mirror of
https://github.com/mozilla/gecko-dev.git
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401 lines
9.2 KiB
C++
401 lines
9.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "ArchiveZipFile.h"
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#include "ArchiveZipEvent.h"
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#include "nsIInputStream.h"
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#include "zlib.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/dom/File.h"
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using namespace mozilla::dom;
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USING_ARCHIVEREADER_NAMESPACE
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#define ZIP_CHUNK 16384
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/**
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* Input stream object for zip files
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*/
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class ArchiveInputStream MOZ_FINAL : public nsIInputStream,
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public nsISeekableStream
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{
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public:
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ArchiveInputStream(uint64_t aParentSize,
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nsIInputStream* aInputStream,
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nsString& aFilename,
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uint32_t aStart,
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uint32_t aLength,
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ZipCentral& aCentral)
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: mCentral(aCentral),
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mFilename(aFilename),
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mStart(aStart),
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mLength(aLength),
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mStatus(NotStarted)
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{
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MOZ_COUNT_CTOR(ArchiveInputStream);
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// Reset the data:
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memset(&mData, 0, sizeof(mData));
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mData.parentSize = aParentSize;
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mData.inputStream = aInputStream;
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}
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSIINPUTSTREAM
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NS_DECL_NSISEEKABLESTREAM
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private:
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virtual ~ArchiveInputStream()
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{
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MOZ_COUNT_DTOR(ArchiveInputStream);
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Close();
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}
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nsresult Init();
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private: // data
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ZipCentral mCentral;
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nsString mFilename;
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uint32_t mStart;
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uint32_t mLength;
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z_stream mZs;
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enum {
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NotStarted,
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Started,
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Done
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} mStatus;
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struct {
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uint64_t parentSize;
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nsCOMPtr<nsIInputStream> inputStream;
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unsigned char input[ZIP_CHUNK];
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uint32_t sizeToBeRead;
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uint32_t cursor;
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bool compressed; // a zip file can contain stored or compressed files
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} mData;
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};
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NS_IMPL_ISUPPORTS(ArchiveInputStream,
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nsIInputStream,
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nsISeekableStream)
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nsresult
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ArchiveInputStream::Init()
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{
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nsresult rv;
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memset(&mZs, 0, sizeof(z_stream));
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int zerr = inflateInit2(&mZs, -MAX_WBITS);
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if (zerr != Z_OK) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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mData.sizeToBeRead = ArchiveZipItem::StrToInt32(mCentral.size);
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uint32_t offset = ArchiveZipItem::StrToInt32(mCentral.localhdr_offset);
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// The file is corrupt
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if (offset + ZIPLOCAL_SIZE > mData.parentSize) {
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return NS_ERROR_UNEXPECTED;
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}
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// From the input stream to a seekable stream
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nsCOMPtr<nsISeekableStream> seekableStream;
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seekableStream = do_QueryInterface(mData.inputStream);
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if (!seekableStream) {
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return NS_ERROR_UNEXPECTED;
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}
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// Seek + read the ZipLocal struct
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seekableStream->Seek(nsISeekableStream::NS_SEEK_SET, offset);
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uint8_t buffer[ZIPLOCAL_SIZE];
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uint32_t ret;
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rv = mData.inputStream->Read((char*)buffer, ZIPLOCAL_SIZE, &ret);
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if (NS_FAILED(rv) || ret != ZIPLOCAL_SIZE) {
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return NS_ERROR_UNEXPECTED;
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}
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// Signature check:
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if (ArchiveZipItem::StrToInt32(buffer) != LOCALSIG) {
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return NS_ERROR_UNEXPECTED;
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}
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ZipLocal local;
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memcpy(&local, buffer, ZIPLOCAL_SIZE);
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// Seek to the real data:
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offset += ZIPLOCAL_SIZE +
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ArchiveZipItem::StrToInt16(local.filename_len) +
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ArchiveZipItem::StrToInt16(local.extrafield_len);
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// The file is corrupt if there is not enough data
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if (offset + mData.sizeToBeRead > mData.parentSize) {
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return NS_ERROR_UNEXPECTED;
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}
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// Data starts here:
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seekableStream->Seek(nsISeekableStream::NS_SEEK_SET, offset);
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// The file is compressed or not?
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mData.compressed = (ArchiveZipItem::StrToInt16(mCentral.method) != 0);
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// We have to skip the first mStart bytes:
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if (mStart != 0) {
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rv = Seek(NS_SEEK_SET, mStart);
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NS_ENSURE_SUCCESS(rv, rv);
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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ArchiveInputStream::Close()
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{
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if (mStatus != NotStarted) {
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inflateEnd(&mZs);
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mStatus = NotStarted;
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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ArchiveInputStream::Available(uint64_t* _retval)
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{
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*_retval = mLength - mData.cursor - mStart;
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return NS_OK;
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}
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NS_IMETHODIMP
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ArchiveInputStream::Read(char* aBuffer,
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uint32_t aCount,
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uint32_t* _retval)
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{
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NS_ENSURE_ARG_POINTER(aBuffer);
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NS_ENSURE_ARG_POINTER(_retval);
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nsresult rv;
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// This is the first time:
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if (mStatus == NotStarted) {
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mStatus = Started;
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rv = Init();
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if (NS_FAILED(rv)) {
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return rv;
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}
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// Let's set avail_out to -1 so we read something from the stream.
