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kolibrios/programs/develop/libraries/libs-dev/libimg/png/libpng/pngset.asm
Ivan Baravy 263f2855f2 libimg: Add and export img.blend function 
git-svn-id: svn://kolibrios.org@8341 a494cfbc-eb01-0410-851d-a64ba20cac60
2020-12-08 17:40:34 +00:00

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; pngset.asm - storage of image information into info struct
; Last changed in libpng 1.6.24 [August 4, 2016]
; Copyright (c) 1998-2016 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.)
; This code is released under the libpng license.
; For conditions of distribution and use, see the disclaimer
; and license in png.inc
; The functions here are used during reads to store data from the file
; into the info struct, and during writes to store application data
; into the info struct for writing into the file. This abstracts the
; info struct and allows us to change the structure in the future.
;void (png_structrp png_ptr, png_inforp info_ptr, png_color_16p background)
align 4
proc png_set_bKGD uses ecx edi esi, png_ptr:dword, info_ptr:dword, background:dword
png_debug1 1, 'in %s storage function', 'bKGD'
cmp dword[png_ptr],0
je .end_f
mov edi,[info_ptr]
cmp edi,0
je .end_f
mov esi,[background]
cmp esi,0
je .end_f ;if (..==0 || ..==0 || ..==0) return
or dword[edi+png_info_def.valid],PNG_INFO_bKGD
add edi,png_info_def.background
mov ecx,sizeof.png_color_16
rep movsb
.end_f:
ret
endp
;void (png_structrp png_ptr, png_inforp info_ptr,
; png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
; png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
; png_fixed_point blue_x, png_fixed_point blue_y)
align 4
proc png_set_cHRM_fixed, png_ptr:dword, info_ptr:dword,\
white_x:dword, white_y:dword, red_x:dword, red_y:dword,\
green_x:dword, green_y:dword, blue_x:dword, blue_y:dword
; png_xy xy;
png_debug1 1, 'in %s storage function', 'cHRM fixed'
; if (png_ptr == NULL || info_ptr == NULL)
; return;
; xy.redx = red_x;
; xy.redy = red_y;
; xy.greenx = green_x;
; xy.greeny = green_y;
; xy.bluex = blue_x;
; xy.bluey = blue_y;
; xy.whitex = white_x;
; xy.whitey = white_y;
; if (png_colorspace_set_chromaticities(png_ptr, &info_ptr->colorspace, &xy,
; 2/* override with app values*/) != 0)
; info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM;
; png_colorspace_sync_info(png_ptr, info_ptr);
.end_f:
ret
endp
;void (png_structrp png_ptr, png_inforp info_ptr,
; png_fixed_point int_red_X, png_fixed_point int_red_Y,
; png_fixed_point int_red_Z, png_fixed_point int_green_X,
; png_fixed_point int_green_Y, png_fixed_point int_green_Z,
; png_fixed_point int_blue_X, png_fixed_point int_blue_Y,
; png_fixed_point int_blue_Z)
align 4
proc png_set_cHRM_XYZ_fixed uses edi esi, png_ptr:dword, info_ptr:dword,\
int_red_X:dword, int_red_Y:dword, int_red_Z:dword,\
int_green_X:dword, int_green_Y:dword, int_green_Z:dword,\
int_blue_X:dword, int_blue_Y:dword, int_blue_Z:dword
; png_XYZ XYZ;
png_debug1 1, 'in %s storage function', 'cHRM XYZ fixed'
mov edi,[png_ptr]
cmp edi,0
je .end_f
mov esi,[info_ptr]
cmp esi,0
je .end_f ;if (..==0 || ..==0) return
; XYZ.red_X = int_red_X;
; XYZ.red_Y = int_red_Y;
; XYZ.red_Z = int_red_Z;
; XYZ.green_X = int_green_X;
; XYZ.green_Y = int_green_Y;
; XYZ.green_Z = int_green_Z;
; XYZ.blue_X = int_blue_X;
; XYZ.blue_Y = int_blue_Y;
; XYZ.blue_Z = int_blue_Z;
; if (png_colorspace_set_endpoints(png_ptr, &info_ptr->colorspace,
; &XYZ, 2) != 0)
; info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM;
stdcall png_colorspace_sync_info, edi, esi
.end_f:
ret
endp
;void (png_structrp png_ptr, png_inforp info_ptr,
; double white_x, double white_y, double red_x, double red_y,
; double green_x, double green_y, double blue_x, double blue_y)
align 4
proc png_set_cHRM, png_ptr:dword, info_ptr:dword,\
white_x:dword, white_y:dword, red_x:dword, red_y:dword,\
green_x:dword, green_y:dword, blue_x:dword, blue_y:dword
; png_set_cHRM_fixed(png_ptr, info_ptr,
; png_fixed(png_ptr, white_x, "cHRM White X"),
; png_fixed(png_ptr, white_y, "cHRM White Y"),
; png_fixed(png_ptr, red_x, "cHRM Red X"),
; png_fixed(png_ptr, red_y, "cHRM Red Y"),
; png_fixed(png_ptr, green_x, "cHRM Green X"),
; png_fixed(png_ptr, green_y, "cHRM Green Y"),
; png_fixed(png_ptr, blue_x, "cHRM Blue X"),
; png_fixed(png_ptr, blue_y, "cHRM Blue Y"));
ret
endp
;void (png_structrp png_ptr, png_inforp info_ptr, double red_X,
; double red_Y, double red_Z, double green_X, double green_Y, double green_Z,
; double blue_X, double blue_Y, double blue_Z)
align 4
proc png_set_cHRM_XYZ, png_ptr:dword, info_ptr:dword, red_X:dword, red_Y:dword, red_Z:dword, green_X:dword, green_Y:dword, green_Z:dword, blue_X:dword, blue_Y:dword, blue_Z:dword
; png_set_cHRM_XYZ_fixed(png_ptr, info_ptr,
; png_fixed(png_ptr, red_X, "cHRM Red X"),
; png_fixed(png_ptr, red_Y, "cHRM Red Y"),
; png_fixed(png_ptr, red_Z, "cHRM Red Z"),
; png_fixed(png_ptr, green_X, "cHRM Green X"),
; png_fixed(png_ptr, green_Y, "cHRM Green Y"),
; png_fixed(png_ptr, green_Z, "cHRM Green Z"),
; png_fixed(png_ptr, blue_X, "cHRM Blue X"),
; png_fixed(png_ptr, blue_Y, "cHRM Blue Y"),
