/* test-value.c
*
* Creates all the types of tags supported in exif_entry_initialize() and
* ensures that exif_entry_get_value() properly truncates the output of each
* one according to the buffer size available.
*
* Copyright 2002 Lutz Mueller <lutz@users.sourceforge.net>
*
* 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 of the License, or (at your option) 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 Street, Fifth Floor,
* Boston, MA 02110-1301 USA.
*/
#include <libexif/exif-utils.h>
#include <libexif/exif-data.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*
* List of tags to test, one per default initialized type.
* There should be one for every block in exif_entry_initialize() and
* exif_entry_get_value().
*/
ExifTag trunc_test_tags[] = {
EXIF_TAG_PIXEL_X_DIMENSION,
EXIF_TAG_SUBJECT_LOCATION,
EXIF_TAG_IMAGE_WIDTH,
EXIF_TAG_ORIENTATION,
EXIF_TAG_SAMPLES_PER_PIXEL,
EXIF_TAG_BITS_PER_SAMPLE,
EXIF_TAG_X_RESOLUTION,
EXIF_TAG_WHITE_POINT,
EXIF_TAG_REFERENCE_BLACK_WHITE,
EXIF_TAG_DATE_TIME,
EXIF_TAG_IMAGE_DESCRIPTION,
EXIF_TAG_EXIF_VERSION,
EXIF_TAG_FLASH_PIX_VERSION,
EXIF_TAG_COPYRIGHT,
EXIF_TAG_FILE_SOURCE,
EXIF_TAG_COMPONENTS_CONFIGURATION,
EXIF_TAG_SCENE_TYPE,
EXIF_TAG_YCBCR_SUB_SAMPLING,
EXIF_TAG_PLANAR_CONFIGURATION,
};
/*
* These tags produce different outputs depending on the amount of buffer space
* available.
*/
ExifTag nonuniform_test_tags[] = {
EXIF_TAG_RESOLUTION_UNIT,
EXIF_TAG_COLOR_SPACE,
EXIF_TAG_METERING_MODE,
};
/*
* These tags need a nonzero rational number to be interesting.
* They must have space for a rational or srational created automatically by
* exif_entry_initialize().
*/
ExifTag rational_test_tags[] = {
EXIF_TAG_FNUMBER,
EXIF_TAG_APERTURE_VALUE,
EXIF_TAG_MAX_APERTURE_VALUE,
EXIF_TAG_FOCAL_LENGTH,
EXIF_TAG_SUBJECT_DISTANCE,
EXIF_TAG_EXPOSURE_TIME,
EXIF_TAG_SHUTTER_SPEED_VALUE,
EXIF_TAG_BRIGHTNESS_VALUE,
EXIF_TAG_EXPOSURE_BIAS_VALUE,
};
/*
* Verify that the entry is properly truncated to the buffer length within
* exif_entry_get_value(). If uniform is zero, then only check that the
* resulting string fits within the buffer and don't check its content.
*/
static void check_entry_trunc(ExifEntry *e, int uniform)
{
unsigned int i;
char v[1024], full[1024]; /* Large enough to never truncate output */
printf ("Tag 0x%x\n", (int) e->tag);
/* Get the full, untruncated string to use as the expected value */
exif_entry_get_value (e, full, sizeof(full));
printf ("Full: '%s'\n", full);
for (i = strlen(full); i > 0; i--) {
/* Make sure the buffer isn't NUL-terminated to begin with */
memset(v, '*', sizeof(v));
exif_entry_get_value (e, v, i);
/* Truncate the full string by one on each iteration */
full[i-1] = '\0';
if ((strlen(v) >= i) || (uniform && strcmp(full, v))) {
printf("Bad truncation!\n");
printf("Length %2i: '%s'\n", i, v);
exit(1);
}
}
}
int
main ()
{
ExifData *data;
ExifEntry *e;
ExifMem *mem;
unsigned i;
static const ExifSRational r = {1., 20.}; /* a nonzero number */
static const char user_comment[] = "ASCII\0\0\0A Long User Comment";
static const char xp_comment[] = "U\0C\0S\0-\0002\0 \0C\0o\0m\0m\0e\0n\0t\0";
static const char interop[] = "R98";
static const char subsec[] = "130 ";
static const ExifRational gpsh = {12., 1.};
static const ExifRational gpsm = {34., 1.};
static const ExifRational gpss = {56780., 1000.};
data = exif_data_new ();
if (!data) {
fprintf (stderr, "Error running exif_data_new()\n");
exit(13);
}
/* Full initialization/truncation tests */
for (i=0; i < sizeof(trunc_test_tags)/sizeof(trunc_test_tags[0]); ++i) {
e = exif_entry_new ();
if (!e) {
fprintf (stderr, "Error running exif_entry_new()\n");
exit(13);
}
exif_content_add_entry (data->ifd[EXIF_IFD_0], e);
