Java tutorial
/* * Overchan Android (Meta Imageboard Client) * Copyright (C) 2014-2016 miku-nyan <https://github.com/miku-nyan> * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package nya.miku.wishmaster.api; import java.io.BufferedReader; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.Reader; import java.nio.charset.Charset; import java.util.ArrayList; import java.util.Arrays; import java.util.Collections; import java.util.List; import java.util.Locale; import java.util.regex.Matcher; import java.util.regex.Pattern; import org.apache.commons.lang3.StringEscapeUtils; import org.apache.commons.lang3.tuple.Pair; import cz.msebera.android.httpclient.Header; import cz.msebera.android.httpclient.HttpHeaders; import cz.msebera.android.httpclient.NameValuePair; import cz.msebera.android.httpclient.client.HttpClient; import cz.msebera.android.httpclient.client.entity.UrlEncodedFormEntity; import cz.msebera.android.httpclient.entity.mime.content.ByteArrayBody; import cz.msebera.android.httpclient.message.BasicHeader; import cz.msebera.android.httpclient.message.BasicNameValuePair; import nya.miku.wishmaster.api.interfaces.CancellableTask; import nya.miku.wishmaster.api.interfaces.ProgressListener; import nya.miku.wishmaster.api.models.AttachmentModel; import nya.miku.wishmaster.api.models.BadgeIconModel; import nya.miku.wishmaster.api.models.BoardModel; import nya.miku.wishmaster.api.models.DeletePostModel; import nya.miku.wishmaster.api.models.PostModel; import nya.miku.wishmaster.api.models.SendPostModel; import nya.miku.wishmaster.api.models.ThreadModel; import nya.miku.wishmaster.api.models.UrlPageModel; import nya.miku.wishmaster.api.util.ChanModels; import nya.miku.wishmaster.api.util.CryptoUtils; import nya.miku.wishmaster.api.util.RegexUtils; import nya.miku.wishmaster.api.util.UrlPathUtils; import nya.miku.wishmaster.api.util.WakabaUtils; import nya.miku.wishmaster.common.IOUtils; import nya.miku.wishmaster.http.ExtendedMultipartBuilder; import nya.miku.wishmaster.http.streamer.HttpRequestModel; import nya.miku.wishmaster.http.streamer.HttpResponseModel; import nya.miku.wishmaster.http.streamer.HttpStreamer; import nya.miku.wishmaster.http.streamer.HttpWrongStatusCodeException; import nya.miku.wishmaster.lib.org_json.JSONArray; import nya.miku.wishmaster.lib.org_json.JSONObject; import android.content.SharedPreferences; import android.content.res.Resources; import android.support.annotation.NonNull; public abstract class AbstractVichanModule extends AbstractWakabaModule { private static final Pattern ATTACHMENT_EMBEDDED_LINK = Pattern.compile("<a[^>]*href=\"([^\">]*)\"[^>]*>"); private static final Pattern ATTACHMENT_EMBEDDED_THUMB = Pattern.compile("<img[^>]*src=\"([^\">]*)\"[^>]*>"); private static final Pattern ERROR_PATTERN = Pattern.compile("<h2 [^>]*>(.*?)</h2>"); public AbstractVichanModule(SharedPreferences preferences, Resources resources) { super(preferences, resources); } @Override public BoardModel getBoard(String shortName, ProgressListener listener, CancellableTask task) throws Exception { BoardModel board = super.getBoard(shortName, listener, task); board.timeZoneId = "UTC"; board.defaultUserName = "Anonymous"; board.readonlyBoard = false; board.requiredFileForNewThread = true; board.allowDeletePosts = true; board.allowDeleteFiles = true; board.allowReport = BoardModel.REPORT_WITH_COMMENT; board.allowNames = true; board.allowSubjects = true; board.allowSage = true; board.allowEmails = true; board.ignoreEmailIfSage = true; board.allowCustomMark = false; board.allowRandomHash = true; board.allowIcons = false; board.attachmentsMaxCount = 1; board.attachmentsFormatFilters = null; board.markType = BoardModel.MARK_BBCODE; board.firstPage = 1; board.catalogAllowed = true; return board; } @Override public ThreadModel[] getThreadsList(String boardName, int page, ProgressListener listener, CancellableTask task, ThreadModel[] oldList) throws Exception { String url = getUsingUrl() + boardName + "/" + (page - 1) + ".json"; JSONObject response = downloadJSONObject(url, oldList != null, listener, task); if (response == null) return oldList; JSONArray threads = response.getJSONArray("threads"); ThreadModel[] result = new ThreadModel[threads.length()]; for (int i = 0, len = threads.length(); i < len; ++i) { JSONArray posts = threads.getJSONObject(i).getJSONArray("posts"); JSONObject op = posts.getJSONObject(0); ThreadModel curThread = mapThreadModel(op, boardName); curThread.posts = new PostModel[posts.length()]; for (int j = 0, plen = posts.length(); j < plen; ++j) { curThread.posts[j] = mapPostModel(posts.getJSONObject(j), boardName); } result[i] = curThread; } return result; } @Override public PostModel[] getPostsList(String boardName, String threadNumber, ProgressListener listener, CancellableTask task, PostModel[] oldList) throws Exception { String url = getUsingUrl() + boardName + "/res/" + threadNumber + ".json"; JSONObject response = downloadJSONObject(url, oldList != null, listener, task); if (response == null) return oldList; JSONArray posts = response.getJSONArray("posts"); PostModel[] result = new PostModel[posts.length()]; for (int i = 0, len = posts.length(); i < len; ++i) { result[i] = mapPostModel(posts.getJSONObject(i), boardName); } if (oldList != null) { result = ChanModels.mergePostsLists(Arrays.asList(oldList), Arrays.asList(result)); } return result; } @Override public ThreadModel[] getCatalog(String boardName, int catalogType, ProgressListener listener, CancellableTask task, ThreadModel[] oldList) throws Exception { String url = getUsingUrl() + boardName + "/catalog.json"; JSONArray response = downloadJSONArray(url, oldList != null, listener, task); if (response == null) return oldList; List<ThreadModel> threads = new ArrayList<>(); for (int i = 0, len = response.length(); i < len; ++i) { JSONArray curArray = response.getJSONObject(i).getJSONArray("threads"); for (int j = 0, clen = curArray.length(); j < clen; ++j) { JSONObject curThreadJson = curArray.getJSONObject(j); ThreadModel curThread = new ThreadModel(); curThread.threadNumber = Long.toString(curThreadJson.getLong("no")); curThread.postsCount = curThreadJson.optInt("replies", -2) + 1; curThread.attachmentsCount = curThreadJson.optInt("images", -2) + 1; curThread.isSticky = curThreadJson.optInt("sticky") == 1; curThread.isClosed = curThreadJson.optInt("closed") == 1; curThread.posts = new PostModel[] { mapPostModel(curThreadJson, boardName) }; threads.add(curThread); } } return threads.toArray(new ThreadModel[threads.size()]); } protected ThreadModel mapThreadModel(JSONObject opPost, String boardName) { ThreadModel curThread = new ThreadModel(); curThread.threadNumber = Long.toString(opPost.getLong("no")); curThread.postsCount = opPost.optInt("replies", -2) + 1; curThread.attachmentsCount = opPost.optInt("images", -2) + 1; if (curThread.attachmentsCount >= 0) curThread.attachmentsCount += opPost.optInt("omitted_images", 0); curThread.isSticky = opPost.optInt("sticky") == 1; curThread.isClosed = opPost.optInt("closed") == 1; return curThread; } protected PostModel mapPostModel(JSONObject object, String boardName) { PostModel model = new PostModel(); model.number = Long.toString(object.getLong("no")); model.name = StringEscapeUtils .unescapeHtml4(RegexUtils.removeHtmlSpanTags(object.optString("name", "Anonymous"))); model.subject = StringEscapeUtils.unescapeHtml4(object.optString("sub", "")); model.comment = object.optString("com", ""); model.email = object.optString("email", ""); model.trip = object.optString("trip", ""); String capcode = object.optString("capcode", "none"); if (!capcode.equals("none")) model.trip += "##" + capcode; String countryIcon = object.optString("country", ""); if (!countryIcon.equals("")) { BadgeIconModel icon = new BadgeIconModel(); icon.source = "/static/flags/" + countryIcon.toLowerCase(Locale.US) + ".png"; icon.description = object.optString("country_name"); model.icons = new BadgeIconModel[] { icon }; } model.op = false; String id = object.optString("id", ""); model.sage = id.equalsIgnoreCase("Heaven") || model.email.toLowerCase(Locale.US).contains("sage"); if (!id.equals("")) model.name += (" ID:" + id); if (!id.equals("") && !id.equalsIgnoreCase("Heaven")) model.color = CryptoUtils.hashIdColor(id); model.timestamp = object.getLong("time") * 1000; model.parentThread = object.optString("resto", "0"); if (model.parentThread.equals("0")) model.parentThread = model.number; List<AttachmentModel> attachments = null; boolean isSpoiler = object.optInt("spoiler") == 1; AttachmentModel rootAttachment = mapAttachment(object, boardName, isSpoiler); if (rootAttachment != null) { attachments = new ArrayList<>(); attachments.add(rootAttachment); JSONArray extraFiles = object.optJSONArray("extra_files"); if (extraFiles != null && extraFiles.length() != 0) { for (int i = 0, len = extraFiles.length(); i < len; ++i) { AttachmentModel attachment = mapAttachment(extraFiles.getJSONObject(i), boardName, isSpoiler); if (attachment != null) attachments.add(attachment); } } } String embed = object.optString("embed", ""); if (!embed.equals("")) { AttachmentModel embedAttachment = new AttachmentModel(); embedAttachment.type = AttachmentModel.TYPE_OTHER_NOTFILE; Matcher linkMatcher = ATTACHMENT_EMBEDDED_LINK.matcher(embed); if (linkMatcher.find()) { embedAttachment.path = linkMatcher.group(1); if (embedAttachment.path.startsWith("//")) embedAttachment.path = (useHttps() ? "https:" : "http:") + embedAttachment.path; Matcher thumbMatcher = ATTACHMENT_EMBEDDED_THUMB.matcher(embed); if (thumbMatcher.find()) { embedAttachment.thumbnail = thumbMatcher.group(1); if (embedAttachment.thumbnail.startsWith("//")) embedAttachment.thumbnail = (useHttps() ? "https:" : "http:") + embedAttachment.thumbnail; } embedAttachment.isSpoiler = isSpoiler; embedAttachment.size = -1; if (attachments != null) attachments.add(embedAttachment); else attachments = Collections.singletonList(embedAttachment); } } if (attachments != null) model.attachments = attachments.toArray(new AttachmentModel[attachments.size()]); return model; } protected AttachmentModel mapAttachment(JSONObject object, String boardName, boolean isSpoiler) { String ext = object.optString("ext", ""); if (!ext.equals("")) { AttachmentModel attachment = new AttachmentModel(); switch (ext) { case ".jpeg": case ".jpg": case ".png": attachment.type = AttachmentModel.TYPE_IMAGE_STATIC; break; case ".gif": attachment.type = AttachmentModel.TYPE_IMAGE_GIF; break; case ".svg": case ".svgz": attachment.type = AttachmentModel.TYPE_IMAGE_SVG; break; case ".mp3": case ".ogg": attachment.type = AttachmentModel.TYPE_AUDIO; break; case ".webm": case ".mp4": attachment.type = AttachmentModel.TYPE_VIDEO; break; default: attachment.type = AttachmentModel.TYPE_OTHER_FILE; } attachment.size = object.optInt("fsize", -1); if (attachment.size > 0) attachment.size = Math.round(attachment.size / 1024f); attachment.width = object.optInt("w", -1); attachment.height = object.optInt("h", -1); attachment.originalName = object.optString("filename", "") + ext; attachment.isSpoiler = isSpoiler; String tim = object.optString("tim", ""); if (tim.length() > 0) { attachment.thumbnail = isSpoiler || attachment.type == AttachmentModel.TYPE_AUDIO ? null : getAttachmentThumbnailPath(boardName, ext, tim); attachment.path = getAttachmentPath(boardName, ext, tim); return attachment; } } return null; } @NonNull protected String getAttachmentPath(String boardName, String ext, String tim) { return "/" + boardName + "/src/" + tim + ext; } @NonNull protected String getAttachmentThumbnailPath(String boardName, String ext, String tim) { return "/" + boardName + "/thumb/" + tim + ".jpg"; } @Override public String sendPost(SendPostModel model, ProgressListener listener, CancellableTask task) throws Exception { UrlPageModel urlModel = new UrlPageModel(); urlModel.chanName = getChanName(); urlModel.boardName = model.boardName; if (model.threadNumber == null) { urlModel.type = UrlPageModel.TYPE_BOARDPAGE; urlModel.boardPage = UrlPageModel.DEFAULT_FIRST_PAGE; } else { urlModel.type = UrlPageModel.TYPE_THREADPAGE; urlModel.threadNumber = model.threadNumber; } String referer = buildUrl(urlModel); List<Pair<String, String>> fields = VichanAntiBot.getFormValues(referer, task, httpClient); if (task != null && task.isCancelled()) throw new Exception("interrupted"); ExtendedMultipartBuilder postEntityBuilder = ExtendedMultipartBuilder.create() .setCharset(Charset.forName("UTF-8")).setDelegates(listener, task); for (Pair<String, String> pair : fields) { if (pair.getKey().equals("spoiler") && !model.custommark) continue; String val; switch (pair.getKey()) { case "name": val = model.name; break; case "email": val = getSendPostEmail(model); break; case "subject": val = model.subject; break; case "body": val = model.comment; break; case "password": val = model.password; break; case "spoiler": val = "on"; break; default: val = pair.getValue(); } if (pair.getKey().equals("file")) { if (model.attachments != null && model.attachments.length > 0) { postEntityBuilder.addFile(pair.getKey(), model.attachments[0], model.randomHash); } else { postEntityBuilder.addPart(pair.getKey(), new ByteArrayBody(new byte[0], "")); } } else { postEntityBuilder.addString(pair.getKey(), val); } } String url = getUsingUrl() + "post.php"; Header[] customHeaders = new Header[] { new BasicHeader(HttpHeaders.REFERER, referer) }; HttpRequestModel request = HttpRequestModel.builder().setPOST(postEntityBuilder.build()) .setCustomHeaders(customHeaders).setNoRedirect(true).build(); HttpResponseModel response = null; try { response = HttpStreamer.getInstance().getFromUrl(url, request, httpClient, listener, task); if (response.statusCode == 200 || response.statusCode == 400) { ByteArrayOutputStream output = new ByteArrayOutputStream(1024); IOUtils.copyStream(response.stream, output); String htmlResponse = output.toString("UTF-8"); Matcher errorMatcher = ERROR_PATTERN.matcher(htmlResponse); if (errorMatcher.find()) throw new Exception(errorMatcher.group(1)); } else if (response.statusCode == 303) { for (Header header : response.headers) { if (header != null && HttpHeaders.LOCATION.equalsIgnoreCase(header.getName())) { return fixRelativeUrl(header.getValue()); } } } throw new Exception(response.statusCode + " - " + response.statusReason); } finally { if (response != null) response.release(); } } @Override public String deletePost(DeletePostModel model, ProgressListener listener, CancellableTask task) throws Exception { String url = getUsingUrl() + "post.php"; List<NameValuePair> pairs = new ArrayList<NameValuePair>(); pairs.add(new BasicNameValuePair("board", model.boardName)); pairs.add(new BasicNameValuePair("delete_" + model.postNumber, "on")); if (model.onlyFiles) pairs.add(new BasicNameValuePair("file", "on")); pairs.add(new BasicNameValuePair("password", model.password)); pairs.add(new BasicNameValuePair("delete", getDeleteFormValue(model))); pairs.add(new BasicNameValuePair("reason", "")); UrlPageModel refererPage = new UrlPageModel(); refererPage.type = UrlPageModel.TYPE_THREADPAGE; refererPage.chanName = getChanName(); refererPage.boardName = model.boardName; refererPage.threadNumber = model.threadNumber; Header[] customHeaders = new Header[] { new BasicHeader(HttpHeaders.REFERER, buildUrl(refererPage)) }; HttpRequestModel rqModel = HttpRequestModel.builder().setPOST(new UrlEncodedFormEntity(pairs, "UTF-8")) .setCustomHeaders(customHeaders).setNoRedirect(true).build(); HttpResponseModel response = null; try { response = HttpStreamer.getInstance().getFromUrl(url, rqModel, httpClient, listener, task); if (response.statusCode == 200 || response.statusCode == 400 || response.statusCode == 303) { ByteArrayOutputStream output = new ByteArrayOutputStream(1024); IOUtils.copyStream(response.stream, output); String htmlResponse = output.toString("UTF-8"); Matcher errorMatcher = ERROR_PATTERN.matcher(htmlResponse); if (errorMatcher.find()) throw new Exception(errorMatcher.group(1)); return null; } throw new Exception(response.statusCode + " - " + response.statusReason); } finally { if (response != null) response.release(); } } @Override public String reportPost(DeletePostModel model, ProgressListener listener, CancellableTask task) throws Exception { String url = getUsingUrl() + "post.php"; List<NameValuePair> pairs = new ArrayList<NameValuePair>(); pairs.add(new BasicNameValuePair("board", model.boardName)); pairs.add(new BasicNameValuePair("delete_" + model.postNumber, "on")); pairs.add(new BasicNameValuePair("password", "")); pairs.add(new BasicNameValuePair("reason", model.reportReason)); pairs.add(new BasicNameValuePair("report", getReportFormValue(model))); UrlPageModel refererPage = new UrlPageModel(); refererPage.type = UrlPageModel.TYPE_THREADPAGE; refererPage.chanName = getChanName(); refererPage.boardName = model.boardName; refererPage.threadNumber = model.threadNumber; Header[] customHeaders = new Header[] { new BasicHeader(HttpHeaders.REFERER, buildUrl(refererPage)) }; HttpRequestModel rqModel = HttpRequestModel.builder().setPOST(new UrlEncodedFormEntity(pairs, "UTF-8")) .setCustomHeaders(customHeaders).setNoRedirect(true).build(); HttpResponseModel response = null; try { response = HttpStreamer.getInstance().getFromUrl(url, rqModel, httpClient, listener, task); if (response.statusCode == 200 || response.statusCode == 400 || response.statusCode == 303) { ByteArrayOutputStream output = new ByteArrayOutputStream(1024); IOUtils.copyStream(response.stream, output); String htmlResponse = output.toString("UTF-8"); Matcher errorMatcher = ERROR_PATTERN.matcher(htmlResponse); if (errorMatcher.find()) throw new Exception(errorMatcher.group(1)); return null; } throw new Exception(response.statusCode + " - " + response.statusReason); } finally { if (response != null) response.release(); } } protected String getSendPostEmail(SendPostModel model) { return model.sage ? "sage" : model.email; } protected String getDeleteFormValue(DeletePostModel model) { return "Delete"; } protected String getReportFormValue(DeletePostModel model) { return "Report"; } @Override public String buildUrl(UrlPageModel model) throws IllegalArgumentException { if (!model.chanName.equals(getChanName())) throw new IllegalArgumentException("wrong chan"); if (model.type == UrlPageModel.TYPE_CATALOGPAGE) return getUsingUrl() + model.boardName + "/catalog.html"; if (model.type == UrlPageModel.TYPE_BOARDPAGE && model.boardPage == 1) return (getUsingUrl() + model.boardName + "/"); return WakabaUtils.buildUrl(model, getUsingUrl()); } @Override public UrlPageModel parseUrl(String url) throws IllegalArgumentException { String urlPath = UrlPathUtils.getUrlPath(url, getAllDomains()); if (urlPath == null) throw new IllegalArgumentException("wrong domain"); if (url.contains("/catalog.html")) { try { int index = url.indexOf("/catalog.html"); String left = url.substring(0, index); UrlPageModel model = new UrlPageModel(); model.chanName = getChanName(); model.type = UrlPageModel.TYPE_CATALOGPAGE; model.boardName = left.substring(left.lastIndexOf('/') + 1); model.catalogType = 0; return model; } catch (Exception e) { } } UrlPageModel model = WakabaUtils.parseUrlPath(urlPath, getChanName()); if (model.type == UrlPageModel.TYPE_BOARDPAGE && model.boardPage == 0) model.boardPage = 1; return model; } @Override public void downloadFile(String url, OutputStream out, ProgressListener listener, CancellableTask task) throws Exception { try { super.downloadFile(url, out, listener, task); } catch (HttpWrongStatusCodeException e) { if (url.contains("/thumb/") && url.endsWith(".jpg") && e.getStatusCode() == 404) { super.downloadFile(url.substring(0, url.length() - 3) + "png", out, listener, task); } else { throw e; } } } @Override public String fixRelativeUrl(String url) { if (url.startsWith("?