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gecko-dev/modules/libjar/nsJARInputStream.cpp

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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>
* Taras Glek <tglek@mozilla.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"
#include "nsDebug.h"
/*---------------------------------------------
* nsISupports implementation
*--------------------------------------------*/
NS_IMPL_THREADSAFE_ISUPPORTS1(nsJARInputStream, nsIInputStream)
/*----------------------------------------------------------
* nsJARInputStream implementation
*--------------------------------------------------------*/
nsresult
nsJARInputStream::InitFile(nsJAR *aJar, nsZipItem *item)
{
nsresult rv = NS_OK;
NS_ABORT_IF_FALSE(aJar, "Argument may not be null");
NS_ABORT_IF_FALSE(item, "Argument may not be null");
// Mark it as closed, in case something fails in initialisation
mMode = MODE_CLOSED;
//-- prepare for the compression type
switch (item->compression) {
case STORED:
mMode = MODE_COPY;
break;
case DEFLATED:
rv = gZlibInit(&mZs);
NS_ENSURE_SUCCESS(rv, rv);
mMode = MODE_INFLATE;
mOutSize = item->realsize;
mInCrc = item->crc32;
mOutCrc = crc32(0L, Z_NULL, 0);
break;
default:
return NS_ERROR_NOT_IMPLEMENTED;
}
// Must keep handle to filepointer and mmap structure as long as we need access to the mmapped data
mFd = aJar->mZip.GetFD();
mZs.next_in = aJar->mZip.GetData(item);
mZs.avail_in = item->size;
mOutSize = item->realsize;
mZs.total_out = 0;
return NS_OK;
}
nsresult
nsJARInputStream::InitDirectory(nsJAR* aJar,
const nsACString& aJarDirSpec,
const char* aDir)
{
NS_ABORT_IF_FALSE(aJar, "Argument may not be null");
NS_ABORT_IF_FALSE(aDir, "Argument may not be null");
// Mark it as closed, in case something fails in initialisation
mMode = MODE_CLOSED;
// Keep the zipReader for getting the actual zipItems
mJar = aJar;
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 = mJar->mZip.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.AppendElement(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
mMode = MODE_DIRECTORY;
mZs.total_out = 0;
mArrPos = 0;
return NS_OK;
}
NS_IMETHODIMP
nsJARInputStream::Available(PRUint32 *_retval)
{
// A lot of callers don't check the error code.
// They just use the _retval value.
*_retval = 0;
switch (mMode) {
case MODE_NOTINITED:
break;
case MODE_CLOSED:
return NS_BASE_STREAM_CLOSED;
case MODE_DIRECTORY:
*_retval = mBuffer.Length();
break;
case MODE_INFLATE:
case MODE_COPY:
*_retval = mOutSize - mZs.total_out;
break;
}
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;
switch (mMode) {
case MODE_NOTINITED:
return NS_OK;
case MODE_CLOSED:
return NS_BASE_STREAM_CLOSED;
case MODE_DIRECTORY:
return ReadDirectory(aBuffer, aCount, aBytesRead);
case MODE_INFLATE:
if (mFd) {
rv = ContinueInflate(aBuffer, aCount, aBytesRead);
}
// be aggressive about releasing the file!
// note that sometimes, we will release mFd before we've finished
// deflating - this is because zlib buffers the input
if (mZs.avail_in == 0) {
mFd = nsnull;
}
break;
case MODE_COPY:
if (mFd) {
PRUint32 count = PR_MIN(aCount, mOutSize - mZs.total_out);
if (count) {
memcpy(aBuffer, mZs.next_in + mZs.total_out, count);
mZs.total_out += count;
}
*aBytesRead = count;
}
// be aggressive about releasing the file!
// note that sometimes, we will release mFd before we've finished copying.
if (mZs.total_out >= mOutSize) {
mFd = nsnull;
}
break;
}
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()
{
mMode = MODE_CLOSED;
mFd = nsnull;
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(aBuffer,"aBuffer parameter must not be null");
NS_ASSERTION(aBytesRead,"aBytesRead parameter must not be null");
// Keep old total_out count
const PRUint32 oldTotalOut = mZs.total_out;
// make sure we aren't reading too much
mZs.avail_out = PR_MIN(aCount, (mOutSize-oldTotalOut));
mZs.next_out = (unsigned char*)aBuffer;
// now inflate
int zerr = inflate(&mZs, Z_SYNC_FLUSH);
if ((zerr != Z_OK) && (zerr != Z_STREAM_END))
return NS_ERROR_FILE_CORRUPTED;
*aBytesRead = (mZs.total_out - oldTotalOut);
// Calculate the CRC on the output
mOutCrc = crc32(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 || mZs.total_out == mOutSize) {
inflateEnd(&mZs);
// stop returning valid data as soon as we know we have a bad CRC
if (mOutCrc != 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.Length();
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 = mJar->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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