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exif-entry.c
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exif-entry.c
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/* exif-entry.c
*
* Copyright (c) 2001 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 <config.h>
#include <libexif/exif-entry.h>
#include <libexif/exif-ifd.h>
#include <libexif/exif-utils.h>
#include <libexif/i18n.h>
#include <ctype.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <math.h>
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
struct _ExifEntryPrivate
{
unsigned int ref_count;
ExifMem *mem;
};
/* This function is hidden in exif-data.c */
ExifLog *exif_data_get_log (ExifData *);
#ifndef NO_VERBOSE_TAG_STRINGS
static void
exif_entry_log (ExifEntry *e, ExifLogCode code, const char *format, ...)
{
va_list args;
ExifLog *l = NULL;
if (e && e->parent && e->parent->parent)
l = exif_data_get_log (e->parent->parent);
va_start (args, format);
exif_logv (l, code, "ExifEntry", format, args);
va_end (args);
}
#else
#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
#define exif_entry_log(...) do { } while (0)
#elif defined(__GNUC__)
#define exif_entry_log(x...) do { } while (0)
#else
#define exif_entry_log (void)
#endif
#endif
static void *
exif_entry_alloc (ExifEntry *e, unsigned int i)
{
void *d;
ExifLog *l = NULL;
if (!e || !e->priv || !i) return NULL;
d = exif_mem_alloc (e->priv->mem, i);
if (d) return d;
if (e->parent && e->parent->parent)
l = exif_data_get_log (e->parent->parent);
EXIF_LOG_NO_MEMORY (l, "ExifEntry", i);
return NULL;
}
static void *
exif_entry_realloc (ExifEntry *e, void *d_orig, unsigned int i)
{
void *d;
ExifLog *l = NULL;
if (!e || !e->priv) return NULL;
if (!i) { exif_mem_free (e->priv->mem, d_orig); return NULL; }
d = exif_mem_realloc (e->priv->mem, d_orig, i);
if (d) return d;
if (e->parent && e->parent->parent)
l = exif_data_get_log (e->parent->parent);
EXIF_LOG_NO_MEMORY (l, "ExifEntry", i);
return NULL;
}
ExifEntry *
exif_entry_new (void)
{
ExifMem *mem = exif_mem_new_default ();
ExifEntry *e = exif_entry_new_mem (mem);
exif_mem_unref (mem);
return e;
}
ExifEntry *
exif_entry_new_mem (ExifMem *mem)
{
ExifEntry *e = NULL;
e = exif_mem_alloc (mem, sizeof (ExifEntry));
if (!e) return NULL;
e->priv = exif_mem_alloc (mem, sizeof (ExifEntryPrivate));
if (!e->priv) { exif_mem_free (mem, e); return NULL; }
e->priv->ref_count = 1;
e->priv->mem = mem;
exif_mem_ref (mem);
return e;
}
void
exif_entry_ref (ExifEntry *e)
{
if (!e) return;
e->priv->ref_count++;
}
void
exif_entry_unref (ExifEntry *e)
{
if (!e) return;
e->priv->ref_count--;
if (!e->priv->ref_count)
exif_entry_free (e);
}
void
exif_entry_free (ExifEntry *e)
{
if (!e) return;
if (e->priv) {
ExifMem *mem = e->priv->mem;
if (e->data)
exif_mem_free (mem, e->data);
exif_mem_free (mem, e->priv);
exif_mem_free (mem, e);
exif_mem_unref (mem);
}
}
static void
clear_entry (ExifEntry *e)
{
e->components = 0;
e->size = 0;
}
/*! Get a value and convert it to an ExifShort.