/")) url = url.substring(1); return super.fixRelativeUrl(url); } protected static class VichanAntiBot { public static List<Pair<String, String>> getFormValues(String url, CancellableTask task, HttpClient httpClient) throws Exception { return getFormValues(url, HttpRequestModel.DEFAULT_GET, task, httpClient, "<form name=\"post\"", "</form>"); } public static List<Pair<String, String>> getFormValues(String url, HttpRequestModel requestModel, CancellableTask task, HttpClient client, String startForm, String endForm) throws Exception { VichanAntiBot reader = null; HttpRequestModel request = requestModel; HttpResponseModel response = null; try { response = HttpStreamer.getInstance().getFromUrl(url, request, client, null, task); reader = new VichanAntiBot(response.stream, startForm, endForm); return reader.readForm(); } finally { if (reader != null) { try { reader.close(); } catch (Exception e) { } } if (response != null) response.release(); } } private StringBuilder readBuffer = new StringBuilder(); private List<Pair<String, String>> result = null; private String currentName = null; private String currentValue = null; private boolean currentTextarea = false; private boolean currentReading = false; private final char[] start; private final char[][] filters; private final Reader in; private static final int FILTER_INPUT_OPEN = 0; private static final int FILTER_TEXTAREA_OPEN = 1; private static final int FILTER_NAME_OPEN = 2; private static final int FILTER_VALUE_OPEN = 3; private static final int FILTER_TAG_CLOSE = 4; private static final int FILTER_TAG_BEFORE_CLOSE = 5; private VichanAntiBot(InputStream in, String start, String end) { this.start = start.toCharArray(); this.filters = new char[][] { "<input".toCharArray(), "<textarea".toCharArray(), "name=\"".toCharArray(), "value=\"".toCharArray(), ">".toCharArray(), "/".toCharArray(), end.toCharArray() }; this.in = new BufferedReader(new InputStreamReader(in)); } private List<Pair<String, String>> readForm() throws IOException { result = new ArrayList<>(); skipUntilSequence(start); int filtersCount = filters.length; int[] pos = new int[filtersCount]; int[] len = new int[filtersCount]; for (int i = 0; i < filtersCount; ++i) len[i] = filters[i].length; int curChar; while ((curChar = in.read()) != -1) { for (int i = 0; i < filtersCount; ++i) { if (curChar == filters[i][pos[i]]) { ++pos[i]; if (pos[i] == len[i]) { if (i == filtersCount - 1) { return result; } handleFilter(i); pos[i] = 0; } } else { if (pos[i] != 0) pos[i] = curChar == filters[i][0] ? 1 : 0; } } } return result; } private void handleFilter(int i) throws IOException { switch (i) { case FILTER_INPUT_OPEN: currentReading = true; currentTextarea = false; break; case FILTER_TEXTAREA_OPEN: currentReading = true; currentTextarea = true; break; case FILTER_NAME_OPEN: currentName = StringEscapeUtils.unescapeHtml4(readUntilSequence("\"".toCharArray())); break; case FILTER_VALUE_OPEN: currentValue = StringEscapeUtils.unescapeHtml4(readUntilSequence("\"".toCharArray())); break; case FILTER_TAG_CLOSE: if (currentTextarea) { currentValue = StringEscapeUtils.unescapeHtml4(readUntilSequence("<".toCharArray())); } if (currentReading && currentName != null) result.add(Pair.of(currentName, currentValue != null ? currentValue : "")); currentName = null; currentValue = null; currentReading = false; currentTextarea = false; break; case FILTER_TAG_BEFORE_CLOSE: // <textarea ..... /> currentTextarea = false; break; } } private void skipUntilSequence(char[] sequence) throws IOException { int len = sequence.length; if (len == 0) return; int pos = 0; int curChar; while ((curChar = in.read()) != -1) { if (curChar == sequence[pos]) { ++pos; if (pos == len) break; } else { if (pos != 0) pos = curChar == sequence[0] ? 1 : 0; } } } private String readUntilSequence(char[] sequence) throws IOException { int len = sequence.length; if (len == 0) return ""; readBuffer.setLength(0); int pos = 0; int curChar; while ((curChar = in.read()) != -1) { readBuffer.append((char) curChar); if (curChar == sequence[pos]) { ++pos; if (pos == len) break; } else { if (pos != 0) pos = curChar == sequence[0] ? 1 : 0; } } int buflen = readBuffer.length(); if (buflen >= len) { readBuffer.setLength(buflen - len); return readBuffer.toString(); } else { return ""; } } public void close() throws IOException { in.close(); } } }