diff --git a/applications/examples/u8g2_qrcode.c b/applications/examples/u8g2_qrcode.c new file mode 100644 index 00000000..1a067c43 --- /dev/null +++ b/applications/examples/u8g2_qrcode.c @@ -0,0 +1,71 @@ +#include "u8g2/u8g2.h" +#include "qrcode/qrcode.h" +#include "flipper.h" + +void u8g2_DrawPixelSize(u8g2_t* u8g2, uint8_t x, uint8_t y, uint8_t size) { + for(uint8_t px = 0; px < size; px++) { + for(uint8_t py = 0; py < size; py++) { + u8g2_DrawPixel(u8g2, x + px, y + py); + } + } +} + +void u8g2_qrcode(void* p) { + FuriRecordSubscriber* log = get_default_log(); + + // open record + FuriRecordSubscriber* fb_record = furi_open("u8g2_fb", false, false, NULL, NULL, NULL); + + // Allocate a chunk of memory to store the QR code + // https://github.com/ricmoo/QRCode + // we init version 1, 21x21 px, 16 alphanumeric chars with + // QUARTILE error correction + const uint8_t qr_version = 1; + const uint8_t qr_error_correction = ECC_QUARTILE; + + const uint8_t qr_x = 32; + const uint8_t qr_y = 0; + const uint8_t qr_size = 3; + + // The structure to manage the QR code + QRCode qrcode; + + // QR Code init + uint8_t qrcodeBytes[qrcode_getBufferSize(qr_version)]; + qrcode_initText(&qrcode, qrcodeBytes, qr_version, qr_error_correction, "HELLO FLIPPER"); + + if(fb_record == NULL) { + fuprintf(log, "[widget] cannot create fb record\n"); + furiac_exit(NULL); + } + + u8g2_t* fb = furi_take(fb_record); + + // clear display + if(fb != NULL) { + u8g2_ClearBuffer(fb); + } + + while(1) { + if(fb != NULL) { + // draw qr code + for(uint8_t y = 0; y < qrcode.size; y++) { + for(uint8_t x = 0; x < qrcode.size; x++) { + if(qrcode_getModule(&qrcode, x, y)) { + u8g2_SetDrawColor(fb, 1); + u8g2_DrawPixelSize(fb, qr_x + x * qr_size, qr_y + y * qr_size, qr_size); + } else { + u8g2_SetDrawColor(fb, 0); + u8g2_DrawPixelSize(fb, qr_x + x * qr_size, qr_y + y * qr_size, qr_size); + } + } + } + } else { + furiac_exit(NULL); + } + + furi_commit(fb_record); + + delay(1); + } +} \ No newline at end of file diff --git a/applications/startup.h b/applications/startup.h index 132873c9..e43af241 100644 --- a/applications/startup.h +++ b/applications/startup.h @@ -26,6 +26,8 @@ void input_task(void* p); void coreglitch_demo_0(void* p); +void u8g2_qrcode(void* p); + const FlipperStartupApp FLIPPER_STARTUP[] = { #ifndef TEST {.app = display_u8g2, .name = "display_u8g2", .libs = ""}, @@ -55,4 +57,8 @@ const FlipperStartupApp FLIPPER_STARTUP[] = { #ifdef EXAMPLE_INPUT_DUMP {.app = application_input_dump, .name = "input dump", .libs = "input_task"}, #endif + +#ifdef EXAMPLE_QRCODE + {.app = u8g2_qrcode, .name = "u8g2_qrcode", .libs = "display_u8g2"}, +#endif }; diff --git a/lib/qrcode/qrcode.c b/lib/qrcode/qrcode.c new file mode 100644 index 00000000..7aa111a0 --- /dev/null +++ b/lib/qrcode/qrcode.c @@ -0,0 +1,971 @@ +/** + * The MIT License (MIT) + * + * This library is written and maintained by Richard Moore. + * Major parts were derived from Project Nayuki's library. + * + * Copyright (c) 2017 Richard Moore (https://github.com/ricmoo/QRCode) + * Copyright (c) 2017 Project Nayuki (https://www.nayuki.io/page/qr-code-generator-library) + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +/** + * Special thanks to Nayuki (https://www.nayuki.io/) from which this library was + * heavily inspired and compared against. + * + * See: https://github.com/nayuki/QR-Code-generator/tree/master/cpp + */ + +#include "qrcode.h" + +#include +#include + +#pragma mark - Error Correction Lookup tables + +#if LOCK_VERSION == 0 + +static const uint16_t NUM_ERROR_CORRECTION_CODEWORDS[4][40] = { + // 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, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40 Error correction level + {10, 16, 26, 36, 48, 64, 72, 88, 110, 130, 150, 176, 198, 216, + 240, 280, 308, 338, 364, 416, 442, 476, 504, 560, 588, 644, 700, 728, + 784, 812, 868, 924, 980, 1036, 1064, 1120, 1204, 1260, 1316, 1372}, // Medium + {7, 10, 15, 20, 26, 36, 40, 48, 60, 72, 80, 96, 104, 120, + 132, 144, 168, 180, 196, 224, 224, 252, 270, 300, 312, 336, 360, 390, + 420, 450, 480, 