add shasum compatibility for '-a' option
				
					
				
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				@ -171,6 +171,27 @@ int main(int argc, char **argv)
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         argn++;
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         if(argn < argc) {
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            idx = find_hash(argv[argn]);
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            if (idx == -1) {
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               struct {
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                  const char* is;
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                  const char* should;
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               } shasum_compat[] =
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                     {
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                           { "1",        sha1_desc.name },
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                           { "224",      sha224_desc.name  },
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                           { "256",      sha256_desc.name  },
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                           { "384",      sha384_desc.name  },
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                           { "512",      sha512_desc.name  },
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                           { "512224",   sha512_224_desc.name  },
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                           { "512256",   sha512_256_desc.name  },
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                     };
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               for (x = 0; x < sizeof(shasum_compat)/sizeof(shasum_compat[0]); ++x) {
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                  if(XSTRCMP(shasum_compat[x].is, argv[argn]) == 0) {
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                     idx = find_hash(shasum_compat[x].should);
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                     break;
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                  }
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               }
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            }
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            if (idx == -1) {
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               fprintf(stderr, "\nInvalid hash (%s) specified on command line.\n", argv[2]);
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               die(EXIT_FAILURE);
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