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+/**
+ * qrencode - QR Code encoder
+ *
+ * Copyright (C) 2006-2012 Kentaro Fukuchi <kentaro@fukuchi.org>
+ *
+ * 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 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.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/** \mainpage
+ * Libqrencode is a library for encoding data in a QR Code symbol, a kind of 2D
+ * symbology.
+ *
+ * \section encoding Encoding
+ *
+ * There are two methods to encode data: <b>encoding a string/data</b> or
+ * <b>encoding a structured data</b>.
+ *
+ * \subsection encoding-string Encoding a string/data
+ * You can encode a string by calling QRcode_encodeString().
+ * The given string is parsed automatically and encoded. If you want to encode
+ * data that can be represented as a C string style (NUL terminated), you can
+ * simply use this way.
+ *
+ * If the input data contains Kanji (Shift-JIS) characters and you want to
+ * encode them as Kanji in QR Code, you should give QR_MODE_KANJI as a hint.
+ * Otherwise, all of non-alphanumeric characters are encoded as 8 bit data.
+ * If you want to encode a whole string in 8 bit mode, you can use
+ * QRcode_encodeString8bit() instead.
+ *
+ * Please note that a C string can not contain NUL characters. If your data
+ * contains NUL, you must use QRcode_encodeData().
+ *
+ * \subsection encoding-input Encoding a structured data
+ * You can construct a structured input data manually. If the structure of the
+ * input data is known, you can use this way.
+ * At first, create a ::QRinput object by QRinput_new(). Then add input data
+ * to the QRinput object by QRinput_append(). Finally call QRcode_encodeInput()
+ * to encode the QRinput data.
+ * You can reuse the QRinput data again to encode it in other symbols with
+ * different parameters.
+ *
+ * \section result Result
+ * The encoded symbol is resulted as a ::QRcode object. It will contain
+ * its version number, width of the symbol and an array represents the symbol.
+ * See ::QRcode for the details. You can free the object by QRcode_free().
+ *
+ * Please note that the version of the result may be larger than specified.
+ * In such cases, the input data would be too large to be encoded in a
+ * symbol of the specified version.
+ *
+ * \section structured Structured append
+ * Libqrencode can generate "Structured-appended" symbols that enables to split
+ * a large data set into mulitple QR codes. A QR code reader concatenates
+ * multiple QR code symbols into a string.
+ * Just like QRcode_encodeString(), you can use QRcode_encodeStringStructured()
+ * to generate structured-appended symbols. This functions returns an instance
+ * of ::QRcode_List. The returned list is a singly-linked list of QRcode: you
+ * can retrieve each QR code in this way:
+ *
+ * \code
+ * QRcode_List *qrcodes;
+ * QRcode_List *entry;
+ * QRcode *qrcode;
+ *
+ * qrcodes = QRcode_encodeStringStructured(...);
+ * entry = qrcodes;
+ * while(entry != NULL) {
+ * qrcode = entry->code;
+ * // do something
+ * entry = entry->next;
+ * }
+ * QRcode_List_free(entry);
+ * \endcode
+ *
+ * Instead of using auto-parsing functions, you can construct your own
+ * structured input. At first, instantiate an object of ::QRinput_Struct
+ * by calling QRinput_Struct_new(). This object can hold multiple ::QRinput,
+ * and one QR code is generated for a ::QRinput.
+ * QRinput_Struct_appendInput() appends a ::QRinput to a ::QRinput_Struct
+ * object. In order to generate structured-appended symbols, it is required to
+ * embed headers to each symbol. You can use
+ * QRinput_Struct_insertStructuredAppendHeaders() to insert appropriate
+ * headers to each symbol. You should call this function just once before
+ * encoding symbols.
+ */
+
+#ifndef __QRENCODE_H__
+#define __QRENCODE_H__
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+/**
+ * Encoding mode.
+ */
+typedef enum {
+ QR_MODE_NUL = -1, ///< Terminator (NUL character). Internal use only
+ QR_MODE_NUM = 0, ///< Numeric mode
+ QR_MODE_AN, ///< Alphabet-numeric mode
+ QR_MODE_8, ///< 8-bit data mode
+ QR_MODE_KANJI, ///< Kanji (shift-jis) mode
+ QR_MODE_STRUCTURE, ///< Internal use only
+ QR_MODE_ECI, ///< ECI mode
+ QR_MODE_FNC1FIRST, ///< FNC1, first position
+ QR_MODE_FNC1SECOND, ///< FNC1, second position
+} QRencodeMode;
+
+/**
+ * Level of error correction.
