diff options
Diffstat (limited to 'src/main/java/com/lowagie/text/pdf/PRTokeniser.java')
| -rw-r--r-- | src/main/java/com/lowagie/text/pdf/PRTokeniser.java | 585 |
1 files changed, 585 insertions, 0 deletions
diff --git a/src/main/java/com/lowagie/text/pdf/PRTokeniser.java b/src/main/java/com/lowagie/text/pdf/PRTokeniser.java new file mode 100644 index 0000000..9aaa881 --- /dev/null +++ b/src/main/java/com/lowagie/text/pdf/PRTokeniser.java @@ -0,0 +1,585 @@ +/*
+ * $Id: PRTokeniser.java,v 1.51 2005/12/22 18:29:21 psoares33 Exp $
+ *
+ * Copyright 2001, 2002 by Paulo Soares.
+ *
+ * The contents of this file are subject to the Mozilla Public License Version 1.1
+ * (the "License"); you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the License.
+ *
+ * The Original Code is 'iText, a free JAVA-PDF library'.
+ *
+ * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
+ * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
+ * All Rights Reserved.
+ * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
+ * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
+ *
+ * Contributor(s): all the names of the contributors are added in the source code
+ * where applicable.
+ *
+ * Alternatively, the contents of this file may be used under the terms of the
+ * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
+ * provisions of LGPL are applicable instead of those above. If you wish to
+ * allow use of your version of this file only under the terms of the LGPL
+ * License and not to allow others to use your version of this file under
+ * the MPL, indicate your decision by deleting the provisions above and
+ * replace them with the notice and other provisions required by the LGPL.
+ * If you do not delete the provisions above, a recipient may use your version
+ * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the MPL as stated above or under the terms of the GNU
+ * Library General Public License as published by the Free Software Foundation;
+ * either version 2 of the License, or any later version.
+ *
+ * This library 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 Library general Public License for more
+ * details.
+ *
+ * If you didn't download this code from the following link, you should check if
+ * you aren't using an obsolete version:
+ * http://www.lowagie.com/iText/
+ */
+
+package com.lowagie.text.pdf;
+
+import java.io.*;
+/**
+ *
+ * @author Paulo Soares (psoares@consiste.pt)
+ */
+public class PRTokeniser {
+
+ public static final int TK_NUMBER = 1;
+ public static final int TK_STRING = 2;
+ public static final int TK_NAME = 3;
+ public static final int TK_COMMENT = 4;
+ public static final int TK_START_ARRAY = 5;
+ public static final int TK_END_ARRAY = 6;
+ public static final int TK_START_DIC = 7;
+ public static final int TK_END_DIC = 8;
+ public static final int TK_REF = 9;
+ public static final int TK_OTHER = 10;
+ public static final boolean delims[] = {
+ true, true, false, false, false, false, false, false, false, false,
+ true, true, false, true, true, false, false, false, false, false,
+ false, false, false, false, false, false, false, false, false, false,
+ false, false, false, true, false, false, false, false, true, false,
+ false, true, true, false, false, false, false, false, true, false,
+ false, false, false, false, false, false, false, false, false, false,
+ false, true, false, true, false, false, false, false, false, false,
+ false, false, false, false, false, false, false, false, false, false,
