public static byte[] Import_url_build(
     byte[] stylesheet_prefix, byte[] rel_url_prefix, byte[] css_url) {
   return Bry_.Has_at_bgn(
           css_url,
           Bry_http_protocol) // css_url already starts with "http"; return self;
                              // PAGE:tr.n:Main_Page; DATE:2014-06-04
       ? css_url
       : Bry_.Add(stylesheet_prefix, css_url);
 }
 private int Import_url_chk(
     byte[] rel_url_prefix,
     byte[] src,
     int src_len,
     int old_pos,
     int find_bgn,
     byte[] url_raw,
     Bry_bfr bfr) {
   if (find_bgn < Bry_import_len) return Bry_find_.Not_found;
   if (!Bry_.Match(src, find_bgn - Bry_import_len, find_bgn, Bry_import))
     return Bry_find_.Not_found;
   byte[] css_url = url_raw;
   int css_url_len = css_url.length;
   if (css_url_len > 0
       && css_url[0]
           == Byte_ascii
               .Slash) { // css_url starts with "/"; EX: "/page" or "//site/page" DATE:2014-02-03
     if (css_url_len > 1
         && css_url[1] != Byte_ascii.Slash) // skip if css_url starts with "//"; EX: "//site/page"
     css_url = Bry_.Add(rel_url_prefix, css_url); // "/w/a.css" -> "//en.wikipedia.org/w/a.css"
   }
   css_url =
       Bry_.Replace(
           css_url,
           Byte_ascii.Space,
           Byte_ascii
               .Underline); // NOTE: must replace spaces with underlines else download will fail;
                            // EX:https://it.wikivoyage.org/w/index.php?title=MediaWiki:Container e
                            // Infobox.css&action=raw&ctype=text/css; DATE:2015-03-08
   byte[] css_src_bry = Import_url_build(stylesheet_prefix, rel_url_prefix, css_url);
   String css_src_str = String_.new_u8(css_src_bry);
   download_wkr.Download_xrg()
       .Prog_fmt_hdr_(
           usr_dlg.Log_many(
               GRP_KEY, "logo.download", "downloading import for '~{0}'", css_src_str));
   byte[] css_trg_bry = download_wkr.Download_xrg().Exec_as_bry(css_src_str);
   if (css_trg_bry == null) {
     usr_dlg.Warn_many("", "", "could not import css: url=~{0}", css_src_str);
     return Bry_find_.Not_found; // css not found
   }
   bfr.Add_mid(src, old_pos, find_bgn - Bry_import_len).Add_byte_nl();
   bfr.Add(Bry_comment_bgn).Add(css_url).Add(Bry_comment_end).Add_byte_nl();
   if (Bry_find_.Find_fwd(css_url, Wikisource_dynimg_ttl) != -1)
     css_trg_bry =
         Bry_.Replace(
             css_trg_bry,
             Wikisource_dynimg_find,
             Wikisource_dynimg_repl); // FreedImg hack;
                                      // PAGE:en.s:Page:Notes_on_Osteology_of_Baptanodon._With_a_Description_of_a_New_Species.pdf/3 DATE:2014-09-06
   bfr.Add(css_trg_bry).Add_byte_nl();
   bfr.Add_byte_nl();
   int semic_pos = Bry_find_.Find_fwd(src, Byte_ascii.Semic, find_bgn + url_raw.length, src_len);
   return semic_pos + Int_.Const_dlm_len;
 }
 public byte[] Clean_img_url(byte[] raw, int raw_len) {
   int pos_bgn = 0;
   if (Bry_.Has_at_bgn(raw, Bry_fwd_slashes, 0, raw_len)) pos_bgn = Bry_fwd_slashes.length;
   if (Bry_.Has_at_bgn(raw, Bry_http, 0, raw_len)) pos_bgn = Bry_http.length;
   int pos_slash = Bry_find_.Find_fwd(raw, Byte_ascii.Slash, pos_bgn, raw_len);
   if (pos_slash == Bry_find_.Not_found)
     return null; // first segment is site_name; at least one slash must be present for image name;
                  // EX: site.org/img_name.jpg
   if (pos_slash == raw_len - 1) return null; // "site.org/" is invalid
   int pos_end = raw_len;
   int pos_question = Bry_find_.Find_bwd(raw, Byte_ascii.Question);
   if (pos_question != Bry_find_.Not_found)
     pos_end = pos_question; // remove query params; EX: img_name?key=val
   return Bry_.Mid(raw, pos_bgn, pos_end);
 }
 public void Chk(byte[] wiki_domain, Io_url css_fil) {
   this.wiki_domain = wiki_domain;
   List_adp img_list = List_adp_.New();
   byte[] old_bry = Io_mgr.Instance.LoadFilBry(css_fil);
   byte[] rel_url_prefix = Bry_.Add(Bry_fwd_slashes, wiki_domain);
   byte[] new_bry = Convert_to_local_urls(rel_url_prefix, old_bry, img_list);
   Io_url img_dir = css_fil.OwnerDir();
   Download_fils(img_dir, img_list.To_str_ary());
   Io_mgr.Instance.SaveFilBry(css_fil, new_bry);
 }
public class Xoa_css_img_downloader {
  private byte[] wiki_domain;

