zlib 在 Visual Studio 2005 下编译失败的解决办法

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最近需要读写 png 文件，按照以前的办法试验，却发现无法编译zlib 1.2.3。出错信息为：

inffas32.asm(594) : error A2070: invalid instruction operands
inffas32.asm(596) : error A2070: invalid instruction operands
inffas32.asm(610) : error A2070: invalid instruction operands
inffas32.asm(667) : error A2070: invalid instruction operands

上网一查，发现别人也遇到相同的问题：http://svn.haxx.se/dev/archive-2005-11/0942.shtml。原因在于

It (Microsoft Macro Assembler 8.0, included with Visual C++ 2005 Express )refuses to assemble a MOVD instruction with a memory operand with an implied size, and requires that "dword ptr" prefix the memory operand.

微软说这是by design，不是bug：

http://lab.msdn.microsoft.com/productfeedback/viewfeedback.aspx?feedbackid=6306f7dc-2cc2-4591-bd60-5d802178fdfa

解决办法是把inffas32.asm中的4处出错的类似

movd mm4, [esp+0]

的汇编代码，添加dword ptr修饰符，改为

movd mm4,dword ptr [esp+0]

这样就能顺利编译、通过测试了。

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