void
exif_data_load_data (ExifData *data, const unsigned char *d_orig,
unsigned int ds_orig)
{
unsigned int l;
ExifLong offset;
ExifShort n;
const unsigned char *d = d_orig;
unsigned int ds = ds_orig, len;
if (!data || !data->priv || !d || !ds)
return;
exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
"Parsing %i byte(s) EXIF data...\n", ds);
/*
* It can be that the data starts with the EXIF header. If it does
* not, search the EXIF marker.
*/
if (ds < 6) {
LOG_TOO_SMALL;
return;
}
if (!memcmp (d, ExifHeader, 6)) {
exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
"Found EXIF header.");
} else {
while (1) {
while ((d[0] == 0xff) && ds) {
d++;
ds--;
}
/* JPEG_MARKER_SOI */
if (d[0] == JPEG_MARKER_SOI) {
d++;
ds--;
continue;
}
/* JPEG_MARKER_APP0 */
if (d[0] == JPEG_MARKER_APP0) {
d++;
ds--;
l = (d[0] << 8) | d[1];
if (l > ds)
return;
d += l;
ds -= l;
continue;
}
/* JPEG_MARKER_APP1 */
if (d[0] == JPEG_MARKER_APP1)
break;
/* Unknown marker or data. Give up. */
exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifData", _("EXIF marker not found."));
return;
}
d++;
ds--;
if (ds < 2) {
LOG_TOO_SMALL;
return;
}
len = (d[0] << 8) | d[1];
exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
"We have to deal with %i byte(s) of EXIF data.",
len);
d += 2;
ds -= 2;
}
/*
* Verify the exif header
* (offset 2, length 6).
*/
if (ds < 6) {
LOG_TOO_SMALL;
return;
}
if (memcmp (d, ExifHeader, 6)) {
exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifData", _("EXIF header not found."));
return;
}
exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
"Found EXIF header.");
/* Byte order (offset 6, length 2) */
if (ds < 14)
return;
if (!memcmp (d + 6, "II", 2))
data->priv->order = EXIF_BYTE_ORDER_INTEL;
else if (!memcmp (d + 6, "MM", 2))
data->priv->order = EXIF_BYTE_ORDER_MOTOROLA;
else {
exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifData", _("Unknown encoding."));
return;
}
/* Fixed value */
if (exif_get_short (d + 8, data->priv->order) != 0x002a)
return;
/* IFD 0 offset */
offset = exif_get_long (d + 10, data->priv->order);
exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
"IFD 0 at %i.", (int) offset);
/* Parse the actual exif data (usually offset 14 from start) */
exif_data_load_data_content (data, EXIF_IFD_0, d + 6, ds - 6, offset, 0);
/* IFD 1 offset */
if (offset + 6 + 2 > ds) {
return;
}
n = exif_get_short (d + 6 + offset, data->priv->order);
if (offset + 6 + 2 + 12 * n + 4 > ds) {
return;
}
offset = exif_get_long (d + 6 + offset + 2 + 12 * n, data->priv->order);
if (offset) {
exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
"IFD 1 at %i.", (int) offset);
/* Sanity check. */
if (offset > ds - 6) {
exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifData", "Bogus offset of IFD1.");
} else {
exif_data_load_data_content (data, EXIF_IFD_1, d + 6, ds - 6, offset, 0);
}
}
/*
* If we got an EXIF_TAG_MAKER_NOTE, try to interpret it. Some
* cameras use pointers in the maker note tag that point to the
* space between IFDs. Here is the only place where we have access
* to that data.
