summaryrefslogtreecommitdiffstats
path: root/libpng/pngwutil.c
diff options
context:
space:
mode:
authordimitri <dimitri@afe2bf4a-e733-0410-8a33-86f594647bc7>2008-01-16 19:20:21 (GMT)
committerdimitri <dimitri@afe2bf4a-e733-0410-8a33-86f594647bc7>2008-01-16 19:20:21 (GMT)
commit8dab665567c9dffaa3f5fea198fc2110d536594d (patch)
tree78bac4e928b25e139605aceefa82537f378d8af0 /libpng/pngwutil.c
parentd3461a1c31f008345d784dc3e819047bc5265c30 (diff)
downloadDoxygen-8dab665567c9dffaa3f5fea198fc2110d536594d.zip
Doxygen-8dab665567c9dffaa3f5fea198fc2110d536594d.tar.gz
Doxygen-8dab665567c9dffaa3f5fea198fc2110d536594d.tar.bz2
Release-1.5.4
Diffstat (limited to 'libpng/pngwutil.c')
-rw-r--r--libpng/pngwutil.c353
1 files changed, 238 insertions, 115 deletions
diff --git a/libpng/pngwutil.c b/libpng/pngwutil.c
index 1f2d724..fef38ae 100644
--- a/libpng/pngwutil.c
+++ b/libpng/pngwutil.c
@@ -1,9 +1,9 @@
/* pngwutil.c - utilities to write a PNG file
*
- * libpng 1.2.1 - December 12, 2001
+ * Last changed in libpng 1.2.20 Septhember 3, 2007
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2007 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*/
@@ -16,7 +16,7 @@
* with unsigned numbers for convenience, although one supported
* ancillary chunk uses signed (two's complement) numbers.
*/
-void /* PRIVATE */
+void PNGAPI
png_save_uint_32(png_bytep buf, png_uint_32 i)
{
buf[0] = (png_byte)((i >> 24) & 0xff);
@@ -25,12 +25,11 @@ png_save_uint_32(png_bytep buf, png_uint_32 i)
buf[3] = (png_byte)(i & 0xff);
}
-#if defined(PNG_WRITE_pCAL_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
/* The png_save_int_32 function assumes integers are stored in two's
* complement format. If this isn't the case, then this routine needs to
* be modified to write data in two's complement format.
*/
-void /* PRIVATE */
+void PNGAPI
png_save_int_32(png_bytep buf, png_int_32 i)
{
buf[0] = (png_byte)((i >> 24) & 0xff);
@@ -38,13 +37,12 @@ png_save_int_32(png_bytep buf, png_int_32 i)
buf[2] = (png_byte)((i >> 8) & 0xff);
buf[3] = (png_byte)(i & 0xff);
}
-#endif
/* Place a 16-bit number into a buffer in PNG byte order.
* The parameter is declared unsigned int, not png_uint_16,
* just to avoid potential problems on pre-ANSI C compilers.
*/
-void /* PRIVATE */
+void PNGAPI
png_save_uint_16(png_bytep buf, unsigned int i)
{
buf[0] = (png_byte)((i >> 8) & 0xff);
@@ -64,6 +62,7 @@ void PNGAPI
png_write_chunk(png_structp png_ptr, png_bytep chunk_name,
png_bytep data, png_size_t length)
{
+ if(png_ptr == NULL) return;
png_write_chunk_start(png_ptr, chunk_name, (png_uint_32)length);
png_write_chunk_data(png_ptr, data, length);
png_write_chunk_end(png_ptr);
@@ -79,6 +78,7 @@ png_write_chunk_start(png_structp png_ptr, png_bytep chunk_name,
{
png_byte buf[4];
png_debug2(0, "Writing %s chunk (%lu bytes)\n", chunk_name, length);
+ if(png_ptr == NULL) return;
/* write the length */
png_save_uint_32(buf, length);
@@ -100,6 +100,7 @@ void PNGAPI
png_write_chunk_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
/* write the data, and run the CRC over it */
+ if(png_ptr == NULL) return;
if (data != NULL && length > 0)
{
png_calculate_crc(png_ptr, data, length);
@@ -113,6 +114,8 @@ png_write_chunk_end(png_structp png_ptr)
{
png_byte buf[4];
+ if(png_ptr == NULL) return;
+
/* write the crc */
png_save_uint_32(buf, png_ptr->crc);
@@ -161,9 +164,11 @@ png_text_compress(png_structp png_ptr,
{
int ret;
- comp->num_output_ptr = comp->max_output_ptr = 0;
+ comp->num_output_ptr = 0;
+ comp->max_output_ptr = 0;
comp->output_ptr = NULL;
comp->input = NULL;
+ comp->input_len = 0;
/* we may just want to pass the text right through */
if (compression == PNG_TEXT_COMPRESSION_NONE)
@@ -177,7 +182,7 @@ png_text_compress(png_structp png_ptr,
{
#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
char msg[50];
- sprintf(msg, "Unknown compression type %d", compression);
+ png_snprintf(msg, 50, "Unknown compression type %d", compression);
png_warning(png_ptr, msg);
#else
png_warning(png_ptr, "Unknown compression type");
@@ -219,7 +224,7 @@ png_text_compress(png_structp png_ptr,
png_error(png_ptr, "zlib error");
}
/* check to see if we need more room */
