/*
  Copyright 2017 Larry Gritz et al. All Rights Reserved.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are
  met:
  * Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
  * 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.
  * Neither the name of the software's owners nor the names of its
    contributors may be used to endorse or promote products derived from
    this software without specific prior written permission.
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
  OWNER 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.

  (This is the Modified BSD License)
*/

// clang-format off

// See: https://sno.phy.queensu.ca/~phil/exiftool/TagNames/Canon.html
// 

#include <algorithm>
#include <array>
#include <type_traits>

#include "exif.h"

OIIO_NAMESPACE_BEGIN
namespace pvt {


static LabelIndex canon_macromode_table[] = {
    { 1, "macro" }, { 2, "normal" }, { -1, nullptr }
};

static LabelIndex canon_quality_table[] = {
    { 1, "economy" }, { 2, "normal" }, { 2, "fine" }, { 4, "RAW" },
    { 5, "superfine" }, { 130, "normal movie" }, { 131, "movie(2)" },
    { -1, nullptr }
};

static LabelIndex canon_flashmode_table[] = {
    { 0, "off" }, { 1, "auto" }, { 2, "on" }, { 3, "red-eye reduction" },
    { 4, "slow-sync" }, { 5, "red-eye reduction (auto)" },
    { 6, "red-eye reduction (on)" }, { 16, "external flash" },
    { -1, nullptr }
};

static LabelIndex canon_continuousdrive_table[] = {
    { 0, "single" },
    { 1, "continuous" },
    { 2, "movie" },
    { 3, "continuous, speed priority" },
    { 4, "continuous, low" },
    { 5, "continuous, high" },
    { 6, "silent single" },
    { 9, "single, silent" },
    { 10, "continuous, silent" },
    { -1, nullptr }
};

static LabelIndex canon_focusmode_table[] = {
    { 0, "one-shot AF" }, { 1, "AI servo AF" }, { 2, "AI focus AF" },
    { 3, "manual focus(3)" }, { 4, "single" }, { 5, "continuous" },
    { 6, "manual focus(6)" }, { 16, "pan focus" }, { 256, "AF + MF" },
    { 512, "movie snap focus" }, { 519, "movie servo AF" }, { -1, nullptr }
};

static LabelIndex canon_recordmode_table[] = {
    { 1, "JPEG" }, { 2, "CRW+THM" }, { 3, "AVI+THM" }, { 4, "TIF" },
    { 5, "TIF+JPEG" }, { 6, "CR2" }, { 7, "CR2+JPEG" }, { 9, "MOV" },
    { 10, "MP4" }, { -1, nullptr }
};

static LabelIndex canon_imagesize_table[] = {
    { 0, "large" }, { 1, "medium" }, { 2, "small" }, { 5, "medium 1" },
    { 6, "medium 2" }, { 7, "medium 3" }, { 8, "postcard" },
    { 9, "widescreen" }, { 10, "medium widescreen" }, { 14, "small 1" },
    { 15, "small 2" }, { 16, "small 3" }, { 128, "640x480 movie" },
    { 129, "medium movie" }, { 130, "small movie" }, { 137, "1280x720 movie" },
    { 142, "1920x1080 movie" }, { -1, nullptr }
};

static LabelIndex canon_easymode_table[] = {
    { 0, "Full auto" }, { 1, "Manual" }, { 2, "Landscape" }, { 3, "Fast shutter" },
    { 4, "Slow shutter" }, { 5, "Night" }, { 6, "Gray Scale" }, { 7, "Sepia" },
    { 8, "Portrait" }, { 9, "Sports" }, { 10, "Macro" }, { 11, "Black & White" },
    { 12, "Pan focus" }, { 13, "Vivid" }, { 14, "Neutral" }, { 15, "Flash Off" },
    { 16, "Long Shutter" }, { 17, "Super Macro" }, { 18, "Foliage" },
    { 19, "Indoor" }, { 20, "Fireworks" }, { 21, "Beach" }, { 22, "Underwater" },
    { 23, "Snow" }, { 24, "Kids & Pets" }, { 25, "Night Snapshot" },
    { 26, "Digital Macro" }, { 27, "My Colors" }, { 28, "Movie Snap" },
    { 29, "Super Macro 2" }, { 30, "Color Accent" }, { 31, "Color Swap" },
    { 32, "Aquarium" }, { 33, "ISO 3200" }, { 34, "ISO 6400" },
    { 35, "Creative Light Effect" }, { 36, "Easy" }, { 37, "Quick Shot" },
    { 38, "Creative Auto" }, { 39, "Zoom Blur" }, { 40, "Low Light" },
    { 41, "Nostalgic" }, { 42, "Super Vivid" }, { 43, "Poster Effect" },
    { 44, "Face Self-timer" }, { 45, "Smile" }, { 46, "Wink Self-timer" },
    { 47, "Fisheye Effect" }, { 48, "Miniature Effect" }, { 49, "High-speed Burst" },
    { 50, "Best Image Selection" }, { 51, "High Dynamic Range" },
    { 52, "Handheld Night Scene" }, { 53, "Movie Digest" },
    { 54, "Live View Control" }, { 55, "Discreet" }, { 56, "Blur Reduction" },
    { 57, "Monochrome" }, { 58, "Toy Camera Effect" }, { 59, "Scene Intelligent Auto" },
    { 60, "High-speed Burst HQ" }, { 61, "Smooth Skin" }, { 62, "Soft Focus" },
    { 257, "Spotlight" }, { 258, "Night 2" }, { 259, "Night+" }, { 260, "Super Night" },
    { 261, "Sunset" }, { 263, "Night Scene" }, { 264, "Surface" },
    { 265, "Low Light 2" }, { -1, nullptr }
};

static LabelIndex canon_digitalzoom_table[] = {
    { 0, "none" }, { 1, "2x" }, { 2, "4x" }, { 3, "other" }, { -1, nullptr }
};

static LabelIndex canon_meteringmode_table[] = {
    { 0, "default" }, { 1, "spot" }, { 2, "average" }, { 3, "evaluative" },
    { 4, "partial" }, { 5, "center-weighted average" }, { -1, nullptr }
};

static LabelIndex canon_focusrange_table[] = {
    { 0, "manual" }, { 1, "auto" }, { 2, "not known" }, { 3, "macro" },
    { 4, "very close" }, { 5, "close" }, { 6, "middle range" },
    { 7, "far range" }, { 8, "pan focus" }, { 9, "super macro" },
    { 10, "infinity" }, { -1, nullptr }
};

static LabelIndex canon_afpoint_table[] = {
    { 0x2005, "Manual AF point selection" }, { 0x3000, "None (MF)" },
    { 0x3001, "Auto AF point selection" }, { 0x3002, "Right" },
    { 0x3003, "Center" }, { 0x3004, "Left" },
    { 0x4001, "Auto AF point selection" }, { 0x4006, "Face Detect" },
    { -1, nullptr }
};

static LabelIndex canon_exposuremode_table[] = {
    { 0, "Easy" }, { 1, "Program AE" }, { 2, "Shutter speed priority AE" },
    { 3, "Aperture-priority AE" }, { 4, "Manual" }, { 5, "Depth-of-field AE" },
    { 6, "M-Dep" }, { 7, "Bulb" }, { -1, nullptr }
};

