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Replace base64 files with library. Major refactoring.

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This commit is contained in:
Markus Ransberger
2024-04-03 01:10:15 +02:00
parent ef6061fc21
commit 0543b9c0c7
9 changed files with 220 additions and 342 deletions
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2
include/animation_functions.h
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@@ -4,6 +4,8 @@
#include <Arduino.h>
#include "wordclock_constants.h"
extern bool spiral_direction; // Direction of sprial animation
enum Direction
{
RIGHT,

26
include/base64_wrapper.h
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@@ -1,26 +0,0 @@
/*
Copyright (C) 2016 Arturo Guadalupi. All right reserved.
This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
*/
#ifndef BASE64_WRAPPER_H
#define BASE64_WRAPPER_H
class Base64Class{
public:
int encode(char *output, char *input, int inputLength);
int decode(char * output, char * input, int inputLength);
int encodedLength(int plainLength);
int decodedLength(char * input, int inputLength);
private:
inline void fromA3ToA4(unsigned char * A4, unsigned char * A3);
inline void fromA4ToA3(unsigned char * A3, unsigned char * A4);
inline unsigned char lookupTable(char c);
};
extern Base64Class Base64;
#endif /* BASE64_WRAPPER_H */

4
include/led_matrix.h
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@@ -43,10 +43,10 @@ private:
// current representation of matrix as 2D array
uint32_t _current_grid[MATRIX_HEIGHT][MATRIX_WIDTH] = {0};
// target representation of minutes indicator leds
// target representation of minutes indicator LEDs
uint32_t _target_minute_indicators[4] = {0, 0, 0, 0};
// current representation of minutes indicator leds
// current representation of minutes indicator LEDs
uint32_t _current_minute_indicators[4] = {0, 0, 0, 0};
void _draw_on_matrix(float factor);

8
include/wordclock_constants.h
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@@ -67,4 +67,12 @@
#define MATRIX_WIDTH (11)
#define MATRIX_HEIGHT (11)
// NTP macros
#define BUILD_YEAR (__DATE__ + 7) /* Will expand to current year at compile time as string. */
#define NTP_MININUM_RX_YEAR (atoi(BUILD_YEAR) - 1) /* Will expand to current year at compile time minus one. */
#define NTP_MININUM_YEAR (1900) // NTP minimum year is 1900
#define NTP_MAX_UPDATE_TIME_US (500000) // 500ms max update time
#define NTP_NEXT_UPDATE_DELAY_US (10000000) // 10s delay time between updates
#define NTP_WATCHDOG_COUNTER_INIT (30) // Watchdog value, count of retries before restart
#endif /* WORDCLOCK_CONSTANTS_H */

19
include/wordclock_esp8266.h
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@@ -12,13 +12,9 @@
#define EEPROM_SIZE (sizeof(EepromLayout_st) / sizeof(uint8_t))
#define BUILD_YEAR (__DATE__ + 7) /* Will expand to current year at compile time as string. */
#define NTP_MININUM_RX_YEAR (atoi(BUILD_YEAR) - 1) /* Will expand to current year at compile time minus one. */
#define NTP_MININUM_YEAR (1900) // NTP minimum year is 1900
#define NTP_MAX_UPDATE_TIME_US (500000) // 500ms max update time
#define NTP_NEXT_UPDATE_DELAY_US (10000000) // 10s delay time between updates
#define NTP_WATCHDOG_COUNTER_INIT (30) // Watchdog value, count of retries before restart
// ----------------------------------------------------------------------------------
// TYPEDEFS
// ----------------------------------------------------------------------------------
typedef struct
{
int start_hour;
@@ -32,7 +28,7 @@ typedef struct
uint8_t red;
uint8_t green;
uint8_t blue;
uint8_t alpha;
uint8_t alpha; // note: unused
} Color_st;
typedef struct
@@ -62,12 +58,16 @@ typedef enum
NUM_STATES
} ClockState_en;
bool get_ntp_time(uint32 usec);
// ----------------------------------------------------------------------------------
// FUNCTIONS DECLARATIONS
// ----------------------------------------------------------------------------------
bool get_ntp_time(uint32 timeout);
String leading_zero2digit(int value);
uint8_t calculate_dynamic_brightness(uint8_t min_brightness, uint8_t max_brightness, int hours, int minutes, bool summertime);
uint8_t update_brightness(void);
void check_night_mode(void);
void check_wifi_status(void);
void cold_start_setup(void);
void draw_main_color(void);
void handle_button(void);
void handle_command(void);
@@ -75,6 +75,7 @@ void handle_current_state(void);
void handle_data_request(void);
void handle_led_direct(void);
void limit_value_ranges(void);
void log_data(void);
void log_time(tm local_time);
void ntp_time_update(uint32 max_update_time);
void on_state_entry(uint8_t state);