; png_fixed(png_ptr, blue_Z, "cHRM Blue Z"));
ret
endp
;void (png_structrp png_ptr, png_inforp info_ptr, png_fixed_point file_gamma)
align 4
proc png_set_gAMA_fixed uses eax edi esi, png_ptr:dword, info_ptr:dword, file_gamma:dword
png_debug1 1, 'in %s storage function', 'gAMA'
mov edi,[png_ptr]
cmp edi,0
je .end_f
mov esi,[info_ptr]
cmp esi,0
je .end_f ;if (..== 0 || ..== 0) return
mov eax,esi
add eax,png_info_def.colorspace
stdcall png_colorspace_set_gamma, edi, eax, [file_gamma]
stdcall png_colorspace_sync_info, edi, esi
.end_f:
ret
endp
;void (png_structrp png_ptr, png_inforp info_ptr, double file_gamma)
align 4
proc png_set_gAMA uses eax, png_ptr:dword, info_ptr:dword, file_gamma:dword
cStr ,'png_set_gAMA'
stdcall png_fixed, [png_ptr], [file_gamma], eax
stdcall png_set_gAMA_fixed, [png_ptr], [info_ptr], eax
ret
endp
;void (png_structrp png_ptr, png_inforp info_ptr, png_uint_16p hist)
align 4
proc png_set_hIST uses edi esi, png_ptr:dword, info_ptr:dword, hist:dword
; int i;
png_debug1 1, 'in %s storage function', 'hIST'
mov edi,[png_ptr]
cmp edi,0
je .end_f
mov esi,[info_ptr]
cmp esi,0
je .end_f ;if (..== 0 || ..== 0) return
; if (info_ptr->num_palette == 0 || info_ptr->num_palette
; > PNG_MAX_PALETTE_LENGTH)
; {
; png_warning(png_ptr,
; "Invalid palette size, hIST allocation skipped");
; return;
; }
; png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
; Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in
; version 1.2.1
; info_ptr->hist = png_malloc_warn(png_ptr,
; PNG_MAX_PALETTE_LENGTH * (sizeof (uint_16)));
; if (info_ptr->hist == NULL)
; {
; png_warning(png_ptr, "Insufficient memory for hIST chunk data");
; return;
; }
; info_ptr->free_me |= PNG_FREE_HIST;
; for (i = 0; i < info_ptr->num_palette; i++)
; info_ptr->hist[i] = hist[i];
or dword[esi+png_info_def.valid], PNG_INFO_hIST
.end_f:
ret
endp
;void (png_structrp png_ptr, png_inforp info_ptr,
; uint_32 width, uint_32 height, int bit_depth,
; int color_type, int interlace_type, int compression_type, int filter_type)
align 4
proc png_set_IHDR, png_ptr:dword, info_ptr:dword,\
width:dword, height:dword, bit_depth:dword, color_type:dword,\
interlace_type:dword, compression_type:dword, filter_type:dword
png_debug1 1, 'in %s storage function', 'IHDR'
pushad
mov edi,[png_ptr]
cmp edi,0
je .end_f
mov esi,[info_ptr]
cmp esi,0
je .end_f ;if (..== 0 || ..== 0) return
mov eax,[width]
mov [esi+png_info_def.width],eax
mov eax,[height]
mov [esi+png_info_def.height],eax
movzx eax,byte[filter_type]
mov [esi+png_info_def.filter_type],al
push eax
movzx eax,byte[compression_type]
mov [esi+png_info_def.compression_type],al
push eax
movzx eax,byte[interlace_type]
mov [esi+png_info_def.interlace_type],al
push eax
movzx ebx,byte[color_type]
mov [esi+png_info_def.color_type],bl
push ebx
movzx ecx,byte[bit_depth]
mov [esi+png_info_def.bit_depth],cl
stdcall png_check_IHDR, edi, dword[esi+png_info_def.width], dword[esi+png_info_def.height], ecx
;, color_type, interlace_type, compression_type, filter_type
cmp ebx,PNG_COLOR_TYPE_PALETTE
jne @f ;if (..==..)
mov byte[esi+png_info_def.channels], 1
jmp .end0
@@:
mov eax,ebx
and eax,PNG_COLOR_MASK_COLOR
cmp eax,0
je @f ;else if (..!=0)
mov byte[esi+png_info_def.channels], 3
jmp .end0
@@: ;else
mov byte[esi+png_info_def.channels], 1
.end0:
mov eax,ebx
and eax,PNG_COLOR_MASK_ALPHA
cmp eax,0
je @f ;else if (..!=0)
inc byte[esi+png_info_def.channels]
@@:
movzx eax,byte[esi+png_info_def.channels]
imul eax,ecx
mov byte[esi+png_info_def.pixel_depth],al ;channels * bit_depth
PNG_ROWBYTES eax, [width]
mov [esi+png_info_def.rowbytes], eax
.end_f:
popad
ret
endp
;if PNG_oFFs_SUPPORTED
;void (png_structrp png_ptr, png_inforp info_ptr,
; int_32 offset_x, int_32 offset_y, int unit_type)
align 4
proc png_set_oFFs uses eax esi, png_ptr:dword, info_ptr:dword, offset_x:dword, offset_y:dword, unit_type:dword
png_debug1 1, 'in %s storage function', 'oFFs'
cmp dword[png_ptr],0
je @f
mov esi,[info_ptr]
cmp esi,0
je @f ;if (..==0 || ..==0) return
mov eax,[offset_x]
mov [esi+png_info_def.x_offset],eax
mov eax,[offset_y]
mov [esi+png_info_def.y_offset],eax
mov al,[unit_type]
mov [esi+png_info_def.offset_unit_type],al
or dword[esi+png_info_def.valid], PNG_INFO_oFFs
@@:
ret
endp
;void (png_structrp png_ptr, png_inforp info_ptr,
; charp purpose, int_32 X0, int_32 X1, int type,
; int nparams, charp units, charpp params)
align 4
proc png_set_pCAL uses edi esi, png_ptr:dword, info_ptr:dword, purpose:dword, X0:dword, X1:dword, type:dword, nparams:dword, units:dword, params:dword
; png_size_t length;
; int i;
png_debug1 1, 'in %s storage function', 'pCAL'
mov edi,[png_ptr]
cmp edi,0
je .end_f
mov esi,[info_ptr]
cmp esi,0
je .end_f
cmp dword[purpose],0
je .end_f
cmp dword[units],0
je .end_f
cmp dword[nparams],0
jle @f
cmp dword[params],0
jne @f
jmp .end_f
@@: ;if (..==0 || ..==0 || ..==0 || ..==0 || (nparams > 0 && params == 0)) return
; length = strlen(purpose) + 1;
png_debug1 3, 'allocating purpose for info (%lu bytes)','(unsigned long)length'
; TODO: validate format of calibration name and unit name
; Check that the type matches the specification.
