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file-png: Don't access inside PNG structs directly

This commit is contained in:
Mukund Sivaraman 2011-04-25 20:09:15 +05:30
parent e75cfd044a
commit f610aa4375
1 changed files with 45 additions and 30 deletions
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75
plug-ins/common/file-png.c
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@ -653,7 +653,7 @@ on_read_error (png_structp png_ptr, png_const_charp error_msg)
error_data->drawable->width, num);
}
longjmp (png_ptr->jmpbuf, 1);
longjmp (png_jmpbuf (png_ptr), 1);
}
/*
@ -697,7 +697,7 @@ load_image (const gchar *filename,
pp = png_create_read_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
info = png_create_info_struct (pp);
if (setjmp (pp->jmpbuf))
if (setjmp (png_jmpbuf (pp)))
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("Error while reading '%s'. File corrupted?"),
@ -738,17 +738,19 @@ load_image (const gchar *filename,
* Latest attempt, this should be my best yet :)
*/
if (info->bit_depth == 16)
if (png_get_bit_depth (pp, info) == 16)
{
png_set_strip_16 (pp);
}
if (info->color_type == PNG_COLOR_TYPE_GRAY && info->bit_depth < 8)
if (png_get_color_type (pp, info) == PNG_COLOR_TYPE_GRAY &&
png_get_bit_depth (pp, info) < 8)
{
png_set_expand (pp);
}
if (info->color_type == PNG_COLOR_TYPE_PALETTE && info->bit_depth < 8)
if (png_get_color_type (pp, info) == PNG_COLOR_TYPE_PALETTE &&
png_get_bit_depth (pp, info) < 8)
{
png_set_packing (pp);
}
@ -757,8 +759,8 @@ load_image (const gchar *filename,
* Expand G+tRNS to GA, RGB+tRNS to RGBA
*/
if (info->color_type != PNG_COLOR_TYPE_PALETTE &&
(info->valid & PNG_INFO_tRNS))
if (png_get_color_type (pp, info) != PNG_COLOR_TYPE_PALETTE &&
png_get_valid (pp, info, PNG_INFO_tRNS))
{
png_set_expand (pp);
}
@ -775,7 +777,7 @@ load_image (const gchar *filename,
*/
if (png_get_valid (pp, info, PNG_INFO_tRNS) &&
info->color_type == PNG_COLOR_TYPE_PALETTE)
png_get_color_type (pp, info) == PNG_COLOR_TYPE_PALETTE)
{
png_get_tRNS (pp, info, &alpha_ptr, &num, NULL);
/* Copy the existing alpha values from the tRNS chunk */
@ -797,7 +799,7 @@ load_image (const gchar *filename,
png_read_update_info (pp, info);
switch (info->color_type)
switch (png_get_color_type (pp, info))
{
case PNG_COLOR_TYPE_RGB: /* RGB */
bpp = 3;
@ -836,7 +838,9 @@ load_image (const gchar *filename,
return -1;
}
image = gimp_image_new (info->width, info->height, image_type);
image = gimp_image_new (png_get_image_width (pp, info),
png_get_image_height (pp, info),
image_type);
if (image == -1)
{
g_set_error (error, 0, 0,
@ -849,7 +853,9 @@ load_image (const gchar *filename,
* Create the "background" layer to hold the image...
*/
layer = gimp_layer_new (image, _("Background"), info->width, info->height,
layer = gimp_layer_new (image, _("Background"),
png_get_image_width (pp, info),
png_get_image_height (pp, info),
layer_type, 100, GIMP_NORMAL_MODE);
gimp_image_insert_layer (image, layer, -1, 0);
@ -883,7 +889,8 @@ load_image (const gchar *filename,
gimp_layer_set_offsets (layer, offset_x, offset_y);
if ((abs (offset_x) > info->width) || (abs (offset_y) > info->height))
if ((abs (offset_x) > png_get_image_width (pp, info)) ||
(abs (offset_y) > png_get_image_height (pp, info)))
{
if (interactive)
g_message (_("The PNG file specifies an offset that caused "
@ -938,23 +945,27 @@ load_image (const gchar *filename,
empty = 0; /* by default assume no full transparent palette entries */
if (info->color_type & PNG_COLOR_MASK_PALETTE)
if (png_get_color_type (pp, info) & PNG_COLOR_MASK_PALETTE)
{
png_colorp palette;
int num_palette;
png_get_PLTE (pp, info, &palette, &num_palette);
if (png_get_valid (pp, info, PNG_INFO_tRNS))
{
for (empty = 0; empty < 256 && alpha[empty] == 0; ++empty)
/* Calculates number of fully transparent "empty" entries */;
/* keep at least one entry */
empty = MIN (empty, info->num_palette - 1);
empty = MIN (empty, num_palette - 1);
gimp_image_set_colormap (image, (guchar *) (info->palette + empty),
info->num_palette - empty);
gimp_image_set_colormap (image, (guchar *) (palette + empty),
num_palette - empty);
}
else
{
gimp_image_set_colormap (image, (guchar *) info->palette,
info->num_palette);
gimp_image_set_colormap (image, (guchar *) palette,
num_palette);
}
}
@ -972,18 +983,19 @@ load_image (const gchar *filename,
*/
tile_height = gimp_tile_height ();
pixel = g_new0 (guchar, tile_height * info->width * bpp);
pixel = g_new0 (guchar, tile_height * png_get_image_width (pp, info) * bpp);
pixels = g_new (guchar *, tile_height);
for (i = 0; i < tile_height; i++)
pixels[i] = pixel + info->width * info->channels * i;
pixels[i] = pixel + png_get_image_width (pp, info) *
png_get_channels (pp, info) * i;
/* Install our own error handler to handle incomplete PNG files better */
error_data.drawable = drawable;
error_data.pixel = pixel;
error_data.tile_height = tile_height;
error_data.width = info->width;
error_data.height = info->height;
error_data.width = png_get_image_width (pp, info);
error_data.height = png_get_image_height (pp, info);
error_data.bpp = bpp;
error_data.pixel_rgn = &pixel_rgn;
@ -996,10 +1008,11 @@ load_image (const gchar *filename,
*/
for (begin = 0, end = tile_height;
begin < info->height; begin += tile_height, end += tile_height)
begin < png_get_image_height (pp, info);
begin += tile_height, end += tile_height)
{
if (end > info->height)
end = info->height;
if (end > png_get_image_height (pp, info))
end = png_get_image_height (pp, info);
num = end - begin;
@ -1016,11 +1029,13 @@ load_image (const gchar *filename,
gimp_pixel_rgn_set_rect (&pixel_rgn, pixel, 0, begin,
drawable->width, num);
memset (pixel, 0, tile_height * info->width * bpp);
memset (pixel, 0,
tile_height * png_get_image_width (pp, info) * bpp);
gimp_progress_update (((gdouble) pass +
(gdouble) end / (gdouble) info->height) /
(gdouble) num_passes);
gimp_progress_update
(((gdouble) pass +
(gdouble) end / (gdouble) png_get_image_height (pp, info)) /
(gdouble) num_passes);
}
}
@ -1249,7 +1264,7 @@ save_image (const gchar *filename,
pp = png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
info = png_create_info_struct (pp);
if (setjmp (pp->jmpbuf))
if (setjmp (png_jmpbuf (pp)))
{
g_set_error (error, 0, 0,
_("Error while saving '%s'. Could not save image."),