Apple-2-Tools/AppleWin
1
0
Fork 0
mirror of https://github.com/AppleWin/AppleWin.git synced 2025-04-10 15:39:06 +00:00
Code Issues Projects Releases Wiki Activity

Add utility to test if block is sparse

Browse Source
This commit is contained in:
michaelangel007 2025-02-08 20:22:46 -08:00
parent 82298a0683
commit fc41d770e5
1 changed files with 22 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
source/Windows/WinFrame.cpp
View File

@ -2306,6 +2306,28 @@ void Util_ProDOS_FormatFileSystem (uint8_t *pDiskBytes, const size_t nDiskSize,
ProDOS_SetVolumeHeader( pDiskBytes, pVolume, PRODOS_ROOT_BLOCK );
}
// See:
// * https://prodos8.com/docs/technote/30/
// * 2.2.3 Sparse Files
// https://prodos8.com/docs/techref/file-use/
// * B.3.6 - Sparse Files
// https://prodos8.com/docs/techref/file-organization/
//===========================================================================
bool Util_BlockIsSparse( int nOffset, const uint8_t* pFileData, const size_t nFileSize )
{
const int nEnd = (nOffset + PRODOS_BLOCK_SIZE ) >= nFileSize
? nOffset + (nFileSize % PRODOS_BLOCK_SIZE)
: nOffset + PRODOS_BLOCK_SIZE;
for (int iOffset = nOffset ; iOffset < nEnd; iOffset++ )
{
if (pFileData[ iOffset ])
{
return false;
}
}
return true;
}
//===========================================================================
bool Util_ProDOS_AddFile (uint8_t* pDiskBytes, const size_t nDiskSize, const char* pVolumeName, const uint8_t* pFileData, const size_t nFileSize, ProDOS_FileHeader_t &meta)
{