[devel] Complete rewrite of png_decompress_chunk() by John Bowler
This commit is contained in:
Glenn Randers-Pehrson
parent
389c1f20ad
commit
9d51afcacb
@ -1,7 +1,7 @@
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/* pngpriv.h - private declarations for use inside libpng
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*
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* libpng version 1.5.0beta05 - February 9, 2010
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* libpng version 1.4.1beta11 - February 13, 2010
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* For conditions of distribution and use, see copyright notice in png.h
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* Copyright (c) 1998-2010 Glenn Randers-Pehrson
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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@ -306,8 +306,6 @@ PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
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/* Decompress data in a chunk that uses compression */
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#if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
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defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
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PNG_EXTERN png_size_t png_measure_decompressed_chunk PNGARG((png_structp
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png_ptr, int comp_type, png_size_t chunklength, png_size_t prefix_length));
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PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
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int comp_type, png_size_t chunklength, png_size_t prefix_length,
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png_size_t *data_length));
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485
pngrutil.c
485
pngrutil.c
@ -1,7 +1,7 @@
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/* pngrutil.c - utilities to read a PNG file
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*
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* Last changed in libpng 1.4.1 [February 12, 2010]
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* Last changed in libpng 1.4.1 [February 13, 2010]
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* Copyright (c) 1998-2010 Glenn Randers-Pehrson
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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@ -201,72 +201,93 @@ png_crc_error(png_structp png_ptr)
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#if defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_READ_iTXt_SUPPORTED) || \
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defined(PNG_READ_iCCP_SUPPORTED)
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png_size_t
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png_measure_decompressed_chunk(png_structp png_ptr, int comp_type,
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png_size_t chunklength, png_size_t prefix_size)
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static png_size_t
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png_inflate(png_structp png_ptr, const png_byte *data, png_size_t size,
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png_bytep output, png_size_t output_size)
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{
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png_charp text;
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png_charp test = "X";
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png_size_t text_size = 0;
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png_size_t count = 0;
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if (comp_type == PNG_COMPRESSION_TYPE_BASE)
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png_ptr->zstream.next_in = (png_bytep)data; /* const_cast: VALID */
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png_ptr->zstream.avail_in = size;
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while (1)
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{
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int ret = Z_OK;
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int ret, avail;
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png_ptr->zstream.next_in = (png_bytep)(png_ptr->chunkdata + prefix_size);
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png_ptr->zstream.avail_in = (uInt)(chunklength - prefix_size);
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/* Reset the output buffer each time round - we empty it
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* after every inflate call.
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*/
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png_ptr->zstream.next_out = png_ptr->zbuf;
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png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
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png_ptr->zstream.avail_out = png_ptr->zbuf_size;
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text = NULL;
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ret = inflate(&png_ptr->zstream, Z_NO_FLUSH);
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avail = png_ptr->zbuf_size - png_ptr->zstream.avail_out;
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while (png_ptr->zstream.avail_in)
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/* First copy/count any new output - but only if we didn't
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* get an error code.
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*/
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if ((ret == Z_OK || ret == Z_STREAM_END) && avail > 0)
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{
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ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
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if (ret != Z_OK && ret != Z_STREAM_END)
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break;
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if (output != 0 && output_size > count)
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{
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int copy = output_size - count;
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if (avail < copy) copy = avail;
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png_memcpy(output + count, png_ptr->zbuf, copy);
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}
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count += avail;
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}
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if (!png_ptr->zstream.avail_out || ret == Z_STREAM_END)
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{
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if (text == NULL) /* Initialize the decompression buffer */
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{
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text_size = prefix_size +
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png_ptr->zbuf_size - png_ptr->zstream.avail_out;
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if (ret == Z_OK)
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continue;
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/* Termination conditions - always reset the zstream, it
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* must be left in inflateInit state.
