The Tor Browser: netwerk/streamconv/converters/nsDirIndexParser.cpp@a63d609f5ebe (annotated)

netwerk/streamconv/converters/nsDirIndexParser.cpp@a63d609f5ebe (annotated)

netwerk/streamconv/converters/nsDirIndexParser.cpp

Thu, 15 Jan 2015 15:55:04 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 15 Jan 2015 15:55:04 +0100
branch: TOR_BUG_9701
changeset 9: a63d609f5ebe
permissions: -rw-r--r--

Back out 97036ab72558 which inappropriately compared turds to third parties.

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* 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/. */
 /* This parsing code originally lived in xpfe/components/directory/ - bbaetz */
 #include "mozilla/ArrayUtils.h"
 #include "prprf.h"
 #include "nsDirIndexParser.h"
 #include "nsEscape.h"
 #include "nsIInputStream.h"
 #include "nsCRT.h"
 #include "mozilla/dom/FallbackEncoding.h"
 #include "nsITextToSubURI.h"
 #include "nsIDirIndex.h"
 #include "nsServiceManagerUtils.h"
 using namespace mozilla;
 NS_IMPL_ISUPPORTS(nsDirIndexParser,
                   nsIRequestObserver,
                   nsIStreamListener,
                   nsIDirIndexParser)
 nsDirIndexParser::nsDirIndexParser() {
 }
 nsresult
 nsDirIndexParser::Init() {
   mLineStart = 0;
   mHasDescription = false;
   mFormat = nullptr;
   mozilla::dom::FallbackEncoding::FromLocale(mEncoding);
   nsresult rv;
   // XXX not threadsafe
   if (gRefCntParser++ == 0)
     rv = CallGetService(NS_ITEXTTOSUBURI_CONTRACTID, &gTextToSubURI);
   else
     rv = NS_OK;
   return rv;
 }
 nsDirIndexParser::~nsDirIndexParser() {
   delete[] mFormat;
   // XXX not threadsafe
   if (--gRefCntParser == 0) {
     NS_IF_RELEASE(gTextToSubURI);
   }
 }
 NS_IMETHODIMP
 nsDirIndexParser::SetListener(nsIDirIndexListener* aListener) {
   mListener = aListener;
   return NS_OK;
 }
 NS_IMETHODIMP
 nsDirIndexParser::GetListener(nsIDirIndexListener** aListener) {
   NS_IF_ADDREF(*aListener = mListener.get());
   return NS_OK;
 }
 NS_IMETHODIMP
 nsDirIndexParser::GetComment(char** aComment) {
   *aComment = ToNewCString(mComment);
   if (!*aComment)
     return NS_ERROR_OUT_OF_MEMORY;
   return NS_OK;
 }
 NS_IMETHODIMP
 nsDirIndexParser::SetEncoding(const char* aEncoding) {
   mEncoding.Assign(aEncoding);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsDirIndexParser::GetEncoding(char** aEncoding) {
   *aEncoding = ToNewCString(mEncoding);
   if (!*aEncoding)
     return NS_ERROR_OUT_OF_MEMORY;
   return NS_OK;
 }
 NS_IMETHODIMP
 nsDirIndexParser::OnStartRequest(nsIRequest* aRequest, nsISupports* aCtxt) {
   return NS_OK;
 }
 NS_IMETHODIMP
 nsDirIndexParser::OnStopRequest(nsIRequest *aRequest, nsISupports *aCtxt,
                                 nsresult aStatusCode) {
   // Finish up
   if (mBuf.Length() > (uint32_t) mLineStart) {
     ProcessData(aRequest, aCtxt);
   }
   return NS_OK;
 }
 nsDirIndexParser::Field
 nsDirIndexParser::gFieldTable[] = {
   { "Filename", FIELD_FILENAME },
   { "Description", FIELD_DESCRIPTION },
   { "Content-Length", FIELD_CONTENTLENGTH },
   { "Last-Modified", FIELD_LASTMODIFIED },
   { "Content-Type", FIELD_CONTENTTYPE },
   { "File-Type", FIELD_FILETYPE },
   { nullptr, FIELD_UNKNOWN }
 };
 nsrefcnt nsDirIndexParser::gRefCntParser = 0;
 nsITextToSubURI *nsDirIndexParser::gTextToSubURI;
 nsresult
 nsDirIndexParser::ParseFormat(const char* aFormatStr) {
   // Parse a "200" format line, and remember the fields and their
   // ordering in mFormat. Multiple 200 lines stomp on each other.
   // Lets find out how many elements we have.
   // easier to do this then realloc
   const char* pos = aFormatStr;
   unsigned int num = 0;
   do {
     while (*pos && nsCRT::IsAsciiSpace(char16_t(*pos)))
       ++pos;
     ++num;
     // There are a maximum of six allowed header fields (doubled plus
     // terminator, just in case) -- Bug 443299
     if (num > (2 * ArrayLength(gFieldTable)))
       return NS_ERROR_UNEXPECTED;
     if (! *pos)
       break;
     while (*pos && !nsCRT::IsAsciiSpace(char16_t(*pos)))
       ++pos;
   } while (*pos);
   delete[] mFormat;
   mFormat = new int[num+1];
   // Prevent nullptr Deref - Bug 443299
