Add support for wu-ftpd style FTP LIST response format.

net/ftp/ftp_directory_listing_parser_ls.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.  Use of this
 // source code is governed by a BSD-style license that can be found in the
 // LICENSE file.
 
 #include "net/ftp/ftp_directory_listing_parser_ls.h"
 
 #include <vector>
 
 #include "base/string_util.h"
 #include "net/ftp/ftp_util.h"
@@ skipping 39 matching lines @@
       last = i;
       if (++columns_so_far == columns)
         break;
     }
   }
   string16 result(text.substr(last));
   TrimWhitespace(result, TRIM_ALL, &result);
   return result;
 }
 
+bool DetectColumnOffset(const std::vector<string16>& columns, int* offset) {
+  base::Time time;
+
+  if (columns.size() >= 8 &&
+      net::FtpUtil::LsDateListingToTime(columns[5], columns[6], columns[7],
+                                        &time)) {
+    // Standard listing, exactly like ls -l.
+    *offset = 1;
+    return true;
+  }
+
+  if (columns.size() >= 7 &&
+      net::FtpUtil::LsDateListingToTime(columns[4], columns[5], columns[6],
+                                        &time)) {
+    // wu-ftpd listing, no "number of links" column.
+    *offset = 0;
+    return true;
+  }
+
+  // Unrecognized listing style.
+  return false;
+}
+
 }  // namespace
 
 namespace net {
 
 FtpDirectoryListingParserLs::FtpDirectoryListingParserLs()
     : received_nonempty_line_(false),
-      received_total_line_(false) {
+      received_total_line_(false),
+      column_offset_(-1) {
 }
 
 bool FtpDirectoryListingParserLs::ConsumeLine(const string16& line) {
+  std::vector<string16> columns;
+  SplitString(CollapseWhitespace(line, false), ' ', &columns);
+
   if (line.empty() && !received_nonempty_line_) {
     // Allow empty lines only at the beginning of the listing. For example VMS
     // systems in Unix emulation mode add an empty line before the first listing
     // entry.
     return true;
   }
-  received_nonempty_line_ = true;
-
-  std::vector<string16> columns;
-  SplitString(CollapseWhitespace(line, false), ' ', &columns);
-
   // Some FTP servers put a "total n" line at the beginning of the listing
   // (n is an integer). Allow such a line, but only once, and only if it's
   // the first non-empty line. Do not match the word exactly, because it may be
   // in different languages (at least English and German have been seen in the
   // field).
   if (columns.size() == 2 && !received_total_line_) {
     received_total_line_ = true;
 
     int total_number;
     if (!StringToInt(columns[1], &total_number))
       return false;
     if (total_number < 0)
       return false;
 
     return true;
   }
+  if (!received_nonempty_line_ && !DetectColumnOffset(columns, &column_offset_))
+    return false;
+  received_nonempty_line_ = true;
 
   // We may receive file names containing spaces, which can make the number of
   // columns arbitrarily large. We will handle that later. For now just make
   // sure we have all the columns that should normally be there.
-  if (columns.size() < 9)
+  if (columns.size() < 8U + column_offset_)
     return false;
 
   if (!LooksLikeUnixPermissionsListing(columns[0]))
     return false;
 
   FtpDirectoryListingEntry entry;
   if (columns[0][0] == 'l') {
     entry.type = FtpDirectoryListingEntry::SYMLINK;
   } else if (columns[0][0] == 'd') {
     entry.type = FtpDirectoryListingEntry::DIRECTORY;
   } else {
     entry.type = FtpDirectoryListingEntry::FILE;
   }
 
-  int number_of_links;
-  if (!StringToInt(columns[1], &number_of_links))
-    return false;
-  if (number_of_links < 0)
-    return false;
-
-  if (!StringToInt64(columns[4], &entry.size))
+  if (!StringToInt64(columns[3 + column_offset_], &entry.size))
     return false;
   if (entry.size < 0)
     return false;
   if (entry.type != FtpDirectoryListingEntry::FILE)
     entry.size = -1;
 
-  if (!FtpUtil::LsDateListingToTime(columns[5], columns[6], columns[7],
+  if (!FtpUtil::LsDateListingToTime(columns[4 + column_offset_],
+                                    columns[5 + column_offset_],
+                                    columns[6 + column_offset_],
                                     &entry.last_modified)) {
     return false;
   }
 
-  entry.name = GetStringPartAfterColumns(line, 8);
+  entry.name = GetStringPartAfterColumns(line, 7 + column_offset_);
   if (entry.type == FtpDirectoryListingEntry::SYMLINK) {
     string16::size_type pos = entry.name.rfind(ASCIIToUTF16(" -> "));
     if (pos == string16::npos)
       return false;
     entry.name = entry.name.substr(0, pos);
   }
 
   entries_.push(entry);
   return true;
 }
 
 bool FtpDirectoryListingParserLs::OnEndOfInput() {
   return true;
 }
 
 bool FtpDirectoryListingParserLs::EntryAvailable() const {
   return !entries_.empty();
 }
 
 FtpDirectoryListingEntry FtpDirectoryListingParserLs::PopEntry() {
   FtpDirectoryListingEntry entry = entries_.front();
   entries_.pop();
   return entry;
 }
 
 }  // namespace net