* \bug Not all types are converted that could be converted and no indication
* is made when that occurs
*/
static inline ExifShort
exif_get_short_convert (const unsigned char *buf, ExifFormat format,
ExifByteOrder order)
{
switch (format) {
case EXIF_FORMAT_LONG:
return (ExifShort) exif_get_long (buf, order);
case EXIF_FORMAT_SLONG:
return (ExifShort) exif_get_slong (buf, order);
case EXIF_FORMAT_SHORT:
return (ExifShort) exif_get_short (buf, order);
case EXIF_FORMAT_SSHORT:
return (ExifShort) exif_get_sshort (buf, order);
case EXIF_FORMAT_BYTE:
case EXIF_FORMAT_SBYTE:
return (ExifShort) buf[0];
default:
/* Unsupported type */
return (ExifShort) 0;
}
}
void
exif_entry_fix (ExifEntry *e)
{
unsigned int i, newsize;
unsigned char *newdata;
ExifByteOrder o;
ExifRational r;
ExifSRational sr;
if (!e || !e->priv) return;
switch (e->tag) {
/* These tags all need to be of format SHORT. */
case EXIF_TAG_YCBCR_SUB_SAMPLING:
case EXIF_TAG_SUBJECT_AREA:
case EXIF_TAG_COLOR_SPACE:
case EXIF_TAG_PLANAR_CONFIGURATION:
case EXIF_TAG_SENSING_METHOD:
case EXIF_TAG_ORIENTATION:
case EXIF_TAG_YCBCR_POSITIONING:
case EXIF_TAG_PHOTOMETRIC_INTERPRETATION:
case EXIF_TAG_CUSTOM_RENDERED:
case EXIF_TAG_EXPOSURE_MODE:
case EXIF_TAG_WHITE_BALANCE:
case EXIF_TAG_SCENE_CAPTURE_TYPE:
case EXIF_TAG_GAIN_CONTROL:
case EXIF_TAG_SATURATION:
case EXIF_TAG_CONTRAST:
case EXIF_TAG_SHARPNESS:
case EXIF_TAG_ISO_SPEED_RATINGS:
switch (e->format) {
case EXIF_FORMAT_LONG:
case EXIF_FORMAT_SLONG:
case EXIF_FORMAT_BYTE:
case EXIF_FORMAT_SBYTE:
case EXIF_FORMAT_SSHORT:
if (!e->parent || !e->parent->parent) break;
exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
_("Tag '%s' was of format '%s' (which is "
"against specification) and has been "
"changed to format '%s'."),
exif_tag_get_name_in_ifd(e->tag,
exif_entry_get_ifd(e)),
exif_format_get_name (e->format),
exif_format_get_name (EXIF_FORMAT_SHORT));
o = exif_data_get_byte_order (e->parent->parent);
newsize = e->components * exif_format_get_size (EXIF_FORMAT_SHORT);
newdata = exif_entry_alloc (e, newsize);
if (!newdata) {
exif_entry_log (e, EXIF_LOG_CODE_NO_MEMORY,
"Could not allocate %lu byte(s).", (unsigned long)newsize);
break;
}
for (i = 0; i < e->components; i++)
exif_set_short (
newdata + i *
exif_format_get_size (
EXIF_FORMAT_SHORT), o,
exif_get_short_convert (
e->data + i *
exif_format_get_size (e->format),
e->format, o));
exif_mem_free (e->priv->mem, e->data);
e->data = newdata;
e->size = newsize;
e->format = EXIF_FORMAT_SHORT;
break;
case EXIF_FORMAT_SHORT:
/* No conversion necessary */
break;
default:
exif_entry_log (e, EXIF_LOG_CODE_CORRUPT_DATA,
_("Tag '%s' is of format '%s' (which is "
"against specification) but cannot be changed "
"to format '%s'."),
exif_tag_get_name_in_ifd(e->tag,
exif_entry_get_ifd(e)),
exif_format_get_name (e->format),
exif_format_get_name (EXIF_FORMAT_SHORT));
break;
}
break;
/* All these tags need to be of format 'Rational'. */
case EXIF_TAG_FNUMBER:
case EXIF_TAG_APERTURE_VALUE:
case EXIF_TAG_EXPOSURE_TIME:
case EXIF_TAG_FOCAL_LENGTH:
switch (e->format) {
case EXIF_FORMAT_SRATIONAL:
if (!e->parent || !e->parent->parent) break;
o = exif_data_get_byte_order (e->parent->parent);
for (i = 0; i < e->components; i++) {
sr = exif_get_srational (e->data + i *
exif_format_get_size (
EXIF_FORMAT_SRATIONAL), o);
r.numerator = (ExifLong) sr.numerator;
r.denominator = (ExifLong) sr.denominator;
exif_set_rational (e->data + i *
exif_format_get_size (
EXIF_FORMAT_RATIONAL), o, r);
}
e->format = EXIF_FORMAT_RATIONAL;
exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
_("Tag '%s' was of format '%s' (which is "
