Add HTTP Basic Auth to WebServer and libb64 (base64) to core

cores/esp8266/libb64/AUTHORS

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+libb64: Base64 Encoding/Decoding Routines
+======================================
+
+Authors:
+-------
+
+Chris Venter	chris.venter@gmail.com	http://rocketpod.blogspot.com

cores/esp8266/libb64/LICENSE

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+Copyright-Only Dedication (based on United States law) 
+or Public Domain Certification
+
+The person or persons who have associated work with this document (the
+"Dedicator" or "Certifier") hereby either (a) certifies that, to the best of
+his knowledge, the work of authorship identified is in the public domain of the
+country from which the work is published, or (b) hereby dedicates whatever
+copyright the dedicators holds in the work of authorship identified below (the
+"Work") to the public domain. A certifier, moreover, dedicates any copyright
+interest he may have in the associated work, and for these purposes, is
+described as a "dedicator" below.
+
+A certifier has taken reasonable steps to verify the copyright status of this
+work. Certifier recognizes that his good faith efforts may not shield him from
+liability if in fact the work certified is not in the public domain.
+
+Dedicator makes this dedication for the benefit of the public at large and to
+the detriment of the Dedicator's heirs and successors. Dedicator intends this
+dedication to be an overt act of relinquishment in perpetuity of all present
+and future rights under copyright law, whether vested or contingent, in the
+Work. Dedicator understands that such relinquishment of all rights includes
+the relinquishment of all rights to enforce (by lawsuit or otherwise) those
+copyrights in the Work.
+
+Dedicator recognizes that, once placed in the public domain, the Work may be
+freely reproduced, distributed, transmitted, used, modified, built upon, or
+otherwise exploited by anyone for any purpose, commercial or non-commercial,
+and in any way, including by methods that have not yet been invented or
+conceived.

cores/esp8266/libb64/cdecode.c

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+/*
+cdecoder.c - c source to a base64 decoding algorithm implementation
+
+This is part of the libb64 project, and has been placed in the public domain.
+For details, see http://sourceforge.net/projects/libb64
+*/
+
+#include "cdecode.h"
+
+int base64_decode_value(char value_in){
+  static const char decoding[] = {62,-1,-1,-1,63,52,53,54,55,56,57,58,59,60,61,-1,-1,-1,-2,-1,-1,-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1,-1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51};
+  static const char decoding_size = sizeof(decoding);
+  value_in -= 43;
+  if (value_in < 0 || value_in > decoding_size) return -1;
+  return decoding[(int)value_in];
+}
+
+void base64_init_decodestate(base64_decodestate* state_in){
+  state_in->step = step_a;
+  state_in->plainchar = 0;
+}
+
+int base64_decode_block(const char* code_in, const int length_in, char* plaintext_out, base64_decodestate* state_in){
+  const char* codechar = code_in;
+  char* plainchar = plaintext_out;
+  char fragment;
+  
+  *plainchar = state_in->plainchar;
+  
+  switch (state_in->step){
+    while (1){
+      case step_a:
+        do {
+          if (codechar == code_in+length_in){
+            state_in->step = step_a;
+            state_in->plainchar = *plainchar;
+            return plainchar - plaintext_out;
+          }
+          fragment = (char)base64_decode_value(*codechar++);
+        } while (fragment < 0);
+        *plainchar    = (fragment & 0x03f) << 2;
+      case step_b:
+        do {
+          if (codechar == code_in+length_in){
+            state_in->step = step_b;
+            state_in->plainchar = *plainchar;
+            return plainchar - plaintext_out;
+          }
+          fragment = (char)base64_decode_value(*codechar++);
+        } while (fragment < 0);
+        *plainchar++ |= (fragment & 0x030) >> 4;
+        *plainchar    = (fragment & 0x00f) << 4;
+      case step_c:
+        do {
+          if (codechar == code_in+length_in){
+            state_in->step = step_c;
+            state_in->plainchar = *plainchar;
+            return plainchar - plaintext_out;
+          }
+          fragment = (char)base64_decode_value(*codechar++);
+        } while (fragment < 0);
+        *plainchar++ |= (fragment & 0x03c) >> 2;
+        *plainchar    = (fragment & 0x003) << 6;
+      case step_d:
+        do {
+          if (codechar == code_in+length_in){
+            state_in->step = step_d;
+            state_in->plainchar = *plainchar;
+            return plainchar - plaintext_out;
+          }
+          fragment = (char)base64_decode_value(*codechar++);
+        } while (fragment < 0);
+        *plainchar++   |= (fragment & 0x03f);
+    }
+  }
+  /* control should not reach here */
+  return plainchar - plaintext_out;
+}
+
+int base64_decode_chars(const char* code_in, const int length_in, char* plaintext_out){
+  base64_decodestate _state;
+  base64_init_decodestate(&_state);
+  int len = base64_decode_block(code_in, length_in, plaintext_out, &_state);
+  if(len > 0) plaintext_out[len] = 0;
+  return len;
+}

