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jpegdump.c
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jpegdump.c
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/*
jpegdump.c - dump JPEG marker information
v1.00 1992.06.09 initial release
v1.01 1992.06.22 non-JFIF APP0 markers didn't display first five bytes
v1.02 1992.07.20 eliminated fseeks which seem to be broken, even for
forward seeks only, on pipes on some systems
v1.03 1992.08.24 added offset and stop at eoi options
v1.04 1992.08.24 added parsing of JFIF extension markers as per JFIF
v1.02 draft of 1992.08.21
v1.05 1992.08.25 added -r to recurse into JPEG compressed thumbnails
(completely untested; probably doesn't work)
v1.06 1992.09.14 incorporated Phil Richards' code to guess cjpeg quality
factor
v1.07 1992.09.15 added extension 0x13 per final JFIF 1.02; repaired bugs
in thumbnail-related code
v1.08 1992.12.23 Provide multiple levels of verbosity; miscellaneous
cleanups
v1.09 1993.03.01 Add switch for hex/char printout of COM,APPn data
v1.10 1993.10.26 Identify -q 100 quant tables correctly; more tweaking
of verbosity levels
1994.10.18 Report pad bytes and extraneous data between markers
v1.11 1995.09.23 Include JPEG process name in terse output for SOFn
v1.12 1995.11.22 Print DQT tables in normal array order, not zigzag order
v1.13 1996.05.31 Handle JPEG Part 3 extension markers, including SPIFF.
Add summary table printout for DHT tables, tweak
verbosity some more. Detect out-of-order RSTn markers.
v1.14 1997.05.11 Do some elementary formatting of Adobe APP13 markers.
You'll need the Photoshop SDK documentation to make
any sense of these, though.
Copyright (c) 1992 Handmade Software, Inc.
by Allan N. Hessenflow
Permission to use, copy, modify, and distribute this software and
its documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and
that both that copyright notice and this permission notice appear in
supporting documentation. This software is provided "as is" without
express or implied warranty.
Usage:
jpegdump [-help] [-q] [-v] [-o n] [-c] [-noc] [-r] [-nor] [-hex] [-nohex]
[file1 [file2...]]
-q quiet: minimal information printed
-v verbose: more information printed (multiple -v's give more output)
-o n skip first n bytes of file (1234 is decimal, 0x1234 for hex)
-c continue past EOI to actual end of file (default)
-noc stop upon seeing EOI marker
-r recurse into jpeg compressed thumbnails
-nor don't recurse into thumbnails (default)
-hex show COM and APPn data in hex
-nohex show COM and APPn data in ASCII when possible (default)
The numbers printed in the `Approximate quality factor' line are as follows:
Quality: an estimate of the quality factor used when cjpeg was run.
Scaling factor (scale): mean ratio between quantization table entries
and JPEG sample table entries, times 100.
Variance (var): squared standard deviation of the above ratio.
If this is larger than about 2, then the table is not a simple
multiple of the standard's sample table, so the file was NOT
generated by cjpeg and the quality estimate is dubious.
Verbosity levels:
-q one-line summary of SOF parameters
default SOF parameters and qtable quality factor estimates
-v Show all markers except RSTn; no contents of DQT or DHT tables
-v -v Also show actual contents of DQT tables
3 -v's Also show summary of DHT table contents
4 -v's Also show exact contents of DHT tables
5 -v's Also report all RSTn markers
A recursed-into thumbnail is shown at one verbosity level less than the
main image.
Bugs:
garbage in, garbage out
Build instructions:
MSC v7.00 (substitute the path to setargv.obj for \c700\lib\):
cl jpegdump.c \c700\lib\setargv.obj /link /NOE
Watcom C/386 v9.0 (substitute the path to wildargv.c for \watcom\src\starup\)
wcl386 jpegdump.c \watcom\src\startup\wildargv.c
acc:
acc jpegdump.c -o jpegdump
gcc:
gcc jpegdump.c -o jpegdump
others:
any ANSI C compiler should work. If you don't define CASESENSITIVE
then you may need to provide your own strnicmp on some systems; this
is just a case insensitive version of strncmp. If you're too lazy
to do that, just define CASESENSITIVE and be sure to enter the
switches in lower case.
