78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
/*
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* Copyright (c) 1997, 2018, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#if !defined(_WINDOWS) && !defined(__APPLE__)
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#include "jvm.h"
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#include "memory/allocation.inline.hpp"
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#include "runtime/os.hpp"
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#include "utilities/elfStringTable.hpp"
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// We will try to load whole string table into memory if we can.
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// Otherwise, fallback to more expensive file operation.
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ElfStringTable::ElfStringTable(FILE* const file, Elf_Shdr& shdr, int index) :
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_next(NULL), _index(index), _section(file, shdr), _fd(file) {
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_status = _section.status();
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}
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ElfStringTable::~ElfStringTable() {
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if (_next != NULL) {
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delete _next;
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}
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}
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bool ElfStringTable::string_at(size_t pos, char* buf, int buflen) {
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if (NullDecoder::is_error(get_status())) {
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return false;
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}
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assert(buflen > 0, "no buffer");
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if (pos >= _section.section_header()->sh_size) {
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return false;
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}
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const char* data = (const char*)_section.section_data();
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if (data != NULL) {
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jio_snprintf(buf, buflen, "%s", data + pos);
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return true;
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} else { // no cache data, read from file instead
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const Elf_Shdr* const shdr = _section.section_header();
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MarkedFileReader mfd(_fd);
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if (mfd.has_mark() &&
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mfd.set_position(shdr->sh_offset + pos) &&
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mfd.read((void*)buf, size_t(buflen))) {
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buf[buflen - 1] = '\0';
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return true;
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} else {
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// put it in error state to avoid retry
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_status = NullDecoder::file_invalid;
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return false;
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}
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}
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}
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#endif // !_WINDOWS && !__APPLE__
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