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pnginfo.c
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pnginfo.c
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/*
* Copyright (c) 2018,2022 Tristan Le Guern <[email protected]>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "config.h"
#include <ctype.h>
#if HAVE_ERR
# include <err.h>
#endif
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <zlib.h>
#include "lgpng.h"
void usage(void);
int info_zlib(uint8_t, uint8_t, uint8_t [4]);
void info_IHDR(struct IHDR *);
void info_PLTE(struct PLTE *);
void info_IDAT(uint8_t *, uint32_t, int);
void info_tRNS(struct IHDR *, struct PLTE *, uint8_t *, uint32_t);
void info_cHRM(uint8_t *, uint32_t);
void info_gAMA(uint8_t *, uint32_t);
void info_iCCP(uint8_t *, uint32_t);
void info_sBIT(struct IHDR *, uint8_t *, uint32_t);
void info_sRGB(uint8_t *, uint32_t);
void info_cICP(uint8_t *, uint32_t);
void info_tEXt(uint8_t *, uint32_t);
void info_zTXt(uint8_t *, uint32_t);
void info_bKGD(struct IHDR *, struct PLTE *, uint8_t *, uint32_t);
void info_hIST(struct PLTE *, uint8_t *, uint32_t);
void info_pHYs(uint8_t *, uint32_t);
void info_sPLT(uint8_t *, uint32_t);
void info_eXIf(uint8_t *, uint32_t);
void info_tIME(uint8_t *, uint32_t);
void info_acTL(uint8_t *, uint32_t);
void info_fcTL(uint8_t *, uint32_t);
void info_fdAT(uint8_t *, uint32_t);
void info_oFFs(uint8_t *, uint32_t);
void info_gIFg(uint8_t *, uint32_t);
void info_gIFx(uint8_t *, uint32_t);
void info_sTER(uint8_t *, uint32_t);
void info_vpAg(uint8_t *, uint32_t);
void info_caNv(uint8_t *, uint32_t);
void info_orNt(uint8_t *, uint32_t);
void info_skMf(uint8_t *, uint32_t);
void info_skRf(uint8_t *, uint32_t);
void info_waLV(uint8_t *, uint32_t);
void info_msOG(uint8_t *, uint32_t);
void info_tpNG(uint8_t *, uint32_t);
void info_unknown(uint8_t [4], uint8_t *, uint32_t);
int
main(int argc, char *argv[])
{
int ch, idatnum = 0;
long offset;
bool cflag = false;
bool lflag = true, sflag = false;
bool loopexit = false;
struct IHDR ihdr;
struct PLTE plte;
FILE *source = stdin;
uint8_t target_chunk[4] = {0, 0, 0, 0};
#if HAVE_PLEDGE
pledge("stdio rpath", NULL);
#endif
(void)memset(&ihdr, 0, sizeof(ihdr));
(void)memset(&plte, 0, sizeof(plte));
while (-1 != (ch = getopt(argc, argv, "c:df:ls")))
switch (ch) {
case 'c':
cflag = true;
lflag = false;
(void)memcpy(target_chunk, optarg, 4);
break;
case 'f':
if (NULL == (source = fopen(optarg, "r"))) {
err(EXIT_FAILURE, "%s", optarg);
}
break;
case 'l':
cflag = false;
lflag = true;
break;
case 's':
sflag = true;
break;
default:
usage();
}
argc -= optind;
argv += optind;
/* Read the file byte by byte until the PNG signature is found */
offset = 0;
if (false == sflag) {
if (LGPNG_OK != lgpng_stream_is_png(source)) {
errx(EXIT_FAILURE, "not a PNG file");
}
} else {
do {
if (0 != feof(source) || 0 != ferror(source)) {
errx(EXIT_FAILURE, "not a PNG file");
}
if (0 != fseek(source, offset, SEEK_SET)) {
errx(EXIT_FAILURE, "not a PNG file");
}
offset += 1;
} while (LGPNG_OK != lgpng_stream_is_png(source));
}
do {
unsigned int err;
uint32_t length = 0, chunk_crc = 0, calc_crc = 0;
uint8_t *data = NULL;
uint8_t current_chunk[4] = {0, 0, 0, 0};
if (LGPNG_OK != lgpng_stream_get_length(source, &length)) {