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*/
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png_ptr->zstream.avail_in = 0;
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inflateReset(&png_ptr->zstream);
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text=test;
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}
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else /* Enlarge the decompression buffer */
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{
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text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out;
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#ifdef PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED
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if (png_ptr->user_chunk_malloc_max &&
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(text_size >= png_ptr->user_chunk_malloc_max - 1))
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#else
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if ((PNG_USER_CHUNK_MALLOC_MAX > 0) &&
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text_size >= PNG_USER_CHUNK_MALLOC_MAX - 1)
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#endif
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{
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png_warning(png_ptr,
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"Exceeded malloc limit while expanding chunk");
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text_size = 0;
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break;
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}
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}
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}
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if (ret == Z_STREAM_END)
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break;
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return count; /* NOTE: may be zero. */
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/* Now handle the error codes - the API always returns 0
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* and the error message is dumped into the uncompressed
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* buffer if available.
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*/
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{
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char *msg, umsg[52];
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if (png_ptr->zstream.msg != 0)
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msg = png_ptr->zstream.msg;
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else
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{
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png_ptr->zstream.next_out = png_ptr->zbuf;
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png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
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}
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#ifdef PNG_STDIO_SUPPORTED
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switch (ret)
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{
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case Z_BUF_ERROR:
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msg = "Buffer error in compressed datastream in %s chunk";
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break;
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case Z_DATA_ERROR:
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msg = "Data error in compressed datastream in %s chunk";
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break;
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default:
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msg = "Incomplete compressed datastream in %s chunk";
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break;
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}
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inflateReset(&png_ptr->zstream);
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png_ptr->zstream.avail_in = 0;
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png_snprintf(umsg, sizeof umsg, msg, png_ptr->chunk_name);
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msg = umsg;
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#else
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msg = "Damaged compressed datastream in chunk other than IDAT";
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#endif
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}
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png_warning(png_ptr, msg);
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}
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/* 0 means an error - notice that this code simple ignores
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* zero length compressed chunks as a result.
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*/
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return 0;
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}
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return text_size;
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}
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/*
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@ -281,338 +302,106 @@ png_decompress_chunk(png_structp png_ptr, int comp_type,
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png_size_t chunklength,
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png_size_t prefix_size, png_size_t *newlength)
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{
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static PNG_CONST char msg[] = "Error decoding compressed chunk";
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png_charp text;
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png_size_t text_size;
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png_size_t expanded_size;
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expanded_size = png_measure_decompressed_chunk(png_ptr, comp_type,
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chunklength, prefix_size);
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if (expanded_size == 0)
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/* The caller should guarantee this */
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if (prefix_size > chunklength)
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{
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*newlength=0;
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return;
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/* The recovery is to delete the chunk. */
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png_warning(png_ptr, "invalid chunklength");
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prefix_size = 0; /* To delete everything */
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}
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else if (comp_type == PNG_COMPRESSION_TYPE_BASE)
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{
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png_size_t expanded_size = png_inflate(png_ptr,
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png_ptr->chunkdata + prefix_size,
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chunklength - prefix_size,
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0/*output*/, 0/*output size*/);
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if (comp_type == PNG_COMPRESSION_TYPE_BASE)
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{
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int ret = Z_OK;
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png_ptr->zstream.next_in = (png_bytep)(png_ptr->chunkdata + prefix_size);
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png_ptr->zstream.avail_in = (uInt)(chunklength - prefix_size);
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png_ptr->zstream.next_out = png_ptr->zbuf;
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png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
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text_size = 0;
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text = NULL;
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while (png_ptr->zstream.avail_in)
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{
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ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
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if (ret != Z_OK && ret != Z_STREAM_END)
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{
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if (png_ptr->zstream.msg != NULL)
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png_warning(png_ptr, png_ptr->zstream.msg);
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else
