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对FAT的支持

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Yourtion
2016-04-29 12:19:26 +08:00
parent 021ae344eb
commit 2f2d306783
1 changed files with 41 additions and 3 deletions
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44
19_day/bootpack.c
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@@ -17,6 +17,8 @@ void make_textbox8(struct SHEET *sht, int x0, int y0, int sx, int sy, int c);
void make_wtitle8(unsigned char *buf, int xsize, char *title, char act); void make_wtitle8(unsigned char *buf, int xsize, char *title, char act);
void console_task(struct SHEET *sheet, unsigned int memtotal); void console_task(struct SHEET *sheet, unsigned int memtotal);
int cons_newline(int cursor_y, struct SHEET *sheet); int cons_newline(int cursor_y, struct SHEET *sheet);
void file_readfat(int *fat, unsigned char *img);
void file_loadfile(int clustno, int size, char *buf, int *fat, char *img);
#define KEYCMD_LED 0xed #define KEYCMD_LED 0xed
@@ -388,11 +390,13 @@ void console_task(struct SHEET *sheet, unsigned int memtotal)
struct MEMMAN *memman = (struct MEMMAN *) MEMMAN_ADDR; struct MEMMAN *memman = (struct MEMMAN *) MEMMAN_ADDR;
int x, y; int x, y;
struct FILEINFO *finfo = (struct FILEINFO *) (ADR_DISKIMG + 0x002600); struct FILEINFO *finfo = (struct FILEINFO *) (ADR_DISKIMG + 0x002600);
int *fat = (int *) memman_alloc_4k(memman, 4 * 2880);
fifo32_init(&task->fifo, 128, fifobuf, task); fifo32_init(&task->fifo, 128, fifobuf, task);
timer = timer_alloc(); timer = timer_alloc();
timer_init(timer, &task->fifo, 1); timer_init(timer, &task->fifo, 1);
timer_settime(timer, 50); timer_settime(timer, 50);
file_readfat(fat, (unsigned char *) (ADR_DISKIMG + 0x000200));
/*显示提示符*/ /*显示提示符*/
putfonts8_asc_sht(sheet, 8, 28, COL8_FFFFFF, COL8_000000, ">", 1); putfonts8_asc_sht(sheet, 8, 28, COL8_FFFFFF, COL8_000000, ">", 1);
@@ -518,11 +522,12 @@ void console_task(struct SHEET *sheet, unsigned int memtotal)
if (x < 224 && finfo[x].name[0] != 0x00) { if (x < 224 && finfo[x].name[0] != 0x00) {
/*找到文件的情况*/ /*找到文件的情况*/
y = finfo[x].size; y = finfo[x].size;
p = (char *) (finfo[x].clustno * 512 + 0x003e00 + ADR_DISKIMG); p = (char *) memman_alloc_4k(memman, finfo[x].size);
file_loadfile(finfo[x].clustno, finfo[x].size, p, fat, (char *) (ADR_DISKIMG + 0x003e00));
cursor_x = 8; cursor_x = 8;
for (x = 0; x < y; x++) { for (y = 0; y < finfo[x].size; y++) {
/*逐字输出*/ /*逐字输出*/
s[0] = p[x]; s[0] = p[y];
s[1] = 0; s[1] = 0;
if (s[0] == 0x09) { /*制表符*/ if (s[0] == 0x09) { /*制表符*/
for (;;) { for (;;) {
@@ -550,6 +555,7 @@ void console_task(struct SHEET *sheet, unsigned int memtotal)
} }
} }
} }
memman_free_4k(memman, (int) p, finfo[x].size);
} else { } else {
/*没有找到文件的情况*/ /*没有找到文件的情况*/
putfonts8_asc_sht(sheet, 8, cursor_y, COL8_FFFFFF, COL8_000000, "File not found.", 15); putfonts8_asc_sht(sheet, 8, cursor_y, COL8_FFFFFF, COL8_000000, "File not found.", 15);
@@ -607,3 +613,35 @@ int cons_newline(int cursor_y, struct SHEET *sheet)
} }
return cursor_y; return cursor_y;
} }
void file_readfat(int *fat, unsigned char *img)
/*将磁盘映像中的FAT解压缩 */
{
int i, j = 0;
for (i = 0; i < 2880; i += 2) {
fat[i + 0] = (img[j + 0] | img[j + 1] << 8) & 0xfff;
fat[i + 1] = (img[j + 1] >> 4 | img[j + 2] << 4) & 0xfff;
j += 3;
}
return;
}
void file_loadfile(int clustno, int size, char *buf, int *fat, char *img)
{
int i;
for (;;) {
if (size <= 512) {
for (i = 0; i < size; i++) {
buf[i] = img[clustno * 512 + i];
}
break;
}
for (i = 0; i < 512; i++) {
buf[i] = img[clustno * 512 + i];
}
size -= 512;
buf += 512;
clustno = fat[clustno];
}
return;
}