"against specification) and has been "
"changed to format '%s'."),
exif_tag_get_name_in_ifd(e->tag,
exif_entry_get_ifd(e)),
exif_format_get_name (EXIF_FORMAT_SRATIONAL),
exif_format_get_name (EXIF_FORMAT_RATIONAL));
break;
default:
break;
}
break;
/* All these tags need to be of format 'SRational'. */
case EXIF_TAG_EXPOSURE_BIAS_VALUE:
case EXIF_TAG_BRIGHTNESS_VALUE:
case EXIF_TAG_SHUTTER_SPEED_VALUE:
switch (e->format) {
case EXIF_FORMAT_RATIONAL:
if (!e->parent || !e->parent->parent) break;
o = exif_data_get_byte_order (e->parent->parent);
for (i = 0; i < e->components; i++) {
r = exif_get_rational (e->data + i *
exif_format_get_size (
EXIF_FORMAT_RATIONAL), o);
sr.numerator = (ExifLong) r.numerator;
sr.denominator = (ExifLong) r.denominator;
exif_set_srational (e->data + i *
exif_format_get_size (
EXIF_FORMAT_SRATIONAL), o, sr);
}
e->format = EXIF_FORMAT_SRATIONAL;
exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
_("Tag '%s' was of format '%s' (which is "
"against specification) and has been "
"changed to format '%s'."),
exif_tag_get_name_in_ifd(e->tag,
exif_entry_get_ifd(e)),
exif_format_get_name (EXIF_FORMAT_RATIONAL),
exif_format_get_name (EXIF_FORMAT_SRATIONAL));
break;
default:
break;
}
break;
case EXIF_TAG_USER_COMMENT:
/* Format needs to be UNDEFINED. */
if (e->format != EXIF_FORMAT_UNDEFINED) {
exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
_("Tag 'UserComment' had invalid format '%s'. "
"Format has been set to 'undefined'."),
exif_format_get_name (e->format));
e->format = EXIF_FORMAT_UNDEFINED;
}
/* Some packages like Canon ZoomBrowser EX 4.5 store
only one zero byte followed by 7 bytes of rubbish */
if ((e->size >= 8) && (e->data[0] == 0)) {
memcpy(e->data, "\0\0\0\0\0\0\0\0", 8);
}
/* There need to be at least 8 bytes. */
if (e->size < 8) {
e->data = exif_entry_realloc (e, e->data, 8 + e->size);
if (!e->data) {
clear_entry(e);
return;
}
/* Assume ASCII */
memmove (e->data + 8, e->data, e->size);
memcpy (e->data, "ASCII\0\0\0", 8);
e->size += 8;
e->components += 8;
exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
_("Tag 'UserComment' has been expanded to at "
"least 8 bytes in order to follow the "
"specification."));
break;
}
/*
* If the first 8 bytes are empty and real data starts
* afterwards, let's assume ASCII and claim the 8 first
* bytes for the format specifyer.
*/
for (i = 0; (i < e->size) && !e->data[i]; i++);
if (!i) for ( ; (i < e->size) && (e->data[i] == ' '); i++);
if ((i >= 8) && (i < e->size)) {
exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
_("Tag 'UserComment' is not empty but does not "
"start with a format identifier. "
"This has been fixed."));
memcpy (e->data, "ASCII\0\0\0", 8);
break;
}
/*
* First 8 bytes need to follow the specification. If they don't,
* assume ASCII.
*/
if (memcmp (e->data, "ASCII\0\0\0" , 8) &&
memcmp (e->data, "UNICODE\0" , 8) &&
memcmp (e->data, "JIS\0\0\0\0\0" , 8) &&
memcmp (e->data, "\0\0\0\0\0\0\0\0", 8)) {
e->data = exif_entry_realloc (e, e->data, 8 + e->size);
if (!e->data) {
clear_entry(e);
break;
}
/* Assume ASCII */
memmove (e->data + 8, e->data, e->size);
memcpy (e->data, "ASCII\0\0\0", 8);
e->size += 8;
e->components += 8;
exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
_("Tag 'UserComment' did not start with a "
"format identifier. This has been fixed."));
break;
}
break;
default:
break;
}
}
/*! Format the value of an ExifEntry for human display in a generic way.
* The output is localized. The formatting is independent of the tag number
* and is based entirely on the data type.
* \pre The ExifEntry is already a member of an ExifData.