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png_warning(png_ptr, msg);
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inflateReset(&png_ptr->zstream);
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png_ptr->zstream.avail_in = 0;
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if (text == NULL)
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{
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text_size = prefix_size + png_sizeof(msg) + 1;
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text = (png_charp)png_malloc_warn(png_ptr, text_size);
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if (text == NULL)
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{
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png_free(png_ptr, png_ptr->chunkdata);
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png_ptr->chunkdata = NULL;
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png_error(png_ptr, "Not enough memory to decompress chunk");
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}
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png_memcpy(text, png_ptr->chunkdata, prefix_size);
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}
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text[text_size - 1] = 0x00;
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/* Copy what we can of the error message into the text chunk */
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text_size = (png_size_t)(chunklength -
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(text - png_ptr->chunkdata) - 1);
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if (text_size > png_sizeof(msg))
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text_size = png_sizeof(msg);
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png_memcpy(text + prefix_size, msg, text_size);
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break;
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}
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if (!png_ptr->zstream.avail_out || ret == Z_STREAM_END)
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{
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if (text == NULL)
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{
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text_size = prefix_size +
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png_ptr->zbuf_size - png_ptr->zstream.avail_out;
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text = (png_charp)png_malloc_warn(png_ptr, text_size + 1);
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if (text == NULL)
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{
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png_free(png_ptr, png_ptr->chunkdata);
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png_ptr->chunkdata = NULL;
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png_error(png_ptr,
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"Not enough memory to decompress chunk");
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}
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png_memcpy(text + prefix_size, png_ptr->zbuf,
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text_size - prefix_size);
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png_memcpy(text, png_ptr->chunkdata, prefix_size);
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*(text + text_size) = 0x00;
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}
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else
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{
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png_charp tmp;
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tmp = text;
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text = (png_charp)png_malloc_warn(png_ptr,
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(png_size_t)(text_size +
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png_ptr->zbuf_size - png_ptr->zstream.avail_out + 1));
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if (text == NULL)
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{
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png_free(png_ptr, tmp);
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png_free(png_ptr, png_ptr->chunkdata);
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png_ptr->chunkdata = NULL;
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png_error(png_ptr,
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"Not enough memory to decompress chunk");
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}
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png_memcpy(text, tmp, text_size);
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png_free(png_ptr, tmp);
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png_memcpy(text + text_size, png_ptr->zbuf,
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(png_ptr->zbuf_size - png_ptr->zstream.avail_out));
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text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out;
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*(text + text_size) = 0x00;
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}
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if (ret == Z_STREAM_END)
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break;
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else
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{
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png_ptr->zstream.next_out = png_ptr->zbuf;
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png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
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}
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}
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}
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if (ret != Z_STREAM_END)
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{
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#ifdef PNG_STDIO_SUPPORTED
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char umsg[52];
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if (ret == Z_BUF_ERROR)
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png_snprintf(umsg, 52,
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"Buffer error in compressed datastream in %s chunk",
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png_ptr->chunk_name);
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else if (ret == Z_DATA_ERROR)
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png_snprintf(umsg, 52,
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"Data error in compressed datastream in %s chunk",
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png_ptr->chunk_name);
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else
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png_snprintf(umsg, 52,
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"Incomplete compressed datastream in %s chunk",
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png_ptr->chunk_name);
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png_warning(png_ptr, umsg);
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/* Now check the limits on this chunk - if the limit fails the
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* compressed data will be removed, the prefix will remain.
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*/
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#ifdef PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED
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if (png_ptr->user_chunk_malloc_max &&
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(prefix_size + expanded_size >= png_ptr->user_chunk_malloc_max - 1))
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#else
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png_warning(png_ptr,
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"Incomplete compressed datastream in chunk other than IDAT");
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if ((PNG_USER_CHUNK_MALLOC_MAX > 0) &&
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prefix_size + expanded_size >= PNG_USER_CHUNK_MALLOC_MAX - 1)
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#endif
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text_size = prefix_size;
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if (text == NULL)
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png_warning(png_ptr, "Exceeded size limit while expanding chunk");
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/* If the size is zero either there was an error and a message
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* has already been output (warning) or the size really is zero
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* and we have nothing to do - the code will exit through the
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* error case below.