cores/esp8266/libb64/cdecode.h

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+/*
+cdecode.h - c header for a base64 decoding algorithm
+
+This is part of the libb64 project, and has been placed in the public domain.
+For details, see http://sourceforge.net/projects/libb64
+*/
+
+#ifndef BASE64_CDECODE_H
+#define BASE64_CDECODE_H
+
+#define base64_decode_expected_len(n) ((n * 3) / 4)
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef enum {
+  step_a, step_b, step_c, step_d
+} base64_decodestep;
+
+typedef struct {
+  base64_decodestep step;
+  char plainchar;
+} base64_decodestate;
+
+void base64_init_decodestate(base64_decodestate* state_in);
+
+int base64_decode_value(char value_in);
+
+int base64_decode_block(const char* code_in, const int length_in, char* plaintext_out, base64_decodestate* state_in);
+
+int base64_decode_chars(const char* code_in, const int length_in, char* plaintext_out);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif /* BASE64_CDECODE_H */

cores/esp8266/libb64/cencode.c

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+/*
+cencoder.c - c source to a base64 encoding algorithm implementation
+
+This is part of the libb64 project, and has been placed in the public domain.
+For details, see http://sourceforge.net/projects/libb64
+*/
+
+#include "cencode.h"
+
+const int CHARS_PER_LINE = 72;
+
+void base64_init_encodestate(base64_encodestate* state_in){
+  state_in->step = step_A;
+  state_in->result = 0;
+  state_in->stepcount = 0;
+}
+
+char base64_encode_value(char value_in){
+  static const char* encoding = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+  if (value_in > 63) return '=';
+  return encoding[(int)value_in];
+}
+
+int base64_encode_block(const char* plaintext_in, int length_in, char* code_out, base64_encodestate* state_in){
+  const char* plainchar = plaintext_in;
+  const char* const plaintextend = plaintext_in + length_in;
+  char* codechar = code_out;
+  char result;
+  char fragment;
+  
+  result = state_in->result;
+  
+  switch (state_in->step){
+    while (1){
+  case step_A:
+      if (plainchar == plaintextend){
+        state_in->result = result;
+        state_in->step = step_A;
+        return codechar - code_out;
+      }
+      fragment = *plainchar++;
+      result = (fragment & 0x0fc) >> 2;
+      *codechar++ = base64_encode_value(result);
+      result = (fragment & 0x003) << 4;
+  case step_B:
+      if (plainchar == plaintextend){
+        state_in->result = result;
+        state_in->step = step_B;
+        return codechar - code_out;
+      }
+      fragment = *plainchar++;
+      result |= (fragment & 0x0f0) >> 4;
+      *codechar++ = base64_encode_value(result);
+      result = (fragment & 0x00f) << 2;
+  case step_C:
+      if (plainchar == plaintextend){
+        state_in->result = result;
+        state_in->step = step_C;
+        return codechar - code_out;
+      }
+      fragment = *plainchar++;
+      result |= (fragment & 0x0c0) >> 6;
+      *codechar++ = base64_encode_value(result);
+      result  = (fragment & 0x03f) >> 0;
+      *codechar++ = base64_encode_value(result);
+      
+      ++(state_in->stepcount);
+      if (state_in->stepcount == CHARS_PER_LINE/4){
+        *codechar++ = '\n';
+        state_in->stepcount = 0;
+      }
+    }
+  }
+  /* control should not reach here */
+  return codechar - code_out;
+}
+
+int base64_encode_blockend(char* code_out, base64_encodestate* state_in){
+  char* codechar = code_out;
+  
+  switch (state_in->step){
+  case step_B:
+    *codechar++ = base64_encode_value(state_in->result);
+    *codechar++ = '=';
+    *codechar++ = '=';
+    break;
+  case step_C:
+    *codechar++ = base64_encode_value(state_in->result);
+    *codechar++ = '=';
+    break;
+  case step_A:
+    break;
+  }
+  *codechar = 0x00;
+  
+  return codechar - code_out;
+}
+
+int base64_encode_chars(const char* plaintext_in, int length_in, char* code_out){
+  base64_encodestate _state;
+  base64_init_encodestate(&_state);
+  int len = base64_encode_block(plaintext_in, length_in, code_out, &_state);
+  return len + base64_encode_blockend((code_out + len), &_state);
+}

cores/esp8266/libb64/cencode.h

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+/*
+cencode.h - c header for a base64 encoding algorithm
+
+This is part of the libb64 project, and has been placed in the public domain.
+For details, see http://sourceforge.net/projects/libb64
+*/
+
+#ifndef BASE64_CENCODE_H
+#define BASE64_CENCODE_H
+
+#define base64_encode_expected_len(n) ((((4 * n) / 3) + 3) & ~3)
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef enum {
+  step_A, step_B, step_C
+} base64_encodestep;
+
+typedef struct {
+  base64_encodestep step;
+  char result;
+  int stepcount;
+} base64_encodestate;
+
+void base64_init_encodestate(base64_encodestate* state_in);
+
+char base64_encode_value(char value_in);
+
+int base64_encode_block(const char* plaintext_in, int length_in, char* code_out, base64_encodestate* state_in);
+
+int base64_encode_blockend(char* code_out, base64_encodestate* state_in);
+
+int base64_encode_chars(const char* plaintext_in, int length_in, char* code_out);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif /* BASE64_CENCODE_H */