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process.c
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process.c
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/* =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- */
/* =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- */
/* EXIFPROBE - TIFF/JPEG/EXIF image file probe */
/* =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- */
/* Copyright (C) 2002, 2005 by Duane H. Hesser. All rights reserved. */
/* */
/* See the file LICENSE.EXIFPROBE for terms of use. */
/* =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- */
#ifndef lint
static char *ModuleId = "@(#) $Id: process.c,v 1.47 2005/07/25 22:05:10 alex Exp $";
#endif
/* Process segment types such as TIFF IFD, JPEG APP segments, and */
/* JPEG basic segments. */
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <ctype.h>
#include "defs.h"
#include "summary.h"
#include "maker.h"
#include "datadefs.h"
#include "misc.h"
#include "tags.h"
#include "extern.h"
#include "ciff.h"
/* Read and decode a TIFF IFD, attempting to describe the location */
/* and structure of the data as it is read. Entry values which live */
/* at an offset from the entry are displayed following the last entry */
/* in the IFD (actually after the "next ifd offset") if */
/* VALUE_AT_OFFSET is set in Print_options, so that most IFDS will */
/* have a VALUES section following the entry lines, in just the */
/* manner that the file is laid out by spec. Tag names for offset */
/* values are repeated when the value is printed. If VALUE_AT_OFFSET */
/* is not set, the value is printed immediately, unless the tag */
/* represents a subsection, in which case the offset of the */
/* subsection is printed as the tag value, and the subsection handled */
/* in a second pass, after all entries are done. */
/* Returns a file offset which represents the "highest" position of */
/* the file pointer read by this routine and its subroutines, which */
/* may be used by the caller to read the remainder of the file. This */
/* number (less one) is printed as the offset of the end of the IFD. */
/* At the same time, the function notices non-zero values of "next */
/* ifd offset" which may be contained in this ifd, and passes it as */
/* "max_offset" to routines which read subifds, on the assumption */
/* that this ifd should not write into the next ifd. That value is */
/* used to mark segments which appear to be out of order in the file. */
/* If the routine detects by this means that *this* ifd is outside */
/* its natural bounds, and cannot be contained within its parent, it */
/* returns 0, rather than the maximum value offset, so that the */
/* parent routine will not improperly alter its maximum offset. */
/* The arguments are the byteorder to be used when reading integer */
/* data (usually taken from the TIFF header), the offset of the start */
/* of the directory, relative to the TIFF header, the offset of the */
/* TIFF header from the beginning of the file, the sequence number of */
/* the IFD, and formatting values (indent and address width) to be */
/* used when printing. */
/* The routine also attempts to record the location, size, image type */
/* and compression method used for actual image data contained within */
/* or referenced by a tiff IFD. This information is printed at the */
/* end, as a summary of images found in the file. */
unsigned long
process_tiff_ifd(FILE *inptr,unsigned short byteorder,unsigned long ifd_offset,
unsigned long fileoffset_base,unsigned long max_offset,
struct image_summary *summary_entry,char *parent_name,
int ifdtype,int ifdnum,int subifdnum,int indent)
{
struct ifd_entry *entry_ptr = NULL;
struct image_summary *tmp_summary_entry;
unsigned long cur_ifd_offset,next_ifd_offset,current_offset;
unsigned long start_entry_offset,entry_offset,value_offset;
unsigned long value_start_offset = 0UL;
unsigned long offset_limit = 0UL;
unsigned long max_value_offset = 0UL;
unsigned long max_ifd_offset = 0UL;
unsigned long thn_offset = 0UL; /* JPegInterchangeFormat */
