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sortix--sortix/sortix/initrd.cpp

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C++

/******************************************************************************
COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
This file is part of Sortix.
Sortix is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.
Sortix 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 for more
details.
You should have received a copy of the GNU General Public License along
with Sortix. If not, see <http://www.gnu.org/licenses/>.
initrd.cpp
Declares the structure of the Sortix ramdisk.
******************************************************************************/
#include "platform.h"
#include "initrd.h"
#include <libmaxsi/string.h>
#include "syscall.h"
#include "log.h" // DEBUG
using namespace Maxsi;
namespace Sortix
{
namespace InitRD
{
byte* initrd;
size_t initrdsize;
void SysPrintPathFiles()
{
Header* header = (Header*) initrd;
FileHeader* fhtbl = (FileHeader*) (initrd + sizeof(Header));
for ( uint32_t i = 0; i < header->numfiles; i++ )
{
FileHeader* fileheader = &(fhtbl[i]);
Log::PrintF("%s\n", fileheader->name);
}
}
void Init(byte* theinitrd, size_t size)
{
initrd = theinitrd;
initrdsize = size;
if ( size < sizeof(Header) ) { PanicF("initrd.cpp: initrd is too small"); }
Header* header = (Header*) initrd;
if ( String::Compare(header->magic, "sortix-initrd-1") != 0 ) { PanicF("initrd.cpp: invalid magic value in the initrd"); }
size_t sizeneeded = sizeof(Header) + header->numfiles * sizeof(FileHeader);
if ( size < sizeneeded ) { PanicF("initrd.cpp: initrd is too small"); }
// TODO: We need to do more validation here!
Syscall::Register(SYSCALL_PRINT_PATH_FILES, (void*) SysPrintPathFiles);
}
byte* Open(const char* filepath, size_t* size)
{
Header* header = (Header*) initrd;
FileHeader* fhtbl = (FileHeader*) (initrd + sizeof(Header));
for ( uint32_t i = 0; i < header->numfiles; i++ )
{
FileHeader* fileheader = &(fhtbl[i]);
if ( String::Compare(filepath, fileheader->name) != 0 ) { continue; }
*size = fileheader->size;
return initrd + fileheader->offset;
}
return NULL;
}
}
}