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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
#include "ArchiveZipEvent.h"
#include "ArchiveZipFile.h"
#include "nsContentUtils.h"
#include "nsCExternalHandlerService.h"
#include "mozilla/UniquePtr.h"
using namespace mozilla;
using namespace mozilla::dom;
USING_ARCHIVEREADER_NAMESPACE
#ifndef PATH_MAX
# define PATH_MAX 65536 // The filename length is stored in 2 bytes
#endif
ArchiveZipItem::ArchiveZipItem(const char* aFilename,
const ZipCentral& aCentralStruct,
const nsACString& aEncoding)
: mFilename(aFilename),
mCentralStruct(aCentralStruct),
mEncoding(aEncoding)
{
MOZ_COUNT_CTOR(ArchiveZipItem);
}
ArchiveZipItem::~ArchiveZipItem()
{
MOZ_COUNT_DTOR(ArchiveZipItem);
}
nsresult
ArchiveZipItem::ConvertFilename()
{
if (mEncoding.IsEmpty()) {
return NS_ERROR_FAILURE;
}
nsString filenameU;
nsresult rv = nsContentUtils::ConvertStringFromEncoding(
mEncoding,
mFilename, filenameU);
NS_ENSURE_SUCCESS(rv, rv);
if (filenameU.IsEmpty()) {
return NS_ERROR_FAILURE;
}
mFilenameU = filenameU;
return NS_OK;
}
nsresult
ArchiveZipItem::GetFilename(nsString& aFilename)
{
if (mFilenameU.IsEmpty()) {
// Maybe this string is UTF-8:
if (IsUTF8(mFilename, false)) {
mFilenameU = NS_ConvertUTF8toUTF16(mFilename);
}
// Let's use the enconding value for the dictionary
else {
nsresult rv = ConvertFilename();
NS_ENSURE_SUCCESS(rv, rv);
}
}
aFilename = mFilenameU;
return NS_OK;
}
// From zipItem to File:
already_AddRefed<File>
ArchiveZipItem::GetFile(ArchiveReader* aArchiveReader)
{
nsString filename;
if (NS_FAILED(GetFilename(filename))) {
return nullptr;
}
RefPtr<dom::File> file = dom::File::Create(aArchiveReader,
new ArchiveZipBlobImpl(filename,
NS_ConvertUTF8toUTF16(GetType()),
StrToInt32(mCentralStruct.orglen),
mCentralStruct, aArchiveReader->GetBlobImpl()));
MOZ_ASSERT(file);
return file.forget();
}
uint32_t
ArchiveZipItem::StrToInt32(const uint8_t* aStr)
{
return (uint32_t)( (aStr [0] << 0) |
(aStr [1] << 8) |
(aStr [2] << 16) |
(aStr [3] << 24) );
}
uint16_t
ArchiveZipItem::StrToInt16(const uint8_t* aStr)
{
return (uint16_t) ((aStr [0]) | (aStr [1] << 8));
}
// ArchiveReaderZipEvent
ArchiveReaderZipEvent::ArchiveReaderZipEvent(ArchiveReader* aArchiveReader,
const nsACString& aEncoding)
: ArchiveReaderEvent(aArchiveReader),
mEncoding(aEncoding)
{
}
// NOTE: this runs in a different thread!!
nsresult
ArchiveReaderZipEvent::Exec()
{
uint32_t centralOffset(0);
nsresult rv;
nsCOMPtr<nsIInputStream> inputStream;
rv = mArchiveReader->GetInputStream(getter_AddRefs(inputStream));
if (NS_FAILED(rv) || !inputStream) {
return RunShare(NS_ERROR_UNEXPECTED);
}
// From the input stream to a seekable stream
nsCOMPtr<nsISeekableStream> seekableStream;
seekableStream = do_QueryInterface(inputStream);
if (!seekableStream) {
return RunShare(NS_ERROR_UNEXPECTED);
}
uint64_t size;
rv = mArchiveReader->GetSize(&size);
if (NS_FAILED(rv)) {
return RunShare(NS_ERROR_UNEXPECTED);
}
// Reading backward.. looking for the ZipEnd signature
for (uint64_t curr = size - ZIPEND_SIZE; curr > 4; --curr) {
seekableStream->Seek(nsISeekableStream::NS_SEEK_SET, curr);
uint8_t buffer[ZIPEND_SIZE];
uint32_t ret;
rv = inputStream->Read((char*)buffer, sizeof(buffer), &ret);
if (NS_FAILED(rv) || ret != sizeof(buffer)) {
return RunShare(NS_ERROR_UNEXPECTED);
}
// Here we are:
if (ArchiveZipItem::StrToInt32(buffer) == ENDSIG) {
centralOffset = ArchiveZipItem::StrToInt32(((ZipEnd*)buffer)->offset_central_dir);
break;
}
}
// No central Offset
if (!centralOffset || centralOffset >= size - ZIPEND_SIZE) {
return RunShare(NS_ERROR_FAILURE);
}
// Seek to the first central directory:
seekableStream->Seek(nsISeekableStream::NS_SEEK_SET, centralOffset);
// For each central directory:
while (centralOffset <= size - ZIPCENTRAL_SIZE) {
ZipCentral centralStruct;
uint32_t ret;
rv = inputStream->Read((char*)¢ralStruct, ZIPCENTRAL_SIZE, &ret);
if (NS_FAILED(rv) || ret != ZIPCENTRAL_SIZE) {
return RunShare(NS_ERROR_UNEXPECTED);
}
uint16_t filenameLen = ArchiveZipItem::StrToInt16(centralStruct.filename_len);
uint16_t extraLen = ArchiveZipItem::StrToInt16(centralStruct.extrafield_len);
uint16_t commentLen = ArchiveZipItem::StrToInt16(centralStruct.commentfield_len);
// Point to the next item at the top of loop
centralOffset += ZIPCENTRAL_SIZE + filenameLen + extraLen + commentLen;
if (filenameLen == 0 || filenameLen >= PATH_MAX || centralOffset >= size) {
return RunShare(NS_ERROR_FILE_CORRUPTED);
}
// Read the name:
auto filename = MakeUnique<char[]>(filenameLen + 1);
rv = inputStream->Read(filename.get(), filenameLen, &ret);
if (NS_FAILED(rv) || ret != filenameLen) {
return RunShare(NS_ERROR_UNEXPECTED);
}
filename[filenameLen] = 0;
// We ignore the directories:
if (filename[filenameLen - 1] != '/') {
mFileList.AppendElement(new ArchiveZipItem(filename.get(), centralStruct,
mEncoding));
}
// Ignore the rest
seekableStream->Seek(nsISeekableStream::NS_SEEK_CUR, extraLen + commentLen);
}
return RunShare(NS_OK);
}
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