unsigned long thn_length = 0UL; /* JpegInterChangeFormat */
unsigned long tmp_length = 0L;
unsigned long alt_length = 0L;
unsigned long limit_offset = 0L;
unsigned long filesize = 0UL;
unsigned short marker,alt_byteorder = 0;
int invalid_entry = 0;
int value_is_offset = 0;
int use_second_pass = 0;
int status = 0;
int chpr = 0;
int entry_num,num_entries,i;
char dirnamebuf[16];
char *ifdname,*prefix,*dirname,*nameoftag,*tprefix;
char *fulldirname = CNULL;
char *listname = CNULL;
if(inptr == (FILE *)0)
{
fprintf(stderr,"%s: no open file pointer to read TIFF IFD\n",
Progname);
return(0L);
}
if(Debug & OUT_DEBUG)
{
printf("PS=%d,",(Print_options & PRINT_SECTION) > 0);
printf("PV=%d,",(Print_options & PRINT_VALUE) > 0);
printf("PO=%d,",(Print_options & PRINT_OFFSET) > 0);
printf("PVAO=%d\n",(Print_options & PRINT_VALUE_AT_OFFSET) > 0);
}
filesize = get_filesize(inptr);
next_ifd_offset = ifd_offset + fileoffset_base;
while(next_ifd_offset)
{
clearerr(inptr);
/* max_offset, if set, is the maximum offset which the parent */
/* is willing to claim. max_ifd_offset is the maximum offset */
/* reached by this ifd, which may be constrained by the */
/* "next_ifd_offset" of chained ifds. */
cur_ifd_offset = next_ifd_offset;
if(max_offset && (cur_ifd_offset > max_offset))
prefix = ">"; /* outside the parent */
else
prefix = "@";
print_tag_address(SECTION,cur_ifd_offset,indent,prefix);
switch(ifdtype)
{
case TIFF_IFD:
if(PRINT_SECTION)
chpr += printf("<IFD %d>",ifdnum);
ifdname = "IFD";
sprintf(dirnamebuf,"Ifd%d",ifdnum);
dirname = dirnamebuf;
break;
case TIFF_SUBIFD:
if(PRINT_SECTION)
chpr += printf("<SubIFD %d of IFD %d>",subifdnum,ifdnum);
ifdname = "SubIFD";
sprintf(dirnamebuf,"SubIfd%d",subifdnum);
dirname = dirnamebuf;
break;
case INTEROP_IFD:
if(PRINT_SECTION)
chpr += printf("<Interoperability SubIFD>");
ifdname = "Interoperability SubIFD";
dirname = "Interop";
break;
case GPS_IFD:
if(PRINT_SECTION)
chpr += printf("<GPS SubIFD>");
ifdname = "GPS SubIFD";
dirname = "Gps";
break;
case EXIF_IFD: /* This shouldn't happen */
if(PRINT_SECTION)
chpr += printf("<EXIF IFD>");
ifdname = "EXIF IFD";
dirname = "Exif";
break;
case MAKER_SUBIFD:
ifdname = "MakerNote SubIFD";
if(PRINT_SECTION)
chpr += printf("<%s>",ifdname);
dirname = CNULL;
break;
default:
if(PRINT_SECTION)
chpr += printf("<UNKNOWN IFD TYPE %d>",ifdtype); /* SECTION */
ifdname = "UNKNOWN IFD TYPE";
dirname = CNULL;
break;
}
if(dirname)
listname = fulldirname = splice(parent_name,".",dirname);
else
listname = parent_name;
num_entries = read_ushort(inptr,byteorder,cur_ifd_offset);
max_value_offset = max_ifd_offset = 0L;
if(ferror(inptr) || feof(inptr))
{
chpr = newline(chpr);
printred("#========= WARNING: FAILED to read number of entries for IFD at offset ");
chpr += printf("%lu",cur_ifd_offset);
if(ferror(inptr))
why(stdout);
chpr = newline(chpr);
goto blewit;
}
/* The file pointer is now at the start of the IFD entries */
current_offset = entry_offset = start_entry_offset = ftell(inptr);
if(PRINT_SECTION)
{
chpr += printf(" %d entries ",num_entries);
chpr += printf("starting at file offset %#lx=%lu",
start_entry_offset,start_entry_offset);
chpr = newline(chpr);
}
if((summary_entry == NULL) || summary_entry->entry_lock)
summary_entry = new_summary_entry(summary_entry,0,ifdtype);
else
summary_entry = last_summary_entry(summary_entry);
if(summary_entry)
{
summary_entry->datatype = ifdtype;
summary_entry->imageformat = IMGFMT_NOIMAGE;
summary_entry->filesubformat |= FILESUBFMT_TIFF;
if((ifdtype == TIFF_IFD) || (ifdtype == TIFF_SUBIFD) || (ifdtype == MAKER_SUBIFD))
{
summary_entry->ifdnum = ifdnum;
summary_entry->subifdnum = subifdnum;
}
}
use_second_pass = value_is_offset = 0;
indent += SMALLINDENT;
for(entry_num = 0; entry_num < num_entries; ++entry_num)
{
entry_ptr = read_ifd_entry(inptr,byteorder,entry_offset);
if((entry_ptr->value_type == 0) || (entry_ptr->value_type > DOUBLE) ||
ferror(inptr) || feof(inptr))
{
print_tag_address(ENTRY,entry_offset,indent,prefix);
print_taginfo(entry_ptr,listname,SMALLINDENT,ifdtype,ifdnum,subifdnum);
if((PRINT_ENTRY))
printred(" INVALID ENTRY");