510, 540, 570, 570, 600, 630, 660, 720, 750}, // Low + {17, 28, 44, 64, 88, 112, 130, 156, 192, 224, 264, 308, 352, 384, + 432, 480, 532, 588, 650, 700, 750, 816, 900, 960, 1050, 1110, 1200, 1260, + 1350, 1440, 1530, 1620, 1710, 1800, 1890, 1980, 2100, 2220, 2310, 2430}, // High + {13, 22, 36, 52, 72, 96, 108, 132, 160, 192, 224, 260, 288, 320, + 360, 408, 448, 504, 546, 600, 644, 690, 750, 810, 870, 952, 1020, 1050, + 1140, 1200, 1290, 1350, 1440, 1530, 1590, 1680, 1770, 1860, 1950, 2040}, // Quartile +}; + +static const uint8_t NUM_ERROR_CORRECTION_BLOCKS[4][40] = { + // Version: (note that index 0 is for padding, and is set to an illegal value) + // 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, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40 Error correction level + {1, 1, 1, 2, 2, 4, 4, 4, 5, 5, 5, 8, 9, 9, 10, 10, 11, 13, 14, 16, + 17, 17, 18, 20, 21, 23, 25, 26, 28, 29, 31, 33, 35, 37, 38, 40, 43, 45, 47, 49}, // Medium + {1, 1, 1, 1, 1, 2, 2, 2, 2, 4, 4, 4, 4, 4, 6, 6, 6, 6, 7, 8, + 8, 9, 9, 10, 12, 12, 12, 13, 14, 15, 16, 17, 18, 19, 19, 20, 21, 22, 24, 25}, // Low + {1, 1, 2, 4, 4, 4, 5, 6, 8, 8, 11, 11, 16, 16, 18, 16, 19, 21, 25, 25, + 25, 34, 30, 32, 35, 37, 40, 42, 45, 48, 51, 54, 57, 60, 63, 66, 70, 74, 77, 81}, // High + {1, 1, 2, 2, 4, 4, 6, 6, 8, 8, 8, 10, 12, 16, 12, 17, 16, 18, 21, 20, + 23, 23, 25, 27, 29, 34, 34, 35, 38, 40, 43, 45, 48, 51, 53, 56, 59, 62, 65, 68}, // Quartile +}; + +static const uint16_t NUM_RAW_DATA_MODULES[40] = { + // 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, + 208, + 359, + 567, + 807, + 1079, + 1383, + 1568, + 1936, + 2336, + 2768, + 3232, + 3728, + 4256, + 4651, + 5243, + 5867, + 6523, + // 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, + 7211, + 7931, + 8683, + 9252, + 10068, + 10916, + 11796, + 12708, + 13652, + 14628, + 15371, + 16411, + 17483, + 18587, + // 32, 33, 34, 35, 36, 37, 38, 39, 40 + 19723, + 20891, + 22091, + 23008, + 24272, + 25568, + 26896, + 28256, + 29648}; + +// @TODO: Put other LOCK_VERSIONS here +#elif LOCK_VERSION == 3 + +static const int16_t NUM_ERROR_CORRECTION_CODEWORDS[4] = {26, 15, 44, 36}; + +static const int8_t NUM_ERROR_CORRECTION_BLOCKS[4] = {1, 1, 2, 2}; + +static const uint16_t NUM_RAW_DATA_MODULES = 567; + +#else + +#error Unsupported LOCK_VERSION (add it...) + +#endif + +static int max(int a, int b) { + if(a > b) { + return a; + } + return b; +} + +/* +static int abs(int value) { + if (value < 0) { return -value; } + return value; +} +*/ + +#pragma mark - Mode testing and conversion + +static int8_t getAlphanumeric(char c) { + if(c >= '0' && c <= '9') { + return (c - '0'); + } + if(c >= 'A' && c <= 'Z') { + return (c - 'A' + 10); + } + + switch(c) { + case ' ': + return 36; + case '$': + return 37; + case '%': + return 38; + case '*': + return 39; + case '+': + return 40; + case '-': + return 41; + case '.': + return 42; + case '/': + return 43; + case ':': + return 44; + } + + return -1; +} + +static bool isAlphanumeric(const char* text, uint16_t length) { + while(length != 0) { + if(getAlphanumeric(text[--length]) == -1) { + return false; + } + } + return true; +} + +static bool isNumeric(const char* text, uint16_t length) { + while(length != 0) { + char c = text[--length]; + if(c < '0' || c > '9') { + return false; + } + } + return true; +} + +#pragma mark - Counting + +// We store the following tightly packed (less 8) in modeInfo +// <=9 <=26 <= 40 +// NUMERIC ( 10, 12, 14); +// ALPHANUMERIC ( 9, 11, 13); +// BYTE ( 8, 16, 16); +static char getModeBits(uint8_t version, uint8_t mode) { + // Note: We use 15 instead of 16; since 15 doesn't exist and we cannot store 16 (8 + 8) in 3 bits + // hex(int("".join(reversed([('00' + bin(x - 8)[2:])[-3:] for x in [10, 9, 8, 12, 11, 15, 14, 13, 15]])), 2)) + unsigned int modeInfo = 0x7bbb80a; + +#if LOCK_VERSION == 0 || LOCK_VERSION > 9 + if(version > 9) { + modeInfo >>= 9; + } +#endif + +#if LOCK_VERSION == 0 || LOCK_VERSION > 26 + if(version > 26) { + modeInfo >>= 9; + } +#endif + + char result = 8 + ((modeInfo >> (3 * mode)) & 0x07); + if(result == 15) { + result = 16; + } + + return result; +} + +#pragma mark - BitBucket + +typedef struct BitBucket { + uint32_t bitOffsetOrWidth; + uint16_t capacityBytes; + uint8_t* data; +} BitBucket; + +/* +void bb_dump(BitBucket *bitBuffer) { + printf("Buffer: "); + for (uint32_t i = 0; i < bitBuffer->capacityBytes; i++) { + printf("%02x", bitBuffer->data[i]); + if ((i % 4) == 3) { printf(" "); } + } + printf("\n"); +} +*/ + +static uint16_t bb_getGridSizeBytes(uint8_t size) { + return (((size * size) + 7) / 8); +} + +static uint16_t bb_getBufferSizeBytes(uint32_t bits) { + return ((bits + 7) / 8); +} + +static void bb_initBuffer(BitBucket* bitBuffer, uint8_t* data, int32_t capacityBytes) { + bitBuffer->bitOffsetOrWidth = 0; + bitBuffer->capacityBytes = capacityBytes; + bitBuffer->data = data; + + memset(data, 0, bitBuffer->capacityBytes); +} + +static void bb_initGrid(BitBucket* bitGrid, uint8_t* data, uint8_t size) { + bitGrid->bitOffsetOrWidth = size; + bitGrid->capacityBytes = bb_getGridSizeBytes(size); + bitGrid->data = data; + + memset(data, 0, bitGrid->capacityBytes); +} + +static void bb_appendBits(BitBucket* bitBuffer, uint32_t val, uint8_t length) { + uint32_t offset = bitBuffer->bitOffsetOrWidth; + for(int8_t i = length - 1; i >= 0; i--, offset++) { + bitBuffer->data[offset >> 3] |= ((val >> i) & 1) << (7 - (offset & 7)); + } + bitBuffer->bitOffsetOrWidth = offset; +} +/* +void bb_setBits(BitBucket *bitBuffer, uint32_t val, int offset, uint8_t length) { + for (int8_t i = length - 1; i >= 0; i--, offset++) { + bitBuffer->data[offset >> 3] |= ((val >> i) & 1) << (7 - (offset & 7)); + } +} +*/ +static void bb_setBit(BitBucket* bitGrid, uint8_t x, uint8_t y, bool on) { + uint32_t offset = y * bitGrid->bitOffsetOrWidth + x; + uint8_t mask = 1 << (7 - (offset & 0x07)); + if(on) { + bitGrid->data[offset >> 3] |= mask; + } else { + bitGrid->data[offset >> 3] &= ~mask; + } +} + +static void bb_invertBit(BitBucket* bitGrid, uint8_t x, uint8_t y, bool invert) { + uint32_t offset = y * bitGrid->bitOffsetOrWidth + x; + uint8_t mask = 1 << (7 - (offset & 0x07)); + bool on = ((bitGrid->data[offset >> 3] & (1 << (7 - (offset & 0x07)))) != 0); + if(on ^ invert) { + bitGrid->data[offset >> 3] |= mask; + } else { + bitGrid->data[offset >> 3] &= ~mask; + } +} + +static bool bb_getBit(BitBucket* bitGrid, uint8_t x, uint8_t y) { + uint32_t offset = y * bitGrid->bitOffsetOrWidth + x; + return (bitGrid->data[offset >> 3] & (1 << (7 - (offset & 0x07)))) != 0; +} + +#pragma mark - Drawing Patterns + +// XORs the data modules in this QR Code with the given mask pattern. Due to XOR's mathematical +// properties, calling applyMask(m) twice with the same value is equivalent to no change at all. +// This means it is possible to apply a mask, undo it, and try another mask. Note that a final +// well-formed QR Code symbol needs exactly one mask applied (not zero, not two, etc.). +static void applyMask(BitBucket* modules, BitBucket* isFunction, uint8_t mask) { + uint8_t size = modules->bitOffsetOrWidth; + + for(uint8_t y = 0; y < size; y++) { + for(uint8_t x = 0; x < size; x++) { + if(bb_getBit(isFunction, x, y)) { + continue; + } + + bool invert = 0; + switch(mask) { + case 0: + invert = (x + y) % 2 == 0; + break; + case 1: + invert = y % 2 == 0; + break; + case 2: + invert = x % 3 == 0; + break; + case 3: + invert = (x + y) % 3 == 0; + break; + case 4: + invert = (x / 3 + y / 2) % 2 == 0; + break; + case 5: + invert = x * y % 2 + x * y % 3 == 0; + break; + case 6: + invert = (x * y % 2 + x * y % 3) % 2 == 0; + break; + case 7: + invert = ((x + y) % 2 + x * y % 3) % 2 == 0; + break; + } + bb_invertBit(modules, x, y, invert); + } + } +} + +static void +setFunctionModule(BitBucket* modules, BitBucket* isFunction, uint8_t x, uint8_t y, bool on) { + bb_setBit(modules, x, y, on); + bb_setBit(isFunction, x, y, true); +} + +// Draws a 9*9 finder pattern including the border separator, with the center module at (x, y). +static void drawFinderPattern(BitBucket* modules, BitBucket* isFunction, uint8_t x, uint8_t y) { + uint8_t size = modules->bitOffsetOrWidth; + + for(int8_t