0,0 → 1,185 |
/* quirc -- QR-code recognition library |
* Copyright (C) 2010-2012 Daniel Beer <dlbeer@gmail.com> |
* |
* Permission to use, copy, modify, and/or distribute this software for any |
* purpose with or without fee is hereby granted, provided that the above |
* copyright notice and this permission notice appear in all copies. |
* |
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
*/ |
|
#ifndef QUIRC_H_ |
#define QUIRC_H_ |
|
#include <stdint.h> |
|
/*#ifndef UINT8_MAX |
#define UINT8_MAX (255) |
#endif |
#ifndef UINT16_MAX |
#define UINT16_MAX (65535) |
#endif*/ |
|
#ifdef __cplusplus |
extern "C" { |
#endif |
|
struct quirc; |
|
/* Obtain the library version string. */ |
const char *quirc_version(void); |
|
/* Construct a new QR-code recognizer. This function will return NULL |
* if sufficient memory could not be allocated. |
*/ |
struct quirc *quirc_new(void); |
|
/* Destroy a QR-code recognizer. */ |
void quirc_destroy(struct quirc *q); |
|
/* Resize the QR-code recognizer. The size of an image must be |
* specified before codes can be analyzed. |
* |
* This function returns 0 on success, or -1 if sufficient memory could |
* not be allocated. |
*/ |
int quirc_resize(struct quirc *q, int w, int h); |
|
/* These functions are used to process images for QR-code recognition. |
* quirc_begin() must first be called to obtain access to a buffer into |
* which the input image should be placed. Optionally, the current |
* width and height may be returned. |
* |
* After filling the buffer, quirc_end() should be called to process |
* the image for QR-code recognition. The locations and content of each |
* code may be obtained using accessor functions described below. |
*/ |
uint8_t *quirc_begin(struct quirc *q, int *w, int *h); |
void quirc_end(struct quirc *q); |
|
/* This structure describes a location in the input image buffer. */ |
struct quirc_point { |
int x; |
int y; |
}; |
|
/* This enum describes the various decoder errors which may occur. */ |
typedef enum { |
QUIRC_SUCCESS = 0, |
QUIRC_ERROR_INVALID_GRID_SIZE, |
QUIRC_ERROR_INVALID_VERSION, |
QUIRC_ERROR_FORMAT_ECC, |
QUIRC_ERROR_DATA_ECC, |
QUIRC_ERROR_UNKNOWN_DATA_TYPE, |
QUIRC_ERROR_DATA_OVERFLOW, |
QUIRC_ERROR_DATA_UNDERFLOW |
} quirc_decode_error_t; |
|
/* Return a string error message for an error code. */ |
const char *quirc_strerror(quirc_decode_error_t err); |
|
/* Limits on the maximum size of QR-codes and their content. */ |
#define QUIRC_MAX_VERSION 40 |
#define QUIRC_MAX_GRID_SIZE (QUIRC_MAX_VERSION * 4 + 17) |
#define QUIRC_MAX_BITMAP (((QUIRC_MAX_GRID_SIZE * QUIRC_MAX_GRID_SIZE) + 7) / 8) |
#define QUIRC_MAX_PAYLOAD 8896 |
|
/* QR-code ECC types. */ |
#define QUIRC_ECC_LEVEL_M 0 |
#define QUIRC_ECC_LEVEL_L 1 |
#define QUIRC_ECC_LEVEL_H 2 |
#define QUIRC_ECC_LEVEL_Q 3 |
|
/* QR-code data types. */ |
#define QUIRC_DATA_TYPE_NUMERIC 1 |
#define QUIRC_DATA_TYPE_ALPHA 2 |
#define QUIRC_DATA_TYPE_BYTE 4 |
#define QUIRC_DATA_TYPE_KANJI 8 |
|
/* Common character encodings */ |
#define QUIRC_ECI_ISO_8859_1 1 |
#define QUIRC_ECI_IBM437 2 |
#define QUIRC_ECI_ISO_8859_2 4 |
#define QUIRC_ECI_ISO_8859_3 5 |
#define QUIRC_ECI_ISO_8859_4 6 |
#define QUIRC_ECI_ISO_8859_5 7 |
#define QUIRC_ECI_ISO_8859_6 8 |
#define QUIRC_ECI_ISO_8859_7 9 |
#define QUIRC_ECI_ISO_8859_8 10 |
#define QUIRC_ECI_ISO_8859_9 11 |
#define QUIRC_ECI_WINDOWS_874 13 |
#define QUIRC_ECI_ISO_8859_13 15 |
#define QUIRC_ECI_ISO_8859_15 17 |
#define QUIRC_ECI_SHIFT_JIS 20 |
#define QUIRC_ECI_UTF_8 26 |
|
/* This structure is used to return information about detected QR codes |
* in the input image. |
*/ |
struct quirc_code { |
/* The four corners of the QR-code, from top left, clockwise */ |
struct quirc_point corners[4]; |
|
/* The number of cells across in the QR-code. The cell bitmap |
* is a bitmask giving the actual values of cells. If the cell |
* at (x, y) is black, then the following bit is set: |
* |
* cell_bitmap[i >> 3] & (1 << (i & 7)) |
* |
* where i = (y * size) + x. |
*/ |
int size; |
uint8_t cell_bitmap[QUIRC_MAX_BITMAP]; |
}; |
|
/* This structure holds the decoded QR-code data */ |
struct quirc_data { |
/* Various parameters of the QR-code. These can mostly be |
* ignored if you only care about the data. |
*/ |
int version; |
int ecc_level; |
int mask; |
|
/* This field is the highest-valued data type found in the QR |
* code. |
*/ |
int data_type; |
|
/* Data payload. For the Kanji datatype, payload is encoded as |
* Shift-JIS. For all other datatypes, payload is ASCII text. |
*/ |
uint8_t payload[QUIRC_MAX_PAYLOAD]; |
int payload_len; |
|
/* ECI assignment number */ |
uint32_t eci; |
}; |
|
/* Return the number of QR-codes identified in the last processed |
* image. |
*/ |
int quirc_count(const struct quirc *q); |
|
/* Extract the QR-code specified by the given index. */ |
void quirc_extract(const struct quirc *q, int index, |
struct quirc_code *code); |
|
/* Decode a QR-code, returning the payload data. */ |
quirc_decode_error_t quirc_decode(const struct quirc_code *code, |
struct quirc_data *data); |
|
/* Flip a QR-code according to optional mirror feature of ISO 18004:2015 */ |
void quirc_flip(struct quirc_code *code); |
|
#ifdef __cplusplus |
} |
#endif |
|
#endif |