* \param[in] e EXIF entry
* \param[out] val buffer in which to store value
* \param[in] maxlen the length of the buffer val
*/
static void
exif_entry_format_value(ExifEntry *e, char *val, size_t maxlen)
{
ExifByte v_byte;
ExifShort v_short;
ExifSShort v_sshort;
ExifLong v_long;
ExifRational v_rat;
ExifSRational v_srat;
ExifSLong v_slong;
unsigned int i;
size_t len;
const ExifByteOrder o = exif_data_get_byte_order (e->parent->parent);
if (!e->size || !maxlen)
return;
switch (e->format) {
case EXIF_FORMAT_UNDEFINED:
snprintf (val, maxlen, _("%i bytes undefined data"), e->size);
break;
case EXIF_FORMAT_BYTE:
case EXIF_FORMAT_SBYTE:
v_byte = e->data[0];
snprintf (val, maxlen, "0x%02x", v_byte);
len = strlen (val);
for (i = 1; i < e->components; i++) {
v_byte = e->data[i];
snprintf (val+len, maxlen-len, ", 0x%02x", v_byte);
len += strlen (val+len);
if (len >= maxlen-1) break;
}
break;
case EXIF_FORMAT_SHORT:
v_short = exif_get_short (e->data, o);
snprintf (val, maxlen, "%u", v_short);
len = strlen (val);
for (i = 1; i < e->components; i++) {
v_short = exif_get_short (e->data +
exif_format_get_size (e->format) * i, o);
snprintf (val+len, maxlen-len, ", %u", v_short);
len += strlen (val+len);
if (len >= maxlen-1) break;
}
break;
case EXIF_FORMAT_SSHORT:
v_sshort = exif_get_sshort (e->data, o);
snprintf (val, maxlen, "%i", v_sshort);
len = strlen (val);
for (i = 1; i < e->components; i++) {
v_sshort = exif_get_short (e->data +
exif_format_get_size (e->format) *
i, o);
snprintf (val+len, maxlen-len, ", %i", v_sshort);
len += strlen (val+len);
if (len >= maxlen-1) break;
}
break;
case EXIF_FORMAT_LONG:
v_long = exif_get_long (e->data, o);
snprintf (val, maxlen, "%lu", (unsigned long) v_long);
len = strlen (val);
for (i = 1; i < e->components; i++) {
v_long = exif_get_long (e->data +
exif_format_get_size (e->format) *
i, o);
snprintf (val+len, maxlen-len, ", %lu", (unsigned long) v_long);
len += strlen (val+len);
if (len >= maxlen-1) break;
}
break;
case EXIF_FORMAT_SLONG:
v_slong = exif_get_slong (e->data, o);
snprintf (val, maxlen, "%li", (long) v_slong);
len = strlen (val);
for (i = 1; i < e->components; i++) {
v_slong = exif_get_slong (e->data +
exif_format_get_size (e->format) * i, o);
snprintf (val+len, maxlen-len, ", %li", (long) v_slong);
len += strlen (val+len);
if (len >= maxlen-1) break;
}
break;
case EXIF_FORMAT_ASCII:
strncpy (val, (char *) e->data, MIN (maxlen-1, e->size));
val[MIN (maxlen-1, e->size)] = 0;
break;
case EXIF_FORMAT_RATIONAL:
len = 0;
for (i = 0; i < e->components; i++) {
if (i > 0) {
snprintf (val+len, maxlen-len, ", ");
len += strlen (val+len);
}
v_rat = exif_get_rational (
e->data + 8 * i, o);
if (v_rat.denominator) {
/*
* Choose the number of significant digits to
* display based on the size of the denominator.
* It is scaled so that denominators within the
* range 13..120 will show 2 decimal points.
*/
int decimals = (int)(log10(v_rat.denominator)-0.08+1.0);
snprintf (val+len, maxlen-len, "%2.*f",
decimals,
(double) v_rat.numerator /
(double) v_rat.denominator);
} else
snprintf (val+len, maxlen-len, "%lu/%lu",
(unsigned long) v_rat.numerator,
(unsigned long) v_rat.denominator);
len += strlen (val+len);
if (len >= maxlen-1) break;
}
break;
case EXIF_FORMAT_SRATIONAL:
len = 0;
for (i = 0; i < e->components; i++) {
if (i > 0) {
snprintf (val+len, maxlen-len, ", ");
len += strlen (val+len);
}
v_srat = exif_get_srational (
e->data + 8 * i, o);
if (v_srat.denominator) {
int decimals = (int)(log10(abs(v_srat.denominator))-0.08+1.0);
snprintf (val+len, maxlen-len, "%2.*f",
decimals,
(double) v_srat.numerator /
(double) v_srat.denominator);
} else
snprintf (val+len, maxlen-len, "%li/%li",
(long) v_srat.numerator,
(long) v_srat.denominator);
len += strlen (val+len);
if (len >= maxlen-1) break;
}
break;
case EXIF_FORMAT_DOUBLE:
case EXIF_FORMAT_FLOAT:
default:
snprintf (val, maxlen, _("%i bytes unsupported data type"),
e->size);
break;
}
}
void
exif_entry_dump (ExifEntry *e, unsigned int indent)
{
char buf[1024];
char value[1024];
unsigned int l;
if (!e)
return;
l = MIN(sizeof(buf)-1, 2*indent);
memset(buf, ' ', l);
buf[l] = '\0';
printf ("%sTag: 0x%x ('%s')\n", buf, e->tag,
exif_tag_get_name_in_ifd (e->tag, exif_entry_get_ifd(e)));
printf ("%s Format: %i ('%s')\n", buf, e->format,
exif_format_get_name (e->format));
printf ("%s Components: %i\n", buf, (int) e->components);
printf ("%s Size: %i\n", buf, e->size);
printf ("%s Value: %s\n", buf, exif_entry_get_value (e, value, sizeof(value)));
}
/*! Check if a string consists entirely of a single, repeated character.
