Split FTP LIST parsing code into individual files for each listing style.

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"
+
+namespace {
+
+bool LooksLikeUnixPermission(const string16& text) {
+  if (text.length() != 3)
+    return false;
+
+  // Meaning of the flags:
+  // r - file is readable
+  // w - file is writable
+  // x - file is executable
+  // s or S - setuid/setgid bit set
+  // t or T - "sticky" bit set
+  return ((text[0] == 'r' || text[0] == '-') &&
+          (text[1] == 'w' || text[1] == '-') &&
+          (text[2] == 'x' || text[2] == 's' || text[2] == 'S' ||
+           text[2] == 't' || text[2] == 'T' || text[2] == '-'));
+}
+
+bool LooksLikeUnixPermissionsListing(const string16& text) {
+  if (text.length() != 10)
+    return false;
+
+  if (text[0] != 'b' && text[0] != 'c' && text[0] != 'd' &&
+      text[0] != 'l' && text[0] != 'p' && text[0] != 's' &&
+      text[0] != '-')
+    return false;
+
+  return (LooksLikeUnixPermission(text.substr(1, 3)) &&
+          LooksLikeUnixPermission(text.substr(4, 3)) &&
+          LooksLikeUnixPermission(text.substr(7, 3)));
+}
+
+string16 GetStringPartAfterColumns(const string16& text, int columns) {
+  DCHECK_LE(1, columns);
+  int columns_so_far = 0;
+  size_t last = 0;
+  for (size_t i = 1; i < text.length(); ++i) {
+    if (!isspace(text[i - 1]) && isspace(text[i])) {
+      last = i;
+      if (++columns_so_far == columns)
+        break;
+    }
+  }
+  string16 result(text.substr(last));
+  TrimWhitespace(result, TRIM_ALL, &result);
+  return result;
+}
+
+bool UnixDateListingToTime(const std::vector<string16>& columns,
+                           base::Time* time) {
+  DCHECK_LE(9U, columns.size());
+
+  base::Time::Exploded time_exploded = { 0 };
+
+  if (!net::FtpUtil::ThreeLetterMonthToNumber(columns[5], &time_exploded.month))
+    return false;
+
+  if (!StringToInt(columns[6], &time_exploded.day_of_month))
+    return false;
+
+  if (!StringToInt(columns[7], &time_exploded.year)) {
+    // Maybe it's time. Does it look like time (MM:HH)?
+    if (columns[7].length() != 5 || columns[7][2] != ':')
+      return false;
+
+    if (!StringToInt(columns[7].substr(0, 2), &time_exploded.hour))
+      return false;
+
+    if (!StringToInt(columns[7].substr(3, 2), &time_exploded.minute))
+      return false;
+
+    // Use current year.
+    base::Time::Exploded now_exploded;
+    base::Time::Now().LocalExplode(&now_exploded);
+    time_exploded.year = now_exploded.year;
+  }
+
+  // We don't know the time zone of the server, so just use local time.
+  *time = base::Time::FromLocalExploded(time_exploded);
+  return true;
+}
+
+}  // namespace
+
+namespace net {
+
+FtpDirectoryListingParserLs::FtpDirectoryListingParserLs()
+    : received_nonempty_line_(false) {
+}
+
+bool FtpDirectoryListingParserLs::ConsumeLine(const string16& line) {
+  if (StartsWith(line, ASCIIToUTF16("total "), true) ||
+      StartsWith(line, ASCIIToUTF16("Gesamt "), true)) {
+    // 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.
+    //
+    // Note: "Gesamt" is a German word for "total". The case is important here:
+    // for "ls -l" style listings, "total" will be lowercase, and Gesamt will be
+    // capitalized. This helps us distinguish that from a VMS-style listing,
+    // which would use "Total" (note the uppercase first letter).
+
+    if (received_nonempty_line_)
+      return false;
+
+    received_nonempty_line_ = true;
+    return true;
+  }
+  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);
+
+  // 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)
+    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))
+    return false;
+  if (entry.size < 0)
+    return false;
+  if (entry.type != FtpDirectoryListingEntry::FILE)
+    entry.size = -1;
+
+  if (!UnixDateListingToTime(columns, &entry.last_modified))
+    return false;
+
+  entry.name = GetStringPartAfterColumns(line, 8);
+  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