Bug reports, comments to:
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#ifdef MSDOS
#include <fcntl.h> /* for setmode() call */
#endif
#ifdef CASESENSITIVE /* set to disable use of strnicmp */
#define strnicmp(a,b,len) strncmp(a,b,len)
#endif
/* JPEG marker codes */
#define TEM 0x01
#define SOF 0xc0
#define DHT 0xc4
#define JPGA 0xc8
#define DAC 0xcc
#define RST 0xd0
#define SOI 0xd8
#define EOI 0xd9
#define SOS 0xda
#define DQT 0xdb
#define DNL 0xdc
#define DRI 0xdd
#define DHP 0xde
#define EXP 0xdf
#define APP 0xe0
#define COM 0xfe
/* marker codes added by JPEG Part 3 extensions */
#define VER 0xf0
#define DTI 0xf1
#define DTT 0xf2
#define SRF 0xf3
#define SRS 0xf4
#define DCR 0xf5
#define DQS 0xf6
/* Sample quantization tables from JPEG spec --- only needed for
* guesstimate of quality factor. Note these are in zigzag order.
*/
static int std_luminance_quant_tbl[64] = {
16, 11, 12, 14, 12, 10, 16, 14,
13, 14, 18, 17, 16, 19, 24, 40,
26, 24, 22, 22, 24, 49, 35, 37,
29, 40, 58, 51, 61, 60, 57, 51,
56, 55, 64, 72, 92, 78, 64, 68,
87, 69, 55, 56, 80, 109, 81, 87,
95, 98, 103, 104, 103, 62, 77, 113,
121, 112, 100, 120, 92, 101, 103, 99
};
static int std_chrominance_quant_tbl[64] = {
17, 18, 18, 24, 21, 24, 47, 26,
26, 47, 99, 66, 56, 66, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99
};
static int *deftabs[2] =
{ std_luminance_quant_tbl, std_chrominance_quant_tbl };
/* jpeg_zigzag_order[i] is the zigzag-order position of the i'th element
* of a DCT block read in natural order (left to right, top to bottom).
*/
static int jpeg_zigzag_order[64] = {
0, 1, 5, 6, 14, 15, 27, 28,
2, 4, 7, 13, 16, 26, 29, 42,
3, 8, 12, 17, 25, 30, 41, 43,
9, 11, 18, 24, 31, 40, 44, 53,
10, 19, 23, 32, 39, 45, 52, 54,
20, 22, 33, 38, 46, 51, 55, 60,
21, 34, 37, 47, 50, 56, 59, 61,
35, 36, 48, 49, 57, 58, 62, 63
};
typedef enum {false, true} boolean;
/* switch table */
static struct opt {
char *string;
enum { helpO, quietO, verboseO, offsetO, continueO, noContinueO,
recurseO, noRecurseO, hexcharsO, nohexcharsO } id;
} options[] = {
{"?", helpO},
{"help", helpO},
{"quiet", quietO},
{"verbose", verboseO},
{"offset", offsetO},
{"continueaftereoi", continueO},
{"nocontinueaftereoi", noContinueO},
{"recurseintojpegthumbnails", recurseO},
{"norecurseintojpegthumbnails", noRecurseO},
{"hex", hexcharsO},
{"nohex", nohexcharsO}
};
static boolean recurseIntoThumbnails; /* state of recursion switch */
static boolean hexchars; /* state of hex-chars switch */
static long dumpMarkers(FILE *, char *, int, boolean, long);
static long dumpAPP0Marker(FILE *, char *, int, long, long);
static long dumpAPP8Marker(FILE *, char *, int, long, long, boolean *);
static long dumpAPP13Marker(FILE *, char *, int, long, long);
static unsigned int getWordMoto(FILE *);
static unsigned long getLongMoto(FILE *);
static void printChar (int);
static void printCharNoHex (int);
/* Main program: switch parsing */
int
main (int argc, char **argv)
{
FILE *inFile;
int numFileNames;
int i;
int verbosity;
boolean skipeoi;
long offset, j;
/* default switch settings */
offset=0L;
skipeoi=true;
verbosity=0;
recurseIntoThumbnails=false;
hexchars=false;
/* skip invocation name */
argc--;
argv++;
/* scan arguments */
numFileNames=0;
while (argc) {
if (**argv=='-'
#ifdef MSDOS
|| **argv=='/'
#endif
) {
/* Process a switch */
size_t length;
int selectedOption;
boolean multipleMatches;
length=strlen((*argv)+1);
selectedOption=-1;