+ false, false, false, false, false, false, false, false, false, false,
+ false, false, true, false, true, false, false, false, false, false,
+ false, false, false, false, false, false, false, false, false, false,
+ false, false, false, false, false, false, false, false, false, false,
+ false, false, false, false, false, false, false, false, false, false,
+ false, false, false, false, false, false, false, false, false, false,
+ false, false, false, false, false, false, false, false, false, false,
+ false, false, false, false, false, false, false, false, false, false,
+ false, false, false, false, false, false, false, false, false, false,
+ false, false, false, false, false, false, false, false, false, false,
+ false, false, false, false, false, false, false, false, false, false,
+ false, false, false, false, false, false, false, false, false, false,
+ false, false, false, false, false, false, false, false, false, false,
+ false, false, false, false, false, false, false, false, false, false,
+ false, false, false, false, false, false, false, false, false, false,
+ false, false, false, false, false, false, false, false, false, false,
+ false, false, false, false, false, false, false, false, false, false,
+ false, false, false, false, false, false, false};
+
+ static final String EMPTY = "";
+
+
+ protected RandomAccessFileOrArray file;
+ protected int type;
+ protected String stringValue;
+ protected int reference;
+ protected int generation;
+ protected boolean hexString;
+
+ private static final int LINE_SEGMENT_SIZE = 256;
+
+ public PRTokeniser(String filename) throws IOException {
+ file = new RandomAccessFileOrArray(filename);
+ }
+
+ public PRTokeniser(byte pdfIn[]) {
+ file = new RandomAccessFileOrArray(pdfIn);
+ }
+
+ public PRTokeniser(RandomAccessFileOrArray file) {
+ this.file = file;
+ }
+
+ public void seek(int pos) throws IOException {
+ file.seek(pos);
+ }
+
+ public int getFilePointer() throws IOException {
+ return file.getFilePointer();
+ }
+
+ public void close() throws IOException {
+ file.close();
+ }
+
+ public int length() throws IOException {
+ return file.length();
+ }
+
+ public int read() throws IOException {
+ return file.read();
+ }
+
+ public RandomAccessFileOrArray getSafeFile() {
+ return new RandomAccessFileOrArray(file);
+ }
+
+ public RandomAccessFileOrArray getFile() {
+ return file;
+ }
+
+ public String readString(int size) throws IOException {
+ StringBuffer buf = new StringBuffer();
+ int ch;
+ while ((size--) > 0) {
+ ch = file.read();
+ if (ch == -1)
+ break;
+ buf.append((char)ch);
+ }
+ return buf.toString();
+ }
+
+ public static final boolean isWhitespace(int ch) {
+ return (ch == 0 || ch == 9 || ch == 10 || ch == 12 || ch == 13 || ch == 32);
+ }
+
+ public static final boolean isDelimiter(int ch) {
+ return (ch == '(' || ch == ')' || ch == '<' || ch == '>' || ch == '[' || ch == ']' || ch == '/' || ch == '%');
+ }
+
+ public static final boolean isDelimiterWhitespace(int ch) {
+ return delims[ch + 1];
+ }
+
+ public int getTokenType() {
+ return type;
+ }
+
+ public String getStringValue() {
+ return stringValue;
+ }
+
+ public int getReference() {
+ return reference;
+ }
+
+ public int getGeneration() {
+ return generation;
+ }
+
+ public void backOnePosition(int ch) throws IOException {
+ if (ch != -1)
+ file.pushBack((byte)ch);
+ }
+
+ public void throwError(String error) throws IOException {
+ throw new IOException(error + " at file pointer " + file.getFilePointer());
+ }
+
+ public char checkPdfHeader() throws IOException {
+ file.setStartOffset(0);