static std::string
explain_canon_flashbits (const ParamValue &p, const void *extradata)
{
    int val = p.get_int();
    if (val == 0)
        return "none";
    std::vector<std::string> bits;
    if (val & (1<<0))  bits.emplace_back ("manual");
    if (val & (1<<1))  bits.emplace_back ("TTL");
    if (val & (1<<2))  bits.emplace_back ("A-TTL");
    if (val & (1<<3))  bits.emplace_back ("E-TTL");
    if (val & (1<<4))  bits.emplace_back ("FP sync enabled");
    if (val & (1<<7))  bits.emplace_back ("2nd-curtain sync used");
    if (val & (1<<11)) bits.emplace_back ("FP sync used");
    if (val & (1<<13)) bits.emplace_back ("built-in");
    if (val & (1<<14)) bits.emplace_back ("external");
    return Strutil::join (bits, ", ");
}

static LabelIndex canon_focuscontinuous_table[] = {
    { 0, "single" }, { 1, "continuous" }, { 8, "manual" }, { -1, nullptr }
};

static LabelIndex canon_aesetting_table[] = {
    { 0, "normal AE" }, { 1, "exposure compensation" }, { 2, "AE lock" },
    { 3, "AE lock + exposure compensation" }, { 4, "no AE" }, { -1, nullptr }
};

static LabelIndex canon_imagestabilization_table[] = {
    { 0, "Off" }, { 1, "On" }, { 2, "Shoot Only" }, { 3, "Panning" },
    { 4, "Dynamic" }, { 256, "Off (2)" }, { 257, "On (2)" },
    { 258, "Shoot Only (2)" }, { 259, "Panning (2)" }, { 260, "Dynamic (2)" },
    { -1, nullptr }
};

static LabelIndex canon_spotmeteringmode_table[] = {
    { 0, "center" }, { 1, "AF point" }, { -1, nullptr }
};

static LabelIndex canon_photoeffect_table[] = {
    { 0, "off" }, { 1, "vivid" }, { 2, "neutral" }, { 3, "smooth" },
    { 4, "sepia" }, { 5, "b&w" }, { 6, "custom" }, { 100, "my color data" },
    { -1, nullptr }
};

static LabelIndex canon_manualflashoutput_table[] = {
    { 0, "n/a" }, { 0x500, "full" }, { 0x502, "medium" }, { 0x504, "low" },
    { 0x7fff, "n/a" }, { -1, nullptr }
};

static LabelIndex canon_srawquality_table[] = {
    { 0, "n/a" }, { 1, "sRAW1 (mRAW)" }, { 2, "sRAW2 (sRAW)" }, { -1, nullptr }
};

static LabelIndex canon_slowshutter_table[] = {
    { 0, "off" }, { 1, "night scene" }, { 2, "on" }, { 3, "none" }, { -1, nullptr }
};

static LabelIndex canon_afpointsinfocus_table[] = {
    { 0x3000, "none" }, { 0x3001, "right" }, { 0x3002, "center" },
    { 0x3003, "center+right" }, { 0x3004, "left" }, { 0x3005, "left+right" },
    { 0x3006, "left+center" }, { 0x3007, "all" }, { -1, nullptr }
};

static LabelIndex canon_autoexposurebracketing_table[] = {
    { -1, "on" }, { 0, "off" }, { 1, "on shot 1" }, { 2, "on shot 2" },
    { 3, "on shot 3" }, { -1, nullptr }
};

static LabelIndex canon_controlmode_table[] = {
    { 0, "n/a" }, { 1, "camera local control" },
    { 3, "computer remote control" }, { -1, nullptr }
};

static LabelIndex canon_cameratype_table[] = {
    { 0, "n/a" }, { 248, "EOS High-end" }, { 250, "Compact" },
    { 252, "EOS Mid-range" }, { 2554, "DV Camera" }, { -1, nullptr }
};

static LabelIndex canon_autorotate_table[] = {
    { -1, "n/a" }, { 0, "none" }, { 1, "rotate 90 CW" },
    { 2, "rotate 180" }, { 3, "rotate 270 CW" }, { -1, nullptr }
};

static LabelIndex canon_ndfilter_table[] = {
    { -1, "n/a" }, { 0, "off" }, { 1, "on" }, { -1, nullptr }
};

static LabelIndex canon_whitebalance_table[] = {
    { 0,  "Auto" }, { 1,  "Daylight" }, { 2,  "Cloudy" }, { 3,  "Tungsten" },
    { 4,  "Fluorescent" }, { 5,  "Flash" }, { 6,  "Custom" }, { 7,  "Black & White" },
    { 8,  "Shade" }, { 9,  "Manual Temperature (Kelvin)" }, { 10, "PC Set1" },
    { 11, "PC Set2" }, { 12, "PC Set3" }, { 14, "Daylight Fluorescent" },
    { 15, "Custom 1" }, { 16, "Custom 2" }, { 17, "Underwater" },
    { 18, "Custom 3" }, { 19, "Custom 4" }, { 20, "PC Set4" }, { 21, "PC Set5" },
    { 23, "Auto (ambience priority)" }, { -1, nullptr }
};

