source: EcnlProtoTool/trunk/ntshell/fatfs/diskio.c@ 279

Last change on this file since 279 was 279, checked in by coas-nagasima, 7 years ago

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1/*-----------------------------------------------------------------------*/
2/* PFF - Low level disk control module for Win32 (C)ChaN, 2014 */
3/*-----------------------------------------------------------------------*/
4
5#include <string.h>
6#include "ffconf.h"
7#include "diskio.h"
8
9/*--------------------------------------------------------------------------
10
11 Module Private Functions
12
13---------------------------------------------------------------------------*/
14
15#define MAX_DRIVES 1 /* Max number of physical drives to be used */
16
17#define RamDisk _binary____webserver_httpd_fs_bin_start
18extern unsigned char RamDisk[];
19
20typedef struct {
21 DSTATUS status;
22 WORD sz_sector;
23 DWORD wofs;
24 DWORD wip;
25 DWORD n_sectors;
26} RD_STAT;
27
28static volatile
29RD_STAT Stat[MAX_DRIVES];
30
31static
32BYTE Buffer[SS_RAMDISK];
33
34static
35int get_status(volatile RD_STAT *stat) {
36 stat->sz_sector = SS_RAMDISK;
37 if(stat->sz_sector < _MIN_SS || stat->sz_sector > _MAX_SS) return 0;
38 stat->n_sectors = SZ_RAMDISK * 1024 / SS_RAMDISK;
39 stat->status = 0;
40 return 1;
41}
42
43/*-----------------------------------------------------------------------*/
44/* Initialize Disk Drive */
45/*-----------------------------------------------------------------------*/
46DSTATUS ramdisk_initialize (void)
47{
48 DSTATUS sta;
49
50 get_status(&Stat[0]);
51 sta = Stat[0].status;
52 Stat[0].wip = 0;
53
54 return sta;
55}
56
57/*-----------------------------------------------------------------------*/
58/* Get Disk Status */
59/*-----------------------------------------------------------------------*/
60DSTATUS ramdisk_get_status (void)
61{
62 return Stat[0].status;
63}
64
65/*-----------------------------------------------------------------------*/
66/* Read Partial Sector */
67/*-----------------------------------------------------------------------*/
68DRESULT ramdisk_read (
69 BYTE* buff, /* Data read buffer */
70 DWORD sector, /* Sector number (LBA) */
71 UINT count /* Number of sectors to read (1..128) */
72)
73{
74 DRESULT res;
75 int dofs;
76
77
78 if(Stat[0].status & STA_NOINIT) return RES_NOTRDY;
79
80 if(sector >= Stat[0].n_sectors || !count || (sector + count) > Stat[0].n_sectors/* || Stat[0].wip*/) {
81 res = RES_PARERR;
82 }
83 else {
84 if(buff) {
85 dofs = sector * Stat[0].sz_sector;
86 memcpy(buff, &RamDisk[dofs], count * Stat[0].sz_sector);
87 res = RES_OK;
88 }
89 else {
90 res = RES_OK;
91 }
92 }
93
94 return res;
95}
96
97/*-----------------------------------------------------------------------*/
98/* Write Partial Sector */
99/*-----------------------------------------------------------------------*/
100DRESULT ramdisk_write (
101 const BYTE* buff, /* Pointer to the write data */
102 DWORD sc, /* Sector number (LBA), Number of bytes to send */
103 UINT count /* Number of sectors to read (1..128) */
104)
105{
106 DRESULT res;
107 int dofs;
108
109 if(Stat[0].status & STA_NOINIT) return RES_NOTRDY;
110
111 if(!buff) {
112 if(sc) {
113 Stat[0].wip = sc;
114 Stat[0].wofs = 0;
115 memset(Buffer, 0, sizeof Buffer);
116 res = RES_OK;
117 }
118 else {
119 if(Stat[0].wip) {
120 dofs = Stat[0].wip * Stat[0].sz_sector;
121 memcpy(RamDisk + dofs, Buffer, Stat[0].sz_sector);
122 Stat[0].wip = 0;
123 res = RES_OK;
124 }
125 else {
126 res = RES_OK;
127 }
128 }
129 }
130 else {
131 if(Stat[0].wofs + sc > Stat[0].sz_sector) sc = Stat[0].sz_sector - Stat[0].wofs;
132 memcpy(&Buffer[Stat[0].wofs], buff, sc);
133 Stat[0].wofs += sc;
134 res = RES_OK;
135 }
136
137 return res;
138}
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