+ */
+typedef enum {
+ QR_ECLEVEL_L = 0, ///< lowest
+ QR_ECLEVEL_M,
+ QR_ECLEVEL_Q,
+ QR_ECLEVEL_H ///< highest
+} QRecLevel;
+
+/**
+ * Maximum version (size) of QR-code symbol.
+ */
+#define QRSPEC_VERSION_MAX 40
+
+/**
+ * Maximum version (size) of QR-code symbol.
+ */
+#define MQRSPEC_VERSION_MAX 4
+
+
+/******************************************************************************
+ * Input data (qrinput.c)
+ *****************************************************************************/
+
+/**
+ * Singly linked list to contain input strings. An instance of this class
+ * contains its version and error correction level too. It is required to
+ * set them by QRinput_setVersion() and QRinput_setErrorCorrectionLevel(),
+ * or use QRinput_new2() to instantiate an object.
+ */
+typedef struct _QRinput QRinput;
+
+/**
+ * Instantiate an input data object. The version is set to 0 (auto-select)
+ * and the error correction level is set to QR_ECLEVEL_L.
+ * @return an input object (initialized). On error, NULL is returned and errno
+ * is set to indicate the error.
+ * @throw ENOMEM unable to allocate memory.
+ */
+extern QRinput *QRinput_new(void);
+
+/**
+ * Instantiate an input data object.
+ * @param version version number.
+ * @param level Error correction level.
+ * @return an input object (initialized). On error, NULL is returned and errno
+ * is set to indicate the error.
+ * @throw ENOMEM unable to allocate memory for input objects.
+ * @throw EINVAL invalid arguments.
+ */
+extern QRinput *QRinput_new2(int version, QRecLevel level);
+
+/**
+ * Instantiate an input data object. Object's Micro QR Code flag is set.
+ * Unlike with full-sized QR Code, version number must be specified (>0).
+ * @param version version number (1--4).
+ * @param level Error correction level.
+ * @return an input object (initialized). On error, NULL is returned and errno
+ * is set to indicate the error.
+ * @throw ENOMEM unable to allocate memory for input objects.
+ * @throw EINVAL invalid arguments.
+ */
+extern QRinput *QRinput_newMQR(int version, QRecLevel level);
+
+/**
+ * Append data to an input object.
+ * The data is copied and appended to the input object.
+ * @param input input object.
+ * @param mode encoding mode.
+ * @param size size of data (byte).
+ * @param data a pointer to the memory area of the input data.
+ * @retval 0 success.
+ * @retval -1 an error occurred and errno is set to indeicate the error.
+ * See Execptions for the details.
+ * @throw ENOMEM unable to allocate memory.
+ * @throw EINVAL input data is invalid.
+ *
+ */
+extern int QRinput_append(QRinput *input, QRencodeMode mode, int size, const unsigned char *data);
+
+/**
+ * Append ECI header.
+ * @param input input object.
+ * @param ecinum ECI indicator number (0 - 999999)
+ * @retval 0 success.
+ * @retval -1 an error occurred and errno is set to indeicate the error.
+ * See Execptions for the details.
+ * @throw ENOMEM unable to allocate memory.
+ * @throw EINVAL input data is invalid.
+ *
+ */
+extern int QRinput_appendECIheader(QRinput *input, unsigned int ecinum);
+
+/**
+ * Get current version.
+ * @param input input object.
+ * @return current version.
+ */
+extern int QRinput_getVersion(QRinput *input);
+
+/**
+ * Set version of the QR code that is to be encoded.
+ * This function cannot be applied to Micro QR Code.
+ * @param input input object.
+ * @param version version number (0 = auto)
+ * @retval 0 success.
+ * @retval -1 invalid argument.
+ */
+extern int QRinput_setVersion(QRinput *input, int version);
+
+/**
+ * Get current error correction level.
+ * @param input input object.
+ * @return Current error correcntion level.
+ */
+extern QRecLevel QRinput_getErrorCorrectionLevel(QRinput *input);
+
+/**
+ * Set error correction level of the QR code that is to be encoded.