multipleMatches=false;
for (i=0; i<sizeof(options)/sizeof(struct opt); i++) {
if (strnicmp((*argv)+1, options[i].string, length)==0) {
if (selectedOption>=0)
if (options[i].id!=options[selectedOption].id)
multipleMatches=true;
selectedOption=i;
if (length==strlen(options[i].string)) {
multipleMatches=false;
break;
}
}
}
if (selectedOption>=0 && !multipleMatches) {
switch(options[selectedOption].id) {
case helpO:
fprintf(stderr,
"usage: jpegdump [-help] [-q] [-v] [-o n] [-c] [-noc] [-r] [-nor] [-hex] [-nohex] [file1 [file2...]]\n");
exit(0);
break;
case quietO:
verbosity--;
break;
case verboseO:
verbosity++;
break;
case offsetO:
if (argc>1) {
argc--;
argv++;
offset=strtol(*argv, NULL, 0);
}
break;
case continueO:
skipeoi=true;
break;
case noContinueO:
skipeoi=false;
break;
case recurseO:
recurseIntoThumbnails=true;
break;
case noRecurseO:
recurseIntoThumbnails=false;
break;
case hexcharsO:
hexchars=true;
break;
case nohexcharsO:
hexchars=false;
break;
}
} else if (multipleMatches) {
fprintf(stderr, "ambiguous option %s\n", *argv);
exit(-1);
} else {
fprintf(stderr, "unrecognized option %s\n", *argv);
exit(-1);
}
} else {
/* not a switch, process input file with current switch settings */
numFileNames++;
inFile=fopen(*argv, "rb");
if (inFile==NULL) {
fprintf(stderr, "can't open file %s\n", *argv);
} else {
printf("\n%s:\n", *argv);
for (j=0L; j<offset; j++) /* skip specified offset */
getc(inFile);
dumpMarkers(inFile, "", verbosity, skipeoi, offset);
fclose(inFile);
}
}
argv++;
argc--;
}
/* Process standard input if no file names were found */
if (numFileNames==0) {
inFile=stdin;
#ifdef MSDOS
/* turn off newline translation */
setmode(fileno(inFile), O_BINARY);
#endif
for (j=0L; j<offset; j++) /* skip specified offset */
getc(inFile);
dumpMarkers(inFile, "", verbosity, skipeoi, offset);
}
return 0;
}
/* Standard JPEG markers (including Part 3 extensions, other than SPIFF) */
static long
dumpMarkers (FILE *stream, char *prefix, int verbosity,
boolean continueAfterEOI, long startingOffset)
{
int marker;
int c, c2, c3, c4, c5, i;
unsigned int height, aword, aword2, aword3, aword4;
unsigned long along, along2, along3, along4;
long length;
long totalBytesRead;
long extraneousBytes;
long markerBytes;
int expectingData, wasExpectingData;
int nextRSTexpected, thisRSTnum;
boolean inSPIFFDir;
char *str;
char *process;
totalBytesRead=0L;
extraneousBytes=0L;
expectingData=0; /* report extraneous data except after SOS */
nextRSTexpected = -1; /* no RST expected now */
inSPIFFDir = false;
while (1) {
c=getc(stream);
if (c==EOF)
break;
totalBytesRead++;
/* marker prefix? */
if (c!=0xff) {
extraneousBytes++;
continue;
}
/* get marker code, skipping fill bytes */
markerBytes=1L;
do {
c=getc(stream);
totalBytesRead++;
markerBytes++;
} while (c==0xff);
if (c==EOF) {
totalBytesRead--;
markerBytes--;
extraneousBytes += markerBytes;
break;
}
/* ignore stuffed FF/00 sequences */
if (c==0) {
extraneousBytes += markerBytes;
continue;
}
/* OK, we've apparently found a marker */
marker=c;
/* Gripe about extraneous data between markers */
if (extraneousBytes) {
if (!expectingData && verbosity>0)
printf("%s%ld extraneous bytes between markers\n", prefix, extraneousBytes);
extraneousBytes=0L;
}
/* Tell about padding FFs on a marker, too */
if (markerBytes != 2L && verbosity>0)
printf("%s%ld pad FFs before this marker:\n", prefix, markerBytes-2L);
/* Minimum verbosity to print marker is 0 for non-RST markers */
