ajout librairie

base64.c

+/*****************************************
+*  Nom:                  base64.c        *
+*  Auteur:               Nicolas CAPACES *
+*  Date de Creation:     19/05/2024      *
+*  Date de Modification: 20/05/2024      *
+*****************************************/
+
+#include <sys/types.h>
+#include <stdint.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <base64.h>
+
+#include <stdio.h>
+
+const char pad = '=';
+
+size_t base64_encoded_size(size_t binlen){
+  size_t ret;
+
+  ret = binlen;
+  if (binlen % 3 != 0)
+    ret += 3 - (binlen % 3);
+  ret /= 3;
+  ret *= 4;
+
+  return ret;
+}
+
+int bin_to_base64(const char* src, size_t len_src, char* dst, size_t len_dst, enum64 charset){
+  size_t  i;
+  size_t  j;
+  size_t  v;
+  char* used_set;
+
+  if (src == NULL || len_src == 0 || len_dst == 0)
+    return -1;
+
+  if (charset == STANDARD){
+    used_set="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+  } else if (charset == URL){
+    used_set= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
+  } else {
+    return -1;
+  }
+  
+  dst = malloc(len_dst);
+  dst[len_dst] = '\0';
+
+  for (i=0, j=0; i<len_src; i+=3, j+=4) {
+    v = src[i];
+    v = i+1 < len_src ? v << 8 | src[i+1] : v << 8;
+    v = i+2 < len_src ? v << 8 | src[i+2] : v << 8;
+
+    dst[j]   = used_set[(v >> 18) & 0x3F];
+    dst[j+1] = used_set[(v >> 12) & 0x3F];
+    if (i+1 < len_src) {
+      dst[j+2] = used_set[(v >> 6) & 0x3F];
+    } else {
+    dst[j+2] = pad;
+    }
+    if (i+2 < len_src) {
+      dst[j+3] = used_set[v & 0x3F];
+    } else {
+      dst[j+3] = pad;
+    }
+  }
+
+  return 0;
+}

base64.h

+/*****************************************
+*  Nom:                  base64.h        *
+*  Auteur:               Nicolas CAPACES *
+*  Date de Creation:     19/05/2024      *
+*  Date de Modification: 20/05/2024      *
+*****************************************/
+
+#ifndef BASE_64_H_
+#define BASE_64_H_
+
+#include <sys/types.h>
+#include <stdint.h>
+
+extern const char standb64[];
+extern const char URLb64[];
+extern const char pad;
+
+typedef enum {
+  STANDARD,
+  URL
+}enum64;
+
+//TODO: implementer le décodage
+extern int bin_to_base64(const char* src, size_t len_src, char* dst, size_t len_dst, enum64 charset);
+//extern int base64_to_bin(const char* src, size_t len_src, char* dst, size_t len_dst, enum64 charset);
+
+extern size_t base64_encoded_size(size_t binlen);
+//extern size_t base64_decoded_size(size_t base64len);
+
+
+#endif /*base64.h*/