break;
}
/*
* Keep processing in case of invalid chunks
*/
err = lgpng_stream_get_type(source, current_chunk);
if (LGPNG_INVALID_CHUNK_NAME == err) {
warnx("Invalid chunk type -- %.4s", current_chunk);
} else if (LGPNG_OK != err) {
loopexit = 1;
goto stop;
}
/*
* Do not bother allocating memory in -l mode
*/
if (cflag) {
if (NULL == (data = malloc(length + 1))) {
warn("malloc(length + 1)");
break;
}
if (LGPNG_OK != lgpng_stream_get_data(source, length, &data)) {
goto stop;
}
} else if (lflag) {
(void)lgpng_stream_skip_data(source, length);
} else {
warnx("Internal error");
break;
}
if (LGPNG_OK != lgpng_stream_get_crc(source, &chunk_crc)) {
goto stop;
}
/* Validate the CRC in chunk mode */
if (cflag) {
lgpng_chunk_crc(length, current_chunk, data, &calc_crc);
if (chunk_crc != calc_crc) {
warnx("Invalid CRC for chunk %.4s, skipping",
current_chunk);
goto stop;
}
}
if (lflag) {
/* Simply list chunks' name */
printf("%.4s\n", current_chunk);
} else if (cflag) {
if (calc_crc != chunk_crc) {
warnx("Difference between CRC and reality for chunk %.4s (%u vs %u)", current_chunk, chunk_crc, calc_crc);
}
/*
* The IHDR chunk contains important information used to
* decode other chunks, such as bKGD, sBIT and tRNS.
*/
if (0 == memcmp(current_chunk, "IHDR", 4)) {
if (-1 == lgpng_create_IHDR_from_data(&ihdr,
data, length)) {
warnx("IHDR: Invalid IHDR chunk");
loopexit = true;
goto stop;
}
}
/*
* The hIST chunk mirrors the size of the PLTE chunk,
* so it is important to keep it around if it is encountered.
*/
if (0 == memcmp(current_chunk, "PLTE", 4)) {
if (-1 == lgpng_create_PLTE_from_data(&plte,
data, length)) {
loopexit = true;
warnx("PLTE: Invalid PLTE chunk");
goto stop;
}
}
/*
* Now handle the current chunk.
*/
if (0 == memcmp(current_chunk, target_chunk, 4)) {
if (0 == memcmp(current_chunk, "IHDR", 4)) {
info_IHDR(&ihdr);
} else if (0 == memcmp(current_chunk, "PLTE", 4)) {
info_PLTE(&plte);
} else if (0 == memcmp(current_chunk, "IDAT", 4)) {
info_IDAT(data, length, idatnum);
idatnum += 1;
} else if (0 == memcmp(current_chunk, "tRNS", 4)) {
info_tRNS(&ihdr, &plte, data, length);
} else if (0 == memcmp(current_chunk, "cHRM", 4)) {
info_cHRM(data, length);
} else if (0 == memcmp(current_chunk, "gAMA", 4)) {
info_gAMA(data, length);
} else if (0 == memcmp(current_chunk, "iCCP", 4)) {
info_iCCP(data, length);
} else if (0 == memcmp(current_chunk, "sBIT", 4)) {
info_sBIT(&ihdr, data, length);
} else if (0 == memcmp(current_chunk, "sRGB", 4)) {
info_sRGB(data, length);
} else if (0 == memcmp(current_chunk, "cICP", 4)) {
info_cICP(data, length);
} else if (0 == memcmp(current_chunk, "tEXt", 4)) {
info_tEXt(data, length);
} else if (0 == memcmp(current_chunk, "zTXt", 4)) {
info_zTXt(data, length);
} else if (0 == memcmp(current_chunk, "bKGD", 4)) {
info_bKGD(&ihdr, &plte, data, length);
} else if (0 == memcmp(current_chunk, "hIST", 4)) {
info_hIST(&plte, data, length);
} else if (0 == memcmp(current_chunk, "pHYs", 4)) {
info_pHYs(data, length);
} else if (0 == memcmp(current_chunk, "sPLT", 4)) {
info_sPLT(data, length);
} else if (0 == memcmp(current_chunk, "eXIf", 4)) {
info_eXIf(data, length);
} else if (0 == memcmp(current_chunk, "tIME", 4)) {
info_tIME(data, length);
} else if (0 == memcmp(current_chunk, "acTL", 4)) {
