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| author | Dave Sparks <davidsparks@android.com> | 2009-08-25 18:01:18 -0700 |
|---|---|---|
| committer | Dave Sparks <davidsparks@android.com> | 2009-08-25 18:01:18 -0700 |
| commit | f198281e8a0b62addc8f5304ba20983feda9f905 (patch) | |
| tree | 568e82009b7d4e9f69435e8b1503ebdd8d5cb7c3 /arm-wt-22k/lib_src/eas_imelody.c | |
| parent | 56c99cd2c2c1e6ab038dac5fced5b92ccf11ff6c (diff) | |
| download | android_external_sonivox-f198281e8a0b62addc8f5304ba20983feda9f905.tar.gz android_external_sonivox-f198281e8a0b62addc8f5304ba20983feda9f905.tar.bz2 android_external_sonivox-f198281e8a0b62addc8f5304ba20983feda9f905.zip | |
Fix infinite loop issue with correctly formed, but useless iMelody files (bug 2068782).
It is possible to construct a legitimate iMelody file that consists of only control
commands such as ledon, ledoff, etc. in an infinite loop. If there are no notes or
rests in the file, the iMelody parser will spin in an infinite loop sucking as many
CPU cycles as it can get. This fix ignores loops that contain no notes or rests since
they make no sense. The controls will be processed, but the loop will only execute
once.
Diffstat (limited to 'arm-wt-22k/lib_src/eas_imelody.c')
| -rw-r--r-- | arm-wt-22k/lib_src/eas_imelody.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/arm-wt-22k/lib_src/eas_imelody.c b/arm-wt-22k/lib_src/eas_imelody.c index bf4375f..05380e5 100644 --- a/arm-wt-22k/lib_src/eas_imelody.c +++ b/arm-wt-22k/lib_src/eas_imelody.c @@ -396,6 +396,9 @@ static EAS_RESULT IMY_Event (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_I { pData->repeatOffset = pData->startLine + (EAS_I32) pData->index; + /* save current time and check it later to make sure the loop isn't zero length */ + pData->repeatTime = pData->time; + #ifdef _DEBUG_IMELODY { /* dpp: EAS_ReportEx(_EAS_SEVERITY_DETAIL, "Repeat offset = %d\n", pData->repeatOffset); */ } #endif @@ -410,9 +413,11 @@ static EAS_RESULT IMY_Event (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_I #ifdef _DEBUG_IMELODY { /* dpp: EAS_ReportEx(_EAS_SEVERITY_DETAIL, "End repeat section, repeat offset = %d\n", pData->repeatOffset); */ } #endif - /* ignore invalid repeats */ - if (pData->repeatCount >= 0) - { + /* ignore zero-length loops */ + if (pData->repeatTime == pData->time) { + pData->repeatCount = -1; + pData->repeatOffset = -1; + } else if (pData->repeatCount >= 0) { /* decrement repeat count (repeatCount == 0 means infinite loop) */ if (pData->repeatCount > 0) |