- if (!png_ptr->zstream.avail_out && png_ptr->zstream.avail_in)
+ if (!(png_ptr->zstream.avail_out))
{
/* make sure the output array has room */
if (comp->num_output_ptr >= comp->max_output_ptr)
@@ -234,14 +239,16 @@ png_text_compress(png_structp png_ptr,
old_ptr = comp->output_ptr;
comp->output_ptr = (png_charpp)png_malloc(png_ptr,
- (png_uint_32)(comp->max_output_ptr * sizeof (png_charpp)));
+ (png_uint_32)(comp->max_output_ptr *
+ png_sizeof (png_charpp)));
png_memcpy(comp->output_ptr, old_ptr, old_max
- * sizeof (png_charp));
+ * png_sizeof (png_charp));
png_free(png_ptr, old_ptr);
}
else
comp->output_ptr = (png_charpp)png_malloc(png_ptr,
- (png_uint_32)(comp->max_output_ptr * sizeof (png_charp)));
+ (png_uint_32)(comp->max_output_ptr *
+ png_sizeof (png_charp)));
}
/* save the data */
@@ -283,14 +290,16 @@ png_text_compress(png_structp png_ptr,
old_ptr = comp->output_ptr;
/* This could be optimized to realloc() */
comp->output_ptr = (png_charpp)png_malloc(png_ptr,
- (png_uint_32)(comp->max_output_ptr * sizeof (png_charpp)));
+ (png_uint_32)(comp->max_output_ptr *
+ png_sizeof (png_charpp)));
png_memcpy(comp->output_ptr, old_ptr,
- old_max * sizeof (png_charp));
+ old_max * png_sizeof (png_charp));
png_free(png_ptr, old_ptr);
}
else
comp->output_ptr = (png_charpp)png_malloc(png_ptr,
- (png_uint_32)(comp->max_output_ptr * sizeof (png_charp)));
+ (png_uint_32)(comp->max_output_ptr *
+ png_sizeof (png_charp)));
}
/* save off the data */
@@ -353,9 +362,9 @@ png_write_compressed_data_out(png_structp png_ptr, compression_state *comp)
png_write_chunk_data(png_ptr, png_ptr->zbuf,
png_ptr->zbuf_size - png_ptr->zstream.avail_out);
- /* reset zlib for another zTXt/iTXt or the image data */
+ /* reset zlib for another zTXt/iTXt or image data */
deflateReset(&png_ptr->zstream);
-
+ png_ptr->zstream.data_type = Z_BINARY;
}
#endif
@@ -464,11 +473,12 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
#if defined(PNG_MNG_FEATURES_SUPPORTED)
png_ptr->filter_type = (png_byte)filter_type;
#endif
+ png_ptr->compression_type = (png_byte)compression_type;
png_ptr->width = width;
png_ptr->height = height;
png_ptr->pixel_depth = (png_byte)(bit_depth * png_ptr->channels);
- png_ptr->rowbytes = ((width * (png_size_t)png_ptr->pixel_depth + 7) >> 3);
+ png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, width);
/* set the usr info, so any transformations can modify it */
png_ptr->usr_width = png_ptr->width;
png_ptr->usr_bit_depth = png_ptr->bit_depth;
@@ -484,7 +494,7 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
buf[12] = (png_byte)interlace_type;
/* write the chunk */
- png_write_chunk(png_ptr, (png_bytep)png_IHDR, buf, (png_size_t)13);
+ png_write_chunk(png_ptr, png_IHDR, buf, (png_size_t)13);
/* initialize zlib with PNG info */
png_ptr->zstream.zalloc = png_zalloc;
@@ -513,11 +523,15 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
png_ptr->zlib_window_bits = 15;
if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_METHOD))
png_ptr->zlib_method = 8;
- deflateInit2(&png_ptr->zstream, png_ptr->zlib_level,
+ if (deflateInit2(&png_ptr->zstream, png_ptr->zlib_level,
png_ptr->zlib_method, png_ptr->zlib_window_bits,
- png_ptr->zlib_mem_level, png_ptr->zlib_strategy);
+ png_ptr->zlib_mem_level, png_ptr->zlib_strategy) != Z_OK)
+ png_error(png_ptr, "zlib failed to initialize compressor");
png_ptr->zstream.next_out = png_ptr->zbuf;
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+ /* libpng is not interested in zstream.data_type */
+ /* set it to a predefined value, to avoid its evaluation inside zlib */
+ png_ptr->zstream.data_type = Z_BINARY;
png_ptr->mode = PNG_HAVE_IHDR;
}
@@ -564,7 +578,7 @@ png_write_PLTE(png_structp png_ptr, png_colorp palette, png_uint_32 num_pal)
png_ptr->num_palette = (png_uint_16)num_pal;
png_debug1(3, "num_palette = %d\n", png_ptr->num_palette);
- png_write_chunk_start(png_ptr, (png_bytep)png_PLTE, num_pal * 3);
+ png_write_chunk_start(png_ptr, png_PLTE, num_pal * 3);
#ifndef PNG_NO_POINTER_INDEXING
for (i = 0, pal_ptr = palette; i < num_pal; i++, pal_ptr++)
{
@@ -596,7 +610,47 @@ png_write_IDAT(png_structp png_ptr, png_bytep data, png_size_t length)