info_acTL(data, length);
} else if (0 == memcmp(current_chunk, "fcTL", 4)) {
info_fcTL(data, length);
} else if (0 == memcmp(current_chunk, "fdAT", 4)) {
info_fdAT(data, length);
} else if (0 == memcmp(current_chunk, "oFFs", 4)) {
info_oFFs(data, length);
} else if (0 == memcmp(current_chunk, "gIFg", 4)) {
info_gIFg(data, length);
} else if (0 == memcmp(current_chunk, "gIFx", 4)) {
info_gIFx(data, length);
} else if (0 == memcmp(current_chunk, "sTER", 4)) {
info_sTER(data, length);
} else if (0 == memcmp(current_chunk, "vpAg", 4)) {
info_vpAg(data, length);
} else if (0 == memcmp(current_chunk, "caNv", 4)) {
info_caNv(data, length);
} else if (0 == memcmp(current_chunk, "orNt", 4)) {
info_orNt(data, length);
} else if (0 == memcmp(current_chunk, "skMf", 4)) {
info_skMf(data, length);
} else if (0 == memcmp(current_chunk, "skRf", 4)) {
info_skRf(data, length);
} else if (0 == memcmp(current_chunk, "waLV", 4)) {
info_waLV(data, length);
} else if (0 == memcmp(current_chunk, "msOG", 4)) {
info_msOG(data, length);
} else if (0 == memcmp(current_chunk, "tpNG", 4) || 0 == memcmp(current_chunk, "tpNg", 4)) {
info_tpNG(data, length);
} else {
info_unknown(current_chunk, data, length);
}
}
free(data);
data = NULL;
} else {
warnx("Internal error");
break;
}
stop:
if (0 == memcmp(current_chunk, "IEND", 4)) {
loopexit = true;
}
} while(! loopexit);
fclose(source);
return(EXIT_SUCCESS);
}
int
info_zlib(uint8_t cmf, uint8_t flg, uint8_t chunk[4])
{
uint8_t cm, cinfo;
uint8_t fcheck, fdict, flevel;
const char *level;
/* See RFC1950 ZLIB Data Format */
/* cmf */
cm = cmf & 0x0f;
if (cm != 8) {
fprintf(stderr, "%.4s: zlib invalid compression method %i\n",
chunk, cm);
return(-1);
}
cinfo = (cmf & 0xf0) >> 4;
if (cinfo > 7) {
fprintf(stderr, "%.4s: zlib invalid compression info %i\n",
chunk, cinfo);
return(-1);
}
/* flg */
fcheck = (flg & 0xf0) >> 4;
fdict = flg & (0x01 << 5);
if (fdict == 1) {
fprintf(stderr, "%.4s: zlib invalid compression info: "
"preset dictionary\n", chunk);
}
flevel = (flg & 0xc0) >> 6;
switch (flevel) {
case 0: level = "fastest"; break;
case 1: level = "fast"; break;
case 2: level = "default"; break;
case 3: level = "slowest"; break;
default: level = "error"; break;
}
printf("%.4s: zlib compression method: %i\n", chunk, cm);
printf("%.4s: zlib window size: %i\n", chunk, cinfo);
printf("%.4s: zlib check bits: %i\n", chunk, fcheck);
printf("%.4s: zlib presset dictionnary: %s\n", chunk,
fdict ? "true" : "false");
printf("%.4s: zlib compression level: %s\n", chunk, level);
return(0);
}
void
info_IHDR(struct IHDR *ihdr)
{
if (0 == ihdr->data.width) {
warnx("IHDR: Invalid width 0");
}
if (0 == ihdr->data.height) {
warnx("IHDR: Invalid height 0");
}
switch (ihdr->data.colourtype) {
case COLOUR_TYPE_GREYSCALE:
if (1 != ihdr->data.bitdepth && 2 != ihdr->data.bitdepth
&& 4 != ihdr->data.bitdepth && 8 != ihdr->data.bitdepth
&& 16 != ihdr->data.bitdepth) {
warnx("IHDR: Invalid bit depth %i, should be 1, 2, 4, 8 or 16", ihdr->data.bitdepth);
}
break;
case COLOUR_TYPE_TRUECOLOUR_ALPHA:
/* FALLTHROUGH */
case COLOUR_TYPE_GREYSCALE_ALPHA:
/* FALLTHROUGH */
case COLOUR_TYPE_TRUECOLOUR:
if ( 8 != ihdr->data.bitdepth && 16 != ihdr->data.bitdepth) {
warnx("IHDR: Invalid bit depth %i, should be 8 or 16",