1
platformio.ini
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@@ -19,6 +19,7 @@ lib_deps =
adafruit/Adafruit BusIO@^1.15.0
adafruit/Adafruit NeoMatrix@^1.3.0
adafruit/Adafruit NeoPixel@^1.11.0
densaugeo/base64@^1.4.0
tzapu/WiFiManager@^0.16.0
[env:nodemcuv2]

2
src/matrix/animation_functions.cpp
View File

@@ -10,6 +10,8 @@ extern LEDMatrix led_matrix;
const int8_t dx[] = {1, -1, 0, 0};
const int8_t dy[] = {0, 0, -1, 1};
bool spiral_direction = false; // Direction of sprial animation
/**
* @brief Function to draw a spiral step (from center)
*

191
src/wordclock_esp8266.cpp
View File

@@ -26,6 +26,7 @@
#include <Adafruit_GFX.h> // https://github.com/adafruit/Adafruit-GFX-Library
#include <Adafruit_NeoMatrix.h> // https://github.com/adafruit/Adafruit_NeoMatrix
#include <Adafruit_NeoPixel.h> // NeoPixel library used to run the NeoPixel LEDs: https://github.com/adafruit/Adafruit_NeoPixel
#include <base64.hpp>
#include <EEPROM.h> //from ESP8266 Arduino Core (automatically installed when ESP8266 was installed via Boardmanager)
#include <ESP8266WebServer.h>
#include <ESP8266WiFi.h>
@@ -34,7 +35,6 @@
// own libraries
#include "animation_functions.h"
#include "base64_wrapper.h" // copied from https://github.com/Xander-Electronics/Base64
#include "led_matrix.h"
#include "littlefs_wrapper.h"
#include "ota_functions.h"
@@ -54,43 +54,43 @@ Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix(MATRIX_WIDTH, MATRIX_HEIGHT + 1,
NEO_GRB + NEO_KHZ800); // NeoMatrix
ESP8266WebServer webserver(HTTP_PORT); // Webserver
LEDMatrix led_matrix = LEDMatrix(&matrix, DEFAULT_BRIGHTNESS, &logger); // NeoMatrix wrapper
struct tm time_info; // Structure tm holds time information
time_t time_now; // Seconds since Epoch (1970) - UTC
// ----------------------------------------------------------------------------------
// STATIC VARIABLES
// ----------------------------------------------------------------------------------
// EEPROM values
static EepromLayout_st eeprom_buffer = {{0, 0, 0, 0}, {0U, 0U, 0U, false}, {0U, 0U, 0U, 0U}};
static Brightness_st *brightness_ps = &eeprom_buffer.brightness_values;
static Color_st *colors_ps = &eeprom_buffer.color_values;
static NightModeTimes_st *night_mode_times_ps = &eeprom_buffer.night_mode_times;
static Brightness_st *const brightness_ps = &eeprom_buffer.brightness_values;
static Color_st *const colors_ps = &eeprom_buffer.color_values;
static NightModeTimes_st *const night_mode_times_ps = &eeprom_buffer.night_mode_times;
// Games
static Pong pong = Pong(&led_matrix, &logger);
static Snake snake = Snake(&led_matrix, &logger);
static Tetris tetris = Tetris(&led_matrix, &logger);
static uint32 last_ntp_update_us = 0; // Time of last NTP update
static char strftime_buf[64]; // Time string buffer
// Time
static struct tm time_info; // Structure tm holds time information
static time_t time_now; // Seconds since Epoch (1970) - UTC
// NTP
static uint32 last_ntp_update_us = 0; // Time of last NTP update
// State variables
static bool flg_night_mode = false; // State of nightmode
static bool flg_reset_wifi_creds = false; // Used to reset stored wifi credentials
static bool spiral_direction = false;
static float filter_factor = DEFAULT_SMOOTHING_FACTOR; // Stores smoothing factor for led transition, value of 1 represents no smoothing.
static int watchdog_counter = 30; // Watchdog counter to trigger restart if NTP update was not possible 30 times in a row (5min)
static uint32 last_led_direct_us = 0; // Time of last direct LED command (=> fall back to normal mode after timeout)
