Android系统file_contexts二进制与文本转换工具

 #ifdef _WIN32
     #define __USE_MINGW_ANSI_STDIO 1
 #endif

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
 #include <fcntl.h>
 #ifdef HAS_STDINT_H
     #include <stdint.h>
 #endif
 #ifdef unix
     #include <unistd.h>
     #include <sys/types.h>
     #include <sys/stat.h>
 #else
     #include <direct.h>
     #include <io.h>
 #endif

 #define MAGIC 0xF97CFF8A

 #define S_IFMT      00170000
 #define S_IFSOCK    0140000
 #define S_IFLNK        0120000
 #define S_IFREG        0100000
 #define S_IFBLK        0060000
 #define S_IFDIR        0040000
 #define S_IFCHR        0020000
 #define S_IFIFO        0010000
 #define S_ISUID        0004000
 #define S_ISGID        0002000
 #define S_ISVTX        0001000

 #define S_ISLNK(m)    (((m) & S_IFMT) == S_IFLNK)
 #define S_ISREG(m)    (((m) & S_IFMT) == S_IFREG)
 #define S_ISDIR(m)    (((m) & S_IFMT) == S_IFDIR)
 #define S_ISCHR(m)    (((m) & S_IFMT) == S_IFCHR)
 #define S_ISBLK(m)    (((m) & S_IFMT) == S_IFBLK)
 #define S_ISFIFO(m)    (((m) & S_IFMT) == S_IFIFO)
 #define S_ISSOCK(m)    (((m) & S_IFMT) == S_IFSOCK)

 char *mode_to_string(unsigned int mode)
 {
     if (S_ISBLK(mode))
         return "-b";
     else if (S_ISCHR(mode))
         return "-c";
     else if (S_ISDIR(mode))
         return "-d";
     else if (S_ISFIFO(mode))
         return "-p";
     else if (S_ISLNK(mode))
         return "-l";
     else if (S_ISSOCK(mode))
         return "-s";
     else if (S_ISREG(mode))
         return "--";
     else
         return "";
 }

 int main(int argc, char *argv[])
 {
     unsigned int selinux_vers;
     unsigned int nothing;
     unsigned int i;
     unsigned int steams;
     unsigned int num_of_regex;

     char steam[];
     char src[];
     char context[];

     FILE *fp = NULL;
     FILE *fpout = NULL;

     if (argc != ) {
         printf("usage: %s BINARY_FILE OUTPUT_TEXT_FILE\n", argv[]);
         printf("e.g: %s file_contexts.bin file_contexts\n", argv[]);
         return ;
     }

     if ((fp = fopen(argv[], "rb")) == NULL) {
         printf("Unable to open %s : ", argv[]);
         perror("");
         return ;
     }
     fread(&nothing, , , fp);
     if (nothing != MAGIC) {
         printf("%s is not a binary!\n", argv[]);
         if (fp) fclose(fp);
         return ;
     }

     fread(&nothing, , , fp);
   selinux_vers = nothing;
     fread(&nothing, , , fp);
     fseek(fp, (unsigned int)ftell(fp) + nothing, SEEK_SET);

     fread(&nothing, , , fp);
     //printf("num of steams: 0x%x\n", nothing);

     for (i=; i<nothing; ++i) {
         fread(&steams, , , fp);
       fread(steam, , steams+, fp);
         //printf("%s\n", steam);
     }

     fread(&num_of_regex, , , fp);
     //printf("num of regex: 0x%x\n", num_of_regex);

     if ((fpout = fopen(argv[], "wb")) == NULL) {
         printf("unable to open %s for write!\n", argv[]);
         if (fp) fclose(fp);
         return ;
     }

   //printf("selinux version: %d\n", selinux_vers);
   fprintf(fpout, "#context version %d\n", selinux_vers);

     for (i=; i<num_of_regex; ++i) {
         fread(&nothing, , , fp);
       fread(context, , nothing, fp);
     fread(&nothing, , , fp);
     fread(src, , nothing, fp);
         //printf("%s %s\n", src, context);
         fread(&nothing, , , fp);
         fprintf(fpout, "%s\t%s\t%s\n", src, mode_to_string(nothing), context);
       fseek(fp, (unsigned int)ftell(fp) + , SEEK_SET);
         fread(&nothing, , , fp);
     fseek(fp, (unsigned int)ftell(fp) + nothing, SEEK_SET);
         fread(&nothing,  , , fp);
     fread(&nothing,  , , fp);
     fseek(fp, (unsigned int)ftell(fp) + nothing - , SEEK_SET);
     }

     if (fp) fclose(fp);
     if (fpout) fclose(fpout);

     return ;
 }