i = -4; i <= 4; i++) { + for(int8_t j = -4; j <= 4; j++) { + uint8_t dist = max(abs(i), abs(j)); // Chebyshev/infinity norm + int16_t xx = x + j, yy = y + i; + if(0 <= xx && xx < size && 0 <= yy && yy < size) { + setFunctionModule(modules, isFunction, xx, yy, dist != 2 && dist != 4); + } + } + } +} + +// Draws a 5*5 alignment pattern, with the center module at (x, y). +static void drawAlignmentPattern(BitBucket* modules, BitBucket* isFunction, uint8_t x, uint8_t y) { + for(int8_t i = -2; i <= 2; i++) { + for(int8_t j = -2; j <= 2; j++) { + setFunctionModule(modules, isFunction, x + j, y + i, max(abs(i), abs(j)) != 1); + } + } +} + +// Draws two copies of the format bits (with its own error correction code) +// based on the given mask and this object's error correction level field. +static void drawFormatBits(BitBucket* modules, BitBucket* isFunction, uint8_t ecc, uint8_t mask) { + uint8_t size = modules->bitOffsetOrWidth; + + // Calculate error correction code and pack bits + uint32_t data = ecc << 3 | mask; // errCorrLvl is uint2, mask is uint3 + uint32_t rem = data; + for(int i = 0; i < 10; i++) { + rem = (rem << 1) ^ ((rem >> 9) * 0x537); + } + + data = data << 10 | rem; + data ^= 0x5412; // uint15 + + // Draw first copy + for(uint8_t i = 0; i <= 5; i++) { + setFunctionModule(modules, isFunction, 8, i, ((data >> i) & 1) != 0); + } + + setFunctionModule(modules, isFunction, 8, 7, ((data >> 6) & 1) != 0); + setFunctionModule(modules, isFunction, 8, 8, ((data >> 7) & 1) != 0); + setFunctionModule(modules, isFunction, 7, 8, ((data >> 8) & 1) != 0); + + for(int8_t i = 9; i < 15; i++) { + setFunctionModule(modules, isFunction, 14 - i, 8, ((data >> i) & 1) != 0); + } + + // Draw second copy + for(int8_t i = 0; i <= 7; i++) { + setFunctionModule(modules, isFunction, size - 1 - i, 8, ((data >> i) & 1) != 0); + } + + for(int8_t i = 8; i < 15; i++) { + setFunctionModule(modules, isFunction, 8, size - 15 + i, ((data >> i) & 1) != 0); + } + + setFunctionModule(modules, isFunction, 8, size - 8, true); +} + +// Draws two copies of the version bits (with its own error correction code), +// based on this object's version field (which only has an effect for 7 <= version <= 40). +static void drawVersion(BitBucket* modules, BitBucket* isFunction, uint8_t version) { + int8_t size = modules->bitOffsetOrWidth; + +#if LOCK_VERSION != 0 && LOCK_VERSION < 7 + return; + +#else + if(version < 7) { + return; + } + + // Calculate error correction code and pack bits + uint32_t rem = version; // version is uint6, in the range [7, 40] + for(uint8_t i = 0; i < 12; i++) { + rem = (rem << 1) ^ ((rem >> 11) * 0x1F25); + } + + uint32_t data = version << 12 | rem; // uint18 + + // Draw two copies + for(uint8_t i = 0; i < 18; i++) { + bool bit = ((data >> i) & 1) != 0; + uint8_t a = size - 11 + i % 3, b = i / 3; + setFunctionModule(modules, isFunction, a, b, bit); + setFunctionModule(modules, isFunction, b, a, bit); + } + +#endif +} + +static void +drawFunctionPatterns(BitBucket* modules, BitBucket* isFunction, uint8_t version, uint8_t ecc) { + uint8_t size = modules->bitOffsetOrWidth; + + // Draw the horizontal and vertical timing patterns + for(uint8_t i = 0; i < size; i++) { + setFunctionModule(modules, isFunction, 6, i, i % 2 == 0); + setFunctionModule(modules, isFunction, i, 6, i % 2 == 0); + } + + // Draw 3 finder patterns (all corners except bottom right; overwrites some timing modules) + drawFinderPattern(modules, isFunction, 3, 3); + drawFinderPattern(modules, isFunction, size - 4, 3); + drawFinderPattern(modules, isFunction, 3, size - 4); + +#if LOCK_VERSION == 0 || LOCK_VERSION > 1 + + if(version > 1) { + // Draw the numerous alignment patterns + + uint8_t alignCount = version / 7 + 2; + uint8_t step; + if(version != 32) { + step = (version * 4 + alignCount * 2 + 1) / (2 * alignCount - 2) * + 2; // ceil((size - 13) / (2*numAlign - 2)) * 2 + } else { // C-C-C-Combo breaker! + step = 26; + } + + uint8_t alignPositionIndex = alignCount - 1; + uint8_t alignPosition[alignCount]; + + alignPosition[0] = 6; + + uint8_t size = version * 4 + 