static uint32_t heartbeat_counter = 0; // Heartbeat on-time in seconds
static uint32_t main_color_clock = colors_24bit[2]; // Color of the clock and digital clock
static uint32_t main_color_snake = colors_24bit[1]; // Color of the random snake animation
static uint8_t current_brightness = DEFAULT_BRIGHTNESS; // Current brightness of LEDs
static uint8_t current_state = (uint8_t)ST_CLOCK; // Stores current state
static const String state_names[NUM_STATES] = {"Clock", "DiClock", "Spiral", "Tetris", "Snake", "PingPong", "Hearts"};
static const uint32_t period_timings[NUM_STATES] = {PERIOD_CLOCK_UPDATE_US, PERIOD_CLOCK_UPDATE_US,
PERIOD_ANIMATION_US, PERIOD_TETRIS_US, PERIOD_SNAKE_US,
PERIOD_PONG_US, PERIOD_ANIMATION_US};
// Other variables
static uint32 last_led_direct_us = 0; // Time of last direct LED command (=> fall back to normal mode after timeout)
static uint32_t heartbeat_counter = 0; // Heartbeat on-time in seconds
// Quarterly brightness factor for dynamic brightness (4 quarters a 24 hours)
static const float qtly_brightness_factor[96] = {
// Const definitions
static const String state_names[NUM_STATES] = {"Clock", "DiClock", "Spiral", "Tetris", "Snake", "PingPong", "Hearts"}; // all clock states
static const float qtly_brightness_factor[96] = { // Quarterly brightness factor for dynamic brightness (4 quarters a 24 hours)
0.0f, 0.0f, 0.0f, 0.001f, 0.003f, 0.007f, 0.014f, 0.026f, 0.044f, 0.069f, 0.101f, 0.143f, 0.194f, 0.253f, 0.32f,
0.392f, 0.468f, 0.545f, 0.62f, 0.691f, 0.755f, 0.811f, 0.858f, 0.896f, 0.927f, 0.949f, 0.966f, 0.978f, 0.986f,
0.991f, 0.995f, 0.997f, 0.998f, 0.999f, 0.999f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f,
@@ -98,7 +98,9 @@ static const float qtly_brightness_factor[96] = {
0.998f, 0.997f, 0.995f, 0.991f, 0.986f, 0.978f, 0.966f, 0.949f, 0.927f, 0.896f, 0.858f, 0.811f, 0.755f, 0.691f,
0.62f, 0.545f, 0.468f, 0.392f, 0.32f, 0.253f, 0.194f, 0.143f, 0.101f, 0.069f, 0.044f, 0.026f, 0.014f, 0.007f,
0.003f, 0.001f, 0.0f, 0.0f};
static const uint32_t period_timings[NUM_STATES] = {PERIOD_CLOCK_UPDATE_US, PERIOD_CLOCK_UPDATE_US,
PERIOD_ANIMATION_US, PERIOD_TETRIS_US, PERIOD_SNAKE_US,
PERIOD_PONG_US, PERIOD_ANIMATION_US};
// ----------------------------------------------------------------------------------
// SETUP
// ----------------------------------------------------------------------------------
@@ -112,10 +114,10 @@ void setup()
Serial.println();
// Reset info
rst_info *resetInfo = ESP.getResetInfoPtr();
Serial.printf("Reset reason: %u\n", resetInfo->reason);
Serial.printf("Reset cause: %u\n", resetInfo->exccause);
Serial.printf("Reset address: %u\n", resetInfo->excvaddr);
rst_info *reset_info = ESP.getResetInfoPtr();
Serial.printf("Reset reason: %u\n", reset_info->reason);
Serial.printf("Reset cause: %u\n", reset_info->exccause);
Serial.printf("Reset address: %u\n", reset_info->excvaddr);
Serial.println();
// Init EEPROM
@@ -134,7 +136,7 @@ void setup()
led_matrix.setup_matrix();
led_matrix.set_current_limit(CURRENT_LIMIT_LED);
// Turn on minutes leds (blue)
// Turn on minutes LEDs (blue)
led_matrix.set_min_indicator(15, colors_24bit[6]);
led_matrix.draw_on_matrix_instant();
@@ -148,11 +150,12 @@ void setup()
// If you get here you have connected to the WiFi
Serial.printf("Connected, IP address: ");
Serial.println(WiFi.localIP());
// ESP8266 tries to reconnect automatically when the connection is lost
WiFi.setAutoReconnect(true);
WiFi.persistent(true);
// Turn off minutes leds
// Turn off minutes LEDs
