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1 /*
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2 * Copyright 1997-2005 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 // Input stream for reading .class file
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26 //
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27 // The entire input stream is present in a buffer allocated by the caller.
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28 // The caller is responsible for deallocating the buffer and for using
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29 // ResourceMarks appropriately when constructing streams.
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30
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31 class ClassFileStream: public ResourceObj {
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32 private:
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33 u1* _buffer_start; // Buffer bottom
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34 u1* _buffer_end; // Buffer top (one past last element)
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35 u1* _current; // Current buffer position
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36 char* _source; // Source of stream (directory name, ZIP/JAR archive name)
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37 bool _need_verify; // True if verification is on for the class file
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38
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39 void truncated_file_error(TRAPS);
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40 public:
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41 // Constructor
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42 ClassFileStream(u1* buffer, int length, char* source);
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43
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44 // Buffer access
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45 u1* buffer() const { return _buffer_start; }
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46 int length() const { return _buffer_end - _buffer_start; }
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47 u1* current() const { return _current; }
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48 void set_current(u1* pos) { _current = pos; }
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49 char* source() const { return _source; }
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50 void set_verify(bool flag) { _need_verify = flag; }
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51
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52 void check_truncated_file(bool b, TRAPS) {
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53 if (b) {
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54 truncated_file_error(THREAD);
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55 }
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56 }
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57
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58 void guarantee_more(int size, TRAPS) {
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59 size_t remaining = (size_t)(_buffer_end - _current);
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60 unsigned int usize = (unsigned int)size;
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61 check_truncated_file(usize > remaining, CHECK);
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62 }
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63
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64 // Read u1 from stream
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65 u1 get_u1(TRAPS);
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66 u1 get_u1_fast() {
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67 return *_current++;
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68 }
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69
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70 // Read u2 from stream
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71 u2 get_u2(TRAPS);
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72 u2 get_u2_fast() {
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73 u2 res = Bytes::get_Java_u2(_current);
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74 _current += 2;
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75 return res;
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76 }
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77
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78 // Read u4 from stream
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79 u4 get_u4(TRAPS);
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80 u4 get_u4_fast() {
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81 u4 res = Bytes::get_Java_u4(_current);
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82 _current += 4;
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83 return res;
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84 }
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85
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86 // Read u8 from stream
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87 u8 get_u8(TRAPS);
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88 u8 get_u8_fast() {
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89 u8 res = Bytes::get_Java_u8(_current);
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90 _current += 8;
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91 return res;
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92 }
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93
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94 // Get direct pointer into stream at current position.
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95 // Returns NULL if length elements are not remaining. The caller is
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96 // responsible for calling skip below if buffer contents is used.
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97 u1* get_u1_buffer() {
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98 return _current;
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99 }
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100
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101 u2* get_u2_buffer() {
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102 return (u2*) _current;
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103 }
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104
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105 // Skip length u1 or u2 elements from stream
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106 void skip_u1(int length, TRAPS);
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107 void skip_u1_fast(int length) {
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108 _current += length;
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109 }
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110
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111 void skip_u2(int length, TRAPS);
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112 void skip_u2_fast(int length) {
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113 _current += 2 * length;
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114 }
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115
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116 // Tells whether eos is reached
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117 bool at_eos() const { return _current == _buffer_end; }
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118 };
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