📄 fat16finddirentry.lst
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143 =2 BYTE FATType;
144 =2 DWORD LBABegin;
145 =2 DWORD CntSec;
146 =2 };
147 =2
148 =2 struct FAT32FSInfoStr //FAT32扩展信息结构
149 =2 {
150 =2 DWORD LeadSig;
151 =2 BYTE Reserved1[480];
152 =2 DWORD StrucSig;
153 =2 DWORD FreeCount;
154 =2 DWORD NxtFree;
155 =2 BYTE Reserved2[12];
156 =2 DWORD TrailSig;
157 =2 };
158 =2
159 =2 struct FATSDirStr //FAT目录结构 短文件名
160 =2 {
161 =2 CHAR Name[11];
162 =2 BYTE Attr;
163 =2 BYTE NTRes;
164 =2 BYTE CrtTimeTenth;
165 =2 WORD CrtTime;
166 =2 WORD CrtDate;
167 =2 WORD LstAccDate;
168 =2 WORD FstClusHI;
169 =2 WORD WrtTime;
170 =2 WORD WrtDate;
171 =2 WORD FstClusLO;
172 =2 DWORD FileSize;
173 =2 };
174 =2
175 =2 struct FATLDirStr //FAT目录结构 长文件名
176 =2 {
177 =2 BYTE Ord;
178 =2 BYTE Name1[10];
179 =2 BYTE Attr;
180 =2 BYTE Type;
181 =2 BYTE Chksum;
182 =2 BYTE Name2[12];
183 =2 WORD FstClusLO;
184 =2 BYTE Name3[4];
185 =2 };
186 =2
C51 COMPILER V6.23a FAT16FINDDIRENTRY 12/24/2004 00:11:43 PAGE 10
187 =2 struct FATStr //FAT参数表
188 =2 {
189 =2 // BYTE ClusSecCnt; //当前簇扇区计数
190 =2 DWORD CurrentDirectory; //当前目录入口（簇号）
191 =2 BYTE SecPerClus; //每簇扇区数 1 2 4 8 16 32 64 128
192 =2 DWORD RootClus; //根目录开始的簇
193 =2 BYTE RootSectors; //根目录占用的扇区数
194 =2 DWORD ClusSec; //簇开始的扇区
195 =2 DWORD FATSz; //FAT表大小（扇区）
196 =2 DWORD FATSec; //FAT表开始扇区
197 =2 DWORD FSISec; //FSI所在扇区
198 =2 DWORD FSIFreeCount; //空闲簇数
199 =2 DWORD FSINxtFree; //空闲簇搜索指针
200 =2 };
201 =2
202 =2 struct FCBStr
203 =2 {
204 =2 CHAR FileName[12]; //文件名
205 =2 DWORD Size; //文件大小
206 =2 DWORD FirstCluster; //第一个簇
207 =2 DWORD LastCluster; //最近一次读到的簇号
208 =2 DWORD ClusSecCnt; //当前簇扇区计数
209 =2 DWORD ByteCnt; //当前字节计数
210 =2 };
211 =2
212 =2 struct FATTableStr
213 =2 {
214 =2 DWORD Sector;
215 =2 union FATUin
216 =2 {
217 =2 DWORD F32[128];
218 =2 WORD F16[256];
219 =2 BYTE F12[512];
220 =2 }FAT;
221 =2 };
222 =2
223 =2 struct FATClusterStr
224 =2 {
225 =2 BYTE SecOffset; //扇区偏移量
226 =2 DWORD Sector; //扇区号
227 =2 DWORD Cluster; //簇号
228 =2 };
229 =2
230 =2 #ifndef _LIBRARY_DEFINE
=2 xdata BYTE DiskBuffer[512];
=2
=2 xdata struct StorageMediaStr StorageMedia;
=2 xdata struct sDPTStr sDPT[FAT_MAX_PARTITIONS];
=2 xdata struct FATStr FAT;
=2 xdata struct FCBStr FCB[FAT_MAX_FCB];
=2 xdata CHAR LongFileName[256];
=2 xdata struct FATTableStr FATTable;
=2 xdata struct DPTStr *DPT; //分区表结构指针
=2 xdata struct BootSecStr *BOOTSEC; //引导扇区结构指针
