📄 fat32finddirentry.lst
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74 =2 struct BootSecStr //引导扇区结构
75 =2 {
76 =2 BYTE BS_jmpBoot[3];
77 =2 BYTE BS_OEMName[8];
78 =2 WORD BPB_BytesPerSec; //每扇区字节数 512
79 =2 BYTE BPB_SecPerClus; //每簇扇区数 1 2 4 8 16 32 64 128
80 =2 WORD BPB_RsvdSecCnt; //保留扇区数 0x20
81 =2 BYTE BPB_NumFATs; //FAT表个数 2
82 =2 WORD BPB_RootEntCnt;
83 =2 WORD BPB_TotSec16;
84 =2 BYTE BPB_Media;
85 =2 WORD BPB_FATSz16;
86 =2 WORD BPB_SecPerTrk;
87 =2 WORD BPB_NumHeads;
88 =2 DWORD BPB_HiddSec;
89 =2 DWORD BPB_TotSec32;
90 =2 union FATUni
91 =2 {
92 =2 struct BootSecFAT32Str F32;
93 =2 struct BootSecFAT16Str F16;
94 =2 }FAT;
95 =2
96 =2 };
97 =2
98 =2 struct DPTStr //分区表结构
99 =2 {
100 =2 BYTE BootFlag;
101 =2 BYTE CHSBegin[3];
C51 COMPILER V7.50 FAT32FINDDIRENTRY 11/20/2006 15:50:38 PAGE 6
102 =2 BYTE TypeCode;
103 =2 BYTE CHSEnd[3];
104 =2 DWORD LBABegin;
105 =2 DWORD CntSec;
106 =2 };
107 =2
108 =2 struct sDPTStr //简化的分区表
109 =2 {
110 =2 BYTE TypeCode;
111 =2 DWORD LBABegin;
112 =2 DWORD CntSec;
113 =2 };
114 =2
115 =2 struct FAT32FSInfoStr //FAT32扩展信息结构
116 =2 {
117 =2 DWORD LeadSig;
118 =2 BYTE Reserved1[480];
119 =2 DWORD StrucSig;
120 =2 DWORD FreeCount;
121 =2 DWORD NxtFree;
122 =2 BYTE Reserved2[12];
123 =2 DWORD TrailSig;
124 =2 };
125 =2
126 =2 struct FAT32SDirStr //FAT目录结构 短文件名
127 =2 {
128 =2 CHAR Name[11];
129 =2 BYTE Attr;
130 =2 BYTE NTRes;
131 =2 BYTE CrtTimeTenth;
132 =2 WORD CrtTime;
133 =2 WORD CrtDate;
134 =2 WORD LstAccDate;
135 =2 WORD FstClusHI;
136 =2 WORD WrtTime;
137 =2 WORD WrtDate;
138 =2 WORD FstClusLO;
139 =2 DWORD FileSize;
140 =2 };
141 =2
142 =2 struct FAT32LDirStr //FAT目录结构 长文件名
143 =2 {
144 =2 BYTE Ord;
145 =2 BYTE Name1[10];
146 =2 BYTE Attr;
147 =2 BYTE Type;
148 =2 BYTE Chksum;
149 =2 BYTE Name2[12];
150 =2 WORD FstClusLO;
151 =2 BYTE Name3[4];
152 =2 };
153 =2
154 =2 struct FAT32Str //FAT32参数表
155 =2 {
156 =2 BYTE ClusSecCnt; //当前簇扇区计数
157 =2 DWORD CurrentDirectory; //当前目录入口（簇号）
158 =2 BYTE SecPerClus; //每簇扇区数 1 2 4 8 16 32 64 128
159 =2 WORD RsvdSecCnt; //保留扇区数 0x20
160 =2 BYTE NumFATs; //FAT表个数 2
161 =2 DWORD RootClus; //根目录开始的簇
162 =2 DWORD ClusSec; //簇开始的扇区
163 =2 DWORD FATSz; //FAT表大小（扇区）
C51 COMPILER V7.50 FAT32FINDDIRENTRY 11/20/2006 15:50:38 PAGE 7
164 =2 DWORD FATSec; //FAT表开始扇区
165 =2 DWORD FSISec; //FSI所在扇区
166 =2 DWORD FSIFreeCount; //空闲簇数
167 =2 DWORD FSINxtFree; //空闲簇搜索指针
