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* ChangeLog (oldest first):
*
* Started by Alexander Lehmann <alex@hal.rhein-main.de> and subsequently
* extended by people as listed below.
*
* AL - Alexander Lehmann
* AED - Andreas Dilger
* GRP - Glenn Randers-Pehrson
* GRR - Greg Roelofs
* JB - John Bowler
* TGL - Tom Lane
*
* 19950223 AL: fixed wrong magic numbers
*
* 19950313 AL: crc code from png spec, compiles on memory impaired PCs now,
* check for IHDR/IEND chunks
*
* 19950325 GRP: rewrote magic-number-checking and moved it to
* PNG_check_magic(buffer)
*
* 19950327 AL: fixed CRC code for 64 bit, -t switch, unsigned char vs. char
* pointer changes
*
* 19960601 AL: check for data after IEND chunk
*
* 19950601 GRR: reformatted; print tEXt and zTXt keywords; added usage
*
* 19950731 AL: check for control chars, check for MacBinary header, new
* force option
*
* 19950827 AL: merged Greg's 1.61 changes: print IHDR and tIME contents,
* call emx wildcard function
*
* 19951121 AED: re-ordered internal chunk checking in pngcheck().
* Now decodes most of the known chunk types to check for invalid
* contents (except IDAT and zTXt). Information is printed
* about the contents of known chunks, and unknown chunks have
* their chunk name flags decoded. Also checks chunk ordering.
*
* 19951126 AED: minor bug fixes and nicening of the output. Checks for
* valid cHRM contents per Chris Lilley's recommendation.
*
* 19951204 AED: minor bug in cHRM error output fixed
*
* 19960105 AED: added -q flaq to only output a message if an error occurrs
*
* 19960119 AED: added ability to parse multiple options with a single '-'
* changed tIME output to be in RFC 1123 format
*
* 19960517 GRR: fixed obvious(?) fprintf error; fixed multiple-tIME error msg
*
* 19960521 AL: fixed two tRNS errors reported by someone from W3C (whose name
* I currently don't remember) (complained about missing palette
* in greyscale images, missing breaks in case statement)
* avoid reference to undefined array entry with out of range ityp
*
* 19960605 AED: removed extra linefeed from cHRM output when not verbose
* added test to see if sBIT contents are valid
* added test for zero width or height in IHDR
* added test for insufficient IDAT data (minimum 10 bytes)
*
* 19960605 AED: added -p flag to dump the palette contents
*
* 19961231 JB: add decoding of the zlib header from the first IDAT chunk (16-
* bit header code in first two bytes, see print_zlibheader).
*
* 19970102 GRR: more sensible zlib-header output (version "1.97grr"); nuked
* some tabs; fixed blank lines between files in verbose output
*
* 19970106 AED: initialize the command-line flags
* add macros to ensure the error level doesn't go down
* return error level to calling program
* consolidate PNG magic on one place
* add "-" as input file for stdin
* check for valid tEXt/zTXt keywords per PNG Spec 1.0
* slight modification to output of tEXt/zTXt keywords/contents
* change 'extract' to only output valid chunks (unless forced)
* this may allow one to fix minor errors in a PNG file
*
* 19970107 GRR: added USE_ZLIB compile option to print line filters (with -vv)
* 19970110 GRR: fixed line-filters code for large-IDAT case
* 19970621 GRR: added compression-ratio info
* 19980609 TGL: fixed pHYs buglet
* 19980609 GRR: re-integrated minimal MNG support from 97.01.21 branch
* 19980610 GRR: extended MNG (MHDR info, DHDR, nEED, DEFI, FRAM, MEND)
* 19980611 GRR: extended MNG (more FRAM info; LOOP, ENDL)
* 19980612 GRR: extended MNG (FRAM, BACK, MOVE, CLON, SHOW, CLIP, fPRI, eXPI)
* 19980616 GRR: extended MNG (PROM, SAVE, SEEK)
* 19980702 GRR: fixed line-filters bug reported by Theodore Goodman (97.10.19);
* updated SAVE for MNG Draft 43
* 19980711 GRR: added sPLT; extended printpal (-p) to support tRNS, hIST, sPLT
* 19981021 GRR: added Win32 fix and compilation info; fixed mng=0, DEFI and
* printpal bugs
* 19981206 GRR: added "File: %s" for printpal; fixed some plural%s; fixed and
* extended unknown-chunk info (separate line now); added dpi info
* to pHYs and flagged unit types > 1 as error
* 19981228 GRR: nuked old comments; added proto-copyright message
* 19990201 GRR: changed control-character warning to "one or more"
* 19990327 GRR: added option to indent printtext; changed non-verbose summary
* to two lines; added tRNS info to summary
* 19990613 GRR: fixed remaining "must precede IDAT" messages for MNG; updated
* MHDR and LOOP for Draft 64
* 19990619 GRR: released version 1.99-grr1
* 19990620 GRR: fixed Glenn's e-mail address and help-screen MNG-draft version;
* disabled compression ratio for MNG; updated FRAM for Draft 64;
* fixed "not enough IDAT data" IEND bug; renamed
* PNG_MNG_check_magic() to check_magic(); renamed
* PNG_check_chunk_name() to check_chunk_name();
* 19990713 GRP: fixed MNG global-PLTE case (zero-length allowed)
* 19990718 GRR: shortened non-verbose summary so fits on one line again; added
* BASI and PPLT
* 19991114 GRR: added gIFg, gIFx and part of gIFt
* 19991117 GRR: finished gIFt; added sRGB and iCCP
* 19991117 GRR: released version 1.99.2
* 19991122 GRR: fixed typo in gIFx application ID format (%.*s)
* 19991215 GRR: added notes about wildcard expansion under Windows
* 20000304 GRR: fixed indentation on -vt printing of zTXt chunk; fixed bogus
* double-backslash bug in printtext(); added -vvvv data-dump
* capability (very crude, not correct, ... needs much work)
* 20000902 GRR: added JNG support; JHDR, JDAT, JSEP; fRAc, iTXt, pCAL, mkBF,
* mkBS, mkBT, prVW
* 20000902 GRR: released version 1.99.3
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