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pending rewrite write byte 1.6.37 OOM allocating png_struct OOM allocating info structure INFO
END
<none> --debug --max= --max --optimize --out= --suffix= --prefix= --strip=none --strip=crc --strip=unsafe --strip=unused --strip=transform --strip=color --strip=all --errors -e --warnings -w --quiet -q --verbose -v FILE %s -> %s
rb wb output write error OPERATION the file. --optimize (-o): by the above options: values. MESSAGES --quiet (-q): --errors (-e): --warnings (-w): OUTPUT --out=<file>: --suffix=<suffix>: --prefix=<prefix>: INTERNAL OPTIONS EXIT CODES *** SUBJECT TO CHANGE *** non-zero code is returned). invalid arguments. DESCRIPTION pngfix: errors). be written to a new file. CHANGE in the future: The various fields are $2 reason: One of: Ыp`POO̮ܮ,<zK?3W@@@88``!|l\4XHh8x uarb_mult32 IDAT_init allocate read_callback calc_image_size process_zTXt_iCCP process_iTXt process_IDAT process_chunk zlib_reset zlib_check zlib_run zlib_advance rechunk_length IDAT_end 0w,aQ mjp5c飕d2y җ+L |~- d jHqA}mQDžӃVlkdzbeO\lcc=
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TN³9a&g`MGiIwn>JjѮZf @;7SŞϲG0 º0S$6к)WTg#.zfJah]+o*7 Z-!abcdefghijklmnopqrstuvwxyz56789 @ABCDEFGHIJKLMNOPQRSTUVWXYZ01234 idat->idat_index == idat->idat_length && idat->idat_length == cur->lengths[count] zlib->z.avail_out == 0 || zlib->z.avail_in == 0 zlib->z.avail_in == 0 || endrc != ZLIB_OK in_bytes == nbytes || endrc != ZLIB_OK zlib->rewrite_offset < chunk->chunk_length Tests, optimizes and optionally fixes the zlib header in PNG files. Usage: %s {[options] png-file}
file->chunk->chunk_type == png_IDAT file->image_digits >= 1 && file->image_digits <= 5 chunk != NULL && file->idat == NULL file->idat != NULL && file->chunk != NULL IDAT: uncompressed data too small (file->status_code & TRUNCATED) == 0 (file->status_code & TRUNCATED) != 0 length == sig1 && type == sig2 idat->idat_index == idat->idat_length idat->idat_count == cur->count %s: output file name too long: %s%s%s
%s: output file name too long: %s%s
Optionally, when fixing, strips ancillary chunks from the file. By default files are just checked for readability with a summary of the of zlib issues founds for each compressed chunk and the IDAT stream in Find the smallest deflate window size for the compressed data. --strip=[none|crc|unsafe|unused|transform|color|all]: none (default): Retain all chunks. crc: Remove chunks with a bad CRC. unsafe: Remove chunks that may be unsafe to retain if the image data is modified. This is set automatically if --max is given but may be cancelled by a later --strip=none. unused: Remove chunks not used by libpng when decoding an image. This retains any chunks that might be used by libpng image transformations. transform: unused+bKGD. color: transform+iCCP and cHRM. all: color+gAMA and sRGB. Only ancillary chunks are ever removed. In addition the tRNS and sBIT chunks are never removed as they affect exact interpretation of the image pixel values. The following known chunks are treated specially gAMA, sRGB [all]: These specify the gamma encoding used for the pixel cHRM, iCCP [color]: These specify how colors are encoded. iCCP also specifies the exact encoding of a pixel value; however, in practice most programs will ignore it. bKGD [transform]: This is used by libpng transforms. --max=<number>: Use IDAT chunks sized <number>. If no number is given the IDAT chunks will be the maximum size permitted; 2^31-1 bytes. If the option is omitted the original chunk sizes will not be changed. When the option is given --strip=unsafe is set automatically. This may be cancelled if you know that all unknown unsafe-to-copy chunks really are safe to copy across an IDAT size change. This is true of all chunks that have ever been formally proposed as PNG extensions. By default the program only outputs summaries for each file. Do not output the summaries except for files that cannot be read. With two --quiets these are not output either. Output errors from libpng and the program (except too-far-back). Output warnings from libpng. By default nothing is written. Write the optimized/corrected version of the next PNG to <file>. This overrides the following two options Set --out=<name><suffix> for all following files unless overridden on a per-file basis by explicit --out. Set --out=<prefix><name> for all the following files unless overridden on a per-file basis by explicit --out. These two options can be used together to produce a suffix and prefix. The program exit code is value in the range 0..127 holding a bit mask of the following codes. Notice that the results for each file are combined together - check one file at a time to get a meaningful error code! 0x01: The zlib too-far-back error existed in at least one chunk. 0x02: At least one chunk had a CRC error. 0x04: A chunk length was incorrect. 0x08: The file was truncated. Errors less than 16 are potentially recoverable, for a single file if the exit code is less than 16 the file could be read (with corrections if a 0x10: The file could not be read, even with corrections. 0x20: The output file could not be written. 0x40: An unexpected, potentially internal, error occurred. If the command line arguments are incorrect the program exits with exit 255. Some older operating systems only support 7-bit exit codes, on those systems it is suggested that this program is first tested by supplying checks each PNG file on the command line for errors. By default errors are not output and the program just returns an exit code and prints a summary. With the --quiet (-q) option the summaries are suppressed too and the program only outputs unexpected errors (internal errors and file open Various known problems in PNG files are fixed while the file is being read The exit code says what problems were fixed. In particular the zlib error: "invalid distance too far back" caused by an incorrect optimization of a zlib stream is fixed in any compressed chunk in which it is encountered. An integrity problem of the PNG stream caused by a bug in libpng which wrote an incorrect chunk length is also fixed. Chunk CRC errors are automatically fixed up. Setting one of the "OUTPUT" options causes the possibly modified file to Notice that some PNG files with the zlib optimization problem can still be read by libpng under some circumstances. This program will still detect and, if requested, correct the error. The program will reliably process all files on the command line unless either an invalid argument causes the usage message (this message) to be produced or the program crashes. The summary lines describe issues encountered with the zlib compressed stream of a chunk. They have the following format, which is SUBJECT TO chunk reason comp-level p1 p2 p3 p4 file p1 through p4 vary according to the 'reason'. There are always 8 space separated fields. Reasons specific formats are: chunk ERR status code read-errno write-errno message file chunk SKP comp-level file-bits zlib-rc compressed message file chunk ??? comp-level file-bits ok-bits compressed uncompress file $1 chunk: The chunk type of a chunk in the file or 'HEAD' if a problem is reported by libpng at the start of the IDAT stream. CHK: A zlib header checksum was detected and fixed. TFB: The zlib too far back error was detected and fixed. OK : No errors were detected in the zlib stream and optimization was not requested, or was not possible. OPT: The zlib stream window bits value could be improved (and was). SKP: The chunk was skipped because of a zlib issue (zlib-rc) with explanation 'message' ERR: The read of the file was aborted. 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