chpr = newline(chpr);
/* If there are a few invalid entries in an otherwise */
/* valid IFD, the invalid entries should be reported. */
/* An invalid IFD, with 50,000 entries or so, all */
/* invalid, should be nipped in the bud. */
clearerr(inptr);
current_offset = ftell(inptr);
if(max_offset > 0)
limit_offset = max_offset;
else
{
if(fseek(inptr,0L,SEEK_END) != -1)
{
limit_offset = ftell(inptr);
fseek(inptr,current_offset,SEEK_SET);
}
}
/* If there's an error on input, or we can't check */
/* for absurd num_entries, give up. */
if(!ferror(inptr) && !feof(inptr) && (limit_offset > 0))
{
/* If the number of entries would read past the */
/* size of the IFD, or past EOF, give up */
if((ifd_offset + (12 * num_entries)) < limit_offset)
{
/* Limit the number of consecutive failures. */
/* An apparently valid entry resets the count */
/* to 0. */
if(invalid_entry++ < MAX_INVALID_ENTRIES)
{
entry_offset = current_offset;
clearerr(inptr);
continue;
}
}
}
chpr = newline(chpr);
goto blewit;
}
invalid_entry = 0;
current_offset = ftell(inptr);
switch(entry_ptr->tag)
{
case TIFFTAG_OldSubFileType: /* old, deprecated */
if(summary_entry)
{
summary_entry->filesubformat |= FILESUBFMT_TIFFEP;
if(entry_ptr->value == 1)
summary_entry->subfiletype = PRIMARY_TYPE;
else if(entry_ptr->value == 2)
summary_entry->subfiletype = REDUCED_RES_TYPE;
else if(entry_ptr->value == 3)
summary_entry->subfiletype = PAGE_TYPE;
}
break;
case TIFFTAG_NewSubFileType:
if(summary_entry)
{
summary_entry->filesubformat |= FILESUBFMT_TIFFEP;
if(entry_ptr->value == 0)
summary_entry->subfiletype = PRIMARY_TYPE;
else if(entry_ptr->value == 1)
summary_entry->subfiletype = REDUCED_RES_TYPE;
else if(entry_ptr->value == 2)
summary_entry->subfiletype = PAGE_TYPE;
else if(entry_ptr->value == 3)
summary_entry->subfiletype = MASK_TYPE;
}
break;
case INTEROPTAG_RelatedImageWidth: /* ###%%% ??? */
case TIFFTAG_ImageWidth:
if(summary_entry)
summary_entry->pixel_width = entry_ptr->value;
break;
case INTEROPTAG_RelatedImageLength: /* ###%%% ??? */
case TIFFTAG_ImageLength:
if(summary_entry)
summary_entry->pixel_height = entry_ptr->value;
break;
case TIFFTAG_Compression:
if(summary_entry)
{
summary_entry->compression = entry_ptr->value;
if((entry_ptr->value == 7) || (entry_ptr->value == 6))
{
if(entry_ptr->value == 6)
summary_entry->filesubformat |= FILESUBFMT_TIFFOLD;
/* Some of this may have to be undone */
/* later, if we find out they lied */
summary_entry->entry_lock = lock_number(summary_entry);
if(summary_entry->imageformat == 0)
summary_entry->imageformat = IMGFMT_JPEG;
}
else
{
summary_entry->entry_lock = lock_number(summary_entry);
if(summary_entry->imageformat == 0)
summary_entry->imageformat = IMGFMT_TIFF;
if(summary_entry->compression == 34713)
summary_entry->filesubformat |= FILESUBFMT_NEF;
/* If there is no subfiletype tag, this */
/* could be the primary, or it could be a */
/* thumbnail */
if(summary_entry->subfiletype <= POSSIBLE_PRIMARY_TYPE)
summary_entry->subfiletype = POSSIBLE_PRIMARY_TYPE;
}
}
break;
case TIFFTAG_PhotometricInterpretation:
/* It appears that the PMI values used in Olympus */
/* ORF files (1 or 2 for the primary image) do */
/* not correspond to legitimate TIFF PMI values. */
/* Record them "as is" here, but they shouldn't */
/* be *interpreted* in the same way as TIFF files */
if(summary_entry)
summary_entry->imagesubformat = entry_ptr->value | IMGSUBFMT_VALUE_IS_PMI;
break;
case TIFFTAG_JPEGInterchangeFormat:
/* actually an offset... */
/* This method of JPEG-in-TIFF is discouraged by */
/* the TIFF spec (after Technote 2), for good and */
/* sufficient reason> */
thn_offset = entry_ptr->value + fileoffset_base;
break;
case TIFFTAG_JPEGInterchangeFormatLength:
thn_length = entry_ptr->value;
break;
case TIFFTAG_StripOffsets:
case TIFFTAG_TileOffsets:
/* If there are multiple strips, this will be */
/* wrong, but will be overwritten in the second */
/* pass. */
if(summary_entry)
{
summary_entry->offset = entry_ptr->value;
if((summary_entry->compression != 6) &&
(summary_entry->compression != 7))
{
summary_entry->entry_lock = lock_number(summary_entry);
