diff options
Diffstat (limited to 'src/exif.c')
-rw-r--r-- | src/exif.c | 577 |
1 files changed, 349 insertions, 228 deletions
@@ -1,6 +1,7 @@ /* exif.c Copyright (C) 2012 Dennis Real. +Copyright (C) 2021 Birte Kristina Friesel. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to @@ -42,199 +43,302 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. /* remove all spaces on the right end of a string */ void exif_trim_spaces(char *str) { - char *end; - - for (end = str; *str!='\0'; str++) - { - if (*str != ' ') - { - end = str + 1; - } - } - *end = '\0'; + char *end; + + for (end = str; *str != '\0'; str++) { + if (*str != ' ') { + end = str + 1; + } + } + *end = '\0'; } /* show given exif tag content with tag name */ -void exif_get_tag(ExifData *d, ExifIfd ifd, ExifTag tag, char* buffer, unsigned int maxsize) +void exif_get_tag(ExifData * d, ExifIfd ifd, ExifTag tag, char *buffer, + unsigned int maxsize) { - char s[EXIF_MAX_DATA]; - ExifEntry *entry = NULL; - - if ( (d != NULL) && (buffer != NULL) && (maxsize > 0) ) - { - entry = exif_content_get_entry(d->ifd[ifd], tag); - if (entry != NULL) - { - /* Get the contents of the tag in human-readable form */ - exif_entry_get_value(entry, s, EXIF_MAX_DATA); - - /* Don't bother printing it if it's entirely blank */ - exif_trim_spaces(s); - if (*s != '\0') - { - D(("%s: %s\n", exif_tag_get_name_in_ifd(tag,ifd), s)); - snprintf(buffer, (size_t)maxsize, "%s: %s\n", exif_tag_get_name_in_ifd(tag,ifd), s); - } - } - } + char s[EXIF_MAX_DATA]; + ExifEntry *entry = NULL; + + if ((d != NULL) && (buffer != NULL) && (maxsize > 0)) { + entry = exif_content_get_entry(d->ifd[ifd], tag); + if (entry != NULL) { + /* Get the contents of the tag in human-readable form */ + exif_entry_get_value(entry, s, EXIF_MAX_DATA); + + /* Don't bother printing it if it's entirely blank */ + exif_trim_spaces(s); + if (*s != '\0') { + D(("%s: %s\n", + exif_tag_get_name_in_ifd(tag, ifd), s)); + snprintf(buffer, (size_t) maxsize, + "%s: %s\n", + exif_tag_get_name_in_ifd(tag, + ifd), s); + } + } + } } /* show given exif tag content without tag name */ -void exif_get_tag_content(ExifData *d, ExifIfd ifd, ExifTag tag, char* buffer, unsigned int maxsize) +void exif_get_tag_content(ExifData * d, ExifIfd ifd, ExifTag tag, + char *buffer, unsigned int maxsize) { - char s[EXIF_MAX_DATA]; - ExifEntry *entry = NULL; - - if ( (d != NULL) && (buffer != NULL) && (maxsize > 0) ) - { - entry = exif_content_get_entry(d->ifd[ifd], tag); - if (entry != NULL) - { - /* Get the contents of the tag in human-readable form */ - exif_entry_get_value(entry, s, EXIF_MAX_DATA); - - /* Don't bother printing it if it's entirely blank */ - exif_trim_spaces(s); - if (*s != '\0') - { - D(("%s - %s\n", exif_tag_get_name_in_ifd(tag,ifd), s)); - snprintf(buffer, (size_t)maxsize, "%s", s); - } - } - } + char s[EXIF_MAX_DATA]; + ExifEntry *entry = NULL; + + if ((d != NULL) && (buffer != NULL) && (maxsize > 0)) { + entry = exif_content_get_entry(d->ifd[ifd], tag); + if (entry != NULL) { + /* Get the contents of the tag in human-readable form */ + exif_entry_get_value(entry, s, EXIF_MAX_DATA); + + /* Don't bother