168 =2 };
169 =2
170 =2 struct FCBStr
171 =2 {
172 =2 CHAR FileName[12]; //文件名
173 =2 DWORD Size; //文件大小
174 =2 DWORD FirstCluster; //第一个簇
175 =2 DWORD LastCluster; //最近一次读到的簇号
176 =2 DWORD ClusSecCnt; //当前簇扇区计数
177 =2 DWORD ByteCnt; //当前字节计数
178 =2 };
179 =2
180 =2 struct FATStr
181 =2 {
182 =2 DWORD Sector;
183 =2 DWORD FAT[128];
184 =2 };
185 =2
186 =2 #ifndef _LIBRARY_DEFINE
=2 xdata BYTE DiskBuffer[512];
=2
=2 xdata struct sDPTStr sDPT[4];
=2 xdata struct FAT32Str FAT32;
=2 xdata struct FCBStr FCB[FAT32_MAX_FCB];
=2 xdata CHAR LongFileName[256];
=2 xdata struct FATStr FAT;
=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 FAT32SDirStr *sDIR; //FAT目录结构指针
=2 xdata struct FAT32LDirStr *lDIR; //FAT目录结构指针
=2 #endif
200 =2 #endif
201 =2
202 =2 extern xdata BYTE DiskBuffer[512];
203 =2
204 =2 extern xdata struct sDPTStr sDPT[4];
205 =2 extern xdata struct FAT32Str FAT32;
206 =2 extern xdata struct FCBStr FCB[FAT32_MAX_FCB];
207 =2 extern xdata CHAR LongFileName[256];
208 =2 extern xdata struct FATStr FAT;
209 =2 extern xdata struct DPTStr *DPT; //分区表结构指针
210 =2 extern xdata struct BootSecStr *BOOTSEC; //引导扇区结构指针
211 =2 extern xdata struct FAT32FSInfoStr *FSI; //FAT32扩展信息
212 =2 extern xdata struct FAT32SDirStr *sDIR; //FAT目录结构指针
213 =2 extern xdata struct FAT32LDirStr *lDIR; //FAT目录结构指针
214 =2
215 =2 extern void FAT32Init(void);
216 =2 extern BYTE FAT32MountPartition(void);
217 =2 extern BYTE FAT32MountVolumeID(BYTE Partition);
218 =2 extern BYTE FAT32GetDirName(WORD SecNum);
219 =2 extern void FAT32GetPartLongName(struct FAT32LDirStr *ldp,CHAR *name);
220 =2 extern DWORD FAT32DiskSize(void);
221 =2 extern DWORD FAT32DiskFreeSize(void);
222 =2 extern BYTE FAT32FindDIREntry(CHAR *DirName);
223 =2 extern void FAT32ReadCluster(DWORD *Cluster);
224 =2 extern BYTE FAT32ChangeDirectory(CHAR *DirName);
225 =2 extern BYTE FAT32ListDirectory(void);
C51 COMPILER V7.50 FAT32FINDDIRENTRY 11/20/2006 15:50:38 PAGE 8
226 =2 extern DWORD FAT32NextCluster(DWORD CurrentCluster);
227 =2 extern BYTE FAT32OpenFile(CHAR *filename);
228 =2 extern void FAT32CloseFile(BYTE fp);
229 =2 extern WORD FAT32ReadFile(BYTE fp);
11 =1
12 =1
3 #endif
4
5 BYTE FAT32FindDIREntry(CHAR *DirName);
6
7 BYTE FAT32FindDIREntry(CHAR *DirName)
8 {
9 1 xdata BYTE i,j,k,m,n;
10 1 xdata DWORD chain;
11 1 xdata CHAR temp[27];
12 1
13 1 chain=FAT32.CurrentDirectory;
