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android: jpeg: exif: Sanitize ASCII strings with utils::toAscii()

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Use the newly introduced utils::toAscii() utility to remove all
non-ASCII characters for EXIF_FORMAT_ASCII strings.

Signed-off-by: Umang Jain <email@uajain.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
This commit is contained in:
Umang Jain 2020-10-06 11:14:59 +05:30 • committed by Kieran Bingham
parent c57622d95f
commit 6feebf297e
1 changed files with 21 additions and 4 deletions
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25
src/android/jpeg/exif.cpp
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@ -8,6 +8,7 @@
#include "exif.h"
#include "libcamera/internal/log.h"
#include "libcamera/internal/utils.h"
using namespace libcamera;
@ -171,15 +172,31 @@ void Exif::setRational(ExifIfd ifd, ExifTag tag, ExifRational item)
void Exif::setString(ExifIfd ifd, ExifTag tag, ExifFormat format, const std::string &item)
{
/* Pad 1 extra byte for null-terminated string in ASCII format. */
size_t length = format == EXIF_FORMAT_ASCII ?
item.length() + 1 : item.length();
std::string ascii;
size_t length;
const char *str;
if (format == EXIF_FORMAT_ASCII) {
ascii = utils::toAscii(item);
str = ascii.c_str();
/* Pad 1 extra byte to null-terminate the ASCII string. */
length = ascii.length() + 1;
} else {
str = item.c_str();
/*
* Strings stored in different formats (EXIF_FORMAT_UNDEFINED)
* are not null-terminated.
*/
length = item.length();
}
ExifEntry *entry = createEntry(ifd, tag, format, length, length);
if (!entry)
return;
memcpy(entry->data, item.c_str(), length);
memcpy(entry->data, str, length);
exif_entry_unref(entry);
}