led_matrix.set_min_indicator(15, 0);
led_matrix.draw_on_matrix_instant();
@@ -169,44 +172,10 @@ void setup()
// create UDP Logger to send logging messages via UDP multicast
logger = UDPLogger(WiFi.localIP(), LOGGER_MULTICAST_IP, LOGGER_MULTICAST_PORT, "Wordclock 2.0");
logger.log_string("Start program\n");
logger.log_string("Sketchname: " + String(__FILE__));
logger.log_string("Build: " + String(__TIMESTAMP__));
logger.log_string("IP: " + WiFi.localIP().toString());
logger.log_string("Reset Reason: " + ESP.getResetReason());
if (resetInfo->reason != REASON_SOFT_RESTART) // only if there was a cold start/hard reset
if (reset_info->reason != REASON_SOFT_RESTART) // only if there was a cold start/hard reset
{
// quickly test each LED
for (int16_t row = 0; row < MATRIX_HEIGHT; row++)
{
for (int16_t col = 0; col < MATRIX_WIDTH; col++)
{
matrix.fillScreen(0);
matrix.drawPixel(col, row, LEDMatrix::color_24_to_16bit(colors_24bit[2]));
matrix.show();
delay(10);
}
}
// clear Matrix
matrix.fillScreen(0);
matrix.show();
delay(200);
// display IP
uint8_t address = WiFi.localIP()[3];
led_matrix.print_char(1, 0, 'I', main_color_clock);
led_matrix.print_char(5, 0, 'P', main_color_clock);
led_matrix.print_number(0, 6, (address / 100), main_color_clock);
led_matrix.print_number(4, 6, (address / 10) % 10, main_color_clock);
led_matrix.print_number(8, 6, address % 10, main_color_clock);
led_matrix.draw_on_matrix_instant();
delay(2000);
// clear matrix
led_matrix.flush();
led_matrix.draw_on_matrix_instant();
cold_start_setup();
}
// setup NTP
@@ -230,12 +199,11 @@ void setup()
// Set range limits
limit_value_ranges();
logger.log_string("Nightmode starts at: " + String(night_mode_times_ps->start_hour) + ":" + String(night_mode_times_ps->start_min));
logger.log_string("Nightmode ends at: " + String(night_mode_times_ps->end_hour) + ":" + String(night_mode_times_ps->end_min));
// Update brightness
current_brightness = update_brightness();
logger.log_string("Brightness: " + String(((uint16_t)current_brightness * 100) / UINT8_MAX) + "%");
// Send logging data
log_data();
}
// ----------------------------------------------------------------------------------
@@ -305,31 +273,97 @@ void loop()
// ----------------------------------------------------------------------------------
// OTHER FUNCTIONS
// ----------------------------------------------------------------------------------
/**
* @brief Log information
*
*/
void log_data()
{
logger.log_string("Start program\n");
logger.log_string("Sketchname: " + String(__FILE__));
logger.log_string("Build: " + String(__TIMESTAMP__));
logger.log_string("IP: " + WiFi.localIP().toString());
logger.log_string("Reset Reason: " + ESP.getResetReason());
logger.log_string("Nightmode starts at: " + String(night_mode_times_ps->start_hour) + ":" + String(night_mode_times_ps->start_min));
logger.log_string("Nightmode ends at: " + String(night_mode_times_ps->end_hour) + ":" + String(night_mode_times_ps->end_min));
logger.log_string("Brightness: " + String(((uint16_t)current_brightness * 100) / UINT8_MAX) + "%");
}
/**
* @brief Test all LEDs and display IP address
*
*/
void cold_start_setup()
{
// quickly test each LED
for (int16_t row = 0; row < MATRIX_HEIGHT; row++)
{
for (int16_t col = 0; col < MATRIX_WIDTH; col++)
{
matrix.fillScreen(0);
matrix.drawPixel(col, row, LEDMatrix::color_24_to_16bit(colors_24bit[2]));
matrix.show();
delay(10);
}
}
// clear Matrix
matrix.fillScreen(0);
matrix.show();
delay(200);
// display IP
uint8_t address = WiFi.localIP()[3];