* Up to first n bytes are checked.
*
* \param[in] data pointer of string to check
* \param[in] ch character to match
* \param[in] n maximum number of characters to match
*
* \return 0 if the string matches or is of zero length, nonzero otherwise
*/
static int
match_repeated_char(const unsigned char *data, unsigned char ch, size_t n)
{
int i;
for (i=n; i; --i, ++data) {
if (*data == 0) {
i = 0; /* all bytes before NUL matched */
break;
}
if (*data != ch)
break;
}
return i;
}
#define CF(entry,target,v,maxlen) \
{ \
if (entry->format != target) { \
exif_entry_log (entry, EXIF_LOG_CODE_CORRUPT_DATA, \
_("The tag '%s' contains data of an invalid " \
"format ('%s', expected '%s')."), \
exif_tag_get_name (entry->tag), \
exif_format_get_name (entry->format), \
exif_format_get_name (target)); \
break; \
} \
}
#define CC(entry,target,v,maxlen) \
{ \
if (entry->components != target) { \
exif_entry_log (entry, EXIF_LOG_CODE_CORRUPT_DATA, \
_("The tag '%s' contains an invalid number of " \
"components (%i, expected %i)."), \
exif_tag_get_name (entry->tag), \
(int) entry->components, (int) target); \
break; \
} \
}
static const struct {
ExifTag tag;
const char *strings[10];
} list[] = {
#ifndef NO_VERBOSE_TAG_DATA
{ EXIF_TAG_PLANAR_CONFIGURATION,
{ N_("Chunky format"), N_("Planar format"), NULL}},
{ EXIF_TAG_SENSING_METHOD,
{ "", N_("Not defined"), N_("One-chip color area sensor"),
N_("Two-chip color area sensor"), N_("Three-chip color area sensor"),
N_("Color sequential area sensor"), "", N_("Trilinear sensor"),
N_("Color sequential linear sensor"), NULL}},
{ EXIF_TAG_ORIENTATION,
{ "", N_("Top-left"), N_("Top-right"), N_("Bottom-right"),
N_("Bottom-left"), N_("Left-top"), N_("Right-top"),
N_("Right-bottom"), N_("Left-bottom"), NULL}},
{ EXIF_TAG_YCBCR_POSITIONING,
{ "", N_("Centered"), N_("Co-sited"), NULL}},
{ EXIF_TAG_PHOTOMETRIC_INTERPRETATION,
{ N_("Reversed mono"), N_("Normal mono"), N_("RGB"), N_("Palette"), "",
N_("CMYK"), N_("YCbCr"), "", N_("CieLAB"), NULL}},
{ EXIF_TAG_CUSTOM_RENDERED,
{ N_("Normal process"), N_("Custom process"), NULL}},
{ EXIF_TAG_EXPOSURE_MODE,
{ N_("Auto exposure"), N_("Manual exposure"), N_("Auto bracket"), NULL}},
{ EXIF_TAG_WHITE_BALANCE,
{ N_("Auto white balance"), N_("Manual white balance"), NULL}},
{ EXIF_TAG_SCENE_CAPTURE_TYPE,
{ N_("Standard"), N_("Landscape"), N_("Portrait"),
N_("Night scene"), NULL}},
{ EXIF_TAG_GAIN_CONTROL,
{ N_("Normal"), N_("Low gain up"), N_("High gain up"),
N_("Low gain down"), N_("High gain down"), NULL}},
{ EXIF_TAG_SATURATION,
{ N_("Normal"), N_("Low saturation"), N_("High saturation"), NULL}},
{ EXIF_TAG_CONTRAST , {N_("Normal"), N_("Soft"), N_("Hard"), NULL}},
{ EXIF_TAG_SHARPNESS, {N_("Normal"), N_("Soft"), N_("Hard"), NULL}},
#endif
{ 0, {NULL}}
};
static const struct {
ExifTag tag;
struct {
ExifShort index;
const char *values[4]; /*!< list of progressively shorter string
descriptions; the longest one that fits will be
selected */
} elem[25];
} list2[] = {
#ifndef NO_VERBOSE_TAG_DATA
{ EXIF_TAG_METERING_MODE,
{ { 0, {N_("Unknown"), NULL}},
{ 1, {N_("Average"), N_("Avg"), NULL}},
{ 2, {N_("Center-weighted average"), N_("Center-weight"), NULL}},
