--- /dev/null
+/*
+ * write-exif.c
+ *
+ * Placed into the public domain by Daniel Fandrich
+ *
+ * Create a new EXIF data block and write it into a JPEG image file.
+ *
+ * The JPEG image data used in this example is fixed and is guaranteed not
+ * to contain an EXIF tag block already, so it is easy to precompute where
+ * in the file the EXIF data should be. In real life, a library like
+ * libjpeg (included with the exif command-line tool source code) would
+ * be used to write to an existing JPEG file.
+ */
+
+#include <stdio.h>
+#include <assert.h>
+#include <libexif/exif-data.h>
+
+/* this file will be unilaterally overwritten */
+#define FILE_NAME "write-exif.jpg"
+
+/* raw JPEG image data */
+static const unsigned char image_jpg[] = {
+ 0xff, 0xd8, 0xff, 0xe0, 0x00, 0x10, 0x4a, 0x46, 0x49, 0x46, 0x00, 0x01,
+ 0x01, 0x01, 0x00, 0x48, 0x00, 0x48, 0x00, 0x00, 0xff, 0xdb, 0x00, 0x43,
+ 0x00, 0x14, 0x0e, 0x0f, 0x12, 0x0f, 0x0d, 0x14, 0x12, 0x10, 0x12, 0x17,
+ 0x15, 0x14, 0x18, 0x1e, 0x32, 0x21, 0x1e, 0x1c, 0x1c, 0x1e, 0x3d, 0x2c,
+ 0x2e, 0x24, 0x32, 0x49, 0x40, 0x4c, 0x4b, 0x47, 0x40, 0x46, 0x45, 0x50,
+ 0x5a, 0x73, 0x62, 0x50, 0x55, 0x6d, 0x56, 0x45, 0x46, 0x64, 0x88, 0x65,
+ 0x6d, 0x77, 0x7b, 0x81, 0x82, 0x81, 0x4e, 0x60, 0x8d, 0x97, 0x8c, 0x7d,
+ 0x96, 0x73, 0x7e, 0x81, 0x7c, 0xff, 0xc0, 0x00, 0x0b, 0x08, 0x00, 0x40,
+ 0x00, 0x40, 0x01, 0x01, 0x11, 0x00, 0xff, 0xc4, 0x00, 0x1b, 0x00, 0x00,
+ 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x05, 0x06, 0x04, 0x03, 0x07, 0x02, 0x01, 0xff,
+ 0xc4, 0x00, 0x2f, 0x10, 0x00, 0x01, 0x03, 0x03, 0x02, 0x05, 0x03, 0x03,
+ 0x03, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03, 0x11,
+ 0x00, 0x04, 0x05, 0x21, 0x31, 0x06, 0x12, 0x41, 0x51, 0x81, 0x61, 0x71,
+ 0x91, 0x13, 0x32, 0xa1, 0x14, 0x22, 0xc1, 0x15, 0x23, 0x52, 0xd1, 0xf0,
+ 0xff, 0xda, 0x00, 0x08, 0x01, 0x01, 0x00, 0x00, 0x3f, 0x00, 0xb3, 0xa2,
+ 0x8a, 0x28, 0xa2, 0x8a, 0x28, 0xa2, 0x97, 0x64, 0x72, 0xd6, 0x58, 0xd4,
+ 0x8f, 0xd5, 0x3d, 0xca, 0xa5, 0x7d, 0xa8, 0x4e, 0xaa, 0x3e, 0xb0, 0x3a,
+ 0x7a, 0x9d, 0x2b, 0x2d, 0x87, 0x13, 0xe3, 0xaf, 0x9f, 0x0c, 0xb6, 0xb5,
+ 0xb6, 0xe2, 0xb4, 0x48, 0x71, 0x30, 0x14, 0x7b, 0x02, 0x09, 0x14, 0xee,
+ 0x94, 0x64, 0x38, 0x87, 0x1f, 0x8d, 0x5f, 0xd3, 0x7d, 0xe2, 0xa7, 0x46,
+ 0xe8, 0x6c, 0x49, 0x1e, 0xfd, 0x07, 0xb1, 0x33, 0x5f, 0xb8, 0xdc, 0xf5,
+ 0x96, 0x51, 0x7c, 0x96, 0xee, 0x14, 0xba, 0x04, 0xf2, 0x2c, 0x42, 0xa3,