cmp dword[type],0
jl @f
cmp dword[type],3
jle .end0 ;if (..<0 || ..>3)
@@:
png_error edi, 'Invalid pCAL equation type'
.end0:
cmp dword[nparams],0
jl @f
cmp dword[nparams],255
jle .end1 ;if (..<0 || ..>255)
@@:
png_error edi, 'Invalid pCAL parameter count'
.end1:
; Validate params[nparams]
; for (i=0; i<nparams; ++i)
; {
; if (params[i] == NULL ||
; !png_check_fp_string(params[i], strlen(params[i])))
; png_error(png_ptr, "Invalid format for pCAL parameter");
; }
; info_ptr->pcal_purpose = png_malloc_warn(png_ptr, length);
; if (info_ptr->pcal_purpose == NULL)
; {
; png_warning(png_ptr, "Insufficient memory for pCAL purpose");
; return;
; }
; memcpy(info_ptr->pcal_purpose, purpose, length);
png_debug 3, 'storing X0, X1, type, and nparams in info'
; info_ptr->pcal_X0 = X0;
; info_ptr->pcal_X1 = X1;
; info_ptr->pcal_type = (byte)type;
; info_ptr->pcal_nparams = (byte)nparams;
; length = strlen(units) + 1;
png_debug1 3, 'allocating units for info (%lu bytes)','(unsigned long)length'
; info_ptr->pcal_units = png_malloc_warn(png_ptr, length);
; if (info_ptr->pcal_units == NULL)
; {
; png_warning(png_ptr, "Insufficient memory for pCAL units");
; return;
; }
; memcpy(info_ptr->pcal_units, units, length);
; info_ptr->pcal_params = png_malloc_warn(png_ptr,
; (png_size_t)((nparams + 1) * (sizeof (charp))));
; if (info_ptr->pcal_params == NULL)
; {
; png_warning(png_ptr, "Insufficient memory for pCAL params");
; return;
; }
; memset(info_ptr->pcal_params, 0, (nparams + 1) * (sizeof (charp)));
; for (i = 0; i < nparams; i++)
; {
; length = strlen(params[i]) + 1;
; png_debug2(3, "allocating parameter %d for info (%lu bytes)", i,
; (unsigned long)length);
; info_ptr->pcal_params[i] = (charp)png_malloc_warn(png_ptr, length);
; if (info_ptr->pcal_params[i] == NULL)
; {
; png_warning(png_ptr, "Insufficient memory for pCAL parameter");
; return;
; }
; memcpy(info_ptr->pcal_params[i], params[i], length);
; }
or dword[esi+png_info_def.valid],PNG_INFO_pCAL
or dword[esi+png_info_def.free_me],PNG_FREE_PCAL
.end_f:
ret
endp
;void (png_structrp png_ptr, png_inforp info_ptr,
; int unit, charp swidth, charp sheight)
align 4
proc png_set_sCAL_s, png_ptr:dword, info_ptr:dword, unit:dword, swidth:dword, sheight:dword
; png_size_t lengthw = 0, lengthh = 0;
png_debug1 1, 'in %s storage function', 'sCAL'
; if (png_ptr == NULL || info_ptr == NULL)
; return;
; Double check the unit (should never get here with an invalid
; unit unless this is an API call.)
; if (unit != 1 && unit != 2)
; png_error(png_ptr, "Invalid sCAL unit");
; if (swidth == NULL || (lengthw = strlen(swidth)) == 0 ||
; swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw))
; png_error(png_ptr, "Invalid sCAL width");
; if (sheight == NULL || (lengthh = strlen(sheight)) == 0 ||
; sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh))
; png_error(png_ptr, "Invalid sCAL height");
; info_ptr->scal_unit = (byte)unit;
; ++lengthw;
; png_debug1(3, "allocating unit for info (%u bytes)", (uint)lengthw);
; info_ptr->scal_s_width = png_malloc_warn(png_ptr, lengthw);
; if (info_ptr->scal_s_width == NULL)
; {
; png_warning(png_ptr, "Memory allocation failed while processing sCAL");
; return;
; }
; memcpy(info_ptr->scal_s_width, swidth, lengthw);
; ++lengthh;
; png_debug1(3, "allocating unit for info (%u bytes)", (uint)lengthh);
; info_ptr->scal_s_height = png_malloc_warn(png_ptr, lengthh);
; if (info_ptr->scal_s_height == NULL)
; {
; png_free (png_ptr, info_ptr->scal_s_width);
; info_ptr->scal_s_width = NULL;
; png_warning(png_ptr, "Memory allocation failed while processing sCAL");
; return;
; }
; memcpy(info_ptr->scal_s_height, sheight, lengthh);
;
; info_ptr->valid |= PNG_INFO_sCAL;
; info_ptr->free_me |= PNG_FREE_SCAL;
ret
endp
;void (png_structrp png_ptr, png_inforp info_ptr, int unit,
; double width, double height)
align 4
proc png_set_sCAL, png_ptr:dword, info_ptr:dword, unit:dword, width:dword, height:dword
png_debug1 1, 'in %s storage function', 'sCAL'
; Check the arguments.
; if (width <= 0)
; png_warning(png_ptr, "Invalid sCAL width ignored");
; else if (height <= 0)
; png_warning(png_ptr, "Invalid sCAL height ignored");
; else
; {
; Convert 'width' and 'height' to ASCII.
; char swidth[PNG_sCAL_MAX_DIGITS+1];
; char sheight[PNG_sCAL_MAX_DIGITS+1];
; png_ascii_from_fp(png_ptr, swidth, (sizeof swidth), width,
; PNG_sCAL_PRECISION);
; png_ascii_from_fp(png_ptr, sheight, (sizeof sheight), height,
; PNG_sCAL_PRECISION);
; png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
; }
ret
endp
;void (png_structrp png_ptr, png_inforp info_ptr, int unit,
; png_fixed_point width, png_fixed_point height)
align 4
proc png_set_sCAL_fixed uses ebx ecx edi, png_ptr:dword, info_ptr:dword, unit:dword, width:dword, height:dword
locals
swidth rb PNG_sCAL_MAX_DIGITS+1 ;char[]
sheight rb PNG_sCAL_MAX_DIGITS+1 ;char[]
endl
png_debug1 1, 'in %s storage function', 'sCAL'
mov edi,[png_ptr]
; Check the arguments.
cmp dword[width],0
jg @f ;if (..<=0)
png_warning edi, 'Invalid sCAL width ignored'
jmp .end0
@@:
cmp dword[height],0
jg @f ;else if (..<=0)
png_warning edi, 'Invalid sCAL height ignored'
jmp .end0
@@: ;else
; Convert 'width' and 'height' to ASCII.
mov ebx,ebp
sub ebx,PNG_sCAL_MAX_DIGITS+1 ;sheight
mov ecx,ebx
sub ecx,PNG_sCAL_MAX_DIGITS+1 ;swidth
stdcall png_ascii_from_fixed, edi, ecx, PNG_sCAL_MAX_DIGITS+1, [width]
stdcall png_ascii_from_fixed, edi, ebx, PNG_sCAL_MAX_DIGITS+1, [height]
stdcall png_set_sCAL_s, edi, [info_ptr], [unit], ecx, ebx
.end0:
ret
endp
;void (png_structrp png_ptr, png_inforp info_ptr,
; uint_32 res_x, uint_32 res_y, int unit_type)
align 4
proc png_set_pHYs, png_ptr:dword, info_ptr:dword, res_x:dword, res_y:dword, unit_type:dword
png_debug1 1, 'in %s storage function', 'pHYs'
; if (png_ptr == NULL || info_ptr == NULL)
; return;
; info_ptr->x_pixels_per_unit = res_x;
; info_ptr->y_pixels_per_unit = res_y;
; info_ptr->phys_unit_type = (byte)unit_type;
; info_ptr->valid |= PNG_INFO_pHYs;
ret
endp
;void (png_structrp png_ptr, png_inforp info_ptr, png_colorp palette, int num_palette)
align 4
proc png_set_PLTE uses eax edi esi, png_ptr:dword, info_ptr:dword, palette:dword, num_palette:dword
; uint_32 max_palette_length;
png_debug1 1, 'in %s storage function', 'PLTE'
mov edi,[png_ptr]
cmp edi,0
je .end_f
mov esi,[info_ptr]
cmp esi,0
je .end_f ;if (..==0 || ..==0) return
; max_palette_length = (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ?
; (1 << info_ptr->bit_depth) : PNG_MAX_PALETTE_LENGTH;
; if (num_palette < 0 || num_palette > (int) max_palette_length)
; {
; if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
; png_error(png_ptr, "Invalid palette length");
; else
; {
; png_warning(png_ptr, "Invalid palette length");
; return;
; }
; }
; if ((num_palette > 0 && palette == NULL) ||
; (num_palette == 0
if PNG_MNG_FEATURES_SUPPORTED eq 1
; && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0
end if
; ))
; {
; png_error(png_ptr, "Invalid palette");
; }
; It may not actually be necessary to set png_ptr->palette here;
; we do it for backward compatibility with the way the png_handle_tRNS
; function used to do the allocation.