{ 3, {N_("Spot"), NULL}},
{ 4, {N_("Multi spot"), NULL}},
{ 5, {N_("Pattern"), NULL}},
{ 6, {N_("Partial"), NULL}},
{255, {N_("Other"), NULL}},
{ 0, {NULL}}}},
{ EXIF_TAG_COMPRESSION,
{ {1, {N_("Uncompressed"), NULL}},
{5, {N_("LZW compression"), NULL}},
{6, {N_("JPEG compression"), NULL}},
{7, {N_("JPEG compression"), NULL}},
{8, {N_("Deflate/ZIP compression"), NULL}},
{32773, {N_("PackBits compression"), NULL}},
{0, {NULL}}}},
{ EXIF_TAG_LIGHT_SOURCE,
{ { 0, {N_("Unknown"), NULL}},
{ 1, {N_("Daylight"), NULL}},
{ 2, {N_("Fluorescent"), NULL}},
{ 3, {N_("Tungsten incandescent light"), N_("Tungsten"), NULL}},
{ 4, {N_("Flash"), NULL}},
{ 9, {N_("Fine weather"), NULL}},
{ 10, {N_("Cloudy weather"), N_("Cloudy"), NULL}},
{ 11, {N_("Shade"), NULL}},
{ 12, {N_("Daylight fluorescent"), NULL}},
{ 13, {N_("Day white fluorescent"), NULL}},
{ 14, {N_("Cool white fluorescent"), NULL}},
{ 15, {N_("White fluorescent"), NULL}},
{ 17, {N_("Standard light A"), NULL}},
{ 18, {N_("Standard light B"), NULL}},
{ 19, {N_("Standard light C"), NULL}},
{ 20, {N_("D55"), NULL}},
{ 21, {N_("D65"), NULL}},
{ 22, {N_("D75"), NULL}},
{ 24, {N_("ISO studio tungsten"),NULL}},
{255, {N_("Other"), NULL}},
{ 0, {NULL}}}},
{ EXIF_TAG_FOCAL_PLANE_RESOLUTION_UNIT,
{ {2, {N_("Inch"), N_("in"), NULL}},
{3, {N_("Centimeter"), N_("cm"), NULL}},
{0, {NULL}}}},
{ EXIF_TAG_RESOLUTION_UNIT,
{ {2, {N_("Inch"), N_("in"), NULL}},
{3, {N_("Centimeter"), N_("cm"), NULL}},
{0, {NULL}}}},
{ EXIF_TAG_EXPOSURE_PROGRAM,
{ {0, {N_("Not defined"), NULL}},
{1, {N_("Manual"), NULL}},
{2, {N_("Normal program"), N_("Normal"), NULL}},
{3, {N_("Aperture priority"), N_("Aperture"), NULL}},
{4, {N_("Shutter priority"),N_("Shutter"), NULL}},
{5, {N_("Creative program (biased toward depth of field)"),
N_("Creative"), NULL}},
{6, {N_("Creative program (biased toward fast shutter speed)"),
N_("Action"), NULL}},
{7, {N_("Portrait mode (for closeup photos with the background out "
"of focus)"), N_("Portrait"), NULL}},
{8, {N_("Landscape mode (for landscape photos with the background "
"in focus)"), N_("Landscape"), NULL}},
{0, {NULL}}}},
{ EXIF_TAG_SENSITIVITY_TYPE,
{ {0, {N_("Unknown"), NULL}},
{1, {N_("Standard output sensitivity (SOS)"), NULL}},
{2, {N_("Recommended exposure index (REI)"), NULL}},
{3, {N_("ISO speed"), NULL}},
{4, {N_("Standard output sensitivity (SOS) and recommended exposure index (REI)"), NULL}},
{5, {N_("Standard output sensitivity (SOS) and ISO speed"), NULL}},
{6, {N_("Recommended exposure index (REI) and ISO speed"), NULL}},
{7, {N_("Standard output sensitivity (SOS) and recommended exposure index (REI) and ISO speed"), NULL}},
{0, {NULL}}}},
{ EXIF_TAG_FLASH,
{ {0x0000, {N_("Flash did not fire"), N_("No flash"), NULL}},
{0x0001, {N_("Flash fired"), N_("Flash"), N_("Yes"), NULL}},
{0x0005, {N_("Strobe return light not detected"), N_("Without strobe"),
NULL}},
{0x0007, {N_("Strobe return light detected"), N_("With strobe"), NULL}},
{0x0008, {N_("Flash did not fire"), NULL}}, /* Olympus E-330 */
{0x0009, {N_("Flash fired, compulsory flash mode"), NULL}},
{0x000d, {N_("Flash fired, compulsory flash mode, return light "
"not detected"), NULL}},