exif_entry_initialize (e, trunc_test_tags[i]);
check_entry_trunc(e, 1);
exif_content_remove_entry (data->ifd[EXIF_IFD_0], e);
exif_entry_unref (e);
}
/* Nonuniform initialization/truncation tests */
for (i=0; i < sizeof(nonuniform_test_tags)/sizeof(nonuniform_test_tags[0]);
++i) {
e = exif_entry_new ();
if (!e) {
fprintf (stderr, "Error running exif_entry_new()\n");
exit(13);
}
exif_content_add_entry (data->ifd[EXIF_IFD_0], e);
exif_entry_initialize (e, nonuniform_test_tags[i]);
check_entry_trunc(e, 0);
exif_content_remove_entry (data->ifd[EXIF_IFD_0], e);
exif_entry_unref (e);
}
/* Rational number initialization/truncation tests */
for (i=0; i < sizeof(rational_test_tags)/sizeof(rational_test_tags[0]);
++i) {
e = exif_entry_new ();
if (!e) {
fprintf (stderr, "Error running exif_entry_new()\n");
exit(13);
}
exif_content_add_entry (data->ifd[EXIF_IFD_0], e);
exif_entry_initialize (e, rational_test_tags[i]);
exif_set_srational (e->data, exif_data_get_byte_order (data), r);
/* In case this tag needs an unsigned rational instead,
* fix the type automatically */
exif_entry_fix (e);
check_entry_trunc(e, 1);
exif_content_remove_entry (data->ifd[EXIF_IFD_0], e);
exif_entry_unref (e);
}
/* Create a memory allocator to manage the remaining ExifEntry structs */
mem = exif_mem_new_default();
if (!mem) {
fprintf (stderr, "Out of memory\n");
exit(13);
}
/* EXIF_TAG_SUB_SEC_TIME initialization/truncation tests */
e = exif_entry_new_mem (mem);
if (!e) {
fprintf (stderr, "Out of memory\n");
exit(13);
}
exif_content_add_entry (data->ifd[EXIF_IFD_0], e);
exif_entry_initialize (e, EXIF_TAG_SUB_SEC_TIME);
e->size = sizeof(subsec); /* include NUL */
e->components = e->size;
/* Allocate memory to use for holding the tag data */
e->data = exif_mem_alloc(mem, e->size);
if (!e->data) {
fprintf (stderr, "Out of memory\n");
exit(13);
}
memcpy(e->data, subsec, e->size);
check_entry_trunc(e, 1);
exif_content_remove_entry (data->ifd[EXIF_IFD_0], e);
exif_entry_unref (e);
/* EXIF_TAG_USER_COMMENT initialization/truncation tests */
e = exif_entry_new_mem (mem);
if (!e) {
fprintf (stderr, "Out of memory\n");
exit(13);
}
exif_content_add_entry (data->ifd[EXIF_IFD_0], e);
exif_entry_initialize (e, EXIF_TAG_USER_COMMENT);
e->size = sizeof(user_comment) - 1;
e->components = e->size;
/* Allocate memory to use for holding the tag data */
e->data = exif_mem_alloc(mem, e->size);
if (!e->data) {
fprintf (stderr, "Out of memory\n");
exit(13);
}
memcpy(e->data, user_comment, e->size);
check_entry_trunc(e, 1);
exif_content_remove_entry (data->ifd[EXIF_IFD_0], e);
exif_entry_unref (e);
/* EXIF_TAG_XP_COMMENT truncation tests */
e = exif_entry_new_mem (mem);
if (!e) {
fprintf (stderr, "Out of memory\n");
exit(13);
}
exif_content_add_entry (data->ifd[EXIF_IFD_0], e);
exif_entry_initialize (e, EXIF_TAG_XP_COMMENT);
e->format = EXIF_FORMAT_BYTE;
e->size = sizeof(xp_comment) - 1;
e->components = e->size;
/* Allocate memory to use for holding the tag data */
e->data = exif_mem_alloc(mem, e->size);
if (!e->data) {
fprintf (stderr, "Out of memory\n");
exit(13);
}
memcpy(e->data, xp_comment, e->size);
check_entry_trunc(e, 1);
exif_content_remove_entry (data->ifd[EXIF_IFD_0], e);
exif_entry_unref (e);
/* EXIF_TAG_INTEROPERABILITY_VERSION truncation tests */
e = exif_entry_new_mem (mem);
if (!e) {
fprintf (stderr, "Out of memory\n");
exit(13);
}
exif_content_add_entry (data->ifd[EXIF_IFD_INTEROPERABILITY], e);
exif_entry_initialize (e, EXIF_TAG_INTEROPERABILITY_VERSION);
e->format = EXIF_FORMAT_UNDEFINED; /* The spec says ASCII, but libexif
allows UNDEFINED */
e->size = sizeof(interop); /* include NUL */
e->components = e->size;
/* Allocate memory to use for holding the tag data */