; 1.6.0: the above statement appears to be incorrect; something has to set
; the palette inside png_struct on read.
stdcall png_free_data, edi, esi, PNG_FREE_PLTE, 0
; Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
; of num_palette entries, in case of an invalid PNG file or incorrect
; call to png_set_PLTE() with too-large sample values.
; png_ptr->palette = png_calloc(png_ptr,
; PNG_MAX_PALETTE_LENGTH * (sizeof (png_color)));
; if (num_palette > 0)
; memcpy(png_ptr->palette, palette, num_palette * (sizeof (png_color)));
mov eax,[edi+png_struct.palette]
mov [esi+png_info_def.palette],eax
; info_ptr->num_palette = png_ptr->num_palette = (uint_16)num_palette;
or dword[esi+png_info_def.free_me], PNG_FREE_PLTE
or dword[esi+png_info_def.valid], PNG_INFO_PLTE
.end_f:
ret
endp
;void (png_structrp png_ptr, png_inforp info_ptr, png_color_8p sig_bit)
align 4
proc png_set_sBIT, png_ptr:dword, info_ptr:dword, sig_bit:dword
png_debug1 1, 'in %s storage function', 'sBIT'
; if (png_ptr == NULL || info_ptr == NULL || sig_bit == NULL)
; return;
; info_ptr->sig_bit = *sig_bit;
; info_ptr->valid |= PNG_INFO_sBIT;
.end_f:
ret
endp
;void (png_structrp png_ptr, png_inforp info_ptr, int srgb_intent)
align 4
proc png_set_sRGB uses eax edi esi, png_ptr:dword, info_ptr:dword, srgb_intent:dword
png_debug1 1, 'in %s storage function', 'sRGB'
mov edi,[png_ptr]
cmp edi,0
je .end_f
mov esi,[info_ptr]
cmp esi,0
je .end_f ;if (..==0 || ..==0)
mov eax,esi
add eax,png_info_def.colorspace
stdcall png_colorspace_set_sRGB, edi, eax, [srgb_intent]
stdcall png_colorspace_sync_info, edi, esi
.end_f:
ret
endp
;void (png_structrp png_ptr, png_inforp info_ptr, int srgb_intent)
align 4
proc png_set_sRGB_gAMA_and_cHRM, png_ptr:dword, info_ptr:dword, srgb_intent:dword
png_debug1 1, 'in %s storage function', 'sRGB_gAMA_and_cHRM'
; if (png_ptr == NULL || info_ptr == NULL)
; return;
; if (png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace,
; srgb_intent) != 0)
; {
; This causes the gAMA and cHRM to be written too
; info_ptr->colorspace.flags |=
; PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
; }
; png_colorspace_sync_info(png_ptr, info_ptr);
.end_f:
ret
endp
;void (const_structrp png_ptr, png_inforp info_ptr,
; charp name, int compression_type, bytep profile, uint_32 proflen)
align 4
proc png_set_iCCP uses edi esi, png_ptr:dword, info_ptr:dword, name:dword, compression_type:dword, profile:dword, proflen:dword
; charp new_iccp_name;
; bytep new_iccp_profile;
; png_size_t length;
png_debug1 1, 'in %s storage function', 'iCCP'
mov esi,[info_ptr]
; if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
; return;
; if (compression_type != PNG_COMPRESSION_TYPE_BASE)
; png_app_error(png_ptr, "Invalid iCCP compression method");
; Set the colorspace first because this validates the profile; do not
; override previously set app cHRM or gAMA here (because likely as not the
; application knows better than libpng what the correct values are.) Pass
; the info_ptr color_type field to png_colorspace_set_ICC because in the
; write case it has not yet been stored in png_ptr.
; {
; int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name,
; proflen, profile, info_ptr->color_type);
; png_colorspace_sync_info(png_ptr, info_ptr);
; Don't do any of the copying if the profile was bad, or inconsistent.
; if (result == 0)
; return;
; But do write the gAMA and cHRM chunks from the profile.
; info_ptr->colorspace.flags |=
; PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
; }
; length = strlen(name)+1;
; new_iccp_name = png_malloc_warn(png_ptr, length);
; if (new_iccp_name == NULL)
; {
; png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk");
; return;
; }
; memcpy(new_iccp_name, name, length);
; new_iccp_profile = png_malloc_warn(png_ptr, proflen);
; if (new_iccp_profile == NULL)
; {
; png_free(png_ptr, new_iccp_name);
; png_benign_error(png_ptr,
; "Insufficient memory to process iCCP profile");
; return;
; }
; memcpy(new_iccp_profile, profile, proflen);
; png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
; info_ptr->iccp_proflen = proflen;
; info_ptr->iccp_name = new_iccp_name;
; info_ptr->iccp_profile = new_iccp_profile;
or dword[esi+png_info_def.free_me],PNG_FREE_ICCP
or dword[esi+png_info_def.valid],PNG_INFO_iCCP
ret
endp
;void (png_structrp png_ptr, png_inforp info_ptr, png_textp text_ptr, int num_text)
align 4
proc png_set_text uses eax edi, png_ptr:dword, info_ptr:dword, text_ptr:dword, num_text:dword
mov edi,[png_ptr]
stdcall png_set_text_2, edi, [info_ptr], [text_ptr], [num_text]
cmp eax,0
je @f ;if (..!=0)
png_error edi, 'Insufficient memory to store text'
@@:
ret
endp
;int (png_structrp png_ptr, png_inforp info_ptr,
; png_textp text_ptr, int num_text)
align 4
proc png_set_text_2, png_ptr:dword, info_ptr:dword, text_ptr:dword, num_text:dword
; int i;
png_debug1 1, 'in %lx storage function', 'png_ptr == NULL ? 0xabadca11 : (unsigned long)png_ptr->chunk_name'
; if (png_ptr == NULL || info_ptr == NULL || num_text <= 0 || text_ptr == NULL)
; return(0);
; Make sure we have enough space in the "text" array in info_struct
; to hold all of the incoming text_ptr objects. This compare can't overflow
; because max_text >= num_text (anyway, subtract of two positive integers
; can't overflow in any case.)
; if (num_text > info_ptr->max_text - info_ptr->num_text)
; {
; int old_num_text = info_ptr->num_text;
; int max_text;
; png_textp new_text = NULL;
; /* Calculate an appropriate max_text, checking for overflow. */
; max_text = old_num_text;
; if (num_text <= INT_MAX - max_text)
; {
; max_text += num_text;
; /* Round up to a multiple of 8 */
; if (max_text < INT_MAX-8)
; max_text = (max_text + 8) & ~0x7;
; else
; max_text = INT_MAX;
; Now allocate a new array and copy the old members in; this does all
; the overflow checks.