{0x000f, {N_("Flash fired, compulsory flash mode, return light "
"detected"), NULL}},
{0x0010, {N_("Flash did not fire, compulsory flash mode"), NULL}},
{0x0018, {N_("Flash did not fire, auto mode"), NULL}},
{0x0019, {N_("Flash fired, auto mode"), NULL}},
{0x001d, {N_("Flash fired, auto mode, return light not detected"),
NULL}},
{0x001f, {N_("Flash fired, auto mode, return light detected"), NULL}},
{0x0020, {N_("No flash function"),NULL}},
{0x0041, {N_("Flash fired, red-eye reduction mode"), NULL}},
{0x0045, {N_("Flash fired, red-eye reduction mode, return light "
"not detected"), NULL}},
{0x0047, {N_("Flash fired, red-eye reduction mode, return light "
"detected"), NULL}},
{0x0049, {N_("Flash fired, compulsory flash mode, red-eye reduction "
"mode"), NULL}},
{0x004d, {N_("Flash fired, compulsory flash mode, red-eye reduction "
"mode, return light not detected"), NULL}},
{0x004f, {N_("Flash fired, compulsory flash mode, red-eye reduction mode, "
"return light detected"), NULL}},
{0x0058, {N_("Flash did not fire, auto mode, red-eye reduction mode"), NULL}},
{0x0059, {N_("Flash fired, auto mode, red-eye reduction mode"), NULL}},
{0x005d, {N_("Flash fired, auto mode, return light not detected, "
"red-eye reduction mode"), NULL}},
{0x005f, {N_("Flash fired, auto mode, return light detected, "
"red-eye reduction mode"), NULL}},
{0x0000, {NULL}}}},
{ EXIF_TAG_SUBJECT_DISTANCE_RANGE,
{ {0, {N_("Unknown"), N_("?"), NULL}},
{1, {N_("Macro"), NULL}},
{2, {N_("Close view"), N_("Close"), NULL}},
{3, {N_("Distant view"), N_("Distant"), NULL}},
{0, {NULL}}}},
{ EXIF_TAG_COLOR_SPACE,
{ {1, {N_("sRGB"), NULL}},
{2, {N_("Adobe RGB"), NULL}},
{0xffff, {N_("Uncalibrated"), NULL}},
{0x0000, {NULL}}}},
#endif
{0, { { 0, {NULL}}} }
};
const char *
exif_entry_get_value (ExifEntry *e, char *val, unsigned int maxlen)
{
unsigned int i, j, k;
ExifShort v_short, v_short2, v_short3, v_short4;
ExifByte v_byte;
ExifRational v_rat;
ExifSRational v_srat;
char b[64];
const char *c;
ExifByteOrder o;
double d;
ExifEntry *entry;
static const struct {
char label[5];
char major, minor;
} versions[] = {
{"0110", 1, 1},
{"0120", 1, 2},
{"0200", 2, 0},
{"0210", 2, 1},
{"0220", 2, 2},
{"0221", 2, 21},
{"0230", 2, 3},
{"0231", 2, 31},
{"0232", 2, 32},
{"" , 0, 0}
};
(void) bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
if (!e || !e->parent || !e->parent->parent || !maxlen || !val)
return val;
/* make sure the returned string is zero terminated */
/* FIXME: this is inefficient in the case of long buffers and should
* instead be taken care of on each write instead. */
memset (val, 0, maxlen);
/* We need the byte order */
o = exif_data_get_byte_order (e->parent->parent);
/* Sanity check */
if (e->size != e->components * exif_format_get_size (e->format)) {
snprintf (val, maxlen, _("Invalid size of entry (%i, "
"expected %li x %i)."), e->size, e->components,
exif_format_get_size (e->format));
return val;
}
switch (e->tag) {
case EXIF_TAG_USER_COMMENT:
/*
* The specification says UNDEFINED, but some
* manufacturers don't care and use ASCII. If this is the
* case here, only refuse to read it if there is no chance
* of finding readable data.