/* RSTs have special behavior, see their case */
if (verbosity>0 && (marker<RST+0 || marker>RST+7))
printf("%soffset $%lx ", prefix, totalBytesRead+startingOffset-2L);
wasExpectingData=expectingData;
expectingData=0; /* Reset for all except SOS and RST */
length=0L;
switch (marker) {
case SOI:
if (verbosity>0)
printf("SOI\n");
break;
case DRI:
length=(long) getWordMoto(stream);
aword = getWordMoto(stream);
if (verbosity>0) {
printf("DRI (length %ld)\n", length);
printf("%s restart interval %u MCUs\n", prefix, aword);
}
if (aword != 0)
nextRSTexpected = 0; /* expecting RSTs now */
else
nextRSTexpected = -1; /* not expecting any RSTs */
totalBytesRead+=4L;
length-=4L;
break;
case APP+0:
case APP+1:
case APP+2:
case APP+3:
case APP+4:
case APP+5:
case APP+6:
case APP+7:
case APP+8:
case APP+9:
case APP+10:
case APP+11:
case APP+12:
case APP+13:
case APP+14:
case APP+15:
length=(long) getWordMoto(stream);
if (verbosity>0)
printf("APP%d (length %ld)\n", marker-APP, length);
totalBytesRead+=2L;
length-=2L;
/* Handle some APP0 markers specially */
if (marker==APP+0) {
long bytes;
bytes=dumpAPP0Marker(stream, prefix, verbosity,
startingOffset+totalBytesRead, length);
totalBytesRead+=bytes;
length-=bytes;
} else if (marker==APP+8) {
long bytes;
bytes=dumpAPP8Marker(stream, prefix, verbosity,
startingOffset+totalBytesRead, length,
&inSPIFFDir);
totalBytesRead+=bytes;
length-=bytes;
} else if (marker==APP+13) {
long bytes;
bytes=dumpAPP13Marker(stream, prefix, verbosity,
startingOffset+totalBytesRead, length);
totalBytesRead+=bytes;
length-=bytes;
}
/* Print any remaining data in the APP marker */
if (length) {
if (verbosity>0)
printf("%s ", prefix);
while (length>0L) {
c = getc(stream);
if (verbosity>0)
printChar(c);
totalBytesRead++;
length--;
}
if (verbosity>0)
printf("\n");
}
break;
case COM:
length=(long) getWordMoto(stream);
if (verbosity>0)
printf("COM (length %ld)\n%s ", length, prefix);
totalBytesRead+=2L;
length-=2L;
while (length>0L) {
c = getc(stream);
if (verbosity>0)
printChar(c);
totalBytesRead++;
length--;
}
if (verbosity>0)
printf("\n");
break;
/* the following all have the same syntax and fall through to one parser */
case SOF+0:
str="SOF0"; process="Baseline";
goto frame;
case SOF+1:
str="SOF1"; process="Extended sequential";
goto frame;
case SOF+2:
str="SOF2"; process="Progressive";
goto frame;
case SOF+3:
str="SOF3"; process="Lossless";
goto frame;
case SOF+9:
str="SOF9"; process="Extended sequential arithmetic";
goto frame;
case SOF+10:
str="SOF10"; process="Progressive arithmetic";
goto frame;
case SOF+11:
str="SOF11"; process="Lossless arithmetic";
goto frame;
/* the following SOF markers are for differential coding;
they are listed on page B-2 of CD 10918-1, but for some
reason are not listed on B-6 and B-7, where the SOF syntax
is given. This suggests that the syntax may be different
for these markers, but it doesn't seem to be defined
anywhere else in the document. */
case SOF+5:
str="SOF5"; process="Differential sequential";
goto frame;
case SOF+6:
str="SOF6"; process="Differential progressive";
goto frame;
case SOF+7:
str="SOF7"; process="Differential lossless";
goto frame;
case SOF+13:
str="SOF13"; process="Differential sequential arithmetic";
goto frame;
case SOF+14:
str="SOF14"; process="Differential progressive arithmetic";
goto frame;
case SOF+15:
str="SOF15"; process="Differential lossless arithmetic";
goto frame;
