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SSI263: fix potential buffer overrun & rename var so it's explicit that it is a byte-size

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This commit is contained in:
tomcw 2021-07-28 12:14:22 +01:00
parent 4375418506
commit 6a5017bf91
2 changed files with 10 additions and 10 deletions
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16
source/SSI263.cpp
View file

@ -307,7 +307,7 @@ void SSI263::Play(unsigned int nPhoneme)
{
if (!SSI263SingleVoice.bActive)
{
bool bRes = DSZeroVoiceBuffer(&SSI263SingleVoice, m_kDSBufferSize);
bool bRes = DSZeroVoiceBuffer(&SSI263SingleVoice, m_kDSBufferByteSize);
LogFileOutput("SSI263::Play: DSZeroVoiceBuffer(), res=%d\n", bRes ? 1 : 0);
if (!bRes)
return;
@ -471,7 +471,7 @@ void SSI263::Update(void)
//-------------
const UINT kMinBytesInBuffer = m_kDSBufferSize / 4; // 25% full
const UINT kMinBytesInBuffer = m_kDSBufferByteSize / 4; // 25% full
int nNumSamples = 0;
double updateInterval = 0.0;
@ -515,8 +515,8 @@ void SSI263::Update(void)
if (nNumSamples > 2 * nNumSamplesPerPeriod)
nNumSamples = 2 * nNumSamplesPerPeriod;
if (nNumSamples > m_kDSBufferSize)
nNumSamples = m_kDSBufferSize; // Clamp to prevent buffer overflow
if (nNumSamples > m_kDSBufferByteSize / sizeof(short))
nNumSamples = m_kDSBufferByteSize / sizeof(short); // Clamp to prevent buffer overflow
// if (nNumSamples)
// { /* Generate new sample data - ie. could merge from all the SSI263 sources */ }
@ -525,13 +525,13 @@ void SSI263::Update(void)
int nBytesRemaining = m_byteOffset - dwCurrentPlayCursor;
if (nBytesRemaining < 0)
nBytesRemaining += m_kDSBufferSize;
nBytesRemaining += m_kDSBufferByteSize;
// Calc correction factor so that play-buffer doesn't under/overflow
const int nErrorInc = SoundCore_GetErrorInc();
if (nBytesRemaining < kMinBytesInBuffer)
m_numSamplesError += nErrorInc; // < 0.25 of buffer remaining
else if (nBytesRemaining > m_kDSBufferSize / 2)
else if (nBytesRemaining > m_kDSBufferByteSize / 2)
m_numSamplesError -= nErrorInc; // > 0.50 of buffer remaining
else
m_numSamplesError = 0; // Acceptable amount of data in buffer
@ -636,7 +636,7 @@ void SSI263::Update(void)
if (FAILED(hr))
return;
m_byteOffset = (m_byteOffset + (DWORD)nNumSamples*sizeof(short)*m_kNumChannels) % m_kDSBufferSize;
m_byteOffset = (m_byteOffset + (DWORD)nNumSamples*sizeof(short)*m_kNumChannels) % m_kDSBufferByteSize;
//
@ -758,7 +758,7 @@ bool SSI263::DSInit(void)
// Create single SSI263 voice
//
HRESULT hr = DSGetSoundBuffer(&SSI263SingleVoice, DSBCAPS_CTRLVOLUME, m_kDSBufferSize, SAMPLE_RATE_SSI263, m_kNumChannels, "SSI263");
HRESULT hr = DSGetSoundBuffer(&SSI263SingleVoice, DSBCAPS_CTRLVOLUME, m_kDSBufferByteSize, SAMPLE_RATE_SSI263, m_kNumChannels, "SSI263");
LogFileOutput("SSI263::DSInit: DSGetSoundBuffer(), hr=0x%08X\n", hr);
if (FAILED(hr))
{

4
source/SSI263.h
View file

@ -95,8 +95,8 @@ private:
static const BYTE m_Votrax2SSI263[/*64*/];
static const unsigned short m_kNumChannels = 1;
static const DWORD m_kDSBufferSize = MAX_SAMPLES * sizeof(short) * m_kNumChannels;
short m_mixBufferSSI263[m_kDSBufferSize / sizeof(short)];
static const DWORD m_kDSBufferByteSize = MAX_SAMPLES * sizeof(short) * m_kNumChannels;
short m_mixBufferSSI263[m_kDSBufferByteSize / sizeof(short)];
VOICE SSI263SingleVoice;
//