+ * This function cannot be applied to Micro QR Code.
+ * @param input input object.
+ * @param level Error correction level.
+ * @retval 0 success.
+ * @retval -1 invalid argument.
+ */
+extern int QRinput_setErrorCorrectionLevel(QRinput *input, QRecLevel level);
+
+/**
+ * Set version and error correction level of the QR code at once.
+ * This function is recommened for Micro QR Code.
+ * @param input input object.
+ * @param version version number (0 = auto)
+ * @param level Error correction level.
+ * @retval 0 success.
+ * @retval -1 invalid argument.
+ */
+extern int QRinput_setVersionAndErrorCorrectionLevel(QRinput *input, int version, QRecLevel level);
+
+/**
+ * Free the input object.
+ * All of data chunks in the input object are freed too.
+ * @param input input object.
+ */
+extern void QRinput_free(QRinput *input);
+
+/**
+ * Validate the input data.
+ * @param mode encoding mode.
+ * @param size size of data (byte).
+ * @param data a pointer to the memory area of the input data.
+ * @retval 0 success.
+ * @retval -1 invalid arguments.
+ */
+extern int QRinput_check(QRencodeMode mode, int size, const unsigned char *data);
+
+/**
+ * Set of QRinput for structured symbols.
+ */
+typedef struct _QRinput_Struct QRinput_Struct;
+
+/**
+ * Instantiate a set of input data object.
+ * @return an instance of QRinput_Struct. On error, NULL is returned and errno
+ * is set to indicate the error.
+ * @throw ENOMEM unable to allocate memory.
+ */
+extern QRinput_Struct *QRinput_Struct_new(void);
+
+/**
+ * Set parity of structured symbols.
+ * @param s structured input object.
+ * @param parity parity of s.
+ */
+extern void QRinput_Struct_setParity(QRinput_Struct *s, unsigned char parity);
+
+/**
+ * Append a QRinput object to the set. QRinput created by QRinput_newMQR()
+ * will be rejected.
+ * @warning never append the same QRinput object twice or more.
+ * @param s structured input object.
+ * @param input an input object.
+ * @retval >0 number of input objects in the structure.
+ * @retval -1 an error occurred. See Exceptions for the details.
+ * @throw ENOMEM unable to allocate memory.
+ * @throw EINVAL invalid arguments.
+ */
+extern int QRinput_Struct_appendInput(QRinput_Struct *s, QRinput *input);
+
+/**
+ * Free all of QRinput in the set.
+ * @param s a structured input object.
+ */
+extern void QRinput_Struct_free(QRinput_Struct *s);
+
+/**
+ * Split a QRinput to QRinput_Struct. It calculates a parity, set it, then
+ * insert structured-append headers. QRinput created by QRinput_newMQR() will
+ * be rejected.
+ * @param input input object. Version number and error correction level must be
+ * set.
+ * @return a set of input data. On error, NULL is returned, and errno is set
+ * to indicate the error. See Exceptions for the details.
+ * @throw ERANGE input data is too large.
+ * @throw EINVAL invalid input data.
+ * @throw ENOMEM unable to allocate memory.
+ */
+extern QRinput_Struct *QRinput_splitQRinputToStruct(QRinput *input);
+
+/**
+ * Insert structured-append headers to the input structure. It calculates
+ * a parity and set it if the parity is not set yet.
+ * @param s input structure
+ * @retval 0 success.
+ * @retval -1 an error occurred and errno is set to indeicate the error.
+ * See Execptions for the details.
+ * @throw EINVAL invalid input object.
+ * @throw ENOMEM unable to allocate memory.
+ */
+extern int QRinput_Struct_insertStructuredAppendHeaders(QRinput_Struct *s);
+
+/**
+ * Set FNC1-1st position flag.
+ */
+extern int QRinput_setFNC1First(QRinput *input);
+
+/**
+ * Set FNC1-2nd position flag and application identifier.
+ */
+extern int QRinput_setFNC1Second(QRinput *input, unsigned char appid);
+
+/******************************************************************************
+ * QRcode output (qrencode.c)
+ *****************************************************************************/
+
+/**
+ * QRcode class.
+ * Symbol data is represented as an array contains width*width uchars.