=2 xdata struct FAT32FSInfoStr *FSI; //FAT32扩展信息
=2 xdata struct FATSDirStr *sDIR; //FAT目录结构指针
=2 xdata struct FATLDirStr *lDIR; //FAT目录结构指针
=2 #endif
245 =2 #endif
246 =2
247 =2 extern xdata BYTE DiskBuffer[512];
248 =2
C51 COMPILER V6.23a FAT16FINDDIRENTRY 12/24/2004 00:11:43 PAGE 11
249 =2 extern xdata struct StorageMediaStr StorageMedia;
250 =2 extern xdata struct sDPTStr sDPT[FAT_MAX_PARTITIONS];
251 =2 extern xdata struct FATStr FAT;
252 =2 extern xdata struct FCBStr FCB[FAT_MAX_FCB];
253 =2 extern xdata CHAR LongFileName[256];
254 =2 extern xdata struct FATTableStr FATTable;
255 =2 extern xdata struct DPTStr *DPT; //分区表结构指针
256 =2 extern xdata struct BootSecStr *BOOTSEC; //引导扇区结构指针
257 =2 extern xdata struct FAT32FSInfoStr *FSI; //FAT32扩展信息
258 =2 extern xdata struct FATSDirStr *sDIR; //FAT目录结构指针
259 =2 extern xdata struct FATLDirStr *lDIR; //FAT目录结构指针
260 =2
261 =2 extern void FATInit(void);
262 =2 extern BYTE FATSelectMedia(BYTE Media);
263 =2 extern BYTE FATFindPartitions(void);
264 =2 extern BYTE FATMountPartition(void);
265 =2 extern BYTE FATMountVolumeID(BYTE Partition);
266 =2 extern void FATGetPartLongName(struct FATLDirStr *ldp,CHAR *name);
267 =2 extern DWORD FATDiskSize(void);
268 =2 extern DWORD FATDiskFreeSize(void);
269 =2 extern BYTE FATFindDIREntry(CHAR *DirName);
270 =2 extern BYTE FAT32FindDIREntry(CHAR *DirName);
271 =2 extern BYTE FAT16FindDIREntry(CHAR *DirName);
272 =2 void FATReadCluster(struct FATClusterStr *Cluster,BYTE *Buffer);
273 =2 extern BYTE FATChangeDirectory(CHAR *DirName);
274 =2 extern BYTE FATListDirectory(void);
275 =2 extern BYTE FAT32ListDirectory(void);
276 =2 extern BYTE FAT16ListDirectory(void);
277 =2 extern void FATNextCluster(DWORD *CurrentCluster);
278 =2 extern BYTE FATGetDirName(WORD SecNum);
279 =2 extern BYTE FATOpenFile(CHAR *filename);
280 =2 extern void FATCloseFile(BYTE fp);
281 =2 extern WORD FATReadFile(BYTE fp);
282 =2
11 =1
3 #endif
4
5 BYTE FAT16FindDIREntry(CHAR *DirName);
6
7 BYTE FAT16FindDIREntry(CHAR *DirName)
8 {
9 1 xdata BYTE i,j,m;
10 1 xdata CHAR temp[27];
11 1 xdata DWORD Sector;
12 1 xdata struct FATClusterStr ReadCluster;
13 1
14 1 if (FAT.CurrentDirectory==FAT.RootClus) //根目录
15 1 {
16 2 Sector=FAT.CurrentDirectory;
17 2 for(m=0;m<FAT.RootSectors;m++)
18 2 {
19 3 StorageMedia.ReadSector(Sector++,DiskBuffer);
20 3 for (i=0;i<16;i++)
21 3 {
22 4 if (sDIR[i].Attr&FAT_ATTR_VOLUME_ID) continue; //如果是卷标则跳过
