зеркало из https://github.com/mozilla/gecko-dev.git
78 строки
1.7 KiB
C++
78 строки
1.7 KiB
C++
/* 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 "mozilla/Unused.h"
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#include "SinfParser.h"
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#include "AtomType.h"
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#include "Box.h"
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#include "ByteStream.h"
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namespace mozilla {
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Sinf::Sinf(Box& aBox)
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: mDefaultIVSize(0)
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, mDefaultEncryptionType()
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{
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SinfParser parser(aBox);
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if (parser.GetSinf().IsValid()) {
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*this = parser.GetSinf();
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}
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}
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SinfParser::SinfParser(Box& aBox)
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{
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for (Box box = aBox.FirstChild(); box.IsAvailable(); box = box.Next()) {
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if (box.IsType("schm")) {
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mozilla::Unused << ParseSchm(box);
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} else if (box.IsType("schi")) {
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mozilla::Unused << ParseSchi(box);
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}
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}
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}
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Result<Ok, nsresult>
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SinfParser::ParseSchm(Box& aBox)
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{
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BoxReader reader(aBox);
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if (reader->Remaining() < 8) {
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return Err(NS_ERROR_FAILURE);
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}
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MOZ_TRY(reader->ReadU32()); // flags -- ignore
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MOZ_TRY_VAR(mSinf.mDefaultEncryptionType, reader->ReadU32());
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return Ok();
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}
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Result<Ok, nsresult>
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SinfParser::ParseSchi(Box& aBox)
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{
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for (Box box = aBox.FirstChild(); box.IsAvailable(); box = box.Next()) {
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if (box.IsType("tenc") && ParseTenc(box).isErr()) {
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return Err(NS_ERROR_FAILURE);
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}
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}
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return Ok();
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}
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Result<Ok, nsresult>
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SinfParser::ParseTenc(Box& aBox)
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{
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BoxReader reader(aBox);
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if (reader->Remaining() < 24) {
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return Err(NS_ERROR_FAILURE);
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}
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MOZ_TRY(reader->ReadU32()); // flags -- ignore
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uint32_t isEncrypted;
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MOZ_TRY_VAR(isEncrypted, reader->ReadU24());
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MOZ_TRY_VAR(mSinf.mDefaultIVSize, reader->ReadU8());
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memcpy(mSinf.mDefaultKeyID, reader->Read(16), 16);
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return Ok();
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}
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}
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