56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
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#include "initrd.h"
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// Declare various things
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initrd_header_t *initrd_header; // Header
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initrd_file_header_t *file_header; // List of headers
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fs_node_t *initrd_root; // Directory root node
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fs_node_t *initrd_dev; // Directory dev node(/dev)
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fs_node_t *root_nodes; // List of file nodes
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uint32_t nroot_nodes;
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struct dirent dirent;
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fs_node_t *init_ramdisk(uint32_t multiboot_location) {
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// Initialize main and file headers
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initrd_header = (initrd_header_t*)multiboot_location;
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file_header = (initrd_file_header_t*)(multiboot_location+sizeof(initrd_header_t));
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// Initialize root directory
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initrd_root = (fs_node_t*)
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}
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static uint32_t initrd_read(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer) {
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initrd_file_header_t header = file_header[node->inode];
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if(offset > header.length)
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return 0;
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if(offset+size > header.length)
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size = header.length-offset;
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memcpy(buffer, (uint8_t*) (header.offset+offset), size);
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return size;
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}
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static struct dirent *initrd_readdir(fs_node_t *node, uint32_t index) {
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if(node == initrd_root && index == 0) {
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strcpy(dirent.name, "dev");
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dirent.name[3] = 0; // Add null terminator to the string
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dirent.ino = 0;
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return &dirent;
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}
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if(index-1 >= &root_nodes)
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return 0;
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strcpy(dirent.name, root_nodes[index-1].name);
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dirent.name[strlen(root_nodes[index-1].name)] = 0; // Add null terminator
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dirent.ino = root_nodes[index-1].inode;
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return &dirent;
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}
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static fs_node_t *initrd_finddir(fs_node_t *node, uint8_t *name) {
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if(node == initrd_root && !strcmp(name, "dev"))
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return initrd_dev;
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for(uint32_t i = 0; i < nroot_nodes; i++)
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if(!strcmp(name, root_nodes[i].name))
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return &root_nodes[i];
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return 0;
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}
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