e->data = exif_mem_alloc(mem, e->size);
if (!e->data) {
fprintf (stderr, "Out of memory\n");
exit(13);
}
memcpy(e->data, interop, e->size);
check_entry_trunc(e, 1);
exif_content_remove_entry (data->ifd[EXIF_IFD_INTEROPERABILITY], e);
exif_entry_unref (e);
/* EXIF_TAG_GPS_VERSION_ID truncation tests */
e = exif_entry_new_mem (mem);
if (!e) {
fprintf (stderr, "Out of memory\n");
exit(13);
}
exif_content_add_entry (data->ifd[EXIF_IFD_GPS], e);
exif_entry_initialize (e, EXIF_TAG_GPS_VERSION_ID);
e->format = EXIF_FORMAT_BYTE;
e->size = 4;
e->components = e->size;
/* Allocate memory to use for holding the tag data */
e->data = exif_mem_alloc(mem, e->size);
if (!e->data) {
fprintf (stderr, "Out of memory\n");
exit(13);
}
e->data[0] = 2;
e->data[1] = 2;
e->data[2] = 0;
e->data[3] = 0;
check_entry_trunc(e, 1);
exif_content_remove_entry (data->ifd[EXIF_IFD_GPS], e);
exif_entry_unref (e);
/* EXIF_TAG_GPS_ALTITUDE_REF truncation tests */
e = exif_entry_new_mem (mem);
if (!e) {
fprintf (stderr, "Out of memory\n");
exit(13);
}
exif_content_add_entry (data->ifd[EXIF_IFD_GPS], e);
exif_entry_initialize (e, EXIF_TAG_GPS_ALTITUDE_REF);
e->format = EXIF_FORMAT_BYTE;
e->size = 1;
e->components = e->size;
/* Allocate memory to use for holding the tag data */
e->data = exif_mem_alloc(mem, e->size);
if (!e->data) {
fprintf (stderr, "Out of memory\n");
exit(13);
}
e->data[0] = 1;
check_entry_trunc(e, 1);
exif_content_remove_entry (data->ifd[EXIF_IFD_GPS], e);
exif_entry_unref (e);
/* EXIF_TAG_GPS_TIME_STAMP truncation tests */
e = exif_entry_new_mem (mem);
if (!e) {
fprintf (stderr, "Out of memory\n");
exit(13);
}
exif_content_add_entry (data->ifd[EXIF_IFD_GPS], e);
exif_entry_initialize (e, EXIF_TAG_GPS_TIME_STAMP);
e->format = EXIF_FORMAT_RATIONAL;
e->components = 3;
e->size = e->components * exif_format_get_size(EXIF_FORMAT_RATIONAL);
/* Allocate memory to use for holding the tag data */
e->data = exif_mem_alloc(mem, e->size);
if (!e->data) {
fprintf (stderr, "Out of memory\n");
exit(13);
}
exif_set_rational(e->data, exif_data_get_byte_order (data), gpsh);
exif_set_rational(e->data+8, exif_data_get_byte_order (data), gpsm);
exif_set_rational(e->data+16, exif_data_get_byte_order (data), gpss);
check_entry_trunc(e, 1);
exif_content_remove_entry (data->ifd[EXIF_IFD_GPS], e);
exif_entry_unref (e);
/* EXIF_TAG_SUBJECT_AREA truncation tests */
e = exif_entry_new_mem (mem);
if (!e) {
fprintf (stderr, "Out of memory\n");
exit(13);
}
exif_content_add_entry (data->ifd[EXIF_IFD_0], e);
exif_entry_initialize (e, EXIF_TAG_SUBJECT_AREA);
e->format = EXIF_FORMAT_SHORT;
/* This tags is interpreted differently depending on # components */
/* Rectangle */
e->components = 4;
e->size = e->components * exif_format_get_size(EXIF_FORMAT_SHORT);
/* Allocate memory to use for holding the tag data */
e->data = exif_mem_alloc(mem, e->size);
if (!e->data) {
fprintf (stderr, "Out of memory\n");
exit(13);
}
exif_set_short(e->data, exif_data_get_byte_order (data), 123);
exif_set_short(e->data+2, exif_data_get_byte_order (data), 456);
exif_set_short(e->data+4, exif_data_get_byte_order (data), 78);
exif_set_short(e->data+6, exif_data_get_byte_order (data), 90);
check_entry_trunc(e, 1);
/* Circle */
e->components = 3;
e->size = e->components * exif_format_get_size(EXIF_FORMAT_SHORT);
check_entry_trunc(e, 1);
/* Centre */
e->components = 2;
e->size = e->components * exif_format_get_size(EXIF_FORMAT_SHORT);
check_entry_trunc(e, 1);
/* Invalid */
e->components = 1;
e->size = e->components * exif_format_get_size(EXIF_FORMAT_SHORT);
check_entry_trunc(e, 1);
exif_content_remove_entry (data->ifd[EXIF_IFD_0], e);
exif_entry_unref (e);
exif_mem_unref(mem);
exif_data_unref (data);
return 0;
}