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*/
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else if (expanded_size > 0)
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{
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text = (png_charp)png_malloc_warn(png_ptr, text_size+1);
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if (text == NULL)
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/* Success (maybe) - really uncompress the chunk. */
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png_size_t new_size = 0;
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png_charp text = png_malloc_warn(png_ptr,
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prefix_size + expanded_size + 1);
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if (text != NULL)
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{
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png_free(png_ptr, png_ptr->chunkdata);
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png_ptr->chunkdata = NULL;
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png_error(png_ptr, "Not enough memory for text");
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}
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png_memcpy(text, png_ptr->chunkdata, prefix_size);
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}
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*(text + text_size) = 0x00;
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}
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inflateReset(&png_ptr->zstream);
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png_ptr->zstream.avail_in = 0;
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new_size = png_inflate(png_ptr,
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png_ptr->chunkdata + prefix_size,
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chunklength - prefix_size,
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text + prefix_size, expanded_size);
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text[prefix_size + expanded_size] = 0; /* just in case */
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if (new_size == expanded_size)
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{
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png_free(png_ptr, png_ptr->chunkdata);
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png_ptr->chunkdata = text;
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*newlength=text_size;
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*newlength = prefix_size + expanded_size;
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return; /* The success return! */
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}
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png_warning(png_ptr, "png_inflate logic error");
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png_free(png_ptr, text);
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}
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else
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png_warning(png_ptr, "Not enough memory to decompress chunk");
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}
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}
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else /* if (comp_type != PNG_COMPRESSION_TYPE_BASE) */
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{
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#ifdef PNG_STDIO_SUPPORTED
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char umsg[50];
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png_snprintf(umsg, 50, "Unknown zTXt compression type %d", comp_type);
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#ifdef PNG_STDIO_SUPPORTED
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png_snprintf(umsg, sizeof umsg, "Unknown zTXt compression type %d", comp_type);
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png_warning(png_ptr, umsg);
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#else
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png_warning(png_ptr, "Unknown zTXt compression type");
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#endif
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*(png_ptr->chunkdata + prefix_size) = 0x00;
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*newlength = prefix_size;
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}
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}
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#if 0 /* doesn't work */
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{
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static PNG_CONST char msg[] = "Error decoding compressed chunk";
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png_charp text;
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png_size_t text_size;
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png_size_t expanded_size;
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expanded_size = png_measure_decompressed_chunk(png_ptr, comp_type,
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chunklength, prefix_size);
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if (expanded_size == 0)
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{
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*newlength=0;
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return;
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/* The recovery is to simply drop the data. */
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}
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if (comp_type == PNG_COMPRESSION_TYPE_BASE)
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/* Generic error return - leave the prefix, delete the compressed
