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Use Adler32 instead of QT qChecksum for checksum of Japanese rom name.

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This commit is contained in:
Sergey Lipskiy 2015-04-09 15:55:30 +06:00
parent 208fea0442
commit 5f8d720916
1 changed files with 28 additions and 1 deletions
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29
GLideNUI/Settings.cpp
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@ -176,6 +176,33 @@ void writeSettings(const QString & _strFileName)
settings.endGroup();
}
static
u32 Adler32(u32 crc, const void *buffer, u32 count)
{
register u32 s1 = crc & 0xFFFF;
register u32 s2 = (crc >> 16) & 0xFFFF;
int k;
const u8 *Buffer = (const u8*)buffer;
if (Buffer == NULL)
return 0;
while (count > 0) {
/* 5552 is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
k = (count < 5552 ? count : 5552);
count -= k;
while (k--) {
s1 += *Buffer++;
s2 += s1;
}
/* 65521 is the largest prime smaller than 65536 */
s1 %= 65521;
s2 %= 65521;
}
return (s2 << 16) | s1;
}
void loadCustomRomSettings(const QString & _strFileName, const char * _strRomName)
{
QSettings settings(_strFileName, QSettings::IniFormat);
@ -188,7 +215,7 @@ void loadCustomRomSettings(const QString & _strFileName, const char * _strRomNam
for (int i = 0; i < bytes.length() && bASCII; ++i)
bASCII = bytes.at(i) >= 0;
const QString romName = bASCII ? QString::fromLatin1(_strRomName) : QString::number(qChecksum(bytes.data(), bytes.length()), 16);
const QString romName = bASCII ? QString::fromLatin1(_strRomName) : QString::number(Adler32(0xFFFFFFFF, bytes.data(), bytes.length()), 16);
if (settings.childGroups().indexOf(romName) < 0)
return;