}
}
break;
case TIFFTAG_StripByteCounts:
case TIFFTAG_TileByteCounts:
/* This may also be overwritten in the second */
/* pass */
if(summary_entry)
{
summary_entry->length = entry_ptr->value;
if((summary_entry->compression != 6) &&
(summary_entry->compression != 7))
{
summary_entry->entry_lock = lock_number(summary_entry);
}
}
break;
case TIFFEPTAG_TIFF_EPStandardID:
if(summary_entry)
summary_entry->filesubformat |= FILESUBFMT_TIFFEP;
break;
case TIFFTAG_Make:
case TIFFTAG_Model:
case TIFFTAG_Software:
{
char *makename,*modelname,*swname;
/* These items will be read and printed in */
/* the second pass, if one is made. This */
/* grabs them and records them in globals, */
/* which may be used later by the makernote */
/* code. */
switch(entry_ptr->tag)
{
case TIFFTAG_Make:
if(Make_name == NULL)
{
Make_name = strdup_value(entry_ptr,
inptr,
fileoffset_base);
}
break;
case TIFFTAG_Model:
if(Model_name == NULL)
{
Model_name = strdup_value(entry_ptr,
inptr,
fileoffset_base);
}
break;
case TIFFTAG_Software:
if(Software_name == NULL)
{
Software_name = strdup_value(entry_ptr,
inptr,
fileoffset_base);
}
break;
}
}
break;
case TIFFTAG_BitsPerSample:
if(summary_entry)
{
/* Do not override information from */
/* earlier sections; the tiff section in */
/* e.g. MRW sections can lie if the image */
/* has been improperly handled by */
/* other-party software. */
if(summary_entry->bps[0] == 0)
{
if(entry_ptr->count < 3)
{
summary_entry->bps[0] = (unsigned short)entry_ptr->value & 0xffff;
if(entry_ptr->count == 2)
summary_entry->bps[1] =
(unsigned short)((entry_ptr->value & 0xffff0000) >> 16);
}
else
{
summary_entry->bps[0] = read_ushort(inptr,byteorder,entry_ptr->value);
for(i = 1; (i < entry_ptr->count) && (i < MAXSAMPLE); ++i)
summary_entry->bps[i] = read_ushort(inptr,byteorder,HERE);
}
}
}
break;
case TIFFTAG_SamplesPerPixel:
if((summary_entry) && (summary_entry->spp == 0))
summary_entry->spp = entry_ptr->value;
break;
case DNGTAG_DNGVersion: /* A DNG-specific tag */
if(summary_entry)
summary_entry->filesubformat |= FILESUBFMT_DNG;
break;
case TIFFTAG_CR2_0xc5d9: /* A CR2-specific tag */
if(summary_entry)
{
summary_entry->filesubformat |= FILESUBFMT_CR2;
if((summary_entry->compression == 6) &&
(summary_entry->imagesubformat == IMGSUBFMT_RGB))
{
summary_entry->subfiletype = REDUCED_RES_TYPE;
}
}
break;
case TIFFTAG_CR2_0xc5d8:
case TIFFTAG_CR2_0xc5e0:
case TIFFTAG_CR2_SLICE:
/* These tags appear (so far) only in the */
/* weird IFD containing the lossless jpeg */
/* primary. It is possible to check for other */
/* things, e.g. just compression, strip */
/* offset and bytecount (1 each), but for now */
/* just assume that any of these tags means */
/* CR2. The compression at this point will be */
/* 6, but will be re-marked JPEG_SOF_3 when */
/* the image is scanned. */
if(summary_entry)
{
summary_entry->filesubformat |= FILESUBFMT_CR2;
summary_entry->subfiletype = PRIMARY_TYPE;
}
break;
case TIFFTAG_SubIFDtag:
case EXIFTAG_ExifIFDPointer:
case EXIFTAG_GPSInfoIFDPointer:
case EXIFTAG_Interoperability:
case TIFFTAG_PrintIM:
use_second_pass++;
break;
default:
break;
}
print_tag_address(ENTRY,entry_offset,indent,prefix);
value_offset = print_entry(inptr,byteorder,entry_ptr,fileoffset_base,
summary_entry,listname,ifdtype,
ifdnum, subifdnum, SMALLINDENT);
/* Keep track of how far into the file reading progresses */
if(value_offset == 0UL)
value_offset = current_offset;
if(value_offset > max_value_offset)
max_value_offset = value_offset;
if((is_offset(entry_ptr)))
++use_second_pass;
entry_offset = current_offset;
}
next_ifd_offset = read_ulong(inptr,byteorder,current_offset);
if(next_ifd_offset > 0UL)
{
if((PRINT_VALUE) && (PRINT_SECTION) && (PRINT_VALUE_AT_OFFSET))
{
print_tag_address(SECTION,current_offset,indent,prefix);
chpr += printf("**** next IFD offset %lu",next_ifd_offset);
next_ifd_offset += fileoffset_base;
chpr += printf("(+ %lu = %#lx/%lu)",fileoffset_base,
next_ifd_offset,next_ifd_offset);
}
else
next_ifd_offset += fileoffset_base;
/* Corrupt file will cause infinite loops. So we abort.