static LabelIndex canon_modelid_table[] = {
    { int(0x1010000), "PowerShot A30" },
    { int(0x1040000), "PowerShot S300 / Digital IXUS 300 / IXY Digital 300" },
    { int(0x1060000), "PowerShot A20" },
    { int(0x1080000), "PowerShot A10" },
    { int(0x1090000), "PowerShot S110 / Digital IXUS v / IXY Digital 200" },
    { int(0x1100000), "PowerShot G2" },
    { int(0x1110000), "PowerShot S40" },
    { int(0x1120000), "PowerShot S30" },
    { int(0x1130000), "PowerShot A40" },
    { int(0x1140000), "EOS D30" },
    { int(0x1150000), "PowerShot A100" },
    { int(0x1160000), "PowerShot S200 / Digital IXUS v2 / IXY Digital 200a" },
    { int(0x1170000), "PowerShot A200" },
    { int(0x1180000), "PowerShot S330 / Digital IXUS 330 / IXY Digital 300a" },
    { int(0x1190000), "PowerShot G3" },
    { int(0x1210000), "PowerShot S45" },
    { int(0x1230000), "PowerShot SD100 / Digital IXUS II / IXY Digital 30" },
    { int(0x1240000), "PowerShot S230 / Digital IXUS v3 / IXY Digital 320" },
    { int(0x1250000), "PowerShot A70" },
    { int(0x1260000), "PowerShot A60" },
    { int(0x1270000), "PowerShot S400 / Digital IXUS 400 / IXY Digital 400" },
    { int(0x1290000), "PowerShot G5" },
    { int(0x1300000), "PowerShot A300" },
    { int(0x1310000), "PowerShot S50" },
    { int(0x1340000), "PowerShot A80" },
    { int(0x1350000), "PowerShot SD10 / Digital IXUS i / IXY Digital L" },
    { int(0x1360000), "PowerShot S1 IS" },
    { int(0x1370000), "PowerShot Pro1" },
    { int(0x1380000), "PowerShot S70" },
    { int(0x1390000), "PowerShot S60" },
    { int(0x1400000), "PowerShot G6" },
    { int(0x1410000), "PowerShot S500 / Digital IXUS 500 / IXY Digital 500" },
    { int(0x1420000), "PowerShot A75" },
    { int(0x1440000), "PowerShot SD110 / Digital IXUS IIs / IXY Digital 30a" },
    { int(0x1450000), "PowerShot A400" },
    { int(0x1470000), "PowerShot A310" },
    { int(0x1490000), "PowerShot A85" },
    { int(0x1520000), "PowerShot S410 / Digital IXUS 430 / IXY Digital 450" },
    { int(0x1530000), "PowerShot A95" },
    { int(0x1540000), "PowerShot SD300 / Digital IXUS 40 / IXY Digital 50" },
    { int(0x1550000), "PowerShot SD200 / Digital IXUS 30 / IXY Digital 40" },
    { int(0x1560000), "PowerShot A520" },
    { int(0x1570000), "PowerShot A510" },
    { int(0x1590000), "PowerShot SD20 / Digital IXUS i5 / IXY Digital L2" },
    { int(0x1640000), "PowerShot S2 IS" },
    { int(0x1650000), "PowerShot SD430 / Digital IXUS Wireless / IXY Digital Wireless" },
    { int(0x1660000), "PowerShot SD500 / Digital IXUS 700 / IXY Digital 600" },
    { int(0x1668000), "EOS D60" },
    { int(0x1700000), "PowerShot SD30 / Digital IXUS i Zoom / IXY Digital L3" },
    { int(0x1740000), "PowerShot A430" },
    { int(0x1750000), "PowerShot A410" },
    { int(0x1760000), "PowerShot S80" },
    { int(0x1780000), "PowerShot A620" },
    { int(0x1790000), "PowerShot A610" },
    { int(0x1800000), "PowerShot SD630 / Digital IXUS 65 / IXY Digital 80" },
    { int(0x1810000), "PowerShot SD450 / Digital IXUS 55 / IXY Digital 60" },
    { int(0x1820000), "PowerShot TX1" },
    { int(0x1870000), "PowerShot SD400 / Digital IXUS 50 / IXY Digital 55" },
    { int(0x1880000), "PowerShot A420" },
    { int(0x1890000), "PowerShot SD900 / Digital IXUS 900 Ti / IXY Digital 1000" },
    { int(0x1900000), "PowerShot SD550 / Digital IXUS 750 / IXY Digital 700" },
    { int(0x1920000), "PowerShot A700" },
    { int(0x1940000), "PowerShot SD700 IS / Digital IXUS 800 IS / IXY Digital 800 IS" },
    { int(0x1950000), "PowerShot S3 IS" },
    { int(0x1960000), "PowerShot A540" },
    { int(0x1970000), "PowerShot SD600 / Digital IXUS 60 / IXY Digital 70" },
    { int(0x1980000), "PowerShot G7" },
    { int(0x1990000), "PowerShot A530" },
    { int(0x2000000), "PowerShot SD800 IS / Digital IXUS 850 IS / IXY Digital 900 IS" },
    { int(0x2010000), "PowerShot SD40 / Digital IXUS i7 / IXY Digital L4" },
    { int(0x2020000), "PowerShot A710 IS" },
    { int(0x2030000), "PowerShot A640" },
    { int(0x2040000), "PowerShot A630" },
    { int(0x2090000), "PowerShot S5 IS" },
    { int(0x2100000), "PowerShot A460" },
    { int(0x2120000), "PowerShot SD850 IS / Digital IXUS 950 IS / IXY Digital 810 IS" },
    { int(0x2130000), "PowerShot A570 IS" },
    { int(0x2140000), "PowerShot A560" },
    { int(0x2150000), "PowerShot SD750 / Digital IXUS 75 / IXY Digital 90" },
    { int(0x2160000), "PowerShot SD1000 / Digital IXUS 70 / IXY Digital 10" },
    { int(0x2180000), "PowerShot A550" },
    { int(0x2190000), "PowerShot A450" },
    { int(0x2230000), "PowerShot G9" },
    { int(0x2240000), "PowerShot A650 IS" },
    { int(0x2260000), "PowerShot A720 IS" },
    { int(0x2290000), "PowerShot SX100 IS" },
    { int(0x2300000), "PowerShot SD950 IS / Digital IXUS 960 IS / IXY Digital 2000 IS" },
    { int(0x2310000), "PowerShot SD870 IS / Digital IXUS 860 IS / IXY Digital 910 IS" },
    { int(0x2320000), "PowerShot SD890 IS / Digital IXUS 970 IS / IXY Digital 820 IS" },
    { int(0x2360000), "PowerShot SD790 IS / Digital IXUS 90 IS / IXY Digital 95 IS" },
    { int(0x2370000), "PowerShot SD770 IS / Digital IXUS 85 IS / IXY Digital 25 IS" },
    { int(0x2380000), "PowerShot A590 IS" },
    { int(0x2390000), "PowerShot A580" },
    { int(0x2420000), "PowerShot A470" },
    { int(0x2430000), "PowerShot SD1100 IS / Digital IXUS 80 IS / IXY Digital 20 IS" },
    { int(0x2460000), "PowerShot SX1 IS" },
    { int(0x2470000), "PowerShot SX10 IS" },
    { int(0x2480000), "PowerShot A1000 IS" },
    { int(0x2490000), "PowerShot G10" },
    { int(0x2510000), "PowerShot A2000 IS" },
    { int(0x2520000), "PowerShot SX110 IS" },
    { int(0x2530000), "PowerShot SD990 IS / Digital IXUS 980 IS / IXY Digital 3000 IS" },
    { int(0x2540000), "PowerShot SD880 IS / Digital IXUS 870 IS / IXY Digital 920 IS" },
    { int(0x2550000), "PowerShot E1" },
    { int(0x2560000), "PowerShot D10" },
    { int(0x2570000), "PowerShot SD960 IS / Digital IXUS 110 IS / IXY Digital 510 IS" },
    { int(0x2580000), "PowerShot A2100 IS" },
    { int(0x2590000), "PowerShot A480" },
    { int(0x2600000), "PowerShot SX200 IS" },
    { int(0x2610000), "PowerShot SD970 IS / Digital IXUS 990 IS / IXY Digital 830 IS" },
    { int(0x2620000), "PowerShot SD780 IS / Digital IXUS 100 IS / IXY Digital 210 IS" },
    { int(0x2630000), "PowerShot A1100 IS" },
    { int(0x2640000), "PowerShot SD1200 IS / Digital IXUS 95 IS / IXY Digital 110 IS" },
    { int(0x2700000), "PowerShot G11" },
    { int(0x2710000), "PowerShot SX120 IS" },
    { int(0x2720000), "PowerShot S90" },
    { int(0x2750000), "PowerShot SX20 IS" },
    { int(0x2760000), "PowerShot SD980 IS / Digital IXUS 200 IS / IXY Digital 930 IS" },
    { int(0x2770000), "PowerShot SD940 IS / Digital IXUS 120 IS / IXY Digital 220 IS" },
    { int(0x2800000), "PowerShot A495" },
    { int(0x2810000), "PowerShot A490" },
    { int(0x2820000), "PowerShot A3100/A3150 IS" },
    { int(0x2830000), "PowerShot A3000 IS" },
    { int(0x2840000), "PowerShot SD1400 IS / IXUS 130 / IXY 400F" },
    { int(0x2850000), "PowerShot SD1300 IS / IXUS 105 / IXY 200F" },
    { int(0x2860000), "PowerShot SD3500 IS / IXUS 210 / IXY 10S" },
    { int(0x2870000), "PowerShot SX210 IS" },
    { int(0x2880000), "PowerShot SD4000 IS / IXUS 300 HS / IXY 30S" },
    { int(0x2890000), "PowerShot SD4500 IS / IXUS 1000 HS / IXY 50S" },
    { int(0x2920000), "PowerShot G12" },
    { int(0x2930000), "PowerShot SX30 IS" },
    { int(0x2940000), "PowerShot SX130 IS" },
    { int(0x2950000), "PowerShot S95" },
    { int(0x2980000), "PowerShot A3300 IS" },
    { int(0x2990000), "PowerShot A3200 IS" },
    { int(0x3000000), "PowerShot ELPH 500 HS / IXUS 310 HS / IXY 31S" },
    { int(0x3010000), "PowerShot Pro90 IS" },
    { int(0x3010001), "PowerShot A800" },
    { int(0x3020000), "PowerShot ELPH 100 HS / IXUS 115 HS / IXY 210F" },
    { int(0x3030000), "PowerShot SX230 HS" },
    { int(0x3040000), "PowerShot ELPH 300 HS / IXUS 220 HS / IXY 410F" },
    { int(0x3050000), "PowerShot A2200" },
    { int(0x3060000), "PowerShot A1200" },