printing it if it's entirely blank */ + exif_trim_spaces(s); + if (*s != '\0') { + D(("%s - %s\n", + exif_tag_get_name_in_ifd(tag, ifd), s)); + snprintf(buffer, (size_t) maxsize, "%s", + s); + } + } + } } /* Show the given MakerNote tag if it exists */ -void exif_get_mnote_tag(ExifData *d, unsigned int tag, char* buffer, unsigned int maxsize) +void exif_get_mnote_tag(ExifData * d, unsigned int tag, char *buffer, + unsigned int maxsize) { - ExifMnoteData *mn = NULL; - int i, num; - char buf[1024]; - - if ( (d!=NULL) && (buffer!=NULL) && (maxsize > 0) ) - { - mn = exif_data_get_mnote_data(d); - } - else - { - return; - } - - if ( mn != NULL ) - { - num = exif_mnote_data_count(mn); - - /* Loop through all MakerNote tags, searching for the desired one */ - for (i=0; i < num; ++i) - { - D(("%d/%d %d 0x%2x %s; %s\n", i, num, exif_mnote_data_get_id(mn, i), - exif_mnote_data_get_id(mn, i), - exif_mnote_data_get_name(mn,i), - exif_mnote_data_get_title(mn, i) )); - - if (exif_mnote_data_get_id(mn, i) == tag) - { - if (exif_mnote_data_get_value(mn, i, buf, sizeof(buf))) - { - /* Don't bother printing it if it's entirely blank */ - exif_trim_spaces(buf); - if (*buf != '\0') - { - D(("%s\n", buf)); - snprintf(buffer, (size_t)maxsize, "%s: %s\n", exif_mnote_data_get_title(mn, i), buf); - } - } - } - } - } + ExifMnoteData *mn = NULL; + int i, num; + char buf[1024]; + + if ((d != NULL) && (buffer != NULL) && (maxsize > 0)) { + mn = exif_data_get_mnote_data(d); + } else { + return; + } + + if (mn != NULL) { + num = exif_mnote_data_count(mn); + + /* Loop through all MakerNote tags, searching for the desired one */ + for (i = 0; i < num; ++i) { + D(("%d/%d %d 0x%2x %s; %s\n", i, num, + exif_mnote_data_get_id(mn, i), + exif_mnote_data_get_id(mn, i), + exif_mnote_data_get_name(mn, i), + exif_mnote_data_get_title(mn, i))); + + if (exif_mnote_data_get_id(mn, i) == tag) { + if (exif_mnote_data_get_value + (mn, i, buf, sizeof(buf))) { + /* Don't bother printing it if it's entirely blank */ + exif_trim_spaces(buf); + if (*buf != '\0') { + D(("%s\n", buf)); + snprintf(buffer, + (size_t) maxsize, + "%s: %s\n", + exif_mnote_data_get_title + (mn, i), buf); + } + } + } + } + } } +void exif_get_make_model_lens(ExifData * ed, char *buffer, unsigned int maxsize) +{ + char make[EXIF_STD_BUF_LEN]; + char model[EXIF_STD_BUF_LEN]; + char lens[EXIF_STD_BUF_LEN]; + unsigned int offset = 0; + + make[0] = model[0] = lens[0] = '\0'; + + exif_get_tag_content(ed, EXIF_IFD_0, EXIF_TAG_MAKE, make, sizeof(make)); + exif_get_tag_content(ed, EXIF_IFD_0, EXIF_TAG_MODEL, model, sizeof(model)); + exif_get_tag_content(ed, EXIF_IFD_EXIF, 0xa434, lens, sizeof(lens)); + + if (make[0] && strncmp(make, model, strlen(make)) != 0) { + offset += snprintf(buffer, maxsize, "%s ", make); + } + if (model[0]) { + offset += snprintf(buffer + offset, maxsize - offset, "%s", model); + } + if (lens[0]) { + offset += snprintf(buffer + offset, maxsize - offset, " + %s", lens); + } + snprintf(buffer + offset, maxsize - offset, "\n"); +} + +void exif_get_exposure(ExifData * ed, char *buffer, unsigned int maxsize) +{ + char fnumber[EXIF_STD_BUF_LEN]; + char