*/
interpret_maker_note(data, d, ds);
/* Fixup tags if requested */
if (data->priv->options & EXIF_DATA_OPTION_FOLLOW_SPECIFICATION)
exif_data_fix (data);
}
void generateDecryptData(SGeoTagsEncrypt *collection, unsigned char *data, unsigned int size, ExifByteOrder order)
{
ExifEntry *entry = NULL;
ExifData *exif = NULL;
ExifContent *content = NULL;
// create new exif data
exif = exif_data_new_mem (exif_mem_new_default());
exif->priv->order = order;
// fill exif fields
exif_data_load_data_content(exif, EXIF_IFD_ENCRYPT, data, size, 0, 0);
content = exif->ifd[EXIF_IFD_ENCRYPT];
// excrypt version
exif_mem_read(collection->VersionID, NULL, content, SGEO_TAG_ENCRYPT_VERSION, sizeof(collection->VersionID));
// FileName
read_unicode_string_from_exif(content, SGEO_TAG_ENCRYPT_FILE_NAME, collection->FileName, sizeof(collection->FileName) / sizeof(*collection->FileName));
// FileSize
exif_long_read(&collection->FileSize, NULL, content, SGEO_TAG_ENCRYPT_FILE_SIZE, order);
// datetime
exif_mem_read(collection->DateTimeOriginal, &collection->ExistDateTimeOriginal, content, EXIF_TAG_DATE_TIME_ORIGINAL, sizeof(collection->DateTimeOriginal));
// Longitude
exif_srational_read(&collection->Longitude, &collection->ExistLongitude, content, SGEO_TAG_LONGITUDE, order);
// LongAccuracy
exif_rational_read(&collection->LongitudeAccuracy, &collection->ExistLongitudeAccuracy, content, SGEO_TAG_LONGACCURACY, order);
// Latitude
exif_srational_read(&collection->Latitude, &collection->ExistLatitude, content, SGEO_TAG_LATITUDE, order);
// LatAccuracy
exif_rational_read(&collection->LatitudeAccuracy, &collection->ExistLatitudeAccuracy, content, SGEO_TAG_LATACCURACY, order);
// Altitude
exif_srational_read(&collection->Altitude, &collection->ExistAltitude, content, SGEO_TAG_ALTITUDE, order);
// AltAccuracy
exif_rational_read(&collection->AltitudeAccuracy, &collection->ExistAltitudeAccuracy, content, SGEO_TAG_ALTACCURACY, order);
// Azimuth
exif_srational_read(&collection->Altitude, &collection->ExistAltitude, content, SGEO_TAG_ALTITUDE, order);
entry = exif_content_get_entry (content, (ExifTag)(SGEO_TAG_AZIMUTH));
if (entry) collection->Azimuth = exif_get_srational(entry->data, order);
// AzimuthAccuracy
exif_rational_read(&collection->AzimuthAccuracy, &collection->ExistAzimuthAccuracy, content, SGEO_TAG_AZIMUTHACCURACY, order);
// Pitch
exif_srational_read(&collection->Pitch, &collection->ExistPitch, content, SGEO_TAG_PITCH, order);
// PitchAccuracy
exif_rational_read(&collection->PitchAccuracy, &collection->ExistPitchAccuracy, content, SGEO_TAG_PITCHACCURACY, order);
// Roll
exif_srational_read(&collection->Roll, &collection->ExistRoll, content, SGEO_TAG_ROLL, order);
// RollAccuracy
exif_rational_read(&collection->RollAccuracy, &collection->ExistRollAccuracy, content, SGEO_TAG_ROLLACCURACY, order);
// HViewAngle
exif_rational_read(&collection->HViewAngle, &collection->ExistHViewAngle, content, SGEO_TAG_HVIEWANGLE, order);
// HViewAngleAccuracy
exif_rational_read(&collection->HViewAngleAccuracy, &collection->ExistHViewAngleAccuracy, content, SGEO_TAG_HVIEWANGLEACCURACY, order);
// VViewAngle
exif_rational_read(&collection->VViewAngle, &collection->ExistVViewAngle, content, SGEO_TAG_VVIEWANGLE, order);
// VViewAngleAccuracy
exif_rational_read(&collection->VViewAngleAccuracy, &collection->ExistVViewAngleAccuracy, content, SGEO_TAG_VVIEWANGLEACCURACY, order);
// SatCount
exif_mem_read(&collection->SatCount, NULL, content, SGEO_TAG_SATCOUNT, sizeof(collection->SatCount));
// global time
exif_mem_read(&collection->GlobalTime, &collection->ExistGlobalTime, content, SGEO_TAG_GLOBAL_TIME, sizeof(collection->GlobalTime));
// GNSSType
exif_long_read(&collection->GNSSType, NULL, content, SGEO_TAG_GNSS_TYPE, order);
// DeviceName
read_unicode_string_from_exif(content, SGEO_TAG_DEVICE_NAME, collection->DeviceName, sizeof(collection->DeviceName) / sizeof(*collection->DeviceName));
// DeviceIMEI
read_unicode_string_from_exif(content, SGEO_TAG_DEVICE_IMEI, collection->DeviceIMEI, sizeof(collection->DeviceIMEI) / sizeof(*collection->DeviceIMEI));
// DeviceNumber
read_unicode_string_from_exif(content, SGEO_TAG_DEVICE_NUMBER, collection->DeviceNumber, sizeof(collection->DeviceNumber) / sizeof(*collection->DeviceNumber));
// DeviceOS
read_unicode_string_from_exif(content, SGEO_TAG_DEVICE_OS, collection->DeviceOS, sizeof(collection->DeviceOS) / sizeof(*collection->DeviceOS));
// DeviceOSVersion
read_unicode_string_from_exif(content, SGEO_TAG_DEVICE_OS_VERSION, collection->DeviceOSVersion, sizeof(collection->DeviceOSVersion) / sizeof(*collection->DeviceOSVersion));
// DeviceVersion
read_unicode_string_from_exif(content, SGEO_TAG_DEVICE_VERSION, collection->DeviceVersion, sizeof(collection->DeviceVersion) / sizeof(*collection->DeviceVersion));
// DeviceDateTimeMeasure
exif_mem_read(&collection->DeviceDateTimeMeasure, NULL, content, SGEO_TAG_DEVICE_DATE_TIME_MEASURE, sizeof(collection->DeviceDateTimeMeasure));
// ProgramVersion
read_unicode_string_from_exif(content, SGEO_TAG_PROGRAM_VERSION, collection->ProgramVersion, sizeof(collection->ProgramVersion) / sizeof(*collection->ProgramVersion));
// ProgramName
read_unicode_string_from_exif(content, SGEO_TAG_PROGRAM_NAME, collection->ProgramName, sizeof(collection->ProgramName) / sizeof(*collection->ProgramName));
// ProgramUserName
read_unicode_string_from_exif(content, SGEO_TAG_PROGRAM_USER_NAME, collection->ProgramUserName, sizeof(collection->ProgramUserName) / sizeof(*collection->ProgramUserName));
exif_data_unref(exif);
}
/*! Load data for an IFD.
