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Change bit array to 7-bit LFSR logic

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This commit is contained in:
tomcw 2023-03-31 10:58:15 +01:00
parent 6162ba4c76
commit 7b8960177b
1 changed files with 18 additions and 12 deletions
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30
source/CopyProtectionDongles.cpp
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@ -38,12 +38,19 @@
static DONGLETYPE copyProtectionDongleType = DT_EMPTY;
static UINT codeWriterIndex = 0;
static BYTE codeWriterBits[127] = {
1,1,0,1,0,1,1,0,1,1,1,1,0,1,1,0,0,0,1,1,0,1,0,0,1,0,1,1,1,0,1,1,
1,0,0,1,1,0,0,1,0,1,0,1,0,1,1,1,1,1,1,1,0,0,0,0,0,0,1,0,0,0,0,0,
1,1,0,0,0,0,1,0,1,0,0,0,1,1,1,1,0,0,1,0,0,0,1,0,1,1,0,0,1,1,1,0,
1,0,1,0,0,1,1,1,1,1,0,1,0,0,0,0,1,1,1,0,0,0,1,0,0,1,0,0,1,1,0 };
static const BYTE codewriterInitialLFSR = 0x6B; // %1101011 (7-bit LFSR)
static BYTE codewriterLFSR = codewriterInitialLFSR;
static void codeWriterResetLFSR()
{
codewriterLFSR = codewriterInitialLFSR;
}
static void codeWriterClockLFSR()
{
BYTE bit = ((codewriterLFSR >> 1) ^ (codewriterLFSR >> 0)) & 1;
codewriterLFSR = (codewriterLFSR >> 1) | (bit << 6);
}
void SetCopyProtectionDongleType(DONGLETYPE type)
{
@ -66,9 +73,9 @@ void DongleControl(WORD address)
if (copyProtectionDongleType == DT_CODEWRITER)
{
if ((AN == 3 && state == false) || MemGetAnnunciator(3)) // reset?
codeWriterIndex = 0;
codeWriterResetLFSR();
else if (AN == 2 && state == false && MemGetAnnunciator(2) == true) // AN2 true->false edge?
codeWriterIndex = (codeWriterIndex + 1) % std::size(codeWriterBits);
codeWriterClockLFSR();
}
}
@ -98,10 +105,9 @@ int CopyProtectionDonglePB2(void)
{
case DT_SDSSPEEDSTAR: // Southwestern Data Systems DataKey for SpeedStar Applesoft Compiler
return SdsSpeedStar();
break;
case DT_CODEWRITER: // Dynatech Microsoftware / Cortechs Corp protection key for "CodeWriter"
return codeWriterBits[codeWriterIndex];
return codewriterLFSR & 1;
default:
return -1;
@ -137,7 +143,7 @@ void CopyProtectionDongleSaveSnapshot(YamlSaveHelper& yamlSaveHelper)
else if (copyProtectionDongleType == DT_CODEWRITER)
{
yamlSaveHelper.SaveString(SS_YAML_KEY_DEVICE, GetSnapshotStructName_CodeWriter());
yamlSaveHelper.SaveUint(SS_YAML_KEY_CODEWRITER_INDEX, codeWriterIndex);
yamlSaveHelper.SaveUint(SS_YAML_KEY_CODEWRITER_INDEX, codewriterLFSR);
}
else
{
@ -165,7 +171,7 @@ void CopyProtectionDongleLoadSnapshot(YamlLoadHelper& yamlLoadHelper, UINT versi
else if (device == GetSnapshotStructName_CodeWriter())
{
copyProtectionDongleType = DT_CODEWRITER;
codeWriterIndex = yamlLoadHelper.LoadUint(SS_YAML_KEY_CODEWRITER_INDEX);
codewriterLFSR = yamlLoadHelper.LoadUint(SS_YAML_KEY_CODEWRITER_INDEX);
}
else
{