From 2f2d306783085fe6695dad86fba9d535469f5390 Mon Sep 17 00:00:00 2001
From: Yourtion <yourtion@gmail.com>
Date: Fri, 29 Apr 2016 12:19:26 +0800
Subject: [PATCH] =?UTF-8?q?=E5=AF=B9FAT=E7=9A=84=E6=94=AF=E6=8C=81?=
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---
 19_day/bootpack.c | 44 +++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 41 insertions(+), 3 deletions(-)

diff --git a/19_day/bootpack.c b/19_day/bootpack.c
index ee8b293..ac6f823 100644
--- a/19_day/bootpack.c
+++ b/19_day/bootpack.c
@@ -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 console_task(struct SHEET *sheet, unsigned int memtotal);
 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
 
@@ -388,11 +390,13 @@ void console_task(struct SHEET *sheet, unsigned int memtotal)
 	struct MEMMAN *memman = (struct MEMMAN *) MEMMAN_ADDR;
 	int x, y;
 	struct FILEINFO *finfo = (struct FILEINFO *) (ADR_DISKIMG + 0x002600);
+	int *fat = (int *) memman_alloc_4k(memman, 4 * 2880);
 
 	fifo32_init(&task->fifo, 128, fifobuf, task);
 	timer = timer_alloc();
 	timer_init(timer, &task->fifo, 1);
 	timer_settime(timer, 50);
+	file_readfat(fat, (unsigned char *) (ADR_DISKIMG + 0x000200)); 
 
 	/*显示提示符*/
 	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) {
 						/*找到文件的情况*/
 						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;
-						for (x = 0; x < y; x++) {
+						for (y = 0; y < finfo[x].size; y++) {
 							/*逐字输出*/
-							s[0] = p[x];
+							s[0] = p[y];
 							s[1] = 0;
 							if (s[0] == 0x09) { /*制表符*/
 								for (;;) {
@@ -550,6 +555,7 @@ void console_task(struct SHEET *sheet, unsigned int memtotal)
 								}
 							}
 						}
+						memman_free_4k(memman, (int) p, finfo[x].size);
 					} else {
 						/*没有找到文件的情况*/
 						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;
 }
+
+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;
+}