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adds a dynamic ramdisk. Right now its not used. It can be use to save temporary files e.g. to extract of opening.bnr
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198
source/ramdisc/ramdisc.cpp
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198
source/ramdisc/ramdisc.cpp
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#include <string.h>
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#include "ramdisc.h"
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static inline u16 u8array_to_u16 (const u8* item, int offset)
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{
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return ( item[offset] | (item[offset + 1] << 8));
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}
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static inline u32 u8array_to_u32 (const u8* item, int offset)
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{
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return ( item[offset] | (item[offset + 1] << 8) | (item[offset + 2] << 16) | (item[offset + 3] << 24) );
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}
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static inline void u16_to_u8array (u8* item, int offset, u16 value)
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{
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item[offset] = (u8) value; item[offset + 1] = (u8)(value >> 8);
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}
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static inline void u32_to_u8array (u8* item, int offset, u32 value)
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{
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item[offset] = (u8) value;
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item[offset + 1] = (u8)(value >> 8);
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item[offset + 2] = (u8)(value >> 16);
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item[offset + 3] = (u8)(value >> 24);
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}
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class padding
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{
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public:
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padding(u32 Start, u32 NumSectors)
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{
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start = Start;
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end = Start + NumSectors;
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data = new u8[NumSectors*512];
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next = 0;
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}
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~padding() { delete [] data;}
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u32 start;
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u32 end;
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u8 *data;
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padding *next;
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};
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static u32 __ramdisk_sectorsOfPadding;
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static padding *__ramdisk_data_start;
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static padding *__ramdisk_data_end;
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static bool __ramdisk_IsInserted(void)
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{
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return __ramdisk_data_start!=NULL;
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}
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//forward decleration
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static bool __ramdisk_WriteSectors(size_t Sector, size_t numSectors, u8 *Buffer);
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bool initRAMDisc(u32 Size, u32 Padding)
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{
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if(__ramdisk_data_start) return true; // is init
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if(Size > 16*1024*1024) Size = 16*1024*1024; // maximum 16 MB
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if(Size < 16*1024) Size = 16*1024; // minimum 16 MB
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if(Padding > Size) Padding = Size; // Padding maximum =Disksize
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if(Padding < 4*1024) Padding = 4*1024; // Padding minimum 4kB
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__ramdisk_sectorsOfPadding = Padding/512;
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__ramdisk_data_start = __ramdisk_data_end = new padding(0, __ramdisk_sectorsOfPadding);
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if(!__ramdisk_data_start) return false;
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// FAT12 Formatieren
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u8 sector[512] = {0, };
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sector[0x00d] = 2; /*BPB_sectorsPerCluster*/
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sector[0x00e] = 1; /*BPB_reservedSectors*/
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sector[0x010] = 1; /*BPB_numFATs*/
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u16_to_u8array (sector, 0x011, 48); /*BPB_rootEntries*/
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int num_sectors = Size/512;
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u16_to_u8array (sector, 0x013, num_sectors); /*BPB_numSectorsSmall*/
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int num_clusters = (num_sectors-1-3) /2;
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int sectors_per_fat = (num_clusters * 3 + 1023) /1024;
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u16_to_u8array (sector, 0x016, sectors_per_fat); /*BPB_sectorsPerFAT*/
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//u32_to_u8array (sector, 0x020, Size/512); /*BPB_numSectors*/
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sector[0x036] = 'F';
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sector[0x037] = 'A';
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sector[0x038] = 'T';
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sector[0x1fe] = 0x55;
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sector[0x1ff] = 0xaa;
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if(!__ramdisk_WriteSectors(0, 1, sector))
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goto error;
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memset(sector, 0, 512);
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// clear FAT & rootDir
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for(int i=1; i<= sectors_per_fat+3/*sectors_per_rootDir*/; i++)
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if(!__ramdisk_WriteSectors(1, 1, sector))
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goto error;
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return true;
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error:
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delete __ramdisk_data_start;
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__ramdisk_data_start = 0;
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return false;
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}
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void exitRAMDisc()
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{
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while(__ramdisk_data_start)
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{
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padding *tmp = __ramdisk_data_start;
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__ramdisk_data_start = __ramdisk_data_start->next;
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delete tmp;
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}
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}
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static u8 *__ramdisk_findSector(size_t Sector, size_t *Sectors)
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{
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if(__ramdisk_data_start==NULL) return NULL;
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for(padding *tmp = __ramdisk_data_start; tmp; tmp=tmp->next)
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{
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if(tmp->start <= Sector && tmp->end >= Sector)
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{
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if(Sectors) *Sectors = 1+tmp->end-Sector;
