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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 #include "incls/_precompiled.incl"
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26 #include "incls/_classFileStream.cpp.incl"
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27
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28 void ClassFileStream::truncated_file_error(TRAPS) {
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29 THROW_MSG(vmSymbols::java_lang_ClassFormatError(), "Truncated class file");
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30 }
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31
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32 ClassFileStream::ClassFileStream(u1* buffer, int length, char* source) {
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33 _buffer_start = buffer;
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34 _buffer_end = buffer + length;
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35 _current = buffer;
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36 _source = source;
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37 _need_verify = false;
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38 }
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39
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40 u1 ClassFileStream::get_u1(TRAPS) {
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41 if (_need_verify) {
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42 guarantee_more(1, CHECK_0);
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43 } else {
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44 assert(1 <= _buffer_end - _current, "buffer overflow");
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45 }
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46 return *_current++;
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47 }
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48
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49 u2 ClassFileStream::get_u2(TRAPS) {
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50 if (_need_verify) {
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51 guarantee_more(2, CHECK_0);
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52 } else {
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53 assert(2 <= _buffer_end - _current, "buffer overflow");
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54 }
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55 u1* tmp = _current;
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56 _current += 2;
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57 return Bytes::get_Java_u2(tmp);
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58 }
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59
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60 u4 ClassFileStream::get_u4(TRAPS) {
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61 if (_need_verify) {
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62 guarantee_more(4, CHECK_0);
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63 } else {
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64 assert(4 <= _buffer_end - _current, "buffer overflow");
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65 }
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66 u1* tmp = _current;
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67 _current += 4;
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68 return Bytes::get_Java_u4(tmp);
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69 }
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70
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71 u8 ClassFileStream::get_u8(TRAPS) {
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72 if (_need_verify) {
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73 guarantee_more(8, CHECK_0);
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74 } else {
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75 assert(8 <= _buffer_end - _current, "buffer overflow");
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76 }
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77 u1* tmp = _current;
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78 _current += 8;
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79 return Bytes::get_Java_u8(tmp);
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80 }
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81
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82 void ClassFileStream::skip_u1(int length, TRAPS) {
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83 if (_need_verify) {
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84 guarantee_more(length, CHECK);
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85 }
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86 _current += length;
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87 }
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88
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89 void ClassFileStream::skip_u2(int length, TRAPS) {
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90 if (_need_verify) {
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91 guarantee_more(length * 2, CHECK);
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92 }
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93 _current += length * 2;
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94 }
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