bool SELFDecrypter::MakeElf(const std::string& elf, bool isElf32)
{
// Create a new ELF file.
fs::file e(elf, o_write | o_create | o_trunc);
if(!e)
{
LOG_ERROR(LOADER, "Could not create ELF file! (%s)", elf.c_str());
return false;
}
// Set initial offset.
u32 data_buf_offset = 0;
if (isElf32)
{
// Write ELF header.
WriteEhdr(e, elf32_hdr);
// Write program headers.
for(u32 i = 0; i < elf32_hdr.e_phnum; ++i)
WritePhdr(e, phdr32_arr[i]);
for (unsigned int i = 0; i < meta_hdr.section_count; i++)
{
// PHDR type.
if (meta_shdr[i].type == 2)
{
// Seek to the program header data offset and write the data.
e.seek(phdr32_arr[meta_shdr[i].program_idx].p_offset);
e.write(data_buf + data_buf_offset, meta_shdr[i].data_size);
// Advance the data buffer offset by data size.
data_buf_offset += meta_shdr[i].data_size;
}
}
// Write section headers.
if(self_hdr.se_shdroff != 0)
{
e.seek(elf32_hdr.e_shoff);
for(u32 i = 0; i < elf32_hdr.e_shnum; ++i)
WriteShdr(e, shdr32_arr[i]);
}
}
else
{
// Write ELF header.
WriteEhdr(e, elf64_hdr);
// Write program headers.
for(u32 i = 0; i < elf64_hdr.e_phnum; ++i)
WritePhdr(e, phdr64_arr[i]);
// Write data.
for (unsigned int i = 0; i < meta_hdr.section_count; i++)
{
// PHDR type.
if (meta_shdr[i].type == 2)
{
// Decompress if necessary.
if (meta_shdr[i].compressed == 2)
{
// Allocate a buffer for decompression.
u8 *decomp_buf = (u8 *)malloc(phdr64_arr[meta_shdr[i].program_idx].p_filesz);
// Set up memory streams for input/output.
wxMemoryInputStream decomp_stream_in(data_buf + data_buf_offset, meta_shdr[i].data_size);
wxMemoryOutputStream decomp_stream_out;
// Create a Zlib stream, read the data and flush the stream.
wxZlibInputStream* z_stream = new wxZlibInputStream(decomp_stream_in);
z_stream->Read(decomp_stream_out);
delete z_stream;
// Copy the decompressed result from the stream.
decomp_stream_out.CopyTo(decomp_buf, phdr64_arr[meta_shdr[i].program_idx].p_filesz);
// Seek to the program header data offset and write the data.
e.seek(phdr64_arr[meta_shdr[i].program_idx].p_offset);
e.write(decomp_buf, phdr64_arr[meta_shdr[i].program_idx].p_filesz);
// Release the decompression buffer.
free(decomp_buf);
}
else
{
// Seek to the program header data offset and write the data.
e.seek(phdr64_arr[meta_shdr[i].program_idx].p_offset);
e.write(data_buf + data_buf_offset, meta_shdr[i].data_size);
}
// Advance the data buffer offset by data size.
data_buf_offset += meta_shdr[i].data_size;
}
}
// Write section headers.
if(self_hdr.se_shdroff != 0)
{
e.seek(elf64_hdr.e_shoff);
for(u32 i = 0; i < elf64_hdr.e_shnum; ++i)
WriteShdr(e, shdr64_arr[i]);
}
}
return true;
}
bool SELFDecrypter::MakeElf(const std::string& elf, bool isElf32)
{
// Create a new ELF file.
fs::file e(elf, fs::rewrite);
if(!e)
{
LOG_ERROR(LOADER, "Could not create ELF file! (%s)", elf.c_str());
return false;
}
// Set initial offset.
u32 data_buf_offset = 0;
if (isElf32)
{
// Write ELF header.
WriteEhdr(e, elf32_hdr);
// Write program headers.
for (u32 i = 0; i < elf32_hdr.e_phnum; ++i)
{
WritePhdr(e, phdr32_arr[i]);
}
for (unsigned int i = 0; i < meta_hdr.section_count; i++)
{
// PHDR type.
if (meta_shdr[i].type == 2)
{
// Seek to the program header data offset and write the data.
e.seek(phdr32_arr[meta_shdr[i].program_idx].p_offset);
e.write(data_buf + data_buf_offset, meta_shdr[i].data_size);
// Advance the data buffer offset by data size.
data_buf_offset += meta_shdr[i].data_size;
}
}
// Write section headers.
if (self_hdr.se_shdroff != 0)
{
e.seek(elf32_hdr.e_shoff);
for (u32 i = 0; i < elf32_hdr.e_shnum; ++i)
{
WriteShdr(e, shdr32_arr[i]);
}
}
}
else
{
// Write ELF header.
WriteEhdr(e, elf64_hdr);
// Write program headers.
for (u32 i = 0; i < elf64_hdr.e_phnum; ++i)
{
WritePhdr(e, phdr64_arr[i]);
}
// Write data.
for (unsigned int i = 0; i < meta_hdr.section_count; i++)
{
// PHDR type.
if (meta_shdr[i].type == 2)
{
// Decompress if necessary.
if (meta_shdr[i].compressed == 2)
{
/// Removed all wxWidget dependent code. Replaced with zlib functions.
/// Also changed local mallocs to unique_ptrs.
// Store the length in writeable memory space.
std::unique_ptr<uLongf> decomp_buf_length(new uLongf);
memcpy(decomp_buf_length.get(), &phdr64_arr[meta_shdr[i].program_idx].p_filesz, sizeof(uLongf));
/// Create a pointer to a buffer for decompression.
std::unique_ptr<u8[]> decomp_buf(new u8[phdr64_arr[meta_shdr[i].program_idx].p_filesz]);
// Create a buffer separate from data_buf to uncompress.
std::unique_ptr<u8[]> zlib_buf(new u8[data_buf_length]);
memcpy(zlib_buf.get(), data_buf, data_buf_length);
// Use zlib uncompress on the new buffer.
// decomp_buf_length changes inside the call to uncompress, so it must be a pointer to correct type (in writeable mem space).
int rv = uncompress(decomp_buf.get(), decomp_buf_length.get(), zlib_buf.get() + data_buf_offset, data_buf_length);
// Check for errors (TODO: Probably safe to remove this once these changes have passed testing.)
switch (rv)
{
case Z_MEM_ERROR: LOG_ERROR(LOADER, "MakeELF encountered a Z_MEM_ERROR!"); break;
case Z_BUF_ERROR: LOG_ERROR(LOADER, "MakeELF encountered a Z_BUF_ERROR!"); break;
case Z_DATA_ERROR: LOG_ERROR(LOADER, "MakeELF encountered a Z_DATA_ERROR!"); break;
default: break;
}
// Seek to the program header data offset and write the data.
e.seek(phdr64_arr[meta_shdr[i].program_idx].p_offset);
e.write(decomp_buf.get(), phdr64_arr[meta_shdr[i].program_idx].p_filesz);
}
else
{
// Seek to the program header data offset and write the data.
e.seek(phdr64_arr[meta_shdr[i].program_idx].p_offset);
e.write(data_buf + data_buf_offset, meta_shdr[i].data_size);
}
// Advance the data buffer offset by data size.
data_buf_offset += meta_shdr[i].data_size;
}
}
// Write section headers.
if (self_hdr.se_shdroff != 0)
{
e.seek(elf64_hdr.e_shoff);
for (u32 i = 0; i < elf64_hdr.e_shnum; ++i)
{
WriteShdr(e, shdr64_arr[i]);
}
}
}
return true;
}
