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pjs/modules/libjar/nsJARInputStream.cpp

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14 KiB
C++
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* nsJARInputStream.cpp
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Netscape Communicator source code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Mitch Stoltz <mstoltz@netscape.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsJARInputStream.h"
#include "zipstruct.h" // defines ZIP compression codes
#include "nsZipArchive.h"
#include "nsNetUtil.h"
#include "nsEscape.h"
#include "nsIFile.h"
/*---------------------------------------------
* nsISupports implementation
*--------------------------------------------*/
NS_IMPL_THREADSAFE_ISUPPORTS1(nsJARInputStream, nsIInputStream)
/*----------------------------------------------------------
* nsJARInputStream implementation
*--------------------------------------------------------*/
nsresult
nsJARInputStream::InitFile(nsZipArchive* aZip, nsZipItem *item, PRFileDesc *fd)
{
nsresult rv;
// Keep the file handle, even on failure
mFd = fd;
NS_ENSURE_ARG_POINTER(aZip);
NS_ENSURE_ARG_POINTER(item);
NS_ENSURE_ARG_POINTER(fd);
// Mark it as closed, in case something fails in initialisation
mClosed = PR_TRUE;
// Keep the important bits of nsZipItem only
mInSize = item->size;
//-- prepare for the compression type
switch (item->compression) {
case STORED:
break;
case DEFLATED:
mInflate = (InflateStruct *) PR_Malloc(sizeof(InflateStruct));
NS_ENSURE_TRUE(mInflate, NS_ERROR_OUT_OF_MEMORY);
rv = gZlibInit(&(mInflate->mZs));
NS_ENSURE_SUCCESS(rv, NS_ERROR_OUT_OF_MEMORY);
mInflate->mOutSize = item->realsize;
mInflate->mInCrc = item->crc32;
mInflate->mOutCrc = crc32(0L, Z_NULL, 0);
break;
default:
return NS_ERROR_NOT_IMPLEMENTED;
}
//-- Set filepointer to start of item
rv = aZip->SeekToItem(item, mFd);
NS_ENSURE_SUCCESS(rv, NS_ERROR_FILE_CORRUPTED);
// Open for reading
mClosed = PR_FALSE;
mCurPos = 0;
return NS_OK;
}
nsresult
nsJARInputStream::InitDirectory(nsZipArchive* aZip,
const nsACString& aJarDirSpec,
const char* aDir)
{
NS_ENSURE_ARG_POINTER(aZip);
NS_ENSURE_ARG_POINTER(aDir);
// Mark it as closed, in case something fails in initialisation
mClosed = PR_TRUE;
mDirectory = PR_TRUE;
// Keep the zipReader for getting the actual zipItems
mZip = aZip;
nsZipFind *find;
nsresult rv;
// We can get aDir's contents as strings via FindEntries
// with the following pattern (see nsIZipReader.findEntries docs)
// assuming dirName is properly escaped:
//
// dirName + "?*~" + dirName + "?*/?*"
nsDependentCString dirName(aDir);
mNameLen = dirName.Length();
// iterate through dirName and copy it to escDirName, escaping chars
// which are special at the "top" level of the regexp so FindEntries
// works correctly
nsCAutoString escDirName;
const char* curr = dirName.BeginReading();
const char* end = dirName.EndReading();
while (curr != end) {
switch (*curr) {
case '*':
case '?':
case '$':
case '[':
case ']':
case '^':
case '~':
case '(':
case ')':
case '\\':
escDirName.Append('\\');
// fall through
default:
escDirName.Append(*curr);
}
++curr;
}
nsCAutoString pattern = escDirName + NS_LITERAL_CSTRING("?*~") +