led_matrix.print_char(1, 0, 'I', main_color_clock);
led_matrix.print_char(5, 0, 'P', main_color_clock);
led_matrix.print_number(0, 6, (address / 100), main_color_clock);
led_matrix.print_number(4, 6, (address / 10) % 10, main_color_clock);
led_matrix.print_number(8, 6, address % 10, main_color_clock);
led_matrix.draw_on_matrix_instant();
delay(2000);
// clear matrix
led_matrix.flush();
led_matrix.draw_on_matrix_instant();
}
/**
* @brief Updates the NTP time
*
* @return boolean - true if NTP update was successful, false otherwise
*/
bool get_ntp_time(uint32 usec)
bool get_ntp_time(uint32 timeout)
{
uint32 start_time_us = system_get_time();
do
{
time(&time_now);
localtime_r(&time_now, &time_info);
delay(10);
} while (((system_get_time() - start_time_us) <= usec) && (time_info.tm_year < (NTP_MININUM_RX_YEAR - NTP_MININUM_YEAR)));
yield();
} while (((system_get_time() - start_time_us) <= timeout) && (time_info.tm_year < (NTP_MININUM_RX_YEAR - NTP_MININUM_YEAR)));
logger.log_string(String("NTP-Update duration: " + String(system_get_time() - start_time_us) + String("us")));
return ((time_info.tm_year <= (NTP_MININUM_RX_YEAR - NTP_MININUM_YEAR)) ? false : true);
}
/**
* @brief Log local_time.
*
* @param local_time
*/
void log_time(tm local_time)
{
char strftime_buf[64]; // Time string buffer
strftime(strftime_buf, sizeof(strftime_buf), "%c", &time_info);
logger.log_string(String(strftime_buf));
}
/**
* @brief Update and control word clock states.
*/
void handle_current_state()
{
switch (current_state)
@@ -350,14 +384,14 @@ void handle_current_state()
int res = draw_spiral(false, spiral_direction, MATRIX_WIDTH - 2);
if ((bool)res && spiral_direction == 0)
{
// change spiral direction to closing (draw empty leds)
// change spiral direction to closing (draw empty LEDs)
spiral_direction = true;
// init spiral with new spiral direction
draw_spiral(true, spiral_direction, MATRIX_WIDTH - 1);
}
else if (res && spiral_direction == 1)
{
// reset spiral direction to normal drawing leds
// reset spiral direction to normal drawing LEDs
spiral_direction = false;
// init spiral with new spiral direction
draw_spiral(true, spiral_direction, MATRIX_WIDTH - 1);
@@ -456,8 +490,8 @@ void check_night_mode()
*/
void ntp_time_update(uint32 max_update_time)
{
// NTP time update
bool ntp_retval = get_ntp_time(max_update_time);
static int watchdog_counter = NTP_WATCHDOG_COUNTER_INIT; // Watchdog counter to trigger restart if NTP update was not possible 30 times in a row (5min)
bool ntp_retval = get_ntp_time(max_update_time); // NTP time update
if (ntp_retval == true)
{
@@ -566,10 +600,9 @@ void handle_led_direct()
// base64 decoding
char base64data[dataLength];
data.toCharArray(base64data, dataLength);
int base64dataLen = (int)dataLength;
int decodedLength = Base64.decodedLength(base64data, base64dataLen);
char byteArray[decodedLength];
Base64.decode(byteArray, base64data, base64dataLen);
unsigned int decodedLength = decode_base64_length((unsigned char *)base64data, dataLength);
unsigned char byteArray[decodedLength];
decode_base64((unsigned char *)base64data, dataLength, byteArray);
for (unsigned int i = 0; i < dataLength; i += 4)
{
@@ -645,11 +678,11 @@ void handle_button()
void set_main_color(uint8_t red, uint8_t green, uint8_t blue)
{
main_color_clock = LEDMatrix::color_24bit(red, green, blue);
// Update colors and save color settings to EEPROM
colors_ps->blue = blue;
colors_ps->red = red;
colors_ps->green = green;
// save color settings to EEPROM
write_settings_to_EEPROM();
}

