read of mingw: unknown error

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本文探讨了在Dalvik环境中优化文件读取的方法，特别是针对DEX文件的处理过程。通过在打开文件时增加_O_BINARY标志，解决了因默认文本模式导致的数据不一致问题，确保了DEX文件的正确解析。

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C:\MinGW-4.7.1\include\fcntl.h

#define _O_BINARY 0x8000 /* Input and output is not translated. */

http://www.ixpub.net/thread-1450177-1-1.html

d:\linux\linuxkernel\WORKING_DIRECTORY\android-omap-20111108-gingerbread\dalvik\libdex\ZipArchive.c

int dexZipOpenArchive(const char* fileName, ZipArchive* pArchive)
{
...
// fd = open(fileName, O_RDONLY, 0);
fd = open(fileName, O_RDONLY|_O_BINARY, 0);
make mingw open the file in BINARY

0 0x65741847 __android_log_print d:/linux/linuxkernel/WORKING_DIRECTORY/android-omap-20111108-gingerbread/system/core/liblog/logd_write.c 209

1 0x0056a4e5 dexSwapAndVerify d:/linux/linuxkernel/WORKING_DIRECTORY/android-omap-20111108-gingerbread/dalvik/libdex/DexSwapVerify.c 2805
2 0x0052ebe2 rewriteDex d:/linux/linuxkernel/WORKING_DIRECTORY/android-omap-20111108-gingerbread/dalvik/vm/analysis/DexPrepare.c 736
3 0x0052e72f dvmContinueOptimization d:/linux/linuxkernel/WORKING_DIRECTORY/android-omap-20111108-gingerbread/dalvik/vm/analysis/DexPrepare.c 574
4 0x0040205f fromDex d:/linux/linuxkernel/WORKING_DIRECTORY/android-omap-20111108-gingerbread/dalvik/dexopt/OptMain.c 538
5 0x00402188 dexoptmain d:/linux/linuxkernel/WORKING_DIRECTORY/android-omap-20111108-gingerbread/dalvik/dexopt/OptMain.c 597
6 0x00401330 main d:/linux/linuxkernel/WORKING_DIRECTORY/ango/dexopt/main.c 8
D:\linux\linuxkernel\WORKING_DIRECTORY\android-omap-20111108-gingerbread\dalvik\libdex\DexFile.h
/* DEX file magic number */
#define DEX_MAGIC "dex\n"
d:\linux\linuxkernel\WORKING_DIRECTORY\android-omap-20111108-gingerbread\dalvik\libdex\DexSwapVerify.c
pHeader->magic[0], pHeader->magic[1],
pHeader->magic[2], pHeader->magic[3]);
=0x64 65 78 0d

2013-02-18 20:10 702,117 system@framework@bouncycastle.jar@classes.dex
2013-02-18 20:10 4,305,857 system@framework@core.jar@classes.dex
the size of system@framework@bouncycastle.jar@classes.dex should be 693920, because it's open in text mode by default, so the 0x0a is changed to 0d0a

d:\linux\linuxkernel\WORKING_DIRECTORY\android-omap-20111108-gingerbread\dalvik\vm\analysis\DexPrepare.c
// fd = createIfMissing ? open(cacheFileName, O_CREAT|O_RDWR, 0644) : -1;
fd = createIfMissing ? open(cacheFileName, O_CREAT|O_RDWR|_O_BINARY, 0644) : -1;

d:\linux\linuxkernel\WORKING_DIRECTORY\android-omap-20111108-gingerbread\dalvik\dexopt\OptMain.c
// fd = open(cachedName, O_CREAT|O_RDWR, 0644);
fd = open(cachedName, O_CREAT|O_RDWR|_O_BINARY, 0644);