From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 21:33:14 +0200 Subject: Adding upstream version 115.7.0esr. Signed-off-by: Daniel Baumann --- dom/base/ZLibHelper.h | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 dom/base/ZLibHelper.h (limited to 'dom/base/ZLibHelper.h') diff --git a/dom/base/ZLibHelper.h b/dom/base/ZLibHelper.h new file mode 100644 index 0000000000..86de8c4086 --- /dev/null +++ b/dom/base/ZLibHelper.h @@ -0,0 +1,46 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim:set ts=2 sw=2 sts=2 et cindent: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef DOM_ZLIBHELPER_H_ +#define DOM_ZLIBHELPER_H_ + +#include "js/TypeDecls.h" +#include "zlib.h" + +#include "mozilla/dom/CompressionStreamBinding.h" + +namespace mozilla::dom { + +// From the docs in +// https://searchfox.org/mozilla-central/source/modules/zlib/src/zlib.h +inline int8_t ZLibWindowBits(CompressionFormat format) { + switch (format) { + case CompressionFormat::Deflate: + // The windowBits parameter is the base two logarithm of the window size + // (the size of the history buffer). It should be in the range 8..15 for + // this version of the library. Larger values of this parameter result + // in better compression at the expense of memory usage. + return 15; + case CompressionFormat::Deflate_raw: + // windowBits can also be –8..–15 for raw deflate. In this case, + // -windowBits determines the window size. + return -15; + case CompressionFormat::Gzip: + // windowBits can also be greater than 15 for optional gzip encoding. + // Add 16 to windowBits to write a simple gzip header and trailer around + // the compressed data instead of a zlib wrapper. + return 31; + default: + MOZ_ASSERT_UNREACHABLE("Unknown compression format"); + return 0; + } +} + +enum ZLibFlush : uint8_t { No = Z_NO_FLUSH, Yes = Z_FINISH }; + +} // namespace mozilla::dom + +#endif // DOM_ZLIBHELPER_H_ -- cgit v1.2.3