/*
* 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.
*
*/
#include "precompiled.hpp"
#if !defined(_WINDOWS) && !defined(__APPLE__)
#include "memory/allocation.inline.hpp"
#include "runtime/os.hpp"
#include "utilities/elfStringTable.hpp"
// We will try to load whole string table into memory if we can.
// Otherwise, fallback to more expensive file operation.
ElfStringTable::ElfStringTable(FILE* file, Elf_Shdr shdr, int index) {
assert(file, "null file handle");
m_table = NULL;
m_index = index;
m_next = NULL;
m_file = file;
m_status = NullDecoder::no_error;
// try to load the string table
long cur_offset = ftell(file);
m_table = (char*)os::malloc(sizeof(char) * shdr.sh_size, mtInternal);
if (m_table != NULL) {
// if there is an error, mark the error
if (fseek(file, shdr.sh_offset, SEEK_SET) ||
fread((void*)m_table, shdr.sh_size, 1, file) != 1 ||
fseek(file, cur_offset, SEEK_SET)) {
m_status = NullDecoder::file_invalid;
os::free((void*)m_table);
m_table = NULL;
}
} else {
memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr));
}
}
ElfStringTable::~ElfStringTable() {
if (m_table != NULL) {
os::free((void*)m_table);
}
if (m_next != NULL) {
delete m_next;
}
}
bool ElfStringTable::string_at(int pos, char* buf, int buflen) {
if (NullDecoder::is_error(m_status)) {
return false;
}
if (m_table != NULL) {
jio_snprintf(buf, buflen, "%s", (const char*)(m_table + pos));
return true;
} else {
long cur_pos = ftell(m_file);
if (cur_pos == -1 ||
fseek(m_file, m_shdr.sh_offset + pos, SEEK_SET) ||
fread(buf, 1, buflen, m_file) <= 0 ||
fseek(m_file, cur_pos, SEEK_SET)) {
m_status = NullDecoder::file_invalid;
return false;
}
return true;
}
}
#endif // _WINDOWS