ihdr->data.bitdepth);
}
break;
case COLOUR_TYPE_INDEXED:
if (1 != ihdr->data.bitdepth && 2 != ihdr->data.bitdepth
&& 4 != ihdr->data.bitdepth && 8 != ihdr->data.bitdepth) {
warnx("IHDR: Invalid bit depth %i, should be 1, 2, 4 or 8", ihdr->data.bitdepth);
}
break;
case COLOUR_TYPE_FILLER1:
case COLOUR_TYPE_FILLER5:
case COLOUR_TYPE__MAX:
default:
warnx("IHDR: Invalid colour type %i", ihdr->data.colourtype);
ihdr->data.colourtype = COLOUR_TYPE_FILLER1;
}
printf("IHDR: width: %u\n", ihdr->data.width);
printf("IHDR: height: %u\n", ihdr->data.height);
printf("IHDR: bitdepth: %i\n", ihdr->data.bitdepth);
printf("IHDR: colourtype: %s\n", colourtypemap[ihdr->data.colourtype]);
if (COMPRESSION_TYPE_DEFLATE != ihdr->data.compression) {
warnx("IHDR: Invalid compression type %i", ihdr->data.compression);
} else {
printf("IHDR: compression: %s\n",
compressiontypemap[ihdr->data.compression]);
}
if (FILTER_METHOD_ADAPTIVE != ihdr->data.filter) {
warnx("IHDR: Invalid filter method %i", ihdr->data.filter);
} else {
printf("IHDR: filter: %s\n", filtermethodmap[ihdr->data.filter]);
}
if (INTERLACE_METHOD_STANDARD != ihdr->data.interlace
&& INTERLACE_METHOD_ADAM7 != ihdr->data.interlace) {
warnx("IHDR: Invalid interlace method %i", ihdr->data.interlace);
} else {
printf("IHDR: interlace method: %s\n",
interlacemap[ihdr->data.interlace]);
}
}
void
info_PLTE(struct PLTE *plte)
{
printf("PLTE: %zu entries\n", plte->data.entries);
for (size_t i = 0; i < plte->data.entries; i++) {
printf("PLTE: entry %3zu: 0x%02x%02x%02x\n", i,
plte->data.entry[i].red,
plte->data.entry[i].green,
plte->data.entry[i].blue);
}
}
void
info_IDAT(uint8_t *data, uint32_t dataz, int idatnum)
{
struct IDAT idat;
(void)lgpng_create_IDAT_from_data(&idat, data, dataz);
printf("IDAT: compressed bytes %u\n", idat.length);
if (dataz && idatnum == 0) {
info_zlib(data[0], data[1], (uint8_t *)"IDAT");
}
}
void
info_tRNS(struct IHDR *ihdr, struct PLTE *plte, uint8_t *data, uint32_t dataz)
{
struct tRNS trns;
if (-1 == lgpng_create_tRNS_from_data(&trns, ihdr, data, dataz)) {
warnx("Bad tRNS chunk, skipping.");
return;
}
switch (ihdr->data.colourtype) {
case COLOUR_TYPE_GREYSCALE:
printf("tRNS: gray: %u\n", trns.data.gray);
break;
case COLOUR_TYPE_TRUECOLOUR:
printf("tRNS: red: %u\n", trns.data.red);
printf("tRNS: green: %u\n", trns.data.green);
printf("tRNS: blue: %u\n", trns.data.blue);
break;
case COLOUR_TYPE_INDEXED:
if (trns.data.entries > plte->data.entries) {
warnx("tRNS should not have more entries than PLTE");
}
for (size_t i = 0; i < trns.data.entries; i++) {
printf("tRNS: palette index %zu: %u\n",
i, trns.data.palette[i]);
}
break;
default:
errx(EXIT_FAILURE, "%s: wrong call to info_tRNS", getprogname());
}
}
void
info_cHRM(uint8_t *data, uint32_t dataz)
{
double whitex, whitey;
double redx, redy;
double greenx, greeny;
double bluex, bluey;
struct cHRM chrm;
if (-1 == lgpng_create_cHRM_from_data(&chrm, data, dataz)) {
warnx("Bad cHRM chunk, skipping.");
return;
}
whitex = (double)chrm.data.whitex / 100000.0;
whitey = (double)chrm.data.whitey / 100000.0;
redx = (double)chrm.data.redx / 100000.0;
redy = (double)chrm.data.redy / 100000.0;
greenx = (double)chrm.data.greenx / 100000.0;
greeny = (double)chrm.data.greeny / 100000.0;
