14c7f45cda
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18010 a1c6a512-1295-4272-9138-f99709370657
387 lines
9.4 KiB
C++
Executable file
387 lines
9.4 KiB
C++
Executable file
/* zenutils - Utilities for working with creative firmwares.
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* Copyright 2007 (c) Rasmus Ry <rasmus.ry{at}gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "firmware.h"
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#include <iostream>
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#include <stdexcept>
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zen::firmware_entry::firmware_entry(bool big_endian)
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: _big_endian(big_endian)
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{
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}
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zen::firmware_entry::firmware_entry(const firmware_entry& copy)
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{
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assign(copy);
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}
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zen::firmware_entry& zen::firmware_entry::operator=(const firmware_entry& right)
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{
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assign(right);
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return *this;
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}
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bool zen::firmware_entry::read(std::istream& is)
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{
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// Read the header.
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is.read((char*)&_header, sizeof(firmware_header_t));
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if (!is.good())
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return false;
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// If the firmware is big-endian, swap the header values to little-endian.
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if (_big_endian)
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{
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_header.tag = shared::swap(_header.tag);
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if (_header.tag != 'NULL')
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{
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_header.size = shared::swap(_header.size);
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}
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}
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// Resize the bytes buffer to the size specified in the header.
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_bytes.resize(_header.size);
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// Read the entry contents.
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is.read(reinterpret_cast<char*>(&_bytes[0]),
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_header.size);
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return is.good();
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}
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bool zen::firmware_entry::write(std::ostream& os) const
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{
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// Form a header using the current size of the bytes buffer.
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firmware_header_t header = {
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_header.tag,
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static_cast<dword>(_bytes.size())
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};
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// If the firmware is big-endian, swap the header values back into big-endian.
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if (_big_endian)
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{
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if (header.tag != 'NULL')
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{
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header.size = shared::swap(header.size);
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}
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header.tag = shared::swap(header.tag);
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}
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// Write the header.
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os.write((const char*)&header, sizeof(firmware_header_t));
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if (!os.good())
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return false;
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// Write the entry contents.
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os.write(reinterpret_cast<const char*>(&_bytes[0]),
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static_cast<std::streamsize>(_bytes.size()));
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return os.good();
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}
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bool zen::firmware_entry::is_big_endian() const
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{
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return _big_endian;
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}
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const zen::firmware_header_t& zen::firmware_entry::get_header() const
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{
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return _header;
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}
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zen::firmware_header_t& zen::firmware_entry::get_header()
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{
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return _header;
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}
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const shared::bytes& zen::firmware_entry::get_bytes() const
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{
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return _bytes;
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}
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shared::bytes& zen::firmware_entry::get_bytes()
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{
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return _bytes;
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}
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std::string zen::firmware_entry::get_name() const
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{
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char name[5];
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*(dword*)name = shared::swap(_header.tag);
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name[4] = '\0';
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// Determine if all characters in the tag are printable.
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bool isprintable = true;
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for (int i = 0; i < 4; i++)
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{
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if (!isprint((byte)name[i]))
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{
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isprintable = false;
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break;
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}
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}
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// If they are, simply return the tag as a string.
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if (isprintable)
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{
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return std::string(name);
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}
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// Otherwise, encode the tag into a hexadecimal string.
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char buffer[11];
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sprintf(buffer, "0x%08x", _header.tag);
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return std::string(buffer);
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}
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std::string zen::firmware_entry::get_content_name() const
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{
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std::string name = get_name();
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if (name == "DATA")
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{
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name = "";
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int nameoff = is_big_endian() ? 1 : 0;
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for (int i = 0; i < 16; i++)
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{
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char c = get_bytes()[i * 2 + nameoff];
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if (!c)
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break;
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name += c;
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}
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}
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else if (name == "EXT0")
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{
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name = "";
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int nameoff = is_big_endian() ? 1 : 0;
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for (int i = 0; i < 12; i++)
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{
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char c = get_bytes()[i * 2 + nameoff];
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if (!c)
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break;
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name += c;
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}
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}
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return name;
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}
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size_t zen::firmware_entry::get_content_offset() const
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{
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std::string name = get_name();
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if (name == "DATA")
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{
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return 32;
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}
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else if (name == "EXT0")
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{
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return 24;
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}
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return 0;
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}
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size_t zen::firmware_entry::calc_size() const
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{
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return _bytes.size() + sizeof(firmware_header_t);
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}
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void zen::firmware_entry::assign(const firmware_entry& copy)
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{
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_big_endian = copy._big_endian;
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_header.tag = copy._header.tag;
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_header.size = copy._header.size;
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_bytes.assign(copy._bytes.begin(), copy._bytes.end());
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}
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zen::firmware_archive::firmware_archive(bool big_endian)
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: _big_endian(big_endian)
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{
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}
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zen::firmware_archive::firmware_archive(const firmware_archive& copy)
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{
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assign(copy);
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}
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zen::firmware_archive& zen::firmware_archive::operator=(const firmware_archive& right)
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{
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assign(right);
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return *this;
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}
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bool zen::firmware_archive::read(std::istream& is)
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{
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// Read the root entry's header.