escDirName + NS_LITERAL_CSTRING("?*/?*");
rv = aZip->FindInit(pattern.get(), &find);
if (NS_FAILED(rv)) return rv;
const char *name;
while ((rv = find->FindNext( &name )) == NS_OK) {
// No need to copy string, just share the one from nsZipArchive
mArray.AppendCString(nsDependentCString(name));
}
delete find;
if (rv != NS_ERROR_FILE_TARGET_DOES_NOT_EXIST && NS_FAILED(rv)) {
return NS_ERROR_FAILURE; // no error translation
}
// Sort it
mArray.Sort();
mBuffer.AssignLiteral("300: ");
mBuffer.Append(aJarDirSpec);
mBuffer.AppendLiteral("\n200: filename content-length last-modified file-type\n");
// Open for reading
mClosed = PR_FALSE;
mCurPos = 0;
mArrPos = 0;
return NS_OK;
}
NS_IMETHODIMP
nsJARInputStream::Available(PRUint32 *_retval)
{
if (mClosed)
return NS_BASE_STREAM_CLOSED;
if (mDirectory)
*_retval = mBuffer.Length();
else if (mInflate)
*_retval = mInflate->mOutSize - mInflate->mZs.total_out;
else
*_retval = mInSize - mCurPos;
return NS_OK;
}
NS_IMETHODIMP
nsJARInputStream::Read(char* aBuffer, PRUint32 aCount, PRUint32 *aBytesRead)
{
NS_ENSURE_ARG_POINTER(aBuffer);
NS_ENSURE_ARG_POINTER(aBytesRead);
*aBytesRead = 0;
nsresult rv = NS_OK;
if (mClosed)
return rv;
if (mDirectory) {
rv = ReadDirectory(aBuffer, aCount, aBytesRead);
} else {
if (mInflate) {
rv = ContinueInflate(aBuffer, aCount, aBytesRead);
} else {
PRInt32 bytesRead = 0;
aCount = PR_MIN(aCount, mInSize - mCurPos);
if (aCount) {
bytesRead = PR_Read(mFd, aBuffer, aCount);
if (bytesRead < 0)
return NS_ERROR_FILE_CORRUPTED;
mCurPos += bytesRead;
if (bytesRead != aCount) {
// file is truncated or was lying about size, we're done
PR_Close(mFd);
mFd = nsnull;
return NS_ERROR_FILE_CORRUPTED;
}
}
*aBytesRead = bytesRead;
}
// be aggressive about closing!
// note that sometimes, we will close mFd before we've finished
// deflating - this is because zlib buffers the input
// So, don't free the ReadBuf/InflateStruct yet.
if (mCurPos >= mInSize && mFd) {
PR_Close(mFd);
mFd = nsnull;
}
}
return rv;
}
NS_IMETHODIMP
nsJARInputStream::ReadSegments(nsWriteSegmentFun writer, void * closure, PRUint32 count, PRUint32 *_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
nsJARInputStream::IsNonBlocking(PRBool *aNonBlocking)
{
*aNonBlocking = PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP
nsJARInputStream::Close()
{
PR_FREEIF(mInflate);
if (mFd) {
PR_Close(mFd);
mFd = nsnull;
}
mClosed = PR_TRUE;
return NS_OK;
}
nsresult
nsJARInputStream::ContinueInflate(char* aBuffer, PRUint32 aCount,
PRUint32* aBytesRead)
{
// No need to check the args, ::Read did that, but assert them at least
NS_ASSERTION(mInflate,"inflate data structure missing");
NS_ASSERTION(aBuffer,"aBuffer parameter must not be null");
NS_ASSERTION(aBytesRead,"aBytesRead parameter must not be null");
// Keep old total_out count
const PRUint32 oldTotalOut = mInflate->mZs.total_out;
// make sure we aren't reading too much
mInflate->mZs.avail_out = (mInflate->mOutSize-oldTotalOut > aCount) ? aCount : mInflate->mOutSize-oldTotalOut;
mInflate->mZs.next_out = (unsigned char*)aBuffer;
int zerr = Z_OK;
//-- inflate loop
while (mInflate->mZs.avail_out > 0 && zerr == Z_OK) {
if (mInflate->mZs.avail_in == 0 && mCurPos < mInSize) {
// time to fill the buffer!