+ String str = readString(1024);
+ int idx = str.indexOf("%PDF-1.");
+ if (idx < 0)
+ throw new IOException("PDF header signature not found.");
+ file.setStartOffset(idx);
+ return str.charAt(idx + 7);
+ }
+
+ public void checkFdfHeader() throws IOException {
+ file.setStartOffset(0);
+ String str = readString(1024);
+ int idx = str.indexOf("%FDF-1.2");
+ if (idx < 0)
+ throw new IOException("FDF header signature not found.");
+ file.setStartOffset(idx);
+ }
+
+ public int getStartxref() throws IOException {
+ int size = Math.min(1024, file.length());
+ int pos = file.length() - size;
+ file.seek(pos);
+ String str = readString(1024);
+ int idx = str.lastIndexOf("startxref");
+ if (idx < 0)
+ throw new IOException("PDF startxref not found.");
+ return pos + idx;
+ }
+
+ public static int getHex(int v) {
+ if (v >= '0' && v <= '9')
+ return v - '0';
+ if (v >= 'A' && v <= 'F')
+ return v - 'A' + 10;
+ if (v >= 'a' && v <= 'f')
+ return v - 'a' + 10;
+ return -1;
+ }
+
+ public void nextValidToken() throws IOException {
+ int level = 0;
+ String n1 = null;
+ String n2 = null;
+ int ptr = 0;
+ while (nextToken()) {
+ if (type == TK_COMMENT)
+ continue;
+ switch (level) {
+ case 0:
+ {
+ if (type != TK_NUMBER)
+ return;
+ ptr = file.getFilePointer();
+ n1 = stringValue;
+ ++level;
+ break;
+ }
+ case 1:
+ {
+ if (type != TK_NUMBER) {
+ file.seek(ptr);
+ type = TK_NUMBER;
+ stringValue = n1;
+ return;
+ }
+ n2 = stringValue;
+ ++level;
+ break;
+ }
+ default:
+ {
+ if (type != TK_OTHER || !stringValue.equals("R")) {
+ file.seek(ptr);
+ type = TK_NUMBER;
+ stringValue = n1;
+ return;
+ }
+ type = TK_REF;
+ reference = Integer.parseInt(n1);
+ generation = Integer.parseInt(n2);
+ return;
+ }
+ }
+ }
+ throwError("Unexpected end of file");
+ }
+
+ public boolean nextToken() throws IOException {
+ StringBuffer outBuf = null;
+ stringValue = EMPTY;
+ int ch = 0;
+ do {
+ ch = file.read();
+ } while (ch != -1 && isWhitespace(ch));
+ if (ch == -1)
+ return false;
+ switch (ch) {
+ case '[':
+ type = TK_START_ARRAY;
+ break;
+ case ']':
+ type = TK_END_ARRAY;
+ break;
+ case '/':
+ {
+ outBuf = new StringBuffer();
+ type = TK_NAME;
+ while (true) {
+ ch = file.read();
+ if (delims[ch + 1])
+ break;
+ if (ch == '#') {
+ ch = (getHex(file.read()) << 4) + getHex(file.read());
+ }
+ outBuf.append((char)ch);
+ }
+ backOnePosition(ch);
+ break;
+ }
+ case '>':
+ ch = file.read();
+ if (ch != '>')
+ throwError("'>' not expected");
+ type = TK_END_DIC;
+ break;
+ case '<':
+ {
+ int v1 = file.read();
+ if (v1 == '<') {
+ type = TK_START_DIC;
+ break;
+ }
+ outBuf = new StringBuffer();
+ type = TK_STRING;
+ hexString = true;
+ int v2 = 0;
+ while (true) {
+ while (isWhitespace(v1))
+ v1 = file.read();
+ if (v1 == '>')
+ break;
+ v1 = getHex(v1);
+ if (v1 < 0)
+ break;
+ v2 = file.read();
+ while (isWhitespace(v2))
+ v2 = file.read();
+ if (v2 == '>') {
+ ch = v1 << 4;
+ outBuf.append((char)ch);
+ break;
+ }
+ v2 = getHex(v2);
+ if (v2 < 0)
+ break;
+ ch = (v1 << 4) + v2;
+ outBuf.append((char)ch);
+ v1 = file.read();
+ }
+ if (v1 < 0 || v2 < 0)
+ throwError("Error reading string");
+ break;
+ }
+ case '%':
+ type = TK_COMMENT;
+ do {
+ ch = file.read();
+ } while (ch != -1 && ch != '\r' && ch != '\n');
+ break;
+ case '(':
+ {
+ outBuf = new StringBuffer();
+ type = TK_STRING;
+ hexString = false;
+ int nesting = 0;
+ while (true) {
+ ch = file.read();
+ if (ch == -1)
+ break;
+ if (ch == '(') {
+ ++nesting;
+ }
+ else if (ch == ')') {
+ --nesting;
+ }
+ else if (ch == '\\') {
