/* pngwutil.c - utilities to write a PNG file
*
- * libpng version 1.2.7 - September 12, 2004
+ * Last changed in libpng 1.2.19 August 19, 2007
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2004 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.)
*/
* 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);
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);
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);
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);
{
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);
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);
{
png_byte buf[4];
+ if(png_ptr == NULL) return;
+
/* write the crc */
png_save_uint_32(buf, png_ptr->crc);
{
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)
{
#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");
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)
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
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;
}
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++)
{
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)
{
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);
}
/* 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);
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;
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;
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;
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;
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;
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;
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]);
/* 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");
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");
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);
png_write_chunk_start(png_ptr, (png_bytep)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);
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");
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 */
}
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);
/* 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_byte bunit = unit;
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)&bunit, 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
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_sCAL;
#endif
- png_size_t total_len;
- char wbuf[32], hbuf[32];
- png_byte bunit = unit;
+ 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)&bunit, 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
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
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
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 */
/* 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_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)
{
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;
}
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
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 */
/* 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;
}
deflateReset(&png_ptr->zstream);
+ png_ptr->zstream.data_type = Z_BINARY;
}
#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
* 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;
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
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)
png_ptr->prev_filters[j] = best_row[0];
}
#endif
+#endif /* PNG_NO_WRITE_FILTER */
}
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