143
src/wrapper/base64_wrapper.cpp
View File

@@ -1,143 +0,0 @@
/*
Copyright (C) 2016 Arturo Guadalupi. All right reserved.
This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
*/
#include <Arduino.h>
#include "base64_wrapper.h"
#if (defined(__AVR__))
#include <avr/pgmspace.h>
#else
#include <pgmspace.h>
#endif
const char PROGMEM _Base64AlphabetTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
int Base64Class::encode(char *output, char *input, int inputLength) {
int i = 0, j = 0;
int encodedLength = 0;
unsigned char A3[3];
unsigned char A4[4];
while(inputLength--) {
A3[i++] = *(input++);
if(i == 3) {
fromA3ToA4(A4, A3);
for(i = 0; i < 4; i++) {
output[encodedLength++] = pgm_read_byte(&_Base64AlphabetTable[A4[i]]);
}
i = 0;
}
}
if(i) {
for(j = i; j < 3; j++) {
A3[j] = '\0';
}
fromA3ToA4(A4, A3);
for(j = 0; j < i + 1; j++) {
output[encodedLength++] = pgm_read_byte(&_Base64AlphabetTable[A4[j]]);
}
while((i++ < 3)) {
output[encodedLength++] = '=';
}
}
output[encodedLength] = '\0';
return encodedLength;
}
int Base64Class::decode(char * output, char * input, int inputLength) {
int i = 0, j = 0;
int decodedLength = 0;
unsigned char A3[3];
unsigned char A4[4];
while (inputLength--) {
if(*input == '=') {
break;
}
A4[i++] = *(input++);
if (i == 4) {
for (i = 0; i <4; i++) {
A4[i] = lookupTable(A4[i]);
}
fromA4ToA3(A3,A4);
for (i = 0; i < 3; i++) {
output[decodedLength++] = A3[i];
}
i = 0;
}
}
if (i) {
for (j = i; j < 4; j++) {
A4[j] = '\0';
}
for (j = 0; j <4; j++) {
A4[j] = lookupTable(A4[j]);
}
fromA4ToA3(A3,A4);
for (j = 0; j < i - 1; j++) {
output[decodedLength++] = A3[j];
}
}
output[decodedLength] = '\0';
return decodedLength;
}
int Base64Class::encodedLength(int plainLength) {
int n = plainLength;
return (n + 2 - ((n + 2) % 3)) / 3 * 4;
}
int Base64Class::decodedLength(char * input, int inputLength) {
int i = 0;
int numEq = 0;
for(i = inputLength - 1; input[i] == '='; i--) {
numEq++;
}
return ((6 * inputLength) / 8) - numEq;
}
//Private utility functions
inline void Base64Class::fromA3ToA4(unsigned char * A4, unsigned char * A3) {
A4[0] = (A3[0] & 0xfc) >> 2;
A4[1] = ((A3[0] & 0x03) << 4) + ((A3[1] & 0xf0) >> 4);
A4[2] = ((A3[1] & 0x0f) << 2) + ((A3[2] & 0xc0) >> 6);
A4[3] = (A3[2] & 0x3f);
}
inline void Base64Class::fromA4ToA3(unsigned char * A3, unsigned char * A4) {
A3[0] = (A4[0] << 2) + ((A4[1] & 0x30) >> 4);
A3[1] = ((A4[1] & 0xf) << 4) + ((A4[2] & 0x3c) >> 2);
A3[2] = ((A4[2] & 0x3) << 6) + A4[3];
}
inline unsigned char Base64Class::lookupTable(char c) {
if(c >='A' && c <='Z') return c - 'A';
if(c >='a' && c <='z') return c - 71;
if(c >='0' && c <='9') return c + 4;
if(c == '+') return 62;
if(c == '/') return 63;
return -1;
}
Base64Class Base64;