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1 /*
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2 * Copyright 2000-2001 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.debugger;
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26
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27 import java.io.*;
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28
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29 /** InputLexer is the lexer through which the current set of debuggers
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30 see the debug server. It provides the ability to read all of the
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31 types the debuggers are interested in. All read operations are
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32 blocking. */
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33
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34 public class InputLexer {
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35 public InputLexer(BufferedInputStream in) throws IOException {
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36 this.in = in;
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37 pushedBack = false;
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38 }
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39
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40 public void close() throws IOException {
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41 in.close();
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42 }
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43
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44 /** Parses a boolean (really either a 0 or 1 integer in US-ASCII
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45 encoding) on the input stream */
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46 public boolean parseBoolean() throws IOException {
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47 int val = parseInt();
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48 return (val != 0);
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49 }
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50
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51 /** Parses an int in US-ASCII encoding on the input stream */
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52 public int parseInt() throws IOException {
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53 long l = parseLong();
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54 long mask = 0xFFFFFFFF00000000L;
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55 if ((l & mask) != 0) {
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56 throw new IOException("Overflow error reading int from debug server (read " + l + ")");
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57 }
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58 return (int) l;
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59 }
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60
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61 /** Parses a long in US-ASCII encoding on the input stream */
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62 public long parseLong() throws IOException {
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63 skipWhitespace();
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64 byte b = readByte();
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65 if (!Character.isDigit((char) b)) {
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66 error();
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67 }
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68 long l = 0;
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69 while (Character.isDigit((char) b)) {
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70 l *= 10;
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71 l += (b - '0');
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72 b = readByte();
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73 }
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74 pushBack(b);
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75 return l;
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76 }
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77
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78 /** Parses an address in the form 0x12345678 in US-ASCII encoding on
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79 the input stream */
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80 public long parseAddress() throws IOException {
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81 skipWhitespace();
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82 byte b;
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83 if ((b = readByte()) != '0') {
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84 error();
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85 }
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86 b = readByte();
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87 if (b != 'x') {
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88 error();
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89 }
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90 long val = 0;
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91 while (isHexDigit((char) (b = readByte()))) {
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92 val *= 16;
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93 val += Character.digit((char) b, 16);
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94 }
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95 pushBack(b);
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96 return val;
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97 }
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98
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99 public void skipByte() throws IOException {
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100 readByte();
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101 }
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102
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103 /** Reads binary data; one byte */
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104 public byte readByte() throws IOException {
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105 if (pushedBack) {
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106 pushedBack = false;
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107 return backBuf;
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108 }
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109 return readByteInternal();
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110 }
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111
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112 /** Reads a block of binary data in BLOCKING fashion */
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113 public void readBytes(byte[] buf, int off, int len) throws IOException {
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114 int startIdx = off;
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115 int numRead = 0;
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116 if (pushedBack) {
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117 buf[startIdx] = backBuf;
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118 pushedBack = false;
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119 ++startIdx;
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120 ++numRead;
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121 }
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122 while (numRead < len) {
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123 numRead += in.read(buf, startIdx + numRead, len - numRead);
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124 }
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125 // if (numRead != len) {
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126 // throw new IOException("Only read " + numRead + " out of " +
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127 // len + " bytes requested");
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128 // }
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129 }
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130
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131 /** Reads binary data; one 16-bit character in big-endian format */
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132 public char readChar() throws IOException {
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133 int hi = ((int) readByte()) & 0xFF;
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134 int lo = ((int) readByte()) & 0xFF;
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135 return (char) ((hi << 8) | lo);
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136 }
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137
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138 /** Reads binary data; one 32-bit unsigned int in big-endian format.
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139 Returned as a long. */
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140 public long readUnsignedInt() throws IOException {
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141 long b1 = ((long) readByte()) & 0xFF;
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142 long b2 = ((long) readByte()) & 0xFF;
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143 long b3 = ((long) readByte()) & 0xFF;
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144 long b4 = ((long) readByte()) & 0xFF;
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145
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146 return ((b1 << 24) | (b2 << 16) | (b3 << 8) | b4);
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147 }
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148
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149 /** Reads binary data; a US-ASCII string of the specified length */
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150 public String readByteString(int len) throws IOException {
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151 byte[] b = new byte[len];
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152 for (int i = 0; i < len; i++) {
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153 b[i] = readByte();
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154 }
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155 try {
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156 return new String(b, "US-ASCII");
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157 }
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158 catch (UnsupportedEncodingException e) {
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159 throw new IOException(e.toString());
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160 }
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161 }
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162
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163 /** Reads binary data; a Unicode string of the specified length */
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164 public String readCharString(int len) throws IOException {
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165 char[] c = new char[len];
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166 for (int i = 0; i < len; i++) {
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167 c[i] = readChar();
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168 }
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169 return new String(c);
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170 }
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171
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172 //----------------------------------------------------------------------
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173 // Internals only below this point
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174 //
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175
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176 private void skipWhitespace() throws IOException {
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177 byte b;
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178 while (Character.isWhitespace((char) (b = readByte()))) {
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179 }
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180 pushBack(b);
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181 }
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182
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183 private boolean isHexDigit(char c) {
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184 return (('0' <= c && c <= '9') ||
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185 ('a' <= c && c <= 'f') ||
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186 ('A' <= c && c <= 'F'));
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187 }
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188
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189 private void pushBack(byte b) {
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190 if (pushedBack) {
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191 throw new InternalError("Only one character pushback supported");
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192 }
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193 backBuf = b;
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194 pushedBack = true;
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195 }
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196
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197 private byte readByteInternal() throws IOException {
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198 int i = in.read();
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199 if (i == -1) {
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200 throw new IOException("End-of-file reached while reading from server");
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201 }
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202 return (byte) i;
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203 }
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204
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205 private void error() throws IOException {
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206 throw new IOException("Error parsing output of debug server");
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207 }
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208
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209 private BufferedInputStream in;
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210 private boolean pushedBack;
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211 private byte backBuf;
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212 }
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