case DHP:
str="DHP"; process="Hierarchical";
frame:
length=(long) getWordMoto(stream);
if (verbosity>0)
printf("%s (%s) (length %ld)\n", str, process, length);
totalBytesRead+=2L;
length-=2L;
c=getc(stream);
height=getWordMoto(stream);
aword=getWordMoto(stream);
c2=getc(stream);
totalBytesRead+=6L;
length-=6L;
if (verbosity>0) {
printf("%s sample precision %d width %u, height %u components %d\n",
prefix, c, aword, height, c2);
} else {
/* even very terse output includes process and dimensions */
printf("%s %s JPEG width %u, height %u components %d\n", prefix,
process, aword, height, c2);
}
while (c2--) {
c3=getc(stream);
c4=getc(stream);
c5=getc(stream);
totalBytesRead+=3L;
length-=3L;
if (verbosity>=0) /* terse output includes sampling factors */
printf("%s id %d horizontal sampling %d, vertical sampling %d, quantization table %d\n", prefix, c3, c4>>4, c4&0x0f, c5);
}
break;
case SOS:
length=(long) getWordMoto(stream);
if (verbosity>0)
printf("SOS (length %ld)\n", length);
totalBytesRead+=2L;
length-=2L;
c2=getc(stream);
totalBytesRead++;
length--;
if (verbosity>0)
printf("%s components %d\n", prefix, c2);
while (c2--) {
c3=getc(stream);
c4=getc(stream);
totalBytesRead+=2L;
length-=2L;
if (verbosity>0)
printf("%s id %d dc table %d, ac table %d\n", prefix,
c3, c4>>4, c4&0x0f);
}
c=getc(stream);
c2=getc(stream);
c3=getc(stream);
totalBytesRead+=3L;
length-=3L;
if (verbosity>0)
printf("%s Ss=%d, Se=%d, Ah=%d, Al=%d\n",
prefix, c, c2, c3>>4, c3&0x0f);
if (nextRSTexpected >= 0)
nextRSTexpected = 0; /* reset RST count to 0 if expecting RSTs */
expectingData=1; /* compressed data segment begins here */
break;
case DQT:
length=(long) getWordMoto(stream);
if (verbosity>0)
printf("DQT (length %ld)\n", length);
totalBytesRead+=2L;
length-=2L;
while (length>0L) {
int tableindex, coefindex, row, col;
unsigned int table[64];
int *reftable = NULL;
double cumsf = 0.0, cumsf2 = 0.0;
int allones = 1;
c=getc(stream);
totalBytesRead++;
length--;
tableindex = c & 0x0f;
if (verbosity>0)
printf("%s table %d precision %d\n", prefix, tableindex,
(c>>4) ? 16 : 8);
if (tableindex < 2)
reftable = deftabs[tableindex];
/* Read in the table, compute statistics relative to reference table */
for (coefindex = 0; coefindex < 64; coefindex++) {
unsigned int val;
if (c>>4) {
val=getWordMoto(stream);
totalBytesRead+=2L;
length-=2L;
} else {
val=(unsigned int) getc(stream);
totalBytesRead++;
length--;
}
table[coefindex] = val;
if (reftable) {
double x;
/* scaling factor in percent */
x = 100.0 * (double)val / (double)reftable[coefindex];
cumsf += x;
cumsf2 += x * x;
/* separate check for all-ones table (Q 100) */
if (val != 1) allones = 0;
}
}
/* If requested, print table in normal array order */
if (verbosity>1)
for (row=0; row<8; row++) {
printf("%s ", prefix);
for (col=0; col<8; col++) {
printf("%5u ", table[jpeg_zigzag_order[row*8+col]]);
}
printf("\n");
}
/* Print summary stats */
if (reftable && verbosity>=0) { /* terse output includes quality */
double qual, var;
cumsf /= 64.0; /* mean scale factor */
cumsf2 /= 64.0;
var = cumsf2 - (cumsf * cumsf); /* variance */
if (allones) /* special case for all-ones table */
qual = 100.0;
else if (cumsf <= 100.0)
qual = (200.0 - cumsf) / 2.0;
else
qual = 5000.0 / cumsf;
printf("%s Approximate quality factor for qtable %d: %.0f (scale %.2f, var %.2f)\n", prefix,
tableindex, qual, cumsf, var);
}
}
break;
case DHT:
length=(long) getWordMoto(stream);