bluex = (double)chrm.data.bluex / 100000.0;
bluey = (double)chrm.data.bluey / 100000.0;
printf("cHRM: white point x: %f\n", whitex);
printf("cHRM: white point y: %f\n", whitey);
printf("cHRM: red x: %f\n", redx);
printf("cHRM: red y: %f\n", redy);
printf("cHRM: green x: %f\n", greenx);
printf("cHRM: green y: %f\n", greeny);
printf("cHRM: blue x: %f\n", bluex);
printf("cHRM: blue y: %f\n", bluey);
}
void
info_gAMA(uint8_t *data, uint32_t dataz)
{
struct gAMA gama;
if (-1 == lgpng_create_gAMA_from_data(&gama, data, dataz)) {
warnx("Bad gAMA chunk, skipping.");
return;
}
printf("gAMA: image gamma: %u\n", gama.data.gamma);
}
void
info_iCCP(uint8_t *data, uint32_t dataz)
{
struct iCCP iccp;
if (-1 == lgpng_create_iCCP_from_data(&iccp, data, dataz)) {
warnx("Bad iCCP chunk, skipping.");
return;
}
printf("iCCP: profile name: %.80s\n", iccp.data.name);
printf("iCCP: compression method: %s\n",
compressiontypemap[iccp.data.compression]);
info_zlib(iccp.data.profile[0], iccp.data.profile[1], (uint8_t *)"iCCP");
}
void
info_sBIT(struct IHDR *ihdr, uint8_t *data, uint32_t dataz)
{
struct sBIT sbit;
if (-1 == lgpng_create_sBIT_from_data(&sbit, ihdr, data, dataz)) {
warnx("Bad sBIT chunk, skipping.");
return;
}
if (COLOUR_TYPE_GREYSCALE == ihdr->data.colourtype
|| COLOUR_TYPE_GREYSCALE_ALPHA == ihdr->data.colourtype) {
printf("sBIT: significant greyscale bits: %i\n",
sbit.data.sgreyscale);
} else if (COLOUR_TYPE_TRUECOLOUR == ihdr->data.colourtype
|| COLOUR_TYPE_INDEXED == ihdr->data.colourtype
|| COLOUR_TYPE_TRUECOLOUR_ALPHA == ihdr->data.colourtype) {
printf("sBIT: significant red bits: %i\n",
sbit.data.sred);
printf("sBIT: significant green bits: %i\n",
sbit.data.sgreen);
printf("sBIT: significant blue bits: %i\n",
sbit.data.sblue);
}
if (COLOUR_TYPE_GREYSCALE_ALPHA == ihdr->data.colourtype
|| COLOUR_TYPE_TRUECOLOUR_ALPHA == ihdr->data.colourtype) {
printf("sBIT: significant alpha bits: %i\n",
sbit.data.salpha);
}
}
void
info_sRGB(uint8_t *data, uint32_t dataz)
{
struct sRGB srgb;
if (-1 == lgpng_create_sRGB_from_data(&srgb, data, dataz)) {
warnx("Bad sRGB chunk, skipping.");
return;
}
if (srgb.data.intent >= RENDERING_INTENT__MAX) {
warnx("sRGB: invalid rendering intent value");
return;
}
printf("sRGB: rendering intent: %s\n",
rendering_intentmap[srgb.data.intent]);
}
void
info_cICP(uint8_t *data, uint32_t dataz)
{
struct cICP cicp;
if (-1 == lgpng_create_cICP_from_data(&cicp, data, dataz)) {
warnx("Bad cICP chunk, skipping.");
return;
}
printf("cICP: colour primaries: %d\n", cicp.data.colour_primaries);
printf("cICP: transfer function: %d\n", cicp.data.transfer_function);
printf("cICP: matrix coefficients: %d\n", cicp.data.matrix_coefficients);
printf("cICP: video full range flag: %d\n", cicp.data.video_full_range);
}
void
info_tEXt(uint8_t *data, uint32_t dataz)
{
struct tEXt text;
if (-1 == lgpng_create_tEXt_from_data(&text, data, dataz)) {
warnx("Bad tEXt chunk, skipping.");
return;
}
if (!lgpng_is_official_keyword(text.data.keyword,
strlen((char *)text.data.keyword))) {
printf("tEXt: %s is not an official keyword\n",
text.data.keyword);
}
printf("tEXt: %s: %s\n", text.data.keyword, text.data.text);
}
void
info_zTXt(uint8_t *data, uint32_t dataz)
{
unsigned int retry = 2;
int zret;
size_t outz, outtmpz;
struct zTXt ztxt;
