From 55365e593c27b57c50a7369597bd14f110ba8cb6 Mon Sep 17 00:00:00 2001
From: Michal Idziorek <m.i@gmx.at>
Date: Wed, 22 Oct 2014 21:21:32 +0200
Subject: reading userprogramm from ext2 ramimage!

---
 fs/ext2.c | 143 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 141 insertions(+), 2 deletions(-)

(limited to 'fs/ext2.c')

diff --git a/fs/ext2.c b/fs/ext2.c
index bc83f55..bdfb80b 100644
--- a/fs/ext2.c
+++ b/fs/ext2.c
@@ -1,7 +1,10 @@
 // ext2 minidriver
 // based on osdev wiki article: http://wiki.osdev.org/Ext2
 
+#define FOOLOS_MODULE_NAME "ext2"
+
 #include "lib/int/stdint.h"
+#include "lib/logger/log.h"
 
 typedef struct ext2_superblock_struct
 {
@@ -95,13 +98,149 @@ typedef struct ext2_inode_struct
 }ext2_inode;
 
 
+void ram_read(char *in,char *out,int size, int count)
+{
+    for(int i=0;i<size*count;i++)
+    {
+	out[i]=in[i];
+    }
 
-    /*
-int main()
+}
+
+int ext2_check(uint8_t *ram)
 {
     ext2_superblock super;
     ext2_superblock_ext super_ext;
+    uint8_t *ptr=ram+1024;
+    ram_read(ptr,&super,sizeof(super),1);
+    if(super.ext2_sig!=0xef53)log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"no ext2 signature found, where ram-image expected!");
+    //check version and req features.
+    //
+}
+
+ext2_inode ext2_get_inode(uint8_t *ram,int inode_num)
+{
+
+    // get basic shit from superblock!
+    ext2_superblock super;
+    ext2_blockgroup_desc desc;
+    ext2_inode inode;
+
+    uint8_t *ptr=ram+1024;
+    ram_read(ptr,&super,sizeof(super),1);
+    if(super.ext2_sig!=0xef53)log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"no ext2 signature found, where ram-image expected!");
+
+    int block_group=(inode_num-1)/super.inodes_per_group;
+
+    // get descrtptor for our blockgroup!
+    //TODO: only correct for 1024bytes/block. read more than one!!!
+    int block_size=1024;
+    int descriptor_start_block=2;
+
+    ptr=ram+block_size*descriptor_start_block;
+    ptr+=sizeof(desc)*block_group; // skip to our descriptor;
+
+    ram_read(ptr,&desc,sizeof(desc),1); // read descriptor
+
+    // read our inode;
+    ptr=ram+block_size*desc.addr_inode_table;
+    ptr+=128*((inode_num-1)%super.inodes_per_group);
+
+    ram_read(ptr,&inode,sizeof(inode),1); //get inode 2 (rood-directory)
+
+    return inode;
+
+}
+
+
+int ext2_inode_content(char *ram,int inode_nr,uint8_t *ramdest,int max)
+{
+    ext2_inode inode=ext2_get_inode(ram,inode_nr);
+
+    int pos=0;
+    int block=0;
+    int block_size=1024;
+    int block_counter=0;
+    uint8_t *ptr=ram+block_size*inode.direct_pointer[0]; 
+
+    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"Loading %d %d bytes",inode.size_high, inode.size_low);
+    while(pos<inode.size_low) // use size high?
+    {
+	ramdest[pos]=*ptr;
 
+	ptr++;
+	block_counter++;
+	pos++;
+	if(block_counter>=block_size)
+	{
+	    block++;
+
+	    if(block>=12)
+	    {
+		int indirect_block=block-12;
+		uint32_t *indirect_ptr=ram+block_size*inode.indirect1;
+	  	ptr=ram+block_size*indirect_ptr[indirect_block]; 
+
+	    }
+	    else
+	    {
+	  	    ptr=ram+block_size*inode.direct_pointer[block]; 
+	    }
+
+	    block_counter=0;
+	}
+
+	
+
+    }
+//  if(block>=12)panic(FOOLOS_MODULE_NAME,"such big files unsupported yet");
+
+
+}
+
+
+
+int ext2_read_root_dir(uint8_t *ram)
+{
+   
+    ext2_inode inode=ext2_get_inode(ram,2);
+
+    char buf[256];
+    int block_size=1024;
+    uint8_t *ptr=ram+block_size*inode.direct_pointer[0]; //use other pointers in future!
+
+    int pos=0;
+    while(pos<inode.size_low) // use size high?
+    {
+
+	ext2_dir dir;
+	ram_read(ptr,&dir,sizeof(dir),1);
+	ptr+=sizeof(dir);
+
+	/*
+	printf("inode: %i\n",dir.inode);
+	printf("total size: %i\n",dir.size);
+	printf("length low/high: %i/%i\n\n",dir.name_length_low,dir.name_length_high);
+	*/
+
+//	int l=fread(buf,sizeof(char),dir.name_length_low,stdin);
+	ram_read(ptr,&buf,sizeof(char),dir.name_length_low); 
+	ptr+=dir.name_length_low;
+	
+	buf[dir.name_length_low]=0;
+	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"%d %s",dir.inode,buf);
+	ptr+=dir.size-8-dir.name_length_low;
+	pos+=dir.size;
+
+    }
+
+}
+
+/*
+int main()
+{
+    ext2_superblock super;
+    ext2_superblock_ext super_ext;
 
     printf("ext2 fools driver\n");
     printf("reading superblock...\n\n");
-- 
cgit v1.2.3