  public Xoa_css_img_downloader Ctor(
      Gfo_usr_dlg usr_dlg, Xof_download_wkr download_wkr, byte[] stylesheet_prefix) {
    this.usr_dlg = usr_dlg;
    this.download_wkr = download_wkr;
    this.stylesheet_prefix = stylesheet_prefix;
    return this;
  }

  private Gfo_usr_dlg usr_dlg;
  private Xof_download_wkr download_wkr;

  public Xoa_css_img_downloader Stylesheet_prefix_(byte[] v) {
    stylesheet_prefix = v;
    return this;
  }

  private byte[]
      stylesheet_prefix; // TEST: setter exposed b/c tests can handle "mem/" but not "//mem"

  public void Chk(byte[] wiki_domain, Io_url css_fil) {
    this.wiki_domain = wiki_domain;
    List_adp img_list = List_adp_.New();
    byte[] old_bry = Io_mgr.Instance.LoadFilBry(css_fil);
    byte[] rel_url_prefix = Bry_.Add(Bry_fwd_slashes, wiki_domain);
    byte[] new_bry = Convert_to_local_urls(rel_url_prefix, old_bry, img_list);
    Io_url img_dir = css_fil.OwnerDir();
    Download_fils(img_dir, img_list.To_str_ary());
    Io_mgr.Instance.SaveFilBry(css_fil, new_bry);
  }