PNG_IDAT;
#endif
png_debug(1, "in png_write_IDAT\n");
- png_write_chunk(png_ptr, (png_bytep)png_IDAT, data, length);
+
+ /* Optimize the CMF field in the zlib stream. */
+ /* This hack of the zlib stream is compliant to the stream specification. */
+ if (!(png_ptr->mode & PNG_HAVE_IDAT) &&
+ png_ptr->compression_type == PNG_COMPRESSION_TYPE_BASE)
+ {
+ unsigned int z_cmf = data[0]; /* zlib compression method and flags */
+ if ((z_cmf & 0x0f) == 8 && (z_cmf & 0xf0) <= 0x70)
+ {
+ /* Avoid memory underflows and multiplication overflows. */
+ /* The conditions below are practically always satisfied;
+ however, they still must be checked. */
+ if (length >= 2 &&
+ png_ptr->height < 16384 && png_ptr->width < 16384)
+ {
+ png_uint_32 uncompressed_idat_size = png_ptr->height *
+ ((png_ptr->width *
+ png_ptr->channels * png_ptr->bit_depth + 15) >> 3);
+ unsigned int z_cinfo = z_cmf >> 4;
+ unsigned int half_z_window_size = 1 << (z_cinfo + 7);
+ while (uncompressed_idat_size <= half_z_window_size &&
+ half_z_window_size >= 256)
+ {
+ z_cinfo--;
+ half_z_window_size >>= 1;
+ }
+ z_cmf = (z_cmf & 0x0f) | (z_cinfo << 4);
+ if (data[0] != (png_byte)z_cmf)
+ {
+ data[0] = (png_byte)z_cmf;
+ data[1] &= 0xe0;
+ data[1] += (png_byte)(0x1f - ((z_cmf << 8) + data[1]) % 0x1f);
+ }
+ }
+ }
+ else
+ png_error(png_ptr,
+ "Invalid zlib compression method or flags in IDAT");
+ }
+
+ png_write_chunk(png_ptr, png_IDAT, data, length);
png_ptr->mode |= PNG_HAVE_IDAT;
}
@@ -608,7 +662,7 @@ png_write_IEND(png_structp png_ptr)
PNG_IEND;
#endif
png_debug(1, "in png_write_IEND\n");
- png_write_chunk(png_ptr, (png_bytep)png_IEND, png_bytep_NULL,
+ png_write_chunk(png_ptr, png_IEND, png_bytep_NULL,
(png_size_t)0);
png_ptr->mode |= PNG_HAVE_IEND;
}
@@ -629,7 +683,7 @@ png_write_gAMA(png_structp png_ptr, double file_gamma)
/* file_gamma is saved in 1/100,000ths */
igamma = (png_uint_32)(file_gamma * 100000.0 + 0.5);
png_save_uint_32(buf, igamma);
- png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, (png_size_t)4);
+ png_write_chunk(png_ptr, png_gAMA, buf, (png_size_t)4);
}
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
@@ -644,7 +698,7 @@ png_write_gAMA_fixed(png_structp png_ptr, png_fixed_point file_gamma)
png_debug(1, "in png_write_gAMA\n");
/* file_gamma is saved in 1/100,000ths */
png_save_uint_32(buf, (png_uint_32)file_gamma);
- png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, (png_size_t)4);
+ png_write_chunk(png_ptr, png_gAMA, buf, (png_size_t)4);
}
#endif
#endif
@@ -664,7 +718,7 @@ png_write_sRGB(png_structp png_ptr, int srgb_intent)
png_warning(png_ptr,
"Invalid sRGB rendering intent specified");
buf[0]=(png_byte)srgb_intent;
- png_write_chunk(png_ptr, (png_bytep)png_sRGB, buf, (png_size_t)1);
+ png_write_chunk(png_ptr, png_sRGB, buf, (png_size_t)1);
}
#endif
@@ -680,8 +734,16 @@ png_write_iCCP(png_structp png_ptr, png_charp name, int compression_type,
png_size_t name_len;
png_charp new_name;
compression_state comp;
+ int embedded_profile_len = 0;
png_debug(1, "in png_write_iCCP\n");
+
+ comp.num_output_ptr = 0;
+ comp.max_output_ptr = 0;
+ comp.output_ptr = NULL;
+ comp.input = NULL;
+ comp.input_len = 0;
+
if (name == NULL || (name_len = png_check_keyword(png_ptr, name,
&new_name)) == 0)
{
@@ -695,12 +757,33 @@ png_write_iCCP(png_structp png_ptr, png_charp name, int compression_type,
if (profile == NULL)
profile_len = 0;
+ if (profile_len > 3)
+ embedded_profile_len =
+ ((*( (png_bytep)profile ))<<24) |
+ ((*( (png_bytep)profile+1))<<16) |
+ ((*( (png_bytep)profile+2))<< 8) |
+ ((*( (png_bytep)profile+3)) );
+
+ if (profile_len < embedded_profile_len)
+ {
+ png_warning(png_ptr,
+ "Embedded profile length too large in iCCP chunk");
+ return;
+ }
+
+ if (profile_len > embedded_profile_len)
+ {
+ png_warning(png_ptr,
+ "Truncating profile to actual length in iCCP chunk");
+ profile_len = embedded_profile_len;
+ }
+
if (profile_len)
profile_len = png_text_compress(png_ptr, profile, (png_size_t)profile_len,
PNG_COMPRESSION_TYPE_BASE, &comp);
/* make sure we include the NULL after the name and the compression type */
- png_write_chunk_start(png_ptr, (png_bytep)png_iCCP,