; new_text = png_realloc_array(png_ptr,
; info_ptr->text, old_num_text, max_text-old_num_text,
; sizeof *new_text);
; }
; if (new_text == NULL)
; {
; png_chunk_report(png_ptr, "too many text chunks",
; PNG_CHUNK_WRITE_ERROR);
; return 1;
; }
; png_free(png_ptr, info_ptr->text);
; info_ptr->text = new_text;
; info_ptr->free_me |= PNG_FREE_TEXT;
; info_ptr->max_text = max_text;
; /* num_text is adjusted below as the entries are copied in */
; png_debug1(3, "allocated %d entries for info_ptr->text", max_text);
; }
; for (i = 0; i < num_text; i++)
; {
; size_t text_length, key_len;
; size_t lang_len, lang_key_len;
; png_textp textp = &(info_ptr->text[info_ptr->num_text]);
; if (text_ptr[i].key == NULL)
; continue;
; if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE ||
; text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST)
; {
; png_chunk_report(png_ptr, "text compression mode is out of range",
; PNG_CHUNK_WRITE_ERROR);
; continue;
; }
; key_len = strlen(text_ptr[i].key);
; if (text_ptr[i].compression <= 0)
; {
; lang_len = 0;
; lang_key_len = 0;
; }
; else
if PNG_iTXt_SUPPORTED eq 1
; {
; /* Set iTXt data */
; if (text_ptr[i].lang != NULL)
; lang_len = strlen(text_ptr[i].lang);
;
; else
; lang_len = 0;
; if (text_ptr[i].lang_key != NULL)
; lang_key_len = strlen(text_ptr[i].lang_key);
; else
; lang_key_len = 0;
; }
else ;iTXt
; {
; png_chunk_report(png_ptr, "iTXt chunk not supported",
; PNG_CHUNK_WRITE_ERROR);
; continue;
; }
end if
; if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
; {
; text_length = 0;
if PNG_iTXt_SUPPORTED eq 1
; if (text_ptr[i].compression > 0)
; textp->compression = PNG_ITXT_COMPRESSION_NONE;
; else
end if
; textp->compression = PNG_TEXT_COMPRESSION_NONE;
; }
; else
; {
; text_length = strlen(text_ptr[i].text);
; textp->compression = text_ptr[i].compression;
; }
; textp->key = png_malloc_base(png_ptr,
; key_len + text_length + lang_len + lang_key_len + 4);
; if (textp->key == NULL)
; {
; png_chunk_report(png_ptr, "text chunk: out of memory",
; PNG_CHUNK_WRITE_ERROR);
; return 1;
; }
; png_debug2(2, "Allocated %lu bytes at %p in png_set_text",
; (unsigned long)(uint_32)
; (key_len + lang_len + lang_key_len + text_length + 4),
; textp->key);
; memcpy(textp->key, text_ptr[i].key, key_len);
; *(textp->key + key_len) = '\0';
; if (text_ptr[i].compression > 0)
; {
; textp->lang = textp->key + key_len + 1;
; memcpy(textp->lang, text_ptr[i].lang, lang_len);
; *(textp->lang + lang_len) = '\0';
; textp->lang_key = textp->lang + lang_len + 1;
; memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
; *(textp->lang_key + lang_key_len) = '\0';
; textp->text = textp->lang_key + lang_key_len + 1;
; }
; else
; {
; textp->lang=NULL;
; textp->lang_key=NULL;
; textp->text = textp->key + key_len + 1;
; }
; if (text_length != 0)
; memcpy(textp->text, text_ptr[i].text, text_length);
; *(textp->text + text_length) = '\0';
if PNG_iTXt_SUPPORTED eq 1
; if (textp->compression > 0)
; {
; textp->text_length = 0;
; textp->itxt_length = text_length;
; }
; else
end if
; {
; textp->text_length = text_length;
; textp->itxt_length = 0;
; }
; info_ptr->num_text++;
; png_debug1(3, "transferred text chunk %d", info_ptr->num_text);
; }
xor eax,eax
.end_f:
ret
endp
;void (png_structrp png_ptr, png_inforp info_ptr, png_timep mod_time)
align 4
proc png_set_tIME uses eax ebx ecx edi esi, png_ptr:dword, info_ptr:dword, mod_time:dword
png_debug1 1, 'in %s storage function', 'tIME'
mov ebx,[png_ptr]
cmp ebx,0
je .end_f
mov edi,[info_ptr]
cmp edi,0
je .end_f
mov esi,[mod_time]
cmp esi,0
je .end_f
mov eax,[ebx+png_struct.mode]
and eax,PNG_WROTE_tIME
cmp eax,0
jne .end_f ;if (..==0 || ..==0 || ..==0 || ..!=0) return
cmp byte[esi+png_time.month],0
je @f
cmp byte[esi+png_time.month],12
jg @f
cmp byte[esi+png_time.day],0
je @f
cmp byte[esi+png_time.day],31
jg @f
cmp byte[esi+png_time.hour],23
jg @f
cmp byte[esi+png_time.minute],59
jg @f
cmp byte[esi+png_time.second],60
jle .end0
@@: ;if (..==0 || ..>.. || ..==0 || ..>.. || ..>.. || ..>.. || ..>..)
png_warning ebx, 'Ignoring invalid time value'
jmp .end_f
.end0:
mov ecx,sizeof.png_time
push edi
add edi,png_info_def.mod_time
rep movsb
pop edi
or dword[edi+png_info_def.valid],PNG_INFO_tIME
.end_f:
ret
endp
;void (png_structrp png_ptr, png_inforp info_ptr,
; bytep trans_alpha, int num_trans, png_color_16p trans_color)
align 4
proc png_set_tRNS, png_ptr:dword, info_ptr:dword, trans_alpha:dword, num_trans:dword, trans_color:dword
png_debug1 1, 'in %s storage function', 'tRNS'
; if (png_ptr == NULL || info_ptr == NULL)
; return;
; if (trans_alpha != NULL)
; {
; It may not actually be necessary to set png_ptr->trans_alpha here;
; we do it for backward compatibility with the way the png_handle_tRNS
; function used to do the allocation.
; 1.6.0: The above statement is incorrect; png_handle_tRNS effectively
; relies on png_set_tRNS storing the information in png_struct
; (otherwise it won't be there for the code in pngrtran.c).
; png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
; if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
; {
; Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1
; info_ptr->trans_alpha = png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH);
; memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans);
; }
; png_ptr->trans_alpha = info_ptr->trans_alpha;
; }
; if (trans_color != NULL)
; {
if PNG_WARNINGS_SUPPORTED eq 1
; if (info_ptr->bit_depth < 16)
; {
; int sample_max = (1 << info_ptr->bit_depth) - 1;
;
; if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
; trans_color->gray > sample_max) ||
; (info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
; (trans_color->red > sample_max ||
; trans_color->green > sample_max ||
; trans_color->blue > sample_max)))
; png_warning(png_ptr,
; "tRNS chunk has out-of-range samples for bit_depth");
; }
end if
; info_ptr->trans_color = *trans_color;
; if (num_trans == 0)
; num_trans = 1;
; }
; info_ptr->num_trans = (uint_16)num_trans;
; if (num_trans != 0)
; {
; info_ptr->valid |= PNG_INFO_tRNS;
; info_ptr->free_me |= PNG_FREE_TRNS;
; }
ret
endp
;if PNG_sPLT_SUPPORTED
;void (png_structrp png_ptr,
; png_inforp info_ptr, png_sPLT_tp entries, int nentries)
; entries - array of png_sPLT_t structures
; to be added to the list of palettes
; in the info structure.
