valter/dosbox-staging
1
0
Fork 0
Code Releases Activity

speed up fat drive access

Browse source 
Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3714
This commit is contained in:
Sebastian Strohhäcker 2011-05-28 20:26:12 +00:00
parent 379727f63d
commit 1887b2590b
4 changed files with 17 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

11
src/ints/bios_disk.cpp
View file

@ -149,8 +149,9 @@ Bit8u imageDisk::Read_AbsoluteSector(Bit32u sectnum, void * data) {
bytenum = sectnum * sector_size;
fseek(diskimg,bytenum,SEEK_SET);
fread(data, 1, sector_size, diskimg);
if (bytenum!=current_fpos) fseek(diskimg,bytenum,SEEK_SET);
size_t ret=fread(data, 1, sector_size, diskimg);
current_fpos=bytenum+ret;
return 0x00;
}
@ -161,7 +162,6 @@ Bit8u imageDisk::Write_Sector(Bit32u head,Bit32u cylinder,Bit32u sector,void * d
sectnum = ( (cylinder * heads + head) * sectors ) + sector - 1L;
return Write_AbsoluteSector(sectnum, data);
}
@ -172,8 +172,9 @@ Bit8u imageDisk::Write_AbsoluteSector(Bit32u sectnum, void *data) {
//LOG_MSG("Writing sectors to %ld at bytenum %d", sectnum, bytenum);
fseek(diskimg,bytenum,SEEK_SET);
if (bytenum!=current_fpos) fseek(diskimg,bytenum,SEEK_SET);
size_t ret=fwrite(data, sector_size, 1, diskimg);
current_fpos=bytenum+ret;
return ((ret>0)?0x00:0x05);
@ -184,7 +185,9 @@ imageDisk::imageDisk(FILE *imgFile, Bit8u *imgName, Bit32u imgSizeK, bool isHard
cylinders = 0;
sectors = 0;
sector_size = 512;
current_fpos = 0;
diskimg = imgFile;
fseek(diskimg,0,SEEK_SET);
memset(diskname,0,512);
if(strlen((const char *)imgName) > 511) {