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Fix for Win 3.x corrupt Group files in FAT image files #2381

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This is a fix for #2381.
Month ago joncampbell fixed a FAT image problem: scandisk detected file length errors in some created files.
But this fix creates a problem with corrupted GRP files in windows 3.1x installations (see #1758).

With this new patch both problems are gone: no file size and no group file problems anymore.

The creation and extension of windows 3.1x group files is weird:
It's done with multiple position and write commands, some of them are writings of 1 or zero bytes at all.
This commit is contained in:
SnikoLoft
2021-03-22 22:22:24 +01:00
committed by GitHub
parent 6f66922f8c
commit 57f476c0a7
1 changed files with 1 additions and 2 deletions
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3
src/dos/drive_fat.cpp
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@@ -440,10 +440,9 @@ bool fatFile::Write(const uint8_t * data, uint16_t *size) {
if(loadedSector) myDrive->writeSector(currentSector, sectorBuffer); if(loadedSector) myDrive->writeSector(currentSector, sectorBuffer);
loadedSector = false; loadedSector = false;
if (sizedec == 0) { curSectOff = 0; goto finalizeWrite; }
currentSector = myDrive->getAbsoluteSectFromBytePos(firstCluster, seekpos); currentSector = myDrive->getAbsoluteSectFromBytePos(firstCluster, seekpos);
if(currentSector == 0) { if(currentSector == 0) {
if (sizedec == 0) goto finalizeWrite;
/* EOC reached before EOF - try to increase file allocation */ /* EOC reached before EOF - try to increase file allocation */
myDrive->appendCluster(firstCluster); myDrive->appendCluster(firstCluster);
/* Try getting sector again */ /* Try getting sector again */