; nentries - number of palette structures to be
; added.
align 4
proc png_set_sPLT, png_ptr:dword, info_ptr:dword, entries:dword, nentries:dword
; png_sPLT_tp np;
; if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 || entries == NULL)
; return;
; Use the internal realloc function, which checks for all the possible
; overflows. Notice that the parameters are (int) and (size_t)
; np = png_realloc_array(png_ptr,
; info_ptr->splt_palettes, info_ptr->splt_palettes_num, nentries,
; sizeof *np);
; if (np == NULL)
; {
; /* Out of memory or too many chunks */
; png_chunk_report(png_ptr, "too many sPLT chunks", PNG_CHUNK_WRITE_ERROR);
; return;
; }
; png_free(png_ptr, info_ptr->splt_palettes);
; info_ptr->splt_palettes = np;
; info_ptr->free_me |= PNG_FREE_SPLT;
; np += info_ptr->splt_palettes_num;
; do
; {
; png_size_t length;
; /* Skip invalid input entries */
; if (entries->name == NULL || entries->entries == NULL)
; {
; /* png_handle_sPLT doesn't do this, so this is an app error */
; png_app_error(png_ptr, "png_set_sPLT: invalid sPLT");
; /* Just skip the invalid entry */
; continue;
; }
; np->depth = entries->depth;
; In the event of out-of-memory just return - there's no point keeping
; on trying to add sPLT chunks.
; length = strlen(entries->name) + 1;
; np->name = png_malloc_base(png_ptr, length);
; if (np->name == NULL)
; break;
; memcpy(np->name, entries->name, length);
; IMPORTANT: we have memory now that won't get freed if something else
; goes wrong; this code must free it. png_malloc_array produces no
; warnings; use a png_chunk_report (below) if there is an error.
; np->entries = png_malloc_array(png_ptr,
; entries->nentries, sizeof (png_sPLT_entry));
; if (np->entries == NULL)
; {
; png_free(png_ptr, np->name);
; np->name = NULL;
; break;
; }
; np->nentries = entries->nentries;
; This multiply can't overflow because png_malloc_array has already
; checked it when doing the allocation.
; memcpy(np->entries, entries->entries,
; entries->nentries * sizeof (png_sPLT_entry));
; Note that 'continue' skips the advance of the out pointer and out
; count, so an invalid entry is not added.
; info_ptr->valid |= PNG_INFO_sPLT;
; ++(info_ptr->splt_palettes_num);
; ++np;
; }
; while (++entries, --nentries);
; if (nentries > 0)
; png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR);
ret
endp
;end if /* sPLT */
;if PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
;byte (png_structrp png_ptr, int location)
align 4
proc check_location, png_ptr:dword, location:dword
; location &= (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT);
; New in 1.6.0; copy the location and check it. This is an API
; change; previously the app had to use the
; png_set_unknown_chunk_location API below for each chunk.
; if (location == 0 && (png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
; {
; /* Write struct, so unknown chunks come from the app */
; png_app_warning(png_ptr,
; "png_set_unknown_chunks now expects a valid location");
; /* Use the old behavior */
; location = (byte)(png_ptr->mode &
; (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT));
; }
; This need not be an internal error - if the app calls
; png_set_unknown_chunks on a read pointer it must get the location right.
; if (location == 0)
; png_error(png_ptr, "invalid location in png_set_unknown_chunks");
; Now reduce the location to the top-most set bit by removing each least
; significant bit in turn.
; while (location != (location & -location))
; location &= ~(location & -location);
; The cast is safe because 'location' is a bit mask and only the low four
; bits are significant.
; return (byte)location;
ret
endp
;void (png_structrp png_ptr,
; png_inforp info_ptr, png_unknown_chunkp unknowns, int num_unknowns)
align 4
proc png_set_unknown_chunks uses edi esi, png_ptr:dword, info_ptr:dword, unknowns:dword, num_unknowns:dword
; png_unknown_chunkp np;
mov edi,[png_ptr]
cmp edi,0
je .end_f
mov esi,[info_ptr]
cmp esi,0
je .end_f
cmp dword[num_unknowns],0
jle .end_f
cmp dword[unknowns],0
je .end_f ;if (..== 0 || ..== 0 || ..<=0 || ..==0) return
; Check for the failure cases where support has been disabled at compile
; time. This code is hardly ever compiled - it's here because
; STORE_UNKNOWN_CHUNKS is set by both read and write code (compiling in this
; code) but may be meaningless if the read or write handling of unknown
; chunks is not compiled in.
;# if !defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) && \
; defined(PNG_READ_SUPPORTED)
; if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
; {
; png_app_error(png_ptr, "no unknown chunk support on read");
;
; return;
; }
;# endif
;# if !defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) && \
; defined(PNG_WRITE_SUPPORTED)
; if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
; {
; png_app_error(png_ptr, "no unknown chunk support on write");
;
; return;
; }
;# endif
; Prior to 1.6.0 this code used png_malloc_warn; however, this meant that
; unknown critical chunks could be lost with just a warning resulting in
; undefined behavior. Now png_chunk_report is used to provide behavior
; appropriate to read or write.
; np = png_realloc_array(png_ptr,
; info_ptr->unknown_chunks, info_ptr->unknown_chunks_num, num_unknowns,
; sizeof *np);
; if (np == NULL)
; {
; png_chunk_report(png_ptr, "too many unknown chunks",
; PNG_CHUNK_WRITE_ERROR);
; return;
; }
; png_free(png_ptr, info_ptr->unknown_chunks);
; info_ptr->unknown_chunks = np; /* safe because it is initialized */
; info_ptr->free_me |= PNG_FREE_UNKN;
; np += info_ptr->unknown_chunks_num;
; Increment unknown_chunks_num each time round the loop to protect the
; just-allocated chunk data.
; for (; num_unknowns > 0; --num_unknowns, ++unknowns)
; {
; memcpy(np->name, unknowns->name, (sizeof np->name));
; np->name[(sizeof np->name)-1] = '\0';
; np->location = check_location(png_ptr, unknowns->location);
; if (unknowns->size == 0)
; {
; np->data = NULL;
; np->size = 0;
; }
; else
; {
; np->data = png_malloc_base(png_ptr, unknowns->size);
; if (np->data == NULL)
; {
; png_chunk_report(png_ptr, "unknown chunk: out of memory",
; PNG_CHUNK_WRITE_ERROR);
; /* But just skip storing the unknown chunk */
; continue;
; }
; memcpy(np->data, unknowns->data, unknowns->size);
; np->size = unknowns->size;
; }
; These increments are skipped on out-of-memory for the data - the
; unknown chunk entry gets overwritten if the png_chunk_report returns.
; This is correct in the read case (the chunk is just dropped.)
; ++np;
; ++(info_ptr->unknown_chunks_num);
; }
.end_f:
ret
endp
;void (png_structrp png_ptr, png_inforp info_ptr, int chunk, int location)
align 4
proc png_set_unknown_chunk_location, png_ptr:dword, info_ptr:dword, chunk:dword, location:dword
; This API is pretty pointless in 1.6.0 because the location can be set
; before the call to png_set_unknown_chunks.