+ 0xd3, 0x70, 0x7c, 0x1a, 0x6d, 0x45, 0x2c, 0xcd, 0xe5, 0x11, 0x89, 0xb1,
+ 0x5b, 0xc4, 0x02, 0xe1, 0xd1, 0xb4, 0xcf, 0xdc, 0xa3, 0xfc, 0x0d, 0xcd,
+ 0x41, 0xde, 0xe3, 0xb2, 0x2e, 0xda, 0x1c, 0xbd, 0xe2, 0x4a, 0x90, 0xe9,
+ 0x04, 0x95, 0x2b, 0xf7, 0x41, 0xd0, 0x18, 0xe8, 0x36, 0x03, 0xc6, 0x91,
+ 0x4a, 0x81, 0x20, 0x82, 0x24, 0x10, 0x66, 0x45, 0x5a, 0xdd, 0xf1, 0x32,
+ 0xff, 0x00, 0xa2, 0x5a, 0x8b, 0x62, 0x57, 0x7d, 0x70, 0x80, 0x93, 0x1a,
+ 0x94, 0x10, 0x79, 0x4a, 0xa3, 0xb9, 0x20, 0xc0, 0xf3, 0xd3, 0x55, 0x59,
+ 0x4e, 0x1c, 0x7a, 0xc7, 0x12, 0x9b, 0xc7, 0x94, 0xa7, 0x2e, 0x14, 0xa9,
+ 0x74, 0x0d, 0x42, 0x01, 0x04, 0xc9, 0x3b, 0x93, 0x30, 0x09, 0xdb, 0x5f,
+ 0x35, 0x9b, 0x85, 0xad, 0xde, 0x7f, 0x39, 0x6e, 0xa6, 0x82, 0xa1, 0xa5,
+ 0x73, 0x2d, 0x40, 0x68, 0x13, 0x06, 0x67, 0xdf, 0x6f, 0x35, 0xe9, 0xb4,
+ 0x52, 0x4c, 0xbe, 0x0c, 0x65, 0x72, 0x16, 0xcf, 0x3a, 0xff, 0x00, 0xf6,
+ 0x5a, 0xd1, 0x4d, 0x11, 0xa1, 0x13, 0x26, 0x0f, 0x73, 0x00, 0x1f, 0x41,
+ 0x5b, 0x72, 0xd6, 0xa2, 0xeb, 0x15, 0x73, 0x6e, 0x13, 0xf7, 0x36, 0x42,
+ 0x40, 0xee, 0x04, 0x8f, 0xc8, 0x15, 0xe4, 0xf5, 0x59, 0xc1, 0x16, 0x0d,
+ 0x3d, 0x70, 0xed, 0xdb, 0x84, 0x29, 0x6c, 0x40, 0x42, 0x3b, 0x13, 0x3f,
+ 0xb8, 0xfc, 0x10, 0x3c, 0xd5, 0xc1, 0x00, 0x88, 0x22, 0x41, 0xef, 0x5f,
+ 0x0d, 0xb4, 0x86, 0x81, 0x0d, 0xa1, 0x28, 0x07, 0x52, 0x12, 0x00, 0x06,
+ 0xba, 0xd1, 0x45, 0x71, 0xb8, 0xb8, 0x6e, 0xd9, 0x85, 0xbc, 0xf2, 0xb9,
+ 0x5b, 0x40, 0x25, 0x47, 0xb0, 0xaf, 0x24, 0x79, 0x48, 0x53, 0xce, 0x29,
+ 0xb4, 0x94, 0xa0, 0xa8, 0x94, 0xa7, 0xb0, 0x27, 0x41, 0xf1, 0x54, 0x9c,
+ 0x09, 0x71, 0xc9, 0x92, 0x7d, 0x82, 0x74, 0x75, 0xa9, 0x1e, 0xa5, 0x27,
+ 0xfd, 0x13, 0x55, 0xd9, 0x3c, 0x83, 0x38, 0xbb, 0x45, 0x5c, 0xbf, 0x3c,
+ 0xa1, 0x40, 0x40, 0x02, 0x54, 0x4f, 0x41, 0x3e, 0x4f, 0x83, 0x5a, 0x2d,
+ 0xae, 0x1b, 0xba, 0xb7, 0x6d, 0xf6, 0x89, 0x28, 0x71, 0x21, 0x49, 0x24,
+ 0x41, 0x83, 0xe9, 0x5d, 0xe9, 0x3f, 0x12, 0x64, 0x97, 0x8b, 0xc6, 0x17,
+ 0x59, 0x03, 0xea, 0xa9, 0x61, 0x08, 0x24, 0x48, 0x04, 0xc9, 0x9f, 0x80,
+ 0x6a, 0x4b, 0x17, 0xc4, 0xd7, 0xac, 0xdf, 0x36, 0xab, 0xbb, 0x85, 0x39,
+ 0x6e, 0xb5, 0x00, 0xe0, 0x50, 0x06, 0x01, 0x3a, 0x91, 0x02, 0x44, 0x6f,
+ 0x02, 0xb7, 0x65, 0xb2, 0x0e, 0x71, 0x25, 0xf3, 0x58, 0xdc, 0x72, 0x8f,
+ 0xe9, 0xc1, 0xe6, 0x52, 0xe0, 0xc2, 0xa3, 0x72, 0x46, 0xe0, 0x0e, 0x83,
+ 0xa9, 0xf1, 0x4b, 0x38, 0x9f, 0x16, 0xde, 0x2e, 0xfd, 0xa4, 0x32, 0x92,
+ 0x1a, 0x5b, 0x40, 0x83, 0xdc, 0x8d, 0x0f, 0x9d, 0x01, 0x3e, 0xf5, 0x83,