14 1 FAT32.ClusSecCnt=0;
15 1 while(chain!=0x0fffffff)
16 1 {
17 2 FAT32ReadCluster(&chain);
18 2 for (i=0;i<16;i++)
19 2 {
20 3 if (sDIR[i].Name[0]==0xe5||sDIR[i].Name[0]==0x00) continue; //空目录项跳过
21 3 if ((sDIR[i].Attr&FAT32_ATTR_LONG_NAME_MASK)==FAT32_ATTR_LONG_NAME)
22 3 //长文件名
23 3 {
24 4 j=lDIR[i].Ord - FAT32_LAST_LONG_ENTRY;
25 4 LongFileName[0]=0;n=0;
26 4 for(;j>0;j--)
27 4 {
28 5 FAT32GetPartLongName(lDIR+i,temp);
29 5 m=strlen((char *)temp);
30 5 k=m+n;
31 5 for(;n>0;n--)
32 5 LongFileName[m+n]=LongFileName[n];
33 5 LongFileName[m+n]=LongFileName[n];
34 5 m--;
35 5 for(;m>0;m--)
36 5 LongFileName[m]=temp[m];
37 5 LongFileName[m]=temp[m];
38 5 n=k;
39 5 i++;
40 5 if (i==16)
41 5 {
42 6 FAT32ReadCluster(&chain);
43 6 i=0;
44 6 }
45 5 }
46 4 if (strcmp((const char *)DirName,(const char *)LongFileName)==0) return(i);
47 4 }
48 3 else
49 3 {
50 4 //短文件名
51 4 if (sDIR[i].Attr&FAT32_ATTR_VOLUME_ID) continue; //如果是卷标则跳过
52 4 for(j=0;j<11;j++)
53 4 temp[j]=sDIR[i].Name[j];
54 4 temp[j]=0;
55 4 if (strcmp((const char *)DirName,(const char *)temp)==0) return(i);
56 4 }
57 3 }
58 2 }
C51 COMPILER V7.50 FAT32FINDDIRENTRY 11/20/2006 15:50:38 PAGE 9
59 1 return(i);
60 1 }
C51 COMPILER V7.50 FAT32FINDDIRENTRY 11/20/2006 15:50:38 PAGE 10
ASSEMBLY LISTING OF GENERATED OBJECT CODE
; FUNCTION _FAT32FindDIREntry (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 # 13
000B 900000 E MOV DPTR,#FAT32+01H
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 R MOV DPTR,#chain
001C 120000 E LCALL ?C?LSTXDATA
; SOURCE LINE # 14
001F E4 CLR A
0020 900000 E MOV DPTR,#FAT32
0023 F0 MOVX @DPTR,A
0024 ?C0001:
; SOURCE LINE # 15
0024 74FF MOV A,#0FFH
0026 FF MOV R7,A
0027 FE MOV R6,A
0028 FD MOV R5,A
0029 7C0F MOV R4,#0FH
002B 900000 R MOV DPTR,#chain
002E E0 MOVX A,@DPTR
002F F8 MOV R0,A
0030 A3 INC DPTR
0031 E0 MOVX A,@DPTR
0032 F9 MOV R1,A
0033 A3 INC DPTR
0034 E0 MOVX A,@DPTR
0035 FA MOV R2,A
0036 A3 INC DPTR
0037 E0 MOVX A,@DPTR
0038 FB MOV R3,A
0039 C3 CLR C
003A 120000 E LCALL ?C?ULCMP
003D 7003 JNZ $ + 5H
003F 020000 R LJMP ?C0002
; SOURCE LINE # 16
; SOURCE LINE # 17
0042 7B01 MOV R3,#01H
0044 7A00 R MOV R2,#HIGH chain
0046 7900 R MOV R1,#LOW chain
C51 COMPILER V7.50 FAT32FINDDIRENTRY 11/20/2006 15:50:38 PAGE 11
0048 120000 E LCALL _FAT32ReadCluster
; SOURCE LINE # 18
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