+ png_write_chunk_start(png_ptr, png_iCCP,
(png_uint_32)name_len+profile_len+2);
new_name[name_len+1]=0x00;
png_write_chunk_data(png_ptr, (png_bytep)new_name, name_len + 2);
@@ -740,7 +823,7 @@ png_write_sPLT(png_structp png_ptr, png_sPLT_tp spalette)
}
/* make sure we include the NULL after the name */
- png_write_chunk_start(png_ptr, (png_bytep)png_sPLT,
+ png_write_chunk_start(png_ptr, png_sPLT,
(png_uint_32)(name_len + 2 + palette_size));
png_write_chunk_data(png_ptr, (png_bytep)new_name, name_len + 1);
png_write_chunk_data(png_ptr, (png_bytep)&spalette->depth, 1);
@@ -848,7 +931,7 @@ png_write_sBIT(png_structp png_ptr, png_color_8p sbit, int color_type)
buf[size++] = sbit->alpha;
}
- png_write_chunk(png_ptr, (png_bytep)png_sBIT, buf, size);
+ png_write_chunk(png_ptr, png_sBIT, buf, size);
}
#endif
@@ -882,8 +965,7 @@ png_write_cHRM(png_structp png_ptr, double white_x, double white_y,
itemp = (png_uint_32)(white_y * 100000.0 + 0.5);
png_save_uint_32(buf + 4, itemp);
- if (red_x < 0 || red_x > 0.8 || red_y < 0 || red_y > 0.8 ||
- red_x + red_y > 1.0)
+ if (red_x < 0 || red_y < 0 || red_x + red_y > 1.0)
{
png_warning(png_ptr, "Invalid cHRM red point specified");
return;
@@ -893,8 +975,7 @@ png_write_cHRM(png_structp png_ptr, double white_x, double white_y,
itemp = (png_uint_32)(red_y * 100000.0 + 0.5);
png_save_uint_32(buf + 12, itemp);
- if (green_x < 0 || green_x > 0.8 || green_y < 0 || green_y > 0.8 ||
- green_x + green_y > 1.0)
+ if (green_x < 0 || green_y < 0 || green_x + green_y > 1.0)
{
png_warning(png_ptr, "Invalid cHRM green point specified");
return;
@@ -904,8 +985,7 @@ png_write_cHRM(png_structp png_ptr, double white_x, double white_y,
itemp = (png_uint_32)(green_y * 100000.0 + 0.5);
png_save_uint_32(buf + 20, itemp);
- if (blue_x < 0 || blue_x > 0.8 || blue_y < 0 || blue_y > 0.8 ||
- blue_x + blue_y > 1.0)
+ if (blue_x < 0 || blue_y < 0 || blue_x + blue_y > 1.0)
{
png_warning(png_ptr, "Invalid cHRM blue point specified");
return;
@@ -915,7 +995,7 @@ png_write_cHRM(png_structp png_ptr, double white_x, double white_y,
itemp = (png_uint_32)(blue_y * 100000.0 + 0.5);
png_save_uint_32(buf + 28, itemp);
- png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32);
+ png_write_chunk(png_ptr, png_cHRM, buf, (png_size_t)32);
}
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
@@ -943,7 +1023,7 @@ png_write_cHRM_fixed(png_structp png_ptr, png_fixed_point white_x,
png_save_uint_32(buf, (png_uint_32)white_x);
png_save_uint_32(buf + 4, (png_uint_32)white_y);
- if (red_x > 80000L || red_y > 80000L || red_x + red_y > 100000L)
+ if (red_x + red_y > 100000L)
{
png_warning(png_ptr, "Invalid cHRM fixed red point specified");
return;
@@ -951,7 +1031,7 @@ png_write_cHRM_fixed(png_structp png_ptr, png_fixed_point white_x,
png_save_uint_32(buf + 8, (png_uint_32)red_x);
png_save_uint_32(buf + 12, (png_uint_32)red_y);
- if (green_x > 80000L || green_y > 80000L || green_x + green_y > 100000L)
+ if (green_x + green_y > 100000L)
{
png_warning(png_ptr, "Invalid fixed cHRM green point specified");
return;
@@ -959,7 +1039,7 @@ png_write_cHRM_fixed(png_structp png_ptr, png_fixed_point white_x,
png_save_uint_32(buf + 16, (png_uint_32)green_x);
png_save_uint_32(buf + 20, (png_uint_32)green_y);
- if (blue_x > 80000L || blue_y > 80000L || blue_x + blue_y > 100000L)
+ if (blue_x + blue_y > 100000L)
{
png_warning(png_ptr, "Invalid fixed cHRM blue point specified");
return;
@@ -967,7 +1047,7 @@ png_write_cHRM_fixed(png_structp png_ptr, png_fixed_point white_x,
png_save_uint_32(buf + 24, (png_uint_32)blue_x);
png_save_uint_32(buf + 28, (png_uint_32)blue_y);
- png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32);
+ png_write_chunk(png_ptr, png_cHRM, buf, (png_size_t)32);
}
#endif
#endif
@@ -992,7 +1072,7 @@ png_write_tRNS(png_structp png_ptr, png_bytep trans, png_color_16p tran,
return;
}
/* write the chunk out as it is */
- png_write_chunk(png_ptr, (png_bytep)png_tRNS, trans, (png_size_t)num_trans);
+ png_write_chunk(png_ptr, png_tRNS, trans, (png_size_t)num_trans);
}
else if (color_type == PNG_COLOR_TYPE_GRAY)
{
@@ -1004,7 +1084,7 @@ png_write_tRNS(png_structp png_ptr, png_bytep trans, png_color_16p tran,