; TODO: add a png_app_warning in 1.7
; if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 &&
; chunk < info_ptr->unknown_chunks_num)
; {
; if ((location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0)
; {
; png_app_error(png_ptr, "invalid unknown chunk location");
; Fake out the pre 1.6.0 behavior:
; if ((location & PNG_HAVE_IDAT) != 0) /* undocumented! */
; location = PNG_AFTER_IDAT;
; else
; location = PNG_HAVE_IHDR; /* also undocumented */
; }
; info_ptr->unknown_chunks[chunk].location =
; check_location(png_ptr, location);
; }
ret
endp
;end if /* STORE_UNKNOWN_CHUNKS */
;uint_32 (png_structrp png_ptr, uint_32 mng_features)
align 4
proc png_permit_mng_features, png_ptr:dword, mng_features:dword
png_debug 1, 'in png_permit_mng_features'
; if (png_ptr == NULL)
; return 0;
; png_ptr->mng_features_permitted = mng_features & PNG_ALL_MNG_FEATURES;
; return png_ptr->mng_features_permitted;
ret
endp
;if PNG_HANDLE_AS_UNKNOWN_SUPPORTED
;uint (bytep list, uint count, bytep add, int keep)
align 4
proc add_one_chunk, list:dword, count:dword, p3add:dword, keep:dword
; uint i;
; Utility function: update the 'keep' state of a chunk if it is already in
; the list, otherwise add it to the list.
; for (i=0; i<count; ++i, list += 5)
; {
; if (memcmp(list, p3add, 4) == 0)
; {
; list[4] = (byte)keep;
; return count;
; }
; }
; if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT)
; {
; ++count;
; memcpy(list, p3add, 4);
; list[4] = (byte)keep;
; }
; return count;
ret
endp
;void (png_structrp png_ptr, int keep, bytep chunk_list, int num_chunks_in)
align 4
proc png_set_keep_unknown_chunks uses edi, png_ptr:dword, keep:dword, chunk_list:dword, num_chunks_in:dword
; bytep new_list;
; uint num_chunks, old_num_chunks;
mov edi,[png_ptr]
cmp edi,0
je .end_f ;if (..== 0) return
; if (keep < 0 || keep >= PNG_HANDLE_CHUNK_LAST)
; {
; png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep");
; return;
; }
; if (num_chunks_in <= 0)
; {
; png_ptr->unknown_default = keep;
; '0' means just set the flags, so stop here
; if (num_chunks_in == 0)
; return;
; }
; if (num_chunks_in < 0)
; {
; Ignore all unknown chunks and all chunks recognized by
; libpng except for IHDR, PLTE, tRNS, IDAT, and IEND
; static byte chunks_to_ignore[] = {
; 98, 75, 71, 68, '\0', /* bKGD */
; 99, 72, 82, 77, '\0', /* cHRM */
; 103, 65, 77, 65, '\0', /* gAMA */
; 104, 73, 83, 84, '\0', /* hIST */
; 105, 67, 67, 80, '\0', /* iCCP */
; 105, 84, 88, 116, '\0', /* iTXt */
; 111, 70, 70, 115, '\0', /* oFFs */
; 112, 67, 65, 76, '\0', /* pCAL */
; 112, 72, 89, 115, '\0', /* pHYs */
; 115, 66, 73, 84, '\0', /* sBIT */
; 115, 67, 65, 76, '\0', /* sCAL */
; 115, 80, 76, 84, '\0', /* sPLT */
; 115, 84, 69, 82, '\0', /* sTER */
; 115, 82, 71, 66, '\0', /* sRGB */
; 116, 69, 88, 116, '\0', /* tEXt */
; 116, 73, 77, 69, '\0', /* tIME */
; 122, 84, 88, 116, '\0' /* zTXt */
; };
; chunk_list = chunks_to_ignore;
; num_chunks = (uint)/*SAFE*/(sizeof chunks_to_ignore)/5U;
; }
; else /* num_chunks_in > 0 */
; {
; if (chunk_list == NULL)
; {
; /* Prior to 1.6.0 this was silently ignored, now it is an app_error
; which can be switched off.
; png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list");
; return;
; }
; num_chunks = num_chunks_in;
; }
; old_num_chunks = png_ptr->num_chunk_list;
; if (png_ptr->chunk_list == NULL)
; old_num_chunks = 0;
; Since num_chunks is always restricted to UINT_MAX/5 this can't overflow.
; if (num_chunks + old_num_chunks > UINT_MAX/5)
; {
; png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks");
; return;
; }
; If these chunks are being reset to the default then no more memory is
; required because add_one_chunk above doesn't extend the list if the 'keep'
; parameter is the default.
; if (keep != 0)
; {
; new_list = png_malloc(png_ptr, 5 * (num_chunks + old_num_chunks));
;
; if (old_num_chunks > 0)
; memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks);
; }
; else if (old_num_chunks > 0)
; new_list = png_ptr->chunk_list;
; else
; new_list = NULL;
; Add the new chunks together with each one's handling code. If the chunk
; already exists the code is updated, otherwise the chunk is added to the
; end. (In libpng 1.6.0 order no longer matters because this code enforces
; the earlier convention that the last setting is the one that is used.)
; if (new_list != NULL)
; {
; bytep inlist;
; bytep outlist;
; uint i;
; for (i=0; i<num_chunks; ++i)
; {
; old_num_chunks = add_one_chunk(new_list, old_num_chunks,
; chunk_list+5*i, keep);
; }
; Now remove any spurious 'default' entries.
; num_chunks = 0;
; for (i=0, inlist=outlist=new_list; i<old_num_chunks; ++i, inlist += 5)
; {
; if (inlist[4])
; {
; if (outlist != inlist)
; memcpy(outlist, inlist, 5);
; outlist += 5;
; ++num_chunks;
; }
; }
; This means the application has removed all the specialized handling.
; if (num_chunks == 0)
; {
; if (png_ptr->chunk_list != new_list)
; png_free(png_ptr, new_list);
;
; new_list = NULL;
; }
; }
;
; else
; num_chunks = 0;
;
; png_ptr->num_chunk_list = num_chunks;
;
; if (png_ptr->chunk_list != new_list)
; {
; if (png_ptr->chunk_list != NULL)
; png_free(png_ptr, png_ptr->chunk_list);
;
; png_ptr->chunk_list = new_list;
; }
.end_f:
ret
endp
;end if
;void (png_structrp png_ptr, voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)
align 4
proc png_set_read_user_chunk_fn uses eax edi, png_ptr:dword, user_chunk_ptr:dword, read_user_chunk_fn:dword
png_debug 1, 'in png_set_read_user_chunk_fn'
mov edi,[png_ptr]
cmp edi,0
je .end_f
mov eax,[read_user_chunk_fn]
mov [edi+png_struct.read_user_chunk_fn],eax
mov eax,[user_chunk_ptr]
mov [edi+png_struct.user_chunk_ptr],eax
.end_f:
ret
endp
;void (png_structrp png_ptr, png_inforp info_ptr, bytepp row_pointers)
align 4
proc png_set_rows uses eax edi esi, png_ptr:dword, info_ptr:dword, row_pointers:dword
png_debug1 1, 'in %s storage function', 'rows'
mov edi,[png_ptr]
cmp edi,0
je .end_f
mov esi,[info_ptr]
cmp esi,0
je .end_f ;if (..==0 || ..==0) return
mov eax,[row_pointers]
cmp dword[esi+png_info_def.row_pointers],0
je @f
cmp [esi+png_info_def.row_pointers],eax
je @f ;if (..!=0 && ..!=..)
stdcall png_free_data, edi, esi, PNG_FREE_ROWS, 0
@@:
mov [esi+png_info_def.row_pointers],eax
cmp eax,0
je .end_f ;if (..!=0)
or dword[esi+png_info_def.valid],PNG_INFO_IDAT
.end_f:
ret
endp
;void (png_structrp png_ptr, png_size_t size)
align 4
proc png_set_compression_buffer_size uses edi, png_ptr:dword, size:dword
mov edi,[png_ptr]
cmp edi,0
je .end_f ;if (..==0) return
; if (size == 0 || size > PNG_UINT_31_MAX)
; png_error(png_ptr, "invalid compression buffer size");
if PNG_SEQUENTIAL_READ_SUPPORTED eq 1
; if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
; {
; png_ptr->IDAT_read_size = (uint_32)size; /* checked above */
; return;
; }
end if
if PNG_WRITE_SUPPORTED eq 1
; if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
; {
; if (png_ptr->zowner != 0)
; {
; png_warning(png_ptr,
; "Compression buffer size cannot be changed because it is in use");
; return;
; }
;#ifndef __COVERITY__
; Some compilers complain that this is always false. However, it
; can be true when integer overflow happens.
