aoqi@0: /*
aoqi@0:  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #include "precompiled.hpp"
aoqi@0: 
aoqi@0: #if !defined(_WINDOWS) && !defined(__APPLE__)
aoqi@0: 
aoqi@0: #include "memory/allocation.inline.hpp"
aoqi@0: #include "runtime/os.hpp"
aoqi@0: #include "utilities/elfStringTable.hpp"
aoqi@0: 
aoqi@0: // We will try to load whole string table into memory if we can.
aoqi@0: // Otherwise, fallback to more expensive file operation.
aoqi@0: ElfStringTable::ElfStringTable(FILE* file, Elf_Shdr shdr, int index) {
aoqi@0:   assert(file, "null file handle");
aoqi@0:   m_table = NULL;
aoqi@0:   m_index = index;
aoqi@0:   m_next = NULL;
aoqi@0:   m_file = file;
aoqi@0:   m_status = NullDecoder::no_error;
aoqi@0: 
aoqi@0:   // try to load the string table
aoqi@0:   long cur_offset = ftell(file);
aoqi@0:   m_table = (char*)os::malloc(sizeof(char) * shdr.sh_size, mtInternal);
aoqi@0:   if (m_table != NULL) {
aoqi@0:     // if there is an error, mark the error
aoqi@0:     if (fseek(file, shdr.sh_offset, SEEK_SET) ||
aoqi@0:       fread((void*)m_table, shdr.sh_size, 1, file) != 1 ||
aoqi@0:       fseek(file, cur_offset, SEEK_SET)) {
aoqi@0:       m_status = NullDecoder::file_invalid;
aoqi@0:       os::free((void*)m_table);
aoqi@0:       m_table = NULL;
aoqi@0:     }
aoqi@0:   } else {
aoqi@0:     memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr));
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: ElfStringTable::~ElfStringTable() {
aoqi@0:   if (m_table != NULL) {
aoqi@0:     os::free((void*)m_table);
aoqi@0:   }
aoqi@0: 
aoqi@0:   if (m_next != NULL) {
aoqi@0:     delete m_next;
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: bool ElfStringTable::string_at(int pos, char* buf, int buflen) {
aoqi@0:   if (NullDecoder::is_error(m_status)) {
aoqi@0:     return false;
aoqi@0:   }
aoqi@0:   if (m_table != NULL) {
aoqi@0:     jio_snprintf(buf, buflen, "%s", (const char*)(m_table + pos));
aoqi@0:     return true;
aoqi@0:   } else {
aoqi@0:     long cur_pos = ftell(m_file);
aoqi@0:     if (cur_pos == -1 ||
aoqi@0:       fseek(m_file, m_shdr.sh_offset + pos, SEEK_SET) ||
aoqi@0:       fread(buf, 1, buflen, m_file) <= 0 ||
aoqi@0:       fseek(m_file, cur_pos, SEEK_SET)) {
aoqi@0:       m_status = NullDecoder::file_invalid;
aoqi@0:       return false;
aoqi@0:     }
aoqi@0:     return true;
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: #endif // !_WINDOWS && !__APPLE__