return;
}
png_save_uint_16(buf, tran->gray);
- png_write_chunk(png_ptr, (png_bytep)png_tRNS, buf, (png_size_t)2);
+ png_write_chunk(png_ptr, png_tRNS, buf, (png_size_t)2);
}
else if (color_type == PNG_COLOR_TYPE_RGB)
{
@@ -1018,7 +1098,7 @@ png_write_tRNS(png_structp png_ptr, png_bytep trans, png_color_16p tran,
"Ignoring attempt to write 16-bit tRNS chunk when bit_depth is 8");
return;
}
- png_write_chunk(png_ptr, (png_bytep)png_tRNS, buf, (png_size_t)6);
+ png_write_chunk(png_ptr, png_tRNS, buf, (png_size_t)6);
}
else
{
@@ -1051,7 +1131,7 @@ png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type)
return;
}
buf[0] = back->index;
- png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)1);
+ png_write_chunk(png_ptr, png_bKGD, buf, (png_size_t)1);
}
else if (color_type & PNG_COLOR_MASK_COLOR)
{
@@ -1064,7 +1144,7 @@ png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type)
"Ignoring attempt to write 16-bit bKGD chunk when bit_depth is 8");
return;
}
- png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)6);
+ png_write_chunk(png_ptr, png_bKGD, buf, (png_size_t)6);
}
else
{
@@ -1075,7 +1155,7 @@ png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type)
return;
}
png_save_uint_16(buf, back->gray);
- png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)2);
+ png_write_chunk(png_ptr, png_bKGD, buf, (png_size_t)2);
}
}
#endif
@@ -1100,7 +1180,7 @@ png_write_hIST(png_structp png_ptr, png_uint_16p hist, int num_hist)
return;
}
- png_write_chunk_start(png_ptr, (png_bytep)png_hIST, (png_uint_32)(num_hist * 2));
+ png_write_chunk_start(png_ptr, png_hIST, (png_uint_32)(num_hist * 2));
for (i = 0; i < num_hist; i++)
{
png_save_uint_16(buf, hist[i]);
@@ -1141,17 +1221,24 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
png_debug1(2, "Keyword to be checked is '%s'\n", key);
- *new_key = (png_charp)png_malloc(png_ptr, (png_uint_32)(key_len + 2));
+ *new_key = (png_charp)png_malloc_warn(png_ptr, (png_uint_32)(key_len + 2));
+ if (*new_key == NULL)
+ {
+ png_warning(png_ptr, "Out of memory while procesing keyword");
+ return ((png_size_t)0);
+ }
/* Replace non-printing characters with a blank and print a warning */
for (kp = key, dp = *new_key; *kp != '\0'; kp++, dp++)
{
- if (*kp < 0x20 || (*kp > 0x7E && (png_byte)*kp < 0xA1))
+ if ((png_byte)*kp < 0x20 ||
+ ((png_byte)*kp > 0x7E && (png_byte)*kp < 0xA1))
{
#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
char msg[40];
- sprintf(msg, "invalid keyword character 0x%02X", *kp);
+ png_snprintf(msg, 40,
+ "invalid keyword character 0x%02X", (png_byte)*kp);
png_warning(png_ptr, msg);
#else
png_warning(png_ptr, "invalid character in keyword");
@@ -1259,7 +1346,7 @@ png_write_tEXt(png_structp png_ptr, png_charp key, png_charp text,
text_len = png_strlen(text);
/* make sure we include the 0 after the key */
- png_write_chunk_start(png_ptr, (png_bytep)png_tEXt, (png_uint_32)key_len+text_len+1);
+ png_write_chunk_start(png_ptr, png_tEXt, (png_uint_32)key_len+text_len+1);
/*
* We leave it to the application to meet PNG-1.0 requirements on the
* contents of the text. PNG-1.0 through PNG-1.2 discourage the use of
@@ -1291,6 +1378,12 @@ png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text,
png_debug(1, "in png_write_zTXt\n");
+ comp.num_output_ptr = 0;
+ comp.max_output_ptr = 0;
+ comp.output_ptr = NULL;
+ comp.input = NULL;
+ comp.input_len = 0;
+
if (key == NULL || (key_len = png_check_keyword(png_ptr, key, &new_key))==0)
{
png_warning(png_ptr, "Empty keyword in zTXt chunk");
@@ -1306,17 +1399,17 @@ png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text,
text_len = png_strlen(text);
- png_free(png_ptr, new_key);
-
/* compute the compressed data; do it now for the length */
text_len = png_text_compress(png_ptr, text, text_len, compression,
&comp);
/* write start of chunk */
- png_write_chunk_start(png_ptr, (png_bytep)png_zTXt, (png_uint_32)
+ png_write_chunk_start(png_ptr, png_zTXt, (png_uint_32)
(key_len+text_len+2));
/* write key */
- png_write_chunk_data(png_ptr, (png_bytep)key, key_len + 1);
+ png_write_chunk_data(png_ptr, (png_bytep)new_key, key_len + 1);
+ png_free(png_ptr, new_key);
+