; if (size > ZLIB_IO_MAX)
; {
; png_warning(png_ptr,
; "Compression buffer size limited to system maximum");
; size = ZLIB_IO_MAX; /* must fit */
; }
;end if
; if (size < 6)
; {
; Deflate will potentially go into an infinite loop on a SYNC_FLUSH
; if this is permitted.
; png_warning(png_ptr,
; "Compression buffer size cannot be reduced below 6");
; return;
; }
; if (png_ptr->zbuffer_size != size)
; {
; png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list);
; png_ptr->zbuffer_size = (uInt)size;
; }
; }
end if
.end_f:
ret
endp
;void (png_structrp png_ptr, png_inforp info_ptr, int mask)
align 4
proc png_set_invalid, png_ptr:dword, info_ptr:dword, mask:dword
; if (png_ptr != NULL && info_ptr != NULL)
; info_ptr->valid &= ~mask;
ret
endp
; This function was added to libpng 1.2.6
;void (png_structrp png_ptr, uint_32 user_width_max, uint_32 user_height_max)
align 4
proc png_set_user_limits uses eax edi, png_ptr:dword, user_width_max:dword, user_height_max:dword
; Images with dimensions larger than these limits will be
; rejected by png_set_IHDR(). To accept any PNG datastream
; regardless of dimensions, set both limits to 0x7fffffff.
mov edi,[png_ptr]
cmp edi,0
je @f
mov eax,[user_width_max]
mov [edi+png_struct.user_width_max],eax
mov eax,[user_height_max]
mov [edi+png_struct.user_height_max],eax
@@:
ret
endp
; This function was added to libpng 1.4.0
;void (png_structrp png_ptr, uint_32 user_chunk_cache_max)
align 4
proc png_set_chunk_cache_max, png_ptr:dword, user_chunk_cache_max:dword
; if (png_ptr != NULL)
; png_ptr->user_chunk_cache_max = user_chunk_cache_max;
ret
endp
; This function was added to libpng 1.4.1
;void (png_structrp png_ptr, png_alloc_size_t user_chunk_malloc_max)
align 4
proc png_set_chunk_malloc_max, png_ptr:dword, user_chunk_malloc_max:dword
; if (png_ptr != NULL)
; png_ptr->user_chunk_malloc_max = user_chunk_malloc_max;
ret
endp
;void (png_structrp png_ptr, int allowed)
align 4
proc png_set_benign_errors uses edi, png_ptr:dword, allowed:dword
png_debug 1, 'in png_set_benign_errors'
; If allowed is 1, png_benign_error() is treated as a warning.
; If allowed is 0, png_benign_error() is treated as an error (which
; is the default behavior if png_set_benign_errors() is not called).
mov edi,[png_ptr]
cmp dword[allowed],0
je @f ;if (..!=0)
or dword[edi+png_struct.flags], PNG_FLAG_BENIGN_ERRORS_WARN or PNG_FLAG_APP_WARNINGS_WARN or PNG_FLAG_APP_ERRORS_WARN
jmp .end0
@@: ;else
and dword[edi+png_struct.flags], not (PNG_FLAG_BENIGN_ERRORS_WARN or PNG_FLAG_APP_WARNINGS_WARN or PNG_FLAG_APP_ERRORS_WARN)
.end0:
ret
endp
; Whether to report invalid palette index; added at libng-1.5.10.
; It is possible for an indexed (color-type==3) PNG file to contain
; pixels with invalid (out-of-range) indexes if the PLTE chunk has
; fewer entries than the image's bit-depth would allow. We recover
; from this gracefully by filling any incomplete palette with zeros
; (opaque black). By default, when this occurs libpng will issue
; a benign error. This API can be used to override that behavior.
;void (png_structrp png_ptr, int allowed)
align 4
proc png_set_check_for_invalid_index, png_ptr:dword, allowed:dword
png_debug 1, 'in png_set_check_for_invalid_index'
; if (allowed > 0)
; png_ptr->num_palette_max = 0;
; else
; png_ptr->num_palette_max = -1;
ret
endp
; Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification,
; and if invalid, correct the keyword rather than discarding the entire
; chunk. The PNG 1.0 specification requires keywords 1-79 characters in
; length, forbids leading or trailing whitespace, multiple internal spaces,
; and the non-break space (0x80) from ISO 8859-1. Returns keyword length.
; The 'new_key' buffer must be 80 characters in size (for the keyword plus a
; trailing '\0'). If this routine returns 0 then there was no keyword, or a
; valid one could not be generated, and the caller must png_error.
;uint_32 (png_structrp png_ptr, charp key, bytep new_key)
align 4
proc png_check_keyword, png_ptr:dword, key:dword, new_key:dword
;if PNG_WARNINGS_SUPPORTED
; charp orig_key = key;
;end if
; uint_32 key_len = 0;
; int bad_character = 0;
; int space = 1;
png_debug 1, 'in png_check_keyword'
; if (key == NULL)
; {
; *new_key = 0;
; return 0;
; }
; while (*key && key_len < 79)
; {
; byte ch = (byte)*key++;
; if ((ch > 32 && ch <= 126) || (ch >= 161 /*&& ch <= 255*/))
; *new_key++ = ch, ++key_len, space = 0;
; else if (space == 0)
; {
; A space or an invalid character when one wasn't seen immediately
; before; output just a space.
; *new_key++ = 32, ++key_len, space = 1;
; /* If the character was not a space then it is invalid. */
; if (ch != 32)
; bad_character = ch;
; }
; else if (bad_character == 0)
; bad_character = ch; /* just skip it, record the first error */
; }
; if (key_len > 0 && space != 0) /* trailing space */
; {
; --key_len, --new_key;
; if (bad_character == 0)
; bad_character = 32;
; }
; Terminate the keyword
; *new_key = 0;
; if (key_len == 0)
; return 0;
if PNG_WARNINGS_SUPPORTED eq 1
; Try to only output one warning per keyword:
; if (*key != 0) /* keyword too long */
; png_warning(png_ptr, "keyword truncated");
; else if (bad_character != 0)
; {
; PNG_WARNING_PARAMETERS(p)
; png_warning_parameter(p, 1, orig_key);
; png_warning_parameter_signed(p, 2, PNG_NUMBER_FORMAT_02x, bad_character);
; png_formatted_warning(png_ptr, p, "keyword \"@1\": bad character '0x@2'");
; }
end if ;!WARNINGS
; return key_len;
ret
endp
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