gecko-dev/dom/archivereader/ArchiveZipFile.cpp

401 lines
9.2 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=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 "ArchiveZipFile.h"
#include "ArchiveZipEvent.h"
#include "nsIInputStream.h"
#include "zlib.h"
#include "mozilla/Attributes.h"
#include "mozilla/dom/File.h"
using namespace mozilla::dom;
USING_ARCHIVEREADER_NAMESPACE
#define ZIP_CHUNK 16384
/**
* Input stream object for zip files
*/
class ArchiveInputStream MOZ_FINAL : public nsIInputStream,
public nsISeekableStream
{
public:
ArchiveInputStream(uint64_t aParentSize,
nsIInputStream* aInputStream,
nsString& aFilename,
uint32_t aStart,
uint32_t aLength,
ZipCentral& aCentral)
: mCentral(aCentral),
mFilename(aFilename),
mStart(aStart),
mLength(aLength),
mStatus(NotStarted)
{
MOZ_COUNT_CTOR(ArchiveInputStream);
// Reset the data:
memset(&mData, 0, sizeof(mData));
mData.parentSize = aParentSize;
mData.inputStream = aInputStream;
}
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIINPUTSTREAM
NS_DECL_NSISEEKABLESTREAM
private:
virtual ~ArchiveInputStream()
{
MOZ_COUNT_DTOR(ArchiveInputStream);
Close();
}
nsresult Init();
private: // data
ZipCentral mCentral;
nsString mFilename;
uint32_t mStart;
uint32_t mLength;
z_stream mZs;
enum {
NotStarted,
Started,
Done
} mStatus;
struct {
uint64_t parentSize;
nsCOMPtr<nsIInputStream> inputStream;
unsigned char input[ZIP_CHUNK];
uint32_t sizeToBeRead;
uint32_t cursor;
bool compressed; // a zip file can contain stored or compressed files
} mData;
};
NS_IMPL_ISUPPORTS(ArchiveInputStream,
nsIInputStream,
nsISeekableStream)
nsresult
ArchiveInputStream::Init()
{
nsresult rv;
memset(&mZs, 0, sizeof(z_stream));
int zerr = inflateInit2(&mZs, -MAX_WBITS);
if (zerr != Z_OK) {
return NS_ERROR_OUT_OF_MEMORY;
}
mData.sizeToBeRead = ArchiveZipItem::StrToInt32(mCentral.size);
uint32_t offset = ArchiveZipItem::StrToInt32(mCentral.localhdr_offset);
// The file is corrupt
if (offset + ZIPLOCAL_SIZE > mData.parentSize) {
return NS_ERROR_UNEXPECTED;
}
// From the input stream to a seekable stream
nsCOMPtr<nsISeekableStream> seekableStream;
seekableStream = do_QueryInterface(mData.inputStream);
if (!seekableStream) {
return NS_ERROR_UNEXPECTED;
}
// Seek + read the ZipLocal struct
seekableStream->Seek(nsISeekableStream::NS_SEEK_SET, offset);
uint8_t buffer[ZIPLOCAL_SIZE];
uint32_t ret;
rv = mData.inputStream->Read((char*)buffer, ZIPLOCAL_SIZE, &ret);
if (NS_FAILED(rv) || ret != ZIPLOCAL_SIZE) {
return NS_ERROR_UNEXPECTED;
}
// Signature check:
if (ArchiveZipItem::StrToInt32(buffer) != LOCALSIG) {
return NS_ERROR_UNEXPECTED;
}
ZipLocal local;
memcpy(&local, buffer, ZIPLOCAL_SIZE);
// Seek to the real data:
offset += ZIPLOCAL_SIZE +
ArchiveZipItem::StrToInt16(local.filename_len) +
ArchiveZipItem::StrToInt16(local.extrafield_len);
// The file is corrupt if there is not enough data
if (offset + mData.sizeToBeRead > mData.parentSize) {
return NS_ERROR_UNEXPECTED;
}
// Data starts here:
seekableStream->Seek(nsISeekableStream::NS_SEEK_SET, offset);
// The file is compressed or not?
mData.compressed = (ArchiveZipItem::StrToInt16(mCentral.method) != 0);
// We have to skip the first mStart bytes:
if (mStart != 0) {
rv = Seek(NS_SEEK_SET, mStart);
NS_ENSURE_SUCCESS(rv, rv);
}
return NS_OK;
}
NS_IMETHODIMP
ArchiveInputStream::Close()
{
if (mStatus != NotStarted) {
inflateEnd(&mZs);
mStatus = NotStarted;
}
return NS_OK;
}
NS_IMETHODIMP
ArchiveInputStream::Available(uint64_t* _retval)
{
*_retval = mLength - mData.cursor - mStart;
return NS_OK;
}
NS_IMETHODIMP
ArchiveInputStream::Read(char* aBuffer,
uint32_t aCount,
uint32_t* _retval)
{
NS_ENSURE_ARG_POINTER(aBuffer);
NS_ENSURE_ARG_POINTER(_retval);
nsresult rv;
// This is the first time:
if (mStatus == NotStarted) {
mStatus = Started;
rv = Init();
if (NS_FAILED(rv)) {
return rv;
}
// Let's set avail_out to -1 so we read something from the stream.