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* data, reallocate the chunkdata to remove the potentially large
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* amount of compressed data.
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*/
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{
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int ret = Z_OK;
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png_ptr->zstream.next_in = (png_bytep)(png_ptr->chunkdata + prefix_size);
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png_ptr->zstream.avail_in = (uInt)(chunklength - prefix_size);
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png_ptr->zstream.next_out = png_ptr->zbuf;
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png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
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text_size = 0;
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text = NULL;
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while (png_ptr->zstream.avail_in)
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png_charp text = png_malloc_warn(png_ptr, prefix_size + 1);
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if (text != NULL)
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{
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ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
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if (ret != Z_OK && ret != Z_STREAM_END)
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{
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if (png_ptr->zstream.msg != NULL)
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png_warning(png_ptr, png_ptr->zstream.msg);
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else
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png_warning(png_ptr, msg);
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inflateReset(&png_ptr->zstream);
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png_ptr->zstream.avail_in = 0;
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if (text == NULL)
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{
|
||||
text_size = prefix_size + png_sizeof(msg) + 1;
|
||||
text = (png_charp)png_malloc_warn(png_ptr, text_size);
|
||||
if (text == NULL)
|
||||
{
|
||||
png_error(png_ptr,
|
||||
"Not enough memory to decompress chunk");
|
||||
text_size = 0;
|
||||
break;
|
||||
}
|
||||
if (prefix_size > 0)
|
||||
png_memcpy(text, png_ptr->chunkdata, prefix_size);
|
||||
}
|
||||
|
||||
text[text_size - 1] = 0x00;
|
||||
|
||||
/* Copy what we can of the error message into the text chunk */
|
||||
text_size = (png_size_t)(chunklength -
|
||||
(text - png_ptr->chunkdata) - 1);
|
||||
|
||||
if (text_size > png_sizeof(msg))
|
||||
text_size = png_sizeof(msg);
|
||||
|
||||
png_memcpy(text + prefix_size, msg, text_size);
|
||||
break;
|
||||
}
|
||||
if (!png_ptr->zstream.avail_out || ret == Z_STREAM_END)
|
||||
{
|
||||
if (text == NULL) /* Initialize the decompression buffer */
|
||||
{
|
||||
text_size = expanded_size;
|
||||
|
||||
text = (png_charp)png_malloc_warn(png_ptr, text_size + 1);
|
||||
if (text == NULL)
|
||||
{
|
||||
png_error(png_ptr,
|
||||
"Not enough memory to decompress chunk");
|
||||
text_size = 0;
|
||||
break;
|
||||
}
|
||||
png_memcpy(text + prefix_size, png_ptr->zbuf,
|
||||
text_size - prefix_size);
|
||||
png_memcpy(text, png_ptr->chunkdata, prefix_size);
|
||||
*(text + text_size) = 0x00;
|
||||
}
|
||||
if (ret == Z_STREAM_END)
|
||||
break;
|
||||
|
||||
else
|
||||
{
|
||||
png_ptr->zstream.next_out = png_ptr->zbuf;
|
||||
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (ret != Z_STREAM_END)
|
||||
{
|
||||
#ifdef PNG_STDIO_SUPPORTED
|
||||
char umsg[52];
|
||||
|
||||
if (ret == Z_BUF_ERROR)
|
||||
png_snprintf(umsg, 52,
|
||||
"Buffer error in compressed datastream in %s chunk",
|
||||
png_ptr->chunk_name);
|
||||
|
||||
else if (ret == Z_DATA_ERROR)
|
||||
png_snprintf(umsg, 52,
|
||||
"Data error in compressed datastream in %s chunk",
|
||||
png_ptr->chunk_name);
|
||||
|
||||
else
|
||||
png_snprintf(umsg, 52,
|
||||
"Incomplete compressed datastream in %s chunk",
|
||||
png_ptr->chunk_name);
|
||||
|
||||
png_warning(png_ptr, umsg);
|
||||
#else
|
||||
png_warning(png_ptr,
|
||||
"Incomplete compressed datastream in chunk other than IDAT");
|
||||
#endif
|
||||
text_size = prefix_size;
|
||||
if (text == NULL)
|
||||
{
|
||||
text = (png_charp)png_malloc_warn(png_ptr, text_size+1);
|
||||
if (text == NULL)
|
||||
{
|
||||
png_free(png_ptr, png_ptr->chunkdata);
|
||||
png_ptr->chunkdata = NULL;
|
||||
png_error(png_ptr, "Not enough memory for text");
|
||||
}
|
||||
png_memcpy(text, png_ptr->chunkdata, prefix_size);
|
||||
}
|
||||
*(text + text_size) = 0x00;
|
||||
}
|
||||
|
||||
inflateReset(&png_ptr->zstream);
|
||||
png_ptr->zstream.avail_in = 0;
|
||||
|
||||
png_free(png_ptr, png_ptr->chunkdata);
|
||||
png_ptr->chunkdata = text;
|
||||
*newlength=text_size;
|
||||
}
|
||||
else /* if (comp_type != PNG_COMPRESSION_TYPE_BASE) */
|
||||
{
|
||||
#ifdef PNG_STDIO_SUPPORTED
|
||||
char umsg[50];
|
||||
|
||||
png_snprintf(umsg, 50, "Unknown zTXt compression type %d", comp_type);
|
||||
png_warning(png_ptr, umsg);
|
||||
#else
|
||||
png_warning(png_ptr, "Unknown zTXt compression type");
|
||||
#endif
|
||||
|
||||
/* This is an extra zero in the 'uncompressed' part. */
|
||||
*(png_ptr->chunkdata + prefix_size) = 0x00;
|
||||
*newlength = prefix_size;
|
||||
}
|
||||
/* Ignore a malloc error here - it is safe. */
|
||||
}
|
||||
|
||||
*newlength = prefix_size;
|
||||
}
|
||||
#endif
|
||||
#endif
|
||||
|
||||
/* Read and check the IDHR chunk */
|
||||
void /* PRIVATE */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user