+ 0x17, 0x7a, 0xac, 0x76, 0x41, 0x9b, 0xa4, 0xa7, 0x9b, 0xe9, 0xab, 0x51,
+ 0x31, 0x20, 0x82, 0x08, 0xf8, 0x34, 0xf9, 0xdb, 0x97, 0xb8, 0xb7, 0x2c,
+ 0xcd, 0xba, 0x12, 0xa6, 0xec, 0xda, 0x3c, 0xca, 0x13, 0x24, 0x0e, 0xa4,
+ 0x91, 0xa4, 0x9d, 0x87, 0x69, 0xf7, 0xab, 0x74, 0x21, 0x2d, 0xa1, 0x28,
+ 0x4a, 0x42, 0x52, 0x90, 0x02, 0x40, 0xd8, 0x01, 0xb0, 0xae, 0x95, 0x87,
+ 0x29, 0x8f, 0x6f, 0x27, 0x64, 0xe5, 0xb3, 0xc4, 0x80, 0xa8, 0x29, 0x50,
+ 0xdd, 0x24, 0x6c, 0x47, 0xfd, 0xd4, 0xd4, 0x92, 0x78, 0x1e, 0xef, 0xeb,
+ 0x42, 0xae, 0x98, 0x0d, 0x7f, 0x90, 0x0a, 0x27, 0xe2, 0x00, 0xfc, 0xd5,
+ 0x4e, 0x27, 0x11, 0x6d, 0x89, 0x60, 0xb7, 0x6e, 0x92, 0x54, 0xa8, 0xe6,
+ 0x71, 0x5b, 0xa8, 0xff, 0x00, 0x03, 0xd2, 0xbe, 0x73, 0x38, 0x86, 0x72,
+ 0xf6, 0xc1, 0xb7, 0x4f, 0x2a, 0xd1, 0x25, 0x0e, 0x01, 0x25, 0x27, 0xae,
+ 0x9d, 0x41, 0xed, 0xed, 0x52, 0xe8, 0xe0, 0x7b, 0xcf, 0xab, 0x0e, 0x5d,
+ 0x30, 0x96, 0xe7, 0xee, 0x4f, 0x31, 0x57, 0xc1, 0x00, 0x7e, 0x6a, 0xaf,
+ 0x15, 0x8b, 0x63, 0x17, 0x6e, 0x1a, 0x61, 0x24, 0x92, 0x65, 0x6b, 0x3b,
+ 0xa8, 0xf7, 0x3e, 0x9d, 0x87, 0x4a, 0x63, 0x45, 0x14, 0x51, 0x45, 0x14,
+ 0x51, 0x45, 0x7f, 0xff, 0xd9
+};
+
+/* length of data in image_jpg */
+static const unsigned int image_jpg_len = sizeof(image_jpg);
+
+/* dimensions of image */
+static const unsigned int image_jpg_x = 64;
+static const unsigned int image_jpg_y = 64;
+
+/* start of JPEG image data section */
+static const unsigned int image_data_offset = 20;
+#define image_data_len (image_jpg_len - image_data_offset)
+
+/* raw EXIF header data */
+static const unsigned char exif_header[] = {
+ 0xff, 0xd8, 0xff, 0xe1
+};
+/* length of data in exif_header */
+static const unsigned int exif_header_len = sizeof(exif_header);
+
+/* byte order to use in the EXIF block */
+#define BYTE_ORDER EXIF_BYTE_ORDER_INTEL
+
+/* Get an existing tag, or create one if it doesn't exist */
+static ExifEntry *init_tag(ExifData *exif, ExifIfd ifd, ExifTag tag)
+{
+ ExifEntry *entry;
+ if (!((entry = exif_content_get_entry (exif->ifd[ifd], tag)))) {
+ entry = exif_entry_new ();
+ exif_content_add_entry (exif->ifd[ifd], entry);
+ exif_entry_initialize (entry, tag);
+ }
+ assert(entry != NULL); /* catch an out of memory condition */
+ return entry;
+}
+
+int main(int argc, char **argv)
+{
+ int rc = 1;
+ FILE *f;
+ unsigned char *exif_data;
+ unsigned int exif_data_len;
+ ExifEntry *entry;