uint8_t *out = NULL, *outtmp = NULL;
if (-1 == lgpng_create_zTXt_from_data(&ztxt, data, dataz)) {
warnx("Bad zTXt chunk, skipping.");
return;
}
if (!lgpng_is_official_keyword(ztxt.data.keyword,
strlen((char *)ztxt.data.keyword))) {
printf("zTXt: %s is not an official keyword\n",
ztxt.data.keyword);
}
printf("zTXt: compression method: %s\n",
compressiontypemap[ztxt.data.compression]);
info_zlib(ztxt.data.text[0], ztxt.data.text[1], (uint8_t *)"zTXt");
do {
outtmpz = ztxt.data.textz * retry;
if (NULL == (outtmp = realloc(out, outtmpz + 1))) {
warn("realloc(outtmpz + 1)");
goto error;
}
out = outtmp;
outz = outtmpz;
zret = uncompress(out, &outz, ztxt.data.text, ztxt.data.textz);
if (Z_BUF_ERROR != zret && Z_OK != zret) {
if (Z_MEM_ERROR == zret) {
warn("uncompress(ztxt.data.textz)");
} else if (Z_DATA_ERROR == zret) {
warnx("Invalid input data");
}
warnx("zTXt: Failed decompression");
goto error;
}
out[outz] = '\0';
retry += 1;
} while (Z_OK != zret);
if (outz > ztxt.data.textz) {
printf("zTXt: compressed data is bigger than uncompressed\n");
}
printf("zTXt: keyword: %s\n", ztxt.data.keyword);
printf("zTXt: text: %s\n", out);
error:
free(out);
out = NULL;
outz = 0;
}
void
info_bKGD(struct IHDR *ihdr, struct PLTE *plte, uint8_t *data, uint32_t dataz)
{
struct bKGD bkgd;
if (-1 == lgpng_create_bKGD_from_data(&bkgd, ihdr, plte, data, dataz)) {
warnx("Bad bKGD chunk");
return;
}
switch (ihdr->data.colourtype) {
case COLOUR_TYPE_GREYSCALE:
/* FALLTHROUGH */
case COLOUR_TYPE_GREYSCALE_ALPHA:
if (ihdr->data.bitdepth < 16) {
if (0 != MSB16(bkgd.data.greyscale)) {
printf("bKGD: MSB is not zero for greyscale value\n");
}
printf("bKGD: greyscale 0x%04x\n",
LSB16(bkgd.data.greyscale));
} else {
printf("bKGD: greyscale 0x%04x\n", bkgd.data.greyscale);
}
break;
case COLOUR_TYPE_TRUECOLOUR:
/* FALLTHROUGH */
case COLOUR_TYPE_TRUECOLOUR_ALPHA:
if (ihdr->data.bitdepth < 16) {
if (0 != MSB16(bkgd.data.rgb.red)) {
printf("bKGD: MSB is not zero for red value\n");
}
if (0 != MSB16(bkgd.data.rgb.green)) {
printf("bKGD: MSB is not zero for green value\n");
}
if (0 != MSB16(bkgd.data.rgb.blue)) {
printf("bKGD: MSB is not zero for blue value\n");
}
printf("bKGD: rgb value 0x%x%x%x\n",
LSB16(bkgd.data.rgb.red),
LSB16(bkgd.data.rgb.green),
LSB16(bkgd.data.rgb.blue));
} else {
printf("bKGD: rgb value 0x%x%x%x\n",
bkgd.data.rgb.red,
bkgd.data.rgb.green,
bkgd.data.rgb.blue);
}
break;
case COLOUR_TYPE_INDEXED:
printf("bKGD: palette index %u\n", bkgd.data.paletteindex);
printf("bKGD: PLTE entry 0x%02x%02x%02x\n",
plte->data.entry[bkgd.data.paletteindex].red,
plte->data.entry[bkgd.data.paletteindex].green,
plte->data.entry[bkgd.data.paletteindex].blue);
break;
}
}
void
info_hIST(struct PLTE *plte, uint8_t *data, uint32_t dataz)
{
struct hIST hist;
if (-1 == lgpng_create_hIST_from_data(&hist, plte, data, dataz)) {
warnx("Bad hIST chunk");
return;
}
for (size_t i = 0; i < plte->data.entries; i++) {
printf("hIST: entry %3zu: %d\n", i,
hist.data.frequency[i]);
}
}
void
info_pHYs(uint8_t *data, uint32_t dataz)
{
struct pHYs phys;
if (-1 == lgpng_create_pHYs_from_data(&phys, data, dataz)) {
warnx("Bad pHYs chunk");
return;
}
printf("pHYs: pixel per unit, X axis: %u\n", phys.data.ppux);
printf("pHYs: pixel per unit, Y axis: %u\n", phys.data.ppuy);