  public byte[] Convert_to_local_urls(byte[] rel_url_prefix, byte[] src, List_adp list) {
    try {
      int src_len = src.length;
      int prv_pos = 0;
      Bry_bfr bfr = Bry_bfr_.New_w_size(src_len);
      Hash_adp img_hash = Hash_adp_bry.cs();
      while (true) {
        int url_pos = Bry_find_.Find_fwd(src, Bry_url, prv_pos);
        if (url_pos == Bry_find_.Not_found) {
          bfr.Add_mid(src, prv_pos, src_len);
          break;
        } // no more "url("; exit;
        int bgn_pos = url_pos + Bry_url_len; // set bgn_pos after "url("
        byte bgn_byte = src[bgn_pos];
        byte end_byte = Byte_ascii.Null;
        boolean quoted = true;
        switch (bgn_byte) { // find end_byte
          case Byte_ascii.Quote:
          case Byte_ascii.Apos: // quoted; end_byte is ' or "
            end_byte = bgn_byte;
            ++bgn_pos;
            break;
          default: // not quoted; end byte is ")"
            end_byte = Byte_ascii.Paren_end;
            quoted = false;
            break;
        }
        int end_pos = Bry_find_.Find_fwd(src, end_byte, bgn_pos, src_len);
        if (end_pos
            == Bry_find_.Not_found) { // unclosed "url("; exit since nothing else will be found
          usr_dlg.Warn_many(
              GRP_KEY,
              "parse.invalid_url.end_missing",
              "could not find end_sequence for 'url(': bgn='~{0}' end='~{1}'",
              prv_pos,
              String_.new_u8__by_len(src, prv_pos, prv_pos + 25));
          bfr.Add_mid(src, prv_pos, src_len);
          break;
        }
        if (end_pos - bgn_pos == 0) { // empty; "url()"; ignore
          usr_dlg.Warn_many(
              GRP_KEY,
              "parse.invalid_url.empty",
              "'url(' is empty: bgn='~{0}' end='~{1}'",
              prv_pos,
              String_.new_u8__by_len(src, prv_pos, prv_pos + 25));
          bfr.Add_mid(src, prv_pos, bgn_pos);
          prv_pos = bgn_pos;
          continue;
        }
        byte[] img_raw = Bry_.Mid(src, bgn_pos, end_pos);
        int img_raw_len = img_raw.length;
        if (Bry_.Has_at_bgn(img_raw, Bry_data_image, 0, img_raw_len)) { // base64
          bfr.Add_mid(src, prv_pos, end_pos); // nothing to download; just add entire String
          prv_pos = end_pos;
          continue;
        }
        int import_url_end =
            Import_url_chk(
                rel_url_prefix,
                src,
                src_len,
                prv_pos,
                url_pos,
                img_raw,
                bfr); // check for embedded stylesheets via @import tag
        if (import_url_end != Bry_find_.Not_found) {
          prv_pos = import_url_end;
          continue;
        }
        byte[] img_cleaned = Xob_url_fixer.Fix(wiki_domain, img_raw, img_raw_len);
        if (img_cleaned == null) { // could not clean img
          usr_dlg.Warn_many(
              GRP_KEY,
              "parse.invalid_url.clean_failed",
              "could not extract valid http src: bgn='~{0}' end='~{1}'",
              prv_pos,
              String_.new_u8(img_raw));
          bfr.Add_mid(src, prv_pos, bgn_pos);
          prv_pos = bgn_pos;
          continue;
        }
        if (!img_hash.Has(img_cleaned)) { // only add unique items for download;
          img_hash.Add_as_key_and_val(img_cleaned);
          list.Add(String_.new_u8(img_cleaned));
        }
        img_cleaned =
            Replace_invalid_chars(
                Bry_.Copy(
                    img_cleaned)); // NOTE: must call ByteAry.Copy else img_cleaned will change
                                   // *inside* hash
        bfr.Add_mid(src, prv_pos, bgn_pos);
        if (!quoted) bfr.Add_byte(Byte_ascii.Quote);
        bfr.Add(img_cleaned);
        if (!quoted) bfr.Add_byte(Byte_ascii.Quote);
        prv_pos = end_pos;
      }
      return bfr.To_bry_and_clear();
    } catch (Exception e) {
      usr_dlg.Warn_many(
          "",
          "",
          "failed to convert local_urls: ~{0} ~{1}",
          String_.new_u8(rel_url_prefix),
          Err_.Message_gplx_full(e));
      return src;
    }
  }

  public static byte[] Import_url_build(
      byte[] stylesheet_prefix, byte[] rel_url_prefix, byte[] css_url) {
    return Bry_.Has_at_bgn(
            css_url,
            Bry_http_protocol) // css_url already starts with "http"; return self;
                               // PAGE:tr.n:Main_Page; DATE:2014-06-04
        ? css_url
        : Bry_.Add(stylesheet_prefix, css_url);
  }

