✨ feat(integrate utable): deps/utable

deps/base64/encode.c

@@ -0,0 +1,93 @@
+
+/**
+ * `encode.c' - b64
+ *
+ * copyright (c) 2014 joseph werle
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "b64.h"
+
+#ifdef b64_USE_CUSTOM_MALLOC
+extern void* b64_malloc(size_t);
+#endif
+
+#ifdef b64_USE_CUSTOM_REALLOC
+extern void* b64_realloc(void*, size_t);
+#endif
+
+char *
+b64_encode (const unsigned char *src, size_t len) {
+  int i = 0;
+  int j = 0;
+  b64_buffer_t encbuf;
+  size_t size = 0;
+  unsigned char buf[4];
+  unsigned char tmp[3];
+
+  // alloc
+  if(b64_buf_malloc(&encbuf) == -1) { return NULL; }
+
+  // parse until end of source
+  while (len--) {
+    // read up to 3 bytes at a time into `tmp'
+    tmp[i++] = *(src++);
+
+    // if 3 bytes read then encode into `buf'
+    if (3 == i) {
+      buf[0] = (tmp[0] & 0xfc) >> 2;
+      buf[1] = ((tmp[0] & 0x03) << 4) + ((tmp[1] & 0xf0) >> 4);
+      buf[2] = ((tmp[1] & 0x0f) << 2) + ((tmp[2] & 0xc0) >> 6);
+      buf[3] = tmp[2] & 0x3f;
+
+      // allocate 4 new byts for `enc` and
+      // then translate each encoded buffer
+      // part by index from the base 64 index table
+      // into `encbuf.ptr' unsigned char array
+      if (b64_buf_realloc(&encbuf, size + 4) == -1) return NULL;
+
+      for (i = 0; i < 4; ++i) {
+        encbuf.ptr[size++] = b64_table[buf[i]];
+      }
+
+      // reset index
+      i = 0;
+    }
+  }
+
+  // remainder
+  if (i > 0) {
+    // fill `tmp' with `\0' at most 3 times
+    for (j = i; j < 3; ++j) {
+      tmp[j] = '\0';
+    }
+
+    // perform same codec as above
+    buf[0] = (tmp[0] & 0xfc) >> 2;
+    buf[1] = ((tmp[0] & 0x03) << 4) + ((tmp[1] & 0xf0) >> 4);
+    buf[2] = ((tmp[1] & 0x0f) << 2) + ((tmp[2] & 0xc0) >> 6);
+    buf[3] = tmp[2] & 0x3f;
+
+    // perform same write to `encbuf->ptr` with new allocation
+    for (j = 0; (j < i + 1); ++j) {
+      if (b64_buf_realloc(&encbuf, size + 1) == -1) return NULL;
+
+      encbuf.ptr[size++] = b64_table[buf[j]];
+    }
+
+    // while there is still a remainder
+    // append `=' to `encbuf.ptr'
+    while ((i++ < 3)) {
+      if (b64_buf_realloc(&encbuf, size + 1) == -1) return NULL;
+
+      encbuf.ptr[size++] = '=';
+    }
+  }
+
+  // Make sure we have enough space to add '\0' character at end.
+  if (b64_buf_realloc(&encbuf, size + 1) == -1) return NULL;
+  encbuf.ptr[size] = '\0';
+
+  return encbuf.ptr;
+}