printf("pHYs: unit specifier: %s\n",
unitspecifiermap[phys.data.unitspecifier]);
}
void
info_sPLT(uint8_t *data, uint32_t dataz)
{
struct sPLT splt;
if (-1 == lgpng_create_sPLT_from_data(&splt, data, dataz)) {
warnx("Bad sPLT chunk, skipping.");
return;
}
printf("sPLT: palette name: %s\n", splt.data.palettename);
printf("sPLT: sample depth: %i\n", splt.data.sampledepth);
printf("sPLT: %zu entries\n", splt.data.entries);
}
void
info_eXIf(uint8_t *data, uint32_t dataz)
{
struct eXIf exif;
uint8_t little_endian[4] = { 73, 73, 42, 0};
uint8_t big_endian[4] = { 77, 77, 0, 42};
lgpng_create_eXIf_from_data(&exif, data, dataz);
if (0 == memcmp(exif.data.profile, little_endian, 4)) {
printf("eXIf: endianese: little-endian\n");
} else if (0 == memcmp(exif.data.profile, big_endian, 4)) {
printf("eXIf: endianese: big-endian\n");
} else {
printf("eXIf: endianese: weird\n");
}
}
void
info_tIME(uint8_t *data, uint32_t dataz)
{
struct tIME time;
if (-1 == lgpng_create_tIME_from_data(&time, data, dataz)) {
warnx("Bad tIME chunk, skipping.");
return;
}
if (time.data.month == 0 || time.data.month > 12) {
warnx("tIME: invalid month value");
}
if (time.data.day == 0 || time.data.day > 31) {
warnx("tIME: invalid day value");
}
if (time.data.hour > 23) {
warnx("tIME: invalid hour value");
}
if (time.data.minute > 59) {
warnx("tIME: invalid minute value");
}
if (time.data.second > 60) {
warnx("tIME: invalid second value");
}
printf("tIME: %i-%02i-%02i %02i:%02i:%02i\n",
time.data.year, time.data.month, time.data.day,
time.data.hour, time.data.minute, time.data.second);
}
void
info_acTL(uint8_t *data, uint32_t dataz)
{
struct acTL actl;
if (-1 == lgpng_create_acTL_from_data(&actl, data, dataz)) {
warnx("Bad acTL chunk, skipping.");
return;
}
printf("acTL: number of frames: %u\n", actl.data.num_frames);
if (0 == actl.data.num_plays) {
printf("acTL: number of plays: indefinitely\n");
} else {
printf("acTL: number of plays: %u\n", actl.data.num_plays);
}
}
void
info_fcTL(uint8_t *data, uint32_t dataz)
{
struct fcTL fctl;
if (-1 == lgpng_create_fcTL_from_data(&fctl, data, dataz)) {
warnx("Bad fcTL chunk, skipping.");
return;
}
printf("fcTL: squence number: %u\n", fctl.data.sequence_number);
printf("fcTL: width: %u\n", fctl.data.width);
printf("fcTL: height: %u\n", fctl.data.height);
printf("fcTL: x_offset: %u\n", fctl.data.x_offset);
printf("fcTL: y_offset: %u\n", fctl.data.y_offset);
printf("fcTL: delay_num: %u\n", fctl.data.delay_num);
printf("fcTL: delay_den: %u\n", fctl.data.delay_den);
printf("fcTL: dispose_op: %s\n", dispose_opmap[fctl.data.dispose_op]);
printf("fcTL: blend_op: %s\n", blend_opmap[fctl.data.blend_op]);
}
void
info_fdAT(uint8_t *data, uint32_t dataz)
{
struct fdAT fdat;
if (-1 == lgpng_create_fdAT_from_data(&fdat, data, dataz)) {
warnx("Bad fdAT chunk, skipping.");
return;
}
printf("fdAT: squence number: %u\n", fdat.data.sequence_number);
}
void
info_oFFs(uint8_t *data, uint32_t dataz)
{
struct oFFs offs;
if (-1 == lgpng_create_oFFs_from_data(&offs, data, dataz)) {
warnx("Bad oFFs chunk, skipping.");
return;
}
printf("oFFs: x position: %d\n", offs.data.x_position);
printf("oFFs: y position: %d\n", offs.data.y_position);
printf("oFFs: unit specifier: %s\n", offsunitspecifiermap[offs.data.unitspecifier]);