+ boolean lineBreak = false;
+ ch = file.read();
+ switch (ch) {
+ case 'n':
+ ch = '\n';
+ break;
+ case 'r':
+ ch = '\r';
+ break;
+ case 't':
+ ch = '\t';
+ break;
+ case 'b':
+ ch = '\b';
+ break;
+ case 'f':
+ ch = '\f';
+ break;
+ case '(':
+ case ')':
+ case '\\':
+ break;
+ case '\r':
+ lineBreak = true;
+ ch = file.read();
+ if (ch != '\n')
+ backOnePosition(ch);
+ break;
+ case '\n':
+ lineBreak = true;
+ break;
+ default:
+ {
+ if (ch < '0' || ch > '7') {
+ break;
+ }
+ int octal = ch - '0';
+ ch = file.read();
+ if (ch < '0' || ch > '7') {
+ backOnePosition(ch);
+ ch = octal;
+ break;
+ }
+ octal = (octal << 3) + ch - '0';
+ ch = file.read();
+ if (ch < '0' || ch > '7') {
+ backOnePosition(ch);
+ ch = octal;
+ break;
+ }
+ octal = (octal << 3) + ch - '0';
+ ch = octal & 0xff;
+ break;
+ }
+ }
+ if (lineBreak)
+ continue;
+ if (ch < 0)
+ break;
+ }
+ else if (ch == '\r') {
+ ch = file.read();
+ if (ch < 0)
+ break;
+ if (ch != '\n') {
+ backOnePosition(ch);
+ ch = '\n';
+ }
+ }
+ if (nesting == -1)
+ break;
+ outBuf.append((char)ch);
+ }
+ if (ch == -1)
+ throwError("Error reading string");
+ break;
+ }
+ default:
+ {
+ outBuf = new StringBuffer();
+ if (ch == '-' || ch == '+' || ch == '.' || (ch >= '0' && ch <= '9')) {
+ type = TK_NUMBER;
+ do {
+ outBuf.append((char)ch);
+ ch = file.read();
+ } while (ch != -1 && ((ch >= '0' && ch <= '9') || ch == '.'));
+ }
+ else {
+ type = TK_OTHER;
+ do {
+ outBuf.append((char)ch);
+ ch = file.read();
+ } while (!delims[ch + 1]);
+ }
+ backOnePosition(ch);
+ break;
+ }
+ }
+ if (outBuf != null)
+ stringValue = outBuf.toString();
+ return true;
+ }
+
+ public int intValue() {
+ return Integer.parseInt(stringValue);
+ }
+
+ public boolean readLineSegment(byte input[]) throws IOException {
+ int c = -1;
+ boolean eol = false;
+ int ptr = 0;
+ int len = input.length;
+ // ssteward, pdftk-1.10, 040922:
+ // skip initial whitespace; added this because PdfReader.rebuildXref()
+ // assumes that line provided by readLineSegment does not have init. whitespace;
+ if ( ptr < len ) {
+ while ( isWhitespace( (c = read()) ) );
+ }
+ while ( !eol && ptr < len ) {
+ switch (c) {
+ case -1:
+ case '\n':
+ eol = true;
+ break;
+ case '\r':
+ eol = true;
+ int cur = getFilePointer();
+ if ((read()) != '\n') {
+ seek(cur);
+ }
+ break;
+ default:
+ input[ptr++] = (byte)c;
+ break;
+ }
+
+ // break loop? do it before we read() again
+ if( eol || len <= ptr ) {
+ break;
+ }
+ else {
+ c = read();
+ }
+ }
+ if (ptr >= len) {
+ eol = false;
+ while (!eol) {
+ switch (c = read()) {
+ case -1:
+ case '\n':
+ eol = true;
+ break;
+ case '\r':
+ eol = true;
+ int cur = getFilePointer();
+ if ((read()) != '\n') {
+ seek(cur);
+ }
+ break;
+ }
+ }
+ }
+
+ if ((c == -1) && (ptr == 0)) {
+ return false;
+ }
+ if (ptr + 2 <= len) {
+ input[ptr++] = (byte)' ';
+ input[ptr] = (byte)'X';
+ }
+ return true;
+ }
+
+ public static int[] checkObjectStart(byte line[]) {
+ try {
+ PRTokeniser tk = new PRTokeniser(line);
+ int num = 0;
+ int gen = 0;
+ if (!tk.nextToken() || tk.getTokenType() != TK_NUMBER)
+ return null;
+ num = tk.intValue();
+ if (!tk.nextToken() || tk.getTokenType() != TK_NUMBER)
+ return null;
+ gen = tk.intValue();
+ if (!tk.nextToken())
+ return null;
+ if (!tk.getStringValue().equals("obj"))
+ return null;
+ return new int[]{num, gen};
+ }
+ catch (Exception ioe) {
+ // empty on purpose
+ }
+ return null;
+ }
+
+ public boolean isHexString() {
+ return this.hexString;
+ }
+
+}
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