119 lines
3.6 KiB
C++
119 lines
3.6 KiB
C++
/*
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* Copyright 1997-2005 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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// Input stream for reading .class file
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//
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// The entire input stream is present in a buffer allocated by the caller.
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// The caller is responsible for deallocating the buffer and for using
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// ResourceMarks appropriately when constructing streams.
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class ClassFileStream: public ResourceObj {
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private:
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u1* _buffer_start; // Buffer bottom
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u1* _buffer_end; // Buffer top (one past last element)
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u1* _current; // Current buffer position
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char* _source; // Source of stream (directory name, ZIP/JAR archive name)
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bool _need_verify; // True if verification is on for the class file
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void truncated_file_error(TRAPS);
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public:
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// Constructor
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ClassFileStream(u1* buffer, int length, char* source);
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// Buffer access
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u1* buffer() const { return _buffer_start; }
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int length() const { return _buffer_end - _buffer_start; }
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u1* current() const { return _current; }
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void set_current(u1* pos) { _current = pos; }
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char* source() const { return _source; }
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void set_verify(bool flag) { _need_verify = flag; }
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void check_truncated_file(bool b, TRAPS) {
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if (b) {
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truncated_file_error(THREAD);
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}
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}
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void guarantee_more(int size, TRAPS) {
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size_t remaining = (size_t)(_buffer_end - _current);
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unsigned int usize = (unsigned int)size;
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check_truncated_file(usize > remaining, CHECK);
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}
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// Read u1 from stream
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u1 get_u1(TRAPS);
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u1 get_u1_fast() {
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return *_current++;
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}
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// Read u2 from stream
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u2 get_u2(TRAPS);
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u2 get_u2_fast() {
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u2 res = Bytes::get_Java_u2(_current);
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_current += 2;
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return res;
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}
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// Read u4 from stream
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u4 get_u4(TRAPS);
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u4 get_u4_fast() {
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u4 res = Bytes::get_Java_u4(_current);
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_current += 4;
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return res;
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}
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// Read u8 from stream
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u8 get_u8(TRAPS);
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u8 get_u8_fast() {
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u8 res = Bytes::get_Java_u8(_current);
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_current += 8;
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return res;
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}
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// Get direct pointer into stream at current position.
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// Returns NULL if length elements are not remaining. The caller is
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// responsible for calling skip below if buffer contents is used.
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u1* get_u1_buffer() {
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return _current;
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}
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u2* get_u2_buffer() {
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return (u2*) _current;
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}
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// Skip length u1 or u2 elements from stream
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void skip_u1(int length, TRAPS);
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void skip_u1_fast(int length) {
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_current += length;
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}
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void skip_u2(int length, TRAPS);
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void skip_u2_fast(int length) {
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_current += 2 * length;
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}
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// Tells whether eos is reached
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bool at_eos() const { return _current == _buffer_end; }
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};
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