*/
if ((e->format != EXIF_FORMAT_ASCII) ||
(e->size <= 8) ||
( memcmp (e->data, "ASCII\0\0\0" , 8) &&
memcmp (e->data, "UNICODE\0" , 8) &&
memcmp (e->data, "JIS\0\0\0\0\0", 8) &&
memcmp (e->data, "\0\0\0\0\0\0\0\0", 8)))
CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
/*
* Note that, according to the specification (V2.1, p 40),
* the user comment field does not have to be
* NULL terminated.
*/
if ((e->size >= 8) && !memcmp (e->data, "ASCII\0\0\0", 8)) {
strncpy (val, (char *) e->data + 8, MIN (e->size - 8, maxlen-1));
break;
}
if ((e->size >= 8) && !memcmp (e->data, "UNICODE\0", 8)) {
strncpy (val, _("Unsupported UNICODE string"), maxlen-1);
/* FIXME: use iconv to convert into the locale encoding.
* EXIF 2.2 implies (but does not say) that this encoding is
* UCS-2.
*/
break;
}
if ((e->size >= 8) && !memcmp (e->data, "JIS\0\0\0\0\0", 8)) {
strncpy (val, _("Unsupported JIS string"), maxlen-1);
/* FIXME: use iconv to convert into the locale encoding */
break;
}
/* Check if there is really some information in the tag. */
for (i = 0; (i < e->size) &&
(!e->data[i] || (e->data[i] == ' ')); i++);
if (i == e->size) break;
/*
* If we reach this point, the tag does not
* comply with the standard but seems to contain data.
* Print as much as possible.
* Note: make sure we do not overwrite the final \0 at maxlen-1
*/
exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
_("Tag UserComment contains data but is "
"against specification."));
for (j = 0; (i < e->size) && (j < maxlen-1); i++, j++) {
exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
_("Byte at position %i: 0x%02x"), i, e->data[i]);
val[j] = isprint (e->data[i]) ? e->data[i] : '.';
}
break;
case EXIF_TAG_EXIF_VERSION:
CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
CC (e, 4, val, maxlen);
strncpy (val, _("Unknown Exif Version"), maxlen-1);
for (i = 0; *versions[i].label; i++) {
if (!memcmp (e->data, versions[i].label, 4)) {
snprintf (val, maxlen,
_("Exif Version %d.%d"),
versions[i].major,
versions[i].minor);
break;
}
}
break;
case EXIF_TAG_FLASH_PIX_VERSION:
CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
CC (e, 4, val, maxlen);
if (!memcmp (e->data, "0100", 4))
strncpy (val, _("FlashPix Version 1.0"), maxlen-1);
else if (!memcmp (e->data, "0101", 4))
strncpy (val, _("FlashPix Version 1.01"), maxlen-1);
else
strncpy (val, _("Unknown FlashPix Version"), maxlen-1);
break;
case EXIF_TAG_COPYRIGHT:
CF (e, EXIF_FORMAT_ASCII, val, maxlen);
/*
* First part: Photographer.
* Some cameras store a string like " " here. Ignore it.
* Remember that a corrupted tag might not be NUL-terminated
*/
if (e->size && e->data && match_repeated_char(e->data, ' ', e->size))
strncpy (val, (char *) e->data, MIN (maxlen-1, e->size));
else
strncpy (val, _("[None]"), maxlen-1);
strncat (val, " ", maxlen-1 - strlen (val));
strncat (val, _("(Photographer)"), maxlen-1 - strlen (val));
/* Second part: Editor. */
strncat (val, " - ", maxlen-1 - strlen (val));
k = 0;
if (e->size && e->data) {
const unsigned char *tagdata = memchr(e->data, 0, e->size);
if (tagdata++) {
unsigned int editor_ofs = tagdata - e->data;
unsigned int remaining = e->size - editor_ofs;