  private int Import_url_chk(
      byte[] rel_url_prefix,
      byte[] src,
      int src_len,
      int old_pos,
      int find_bgn,
      byte[] url_raw,
      Bry_bfr bfr) {
    if (find_bgn < Bry_import_len) return Bry_find_.Not_found;
    if (!Bry_.Match(src, find_bgn - Bry_import_len, find_bgn, Bry_import))
      return Bry_find_.Not_found;
    byte[] css_url = url_raw;
    int css_url_len = css_url.length;
    if (css_url_len > 0
        && css_url[0]
            == Byte_ascii
                .Slash) { // css_url starts with "/"; EX: "/page" or "//site/page" DATE:2014-02-03
      if (css_url_len > 1
          && css_url[1] != Byte_ascii.Slash) // skip if css_url starts with "//"; EX: "//site/page"
      css_url = Bry_.Add(rel_url_prefix, css_url); // "/w/a.css" -> "//en.wikipedia.org/w/a.css"
    }
    css_url =
        Bry_.Replace(
            css_url,
            Byte_ascii.Space,
            Byte_ascii
                .Underline); // NOTE: must replace spaces with underlines else download will fail;
                             // EX:https://it.wikivoyage.org/w/index.php?title=MediaWiki:Container e
                             // Infobox.css&action=raw&ctype=text/css; DATE:2015-03-08
    byte[] css_src_bry = Import_url_build(stylesheet_prefix, rel_url_prefix, css_url);
    String css_src_str = String_.new_u8(css_src_bry);
    download_wkr.Download_xrg()
        .Prog_fmt_hdr_(
            usr_dlg.Log_many(
                GRP_KEY, "logo.download", "downloading import for '~{0}'", css_src_str));
    byte[] css_trg_bry = download_wkr.Download_xrg().Exec_as_bry(css_src_str);
    if (css_trg_bry == null) {
      usr_dlg.Warn_many("", "", "could not import css: url=~{0}", css_src_str);
      return Bry_find_.Not_found; // css not found
    }
    bfr.Add_mid(src, old_pos, find_bgn - Bry_import_len).Add_byte_nl();
    bfr.Add(Bry_comment_bgn).Add(css_url).Add(Bry_comment_end).Add_byte_nl();
    if (Bry_find_.Find_fwd(css_url, Wikisource_dynimg_ttl) != -1)
      css_trg_bry =
          Bry_.Replace(
              css_trg_bry,
              Wikisource_dynimg_find,
              Wikisource_dynimg_repl); // FreedImg hack;
                                       // PAGE:en.s:Page:Notes_on_Osteology_of_Baptanodon._With_a_Description_of_a_New_Species.pdf/3 DATE:2014-09-06
    bfr.Add(css_trg_bry).Add_byte_nl();
    bfr.Add_byte_nl();
    int semic_pos = Bry_find_.Find_fwd(src, Byte_ascii.Semic, find_bgn + url_raw.length, src_len);
    return semic_pos + Int_.Const_dlm_len;
  }

  private static final byte[]
      Wikisource_dynimg_ttl =
          Bry_.new_a7("en.wikisource.org/w/index.php?title=MediaWiki:Dynimg.css"),
      Wikisource_dynimg_find =
          Bry_.new_a7(
              ".freedImg img[src*=\"wikipedia\"], .freedImg img[src*=\"wikisource\"], .freedImg img[src*=\"score\"], .freedImg img[src*=\"math\"] {"),
      Wikisource_dynimg_repl =
          Bry_.new_a7(
              ".freedImg img[src*=\"wikipedia\"], .freedImg img[src*=\"wikisource\"], /*XOWA:handle file:// paths which will have /commons.wikimedia.org/ but not /wikipedia/ */ .freedImg img[src*=\"wikimedia\"], .freedImg img[src*=\"score\"], .freedImg img[src*=\"math\"] {");