    { int(0x3070000), "PowerShot SX220 HS" },
    { int(0x3080000), "PowerShot G1 X" },
    { int(0x3090000), "PowerShot SX150 IS" },
    { int(0x3100000), "PowerShot ELPH 510 HS / IXUS 1100 HS / IXY 51S" },
    { int(0x3110000), "PowerShot S100 (new)" },
    { int(0x3120000), "PowerShot ELPH 310 HS / IXUS 230 HS / IXY 600F" },
    { int(0x3130000), "PowerShot SX40 HS" },
    { int(0x3140000), "IXY 32S" },
    { int(0x3160000), "PowerShot A1300" },
    { int(0x3170000), "PowerShot A810" },
    { int(0x3180000), "PowerShot ELPH 320 HS / IXUS 240 HS / IXY 420F" },
    { int(0x3190000), "PowerShot ELPH 110 HS / IXUS 125 HS / IXY 220F" },
    { int(0x3200000), "PowerShot D20" },
    { int(0x3210000), "PowerShot A4000 IS" },
    { int(0x3220000), "PowerShot SX260 HS" },
    { int(0x3230000), "PowerShot SX240 HS" },
    { int(0x3240000), "PowerShot ELPH 530 HS / IXUS 510 HS / IXY 1" },
    { int(0x3250000), "PowerShot ELPH 520 HS / IXUS 500 HS / IXY 3" },
    { int(0x3260000), "PowerShot A3400 IS" },
    { int(0x3270000), "PowerShot A2400 IS" },
    { int(0x3280000), "PowerShot A2300" },
    { int(0x3330000), "PowerShot G15" },
    { int(0x3340000), "PowerShot SX50 HS" },
    { int(0x3350000), "PowerShot SX160 IS" },
    { int(0x3360000), "PowerShot S110 (new)" },
    { int(0x3370000), "PowerShot SX500 IS" },
    { int(0x3380000), "PowerShot N" },
    { int(0x3390000), "IXUS 245 HS / IXY 430F" },
    { int(0x3400000), "PowerShot SX280 HS" },
    { int(0x3410000), "PowerShot SX270 HS" },
    { int(0x3420000), "PowerShot A3500 IS" },
    { int(0x3430000), "PowerShot A2600" },
    { int(0x3440000), "PowerShot SX275 HS" },
    { int(0x3450000), "PowerShot A1400" },
    { int(0x3460000), "PowerShot ELPH 130 IS / IXUS 140 / IXY 110F" },
    { int(0x3470000), "PowerShot ELPH 115/120 IS / IXUS 132/135 / IXY 90F/100F" },
    { int(0x3490000), "PowerShot ELPH 330 HS / IXUS 255 HS / IXY 610F" },
    { int(0x3510000), "PowerShot A2500" },
    { int(0x3540000), "PowerShot G16" },
    { int(0x3550000), "PowerShot S120" },
    { int(0x3560000), "PowerShot SX170 IS" },
    { int(0x3580000), "PowerShot SX510 HS" },
    { int(0x3590000), "PowerShot S200 (new)" },
    { int(0x3600000), "IXY 620F" },
    { int(0x3610000), "PowerShot N100" },
    { int(0x3640000), "PowerShot G1 X Mark II" },
    { int(0x3650000), "PowerShot D30" },
    { int(0x3660000), "PowerShot SX700 HS" },
    { int(0x3670000), "PowerShot SX600 HS" },
    { int(0x3680000), "PowerShot ELPH 140 IS / IXUS 150 / IXY 130" },
    { int(0x3690000), "PowerShot ELPH 135 / IXUS 145 / IXY 120" },
    { int(0x3700000), "PowerShot ELPH 340 HS / IXUS 265 HS / IXY 630" },
    { int(0x3710000), "PowerShot ELPH 150 IS / IXUS 155 / IXY 140" },
    { int(0x3740000), "EOS M3" },
    { int(0x3750000), "PowerShot SX60 HS" },
    { int(0x3760000), "PowerShot SX520 HS" },
    { int(0x3770000), "PowerShot SX400 IS" },
    { int(0x3780000), "PowerShot G7 X" },
    { int(0x3790000), "PowerShot N2" },
    { int(0x3800000), "PowerShot SX530 HS" },
    { int(0x3820000), "PowerShot SX710 HS" },
    { int(0x3830000), "PowerShot SX610 HS" },
    { int(0x3840000), "EOS M10" },
    { int(0x3850000), "PowerShot G3 X" },
    { int(0x3860000), "PowerShot ELPH 165 HS / IXUS 165 / IXY 160" },
    { int(0x3870000), "PowerShot ELPH 160 / IXUS 160" },
    { int(0x3880000), "PowerShot ELPH 350 HS / IXUS 275 HS / IXY 640" },
    { int(0x3890000), "PowerShot ELPH 170 IS / IXUS 170" },
    { int(0x3910000), "PowerShot SX410 IS" },
    { int(0x3930000), "PowerShot G9 X" },
    { int(0x3940000), "EOS M5" },
    { int(0x3950000), "PowerShot G5 X" },
    { int(0x3970000), "PowerShot G7 X Mark II" },
    { int(0x3990000), "PowerShot ELPH 360 HS / IXUS 285 HS / IXY 650" },
    { int(0x4010000), "PowerShot SX540 HS" },
    { int(0x4020000), "PowerShot SX420 IS" },
    { int(0x4030000), "PowerShot ELPH 190 IS / IXUS 180 / IXY 190" },
    { int(0x4040000), "PowerShot G1" },
    { int(0x4040001), "IXY 180" },
    { int(0x4050000), "PowerShot SX720 HS" },
    { int(0x4060000), "PowerShot SX620 HS" },
    { int(0x4070000), "EOS M6" },
    { int(0x4100000), "PowerShot G9 X Mark II" },
    { int(0x4150000), "PowerShot ELPH 185 / IXUS 185 / IXY 200" },
    { int(0x4160000), "PowerShot SX430 IS" },
    { int(0x4170000), "PowerShot SX730 HS" },
    { int(0x6040000), "PowerShot S100 / Digital IXUS / IXY Digital" },
    { int(0x4007d673), "C19/DC21/DC22" },
    { int(0x4007d674), "H A1" },
    { int(0x4007d675), "V10" },
    { int(0x4007d676), "D130/MD140/MD150/MD160/ZR850" },
    { int(0x4007d777), "C50" },
    { int(0x4007d778), "V20" },
    { int(0x4007d779), "C211" },
    { int(0x4007d77a), "G10" },
    { int(0x4007d77b), "R10" },
    { int(0x4007d77d), "D255/ZR950" },
    { int(0x4007d81c), "F11" },
    { int(0x4007d878), "V30" },
    { int(0x4007d87c), "H A1S" },
    { int(0x4007d87e), "C301/DC310/DC311/DC320/DC330" },
    { int(0x4007d87f), "S100" },
    { int(0x4007d880), "F10" },
    { int(0x4007d882), "G20/HG21" },
    { int(0x4007d925), "F21" },
    { int(0x4007d926), "F S11" },
    { int(0x4007d978), "V40" },
    { int(0x4007d987), "C410/DC411/DC420" },
    { int(0x4007d988), "S19/FS20/FS21/FS22/FS200" },
    { int(0x4007d989), "F20/HF200" },
    { int(0x4007d98a), "F S10/S100" },
    { int(0x4007da8e), "F R10/R16/R17/R18/R100/R106" },
    { int(0x4007da8f), "F M30/M31/M36/M300/M306" },
    { int(0x4007da90), "F S20/S21/S200" },
    { int(0x4007da92), "S31/FS36/FS37/FS300/FS305/FS306/FS307" },
    { int(0x4007dda9), "F G25" },
    { int(0x4007dfb4), "C10" },
    { int(0x80000001), "OS-1D" },
    { int(0x80000167), "OS-1DS" },
    { int(0x80000168), "OS 10D" },
    { int(0x80000169), "OS-1D Mark III" },
    { int(0x80000170), "OS Digital Rebel / 300D / Kiss Digital" },
    { int(0x80000174), "OS-1D Mark II" },
    { int(0x80000175), "OS 20D" },
    { int(0x80000176), "OS Digital Rebel XSi / 450D / Kiss X2" },
    { int(0x80000188), "OS-1Ds Mark II" },
    { int(0x80000189), "OS Digital Rebel XT / 350D / Kiss Digital N" },
    { int(0x80000190), "OS 40D" },
    { int(0x80000213), "OS 5D" },
    { int(0x80000215), "OS-1Ds Mark III" },
    { int(0x80000218), "OS 5D Mark II" },
    { int(0x80000219), "FT-E1" },
    { int(0x80000232), "OS-1D Mark II N" },
    { int(0x80000234), "OS 30D" },
    { int(0x80000236), "OS Digital Rebel XTi / 400D / Kiss Digital X" },
    { int(0x80000241), "FT-E2" },
    { int(0x80000246), "FT-E3" },
    { int(0x80000250), "OS 7D" },
    { int(0x80000252), "OS Rebel T1i / 500D / Kiss X3" },
    { int(0x80000254), "OS Rebel XS / 1000D / Kiss F" },
    { int(0x80000261), "OS 50D" },
    { int(0x80000269), "OS-1D X" },
    { int(0x80000270), "OS Rebel T2i / 550D / Kiss X4" },
    { int(0x80000271), "FT-E4" },
    { int(0x80000273), "FT-E5" },
    { int(0x80000281), "OS-1D Mark IV" },
    { int(0x80000285), "OS 5D Mark III" },
    { int(0x80000286), "OS Rebel T3i / 600D / Kiss X5" },
    { int(0x80000287), "OS 60D" },
    { int(0x80000288), "OS Rebel T3 / 1100D / Kiss X50" },
    { int(0x80000289), "OS 7D Mark II" },
    { int(0x80000297), "FT-E2 II" },
    { int(0x80000298), "FT-E4 II" },
    { int(0x80000301), "OS Rebel T4i / 650D / Kiss X6i" },
    { int(0x80000302), "OS 6D" },
    { int(0x80000324), "OS-1D C" },
    { int(0x80000325), "OS 70D" },
    { int(0x80000326), "OS Rebel T5i / 700D / Kiss X7i" },
    { int(0x80000327), "OS Rebel T5 / 1200D / Kiss X70" },
    { int(0x80000328), "OS-1D X MARK II" },
    { int(0x80000331), "OS M" },
    { int(0x80000346), "OS Rebel SL1 / 100D / Kiss X7" },
    { int(0x80000347), "OS Rebel T6s / 760D / 8000D" },
    { int(0x80000349), "OS 5D Mark IV" },
    { int(0x80000350), "OS 80D" },
    { int(0x80000355), "OS M2" },
    { int(0x80000382), "OS 5DS" },
    { int(0x80000393), "OS Rebel T6i / 750D / Kiss X8i" },
    { int(0x80000401), "OS 5DS R" },
    { int(0x80000404), "OS Rebel T6 / 1300D / Kiss X80" },
    { int(0x80000405), "OS Rebel T7i / 800D / Kiss X9i" },
    { int(0x80000406), "OS 6D Mark II" },
    { int(0x80000408), "OS 77D / 9000D" },
    { int(0x80000417), "OS Rebel SL2 / 200D / Kiss X9" },
    { -1, nullptr }
};