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return &(tmp->data[(Sector-tmp->start)*512]);
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}
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}
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// not found -> add padding
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__ramdisk_data_end->next = new padding((Sector/__ramdisk_sectorsOfPadding)*__ramdisk_sectorsOfPadding, __ramdisk_sectorsOfPadding);
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if(__ramdisk_data_end->next)
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{
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__ramdisk_data_end = __ramdisk_data_end->next;
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return &( __ramdisk_data_end->data[(Sector-__ramdisk_data_end->start)*512]);
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}
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return 0;
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}
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static bool __ImplizitInit = false;
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static bool __ramdisk_Startup(void)
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{
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if(!__ramdisk_IsInserted())
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{
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// Std=8MB/64kB Padding
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return (__ImplizitInit = initRAMDisc(8*1024*1024, 64 * 1024));
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}
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return true;
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}
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static bool __ramdisk_ReadSectors(size_t Sector, size_t numSectors, u8 *Buffer)
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{
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size_t num_sectors;
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while(numSectors)
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{
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if(u8 *buff = __ramdisk_findSector(Sector,&num_sectors))
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{
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if(num_sectors > numSectors) num_sectors = numSectors;
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memcpy(Buffer, buff, num_sectors * 512);
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numSectors -= num_sectors;
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Buffer+= num_sectors;
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}
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else
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return false;
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}
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return true;
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}
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static bool __ramdisk_WriteSectors(size_t Sector, size_t numSectors, u8 *Buffer)
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{
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size_t num_sectors;
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while(numSectors)
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{
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if(u8 *buff = __ramdisk_findSector(Sector,&num_sectors))
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{
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if(num_sectors > numSectors) num_sectors = numSectors;
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memcpy(buff, Buffer, num_sectors * 512);
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numSectors -= num_sectors;
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Buffer+= num_sectors;
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}
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else
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return false;
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}
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return true;
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}
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static bool __ramdisk_ClearStatus(void)
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{
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return true;
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}
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static bool __ramdisk_Shutdown(void)
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{
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if(__ImplizitInit)
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{
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__ImplizitInit = false;
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exitRAMDisc();
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}
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return true;
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}
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const DISC_INTERFACE __io_ramdisk = {
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DEVICE_TYPE_RAM_DISK,
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FEATURE_MEDIUM_CANREAD | FEATURE_MEDIUM_CANWRITE | 0x1000,
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(FN_MEDIUM_STARTUP)&__ramdisk_Startup,
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(FN_MEDIUM_ISINSERTED)&__ramdisk_IsInserted,
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(FN_MEDIUM_READSECTORS)&__ramdisk_ReadSectors,
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(FN_MEDIUM_WRITESECTORS)&__ramdisk_WriteSectors,
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(FN_MEDIUM_CLEARSTATUS)&__ramdisk_ClearStatus,
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(FN_MEDIUM_SHUTDOWN)&__ramdisk_Shutdown
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};
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39
source/ramdisc/ramdisc.h
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39
source/ramdisc/ramdisc.h
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#ifndef __RAMDISC_H
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#define __RAMDISC_H
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#include <gctypes.h>
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#include <ogc/disc_io.h>
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#define DEVICE_TYPE_RAM_DISK (('R'<<24)|('A'<<16)|('M'<<8)|'D')
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extern const DISC_INTERFACE __io_ramdisk;
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/*
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initRamDisc initialize a dynamic RAM-disc.
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Size is the maximum disksize in a range from 16kB up to 16MB
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Padding is the size of blocks to be allocate in a range from 4kB up to Disksize
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The RAM-disc is formated in FAT12.
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*/
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bool initRAMDisc(u32 Size, u32 Padding);
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/*
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exitRAMDisc destroy all datas
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*/
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void exitRAMDisc();
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/*
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NOTE:
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if the RAM-disc allready initialized, then initRAMDisc returns with "true" without reinitialize it with the new parameters.
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__io_ramdisk.startup() initialize a ramdisc of 8MB with a padding of 64kB
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__io_ramdisk.shutdown () will only destroy the RAM-disk, if they from __io_ramdisk.startup () was initialized
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if the ramdisc initialized from initRamDisc, then you can remount the filesystem without lost all datas
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Example:
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fatMount("RAM", &__io_ramdisk, 0, 0, 0);
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...
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fopen("RAM:/file", ...);
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*/
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#endif /*__RAMDISC_H*/
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