if (verbosity>0)
printf("DHT (length %ld)\n", length);
totalBytesRead+=2L;
length-=2L;
while (length>0L) {
unsigned char numsymsoflen[16];
unsigned char symlength[256];
int duplicatecodes = 0;
c=getc(stream);
totalBytesRead++;
length--;
if (verbosity>0)
printf("%s table %d\n", prefix, c);
for (i=0; i<16; i++) {
numsymsoflen[i]=(unsigned char) getc(stream);
}
totalBytesRead+=16L;
length-=16L;
for (i=0; i<256; i++) {
symlength[i] = 0;
}
for (i=0; i<16; i++) {
if (verbosity>3)
printf("%s bits %2d (codes=%3u)", prefix, i+1,
(unsigned int) numsymsoflen[i]);
while (numsymsoflen[i]--) {
c2 = getc(stream);
totalBytesRead++;
length--;
if (symlength[c2])
duplicatecodes++;
symlength[c2] = i+1;
if (verbosity>3)
printf(" $%02x", c2);
}
if (verbosity>3)
printf("\n");
}
if (duplicatecodes && verbosity>0)
printf("%s %d symbols were assigned multiple codes!\n", prefix,
duplicatecodes);
if (verbosity>2) { /* produce the summary table */
int lastnz, cursym;
for (lastnz = 255; lastnz > 0; lastnz--) {
if (symlength[lastnz]) break;
}
printf("%s code lengths assigned to symbols:\n",
prefix);
printf("%s x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF\n",
prefix);
for (cursym = 0; cursym <= lastnz; cursym += 16) {
printf("%s %Xx ", prefix, cursym >> 4);
for (i=0; i<16; i++) {
if (symlength[cursym+i])
printf("%3d", symlength[cursym+i]);
else
printf(" ");
}
printf("\n");
}
}
}
break;
case DAC:
length=(long) getWordMoto(stream);
if (verbosity>0)
printf("DAC (length %ld)\n", length);
totalBytesRead+=2L;
length-=2L;
while (length>0L) {
c=getc(stream);
c2=getc(stream);
totalBytesRead+=2L;
length-=2L;
if (verbosity>0)
printf("%s id %d conditioning %d\n", prefix, c, c2);
}
break;
case RST+0:
case RST+1:
case RST+2:
case RST+3:
case RST+4:
case RST+5:
case RST+6:
case RST+7:
thisRSTnum = marker - RST;
/* RSTs are normally printed at verbosity 5, but an RST occurring
* outside any compressed data segment will be shown at verbosity 1,
* as will an out-of-sequence RST.
*/
if (verbosity>0) {
if (verbosity>4 || !wasExpectingData || thisRSTnum!=nextRSTexpected) {
printf("%soffset $%lx ", prefix, totalBytesRead+startingOffset-2L);
printf("RST%d", thisRSTnum);
if (thisRSTnum != nextRSTexpected) {
if (wasExpectingData && nextRSTexpected >= 0)
printf(" Out-of-sequence: RST%d expected", nextRSTexpected);
else
printf(" No RSTn expected here");
}
printf("\n");
}
}
nextRSTexpected = (thisRSTnum+1) & 7;
expectingData=1; /* compressed data segment continues */
break;
case DNL:
length=(long) getWordMoto(stream);
aword = getWordMoto(stream);
if (verbosity>0) {
printf("DNL (length %ld)\n", length);
printf("%s lines %u\n", prefix, aword);
}
totalBytesRead+=4L;
length-=4L;
break;
case EOI:
if (verbosity>0)
printf("EOI\n");
break;
case EXP:
length=(long) getWordMoto(stream);
if (verbosity>0)
printf("DHP (length %ld)\n", length);
c=getc(stream);
if (verbosity>0)
printf("%s horizontal expansion %d, vertical expansion %d\n", prefix,
c>>4, c&0x0f);
totalBytesRead+=3L;
length-=3L;
break;
case TEM:
if (verbosity>0)
printf("TEM\n");
break;
/* JPEG Part 3 extension markers */
case VER:
length=(long) getWordMoto(stream);
if (verbosity>0)
printf("VER (length %ld)\n", length);
c=getc(stream);
c2=getc(stream);
totalBytesRead+=4L;
length-=4L;
if (verbosity>0)
printf("%s version %d.%d capabilities:", prefix, c, c2);
while (length>0L) {
c=getc(stream);
totalBytesRead++;
length--;
if (verbosity>0)
printf(" $%02x", c);
}