23 4 if (sDIR[i].Name[0]==0xe5||sDIR[i].Name[0]==0x00) continue; //空目录项跳过
24 4 for(j=0;j<11;j++)
25 4 temp[j]=sDIR[i].Name[j];
26 4 temp[j]=0;
27 4 if (strcmp((const char *)DirName,(const char *)temp)==0) return(i);
28 4 }
29 3 }
C51 COMPILER V6.23a FAT16FINDDIRENTRY 12/24/2004 00:11:43 PAGE 12
30 2 }
31 1 else
32 1 {
33 2 ReadCluster.Cluster=FAT.CurrentDirectory;
34 2 ReadCluster.SecOffset=0;
35 2 while(ReadCluster.Cluster!=FAT_CLUSTER_END16)
36 2 {
37 3 FATReadCluster(&ReadCluster,DiskBuffer);
38 3 for (i=0;i<16;i++)
39 3 {
40 4 if (sDIR[i].Attr&FAT_ATTR_VOLUME_ID) continue; //如果是卷标则跳过
41 4 if (sDIR[i].Name[0]==0xe5||sDIR[i].Name[0]==0x00) continue; //空目录项跳过
42 4 for(j=0;j<11;j++)
43 4 temp[j]=sDIR[i].Name[j];
44 4 temp[j]=0;
45 4 if (strcmp((const char *)DirName,(const char *)temp)==0) return(i);
46 4 }
47 3 }
48 2 }
49 1 return(i);
50 1 }
C51 COMPILER V6.23a FAT16FINDDIRENTRY 12/24/2004 00:11:43 PAGE 13
ASSEMBLY LISTING OF GENERATED OBJECT CODE
; FUNCTION _FAT16FindDIREntry (BEGIN)
; SOURCE LINE # 7
0000 900000 R MOV DPTR,#DirName
0003 EB MOV A,R3
0004 F0 MOVX @DPTR,A
0005 A3 INC DPTR
0006 EA MOV A,R2
0007 F0 MOVX @DPTR,A
0008 A3 INC DPTR
0009 E9 MOV A,R1
000A F0 MOVX @DPTR,A
; SOURCE LINE # 8
; SOURCE LINE # 14
000B 900000 E MOV DPTR,#FAT+05H
000E E0 MOVX A,@DPTR
000F FC MOV R4,A
0010 A3 INC DPTR
0011 E0 MOVX A,@DPTR
0012 FD MOV R5,A
0013 A3 INC DPTR
0014 E0 MOVX A,@DPTR
0015 FE MOV R6,A
0016 A3 INC DPTR
0017 E0 MOVX A,@DPTR
0018 FF MOV R7,A
0019 900000 E MOV DPTR,#FAT
001C E0 MOVX A,@DPTR
001D F8 MOV R0,A
001E A3 INC DPTR
001F E0 MOVX A,@DPTR
0020 F9 MOV R1,A
0021 A3 INC DPTR
0022 E0 MOVX A,@DPTR
0023 FA MOV R2,A
0024 A3 INC DPTR
0025 E0 MOVX A,@DPTR
0026 FB MOV R3,A
0027 C3 CLR C
0028 120000 E LCALL ?C?ULCMP
002B 6003 JZ $ + 5H
002D 020000 R LJMP ?C0001
; SOURCE LINE # 15
; SOURCE LINE # 16
0030 900000 E MOV DPTR,#FAT
0033 E0 MOVX A,@DPTR
0034 FC MOV R4,A
0035 A3 INC DPTR
0036 E0 MOVX A,@DPTR
0037 FD MOV R5,A
0038 A3 INC DPTR
0039 E0 MOVX A,@DPTR
003A FE MOV R6,A
003B A3 INC DPTR
003C E0 MOVX A,@DPTR
003D FF MOV R7,A
003E 900000 R MOV DPTR,#Sector
0041 120000 E LCALL ?C?LSTXDATA
; SOURCE LINE # 17
0044 E4 CLR A
C51 COMPILER V6.23a FAT16FINDDIRENTRY 12/24/2004 00:11:43 PAGE 14
0045 900000 R MOV DPTR,#m
0048 F0 MOVX @DPTR,A
0049 ?C0002:
0049 900000 E MOV DPTR,#FAT+09H
004C E0 MOVX A,@DPTR
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