buf[0] = (png_byte)compression;
/* write compression */
png_write_chunk_data(png_ptr, (png_bytep)buf, (png_size_t)1);
@@ -1344,31 +1437,42 @@ png_write_iTXt(png_structp png_ptr, int compression, png_charp key,
png_debug(1, "in png_write_iTXt\n");
+ comp.num_output_ptr = 0;
+ comp.max_output_ptr = 0;
+ comp.output_ptr = NULL;
+ comp.input = NULL;
+
if (key == NULL || (key_len = png_check_keyword(png_ptr, key, &new_key))==0)
{
png_warning(png_ptr, "Empty keyword in iTXt chunk");
return;
}
- if (lang == NULL || (lang_len = png_check_keyword(png_ptr, lang,
- &new_lang))==0)
+ if (lang == NULL || (lang_len = png_check_keyword(png_ptr, lang, &new_lang))==0)
{
png_warning(png_ptr, "Empty language field in iTXt chunk");
- return;
+ new_lang = NULL;
+ lang_len = 0;
}
- lang_key_len = png_strlen(lang_key);
- text_len = png_strlen(text);
- if (text == NULL || *text == '\0')
+ if (lang_key == NULL)
+ lang_key_len = 0;
+ else
+ lang_key_len = png_strlen(lang_key);
+
+ if (text == NULL)
text_len = 0;
+ else
+ text_len = png_strlen(text);
/* compute the compressed data; do it now for the length */
text_len = png_text_compress(png_ptr, text, text_len, compression-2,
&comp);
+
/* make sure we include the compression flag, the compression byte,
* and the NULs after the key, lang, and lang_key parts */
- png_write_chunk_start(png_ptr, (png_bytep)png_iTXt,
+ png_write_chunk_start(png_ptr, png_iTXt,
(png_uint_32)(
5 /* comp byte, comp flag, terminators for key, lang and lang_key */
+ key_len
@@ -1394,15 +1498,15 @@ png_write_iTXt(png_structp png_ptr, int compression, png_charp key,
cbuf[1] = 0;
png_write_chunk_data(png_ptr, cbuf, 2);
- png_write_chunk_data(png_ptr, (png_bytep)new_lang, lang_len + 1);
- png_write_chunk_data(png_ptr, (png_bytep)lang_key, lang_key_len+1);
- png_write_chunk_data(png_ptr, '\0', 1);
-
+ cbuf[0] = 0;
+ png_write_chunk_data(png_ptr, (new_lang ? (png_bytep)new_lang : cbuf), lang_len + 1);
+ png_write_chunk_data(png_ptr, (lang_key ? (png_bytep)lang_key : cbuf), lang_key_len + 1);
png_write_compressed_data_out(png_ptr, &comp);
png_write_chunk_end(png_ptr);
png_free(png_ptr, new_key);
- png_free(png_ptr, new_lang);
+ if (new_lang)
+ png_free(png_ptr, new_lang);
}
#endif
@@ -1425,10 +1529,9 @@ png_write_oFFs(png_structp png_ptr, png_int_32 x_offset, png_int_32 y_offset,
png_save_int_32(buf + 4, y_offset);
buf[8] = (png_byte)unit_type;
- png_write_chunk(png_ptr, (png_bytep)png_oFFs, buf, (png_size_t)9);
+ png_write_chunk(png_ptr, png_oFFs, buf, (png_size_t)9);
}
#endif
-
#if defined(PNG_WRITE_pCAL_SUPPORTED)
/* write the pCAL chunk (described in the PNG extensions document) */
void /* PRIVATE */
@@ -1455,7 +1558,7 @@ png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0,
total_len = purpose_len + units_len + 10;
params_len = (png_uint_32p)png_malloc(png_ptr, (png_uint_32)(nparams
- *sizeof(png_uint_32)));
+ *png_sizeof(png_uint_32)));
/* Find the length of each parameter, making sure we don't count the
null terminator for the last parameter. */
@@ -1467,7 +1570,7 @@ png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0,
}
png_debug1(3, "pCAL total length = %d\n", (int)total_len);
- png_write_chunk_start(png_ptr, (png_bytep)png_pCAL, (png_uint_32)total_len);
+ png_write_chunk_start(png_ptr, png_pCAL, (png_uint_32)total_len);
png_write_chunk_data(png_ptr, (png_bytep)new_purpose, purpose_len);
png_save_int_32(buf, X0);
png_save_int_32(buf + 4, X1);
@@ -1493,38 +1596,41 @@ png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0,
/* write the sCAL chunk */
#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
void /* PRIVATE */
-png_write_sCAL(png_structp png_ptr, int unit, double width,double height)
+png_write_sCAL(png_structp png_ptr, int unit, double width, double height)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_sCAL;
#endif
+ char buf[64];
png_size_t total_len;
- char wbuf[32], hbuf[32];
png_debug(1, "in png_write_sCAL\n");
+ buf[0] = (char)unit;
#if defined(_WIN32_WCE)
/* sprintf() function is not supported on WindowsCE */
{
wchar_t wc_buf[32];
+ size_t wc_len;
swprintf(wc_buf, TEXT("%12.12e"), width);
- WideCharToMultiByte(CP_ACP, 0, wc_buf, -1, wbuf, 32, NULL, NULL);