#if 0
static LabelIndex canon_xxx_table[] = {
    { 0, "" },
    { 1, "" },
    { 2, "" },
    { 3, "" },
    { 4, "" },
    { 5, "" },
    { 6, "" },
    { 7, "" },
    { 8, "" },
    { 9, "" },
    { 10, "" },
    { 11, "" },
    { 12, "" },
    { -1, nullptr }
};
#endif


static const ExplanationTableEntry canon_explanations[] = {
    { "Canon:MacroMode", explain_labeltable, canon_macromode_table },
    { "Canon:Quality", explain_labeltable, canon_quality_table },
    { "Canon:FlashMode", explain_labeltable, canon_flashmode_table },
    { "Canon:ContinuousDrive", explain_labeltable, canon_continuousdrive_table },
    { "Canon:FocusMode", explain_labeltable, canon_focusmode_table },
    { "Canon:RecordMode", explain_labeltable, canon_recordmode_table },
    { "Canon:ImageSize", explain_labeltable, canon_imagesize_table },
    { "Canon:EasyMode", explain_labeltable, canon_easymode_table },
    { "Canon:DigitalZoom", explain_labeltable, canon_digitalzoom_table },
    { "Canon:MeteringMode", explain_labeltable, canon_meteringmode_table },
    { "Canon:FocusRange", explain_labeltable, canon_focusrange_table },
    { "Canon:AFPoint", explain_labeltable, canon_afpoint_table },
    { "Canon:ExposureMode", explain_labeltable, canon_exposuremode_table },
    { "Canon:FlashBits", explain_canon_flashbits, nullptr },
    { "Canon:FocusContinuous", explain_labeltable, canon_focuscontinuous_table },
    { "Canon:AESetting", explain_labeltable, canon_aesetting_table },
    { "Canon:ImageStabilization", explain_labeltable, canon_imagestabilization_table },
    { "Canon:SpotMeteringMode", explain_labeltable, canon_spotmeteringmode_table },
    { "Canon:PhotoEffect", explain_labeltable, canon_photoeffect_table },
    { "Canon:ManualFlashOutput", explain_labeltable, canon_manualflashoutput_table },
    { "Canon:SRAWQuality", explain_labeltable, canon_srawquality_table },
    { "Canon:SlowShutter", explain_labeltable, canon_slowshutter_table },
    { "Canon:AFPointsInFocus", explain_labeltable, canon_afpointsinfocus_table },
    { "Canon:AutoExposureBracketing", explain_labeltable, canon_autoexposurebracketing_table },
    { "Canon:ControlMode", explain_labeltable, canon_controlmode_table },
    { "Canon:CameraType", explain_labeltable, canon_cameratype_table },
    { "Canon:AutoRotate", explain_labeltable, canon_autorotate_table },
    { "Canon:NDFilter", explain_labeltable, canon_ndfilter_table },
    { "Canon:WhiteBalance", explain_labeltable, canon_whitebalance_table },
    { "Canon:ModelID", explain_labeltable, canon_modelid_table },
    // { "Canon:", explain_labeltable, canon__table },
};



cspan<ExplanationTableEntry>
canon_explanation_table ()
{
    return cspan<ExplanationTableEntry>(canon_explanations);
}