mZs.avail_out = (uInt)-1;
}
// Nothing more can be read
if (mStatus == Done) {
*_retval = 0;
return NS_OK;
}
// Stored file:
if (!mData.compressed) {
rv = mData.inputStream->Read(aBuffer,
(mData.sizeToBeRead > aCount ?
aCount : mData.sizeToBeRead),
_retval);
if (NS_SUCCEEDED(rv)) {
mData.sizeToBeRead -= *_retval;
mData.cursor += *_retval;
if (mData.sizeToBeRead == 0) {
mStatus = Done;
}
}
return rv;
}
// We have nothing ready to be processed:
if (mZs.avail_out != 0 && mData.sizeToBeRead != 0) {
uint32_t ret;
rv = mData.inputStream->Read((char*)mData.input,
(mData.sizeToBeRead > sizeof(mData.input) ?
sizeof(mData.input) : mData.sizeToBeRead),
&ret);
if (NS_FAILED(rv)) {
return rv;
}
// Terminator:
if (ret == 0) {
*_retval = 0;
return NS_OK;
}
mData.sizeToBeRead -= ret;
mZs.avail_in = ret;
mZs.next_in = mData.input;
}
mZs.avail_out = aCount;
mZs.next_out = (unsigned char*)aBuffer;
int ret = inflate(&mZs, mData.sizeToBeRead ? Z_NO_FLUSH : Z_FINISH);
if (ret != Z_BUF_ERROR && ret != Z_OK && ret != Z_STREAM_END) {
return NS_ERROR_UNEXPECTED;
}
if (ret == Z_STREAM_END) {
mStatus = Done;
}
*_retval = aCount - mZs.avail_out;
mData.cursor += *_retval;
return NS_OK;
}
NS_IMETHODIMP
ArchiveInputStream::ReadSegments(nsWriteSegmentFun aWriter,
void* aClosure,
uint32_t aCount,
uint32_t* _retval)
{
// don't have a buffer to read from, so this better not be called!
NS_NOTREACHED("Consumers should be using Read()!");
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
ArchiveInputStream::IsNonBlocking(bool* _retval)
{
// We are blocking
*_retval = false;
return NS_OK;
}
NS_IMETHODIMP
ArchiveInputStream::Seek(int32_t aWhence, int64_t aOffset)
{
int64_t pos = aOffset;
switch (aWhence) {
case NS_SEEK_SET:
break;
case NS_SEEK_CUR:
pos += mData.cursor;
break;
case NS_SEEK_END:
pos += mLength;
break;
default:
NS_NOTREACHED("unexpected whence value");
return NS_ERROR_UNEXPECTED;
}
if (pos == int64_t(mData.cursor)) {
return NS_OK;
}
if (pos < 0 || pos >= mLength) {
return NS_ERROR_FAILURE;
}
// We have to terminate the previous operation:
nsresult rv;
if (mStatus != NotStarted) {
rv = Close();
NS_ENSURE_SUCCESS(rv, rv);
}
// Reset the cursor:
mData.cursor = 0;
// Note: This code is heavy but inflate does not have any seek() support:
uint32_t ret;
char buffer[1024];
while (pos > 0) {
rv = Read(buffer, pos > int64_t(sizeof(buffer)) ? sizeof(buffer) : pos, &ret);
if (NS_FAILED(rv)) {
return rv;
}
if (ret == 0) {
return NS_ERROR_UNEXPECTED;
}
pos -= ret;
}
return NS_OK;
}
NS_IMETHODIMP
ArchiveInputStream::Tell(int64_t *aResult)
{
*aResult = mData.cursor;
return NS_OK;
}
NS_IMETHODIMP
ArchiveInputStream::SetEOF()
{
return NS_ERROR_NOT_IMPLEMENTED;
}
// ArchiveZipFileImpl
nsresult
ArchiveZipFileImpl::GetInternalStream(nsIInputStream** aStream)
{
if (mLength > INT32_MAX) {
return NS_ERROR_FAILURE;
}
ErrorResult rv;
uint64_t size = mFileImpl->GetSize(rv);
if (NS_WARN_IF(rv.Failed())) {
return rv.ErrorCode();
}
nsCOMPtr<nsIInputStream> inputStream;
rv = mFileImpl->GetInternalStream(getter_AddRefs(inputStream));
if (NS_WARN_IF(rv.Failed()) || !inputStream) {
return NS_ERROR_UNEXPECTED;
}
nsRefPtr<ArchiveInputStream> stream = new ArchiveInputStream(size,
inputStream,
mFilename,
mStart,
mLength,
mCentral);
stream.forget(aStream);
return NS_OK;
}
already_AddRefed<mozilla::dom::FileImpl>
ArchiveZipFileImpl::CreateSlice(uint64_t aStart,
uint64_t aLength,
const nsAString& aContentType,
mozilla::ErrorResult& aRv)
{
nsRefPtr<FileImpl> impl =
new ArchiveZipFileImpl(mFilename, mContentType, aStart, mLength, mCentral,
mFileImpl);
return impl.forget();
}
NS_IMPL_ISUPPORTS_INHERITED0(ArchiveZipFileImpl, FileImpl)