17; + for(uint8_t i = 0, pos = size - 7; i < alignCount - 1; i++, pos -= step) { + alignPosition[alignPositionIndex--] = pos; + } + + for(uint8_t i = 0; i < alignCount; i++) { + for(uint8_t j = 0; j < alignCount; j++) { + if((i == 0 && j == 0) || (i == 0 && j == alignCount - 1) || + (i == alignCount - 1 && j == 0)) { + continue; // Skip the three finder corners + } else { + drawAlignmentPattern(modules, isFunction, alignPosition[i], alignPosition[j]); + } + } + } + } + +#endif + + // Draw configuration data + drawFormatBits( + modules, isFunction, ecc, 0); // Dummy mask value; overwritten later in the constructor + drawVersion(modules, isFunction, version); +} + +// Draws the given sequence of 8-bit codewords (data and error correction) onto the entire +// data area of this QR Code symbol. Function modules need to be marked off before this is called. +static void drawCodewords(BitBucket* modules, BitBucket* isFunction, BitBucket* codewords) { + uint32_t bitLength = codewords->bitOffsetOrWidth; + uint8_t* data = codewords->data; + + uint8_t size = modules->bitOffsetOrWidth; + + // Bit index into the data + uint32_t i = 0; + + // Do the funny zigzag scan + for(int16_t right = size - 1; right >= 1; + right -= 2) { // Index of right column in each column pair + if(right == 6) { + right = 5; + } + + for(uint8_t vert = 0; vert < size; vert++) { // Vertical counter + for(int j = 0; j < 2; j++) { + uint8_t x = right - j; // Actual x coordinate + bool upwards = ((right & 2) == 0) ^ (x < 6); + uint8_t y = upwards ? size - 1 - vert : vert; // Actual y coordinate + if(!bb_getBit(isFunction, x, y) && i < bitLength) { + bb_setBit(modules, x, y, ((data[i >> 3] >> (7 - (i & 7))) & 1) != 0); + i++; + } + // If there are any remainder bits (0 to 7), they are already + // set to 0/false/white when the grid of modules was initialized + } + } + } +} + +#pragma mark - Penalty Calculation + +#define PENALTY_N1 3 +#define PENALTY_N2 3 +#define PENALTY_N3 40 +#define PENALTY_N4 10 + +// Calculates and returns the penalty score based on state of this QR Code's current modules. +// This is used by the automatic mask choice algorithm to find the mask pattern that yields the lowest score. +// @TODO: This can be optimized by working with the bytes instead of bits. +static uint32_t getPenaltyScore(BitBucket* modules) { + uint32_t result = 0; + + uint8_t size = modules->bitOffsetOrWidth; + + // Adjacent modules in row having same color + for(uint8_t y = 0; y < size; y++) { + bool colorX = bb_getBit(modules, 0, y); + for(uint8_t x = 1, runX = 1; x < size; x++) { + bool cx = bb_getBit(modules, x, y); + if(cx != colorX) { + colorX = cx; + runX = 1; + + } else { + runX++; + if(runX == 5) { + result += PENALTY_N1; + } else if(runX > 5) { + result++; + } + } + } + } + + // Adjacent modules in column having same color + for(uint8_t x = 0; x < size; x++) { + bool colorY = bb_getBit(modules, x, 0); + for(uint8_t y = 1, runY = 1; y < size; y++) { + bool cy = bb_getBit(modules, x, y); + if(cy != colorY) { + colorY = cy; + runY = 1; + } else { + runY++; + if(runY == 5) { + result += PENALTY_N1; + } else if(runY > 5) { + result++; + } + } + } + } + + uint16_t black = 0; + for(uint8_t y = 0; y < size; y++) { + uint16_t bitsRow = 0, bitsCol = 0; + for(uint8_t x = 0; x < size; x++) { + bool color = bb_getBit(modules, x, y); + + // 2*2 blocks of modules having same color + if(x > 0 && y > 0) { + bool colorUL = bb_getBit(modules, x - 1, y - 1); + bool colorUR = bb_getBit(modules, x, y - 1); + bool colorL = bb_getBit(modules, x - 1, y); + if(color == colorUL && color == colorUR && color == colorL) { + result += PENALTY_N2; + } + } + + // Finder-like pattern in rows and columns + bitsRow = ((bitsRow << 1) & 0x7FF) | color; + bitsCol = ((bitsCol << 1) & 0x7FF) | bb_getBit(modules, y, x); + + // Needs 11 bits accumulated + if(x >= 10) { + if(bitsRow == 0x05D || bitsRow == 0x5D0) { + result += PENALTY_N3; + } + if(bitsCol == 0x05D || bitsCol == 0x5D0) { + result += PENALTY_N3; + } + } + + // Balance of black and white modules + if(color) { + black++; + } + } + } + + // Find