  public byte[] Clean_img_url(byte[] raw, int raw_len) {
    int pos_bgn = 0;
    if (Bry_.Has_at_bgn(raw, Bry_fwd_slashes, 0, raw_len)) pos_bgn = Bry_fwd_slashes.length;
    if (Bry_.Has_at_bgn(raw, Bry_http, 0, raw_len)) pos_bgn = Bry_http.length;
    int pos_slash = Bry_find_.Find_fwd(raw, Byte_ascii.Slash, pos_bgn, raw_len);
    if (pos_slash == Bry_find_.Not_found)
      return null; // first segment is site_name; at least one slash must be present for image name;
                   // EX: site.org/img_name.jpg
    if (pos_slash == raw_len - 1) return null; // "site.org/" is invalid
    int pos_end = raw_len;
    int pos_question = Bry_find_.Find_bwd(raw, Byte_ascii.Question);
    if (pos_question != Bry_find_.Not_found)
      pos_end = pos_question; // remove query params; EX: img_name?key=val
    return Bry_.Mid(raw, pos_bgn, pos_end);
  }

  private void Download_fils(Io_url css_dir, String[] ary) {
    int ary_len = ary.length;
    for (int i = 0; i < ary_len; i++) {
      String src = ary[i];
      Io_url trg =
          css_dir.GenSubFil_nest(
              Op_sys.Cur().Fsys_http_frag_to_url_str(Replace_invalid_chars_str(src)));
      if (Io_mgr.Instance.ExistsFil(trg)) continue;
      download_wkr.Download(true, "https://" + src, trg, "download: " + src); // ILN
      if (Io_mgr.Instance.QueryFil(trg).Size()
          == 0) { // warn if 0 byte files downloaded; DATE:2015-07-06
        Xoa_app_.Usr_dlg()
            .Warn_many("", "", "css.download; 0 byte file downloaded; file=~{0}", trg.Raw());
      }
    }
  }

  String Replace_invalid_chars_str(String raw_str) {
    return String_.new_u8(Replace_invalid_chars(Bry_.new_u8(raw_str)));
  }

  byte[] Replace_invalid_chars(byte[] raw_bry) {
    int raw_len = raw_bry.length;
    for (int i = 0; i < raw_len; i++) { // convert invalid wnt chars to underscores
      byte b = raw_bry[i];
      switch (b) {
          // case Byte_ascii.Slash:
        case Byte_ascii.Backslash:
        case Byte_ascii.Colon:
        case Byte_ascii.Star:
        case Byte_ascii.Question:
        case Byte_ascii.Quote:
        case Byte_ascii.Lt:
        case Byte_ascii.Gt:
        case Byte_ascii.Pipe:
          raw_bry[i] = Byte_ascii.Underline;
          break;
      }
    }
    return raw_bry;
  }