/////////////////////////////////////////////////////////////////////////



// Put a whole bunch of sub-indexed data into the spec.
template<typename T>
inline void
array_to_spec (ImageSpec& spec,                 // spec to put attribs into
               const TIFFDirEntry& dir,         // TIFF dir entry
               cspan<uint8_t> buf,              // raw buffer blob
               cspan<LabelIndex> indices,       // LabelIndex table
               int offset_adjustment,
               int na_value = std::numeric_limits<int>::max())
{
    // Make sure it's the right tag type. Be tolerant of signed/unsigned
    // mistakes.
    if (std::is_same<T,int16_t>::value || std::is_same<T,uint16_t>::value) {
        if ((dir.tdir_type != TIFF_SHORT && dir.tdir_type != TIFF_SSHORT))
            return;
    } else if (std::is_same<T,int32_t>::value || std::is_same<T,uint32_t>::value) {
        if ((dir.tdir_type != TIFF_LONG && dir.tdir_type != TIFF_SLONG))
            return;
    }
    else {
        ASSERT(0 && "unsupported type");
    }
    const T *s = (const T *) pvt::dataptr (dir, buf, offset_adjustment);
    for (auto&& attr : indices) {
        if (attr.value < int(dir.tdir_count)) {
            T ival = int (s[attr.value]);
            if (ival != na_value)
                spec.attribute (attr.label, ival);
        }
    }
}


static LabelIndex canon_camerasettings_indices[] = {
    { 1, "Canon:MacroMode" },
    { 2, "Canon:SelfTimer" },
    { 3, "Canon:Quality" },
    { 4, "Canon:FlashMode" },
    { 5, "Canon:ContinuousDrive" },
    { 7, "Canon:FocusMode" },
    { 9, "Canon:RecordMode" },
    { 10, "Canon:ImageSize" },
    { 11, "Canon:EasyMode" },
    { 12, "Canon:DigitalZoom" },
    { 13, "Canon:Contrast" },
    { 14, "Canon:Saturation" },
    { 15, "Canon:Sharpness" },
    { 16, "Canon:CameraISO" },
    { 17, "Canon:MeteringMode" },
    { 18, "Canon:FocusRange" },
    { 19, "Canon:AFPoint" },
    { 20, "Canon:ExposureMode" },
    { 22, "Canon:LensType" },
    { 23, "Canon:MaxFocalLength" },
    { 24, "Canon:MinFocalLength" },
    { 25, "Canon:FocalUnits" },
    { 26, "Canon:MaxAperture" },
    { 27, "Canon:MinAperture" },
    { 28, "Canon:FlashActivity" },
    { 29, "Canon:FlashBits" },
    { 32, "Canon:FocusContinuous" },
    { 33, "Canon:AESetting" },
    { 34, "Canon:ImageStabilization" },
    { 35, "Canon:DisplayAperture" },
    { 36, "Canon:ZoomSourceWidth" },
    { 37, "Canon:ZoomTargetWidth" },
    { 39, "Canon:SpotMeteringMode" },
    { 40, "Canon:PhotoEffect" },
    { 41, "Canon:ManualFlashOutput" },
    { 42, "Canon:ColorTone" },
    { 46, "Canon:SRAWQuality" }
};

static void
canon_camerasettings_handler (const TagInfo& taginfo, const TIFFDirEntry& dir,
                              cspan<uint8_t> buf, ImageSpec& spec,
                              bool swapendian, int offset_adjustment)
{
    array_to_spec<int16_t> (spec, dir, buf, canon_camerasettings_indices,
                            offset_adjustment, -1);
}


static LabelIndex canon_focallength_indices[] = {
    { 0, "Canon:FocalType" },
    { 1, "Canon:FocalLength" },
    { 2, "Canon:FocalPlaneXSize" },
    { 3, "Canon:FocalPlaneYSize" }
};


static void
canon_focallength_handler (const TagInfo& taginfo, const TIFFDirEntry& dir,
                           cspan<uint8_t> buf, ImageSpec& spec,
                           bool swapendian, int offset_adjustment)
{
    array_to_spec<uint16_t> (spec, dir, buf, canon_focallength_indices, offset_adjustment);
}


static LabelIndex canon_shotinfo_indices[] = {
    { 1, "Canon:AutoISO" },
    { 2, "Canon:BaseISO" },
    { 3, "Canon:MeasuredEV" },
    { 4, "Canon:TargetAperture" },
    { 5, "Canon:TargetExposureTime" },
    { 6, "Canon:ExposureCompensation" },
    { 7, "Canon:WhiteBalance" },
    { 8, "Canon:SlowShutter" },
    { 9, "Canon:SequenceNumber" },
    { 10, "Canon:OpticalZoomCode" },
    { 12, "Canon:CameraTemperature" },
    { 13, "Canon:FlashGuideNumber" },
    { 14, "Canon:AFPointsInFocus" },
    { 15, "Canon:ExposureComp" },
    { 16, "Canon:FlashExposureComp" },
    { 17, "Canon:AutoExposureBracketing" },
    { 18, "Canon:AEBBracketValue" },
    { 19, "Canon:ControlMode" },
    { 20, "Canon:FocusDistanceUpper" },
    { 21, "Canon:FocusDistanceLower" },
    { 22, "Canon:FNumber" },
    { 23, "Canon:ExposureTime" },
    { 24, "Canon:MeasuredEV2" },
    { 25, "Canon:BulbDuration" },
    { 26, "Canon:CameraType" },
    { 27, "Canon:AutoRotate" },
    { 28, "Canon:NDFilter" },
    { 29, "Canon:SelfTimer2" },
    { 33, "Canon:FlashOutput" },
};

static void
canon_shotinfo_handler (const TagInfo& taginfo, const TIFFDirEntry& dir,
                        cspan<uint8_t> buf, ImageSpec& spec,
                        bool swapendian, int offset_adjustment)
{
    array_to_spec<int16_t> (spec, dir, buf, canon_shotinfo_indices, offset_adjustment);
}


static LabelIndex canon_panorama_indices[] = {
    { 2, "Canon:PanoramaFrameNumber" },
    { 5, "Canon:PanoramaDirection" },
};

static void
canon_panorama_handler (const TagInfo& taginfo, const TIFFDirEntry& dir,
                        cspan<uint8_t> buf, ImageSpec& spec,
                        bool swapendian, int offset_adjustment)
{
    array_to_spec<int16_t> (spec, dir, buf, canon_panorama_indices, offset_adjustment);
}

static LabelIndex canon_sensorinfo_indices[] = {
    { 1, "Canon:SensorWidth" },
    { 2, "Canon:SensorHeight" },
    { 5, "Canon:SensorLeftBorder" },
    { 6, "Canon:SensorTopBorder" },
    { 7, "Canon:SensorRightBorder" },
    { 8, "Canon:SensorBottomBorder" },
    { 9, "Canon:BlackMaskLeftBorder" },
    { 10, "Canon:BlackMaskTopBorder" },
    { 11, "Canon:BlackMaskRightBorder" },
    { 12, "Canon:BlackMaskBottomBorder" },
};

static void
canon_sensorinfo_handler (const TagInfo& taginfo, const TIFFDirEntry& dir,
                          cspan<uint8_t> buf, ImageSpec& spec,
                          bool swapendian, int offset_adjustment)
{
    array_to_spec<uint16_t> (spec, dir, buf, canon_sensorinfo_indices, offset_adjustment);
}