smallest k such that (45-5k)% <= dark/total <= (55+5k)% + uint16_t total = size * size; + for(uint16_t k = 0; black * 20 < (9 - k) * total || black * 20 > (11 + k) * total; k++) { + result += PENALTY_N4; + } + + return result; +} + +#pragma mark - Reed-Solomon Generator + +static uint8_t rs_multiply(uint8_t x, uint8_t y) { + // Russian peasant multiplication + // See: https://en.wikipedia.org/wiki/Ancient_Egyptian_multiplication + uint16_t z = 0; + for(int8_t i = 7; i >= 0; i--) { + z = (z << 1) ^ ((z >> 7) * 0x11D); + z ^= ((y >> i) & 1) * x; + } + return z; +} + +static void rs_init(uint8_t degree, uint8_t* coeff) { + memset(coeff, 0, degree); + coeff[degree - 1] = 1; + + // Compute the product polynomial (x - r^0) * (x - r^1) * (x - r^2) * ... * (x - r^{degree-1}), + // drop the highest term, and store the rest of the coefficients in order of descending powers. + // Note that r = 0x02, which is a generator element of this field GF(2^8/0x11D). + uint16_t root = 1; + for(uint8_t i = 0; i < degree; i++) { + // Multiply the current product by (x - r^i) + for(uint8_t j = 0; j < degree; j++) { + coeff[j] = rs_multiply(coeff[j], root); + if(j + 1 < degree) { + coeff[j] ^= coeff[j + 1]; + } + } + root = (root << 1) ^ ((root >> 7) * 0x11D); // Multiply by 0x02 mod GF(2^8/0x11D) + } +} + +static void rs_getRemainder( + uint8_t degree, + uint8_t* coeff, + uint8_t* data, + uint8_t length, + uint8_t* result, + uint8_t stride) { + // Compute the remainder by performing polynomial division + + //for (uint8_t i = 0; i < degree; i++) { result[] = 0; } + //memset(result, 0, degree); + + for(uint8_t i = 0; i < length; i++) { + uint8_t factor = data[i] ^ result[0]; + for(uint8_t j = 1; j < degree; j++) { + result[(j - 1) * stride] = result[j * stride]; + } + result[(degree - 1) * stride] = 0; + + for(uint8_t j = 0; j < degree; j++) { + result[j * stride] ^= rs_multiply(coeff[j], factor); + } + } +} + +#pragma mark - QrCode + +static int8_t encodeDataCodewords( + BitBucket* dataCodewords, + const uint8_t* text, + uint16_t length, + uint8_t version) { + int8_t mode = MODE_BYTE; + + if(isNumeric((char*)text, length)) { + mode = MODE_NUMERIC; + bb_appendBits(dataCodewords, 1 << MODE_NUMERIC, 4); + bb_appendBits(dataCodewords, length, getModeBits(version, MODE_NUMERIC)); + + uint16_t accumData = 0; + uint8_t accumCount = 0; + for(uint16_t i = 0; i < length; i++) { + accumData = accumData * 10 + ((char)(text[i]) - '0'); + accumCount++; + if(accumCount == 3) { + bb_appendBits(dataCodewords, accumData, 10); + accumData = 0; + accumCount = 0; + } + } + + // 1 or 2 digits remaining + if(accumCount > 0) { + bb_appendBits(dataCodewords, accumData, accumCount * 3 + 1); + } + + } else if(isAlphanumeric((char*)text, length)) { + mode = MODE_ALPHANUMERIC; + bb_appendBits(dataCodewords, 1 << MODE_ALPHANUMERIC, 4); + bb_appendBits(dataCodewords, length, getModeBits(version, MODE_ALPHANUMERIC)); + + uint16_t accumData = 0; + uint8_t accumCount = 0; + for(uint16_t i = 0; i < length; i++) { + accumData = accumData * 45 + getAlphanumeric((char)(text[i])); + accumCount++; + if(accumCount == 2) { + bb_appendBits(dataCodewords, accumData, 11); + accumData = 0; + accumCount = 0; + } + } + + // 1 character remaining + if(accumCount > 0) { + bb_appendBits(dataCodewords, accumData, 6); + } + + } else { + bb_appendBits(dataCodewords, 1 << MODE_BYTE, 4); + bb_appendBits(dataCodewords, length, getModeBits(version, MODE_BYTE)); + for(uint16_t i = 0; i < length; i++) { + bb_appendBits(dataCodewords, (char)(text[i]), 8); + } + } + + //bb_setBits(dataCodewords, length, 4, getModeBits(version, mode)); + + return mode; +} + +static void performErrorCorrection(uint8_t version, uint8_t ecc, BitBucket* data) { + // See: http://www.thonky.com/qr-code-tutorial/structure-final-message + +#if LOCK_VERSION == 0 + uint8_t numBlocks = NUM_ERROR_CORRECTION_BLOCKS[ecc][version - 1]; + uint16_t totalEcc = NUM_ERROR_CORRECTION_CODEWORDS[ecc][version - 1]; + uint16_t moduleCount = NUM_RAW_DATA_MODULES[version - 1]; +#else + uint8_t numBlocks = NUM_ERROR_CORRECTION_BLOCKS[ecc]; + uint16_t