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hotspot/src/share/vm/classfile/classFileStream.cpp

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+/*
+ * Copyright 1997-2005 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+#include "incls/_precompiled.incl"
+#include "incls/_classFileStream.cpp.incl"
+
+void ClassFileStream::truncated_file_error(TRAPS) {
+  THROW_MSG(vmSymbols::java_lang_ClassFormatError(), "Truncated class file");
+}
+
+ClassFileStream::ClassFileStream(u1* buffer, int length, char* source) {
+  _buffer_start = buffer;
+  _buffer_end   = buffer + length;
+  _current      = buffer;
+  _source       = source;
+  _need_verify  = false;
+}
+
+u1 ClassFileStream::get_u1(TRAPS) {
+  if (_need_verify) {
+    guarantee_more(1, CHECK_0);
+  } else {
+    assert(1 <= _buffer_end - _current, "buffer overflow");
+  }
+  return *_current++;
+}
+
+u2 ClassFileStream::get_u2(TRAPS) {
+  if (_need_verify) {
+    guarantee_more(2, CHECK_0);
+  } else {
+    assert(2 <= _buffer_end - _current, "buffer overflow");
+  }
+  u1* tmp = _current;
+  _current += 2;
+  return Bytes::get_Java_u2(tmp);
+}
+
+u4 ClassFileStream::get_u4(TRAPS) {
+  if (_need_verify) {
+    guarantee_more(4, CHECK_0);
+  } else {
+    assert(4 <= _buffer_end - _current, "buffer overflow");
+  }
+  u1* tmp = _current;
+  _current += 4;
+  return Bytes::get_Java_u4(tmp);
+}
+
+u8 ClassFileStream::get_u8(TRAPS) {
+  if (_need_verify) {
+    guarantee_more(8, CHECK_0);
+  } else {
+    assert(8 <= _buffer_end - _current, "buffer overflow");
+  }
+  u1* tmp = _current;
+  _current += 8;
+  return Bytes::get_Java_u8(tmp);
+}
+
+void ClassFileStream::skip_u1(int length, TRAPS) {
+  if (_need_verify) {
+    guarantee_more(length, CHECK);
+  }
+  _current += length;
+}
+
+void ClassFileStream::skip_u2(int length, TRAPS) {
+  if (_need_verify) {
+    guarantee_more(length * 2, CHECK);
+  }
+  _current += length * 2;
+}