/*
 * Copyright (c) 2004, Eric M. Johnston <emj@postal.net>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Eric M. Johnston.
 * 4. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $Id: leica.c,v 1.4 2004/04/20 22:12:51 ejohnst Exp $
 */
/*
 * Exif tag definitions for Leica maker notes.  Values were derived from
 * a Digilux 2.
 *
 * Note that the Digilux 4.3's maker notes are identical to Fuji's.
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "makers.h"
/* White balance. */
static struct descrip leica_white[] = {
        { 1,    "Auto" },
        { 2,    "Sunshine" },
        { 3,    "Cloudy" },
        { 4,    "Halogen" },
        { 5,    "Manual" },
        { 8,    "Electronic Flash" },
        { 10,   "Black & White" },
        { -1,   "Unknown" },
};
/* Compression rate. */
static struct descrip leica_compress[] = {
        { 2,    "Low" },
        { 3,    "Normal" },
        { 6,    "Very Low" },
        { 7,    "Raw" },
        { -1,   "Unknown" },
};
/* Generic boolean. */
static struct descrip leica_bool[] = {
        { 1,    "On" },
        { 2,    "Off" },
        { -1,   "Unknown" },
};
/* Focus mode. */
static struct descrip leica_focus[] = {
        { 1,    "Auto" },
        { 2,    "Manual" },
        { -1,   "Unknown" },
};
/* Flash exposure compensation. */
static struct descrip leica_flashev[] = {
        { 0,            "0 EV" },
        { 1,            "0.33 EV" },
        { 2,            "0.67 EV" },
        { 3,            "1 EV" },
        { 4,            "1.33 EV" },
        { 5,            "1.67 EV" },
        { 6,            "2 EV" },
        { 0xfffa,       "-2 EV" },
        { 0xfffb,       "-1.67 EV" },
        { 0xfffc,       "-1.33 EV" },
        { 0xfffd,       "-1 EV" },
        { 0xfffe,       "-0.67 EV" },
        { 0xffff,       "-0.33 EV" },
        { -1,           "Unknown" },
};
/* Contrast. */
static struct descrip leica_contrast[] = {
        { 0x100,        "Low" },
        { 0x110,        "Standard" },
        { 0x120,        "High" },
        { -1,           "Unknown" },
};
/* Aperture mode. */
static struct descrip leica_aperture[] = {
        { 6,    "Auto" },
        { 7,    "Manual" },
        { -1,   "Unknown" },
};
/* Spot autofocus. */
static struct descrip leica_spotaf[] = {
        { 256,  "On" },
        { 4096, "Off" },
        { -1,   "Unknown" },
};
/* Maker note IFD tags. */
static struct exiftag leica_tags[] = {
        { 0x0001, TIFF_ASCII, 8, ED_IMG, "LeicaCompress",
          "Compression Rate", leica_compress },
        { 0x0003, TIFF_SHORT, 1, ED_IMG, "LeicaWhiteBal",
          "White Balance", leica_white },
        { 0x0007, TIFF_SHORT, 1, ED_IMG, "LeicaFocusMode",
          "Focus Mode", leica_focus },
        { 0x000f, TIFF_SHORT, 1, ED_IMG, "LeicaSpotAF",
          "Spot Autofocus", leica_spotaf },
        { 0x001c, TIFF_SHORT, 1, ED_IMG, "LeicaMacro",
          "Macro Mode", leica_bool },
        { 0x001f, TIFF_SHORT, 1, ED_IMG, "LeicaAperture",
          "Aperture Mode", leica_aperture },
        { 0x0024, TIFF_SHORT, 1, ED_IMG, "LeicaFlashEV",
          "Flash Compensation", leica_flashev },
        { 0x002c, TIFF_SHORT, 1, ED_IMG, "LeicaContrast",
          "Contrast", leica_contrast },
        { 0xffff, TIFF_UNKN, 0, ED_UNK, "LeicaUnknown",
          "Leica Unknown", NULL },
};
/*
 * Process Leica maker note tags.
 */
void
leica_prop(struct exifprop *prop, struct exiftags *t)
{
        /*
         * Assume that if the property's tag set is not our Leica one,
         * it must be Fuji's.
         */
        if (prop->tagset != leica_tags) {
                fuji_prop(prop, t);
                return;
        }
        /* Override a couple of standard tags. */
        switch (prop->tag) {
        /* White balance. */
        case 0x0003:
                prop->override = EXIF_T_WHITEBAL;
                break;
        /* Contrast. */
        case 0x002c:
                prop->override = EXIF_T_CONTRAST;
                break;
        }
}
/*
 * Try to read a Leica maker note IFD.
 */
struct ifd *
leica_ifd(u_int32_t offset, struct tiffmeta *md)
{
        /*
         * Leica maker notes start with an ID string, followed by an IFD
         * offset relative to the MakerNote tag.
         *
         * The Digilux 4.3 seems to just spit out Fuji maker notes.  So,
         * go ahead and use the Fuji functions...
         */
        if (!strncmp((const char *)(md->btiff + offset), "FUJIFILM", 8))
                return (fuji_ifd(offset, md));
        if (!strncmp((const char *)(md->btiff + offset), "LEICA", 5))
                return (readifds(offset + 8, leica_tags, md));
        return (readifds(offset, leica_tags, md));
}