totalEcc = NUM_ERROR_CORRECTION_CODEWORDS[ecc]; + uint16_t moduleCount = NUM_RAW_DATA_MODULES; +#endif + + uint8_t blockEccLen = totalEcc / numBlocks; + uint8_t numShortBlocks = numBlocks - moduleCount / 8 % numBlocks; + uint8_t shortBlockLen = moduleCount / 8 / numBlocks; + + uint8_t shortDataBlockLen = shortBlockLen - blockEccLen; + + uint8_t result[data->capacityBytes]; + memset(result, 0, sizeof(result)); + + uint8_t coeff[blockEccLen]; + rs_init(blockEccLen, coeff); + + uint16_t offset = 0; + uint8_t* dataBytes = data->data; + + // Interleave all short blocks + for(uint8_t i = 0; i < shortDataBlockLen; i++) { + uint16_t index = i; + uint8_t stride = shortDataBlockLen; + for(uint8_t blockNum = 0; blockNum < numBlocks; blockNum++) { + result[offset++] = dataBytes[index]; + +#if LOCK_VERSION == 0 || LOCK_VERSION >= 5 + if(blockNum == numShortBlocks) { + stride++; + } +#endif + index += stride; + } + } + + // Version less than 5 only have short blocks +#if LOCK_VERSION == 0 || LOCK_VERSION >= 5 + { + // Interleave long blocks + uint16_t index = shortDataBlockLen * (numShortBlocks + 1); + uint8_t stride = shortDataBlockLen; + for(uint8_t blockNum = 0; blockNum < numBlocks - numShortBlocks; blockNum++) { + result[offset++] = dataBytes[index]; + + if(blockNum == 0) { + stride++; + } + index += stride; + } + } +#endif + + // Add all ecc blocks, interleaved + uint8_t blockSize = shortDataBlockLen; + for(uint8_t blockNum = 0; blockNum < numBlocks; blockNum++) { +#if LOCK_VERSION == 0 || LOCK_VERSION >= 5 + if(blockNum == numShortBlocks) { + blockSize++; + } +#endif + rs_getRemainder( + blockEccLen, coeff, dataBytes, blockSize, &result[offset + blockNum], numBlocks); + dataBytes += blockSize; + } + + memcpy(data->data, result, data->capacityBytes); + data->bitOffsetOrWidth = moduleCount; +} + +// We store the Format bits tightly packed into a single byte (each of the 4 modes is 2 bits) +// The format bits can be determined by ECC_FORMAT_BITS >> (2 * ecc) +static const uint8_t ECC_FORMAT_BITS = (0x02 << 6) | (0x03 << 4) | (0x00 << 2) | (0x01 << 0); + +#pragma mark - Public QRCode functions + +uint16_t qrcode_getBufferSize(uint8_t version) { + return bb_getGridSizeBytes(4 * version + 17); +} + +// @TODO: Return error if data is too big. +int8_t qrcode_initBytes( + QRCode* qrcode, + uint8_t* modules, + uint8_t version, + uint8_t ecc, + uint8_t* data, + uint16_t length) { + uint8_t size = version * 4 + 17; + qrcode->version = version; + qrcode->size = size; + qrcode->ecc = ecc; + qrcode->modules = modules; + + uint8_t eccFormatBits = (ECC_FORMAT_BITS >> (2 * ecc)) & 0x03; + +#if LOCK_VERSION == 0 + uint16_t moduleCount = NUM_RAW_DATA_MODULES[version - 1]; + uint16_t dataCapacity = + moduleCount / 8 - NUM_ERROR_CORRECTION_CODEWORDS[eccFormatBits][version - 1]; +#else + version = LOCK_VERSION; + uint16_t moduleCount = NUM_RAW_DATA_MODULES; + uint16_t dataCapacity = moduleCount / 8 - NUM_ERROR_CORRECTION_CODEWORDS[eccFormatBits]; +#endif + + struct BitBucket codewords; + uint8_t codewordBytes[bb_getBufferSizeBytes(moduleCount)]; + bb_initBuffer(&codewords, codewordBytes, (int32_t)sizeof(codewordBytes)); + + // Place the data code words into the buffer + int8_t mode = encodeDataCodewords(&codewords, data, length, version); + + if(mode < 0) { + return -1; + } + qrcode->mode = mode; + + // Add terminator and pad up to a byte if applicable + uint32_t padding = (dataCapacity * 8) - codewords.bitOffsetOrWidth; + if(padding > 4) { + padding = 4; + } + bb_appendBits(&codewords, 0, padding); + bb_appendBits(&codewords, 0, (8 - codewords.bitOffsetOrWidth % 8) % 8); + + // Pad with alternate bytes until data capacity is reached + for(uint8_t padByte = 0xEC; codewords.bitOffsetOrWidth < (dataCapacity * 8); + padByte ^= 0xEC ^ 0x11) { + bb_appendBits(&codewords, padByte, 8); + } + + BitBucket modulesGrid; + bb_initGrid(&modulesGrid, modules, size); + + BitBucket isFunctionGrid; + uint8_t isFunctionGridBytes[bb_getGridSizeBytes(size)]; + bb_initGrid(&isFunctionGrid, isFunctionGridBytes, size); + + // Draw function patterns, draw all codewords, do