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  1. #include<stdio.h>
  2.  
  3. #define BUFSIZE 48
  4. #define NUMENCDATA 4
  5.  
  6. static const size_t sixbase = 0b111111;
  7. static const size_t eigbase = 0b11111111;
  8. static const char table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  9.  
  10. typedef struct _FMS {
  11.     size_t bytes;
  12.     size_t state;
  13. } FMS;
  14.  
  15. enum State { First = 1, Second = 2, Third = 3, Finish = 4 };
  16. static FMS initState = { 0, First };
  17.  
  18. void FMS_init(FMS *self) {
  19.     *self = initState;
  20. }
  21.  
  22. void FMS_stack(FMS *self, char c) {
  23.     size_t stack = (size_t)c;
  24.     switch (self->state) {
  25.         case First:
  26.             self->bytes = (stack << 16);
  27.             self->state = Second;
  28.             break;
  29.         case Second:
  30.             self->bytes = self->bytes | (stack << 8) ;
  31.             self->state = Third;
  32.             break;
  33.         case Third:
  34.             self->bytes = self->bytes | stack;
  35.             self->state = Finish;
  36.             break;
  37.         case Finish:
  38.             fprintf(stderr,"スタックがいっぱいです。\n");
  39.             break;
  40.     }
  41. }
  42.  
  43. void FMS_stackdata_encode_flush(FMS *self) {
  44.     char res[NUMENCDATA];
  45.     if(self->state == Finish) { 
  46.         for(size_t it = 0; it != NUMENCDATA; ++it) {
  47.             res[it] = table[(self->bytes & (sixbase << (18 - 6 * it))) >> (18 - 6 * it)];
  48.         }
  49.         fwrite(res, sizeof(char), NUMENCDATA, stdout);
  50.         *self = initState;
  51.     }
  52. }
  53.  
  54. void b64enc(FILE *fp) {
  55.     FMS fms;
  56.     FMS_init(&fms);
  57.     char buf[BUFSIZE];
  58.     size_t nread;
  59.     while((nread = fread(buf, sizeof(char), BUFSIZE, fp)) > 0) {
  60.         for(size_t it = 0; it != BUFSIZE; ++it) {
  61.             FMS_stack(&fms, buf[it]);
  62.             FMS_stackdata_encode_flush(&fms);
  63.         }
  64.         printf("\n");
  65.     }
  66. }
  67.  
  68. int main(void) {
  69.     FILE *fp;
  70.     if( fopen_s(&fp,"base64s.c", "rb") < 0) {
  71.         fprintf(stderr, "ファイルを開けませんでした!\n");
  72.         return 1;
  73.     }
  74.     b64enc(fp);
  75.     fclose(fp);
  76.     return 0;
  77. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
prog.c: In function ‘main’:
prog.c:70:9: warning: implicit declaration of function ‘fopen_s’; did you mean ‘fopen’? [-Wimplicit-function-declaration]
     if( fopen_s(&fp,"base64s.c", "rb") < 0) {
         ^~~~~~~
         fopen
At top level:
prog.c:7:21: warning: ‘eigbase’ defined but not used [-Wunused-const-variable=]
 static const size_t eigbase = 0b11111111;
                     ^~~~~~~
/usr/bin/ld: /home/yBWCa8/ccvT6PJ2.o: in function `main':
prog.c:(.text.startup+0x26): undefined reference to `fopen_s'
collect2: error: ld returned 1 exit status
stdout
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Standard output is empty
https://ideone.com/ddQPJy
language:
C (gcc 8.3)
created:
3 years ago
visibility:
secret

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