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SDFile - fix errorneous offset computation

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... my fault, I was originally too optimistic about the overflow

Fixes #3077

PFW-1233
This commit is contained in:
D.R.racer 2021-03-29 12:21:42 +02:00 committed by DRracer
parent a251dcc14e
commit cdcc06f376
1 changed files with 8 additions and 5 deletions
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13
Firmware/SdFile.cpp
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@ -178,14 +178,17 @@ eof_or_fail:
}
bool SdFile::gfEnsureBlock(){
if ( vol_->cacheRawBlock(gfBlock, SdVolume::CACHE_FOR_READ)){
// this comparison is heavy-weight, especially when there is another one inside cacheRawBlock
// but it is necessary to avoid computing of terminateOfs if not needed
if( gfBlock != vol_->cacheBlockNumber_ ){
if ( ! vol_->cacheRawBlock(gfBlock, SdVolume::CACHE_FOR_READ)){
return false;
}
// terminate with a '\n'
const uint16_t terminateOfs = fileSize_ - gfOffset;
const uint32_t terminateOfs = fileSize_ - gfOffset;
vol_->cache()->data[ terminateOfs < 512 ? terminateOfs : 512 ] = '\n';
return true;
} else {
return false;
}
return true;
}
bool SdFile::gfComputeNextFileBlock() {