+ * Each uchar represents a module (dot). If the less significant bit of
+ * the uchar is 1, the corresponding module is black. The other bits are
+ * meaningless for usual applications, but here its specification is described.
+ *
+ * <pre>
+ * MSB 76543210 LSB
+ * |||||||`- 1=black/0=white
+ * ||||||`-- data and ecc code area
+ * |||||`--- format information
+ * ||||`---- version information
+ * |||`----- timing pattern
+ * ||`------ alignment pattern
+ * |`------- finder pattern and separator
+ * `-------- non-data modules (format, timing, etc.)
+ * </pre>
+ */
+typedef struct {
+ int version; ///< version of the symbol
+ int width; ///< width of the symbol
+ unsigned char *data; ///< symbol data
+} QRcode;
+
+/**
+ * Singly-linked list of QRcode. Used to represent a structured symbols.
+ * A list is terminated with NULL.
+ */
+typedef struct _QRcode_List {
+ QRcode *code;
+ struct _QRcode_List *next;
+} QRcode_List;
+
+/**
+ * Create a symbol from the input data.
+ * @warning This function is THREAD UNSAFE when pthread is disabled.
+ * @param input input data.
+ * @return an instance of QRcode class. The version of the result QRcode may
+ * be larger than the designated version. On error, NULL is returned,
+ * and errno is set to indicate the error. See Exceptions for the
+ * details.
+ * @throw EINVAL invalid input object.
+ * @throw ENOMEM unable to allocate memory for input objects.
+ */
+extern QRcode *QRcode_encodeInput(QRinput *input);
+
+/**
+ * Create a symbol from the string. The library automatically parses the input
+ * string and encodes in a QR Code symbol.
+ * @warning This function is THREAD UNSAFE when pthread is disabled.
+ * @param string input string. It must be NUL terminated.
+ * @param version version of the symbol. If 0, the library chooses the minimum
+ * version for the given input data.
+ * @param level error correction level.
+ * @param hint tell the library how Japanese Kanji characters should be
+ * encoded. If QR_MODE_KANJI is given, the library assumes that the
+ * given string contains Shift-JIS characters and encodes them in
+ * Kanji-mode. If QR_MODE_8 is given, all of non-alphanumerical
+ * characters will be encoded as is. If you want to embed UTF-8
+ * string, choose this. Other mode will cause EINVAL error.
+ * @param casesensitive case-sensitive(1) or not(0).
+ * @return an instance of QRcode class. The version of the result QRcode may
+ * be larger than the designated version. On error, NULL is returned,
+ * and errno is set to indicate the error. See Exceptions for the
+ * details.
+ * @throw EINVAL invalid input object.
+ * @throw ENOMEM unable to allocate memory for input objects.
+ * @throw ERANGE input data is too large.
+ */
+extern QRcode *QRcode_encodeString(const char *string, int version, QRecLevel level, QRencodeMode hint, int casesensitive);
+
+/**
+ * Same to QRcode_encodeString(), but encode whole data in 8-bit mode.
+ * @warning This function is THREAD UNSAFE when pthread is disabled.
+ */
+extern QRcode *QRcode_encodeString8bit(const char *string, int version, QRecLevel level);
+
+/**
+ * Micro QR Code version of QRcode_encodeString().
+ * @warning This function is THREAD UNSAFE when pthread is disabled.
+ */
+extern QRcode *QRcode_encodeStringMQR(const char *string, int version, QRecLevel level, QRencodeMode hint, int casesensitive);
+
+/**
+ * Micro QR Code version of QRcode_encodeString8bit().
+ * @warning This function is THREAD UNSAFE when pthread is disabled.
+ */
+extern QRcode *QRcode_encodeString8bitMQR(const char *string, int version, QRecLevel level);
+
+/**
+ * Encode byte stream (may include '\0') in 8-bit mode.
+ * @warning This function is THREAD UNSAFE when pthread is disabled.
+ * @param size size of the input data.
+ * @param data input data.
+ * @param version version of the symbol. If 0, the library chooses the minimum
+ * version for the given input data.
+ * @param level error correction level.
+ * @throw EINVAL invalid input object.
+ * @throw ENOMEM unable to allocate memory for input objects.
+ * @throw ERANGE input data is too large.