* It is possible this can be worked around better.
* See Issue #9 https://github.com/hfiguiere/exifprobe/issues/9
*/
if(next_ifd_offset < ftell(inptr)) {
printred("\nReading IFD backwards. INVALID FILE. ABORTING.\n");
exit(1);
} else if (next_ifd_offset > filesize) {
printred("\nReading IFD past EOF. INVALID FILE. ABORTING.\n");
exit(1);
}
/* We should be able to tolerate these */
if ((ifdtype != TIFF_IFD) && (ifdtype != TIFF_SUBIFD))
{
if(PRINT_SECTION)
printred(" INVALID NEXT IFD OFFSET ");
else
{
chpr = newline(chpr);
printred("# ========= WARNING: INVALID NEXT IFD OFFSET ");
chpr += printf("%ld in ",next_ifd_offset);
/* Until someone creates a subifd in a subifd, */
/* this is enough. */
if(ifdtype == TIFF_IFD)
chpr += printf("IFD %d =========",ifdnum);
else if(ifdtype == TIFF_SUBIFD)
chpr += printf("SUBIFD %d of IFD %d =========",subifdnum,ifdnum);
else
chpr += printf("%s =========",ifdname);
}
next_ifd_offset = 0L;
}
/* This is the limit of offsets which should be part of */
/* this ifd; a limit may have been passed in from the */
/* parent, if it had a length of this section. This will */
/* replace that number unconditionally, although it may */
/* be that one should be checked against the other... */
/* This can be checked against max_value_offset, and */
/* value_offset in the second pass. */
max_offset = next_ifd_offset;
chpr = newline(chpr);
}
else
{
if((PRINT_VALUE) && (PRINT_SECTION) && (PRINT_VALUE_AT_OFFSET))
{
print_tag_address(SECTION,current_offset,indent,prefix);
chpr += printf("**** next IFD offset 0");
chpr = newline(chpr);
}
}
if(max_value_offset < current_offset)
max_ifd_offset = current_offset;
else
max_ifd_offset = max_value_offset;
if(Debug & END_OF_SECTION_DEBUG)
printf("mo=%lu, mvo=%lu, mio=%lu, nio=%lu, ol=%lu\n",max_offset,max_value_offset,max_ifd_offset,next_ifd_offset,offset_limit);
/* If we made it through the first pass, we should be able to */
/* get some info from the second pass, so don't let a failure */
/* here stop us. It will fail later. */
if(ferror(inptr) || feof(inptr))
{
chpr += printf("#========= WARNING: READ NEXT IFD OFFSET FAILED =========");
chpr = newline(chpr);
why(stdout);
clearerr(inptr); /* keep going... */
}
else
current_offset = ftell(inptr);
value_offset = current_offset;
if(use_second_pass)
{
if((PRINT_VALUE) && (PRINT_SECTION) && (PRINT_VALUE_AT_OFFSET))
{
print_tag_address(SECTION,value_offset,indent,prefix);
chpr += printf("============= VALUES, ");
if(ifdtype == TIFF_IFD)
chpr += printf("IFD %d",ifdnum);
else if(ifdtype == TIFF_SUBIFD)
chpr += printf("SubIFD %d of IFD %d",subifdnum,ifdnum);
else if(ifdtype == INTEROP_IFD)
chpr += printf("Interoperability SubIFD");
else if(ifdtype == EXIF_IFD) /* shouldn't happen */
chpr += printf("EXIF IFD");
else if(ifdtype == MAKER_SUBIFD)
chpr += printf("%s",ifdname);
else
chpr += printf("UNKNOWN IFD TYPE %d",ifdtype);
chpr += printf(" ============");
chpr = newline(chpr);
}
/* Second pass, to evaluate entries which are stored */
/* indirectly (the value requires more than 4 bytes). */
/* This time we have to explicitly seek to each entry, */
/* since the value processing may send the file pointer */
/* off to exotic places. */
entry_offset = start_entry_offset;
for(entry_num = 0; entry_num < num_entries; ++entry_num)
{
entry_ptr = read_ifd_entry(inptr,byteorder,entry_offset);
if((entry_ptr->value_type == 0) || (entry_ptr->value_type > DOUBLE) ||
