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Add Ventoy Sparse Image Option

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This commit is contained in:
longpanda
2021-07-10 09:41:52 +08:00
parent 425d640480
commit c280baae27
8 changed files with 506 additions and 25 deletions
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66
Ventoy2Disk/Ventoy2Disk/ff14/source/diskio.c
View File

@@ -11,6 +11,8 @@
#include "ff.h" /* Obtains integer types */
#include "diskio.h" /* Declarations of disk functions */
#include "../Ventoy2Disk.h"
/* Definitions of physical drive number for each drive */
#define DEV_RAM 0 /* Example: Map Ramdisk to physical drive 0 */
@@ -23,12 +25,41 @@ static UINT8 g_MbrSector[512];
HANDLE g_hPhyDrive;
UINT64 g_SectorCount;
FILE *g_VentoyImgFp = NULL;
VTSI_SEGMENT *g_VentoySegment = NULL;
int g_VentoyMaxSeg = 0;
int g_VentoyCurSeg = -1;
UINT64 g_VentoyDataOffset = 0;
void disk_io_set_param(HANDLE Handle, UINT64 SectorCount)
{
g_hPhyDrive = Handle;
g_SectorCount = SectorCount;
}
void disk_io_set_imghook(FILE *fp, VTSI_SEGMENT *segment, int maxseg, UINT64 data_offset)
{
g_VentoyImgFp = fp;
g_VentoySegment = segment;
g_VentoyMaxSeg = maxseg;
memset(segment, 0, maxseg * sizeof(VTSI_SEGMENT));
g_VentoyCurSeg = -1;
g_VentoyDataOffset = data_offset;
}
void disk_io_reset_imghook(int *psegnum, UINT64 *pDataOffset)
{
*psegnum = g_VentoyCurSeg + 1;
*pDataOffset = g_VentoyDataOffset;
g_VentoyImgFp = NULL;
g_VentoySegment = NULL;
g_VentoyMaxSeg = 0;
g_VentoyCurSeg = -1;
g_VentoyDataOffset = 0;
}
/*-----------------------------------------------------------------------*/
/* Get Drive Status */
/*-----------------------------------------------------------------------*/
@@ -126,6 +157,13 @@ DRESULT disk_read (
BOOL bRet;
LARGE_INTEGER liCurrentPosition;
//Log("xxx disk_read: sector:%ld count:%ld", (long)sector, (long)count);
if (g_VentoyImgFp)
{
return RES_OK;
}
liCurrentPosition.QuadPart = sector * 512;
SetFilePointerEx(g_hPhyDrive, liCurrentPosition, &liCurrentPosition, FILE_BEGIN);
@@ -162,6 +200,9 @@ DRESULT disk_write (
DWORD dwSize;
BOOL bRet;
LARGE_INTEGER liCurrentPosition;
VTSI_SEGMENT *CurSeg = NULL;
Log("==== disk_write: sector:%ld count:%ld", (long)sector, (long)count);
// skip MBR
if (sector == 0)
@@ -177,6 +218,31 @@ DRESULT disk_write (
count--;
}
if (g_VentoyImgFp)
{
CurSeg = g_VentoySegment + g_VentoyCurSeg;
if (g_VentoyCurSeg >= 0 && CurSeg->sector_num > 0 && sector == CurSeg->disk_start_sector + CurSeg->sector_num)
{
CurSeg->sector_num += count; //merge
}
else
{
g_VentoyCurSeg++;
CurSeg++;
CurSeg->disk_start_sector = sector;
CurSeg->data_offset = g_VentoyDataOffset;
CurSeg->sector_num = count;
}
g_VentoyDataOffset += count * 512;
fwrite(buff, 1, count * 512, g_VentoyImgFp);
return RES_OK;
}
liCurrentPosition.QuadPart = sector * 512;
SetFilePointerEx(g_hPhyDrive, liCurrentPosition, &liCurrentPosition, FILE_BEGIN);

5
Ventoy2Disk/Ventoy2Disk/ff14/source/ff.c
View File

@@ -6067,6 +6067,11 @@ FRESULT f_mkfs (
/* Initialize the root directory */
mem_set(buf, 0, sz_buf * ss);
buf[SZDIRE * 0 + 0] = ET_VLABEL; /* Volume label entry (no label) */
//default label: Ventoy (unicode)
buf[1] = 6; //label length
memcpy(buf + 2, L"Ventoy", 2 * buf[1]);
buf[SZDIRE * 1 + 0] = ET_BITMAP; /* Bitmap entry */
st_dword(buf + SZDIRE * 1 + 20, 2); /* cluster */
st_dword(buf + SZDIRE * 1 + 24, szb_bit); /* size */