78 lines
1.4 KiB
C
78 lines
1.4 KiB
C
#include <stdio.h>
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#include "fs.h"
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void file_read_fat(int *fat, unsigned char *img) {
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int i, j = 0;
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for (i = 0; i < 2880; i += 2) {
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fat[i + 0] = (img[j + 0] | img[j + 1] << 8) & 0xfff;
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fat[i + 1] = (img[j + 1] >> 4 | img[j + 2] << 4) & 0xfff;
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j += 3;
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}
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}
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void file_load_file(int clustno, int size, char *buf, int *fat, char *img) {
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for (;;) {
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if (size <= 512) {
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for (int i = 0; i < size; i++) {
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buf[i] = img[clustno * 512 + i];
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}
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break;
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}
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for (int i = 0; i < 512; i++) {
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buf[i] = img[clustno * 512 + i];
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}
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size -= 512;
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buf += 512;
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clustno = fat[clustno];
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}
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}
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struct FileInfo *file_search(char *name, struct FileInfo *finfo, int max) {
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int i, j;
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char s[12];
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for (j = 0; j < 11; j++) {
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s[j] = ' ';
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}
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j = 0;
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for (i = 0; name[i] != '\0'; i++) {
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if (j > 11) {
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return NULL;
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}
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if (name[i] == '.' && s[j] <= 'z') {
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j = 8;
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} else {
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s[j] = name[i];
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if ('a' <= s[j] && s[j] <= 'z') {
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// 转为大写
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s[j] -= 0x20;
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}
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j++;
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}
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}
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for (i = 0; i < max;) {
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if (finfo[i].name[0] == '\0') {
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break;
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}
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if (!(finfo[i].type & 0x18)) {
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for (j = 0; j < 11; j++) {
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if (finfo[i].name[j] != s[j]) {
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goto next;
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}
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}
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return finfo + i;
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}
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next:
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i++;
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}
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return NULL;
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}
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