   if (mFormat == nullptr)
     return NS_ERROR_OUT_OF_MEMORY;
   mFormat[num] = -1;
   int formatNum=0;
   do {
     while (*aFormatStr && nsCRT::IsAsciiSpace(char16_t(*aFormatStr)))
       ++aFormatStr;
     if (! *aFormatStr)
       break;
     nsAutoCString name;
     int32_t     len = 0;
     while (aFormatStr[len] && !nsCRT::IsAsciiSpace(char16_t(aFormatStr[len])))
       ++len;
     name.SetCapacity(len + 1);
     name.Append(aFormatStr, len);
     aFormatStr += len;
     // Okay, we're gonna monkey with the nsStr. Bold!
     name.SetLength(nsUnescapeCount(name.BeginWriting()));
     // All tokens are case-insensitive - http://www.mozilla.org/projects/netlib/dirindexformat.html
     if (name.LowerCaseEqualsLiteral("description"))
       mHasDescription = true;
     for (Field* i = gFieldTable; i->mName; ++i) {
       if (name.EqualsIgnoreCase(i->mName)) {
         mFormat[formatNum] = i->mType;
         ++formatNum;
         break;
       }
     }
   } while (*aFormatStr);
   return NS_OK;
 }
 nsresult
 nsDirIndexParser::ParseData(nsIDirIndex *aIdx, char* aDataStr) {
   // Parse a "201" data line, using the field ordering specified in
   // mFormat.
   if (!mFormat) {
     // Ignore if we haven't seen a format yet.
     return NS_OK;
   }
   nsresult rv = NS_OK;
   nsAutoCString filename;
   for (int32_t i = 0; mFormat[i] != -1; ++i) {
     // If we've exhausted the data before we run out of fields, just
     // bail.
     if (! *aDataStr)
       break;
     while (*aDataStr && nsCRT::IsAsciiSpace(*aDataStr))
       ++aDataStr;
     char    *value = aDataStr;
     if (*aDataStr == '"' || *aDataStr == '\'') {
       // it's a quoted string. snarf everything up to the next quote character
       const char quotechar = *(aDataStr++);
       ++value;
       while (*aDataStr && *aDataStr != quotechar)
         ++aDataStr;
       *aDataStr++ = '\0';
       if (! aDataStr) {
         NS_WARNING("quoted value not terminated");
       }
     } else {
       // it's unquoted. snarf until we see whitespace.
       value = aDataStr;
       while (*aDataStr && (!nsCRT::IsAsciiSpace(*aDataStr)))
         ++aDataStr;
       *aDataStr++ = '\0';
     }
     fieldType t = fieldType(mFormat[i]);
     switch (t) {
     case FIELD_FILENAME: {
       // don't unescape at this point, so that UnEscapeAndConvert() can
       filename = value;
       bool    success = false;
       nsAutoString entryuri;
       if (gTextToSubURI) {
         char16_t   *result = nullptr;
         if (NS_SUCCEEDED(rv = gTextToSubURI->UnEscapeAndConvert(mEncoding.get(), filename.get(),
                                                                 &result)) && (result)) {
           if (*result) {
             aIdx->SetLocation(filename.get());
             if (!mHasDescription)
               aIdx->SetDescription(result);
             success = true;
           }
           NS_Free(result);
         } else {
           NS_WARNING("UnEscapeAndConvert error");
         }
       }
       if (!success) {
         // if unsuccessfully at charset conversion, then
         // just fallback to unescape'ing in-place
         // XXX - this shouldn't be using UTF8, should it?
         // when can we fail to get the service, anyway? - bbaetz
         aIdx->SetLocation(filename.get());
         if (!mHasDescription) {
           aIdx->SetDescription(NS_ConvertUTF8toUTF16(value).get());
         }
       }
     }
       break;
     case FIELD_DESCRIPTION:
       nsUnescape(value);
       aIdx->SetDescription(NS_ConvertUTF8toUTF16(value).get());
       break;
     case FIELD_CONTENTLENGTH:
       {
         int64_t len;
         int32_t status = PR_sscanf(value, "%lld", &len);
         if (status == 1)
           aIdx->SetSize(len);
         else
           aIdx->SetSize(UINT64_MAX); // UINT64_MAX means unknown
       }
       break;
     case FIELD_LASTMODIFIED:
       {
         PRTime tm;
         nsUnescape(value);
         if (PR_ParseTimeString(value, false, &tm) == PR_SUCCESS) {
           aIdx->SetLastModified(tm);
         }
       }
       break;
     case FIELD_CONTENTTYPE:
       aIdx->SetContentType(value);
       break;
     case FIELD_FILETYPE:
       // unescape in-place
       nsUnescape(value);
       if (!nsCRT::strcasecmp(value, "directory")) {
         aIdx->SetType(nsIDirIndex::TYPE_DIRECTORY);
       } else if (!nsCRT::strcasecmp(value, "file")) {
         aIdx->SetType(nsIDirIndex::TYPE_FILE);
       } else if (!nsCRT::strcasecmp(value, "symbolic-link")) {
         aIdx->SetType(nsIDirIndex::TYPE_SYMLINK);
       } else {
         aIdx->SetType(nsIDirIndex::TYPE_UNKNOWN);
       }
       break;
     case FIELD_UNKNOWN:
       // ignore
       break;
     }
   }
   return NS_OK;
 }
 NS_IMETHODIMP
 nsDirIndexParser::OnDataAvailable(nsIRequest *aRequest, nsISupports *aCtxt,
                                   nsIInputStream *aStream,
                                   uint64_t aSourceOffset,
                                   uint32_t aCount) {
   if (aCount < 1)
     return NS_OK;
   int32_t len = mBuf.Length();
   // Ensure that our mBuf has capacity to hold the data we're about to
   // read.
   if (!mBuf.SetLength(len + aCount, fallible_t()))
     return NS_ERROR_OUT_OF_MEMORY;
   // Now read the data into our buffer.
   nsresult rv;
   uint32_t count;
   rv = aStream->Read(mBuf.BeginWriting() + len, aCount, &count);
   if (NS_FAILED(rv)) return rv;
   // Set the string's length according to the amount of data we've read.
   // Note: we know this to work on nsCString. This isn't guaranteed to
   //       work on other strings.
   mBuf.SetLength(len + count);
   return ProcessData(aRequest, aCtxt);
 }
 nsresult
 nsDirIndexParser::ProcessData(nsIRequest *aRequest, nsISupports *aCtxt) {
   if (!mListener)
     return NS_ERROR_FAILURE;
   int32_t     numItems = 0;
   while(true) {
     ++numItems;
     int32_t             eol = mBuf.FindCharInSet("\n\r", mLineStart);
     if (eol < 0)        break;
     mBuf.SetCharAt(char16_t('\0'), eol);
     const char  *line = mBuf.get() + mLineStart;
     int32_t lineLen = eol - mLineStart;
     mLineStart = eol + 1;
     if (lineLen >= 4) {
       nsresult  rv;
       const char        *buf = line;
       if (buf[0] == '1') {
         if (buf[1] == '0') {
           if (buf[2] == '0' && buf[3] == ':') {
             // 100. Human-readable comment line. Ignore
           } else if (buf[2] == '1' && buf[3] == ':') {
             // 101. Human-readable information line.
             mComment.Append(buf + 4);
             char    *value = ((char *)buf) + 4;
             nsUnescape(value);
             mListener->OnInformationAvailable(aRequest, aCtxt, NS_ConvertUTF8toUTF16(value));
           } else if (buf[2] == '2' && buf[3] == ':') {
             // 102. Human-readable information line, HTML.
             mComment.Append(buf + 4);
           }
         }
       } else if (buf[0] == '2') {
         if (buf[1] == '0') {
           if (buf[2] == '0' && buf[3] == ':') {
             // 200. Define field names
             rv = ParseFormat(buf + 4);
             if (NS_FAILED(rv)) {
               return rv;
             }
           } else if (buf[2] == '1' && buf[3] == ':') {
             // 201. Field data
             nsCOMPtr<nsIDirIndex> idx = do_CreateInstance("@mozilla.org/dirIndex;1",&rv);
             if (NS_FAILED(rv))
               return rv;
             rv = ParseData(idx, ((char *)buf) + 4);
             if (NS_FAILED(rv)) {
               return rv;
             }
             mListener->OnIndexAvailable(aRequest, aCtxt, idx);
           }
         }
       } else if (buf[0] == '3') {
         if (buf[1] == '0') {
           if (buf[2] == '0' && buf[3] == ':') {
             // 300. Self-referring URL
           } else if (buf[2] == '1' && buf[3] == ':') {
             // 301. OUR EXTENSION - encoding
             int i = 4;
             while (buf[i] && nsCRT::IsAsciiSpace(buf[i]))
               ++i;
             if (buf[i])
               SetEncoding(buf+i);
           }
         }
       }
     }
   }
   return NS_OK;
 }

The Tor Browser / annotate

netwerk/streamconv/converters/nsDirIndexParser.cpp@a63d609f5ebe (annotated)

netwerk/streamconv/converters/nsDirIndexParser.cpp