forked from PoliEcho-holding-org/kern
Tom-on
e9abfc2e4a
- Minor makefile chnages - stage3.c "prekernel", sets up memory stuff and jumps to kernel - kernel is now at 0xC0000000 - 3GB+ "higher half" - Added some global variables in memory/addresses.h
122 lines
3.3 KiB
C
122 lines
3.3 KiB
C
#ifndef FILESYS_H
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#define FILESYS_H
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#include <disk/disk.h>
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#include <memory/addresses.h>
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#include <screen/text.h>
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#include <string.h>
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typedef struct {
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char filename[10];
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char filetype[3];
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uint8_t reserved;
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uint8_t startAddress;
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uint8_t length;
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} __attribute__ ((packed)) fileEntry_t;
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char* filetable = (char*)FILETABLE_LOC; // Pretty sure we don't have to care about the bootloader at 0x7c00
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fileEntry_t* findFile(const char* filename) {
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if (strlen(filename) > 14) { return NULL; } // Filename too long
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static char filenameBuf[16];
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strcpy(filenameBuf, filename);
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char* filetype = strchr(filenameBuf, '.');
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*filetype++ = '\0'; // Split filename and filetype by a NULL
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char* ft = filetable;
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while (*ft != '\0') {
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if (strcmp(filenameBuf, ft) != 0) { // Filename doesn't match
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ft += 16; // Goto next entry
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continue;
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}
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ft += 10; // Goto filetype
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if (strcmp(filetype, ft) != 0) {
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ft += 6; // Goto next entry
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continue;
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}
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ft -= 10; // Go back to start of entry
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return (fileEntry_t*)ft;
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}
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return NULL; // No such file
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}
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void updateFiletable() {
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// TODO: Update the filetable by writing data from memory to disk!
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}
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uint8_t readFile(char* filename, void* buffer) { // Hopefully the buffer is large enought :/
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fileEntry_t* file = findFile(filename);
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if (file == NULL) { return 1; } // File doesn't exist!
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diskRead(file->startAddress, file->length, buffer);
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return 0; // Success
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}
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uint8_t writeFile(char* filename, void* buffer) { // TODO: Add length so we don't write too much/too little
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fileEntry_t* file = findFile(filetable);
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if (file == NULL) { // File exists -> override
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// File doesn't exist -> create new file
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file = (fileEntry_t*)filetable;
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while (*(char*)file != '\0') { file++; } // Find end of the filetable
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*strchr(filename, '.') = '\0';
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char* filetype = filename + strlen(filename); // + 1?
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fileEntry_t* previous = file - 1;
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strcpy(file->filename, filename);
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strcpy(file->filetype, filetype);
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file->startAddress = previous->startAddress + previous->length;
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file->length = 1; // TODO: Add lenght! Currently will just assume 1 sector :/
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}
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diskWrite(file->startAddress, file->length, buffer); // Write the file
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return 0; // Success
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}
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void printFiletable(char* ft) {
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while (*ft != '\0') {
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char filename[15] = { 0 };
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uint8_t offset = 0;
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for (uint8_t i = 0; i < 14; i++) {
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if (i == 9) {
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filename[offset++] = '.';
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continue;
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}
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if (*ft != '\0') { filename[offset++] = *ft; }
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ft++;
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}
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ft++; // RESERVED
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uint8_t sector = *ft++;
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uint8_t size = *ft++;
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if (sector < 10) putc('0');
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if (sector == 0) putc('0');
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else print(itoa(sector, 10));
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print(": ");
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print(filename);
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for (uint8_t i = 14 - strlen(filename); i > 0; i--) {
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putc(' ');
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}
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print(" | ");
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if (size >> 1) {
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print(itoa(size >> 1, 10));
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if (size & 0x01) { print(".5"); }
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print("kB\n");
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} else {
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print(itoa(size*512, 10));
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print("B\n");
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}
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}
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}
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#endif
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