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/*
* Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#ifndef SHARE_VM_CLASSFILE_CLASSFILESTREAM_HPP
#define SHARE_VM_CLASSFILE_CLASSFILESTREAM_HPP
#include "utilities/top.hpp"
#ifdef TARGET_ARCH_x86
# include "bytes_x86.hpp"
#endif
#ifdef TARGET_ARCH_sparc
# include "bytes_sparc.hpp"
#endif
#ifdef TARGET_ARCH_zero
# include "bytes_zero.hpp"
#endif
// Input stream for reading .class file
//
// The entire input stream is present in a buffer allocated by the caller.
// The caller is responsible for deallocating the buffer and for using
// ResourceMarks appropriately when constructing streams.
class ClassFileStream: public ResourceObj {
private:
u1* _buffer_start; // Buffer bottom
u1* _buffer_end; // Buffer top (one past last element)
u1* _current; // Current buffer position
char* _source; // Source of stream (directory name, ZIP/JAR archive name)
bool _need_verify; // True if verification is on for the class file
void truncated_file_error(TRAPS);
public:
// Constructor
ClassFileStream(u1* buffer, int length, char* source);
// Buffer access
u1* buffer() const { return _buffer_start; }
int length() const { return _buffer_end - _buffer_start; }
u1* current() const { return _current; }
void set_current(u1* pos) { _current = pos; }
char* source() const { return _source; }
void set_verify(bool flag) { _need_verify = flag; }
void check_truncated_file(bool b, TRAPS) {
if (b) {
truncated_file_error(THREAD);
}
}
void guarantee_more(int size, TRAPS) {
size_t remaining = (size_t)(_buffer_end - _current);
unsigned int usize = (unsigned int)size;
check_truncated_file(usize > remaining, CHECK);
}
// Read u1 from stream
u1 get_u1(TRAPS);
u1 get_u1_fast() {
return *_current++;
}
// Read u2 from stream
u2 get_u2(TRAPS);
u2 get_u2_fast() {
u2 res = Bytes::get_Java_u2(_current);
_current += 2;
return res;
}
// Read u4 from stream
u4 get_u4(TRAPS);
u4 get_u4_fast() {
u4 res = Bytes::get_Java_u4(_current);
_current += 4;
return res;
}
// Read u8 from stream
u8 get_u8(TRAPS);
u8 get_u8_fast() {
u8 res = Bytes::get_Java_u8(_current);
_current += 8;
return res;
}
// Get direct pointer into stream at current position.
// Returns NULL if length elements are not remaining. The caller is
// responsible for calling skip below if buffer contents is used.
u1* get_u1_buffer() {
return _current;
}
u2* get_u2_buffer() {
return (u2*) _current;
}
// Skip length u1 or u2 elements from stream
void skip_u1(int length, TRAPS);
void skip_u1_fast(int length) {
_current += length;
}
void skip_u2(int length, TRAPS);
void skip_u2_fast(int length) {
_current += 2 * length;
}
// Tells whether eos is reached
bool at_eos() const { return _current == _buffer_end; }
};
#endif // SHARE_VM_CLASSFILE_CLASSFILESTREAM_HPP
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