PRUint32 bytesToRead = PR_MIN(mInSize - mCurPos, ZIP_BUFLEN);
NS_ASSERTION(mFd, "File handle missing");
PRInt32 bytesRead = PR_Read(mFd, mInflate->mReadBuf, bytesToRead);
if (bytesRead < 0) {
zerr = Z_ERRNO;
break;
}
mCurPos += bytesRead;
// now set the state for 'inflate'
mInflate->mZs.next_in = mInflate->mReadBuf;
mInflate->mZs.avail_in = bytesRead;
}
// now inflate
zerr = inflate(&(mInflate->mZs), Z_SYNC_FLUSH);
}
if ((zerr != Z_OK) && (zerr != Z_STREAM_END))
return NS_ERROR_FILE_CORRUPTED;
*aBytesRead = (mInflate->mZs.total_out - oldTotalOut);
// Calculate the CRC on the output
mInflate->mOutCrc = crc32(mInflate->mOutCrc, (unsigned char*)aBuffer, *aBytesRead);
// be aggressive about ending the inflation
// for some reason we don't always get Z_STREAM_END
if (zerr == Z_STREAM_END || mInflate->mZs.total_out == mInflate->mOutSize) {
inflateEnd(&(mInflate->mZs));
// stop returning valid data as soon as we know we have a bad CRC
if (mInflate->mOutCrc != mInflate->mInCrc) {
// asserting because while this rarely happens, you definitely
// want to catch it in debug builds!
NS_NOTREACHED(0);
return NS_ERROR_FILE_CORRUPTED;
}
}
return NS_OK;
}
nsresult
nsJARInputStream::ReadDirectory(char* aBuffer, PRUint32 aCount, PRUint32 *aBytesRead)
{
// No need to check the args, ::Read did that, but assert them at least
NS_ASSERTION(aBuffer,"aBuffer parameter must not be null");
NS_ASSERTION(aBytesRead,"aBytesRead parameter must not be null");
// If the buffer contains data, copy what's there up to the desired amount
PRUint32 numRead = CopyDataToBuffer(aBuffer, aCount);
if (aCount > 0) {
// empty the buffer and start writing directory entry lines to it
mBuffer.Truncate();
mCurPos = 0;
const PRUint32 arrayLen = mArray.Count();
for ( ;aCount > mBuffer.Length(); mArrPos++) {
// have we consumed all the directory contents?
if (arrayLen <= mArrPos)
break;
const char * entryName = mArray[mArrPos]->get();
PRUint32 entryNameLen = mArray[mArrPos]->Length();
nsZipItem* ze = mZip->GetItem(entryName);
NS_ENSURE_TRUE(ze, NS_ERROR_FILE_TARGET_DOES_NOT_EXIST);
// Last Modified Time
PRExplodedTime tm;
PR_ExplodeTime(GetModTime(ze->date, ze->time), PR_GMTParameters, &tm);
char itemLastModTime[65];
PR_FormatTimeUSEnglish(itemLastModTime,
sizeof(itemLastModTime),
" %a,%%20%d%%20%b%%20%Y%%20%H:%M:%S%%20GMT ",
&tm);
// write a 201: line to the buffer for this item
// 200: filename content-length last-modified file-type
mBuffer.AppendLiteral("201: ");
// Names must be escaped and relative, so use the pre-calculated length
// of the directory name as the offset into the string
// NS_EscapeURL adds the escaped URL to the give string buffer
NS_EscapeURL(entryName + mNameLen,
entryNameLen - mNameLen,
esc_Minimal | esc_AlwaysCopy,
mBuffer);
mBuffer.Append(' ');
mBuffer.AppendInt(ze->realsize, 10);
mBuffer.Append(itemLastModTime); // starts/ends with ' '
if (ze->isDirectory)
mBuffer.AppendLiteral("DIRECTORY\n");
else
mBuffer.AppendLiteral("FILE\n");
}
// Copy up to the desired amount of data to buffer
numRead += CopyDataToBuffer(aBuffer, aCount);
}
*aBytesRead = numRead;
return NS_OK;
}
PRUint32
nsJARInputStream::CopyDataToBuffer(char* &aBuffer, PRUint32 &aCount)
{
const PRUint32 writeLength = PR_MIN(aCount, mBuffer.Length() - mCurPos);
if (writeLength > 0) {
memcpy(aBuffer, mBuffer.get() + mCurPos, writeLength);
mCurPos += writeLength;
aCount -= writeLength;
aBuffer += writeLength;
}
// return number of bytes copied to the buffer so the
// Read method can return the number of bytes copied
return writeLength;
}
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