enum CANON_TAGS {
    CANON_CAMERASETTINGS    = 0X0001,
    CANON_FOCALLENGTH       = 0X0002,
    CANON_FLASHINFO         = 0X0003,
    CANON_SHOTINFO          = 0X0004,
    CANON_PANORAMA          = 0X0005,
    CANON_IMAGETYPE         = 0X0006,
    CANON_FIRMWAREVERSION   = 0X0007,
    CANON_FILENUMBER        = 0X0008,
    CANON_OWNERNAME         = 0X0009,
    CANON_SERIALNUMBER      = 0X000C,
    CANON_CAMERAINFO        = 0X000D,
    CANON_FILELENGTH        = 0X000E,
    CANON_CUSTOMFUNCTIONS   = 0X000F,
    CANON_MODELID           = 0X0010,
    CANON_MOVIEINFO         = 0X0011,
    CANON_AFINFO            = 0X0012,
    CANON_THUMBNAILIMAGEVALIDAREA = 0X0013,
    CANON_SERIALNUMBERFORMAT = 0X0015,
    CANON_SUPERMACRO        = 0X001A,
    CANON_DATESTAMPMODE     = 0X001C,
    CANON_MYCOLORS          = 0X001D,
    CANON_FIRMWAREREVISION  = 0X001E,
    CANON_CATEGORIES        = 0X0023,
    CANON_FACEDETECT1       = 0X0024,
    CANON_FACEDETECT2       = 0X0025,
    CANON_AFINFO2           = 0X0026,
    CANON_CONTRASTINFO      = 0X0027,
    CANON_IMAGEUNIQUEID     = 0X0028,
    CANON_FACEDETECT3       = 0X002F,
    CANON_TIMEINFO          = 0X0035,
    CANON_AFINFO3           = 0X003C,
    CANON_ORIGINALDECISIONDATAOFFSET = 0X0083,
    CANON_CUSTOMFUNCTIONS1D = 0X0090,
    CANON_PERSONALFUNCTIONS = 0X0091,
    CANON_PERSONALFUNCTIONVALUES    = 0X0092,
    CANON_FILEINFO          = 0X0093,
    CANON_AFPOINTSINFOCUS1D = 0X0094,
    CANON_LENSMODEL         = 0X0095,
    CANON_SERIALINFO        = 0X0096,
    CANON_DUSTREMOVALDATA   = 0X0097,
    CANON_CROPINFO          = 0X0098,
    CANON_CUSTOMFUNCTIONS2  = 0X0099,
    CANON_ASPECTINFO        = 0X009A,
    CANON_PROCESSINGINFO    = 0X00a0,
    CANON_TONECURVETABLE    = 0X00A1,
    CANON_SHARPNESSTABLE    = 0X00A2,
    CANON_SHARPNESSFREQTABLE = 0X00A3,
    CANON_WHITEBALANCETABLE = 0X00A4,
    CANON_COLORBALANCE      = 0X00A9,
    CANON_MEASUREDCOLOR     = 0X00AA,
    CANON_COLORTEMPERATURE  = 0X00AE,
    CANON_CANONFLAGS        = 0X00B0,
    CANON_MODIFIEDINFO      = 0X00B1,
    CANON_TONECURVEMATCHING = 0X00B2,
    CANON_WHITEBALANCEMATCHING  = 0X00B3,
    CANON_COLORSPACE        = 0X00B4,
    CANON_PREVIEWIMAGEINFO  = 0X00B6,
    CANON_VRDOFFSET         = 0X00D0,
    CANON_SENSORINFO        = 0X00E0,
    CANON_COLORDATA         = 0X4001,
    CANON_CRWPARAM          = 0X4002,
    CANON_FLAVOR            = 0X4005,
    CANON_PICTURESTYLEUSERDEF = 0X4008,
    CANON_PICTURESTYLEPC    = 0X4009,
    CANON_CUSTOMPICTURESTYLEFILENAME = 0X4010,
    CANON_AFMICROADJ        = 0X4013,
    CANON_VIGNETTINGCORR    = 0X4015,
    CANON_VIGNETTINGCORR2   = 0X4016,
    CANON_LIGHTINGOPT       = 0X4018,
    CANON_LENSINFO          = 0X4019,
    CANON_AMBIENCEINFO      = 0X4020,
    CANON_MULTIEXP          = 0X4021,
    CANON_FILTERINFO        = 0X4024,
    CANON_HDRINFO           = 0X4025,
    CANON_AFCONFIG          = 0X4028
};