  private static final byte[] Bry_url = Bry_.new_a7("url("),
      Bry_data_image = Bry_.new_a7("data:image/"),
      Bry_http = Bry_.new_a7("http://"),
      Bry_fwd_slashes = Bry_.new_a7("//"),
      Bry_import = Bry_.new_a7("@import "),
      Bry_http_protocol = Bry_.new_a7("http");
  public static final byte[] Bry_comment_bgn = Bry_.new_a7("/*XOWA:"),
      Bry_comment_end = Bry_.new_a7("*/");
  private static final int Bry_url_len = Bry_url.length, Bry_import_len = Bry_import.length;
  static final String GRP_KEY = "xowa.wikis.init.css";
}
 public byte[] Convert_to_local_urls(byte[] rel_url_prefix, byte[] src, List_adp list) {
   try {
     int src_len = src.length;
     int prv_pos = 0;
     Bry_bfr bfr = Bry_bfr_.New_w_size(src_len);
     Hash_adp img_hash = Hash_adp_bry.cs();
     while (true) {
       int url_pos = Bry_find_.Find_fwd(src, Bry_url, prv_pos);
       if (url_pos == Bry_find_.Not_found) {
         bfr.Add_mid(src, prv_pos, src_len);
         break;
       } // no more "url("; exit;
       int bgn_pos = url_pos + Bry_url_len; // set bgn_pos after "url("
       byte bgn_byte = src[bgn_pos];
       byte end_byte = Byte_ascii.Null;
       boolean quoted = true;
       switch (bgn_byte) { // find end_byte
         case Byte_ascii.Quote:
         case Byte_ascii.Apos: // quoted; end_byte is ' or "
           end_byte = bgn_byte;
           ++bgn_pos;
           break;
         default: // not quoted; end byte is ")"
           end_byte = Byte_ascii.Paren_end;
           quoted = false;
           break;
       }
       int end_pos = Bry_find_.Find_fwd(src, end_byte, bgn_pos, src_len);
       if (end_pos
           == Bry_find_.Not_found) { // unclosed "url("; exit since nothing else will be found
         usr_dlg.Warn_many(
             GRP_KEY,
             "parse.invalid_url.end_missing",
             "could not find end_sequence for 'url(': bgn='~{0}' end='~{1}'",
             prv_pos,
             String_.new_u8__by_len(src, prv_pos, prv_pos + 25));
         bfr.Add_mid(src, prv_pos, src_len);
         break;
       }
       if (end_pos - bgn_pos == 0) { // empty; "url()"; ignore
         usr_dlg.Warn_many(
             GRP_KEY,
             "parse.invalid_url.empty",
             "'url(' is empty: bgn='~{0}' end='~{1}'",
             prv_pos,
             String_.new_u8__by_len(src, prv_pos, prv_pos + 25));
         bfr.Add_mid(src, prv_pos, bgn_pos);
         prv_pos = bgn_pos;
         continue;
       }
       byte[] img_raw = Bry_.Mid(src, bgn_pos, end_pos);
       int img_raw_len = img_raw.length;
       if (Bry_.Has_at_bgn(img_raw, Bry_data_image, 0, img_raw_len)) { // base64
         bfr.Add_mid(src, prv_pos, end_pos); // nothing to download; just add entire String
         prv_pos = end_pos;
         continue;
       }
       int import_url_end =
           Import_url_chk(
               rel_url_prefix,
               src,
               src_len,
               prv_pos,
               url_pos,
               img_raw,
               bfr); // check for embedded stylesheets via @import tag
       if (import_url_end != Bry_find_.Not_found) {
         prv_pos = import_url_end;
         continue;
       }
       byte[] img_cleaned = Xob_url_fixer.Fix(wiki_domain, img_raw, img_raw_len);
       if (img_cleaned == null) { // could not clean img
         usr_dlg.Warn_many(
             GRP_KEY,
             "parse.invalid_url.clean_failed",
             "could not extract valid http src: bgn='~{0}' end='~{1}'",
             prv_pos,
             String_.new_u8(img_raw));
         bfr.Add_mid(src, prv_pos, bgn_pos);
         prv_pos = bgn_pos;
         continue;
       }
       if (!img_hash.Has(img_cleaned)) { // only add unique items for download;
         img_hash.Add_as_key_and_val(img_cleaned);
         list.Add(String_.new_u8(img_cleaned));
       }
       img_cleaned =
           Replace_invalid_chars(
               Bry_.Copy(
                   img_cleaned)); // NOTE: must call ByteAry.Copy else img_cleaned will change
                                  // *inside* hash
       bfr.Add_mid(src, prv_pos, bgn_pos);
       if (!quoted) bfr.Add_byte(Byte_ascii.Quote);
       bfr.Add(img_cleaned);
       if (!quoted) bfr.Add_byte(Byte_ascii.Quote);
       prv_pos = end_pos;
     }
     return bfr.To_bry_and_clear();
   } catch (Exception e) {
     usr_dlg.Warn_many(
         "",
         "",
         "failed to convert local_urls: ~{0} ~{1}",
         String_.new_u8(rel_url_prefix),
         Err_.Message_gplx_full(e));
     return src;
   }
 }
 String Replace_invalid_chars_str(String raw_str) {
   return String_.new_u8(Replace_invalid_chars(Bry_.new_u8(raw_str)));
 }