+ wc_len = wcslen(wc_buf);
+ WideCharToMultiByte(CP_ACP, 0, wc_buf, -1, buf + 1, wc_len, NULL, NULL);
+ total_len = wc_len + 2;
swprintf(wc_buf, TEXT("%12.12e"), height);
- WideCharToMultiByte(CP_ACP, 0, wc_buf, -1, hbuf, 32, NULL, NULL);
+ wc_len = wcslen(wc_buf);
+ WideCharToMultiByte(CP_ACP, 0, wc_buf, -1, buf + total_len, wc_len,
+ NULL, NULL);
+ total_len += wc_len;
}
#else
- sprintf(wbuf, "%12.12e", width);
- sprintf(hbuf, "%12.12e", height);
+ png_snprintf(buf + 1, 63, "%12.12e", width);
+ total_len = 1 + png_strlen(buf + 1) + 1;
+ png_snprintf(buf + total_len, 64-total_len, "%12.12e", height);
+ total_len += png_strlen(buf + total_len);
#endif
- total_len = 1 + png_strlen(wbuf)+1 + png_strlen(hbuf);
- png_debug1(3, "sCAL total length = %d\n", (int)total_len);
- png_write_chunk_start(png_ptr, (png_bytep)png_sCAL, (png_uint_32)total_len);
- png_write_chunk_data(png_ptr, (png_bytep)&unit, 1);
- png_write_chunk_data(png_ptr, (png_bytep)wbuf, png_strlen(wbuf)+1);
- png_write_chunk_data(png_ptr, (png_bytep)hbuf, png_strlen(hbuf));
-
- png_write_chunk_end(png_ptr);
+ png_debug1(3, "sCAL total length = %u\n", (unsigned int)total_len);
+ png_write_chunk(png_ptr, png_sCAL, (png_bytep)buf, total_len);
}
#else
#ifdef PNG_FIXED_POINT_SUPPORTED
@@ -1535,22 +1641,26 @@ png_write_sCAL_s(png_structp png_ptr, int unit, png_charp width,
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_sCAL;
#endif
- png_size_t total_len;
- char wbuf[32], hbuf[32];
+ png_byte buf[64];
+ png_size_t wlen, hlen, total_len;
png_debug(1, "in png_write_sCAL_s\n");
- png_strcpy(wbuf,(const char *)width);
- png_strcpy(hbuf,(const char *)height);
- total_len = 1 + png_strlen(wbuf)+1 + png_strlen(hbuf);
+ wlen = png_strlen(width);
+ hlen = png_strlen(height);
+ total_len = wlen + hlen + 2;
+ if (total_len > 64)
+ {
+ png_warning(png_ptr, "Can't write sCAL (buffer too small)");
+ return;
+ }
- png_debug1(3, "sCAL total length = %d\n", total_len);
- png_write_chunk_start(png_ptr, (png_bytep)png_sCAL, (png_uint_32)total_len);
- png_write_chunk_data(png_ptr, (png_bytep)&unit, 1);
- png_write_chunk_data(png_ptr, (png_bytep)wbuf, png_strlen(wbuf)+1);
- png_write_chunk_data(png_ptr, (png_bytep)hbuf, png_strlen(hbuf));
+ buf[0] = (png_byte)unit;
+ png_memcpy(buf + 1, width, wlen + 1); /* append the '\0' here */
+ png_memcpy(buf + wlen + 2, height, hlen); /* do NOT append the '\0' here */
- png_write_chunk_end(png_ptr);
+ png_debug1(3, "sCAL total length = %u\n", (unsigned int)total_len);
+ png_write_chunk(png_ptr, png_sCAL, buf, total_len);
}
#endif
#endif
@@ -1576,7 +1686,7 @@ png_write_pHYs(png_structp png_ptr, png_uint_32 x_pixels_per_unit,
png_save_uint_32(buf + 4, y_pixels_per_unit);
buf[8] = (png_byte)unit_type;
- png_write_chunk(png_ptr, (png_bytep)png_pHYs, buf, (png_size_t)9);
+ png_write_chunk(png_ptr, png_pHYs, buf, (png_size_t)9);
}
#endif
@@ -1608,7 +1718,7 @@ png_write_tIME(png_structp png_ptr, png_timep mod_time)
buf[5] = mod_time->minute;
buf[6] = mod_time->second;
- png_write_chunk(png_ptr, (png_bytep)png_tIME, buf, (png_size_t)7);
+ png_write_chunk(png_ptr, png_tIME, buf, (png_size_t)7);
}
#endif
@@ -1616,6 +1726,7 @@ png_write_tIME(png_structp png_ptr, png_timep mod_time)
void /* PRIVATE */
png_write_start_row(png_structp png_ptr)
{
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED
#ifdef PNG_USE_LOCAL_ARRAYS
/* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
@@ -1631,17 +1742,19 @@ png_write_start_row(png_structp png_ptr)
/* offset to next interlace block in the y direction */
int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
#endif
+#endif
png_size_t buf_size;
png_debug(1, "in png_write_start_row\n");
- buf_size = (png_size_t)(((png_ptr->width * png_ptr->usr_channels *
- png_ptr->usr_bit_depth + 7) >> 3) + 1);
+ buf_size = (png_size_t)(PNG_ROWBYTES(
+ png_ptr->usr_channels*png_ptr->usr_bit_depth,png_ptr->width)+1);
/* set up row buffer */
png_ptr->row_buf = (png_bytep)png_malloc(png_ptr, (png_uint_32)buf_size);
png_ptr->row_buf[0] = PNG_FILTER_VALUE_NONE;
+#ifndef PNG_NO_WRITE_FILTERING
/* set up filtering buffer, if using this filter */
if (png_ptr->do_filter & PNG_FILTER_SUB)
