
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}
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/**
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* Close this nsGZFileWriter. This method will be run when the underlying
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* object is destroyed, so it's not strictly necessary to explicitly call it
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* from your code.
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*
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* It's an error to call this method twice, and it's an error to call Write()
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* after Finish() has been called.
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*/
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nsresult Finish();
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private:
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Operation mMode;
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bool mInitialized;
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bool mFinished;
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gzFile mGZFile;
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};
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#endif
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