static const TagInfo canon_maker_tag_table[] = {
    { CANON_CAMERASETTINGS, "Canon:CameraSettings",  TIFF_SHORT, 0, canon_camerasettings_handler },
    { CANON_FOCALLENGTH, "Canon:FocalLength",  TIFF_SHORT, 0, canon_focallength_handler },
    // { CANON_FLASHINFO, "Canon:FlashInfo", unknown }
    { CANON_SHOTINFO, "Canon:ShotInfo",  TIFF_SHORT, 0, canon_shotinfo_handler },
    { CANON_PANORAMA, "Canon:Panorama",  TIFF_SHORT, 0, canon_panorama_handler },
    { CANON_IMAGETYPE, "Canon:ImageType",       TIFF_ASCII, 0 },
    { CANON_FIRMWAREVERSION, "Canon:FirmwareVersion", TIFF_ASCII, 1 },
    { CANON_FILENUMBER, "Canon:FileNumber",      TIFF_LONG,  1 },
    { CANON_OWNERNAME, "Canon:OwnerName",       TIFF_ASCII, 0 },
    // { 0x000a, unknown }
    { CANON_SERIALNUMBER, "Canon:SerialNumber",    TIFF_LONG,  1 },
    // { CANON_CAMERAINFO, "Canon:CameraInfo",    TIFF_LONG,  0, canon_blah_handler },
    // { CANON_FILELENGTH, "Canon:FileLength",    TIFF_LONG,  1 },
    // { CANON_CUSTOMFUNCTIONS, "Canon:CustomFunctions",    TIFF_LONG,  0, canon_blah_handler },
    { CANON_MODELID, "Canon:ModelID",    TIFF_LONG,  1 },
    // { CANON_MOVIEINFO, "Canon:MovieInfo",    TIFF_LONG,  0, canon_blah_handler },
    // { CANON_AFINFO, "Canon:AFInfo",    TIFF_LONG,  0, canon_blah_handler },
    { CANON_THUMBNAILIMAGEVALIDAREA, "Canon:ThumbnailImageValidArea", TIFF_LONG, 4 },
    { CANON_SERIALNUMBERFORMAT, "Canon:SerialNumberFormat", TIFF_LONG, 1 },
    { CANON_SUPERMACRO, "Canon:SuperMacro", TIFF_SHORT, 1 },
    { CANON_DATESTAMPMODE, "Canon:DateStampMode", TIFF_SHORT, 1 },
    // { CANON_MYCOLORS, "Canon:MyColors",    TIFF_NOTYPE,  0, canon_blah_handler },
    { CANON_FIRMWAREREVISION, "Canon:FirmwareRevision", TIFF_LONG, 1 },
    { CANON_CATEGORIES, "Canon:Categories", TIFF_LONG, 2 },
    // { CANON_FACEDETECT1, "Canon:FaceDetect1",    TIFF_NOTYPE,  0, canon_blah_handler },
    // { CANON_FACEDETECT2, "Canon:FaceDetect2",    TIFF_NOTYPE,  0, canon_blah_handler },
    // { CANON_AFINFO2, "Canon:AFInfo2",    TIFF_NOTYPE,  0, canon_blah_handler },
    // { CANON_CONTRASTINFO, "Canon:ContrastInfo",    TIFF_NOTYPE,  0, canon_blah_handler },
    { CANON_IMAGEUNIQUEID, "Canon:ImageUniqueID",    TIFF_BYTE,  1 },
    // { CANON_FACEDETECT3, "Canon:FaceDetect3",    TIFF_NOTYPE,  0, canon_blah_handler },
    // { CANON_TIMEINFO, "Canon:TimeInfo",    TIFF_NOTYPE,  0, canon_blah_handler },
    // { CANON_AFINFO3, "Canon:AFInfo3",    TIFF_NOTYPE,  0, canon_blah_handler },
    // { CANON_ORIGINALDECISIONDATAOFFSET, "Canon:OriginalDecisionDataOffset", TIFF_NOTYPE,  0 },
    // { CANON_CUSTOMFUNCTIONS1D, "Canon:CustomFunctions1D", TIFF_NOTYPE,  0, canon_blah_handler },
    // { CANON_PERSONALFUNCTIONS, "Canon:PersonalFunctions", TIFF_NOTYPE,  0, canon_blah_handler },
    // { CANON_PERSONALFUNCTIONVALUES, "Canon:PersonalFunctionValues", TIFF_NOTYPE,  0, canon_blah_handler },
    // { CANON_FILEINFO, "Canon:FileInfo", TIFF_NOTYPE,  0, canon_blah_handler },
    // { CANON_AFPOINTSINFOCUS1D, "Canon:AFPointsInFocus1D", TIFF_NOTYPE,  0, canon_blah_handler },
    { CANON_LENSMODEL, "Canon:LensModel", TIFF_ASCII, 1 },
    // { CANON_SERIALINFO, "Canon:SerialInfo", TIFF_NOTYPE, 0, canon_blah_handler },
    // { CANON_DUSTREMOVALDATA, "Canon:DustRemovalData", TIFF_NOTYPE, 0, canon_blah_handler }, // unknown format
    { CANON_CROPINFO, "Canon:CropInfo", TIFF_SHORT, 4 },
    // { CANON_CUSTOMFUNCTIONS2, "Canon:CustomFunctions2", TIFF_NOTYPE,  0, canon_blah_handler },
    // { CANON_ASPECTINFO, "Canon:AspectInfo", TIFF_NOTYPE,  0, canon_blah_handler },
    // { CANON_PROCESSINGINFO, "Canon:ProcessingInfo", TIFF_NOTYPE,  0, canon_blah_handler },
    // CANON_TONECURVETABLE, ToneCurveTable
    // CANON_SHARPNESSTABLE, SharpnessTable
    // CANON_SHARPNESSFREQTABLE, SharpnessFreqTable
    // CANON_WHITEBALANCETABLE, WhiteBalanceTable
    // { CANON_COLORBALANCE, "Canon:ColorBalance", TIFF_NOTYPE,  0, canon_blah_handler },
    // { CANON_MEASUREDCOLOR, "Canon:MeasuredColor", TIFF_NOTYPE,  0, canon_blah_handler },
    { CANON_COLORTEMPERATURE, "Canon:ColorTemperature", TIFF_SHORT, 1 },
    // { CANON_CANONFLAGS, "Canon:CanonFlags", TIFF_NOTYPE,  0, canon_blah_handler },
    // { CANON_MODIFIEDINFO, "Canon:ModifiedInfo", TIFF_NOTYPE,  0, canon_blah_handler },
    // CANON_TONECURVEMATCHING, ToneCurveMatching
    // CANON_WHITEBALANCEMATCHING, WhiteBalanceMatching
    // CANON_COLORSPACE, ColorSpace, TIFF_SHORT, // 1=sRGB, 2=Adobe RGB
    // CANON_PREVIEWIMAGEINFO, PreviewImageInfo
    // CANON_VRDOFFSET, VRDOffset
    { CANON_SENSORINFO, "Canon:SensorInfo", TIFF_SHORT, 17, canon_sensorinfo_handler },
    // CANON_COLORDATA ColorData    varies by model
    // CANON_CRWPARAM CRWParam
    // CANON_FLAVOR Flavor
    // CANON_PICTURESTYLEUSERDEF, PictureStyleUserDef
    // CANON_PICTURESTYLEPC, PictureStylePC
    { CANON_CUSTOMPICTURESTYLEFILENAME, "Canon:CustomPictureStyleFileName", TIFF_ASCII, 1 },
    // CANON_AFMICROADJ, AFMicroAdj
    // CANON_VIGNETTINGCORR, VignettingCorr     varies by model
    // CANON_VIGNETTINGCORR2, VignettingCorr2
    // CANON_LIGHTINGOPT, LightingOpt
    // CANON_LENSINFO, LensInfo
    // CANON_AMBIENCEINFO, AmbienceInfo
    // CANON_MULTIEXP, MultiExp
    // CANON_FILTERINFO, FilterInfo
    // CANON_HDRINFO, HDRInfo
    // CANON_AFCONFIG, AFConfig
};



const TagMap& canon_maker_tagmap_ref () {
    static TagMap T ("Canon", canon_maker_tag_table);
    return T;
}



// Put a whole bunch of sub-indexed data into the spec into the given TIFF
// tag.
template<typename T>
static void
encode_indexed_tag (int tifftag, TIFFDataType tifftype, // TIFF tag and type
                    cspan<LabelIndex> indices,        // LabelIndex table
                    std::vector<char>& data,          // data blob to add to
                    std::vector<TIFFDirEntry> &dirs,  // TIFF dirs to add to
                    const ImageSpec& spec,            // spec to get attribs from
                    size_t offset_correction)         // offset correction
{
    // array length is determined by highest index value
    std::vector<T> array (indices.back().value + 1, T(0));
    bool anyfound = false;
    for (auto&& attr : indices) {
        if (attr.value < int(array.size())) {
            const ParamValue *param = spec.find_attribute (attr.label);
            if (param) {
                array[attr.value] = T (param->get_int());
                anyfound = true;
            }
        }
    }
    if (anyfound)
        append_tiff_dir_entry (dirs, data, tifftag, tifftype,
                               array.size(), array.data(), offset_correction);
}




void
encode_canon_makernote (std::vector<char>& data,
                        std::vector<TIFFDirEntry> &makerdirs,
                        const ImageSpec& spec, size_t offset_correction)
{
    // Easy ones that get coded straight from the attribs
    for (const TagInfo& t : canon_maker_tag_table) {
        if (t.handler)   // skip  ones with handlers
            continue;
        if (const ParamValue* param = spec.find_attribute (t.name)) {
            size_t count = t.tiffcount;
            const void* d = param->data();
            if (t.tifftype == TIFF_ASCII) {
                // special case: strings need their real length, plus
                // trailing null, and the data must be the characters.
                d = param->get_ustring().c_str();
                count = param->get_ustring().size() + 1;
            }
            append_tiff_dir_entry (makerdirs, data, t.tifftag, t.tifftype,
                                   count, d, offset_correction);
        }
    }

    // Hard ones that need to fill in complicated structures
    encode_indexed_tag<int16_t> (CANON_CAMERASETTINGS, TIFF_SSHORT,
                                 canon_camerasettings_indices,
                                 data, makerdirs, spec, offset_correction);
    encode_indexed_tag<uint16_t> (CANON_FOCALLENGTH, TIFF_SHORT,
                                 canon_focallength_indices,
                                 data, makerdirs, spec, offset_correction);
    encode_indexed_tag<int16_t> (CANON_SHOTINFO, TIFF_SSHORT,
                                 canon_shotinfo_indices,
                                 data, makerdirs, spec, offset_correction);
    encode_indexed_tag<int16_t> (CANON_SHOTINFO, TIFF_SSHORT,
                                 canon_shotinfo_indices,
                                 data, makerdirs, spec, offset_correction);
    encode_indexed_tag<int16_t> (CANON_PANORAMA, TIFF_SSHORT,
                                 canon_panorama_indices,
                                 data, makerdirs, spec, offset_correction);
}


}  // end namespace pvt
OIIO_NAMESPACE_END