masking + drawFunctionPatterns(&modulesGrid, &isFunctionGrid, version, eccFormatBits); + performErrorCorrection(version, eccFormatBits, &codewords); + drawCodewords(&modulesGrid, &isFunctionGrid, &codewords); + + // Find the best (lowest penalty) mask + uint8_t mask = 0; + int32_t minPenalty = INT32_MAX; + for(uint8_t i = 0; i < 8; i++) { + drawFormatBits(&modulesGrid, &isFunctionGrid, eccFormatBits, i); + applyMask(&modulesGrid, &isFunctionGrid, i); + int penalty = getPenaltyScore(&modulesGrid); + if(penalty < minPenalty) { + mask = i; + minPenalty = penalty; + } + applyMask(&modulesGrid, &isFunctionGrid, i); // Undoes the mask due to XOR + } + + qrcode->mask = mask; + + // Overwrite old format bits + drawFormatBits(&modulesGrid, &isFunctionGrid, eccFormatBits, mask); + + // Apply the final choice of mask + applyMask(&modulesGrid, &isFunctionGrid, mask); + + return 0; +} + +int8_t +qrcode_initText(QRCode* qrcode, uint8_t* modules, uint8_t version, uint8_t ecc, const char* data) { + return qrcode_initBytes(qrcode, modules, version, ecc, (uint8_t*)data, strlen(data)); +} + +bool qrcode_getModule(QRCode* qrcode, uint8_t x, uint8_t y) { + if(x < 0 || x >= qrcode->size || y < 0 || y >= qrcode->size) { + return false; + } + + uint32_t offset = y * qrcode->size + x; + return (qrcode->modules[offset >> 3] & (1 << (7 - (offset & 0x07)))) != 0; +} \ No newline at end of file diff --git a/lib/qrcode/qrcode.h b/lib/qrcode/qrcode.h new file mode 100644 index 00000000..9687755c --- /dev/null +++ b/lib/qrcode/qrcode.h @@ -0,0 +1,95 @@ +/** + * The MIT License (MIT) + * + * This library is written and maintained by Richard Moore. + * Major parts were derived from Project Nayuki's library. + * + * Copyright (c) 2017 Richard Moore (https://github.com/ricmoo/QRCode) + * Copyright (c) 2017 Project Nayuki (https://www.nayuki.io/page/qr-code-generator-library) + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +/** + * Special thanks to Nayuki (https://www.nayuki.io/) from which this library was + * heavily inspired and compared against. + * + * See: https://github.com/nayuki/QR-Code-generator/tree/master/cpp + */ + +#ifndef __QRCODE_H_ +#define __QRCODE_H_ + +#ifndef __cplusplus +typedef unsigned char bool; +static const bool false = 0; +static const bool true = 1; +#endif + +#include + +// QR Code Format Encoding +#define MODE_NUMERIC 0 +#define MODE_ALPHANUMERIC 1 +#define MODE_BYTE 2 + +// Error Correction Code Levels +#define ECC_LOW 0 +#define ECC_MEDIUM 1 +#define ECC_QUARTILE 2 +#define ECC_HIGH 3 + +// If set to non-zero, this library can ONLY produce QR codes at that version +// This saves a lot of dynamic memory, as the codeword tables are skipped +#ifndef LOCK_VERSION +#define LOCK_VERSION 0 +#endif + +typedef struct QRCode { + uint8_t version; + uint8_t size; + uint8_t ecc; + uint8_t mode; + uint8_t mask; + uint8_t* modules; +} QRCode; + +#ifdef __cplusplus +extern "C" { +#endif /* __cplusplus */ + +uint16_t qrcode_getBufferSize(uint8_t version); + +int8_t +qrcode_initText(QRCode* qrcode, uint8_t* modules, uint8_t version, uint8_t ecc, const char* data); +int8_t qrcode_initBytes( + QRCode* qrcode, + uint8_t* modules, + uint8_t version, + uint8_t ecc, + uint8_t* data, + uint16_t length); + +bool qrcode_getModule(QRCode* qrcode, uint8_t x, uint8_t y); + +#ifdef __cplusplus +} +#endif /* __cplusplus */ + +#endif /* __QRCODE_H_ */ \ No newline at end of file diff --git a/target_f2/Makefile b/target_f2/Makefile index 56802412..0619a42e 100644 --- a/target_f2/Makefile +++ b/target_f2/Makefile @@ -177,6 +177,12 @@ C_SOURCES += ../applications/examples/input_dump.c C_DEFS += -DEXAMPLE_INPUT_DUMP endif +ifeq ($(EXAMPLE_QRCODE), 1) +C_SOURCES += ../applications/examples/u8g2_qrcode.c +C_SOURCES += ../lib/qrcode/qrcode.c +C_DEFS += -DEXAMPLE_QRCODE +endif + # User application C_SOURCES += ../applications/coreglitch_demo_0/coreglitch_demo_0.c @@ -314,6 +320,10 @@ example_input_dump: EXAMPLE_INPUT_DUMP=1 make rm $(BUILD_DIR)/app.o +example_qrcode: + EXAMPLE_QRCODE=1 make + rm $(BUILD_DIR)/app.o + test: TEST=1 make rm $(BUILD_DIR)/app.o