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mZs.avail_out = (uInt)-1;
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}
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// Nothing more can be read
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if (mStatus == Done) {
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*_retval = 0;
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return NS_OK;
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}
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// Stored file:
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if (!mData.compressed) {
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rv = mData.inputStream->Read(aBuffer,
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(mData.sizeToBeRead > aCount ?
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aCount : mData.sizeToBeRead),
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_retval);
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if (NS_SUCCEEDED(rv)) {
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mData.sizeToBeRead -= *_retval;
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mData.cursor += *_retval;
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if (mData.sizeToBeRead == 0) {
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mStatus = Done;
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}
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}
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return rv;
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}
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// We have nothing ready to be processed:
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if (mZs.avail_out != 0 && mData.sizeToBeRead != 0) {
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uint32_t ret;
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rv = mData.inputStream->Read((char*)mData.input,
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(mData.sizeToBeRead > sizeof(mData.input) ?
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sizeof(mData.input) : mData.sizeToBeRead),
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&ret);
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if (NS_FAILED(rv)) {
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return rv;
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}
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// Terminator:
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if (ret == 0) {
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*_retval = 0;
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return NS_OK;
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}
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mData.sizeToBeRead -= ret;
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mZs.avail_in = ret;
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mZs.next_in = mData.input;
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}
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mZs.avail_out = aCount;
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mZs.next_out = (unsigned char*)aBuffer;
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int ret = inflate(&mZs, mData.sizeToBeRead ? Z_NO_FLUSH : Z_FINISH);
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if (ret != Z_BUF_ERROR && ret != Z_OK && ret != Z_STREAM_END) {
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return NS_ERROR_UNEXPECTED;
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}
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if (ret == Z_STREAM_END) {
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mStatus = Done;
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}
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*_retval = aCount - mZs.avail_out;
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mData.cursor += *_retval;
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return NS_OK;
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}
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NS_IMETHODIMP
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ArchiveInputStream::ReadSegments(nsWriteSegmentFun aWriter,
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void* aClosure,
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uint32_t aCount,
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uint32_t* _retval)
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{
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// don't have a buffer to read from, so this better not be called!
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NS_NOTREACHED("Consumers should be using Read()!");
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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NS_IMETHODIMP
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ArchiveInputStream::IsNonBlocking(bool* _retval)
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{
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// We are blocking
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*_retval = false;
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return NS_OK;
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}
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NS_IMETHODIMP
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ArchiveInputStream::Seek(int32_t aWhence, int64_t aOffset)
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{
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int64_t pos = aOffset;
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switch (aWhence) {
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case NS_SEEK_SET:
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break;
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case NS_SEEK_CUR:
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pos += mData.cursor;
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break;
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case NS_SEEK_END:
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pos += mLength;
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break;
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default:
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NS_NOTREACHED("unexpected whence value");
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return NS_ERROR_UNEXPECTED;
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}
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if (pos == int64_t(mData.cursor)) {
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return NS_OK;
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}
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if (pos < 0 || pos >= mLength) {
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return NS_ERROR_FAILURE;
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}
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// We have to terminate the previous operation:
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nsresult rv;
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if (mStatus != NotStarted) {
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rv = Close();
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NS_ENSURE_SUCCESS(rv, rv);
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}
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// Reset the cursor:
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mData.cursor = 0;
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// Note: This code is heavy but inflate does not have any seek() support:
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uint32_t ret;
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char buffer[1024];
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while (pos > 0) {
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rv = Read(buffer, pos > int64_t(sizeof(buffer)) ? sizeof(buffer) : pos, &ret);
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if (NS_FAILED(rv)) {
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return rv;
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}
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if (ret == 0) {
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return NS_ERROR_UNEXPECTED;
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}
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pos -= ret;
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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ArchiveInputStream::Tell(int64_t *aResult)
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{
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*aResult = mData.cursor;
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return NS_OK;
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}
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NS_IMETHODIMP
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ArchiveInputStream::SetEOF()
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{
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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// ArchiveZipFileImpl
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nsresult
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ArchiveZipFileImpl::GetInternalStream(nsIInputStream** aStream)
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{
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if (mLength > INT32_MAX) {
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return NS_ERROR_FAILURE;
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}
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ErrorResult rv;
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uint64_t size = mFileImpl->GetSize(rv);
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if (NS_WARN_IF(rv.Failed())) {
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return rv.ErrorCode();
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}
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nsCOMPtr<nsIInputStream> inputStream;
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rv = mFileImpl->GetInternalStream(getter_AddRefs(inputStream));
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if (NS_WARN_IF(rv.Failed()) || !inputStream) {
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return NS_ERROR_UNEXPECTED;
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}
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nsRefPtr<ArchiveInputStream> stream = new ArchiveInputStream(size,
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inputStream,
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mFilename,
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mStart,
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mLength,
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mCentral);
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stream.forget(aStream);
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return NS_OK;
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}
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already_AddRefed<mozilla::dom::FileImpl>
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ArchiveZipFileImpl::CreateSlice(uint64_t aStart,
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uint64_t aLength,
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const nsAString& aContentType,
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mozilla::ErrorResult& aRv)
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{
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nsRefPtr<FileImpl> impl =
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new ArchiveZipFileImpl(mFilename, mContentType, aStart, mLength, mCentral,
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mFileImpl);
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return impl.forget();
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}
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NS_IMPL_ISUPPORTS_INHERITED0(ArchiveZipFileImpl, FileImpl)
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