X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/706b88074de0c288b81edac13094dd052b6cc078..9d5507f7a2701395e1d5c121bd877bb9066ee6ea:/src/png/pngwutil.c diff --git a/src/png/pngwutil.c b/src/png/pngwutil.c index 17938d2278..c79b1fec6f 100644 --- a/src/png/pngwutil.c +++ b/src/png/pngwutil.c @@ -1,9 +1,9 @@ /* 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.) */ @@ -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) @@ -357,9 +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 @@ -518,11 +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; } @@ -569,7 +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++) { @@ -725,8 +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) { @@ -740,12 +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); @@ -785,7 +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); @@ -927,8 +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; @@ -938,8 +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; @@ -949,8 +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; @@ -988,7 +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; @@ -996,7 +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; @@ -1004,7 +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; @@ -1145,7 +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]); @@ -1196,12 +1231,14 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key) /* 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"); @@ -1341,6 +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"); @@ -1356,8 +1399,6 @@ 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); @@ -1366,7 +1407,9 @@ png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text, 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); @@ -1394,6 +1437,11 @@ 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"); @@ -1481,10 +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 */ @@ -1523,7 +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); @@ -1549,39 +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_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 @@ -1592,23 +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 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 @@ -1634,7 +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 @@ -1666,7 +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 @@ -1674,6 +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 */ @@ -1688,6 +1741,7 @@ 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; @@ -1700,6 +1754,7 @@ png_write_start_row(png_structp png_ptr) 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) { @@ -1717,7 +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; } @@ -1731,10 +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 @@ -1768,6 +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 */ @@ -1782,6 +1839,7 @@ 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; @@ -1871,6 +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) @@ -2048,14 +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; @@ -2068,7 +2129,10 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) 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 @@ -2643,11 +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) @@ -2660,6 +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 */ }