exposure[EXIF_STD_BUF_LEN]; + char iso[EXIF_STD_BUF_LEN]; + char focus[EXIF_STD_BUF_LEN]; + char focus35[EXIF_STD_BUF_LEN]; + unsigned int offset = 0; + + fnumber[0] = exposure[0] = iso[0] = '\0'; + focus[0] = focus35[0] = '\0'; + + exif_get_tag_content(ed, EXIF_IFD_EXIF, EXIF_TAG_FNUMBER, fnumber, sizeof(fnumber)); + exif_get_tag_content(ed, EXIF_IFD_EXIF, EXIF_TAG_EXPOSURE_TIME, exposure, sizeof(exposure)); + exif_get_tag_content(ed, EXIF_IFD_EXIF, EXIF_TAG_ISO_SPEED_RATINGS, iso, sizeof(iso)); + exif_get_tag_content(ed, EXIF_IFD_EXIF, EXIF_TAG_FOCAL_LENGTH, focus, sizeof(focus)); + exif_get_tag_content(ed, EXIF_IFD_EXIF, EXIF_TAG_FOCAL_LENGTH_IN_35MM_FILM, focus35, sizeof(focus35)); + + if (fnumber[0] || exposure[0]) { + offset += snprintf(buffer, maxsize, "%s %s ", fnumber, exposure); + } + if (iso[0]) { + offset += snprintf(buffer + offset, maxsize - offset, "ISO%s ", iso); + } + if (focus[0] && focus35[0]) { + snprintf(buffer + offset, maxsize - offset, "%s (%s mm)\n", focus, focus35); + } else if (focus[0]) { + snprintf(buffer + offset, maxsize - offset, "%s\n", focus); + } +} + +void exif_get_flash(ExifData * ed, char *buffer, unsigned int maxsize) +{ + char flash[EXIF_STD_BUF_LEN]; + + flash[0] = '\0'; + + exif_get_tag_content(ed, EXIF_IFD_EXIF, EXIF_TAG_FLASH, flash, sizeof(flash)); + + if (flash[0]) { + snprintf(buffer, maxsize, "%s\n", flash); + } +} + +void exif_get_mode(ExifData * ed, char *buffer, unsigned int maxsize) +{ + char mode[EXIF_STD_BUF_LEN]; + char program[EXIF_STD_BUF_LEN]; + + mode[0] = program[0] = '\0'; + + exif_get_tag_content(ed, EXIF_IFD_EXIF, EXIF_TAG_EXPOSURE_MODE, mode, sizeof(mode)); + exif_get_tag_content(ed, EXIF_IFD_EXIF, EXIF_TAG_EXPOSURE_PROGRAM, program, sizeof(program)); + + if (mode[0] || program[0]) { + snprintf(buffer, maxsize, "%s (%s)\n", mode, program); + } +} + +void exif_get_datetime(ExifData * ed, char *buffer, unsigned int maxsize) +{ + char datetime[EXIF_STD_BUF_LEN]; + + datetime[0] = '\0'; + + exif_get_tag_content(ed, EXIF_IFD_EXIF, EXIF_TAG_DATE_TIME_ORIGINAL, datetime, sizeof(datetime)); + + if (datetime[0]) { + snprintf(buffer, maxsize, "%s\n", datetime); + } +} + +void exif_get_description(ExifData * ed, char *buffer, unsigned int maxsize) +{ + char description[EXIF_STD_BUF_LEN]; + + description[0] = '\0'; + + exif_get_tag_content(ed, EXIF_IFD_0, EXIF_TAG_IMAGE_DESCRIPTION, description, sizeof(description)); + + if (description[0]) { + snprintf(buffer, maxsize, "\"%s\"\n", description); + } +} /* get gps coordinates if available */ void exif_get_gps_coords(ExifData * ed, char *buffer, unsigned int maxsize) { - char buf[EXIF_STD_BUF_LEN]; - - buf[0] = '\0'; - exif_get_tag_content(ed, EXIF_IFD_GPS, EXIF_TAG_GPS_LATITUDE_REF, buf, sizeof(buf)); - if ( buf[0] != '\0' ) - { - snprintf(buffer + strlen(buffer), maxsize - strlen(buffer), "GPS: %s ", buf); - } - else - { - return; - } - - buf[0] = '\0'; - exif_get_tag_content(ed, EXIF_IFD_GPS, EXIF_TAG_GPS_LATITUDE, buf, sizeof(buf)); - if ( buf[0] != '\0' ) - { - snprintf(buffer + strlen(buffer), maxsize - strlen(buffer), "%s ", buf); - } - else - { - return; - } - - buf[0] = '\0'; - exif_get_tag_content(ed, EXIF_IFD_GPS, EXIF_TAG_GPS_LONGITUDE_REF, buf, sizeof(buf)); - if ( buf[0] != '\0' ) - { - snprintf(buffer + strlen(buffer), maxsize - strlen(buffer), ", %s ", buf); - } - else - { - return; - } - - buf[0] = '\0'; - exif_get_tag_content(ed, EXIF_IFD_GPS, EXIF_TAG_GPS_LONGITUDE, buf, sizeof(buf)); - if ( buf[0] != '\0' ) - { - snprintf(buffer + strlen(buffer), maxsize - strlen(buffer), "%s ", buf); - } - else - { - return; - } - - buf[0] = '\0'; - exif_get_tag_content(ed, EXIF_IFD_GPS, EXIF_TAG_GPS_MAP_DATUM, buf, sizeof(buf)); - if ( buf[0] != '\0' ) - { - snprintf(buffer + strlen(buffer), maxsize - strlen(buffer), "(%s)\n", buf); - } - else - { - return; - } + char buf[EXIF_STD_BUF_LEN]; + + buf[0] = '\0'; + exif_get_tag_content(ed, EXIF_IFD_GPS, EXIF_TAG_GPS_LATITUDE_REF, + buf, sizeof(buf)); + if (buf[0] != '\0') { + snprintf(buffer + strlen(buffer), maxsize - strlen(buffer), + "GPS: %s ", buf); + } else { + return; + } + + buf[0] = '\0'; + exif_get_tag_content(ed, EXIF_IFD_GPS, EXIF_TAG_GPS_LATITUDE, buf, + sizeof(buf)); + if (buf[0] != '\0') { + snprintf(buffer + strlen(buffer), maxsize - strlen(buffer), + "%s ", buf); + } else { + return; + } + + buf[0] = '\0'; + exif_get_tag_content(ed, EXIF_IFD_GPS, EXIF_TAG_GPS_LONGITUDE_REF, + buf, sizeof(buf)); + if (buf[0] != '\0') { + snprintf(buffer + strlen(buffer), maxsize - strlen(buffer), + ", %s ", buf); + } else { + return; + } + + buf[0] = '\0'; + exif_get_tag_content(ed, EXIF_IFD_GPS, EXIF_TAG_GPS_LONGITUDE, buf, + sizeof(buf)); + if (buf[0] != '\0') { + snprintf(buffer + strlen(buffer), maxsize - strlen(buffer), + "%s ", buf); + } else { + return; + } + + buf[0] = '\0'; + exif_get_tag_content(ed, EXIF_IFD_GPS, EXIF_TAG_GPS_MAP_DATUM, buf, + sizeof(buf)); + if (buf[0] != '\0') { + snprintf(buffer + strlen(buffer), maxsize - strlen(buffer), + "(%s)\n", buf); + } else { + return; + } } /* return data structure with exif data if available */ -ExifData * exif_get_data(char *path) +ExifData *exif_get_data(char *path) { - ExifData *ed = NULL; + ExifData *ed = NULL; - /* Load an ExifData object from an EXIF file */ - ed = exif_data_new_from_file(path); - if (ed == NULL) - { - D(("File not readable or no Exif data present in %s\n", path)); - } + /* Load an ExifData object from an EXIF file */ + ed = exif_data_new_from_file(path); + if (ed == NULL) { + D(("File not readable or no Exif data present in %s\n", + path)); + } - return(ed); + return (ed); } @@ -243,76 +347,93 @@ ExifData * exif_get_data(char *path) /* get all exif data in readable form */ void exif_get_info(ExifData * ed, char *buffer, unsigned int maxsize) { - ExifEntry *entry = NULL; - char buf[EXIF_STD_BUF_LEN]; - unsigned short int i = 0; - - if ( (buffer == NULL) || (maxsize == 0) ) - { - return; - } - else if (ed == NULL) - { - snprintf(buffer, (size_t)maxsize, "%s\n", "No Exif data in file."); - return; - } - else - { - /* show normal exif tags. list must be defined in exif_cfg.h */ - while ( (i < USHRT_MAX) && (Exif_tag_list[i].ifd != EXIF_IFD_COUNT) ) - { - exif_get_tag(ed, Exif_tag_list[i].ifd, Exif_tag_list[i].tag, buffer + strlen(buffer), maxsize - strlen(buffer)); - i++; - } - - /* show vendor specific makernote tags */ - entry = exif_content_get_entry(ed->ifd[EXIF_IFD_0], EXIF_TAG_MAKE); - if (entry != NULL) - { - - if (exif_entry_get_value(entry, buf, sizeof(buf))) - { - exif_trim_spaces(buf); - - if ( (strcmp(buf, "NIKON CORPORATION") == 0) - || (strcmp(buf, "Nikon") == 0) - || (strcmp(buf, "NIKON") == 0) - ) - { - /* show nikon makernote exif tags. list must be defined in exif_cfg.h */ - i=0; - while ( (i < USHRT_MAX) && (Exif_makernote_nikon_tag_list[i] != EXIF_NIKON_MAKERNOTE_END) ) - { - exn_get_mnote_nikon_tags(ed, Exif_makernote_nikon_tag_list[i], - buffer + strlen(buffer), maxsize - strlen(buffer)); - i++; - } - - } - else if ( (strcmp(buf, "Canon") == 0) ) - { - /* show canon makernote exif tags. list must be defined in exif_cfg.h */ - i=0; - while ( (i < USHRT_MAX) && (Exif_makernote_canon_tag_list[i] != EXIF_CANON_MAKERNOTE_END) ) - { - exc_get_mnote_canon_tags(ed, Exif_makernote_canon_tag_list[i], - buffer + strlen(buffer), maxsize - strlen(buffer)); - i++; - } - - } - else - { - } - } - - } - - /* show gps coordinates */ - exif_get_gps_coords(ed, buffer + strlen(buffer), maxsize - strlen(buffer)); - - } - + ExifEntry *entry = NULL; + char buf[EXIF_STD_BUF_LEN]; + unsigned short int i = 0; + + if ((buffer == NULL) || (maxsize == 0)) { + return; + } else if (ed == NULL) { + snprintf(buffer, (size_t) maxsize, "%s\n", + "No Exif data in file."); + return; + } + + exif_get_description(ed, buffer + strlen(buffer), + maxsize - strlen(buffer)); + exif_get_make_model_lens(ed, buffer + strlen(buffer), + maxsize - strlen(buffer)); + exif_get_exposure(ed, buffer + strlen(buffer), + maxsize - strlen(buffer)); + exif_get_mode(ed, buffer + strlen(buffer), + maxsize - strlen(buffer)); + exif_get_flash(ed, buffer + strlen(buffer), + maxsize - strlen(buffer)); + exif_get_datetime(ed, buffer + strlen(buffer), + maxsize - strlen(buffer)); + + /* show vendor specific makernote tags */ + entry = + exif_content_get_entry(ed->ifd[EXIF_IFD_0], + EXIF_TAG_MAKE); + if (entry != NULL) { + + if (exif_entry_get_value(entry, buf, sizeof(buf))) { + exif_trim_spaces(buf); + + if ((strcmp(buf, "NIKON CORPORATION") == 0) + || (strcmp(buf, "Nikon") == 0) + || (strcmp(buf, "NIKON") == 0) + ) { + /* show nikon makernote exif tags. list must be defined in exif_cfg.h */ + i = 0; + while ((i < USHRT_MAX) + && + (Exif_makernote_nikon_tag_list + [i] != + EXIF_NIKON_MAKERNOTE_END)) + { + exn_get_mnote_nikon_tags + (ed, + Exif_makernote_nikon_tag_list + [i], + buffer + + strlen(buffer), + maxsize - + strlen(buffer)); + i++; + } + + } else if ((strcmp(buf, "Canon") == 0)) { + /* show canon makernote exif tags. list must be defined in exif_cfg.h */ + i = 0; + while ((i < USHRT_MAX) + && + (Exif_makernote_canon_tag_list + [i] != + EXIF_CANON_MAKERNOTE_END)) + { + exc_get_mnote_canon_tags + (ed, + Exif_makernote_canon_tag_list + [i], + buffer + + strlen(buffer), + maxsize - + strlen(buffer)); + i++; + } + + } else { + } + } + + } + + /* show gps coordinates */ + exif_get_gps_coords(ed, buffer + strlen(buffer), + maxsize - strlen(buffer)); + } #endif |