1 /*! \file exif-utils.h 2 * \brief EXIF data manipulation functions and types 3 */ 4 /* 5 * Copyright (c) 2001 Lutz Mueller <lutz@users.sourceforge.net> 6 * 7 * This library is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2 of the License, or (at your option) any later version. 11 * 12 * This library is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with this library; if not, write to the 19 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 20 * Boston, MA 02110-1301 USA. 21 */ 22 23 #ifndef __EXIF_UTILS_H__ 24 #define __EXIF_UTILS_H__ 25 26 #ifdef __cplusplus 27 extern "C" { 28 #endif /* __cplusplus */ 29 30 #include <libexif/exif-byte-order.h> 31 #include <libexif/exif-format.h> 32 #include <libexif/_stdint.h> 33 34 35 /* If these definitions don't work for you, please let us fix the 36 * macro generating _stdint.h */ 37 38 /*! EXIF Unsigned Byte data type */ 39 typedef unsigned char ExifByte; /* 1 byte */ 40 41 /*! EXIF Signed Byte data type */ 42 typedef signed char ExifSByte; /* 1 byte */ 43 44 /*! EXIF Text String data type */ 45 typedef char * ExifAscii; 46 47 /*! EXIF Unsigned Short data type */ 48 typedef uint16_t ExifShort; /* 2 bytes */ 49 50 /*! EXIF Signed Short data type */ 51 typedef int16_t ExifSShort; /* 2 bytes */ 52 53 /*! EXIF Unsigned Long data type */ 54 typedef uint32_t ExifLong; /* 4 bytes */ 55 56 /*! EXIF Signed Long data type */ 57 typedef int32_t ExifSLong; /* 4 bytes */ 58 59 /*! EXIF Unsigned Rational data type */ 60 typedef struct {ExifLong numerator; ExifLong denominator;} ExifRational; 61 62 typedef char ExifUndefined; /* 1 byte */ 63 64 /*! EXIF Signed Rational data type */ 65 typedef struct {ExifSLong numerator; ExifSLong denominator;} ExifSRational; 66 67 68 /*! Retrieve an #ExifShort value from memory. 69 * 70 * \param[in] b pointer to raw EXIF value in memory 71 * \param[in] order byte order of raw value 72 * \return value 73 */ 74 ExifShort exif_get_short (const unsigned char *b, ExifByteOrder order); 75 76 /*! Retrieve an #ExifSShort value from memory. 77 * 78 * \param[in] b pointer to raw EXIF value in memory 79 * \param[in] order byte order of raw value 80 * \return value 81 */ 82 ExifSShort exif_get_sshort (const unsigned char *b, ExifByteOrder order); 83 84 /*! Retrieve an #ExifLong value from memory. 85 * 86 * \param[in] b pointer to raw EXIF value in memory 87 * \param[in] order byte order of raw value 88 * \return value 89 */ 90 ExifLong exif_get_long (const unsigned char *b, ExifByteOrder order); 91 92 /*! Retrieve an #ExifSLong value from memory. 93 * 94 * \param[in] b pointer to raw EXIF value in memory 95 * \param[in] order byte order of raw value 96 * \return value 97 */ 98 ExifSLong exif_get_slong (const unsigned char *b, ExifByteOrder order); 99 100 /*! Retrieve an #ExifRational value from memory. 101 * 102 * \param[in] b pointer to raw EXIF value in memory 103 * \param[in] order byte order of raw value 104 * \return value 105 */ 106 ExifRational exif_get_rational (const unsigned char *b, ExifByteOrder order); 107 108 /*! Retrieve an #ExifSRational value from memory. 109 * 110 * \param[in] b pointer to raw EXIF value in memory 111 * \param[in] order byte order of raw value 112 * \return value 113 */ 114 ExifSRational exif_get_srational (const unsigned char *b, ExifByteOrder order); 115 116 /*! Store an ExifShort value into memory in EXIF format. 117 * 118 * \param[out] b buffer in which to write raw value 119 * \param[in] order byte order to use 120 * \param[in] value data value to store 121 */ 122 void exif_set_short (unsigned char *b, ExifByteOrder order, 123 ExifShort value); 124 125 /*! Store an ExifSShort value into memory in EXIF format. 126 * 127 * \param[out] b buffer in which to write raw value 128 * \param[in] order byte order to use 129 * \param[in] value data value to store 130 */ 131 void exif_set_sshort (unsigned char *b, ExifByteOrder order, 132 ExifSShort value); 133 134 /*! Store an ExifLong value into memory in EXIF format. 135 * 136 * \param[out] b buffer in which to write raw value 137 * \param[in] order byte order to use 138 * \param[in] value data value to store 139 */ 140 void exif_set_long (unsigned char *b, ExifByteOrder order, 141 ExifLong value); 142 143 /*! Store an ExifSLong value into memory in EXIF format. 144 * 145 * \param[out] b buffer in which to write raw value 146 * \param[in] order byte order to use 147 * \param[in] value data value to store 148 */ 149 void exif_set_slong (unsigned char *b, ExifByteOrder order, 150 ExifSLong value); 151 152 /*! Store an ExifRational value into memory in EXIF format. 153 * 154 * \param[out] b buffer in which to write raw value 155 * \param[in] order byte order to use 156 * \param[in] value data value to store 157 */ 158 void exif_set_rational (unsigned char *b, ExifByteOrder order, 159 ExifRational value); 160 161 /*! Store an ExifSRational value into memory in EXIF format. 162 * 163 * \param[out] b buffer in which to write raw value 164 * \param[in] order byte order to use 165 * \param[in] value data value to store 166 */ 167 void exif_set_srational (unsigned char *b, ExifByteOrder order, 168 ExifSRational value); 169 170 /*! \internal */ 171 void exif_convert_utf16_to_utf8 (char *out, const unsigned short *in, int maxlen); 172 173 /* Please do not use this function outside of the library. */ 174 175 /*! \internal */ 176 void exif_array_set_byte_order (ExifFormat, unsigned char *, unsigned int, 177 ExifByteOrder o_orig, ExifByteOrder o_new); 178 179 #undef MIN 180 #define MIN(a, b) (((a) < (b)) ? (a) : (b)) 181 182 #undef MAX 183 #define MAX(a, b) (((a) > (b)) ? (a) : (b)) 184 185 /* For compatibility with older versions */ 186 187 /*! \deprecated Use EXIF_TAG_SUB_SEC_TIME instead. */ 188 #define EXIF_TAG_SUBSEC_TIME EXIF_TAG_SUB_SEC_TIME 189 190 #ifdef __cplusplus 191 } 192 #endif /* __cplusplus */ 193 194 #endif /* __EXIF_UTILS_H__ */ 195