+ */
+extern QRcode *QRcode_encodeData(int size, const unsigned char *data, int version, QRecLevel level);
+
+/**
+ * Micro QR Code version of QRcode_encodeData().
+ * @warning This function is THREAD UNSAFE when pthread is disabled.
+ */
+extern QRcode *QRcode_encodeDataMQR(int size, const unsigned char *data, int version, QRecLevel level);
+
+/**
+ * Free the instance of QRcode class.
+ * @param qrcode an instance of QRcode class.
+ */
+extern void QRcode_free(QRcode *qrcode);
+
+/**
+ * Create structured symbols from the input data.
+ * @warning This function is THREAD UNSAFE when pthread is disabled.
+ * @param s
+ * @return a singly-linked list of QRcode.
+ */
+extern QRcode_List *QRcode_encodeInputStructured(QRinput_Struct *s);
+
+/**
+ * Create structured symbols from the string. The library automatically parses
+ * the input string and encodes in a QR Code symbol.
+ * @warning This function is THREAD UNSAFE when pthread is disabled.
+ * @param string input string. It must be NUL terminated.
+ * @param version version of the symbol.
+ * @param level error correction level.
+ * @param hint tell the library how Japanese Kanji characters should be
+ * encoded. If QR_MODE_KANJI is given, the library assumes that the
+ * given string contains Shift-JIS characters and encodes them in
+ * Kanji-mode. If QR_MODE_8 is given, all of non-alphanumerical
+ * characters will be encoded as is. If you want to embed UTF-8
+ * string, choose this. Other mode will cause EINVAL error.
+ * @param casesensitive case-sensitive(1) or not(0).
+ * @return a singly-linked list of QRcode. On error, NULL is returned, and
+ * errno is set to indicate the error. See Exceptions for the details.
+ * @throw EINVAL invalid input object.
+ * @throw ENOMEM unable to allocate memory for input objects.
+ */
+extern QRcode_List *QRcode_encodeStringStructured(const char *string, int version, QRecLevel level, QRencodeMode hint, int casesensitive);
+
+/**
+ * Same to QRcode_encodeStringStructured(), but encode whole data in 8-bit mode.
+ * @warning This function is THREAD UNSAFE when pthread is disabled.
+ */
+extern QRcode_List *QRcode_encodeString8bitStructured(const char *string, int version, QRecLevel level);
+
+/**
+ * Create structured symbols from byte stream (may include '\0'). Wholde data
+ * are encoded in 8-bit mode.
+ * @warning This function is THREAD UNSAFE when pthread is disabled.
+ * @param size size of the input data.
+ * @param data input dat.
+ * @param version version of the symbol.
+ * @param level error correction level.
+ * @return a singly-linked list of QRcode. On error, NULL is returned, and
+ * errno is set to indicate the error. See Exceptions for the details.
+ * @throw EINVAL invalid input object.
+ * @throw ENOMEM unable to allocate memory for input objects.
+ */
+extern QRcode_List *QRcode_encodeDataStructured(int size, const unsigned char *data, int version, QRecLevel level);
+
+/**
+ * Return the number of symbols included in a QRcode_List.
+ * @param qrlist a head entry of a QRcode_List.
+ * @return number of symbols in the list.
+ */
+extern int QRcode_List_size(QRcode_List *qrlist);
+
+/**
+ * Free the QRcode_List.
+ * @param qrlist a head entry of a QRcode_List.
+ */
+extern void QRcode_List_free(QRcode_List *qrlist);
+
+
+/******************************************************************************
+ * System utilities
+ *****************************************************************************/
+
+/**
+ * Return a string that identifies the library version.
+ * @param major_version
+ * @param minor_version
+ * @param micro_version
+ */
+extern void QRcode_APIVersion(int *major_version, int *minor_version, int *micro_version);
+
+/**
+ * Return a string that identifies the library version.
+ * @return a string identifies the library version. The string is held by the
+ * library. Do NOT free it.
+ */
+extern char *QRcode_APIVersionString(void);
+
+/**
+ * Clear all caches. This is only for debug purpose. If you are attacking a
+ * complicated memory leak bug, try this to reduce the reachable blocks record.
+ * @warning This function is THREAD UNSAFE when pthread is disabled.
+ */
+extern void QRcode_clearCache(void);
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* __QRENCODE_H__ */