On Jun 3, 2008, at 11:14 AM, Randall Meadows wrote:
I'm about to resort to using a third-part solution (jpegtran and
jpegexiforient) that I've found, but
Except that I'm not going to be able to use jpegexiforient, because
the image file apparently isn't in the correct form it wants. This
test fails:
/* Read File head, check for JPEG SOI + Exif APP1 */
for (i = 0; i < 4; i++)
exif_data[i] = (unsigned char) read_1_byte();
if (exif_data[0] != 0xFF ||
exif_data[1] != 0xD8 ||
exif_data[2] != 0xFF ||
exif_data[3] != 0xE1)
return 0;
since the 4th byte (exif_data[3]) is 0xE0. I don't really know what
that means, other than I guess I'm back to square one trying to rotate
an image, and update and preserve all the meta-data.
Guess I'm off to read the spec, unless anyone's got any great ideas
for me. Please? Pretty please?
randy
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