ferror(inptr) || feof(inptr))
{
/* If the first pass made it through invalid */
/* entries, this pass should just ignore them and */
/* quietly continue. */
clearerr(inptr);
entry_offset = current_offset = ftell(inptr);
continue;
}
entry_offset = current_offset = ftell(inptr);
value_is_offset = is_offset(entry_ptr);
switch(entry_ptr->tag)
{
case TIFFTAG_SubIFDtag:
value_offset = process_subifd(inptr,byteorder,
entry_ptr, fileoffset_base,0L,
summary_entry,listname,
ifdnum,++subifdnum,TIFF_SUBIFD,
indent);
/* subifds are not part of the IFD; throw */
/* away this value for now. */
value_offset = 0;
break;
case EXIFTAG_ExifIFDPointer:
value_start_offset = entry_ptr->value + fileoffset_base;
value_offset = process_exif_ifd(inptr,byteorder,
entry_ptr->value,fileoffset_base,
next_ifd_offset,summary_entry,listname,
ifdnum,indent);
if(max_offset && (value_offset > max_offset))
offset_limit = value_offset;
break;
case EXIFTAG_GPSInfoIFDPointer:
value_offset = process_gps_ifd(inptr,byteorder,
entry_ptr->value,fileoffset_base,
next_ifd_offset,summary_entry,listname,
ifdnum,indent);
break;
case EXIFTAG_Interoperability:
/* This doesn't belong in a TIFF IFD, but */
/* be prepared. */
/* Also we make sure we are not calling on */
/* the same ifd offset */
PUSHCOLOR(INTEROP_COLOR);
if (entry_ptr->value != ifd_offset) {
value_offset = process_tiff_ifd(inptr,byteorder,
entry_ptr->value,fileoffset_base,
next_ifd_offset,summary_entry,
listname,INTEROP_IFD,ifdnum,0,
indent);
}
value_offset = 0;
POPCOLOR();
break;
case TIFFTAG_StripOffsets:
case TIFFTAG_TileOffsets:
/* Update the summary values set in the first */
/* pass */
/* Bad strip offsets seem to be one of the */
/* more common errors, especially when images */
/* have been processed by editing software. */
/* Offsets greater than filesize are easy to */
/* detect, so check for them, and test to see */
/* if they're just written with the wrong */
/* byteorder. */
/* ###%%% need to record number of offsets */
/* and location of offsets for multi-tile */
/* (multi-strip?) images jpeg-compressed by */
/* tile (seen in DNG) */
if((value_is_offset) && summary_entry)
{
alt_byteorder = byteorder;
summary_entry->chunkhow = entry_ptr->tag;
summary_entry->chunktype = entry_ptr->value_type;
/* ###%%% combine short and long cases; just switch read_xxx() */
if(entry_ptr->value_type == LONG)
{
unsigned long tmp_offset;
tmp_offset = read_ulong(inptr,byteorder,entry_ptr->value + fileoffset_base);
summary_entry->offset = tmp_offset;
summary_entry->offset_loc = entry_ptr->value +fileoffset_base;
summary_entry->noffsets = entry_ptr->count;
if(tmp_offset > filesize)
{
chpr = newline(chpr);
PUSHCOLOR(HI_RED);
print_filename();
chpr += printf("# WARNING: initial stripoffset (%#lx/%lu) > filesize...wrong byteorder? ",
tmp_offset,tmp_offset);
print_byteorder(byteorder,1);
chpr = newline(chpr);
if(byteorder == TIFF_MOTOROLA)
alt_byteorder = TIFF_INTEL;
else
alt_byteorder = TIFF_MOTOROLA;
tmp_offset = read_ulong(inptr,alt_byteorder,
entry_ptr->value + fileoffset_base);
print_filename();
chpr += printf("# WARNING: initial stripoffset using alt byteorder [");
print_byteorder(alt_byteorder,1);
chpr += printf("] is %#lx/%lu ",
tmp_offset,tmp_offset);
chpr = newline(chpr);
if(tmp_offset < filesize)
summary_entry->offset = tmp_offset;
POPCOLOR();
}
}
else
{
unsigned short tmp_offset;
tmp_offset = read_ushort(inptr,byteorder,entry_ptr->value + fileoffset_base);