}
void
info_gIFg(uint8_t *data, uint32_t dataz)
{
struct gIFg gifg;
if (-1 == lgpng_create_gIFg_from_data(&gifg, data, dataz)) {
warnx("Bad gIFg chunk, skipping.");
return;
}
printf("gIFg: disposal method: %s\n", disposal_methodmap[gifg.data.disposal_method]);
printf("gIFg: user input: %s\n", user_inputmap[gifg.data.user_input]);
printf("gIFg: delay time: %hu\n", gifg.data.delay_time);
}
void
info_gIFx(uint8_t *data, uint32_t dataz)
{
struct gIFx gifx;
if (-1 == lgpng_create_gIFx_from_data(&gifx, data, dataz)) {
warnx("Bad gIFx chunk, skipping.");
return;
}
printf("gIFx: application identifier: %.8s\n", gifx.data.identifier);
printf("gIFx: application code: %.3s\n", gifx.data.code);
printf("gIFx: application data: ");
if (gifx.length - 11 > 0) {
for (unsigned long i = 0; i < gifx.length - 11; i++) {
printf("%x", data[i + 11]);
if (i != gifx.length - 12) {
printf(" ");
}
}
printf("\n");
}
}
void
info_sTER(uint8_t *data, uint32_t dataz)
{
struct sTER ster;
if (-1 == lgpng_create_sTER_from_data(&ster, data, dataz)) {
warnx("Bad gIFx chunk, skipping.");
return;
}
if (ster.data.mode > 2) {
printf("sTER: mode: unknown\n");
} else {
printf("sTER: mode: %s\n", ster_mode_map[ster.data.mode]);
}
}
void
info_vpAg(uint8_t *data, uint32_t dataz)
{
struct vpAg vpag;
if (-1 == lgpng_create_vpAg_from_data(&vpag, data, dataz)) {
warnx("Bad vpAg chunk, skipping.");
return;
}
printf("vpAg: width: %u\n", vpag.data.width);
printf("vpAg: height: %u\n", vpag.data.height);
printf("vpAg: unit specifier: %s\n", vpagunitspecifiermap[vpag.data.unitspecifier]);
}
void
info_caNv(uint8_t *data, uint32_t dataz)
{
struct caNv canv;
if (-1 == lgpng_create_caNv_from_data(&canv, data, dataz)) {
warnx("Bad caNv chunk, skipping.");
return;
}
printf("caNv: width: %u\n", canv.data.width);
printf("caNv: height: %u\n", canv.data.height);
printf("caNv: x position: %d\n", canv.data.x_position);
printf("caNv: y position: %d\n", canv.data.y_position);
}
void
info_orNt(uint8_t *data, uint32_t dataz)
{
struct orNt ornt;
if (-1 == lgpng_create_orNt_from_data(&ornt, data, dataz)) {
warnx("Bad orNt chunk, skipping.");
return;
}
printf("orNt: orientation: %s\n", orientationmap[ornt.data.orientation]);
}
void
info_skMf(uint8_t *data, uint32_t dataz)
{
struct skMf skmf;
if (-1 == lgpng_create_skMf_from_data(&skmf, data, dataz)) {
warnx("Bad skMf chunk, skipping.");
return;
}
printf("skMf: json data: %s\n", skmf.data.json);
}
void
info_skRf(uint8_t *data, uint32_t dataz)
{
struct skRf skrf;
if (-1 == lgpng_create_skRf_from_data(&skrf, data, dataz)) {
warnx("Bad skRf chunk, skipping.");
return;
}
printf("skRf: header: %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x\n",
skrf.data.header[0], skrf.data.header[1], skrf.data.header[2],
skrf.data.header[3], skrf.data.header[4], skrf.data.header[5],
skrf.data.header[6], skrf.data.header[7], skrf.data.header[8],
skrf.data.header[9], skrf.data.header[11], skrf.data.header[12],
skrf.data.header[13], skrf.data.header[14], skrf.data.header[15]);
printf("skRf: embeded PNG image size: %u bytes\n", skrf.length - 16);
}
void
info_waLV(uint8_t *data, uint32_t dataz)
{
struct waLV walv;
if (-1 == lgpng_create_waLV_from_data(&walv, data, dataz)) {
warnx("Bad skRf chunk, skipping.");
return;
}