+ ExifData *exif = exif_data_new();
+ if (!exif) {
+ fprintf(stderr, "Out of memory\n");
+ return 2;
+ }
+
+ /* Set the image options */
+ exif_data_set_option(exif, EXIF_DATA_OPTION_FOLLOW_SPECIFICATION);
+ exif_data_set_data_type(exif, EXIF_DATA_TYPE_COMPRESSED);
+ exif_data_set_byte_order(exif, BYTE_ORDER);
+
+ /* Create the mandatory EXIF fields */
+ exif_data_fix(exif);
+
+ /* All these tags are created with default values by exif_data_fix() */
+ /* Change the data to the correct values for this image. */
+ entry = init_tag(exif, EXIF_IFD_EXIF, EXIF_TAG_PIXEL_X_DIMENSION);
+ exif_set_long(entry->data, BYTE_ORDER, image_jpg_x);
+
+ entry = init_tag(exif, EXIF_IFD_EXIF, EXIF_TAG_PIXEL_Y_DIMENSION);
+ exif_set_long(entry->data, BYTE_ORDER, image_jpg_y);
+
+ entry = init_tag(exif, EXIF_IFD_EXIF, EXIF_TAG_COLOR_SPACE);
+ exif_set_short(entry->data, BYTE_ORDER, 1);
+
+ /* A good example to give here would be to add a new tag that isn't
+ * automatically created by exif_data_fix() (such as
+ * EXIF_TAG_USER_COMMENT) which requires allocating memory in
+ * entry->data. This isn't so easy, unfortunately.
+ */
+
+ /* Get a pointer to the EXIF data block we just created */
+ exif_data_save_data(exif, &exif_data, &exif_data_len);
+
+ f = fopen(FILE_NAME, "wb");
+ if (!f) {
+ fprintf(stderr, "Error creating file %s\n", FILE_NAME);
+ exif_data_unref(exif);
+ return rc;
+ }
+ /* Write EXIF header */
+ if (fwrite(exif_header, exif_header_len, 1, f) != 1) {
+ fprintf(stderr, "Error writing to file %s\n", FILE_NAME);
+ goto errout;
+ }
+ /* Write EXIF block length */
+ if (fputc((exif_data_len+2) >> 8, f) < 0) {
+ fprintf(stderr, "Error writing to file %s\n", FILE_NAME);
+ goto errout;
+ }
+ if (fputc((exif_data_len+2) & 0xff, f) < 0) {
+ fprintf(stderr, "Error writing to file %s\n", FILE_NAME);
+ goto errout;
+ }
+ /* Write EXIF data block */
+ if (fwrite(exif_data, exif_data_len, 1, f) != 1) {
+ fprintf(stderr, "Error writing to file %s\n", FILE_NAME);
+ goto errout;
+ }
+ /* Write JPEG image data */
+ if (fwrite(image_jpg+image_data_offset, image_data_len, 1, f) != 1) {
+ fprintf(stderr, "Error writing to file %s\n", FILE_NAME);
+ goto errout;
+ }
+ printf("Wrote file %s\n", FILE_NAME);
+ rc = 0;
+
+errout:
+ if (fclose(f)) {
+ fprintf(stderr, "Error writing to file %s\n", FILE_NAME);
+ rc = 1;
+ }
+ exif_data_unref(exif);
+
+ return rc;
+}
projects / platform / upstream / libexif.git / commitdiff