summary_entry->offset = tmp_offset;
summary_entry->offset_loc = entry_ptr->value +fileoffset_base;
summary_entry->noffsets = entry_ptr->count;
if((unsigned long)tmp_offset > filesize)
{
chpr = newline(chpr);
PUSHCOLOR(HI_RED);
print_filename();
chpr += printf("# WARNING: initial stripoffset (%#x/%u) > filesize...wrong byteorder? ",
tmp_offset,tmp_offset);
print_byteorder(byteorder,1);
chpr = newline(chpr);
if(byteorder == TIFF_MOTOROLA)
alt_byteorder = TIFF_INTEL;
else
alt_byteorder = TIFF_MOTOROLA;
tmp_offset = read_ushort(inptr,alt_byteorder,
entry_ptr->value + fileoffset_base);
print_filename();
chpr += printf("# WARNING: initial stripoffset using alt byteorder [");
print_byteorder(alt_byteorder,1);
chpr += printf("] is %#x/%u ",
tmp_offset,tmp_offset);
chpr = newline(chpr);
if(tmp_offset < filesize)
summary_entry->offset = tmp_offset;
POPCOLOR();
}
}
}
if((PRINT_VALUE) && ((PRINT_VALUE_AT_OFFSET) && value_is_offset))
{
print_tag_address(ENTRY,fileoffset_base + entry_ptr->value,
indent,prefix);
print_tagid(entry_ptr,SMALLINDENT,ifdtype);
value_offset =
print_offset_value(inptr,byteorder,entry_ptr,
fileoffset_base,listname,
ifdtype,indent,1);
}
break;
case TIFFTAG_StripByteCounts:
case TIFFTAG_TileByteCounts:
if((value_is_offset) && summary_entry)
{
tmp_length =
sum_strip_bytecounts(inptr,byteorder,
entry_ptr->value + fileoffset_base,
entry_ptr->count,entry_ptr->value_type);
summary_entry->length = tmp_length;
summary_entry->length_loc = entry_ptr->value + fileoffset_base;
if(summary_entry->noffsets != entry_ptr->count)
printred(" # Warning: number of bytecounts != number of offsets");
if(tmp_length > filesize)
{
chpr = newline(chpr);
PUSHCOLOR(HI_RED);
print_filename();
chpr += printf("# WARNING: total stripbytecount (%#lx/%lu) > filesize (%lu) ... wrong byteorder? ",
tmp_length,tmp_length,filesize);
print_byteorder(byteorder,1);
chpr = newline(chpr);
if(byteorder == TIFF_MOTOROLA)
alt_byteorder = TIFF_INTEL;
else
alt_byteorder = TIFF_MOTOROLA;
alt_length =
sum_strip_bytecounts(inptr,alt_byteorder,
entry_ptr->value + fileoffset_base,
entry_ptr->count,entry_ptr->value_type);
print_filename();
chpr += printf("# WARNING: total stripbytecount using alt byteorder [");
print_byteorder(alt_byteorder,1);
chpr += printf("] is %#lx/%lu ",
alt_length,alt_length);
chpr = newline(chpr);
if(alt_length < filesize)
summary_entry->length = alt_length;
else
{
print_filename();
chpr += printf("# WARNING: file may be truncated");
chpr = newline(chpr);
}
POPCOLOR();
}
}
if((PRINT_VALUE) && ((PRINT_VALUE_AT_OFFSET) && value_is_offset))
{
print_tag_address(ENTRY,fileoffset_base + entry_ptr->value,
indent,prefix);
print_tagid(entry_ptr,SMALLINDENT,ifdtype);
value_offset =
print_offset_value(inptr,byteorder,entry_ptr,
fileoffset_base,listname,
ifdtype,indent,1);
/* ###%%% find a way to print total */
/* ByteCount, at least in LIST mode */
}
break;
case TIFFTAG_JPEGTables:
nameoftag = tagname(entry_ptr->tag);
if((PRINT_VALUE) && ((PRINT_VALUE_AT_OFFSET) && value_is_offset))
{
if(PRINT_SECTION)
{
chpr = newline(chpr);
print_tag_address(ENTRY,fileoffset_base + entry_ptr->value,
indent,prefix);
chpr += printf("# Start of %s length %lu",nameoftag,
entry_ptr->count);
chpr = newline(chpr);
}
}
marker = read_ushort(inptr,TIFF_MOTOROLA,fileoffset_base + entry_ptr->value);
/* Need a new entry; this IFD's entry may be */
/* used for an image, but may not be locked */
/* yet. */