*
* \param[in,out] data #ExifData
* \param[in] ifd IFD to load
* \param[in] d pointer to buffer containing raw IFD data
* \param[in] ds size of raw data in buffer at \c d
* \param[in] offset offset into buffer at \c d at which IFD starts
* \param[in] recursion_depth number of times this function has been
* recursively called without returning
*/
static void
exif_data_load_data_content (ExifData *data, ExifIfd ifd,
const unsigned char *d,
unsigned int ds, unsigned int offset, unsigned int recursion_depth)
{
ExifLong o, thumbnail_offset = 0, thumbnail_length = 0;
ExifShort n;
ExifEntry *entry;
unsigned int i;
ExifTag tag;
if (!data || !data->priv)
return;
/* check for valid ExifIfd enum range */
if ((((int)ifd) < 0) || ( ((int)ifd) >= EXIF_IFD_COUNT))
return;
if (recursion_depth > 30) {
exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData",
"Deep recursion detected!");
return;
}
/* Read the number of entries */
if ((offset + 2 < offset) || (offset + 2 < 2) || (offset + 2 > ds)) {
exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData",
"Tag data past end of buffer (%u > %u)", offset+2, ds);
return;
}
n = exif_get_short (d + offset, data->priv->order);
exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
"Loading %hu entries...", n);
offset += 2;
/* Check if we have enough data. */
if (offset + 12 * n > ds) {
n = (ds - offset) / 12;
exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
"Short data; only loading %hu entries...", n);
}
for (i = 0; i < n; i++) {
tag = exif_get_short (d + offset + 12 * i, data->priv->order);
switch (tag) {
case EXIF_TAG_EXIF_IFD_POINTER:
case EXIF_TAG_GPS_INFO_IFD_POINTER:
case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
o = exif_get_long (d + offset + 12 * i + 8,
data->priv->order);
/* FIXME: IFD_POINTER tags aren't marked as being in a
* specific IFD, so exif_tag_get_name_in_ifd won't work
*/
exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
"Sub-IFD entry 0x%x ('%s') at %u.", tag,
exif_tag_get_name(tag), o);
switch (tag) {
case EXIF_TAG_EXIF_IFD_POINTER:
CHECK_REC (EXIF_IFD_EXIF);
exif_data_load_data_content (data, EXIF_IFD_EXIF, d, ds, o, recursion_depth + 1);
break;
case EXIF_TAG_GPS_INFO_IFD_POINTER:
CHECK_REC (EXIF_IFD_GPS);
exif_data_load_data_content (data, EXIF_IFD_GPS, d, ds, o, recursion_depth + 1);
break;
case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
CHECK_REC (EXIF_IFD_INTEROPERABILITY);
exif_data_load_data_content (data, EXIF_IFD_INTEROPERABILITY, d, ds, o, recursion_depth + 1);
break;
case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
thumbnail_offset = o;
if (thumbnail_offset && thumbnail_length)
exif_data_load_data_thumbnail (data, d,
ds, thumbnail_offset,
thumbnail_length);
break;
case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
thumbnail_length = o;
if (thumbnail_offset && thumbnail_length)
exif_data_load_data_thumbnail (data, d,
ds, thumbnail_offset,
thumbnail_length);
break;
default:
return;
}
break;
default:
/*
* If we don't know the tag, don't fail. It could be that new
* versions of the standard have defined additional tags. Note that
* 0 is a valid tag in the GPS IFD.
*/
if (!exif_tag_get_name_in_ifd (tag, ifd)) {
/*
* Special case: Tag and format 0. That's against specification
* (at least up to 2.2). But Photoshop writes it anyways.
*/
if (!memcmp (d + offset + 12 * i, "\0\0\0\0", 4)) {
exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
"Skipping empty entry at position %u in '%s'.", i,
exif_ifd_get_name (ifd));
break;
}
exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
"Unknown tag 0x%04x (entry %u in '%s'). Please report this tag "
"to <*****@*****.**>.", tag, i,
exif_ifd_get_name (ifd));
if (data->priv->options & EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS)
break;
}
entry = exif_entry_new_mem (data->priv->mem);
if (exif_data_load_data_entry (data, entry, d, ds,
offset + 12 * i))
exif_content_add_entry (data->ifd[ifd], entry);
exif_entry_unref (entry);
break;
}
}
}