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firmware_header_t root;
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is.read((char*)&root, sizeof(firmware_header_t));
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if (!is.good())
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return false;
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if ((root.tag != 'CIFF') && (root.tag != 'FFIC'))
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{
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throw std::runtime_error("Invalid firmware archive format!");
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}
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_big_endian = root.tag == 'FFIC' ? true : false;
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if (_big_endian)
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{
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root.tag = shared::swap(root.tag);
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root.size = shared::swap(root.size);
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}
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// Save the current stream position.
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std::istream::pos_type endpos = is.tellg();
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std::istream::pos_type curpos = endpos;
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endpos += std::istream::pos_type(root.size);
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// Read untill the end of the root entry contents.
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while (curpos < endpos)
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{
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firmware_entry entry(_big_endian);
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if (!entry.read(is))
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return false;
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_children.push_back(entry);
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curpos = is.tellg();
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}
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curpos = is.tellg();
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is.seekg(0, std::ios::end);
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endpos = is.tellg();
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is.seekg(curpos);
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// Read untill the end of the file.
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while (((size_t)curpos + sizeof(firmware_header_t)) < endpos)
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{
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firmware_entry entry(_big_endian);
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if (!entry.read(is))
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return false;
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_neighbours.push_back(entry);
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curpos = is.tellg();
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}
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return true;
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}
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bool zen::firmware_archive::write(std::ostream& os) const
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{
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// Read the root entry's header.
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firmware_header_t root = {'CIFF', 0};
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// Calculate the total size of all the children entries.
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for (firmware_entries::const_iterator i = _children.begin();
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i != _children.end(); ++i)
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{
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root.size += i->calc_size();
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}
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// If the firmware is big-endian, swap the header values back into big-endian.
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if (_big_endian)
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{
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root.tag = shared::swap(root.tag);
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root.size = shared::swap(root.size);
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}
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// Write the header.
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os.write((const char*)&root, sizeof(firmware_header_t));
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if (!os.good())
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return false;
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// Write all the child entries.
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for (firmware_entries::const_iterator i = _children.begin();
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i != _children.end(); ++i)
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{
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if (!i->write(os))
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return false;
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}
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// Write all the neighbour entries.
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for (firmware_entries::const_iterator i = _neighbours.begin();
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i != _neighbours.end(); ++i)
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{
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if (!i->write(os))
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return false;
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}
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return true;
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}
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bool zen::firmware_archive::is_big_endian() const
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{
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return _big_endian;
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}
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const zen::firmware_entries& zen::firmware_archive::get_children() const
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{
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return _children;
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}
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zen::firmware_entries& zen::firmware_archive::get_children()
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{
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return _children;
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}
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const zen::firmware_entries& zen::firmware_archive::get_neighbours() const
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{
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return _neighbours;
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}
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zen::firmware_entries& zen::firmware_archive::get_neighbours()
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{
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return _neighbours;
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}
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bool zen::firmware_archive::is_signed() const
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{
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for (firmware_entries::const_iterator i = _neighbours.begin();
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i != _neighbours.end(); i++)
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{
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if (i->get_name() == "NULL")
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return true;
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}
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return false;
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}
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size_t zen::firmware_archive::calc_size() const
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{
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size_t size = sizeof(firmware_header_t);
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for (firmware_entries::const_iterator i = _children.begin();
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i != _children.end(); i++)
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{
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size += i->calc_size();
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}
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for (firmware_entries::const_iterator i = _neighbours.begin();
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i != _neighbours.end(); i++)
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{
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size += i->calc_size();
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}
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return size;
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}
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void zen::firmware_archive::assign(const firmware_archive& copy)
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{
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_big_endian = copy._big_endian;
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_children.assign(copy._children.begin(), copy._children.end());
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_neighbours.assign(copy._neighbours.begin(), copy._neighbours.end());
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}
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