tmp_summary_entry = new_summary_entry(summary_entry,0,IMGFMT_JPEG);
value_offset = process_jpeg_segments(inptr,
fileoffset_base + entry_ptr->value,
marker,entry_ptr->count,
tmp_summary_entry,listname,
prefix,indent+SMALLINDENT);
if(tmp_summary_entry)
tmp_summary_entry->imagesubformat = TIFFTAG_JPEGTables;
if((PRINT_VALUE) && ((PRINT_VALUE_AT_OFFSET) && value_is_offset))
{
if((PRINT_SECTION))
{
/* ###%% check for early EOI; */
if((status = jpeg_status(0) == JPEG_EARLY_EOI))
chpr = newline(chpr);
jpeg_status(status);
print_tag_address(ENTRY,fileoffset_base + entry_ptr->value + entry_ptr->count + 1,
indent,prefix);
chpr += printf("# End of %s",nameoftag);
print_jpeg_status();
chpr = newline(chpr);
}
}
break;
case TIFFTAG_PrintIM:
if(next_ifd_offset && (cur_ifd_offset > next_ifd_offset))
prefix = "+";
else
prefix = "@";
process_pim(inptr,byteorder,entry_ptr->value,fileoffset_base,
entry_ptr->count,tagname(entry_ptr->tag),
listname,prefix,indent);
chpr = newline(0);
break;
default:
if((PRINT_VALUE) && ((PRINT_VALUE_AT_OFFSET) && value_is_offset))
{
print_tag_address(ENTRY,fileoffset_base + entry_ptr->value,
indent,prefix);
print_tagid(entry_ptr,SMALLINDENT,ifdtype);
value_offset =
print_offset_value(inptr,byteorder,entry_ptr,
fileoffset_base,listname,
ifdtype,indent,1);
}
break;
}
if(value_offset == 0L) /* bad entry; try the next one */
clearerr(inptr);
else if(value_offset > filesize)
goto blewit;
else if(value_offset > max_value_offset)
max_value_offset = value_offset;
}
}
else if(current_offset > max_value_offset)
max_value_offset = current_offset;
max_ifd_offset = max_value_offset;
indent -= SMALLINDENT;
/* max_ifd_offset is the maximum offset we've read so far; */
/* max_offset, if set, is the highest offset of this ifd, */
/* according to either the parent or the recently-read */
/* next_ifd_offset. */
if(max_offset && (max_ifd_offset > max_offset))
prefix = "?";
if(Debug & END_OF_SECTION_DEBUG)
printf("mo=%lu, mvo=%lu, mio=%lu, nio=%lu, ol=%lu, prefix=%s\n",
max_offset,max_value_offset,max_ifd_offset,
next_ifd_offset,offset_limit,prefix);
/* ================== show jpeg thumbnail =================== */
if(thn_offset || thn_length)
{
int startindent;
if(Debug & END_OF_SECTION_DEBUG)
printf("mo=%lu, ol=%lu, thno=%lu\n",max_offset,offset_limit,thn_offset);
/* This will be set only if a JpegInterchangeFormat tag */
/* has been seen, so this must be a JPEG thumbnail. The */
/* Exif spec indicates that the data should be written */
/* within the values section of the IFD, so scan and */
/* report here. If it appears to be written outside the */
/* bounds of the IFD, mark it. "max_offset" is the */
/* parent's idea (if any) of the extent of the IFD. */
/* "offset_limit" is the beginning of the Exif section, */
/* if present. */
if(max_offset && (thn_offset > max_offset))
tprefix = ">";
else if(offset_limit && (thn_offset > offset_limit))
tprefix = "+";
else
tprefix = prefix;
startindent = charsprinted();
print_tag_address(SECTION,thn_offset,indent + SMALLINDENT,tprefix);
if(PRINT_SECTION)
{
if(thn_length)
chpr += printf("#### Start of JPEG thumbnail data for IFD %d",ifdnum);
else
{
PUSHCOLOR(RED);
chpr += printf("#### ZERO LENGTH JPEG thumbnail for IFD %d",ifdnum);
POPCOLOR();
}
if((ifdtype == TIFF_SUBIFD) || (subifdnum >= 0))
chpr += printf(" SubIFD %d",subifdnum);
if(ifdtype == MAKER_IFD)
chpr += printf(" %s",ifdname);
else if(ifdtype == MAKER_SUBIFD)