mirror of
https://github.com/mozilla/gecko-dev.git
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247 lines
7.7 KiB
C++
247 lines
7.7 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* nsJARInputStream.cpp
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Netscape Communicator source code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1999
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Mitch Stoltz <mstoltz@netscape.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsJARInputStream.h"
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#include "zipstruct.h" // defines ZIP compression codes
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#include "nsZipArchive.h"
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/*---------------------------------------------
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* nsISupports implementation
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*--------------------------------------------*/
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NS_IMPL_THREADSAFE_ISUPPORTS1(nsJARInputStream, nsIInputStream)
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/*----------------------------------------------------------
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* nsJARInputStream implementation
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*--------------------------------------------------------*/
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nsresult
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nsJARInputStream::Init(nsJAR* aJAR, nsZipItem *item, PRFileDesc *fd)
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{
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nsresult rv;
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NS_ENSURE_ARG_POINTER(aJAR);
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NS_ENSURE_ARG_POINTER(item);
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NS_ENSURE_ARG_POINTER(fd);
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// Mark it as closed, in case something fails in initialisation
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mClosed = PR_TRUE;
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// Keep the file handle
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mFd = fd;
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// Keep the important bits of nsZipItem only
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mInSize = item->size;
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//-- prepare for the compression type
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switch (item->compression) {
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case STORED:
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break;
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case DEFLATED:
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mInflate = (InflateStruct *) PR_Malloc(sizeof(InflateStruct));
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NS_ENSURE_TRUE(mInflate, NS_ERROR_OUT_OF_MEMORY);
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rv = gZlibInit(&(mInflate->mZs));
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NS_ENSURE_SUCCESS(rv, NS_ERROR_OUT_OF_MEMORY);
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mInflate->mOutSize = item->realsize;
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mInflate->mInCrc = item->crc32;
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mInflate->mOutCrc = crc32(0L, Z_NULL, 0);
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break;
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default:
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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//-- Set filepointer to start of item
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rv = aJAR->mZip.SeekToItem(item, mFd);
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NS_ENSURE_SUCCESS(rv, NS_ERROR_FILE_CORRUPTED);
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// Open for reading
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mClosed = PR_FALSE;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsJARInputStream::Available(PRUint32 *_retval)
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{
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if (mClosed)
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return NS_BASE_STREAM_CLOSED;
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if (mInflate)
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*_retval = mInflate->mOutSize - mInflate->mZs.total_out;
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else
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*_retval = mInSize - mCurPos;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsJARInputStream::Read(char* aBuffer, PRUint32 aCount, PRUint32 *aBytesRead)
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{
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NS_ENSURE_ARG_POINTER(aBuffer);
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NS_ENSURE_ARG_POINTER(aBytesRead);
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*aBytesRead = 0;
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nsresult rv = NS_OK;
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if (mClosed)
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return rv;
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if (mInflate) {
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rv = ContinueInflate(aBuffer, aCount, aBytesRead);
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} else {
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PRInt32 bytesRead = 0;
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if (aCount > mInSize - mCurPos)
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aCount = mInSize - mCurPos;
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if (aCount) {
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bytesRead = PR_Read(mFd, aBuffer, aCount);
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if (bytesRead < 0)
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return NS_ERROR_FILE_CORRUPTED;
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mCurPos += bytesRead;
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}
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*aBytesRead = bytesRead;
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}
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// be aggressive about closing!
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// note that sometimes, we will close mFd before we've finished
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// deflating - this is because zlib buffers the input
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// So, don't free the ReadBuf/InflateStruct yet.
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if (mCurPos >= mInSize && mFd) {
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PR_Close(mFd);
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mFd = nsnull;
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}
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return rv;
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}
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NS_IMETHODIMP
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nsJARInputStream::ReadSegments(nsWriteSegmentFun writer, void * closure, PRUint32 count, PRUint32 *_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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nsJARInputStream::IsNonBlocking(PRBool *aNonBlocking)
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{
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*aNonBlocking = PR_FALSE;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsJARInputStream::Close()
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{
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PR_FREEIF(mInflate);
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if (mFd) {
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PR_Close(mFd);
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mFd = nsnull;
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}
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mClosed = PR_TRUE;
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return NS_OK;
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}
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nsresult
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nsJARInputStream::ContinueInflate(char* aBuffer, PRUint32 aCount,
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PRUint32* aBytesRead)
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{
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// No need to check the args, ::Read did that, but assert them at least
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NS_ASSERTION(mInflate,"inflate data structure missing");
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NS_ASSERTION(aBuffer,"aBuffer parameter must not be null");
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NS_ASSERTION(aBytesRead,"aBytesRead parameter must not be null");
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// Keep old total_out count
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const PRUint32 oldTotalOut = mInflate->mZs.total_out;
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// make sure we aren't reading too much
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mInflate->mZs.avail_out = (mInflate->mOutSize-oldTotalOut > aCount) ? aCount : mInflate->mOutSize-oldTotalOut;
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mInflate->mZs.next_out = (unsigned char*)aBuffer;
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int zerr = Z_OK;
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//-- inflate loop
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while (mInflate->mZs.avail_out > 0 && zerr == Z_OK) {
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if (mInflate->mZs.avail_in == 0 && mCurPos < mInSize) {
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// time to fill the buffer!
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PRUint32 bytesToRead = (mInSize-mCurPos < ZIP_BUFLEN) ? mInSize-mCurPos : ZIP_BUFLEN;
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NS_ASSERTION(mFd, "File handle missing");
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PRInt32 bytesRead = PR_Read(mFd, mInflate->mReadBuf, bytesToRead);
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if (bytesRead < 0) {
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zerr = Z_ERRNO;
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break;
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}
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mCurPos += bytesRead;
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// now set the state for 'inflate'
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mInflate->mZs.next_in = mInflate->mReadBuf;
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mInflate->mZs.avail_in = bytesRead;
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}
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// now inflate
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zerr = inflate(&(mInflate->mZs), Z_SYNC_FLUSH);
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}
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if ((zerr != Z_OK) && (zerr != Z_STREAM_END))
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return NS_ERROR_FILE_CORRUPTED;
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*aBytesRead = (mInflate->mZs.total_out - oldTotalOut);
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// Calculate the CRC on the output
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mInflate->mOutCrc = crc32(mInflate->mOutCrc, (unsigned char*)aBuffer, *aBytesRead);
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// be aggressive about ending the inflation
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// for some reason we don't always get Z_STREAM_END
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if (zerr == Z_STREAM_END || mInflate->mZs.total_out == mInflate->mOutSize) {
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inflateEnd(&(mInflate->mZs));
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// stop returning valid data as soon as we know we have a bad CRC
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if (mInflate->mOutCrc != mInflate->mInCrc) {
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// asserting because while this rarely happens, you definitely
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// want to catch it in debug builds!
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NS_NOTREACHED(0);
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return NS_ERROR_FILE_CORRUPTED;
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}
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}
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return NS_OK;
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}
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