{
@@ -1659,7 +1772,7 @@ png_write_start_row(png_structp png_ptr)
if (png_ptr->do_filter & PNG_FILTER_UP)
{
- png_ptr->up_row = (png_bytep )png_malloc(png_ptr,
+ png_ptr->up_row = (png_bytep)png_malloc(png_ptr,
(png_ptr->rowbytes + 1));
png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
}
@@ -1673,10 +1786,11 @@ png_write_start_row(png_structp png_ptr)
if (png_ptr->do_filter & PNG_FILTER_PAETH)
{
- png_ptr->paeth_row = (png_bytep )png_malloc(png_ptr,
+ png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,
(png_ptr->rowbytes + 1));
png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
}
+#endif /* PNG_NO_WRITE_FILTERING */
}
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
@@ -1710,6 +1824,7 @@ png_write_start_row(png_structp png_ptr)
void /* PRIVATE */
png_write_finish_row(png_structp png_ptr)
{
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED
#ifdef PNG_USE_LOCAL_ARRAYS
/* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
@@ -1725,6 +1840,7 @@ png_write_finish_row(png_structp png_ptr)
/* offset to next interlace block in the y direction */
int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
#endif
+#endif
int ret;
@@ -1772,9 +1888,8 @@ png_write_finish_row(png_structp png_ptr)
{
if (png_ptr->prev_row != NULL)
png_memset(png_ptr->prev_row, 0,
- (png_size_t) (((png_uint_32)png_ptr->usr_channels *
- (png_uint_32)png_ptr->usr_bit_depth *
- png_ptr->width + 7) >> 3) + 1);
+ (png_size_t)(PNG_ROWBYTES(png_ptr->usr_channels*
+ png_ptr->usr_bit_depth,png_ptr->width))+1);
return;
}
}
@@ -1814,6 +1929,7 @@ png_write_finish_row(png_structp png_ptr)
}
deflateReset(&png_ptr->zstream);
+ png_ptr->zstream.data_type = Z_BINARY;
}
#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
@@ -1981,8 +2097,8 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
png_pass_inc[pass] - 1 -
png_pass_start[pass]) /
png_pass_inc[pass];
- row_info->rowbytes = ((row_info->width *
- row_info->pixel_depth + 7) >> 3);
+ row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,
+ row_info->width);
}
}
#endif
@@ -1991,14 +2107,16 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
* been specified by the application, and then writes the row out with the
* chosen filter.
*/
-#define PNG_MAXSUM (~((png_uint_32)0) >> 1)
+#define PNG_MAXSUM (((png_uint_32)(-1)) >> 1)
#define PNG_HISHIFT 10
#define PNG_LOMASK ((png_uint_32)0xffffL)
#define PNG_HIMASK ((png_uint_32)(~PNG_LOMASK >> PNG_HISHIFT))
void /* PRIVATE */
png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
{
- png_bytep prev_row, best_row, row_buf;
+ png_bytep best_row;
+#ifndef PNG_NO_WRITE_FILTER
+ png_bytep prev_row, row_buf;
png_uint_32 mins, bpp;
png_byte filter_to_do = png_ptr->do_filter;
png_uint_32 row_bytes = row_info->rowbytes;
@@ -2008,10 +2126,13 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
png_debug(1, "in png_write_find_filter\n");
/* find out how many bytes offset each pixel is */
- bpp = (row_info->pixel_depth + 7) / 8;
+ bpp = (row_info->pixel_depth + 7) >> 3;
prev_row = png_ptr->prev_row;
- best_row = row_buf = png_ptr->row_buf;
+#endif
+ best_row = png_ptr->row_buf;
+#ifndef PNG_NO_WRITE_FILTER
+ row_buf = best_row;
mins = PNG_MAXSUM;
/* The prediction method we use is to find which method provides the
@@ -2159,7 +2280,7 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
sum += (v < 128) ? v : 256 - v;
}
- for (lp = row_buf + 1; i < row_info->rowbytes;
+ for (lp = row_buf + 1; i < row_bytes;
i++, rp++, lp++, dp++)
{
v = *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff);
@@ -2586,11 +2707,12 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
best_row = png_ptr->paeth_row;
}
}
-
+#endif /* PNG_NO_WRITE_FILTER */
/* Do the actual writing of the filtered row data from the chosen filter. */
png_write_filtered_row(png_ptr, best_row);
+#ifndef PNG_NO_WRITE_FILTER
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
/* Save the type of filter we picked this time for future calculations */
if (png_ptr->num_prev_filters > 0)
@@ -2603,6 +2725,7 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
png_ptr->prev_filters[j] = best_row[0];
}
#endif
+#endif /* PNG_NO_WRITE_FILTER */
}