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Imported from pngcrush-1.5.8.tar

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This commit is contained in:
Glenn Randers-Pehrson
2001-12-12 18:01:38 -06:00
parent f671d863fe
commit 2eb0852fd6
22 changed files with 323 additions and 208 deletions
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5
pngvcrd.c
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@@ -2,7 +2,7 @@
*
* For Intel x86 CPU and Microsoft Visual C++ compiler
*
* libpng 1.2.0 - September 1, 2001
* libpng version 1.2.1 - December 12, 2001
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2001 Glenn Randers-Pehrson
* Copyright (c) 1998, Intel Corporation
@@ -39,6 +39,7 @@ png_mmx_support(void)
push ebx //CPUID will trash these
push ecx
push edx
pushfd //Save Eflag to stack
pop eax //Get Eflag from stack into eax
mov ecx, eax //Make another copy of Eflag in ecx
@@ -48,6 +49,8 @@ png_mmx_support(void)
popfd //Restored modified value back to Eflag reg
pushfd //Save Eflag to stack
pop eax //Get Eflag from stack
push ecx // save original Eflag to stack
popfd // restore original Eflag
xor eax, ecx //Compare the new Eflag with the original Eflag
jz NOT_SUPPORTED //If the same, CPUID instruction is not supported,
//skip following instructions and jump to