if (verbosity>0)
printf("\n");
break;
case SRF:
length=(long) getWordMoto(stream);
aword = getWordMoto(stream);
aword2 = getWordMoto(stream);
if (verbosity>0) {
printf("SRF (length %ld)\n", length);
printf("%s vertical offset %u, horizontal offset %u\n", prefix,
aword, aword2);
}
totalBytesRead+=6L;
length-=6L;
break;
case SRS:
length=(long) getWordMoto(stream);
aword = getWordMoto(stream);
aword2 = getWordMoto(stream);
aword3 = getWordMoto(stream);
aword4 = getWordMoto(stream);
if (verbosity>0) {
printf("SRS (length %ld)\n", length);
printf("%s vertical offset %u, horizontal offset %u\n", prefix,
aword, aword2);
printf("%s vertical size %u, horizontal size %u\n", prefix,
aword3, aword4);
}
totalBytesRead+=10L;
length-=10L;
break;
case DTI:
length=(long) getWordMoto(stream);
c=getc(stream);
aword = getWordMoto(stream);
aword2 = getWordMoto(stream);
along = getLongMoto(stream);
along2 = getLongMoto(stream);
if (verbosity>0) {
printf("DTI (length %ld)\n", length);
printf("%s tiling type %d, vertical scale %u, horizontal scale %u\n",
prefix, (int) c, aword, aword2);
printf("%s reference grid height %lu, width %lu\n",
prefix, along, along2);
}
totalBytesRead+=15L;
length-=15L;
break;
case DTT:
length=(long) getWordMoto(stream);
along = getLongMoto(stream);
along2 = getLongMoto(stream);
along3 = getLongMoto(stream);
along4 = getLongMoto(stream);
if (verbosity>0) {
printf("DTT (length %ld)\n", length);
printf("%s vertical scale %lu, horizontal scale %lu\n",
prefix, along, along2);
printf("%s vertical offset %lu, horizontal offset %lu\n",
prefix, along3, along4);
}
totalBytesRead+=18L;
length-=18L;
break;
case DCR:
length=(long) getWordMoto(stream);
c=getc(stream);
c2=getc(stream);
if (verbosity>0) {
printf("DCR (length %ld)\n", length);
printf("%s component %d: vertical offset %d, horizontal offset %d\n",
prefix, (int) c, c2>>4, c2&0x0f);
}
totalBytesRead+=4L;
length-=4L;
break;
case DQS:
length=(long) getWordMoto(stream);
c=getc(stream);
if (verbosity>0) {
printf("DQS (length %ld)\n", length);
printf("%s Tc %d\n", prefix, (int) c);
}
totalBytesRead+=3L;
length-=3L;
break;
default:
length=(long) getWordMoto(stream);
if (verbosity>0)
printf("marker $%02x (length %ld)\n", marker, length);
totalBytesRead+=2L;
length-=2L;
if (verbosity>0)
printf("%s ", prefix);
while (length>0L) {
c=getc(stream);
totalBytesRead++;
length--;
if (verbosity>0)
printChar(c);
}
if (verbosity>0)
printf("\n");
break;
} /* end switch (marker) */
if (length && verbosity>0)
printf("%s bad length (residual=%ld)\n", prefix, length);
if (marker==EOI && !continueAfterEOI)
break;
} /* end while */
/* Gripe about extraneous data after last marker */
if (extraneousBytes && verbosity>0) {
printf("%s%ld extraneous bytes after last marker\n", prefix,
extraneousBytes);
}
return totalBytesRead;
}
/* JFIF-defined APPn markers */
static long
dumpAPP0Marker (FILE *stream, char *prefix, int verbosity,
long startingOffset, long length)
{
/* Note passed length is bytes *remaining* after the length word;
* also, startingOffset points to byte after length word.
* Return the number of bytes consumed; anything remaining in the APP
* marker will be printed by dumpMarkers.
*/
long totalBytesRead = 0L;
char signature[5];
int i;
if (length>=5L) {
for (i=0; i<5; i++)
signature[i] = getc(stream);
totalBytesRead+=5L;
length-=5L;
if (memcmp(signature, "JFIF", 5)==0 && length>=9L) {
unsigned int jfifversion, dpiX, dpiY, thumbX, thumbY;