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gimp/app/core/gimpbrush-load.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpbrush-load.c
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gegl.h>
#include "libgimpbase/gimpbase.h"
#include "core-types.h"
#include "gimpbrush.h"
#include "gimpbrush-header.h"
#include "gimpbrush-load.h"
#include "gimpbrush-private.h"
#include "gimppattern-header.h"
#include "gimptempbuf.h"
#include "gimp-intl.h"
/* stuff from abr2gbr Copyright (C) 2001 Marco Lamberto <lm@sunnyspot.org> */
/* the above is GPL see http://the.sunnyspot.org/gimp/ */
typedef struct _AbrHeader AbrHeader;
typedef struct _AbrBrushHeader AbrBrushHeader;
typedef struct _AbrSampledBrushHeader AbrSampledBrushHeader;
struct _AbrHeader
{
gint16 version;
gint16 count;
};
struct _AbrBrushHeader
{
gint16 type;
gint32 size;
};
struct _AbrSampledBrushHeader
{
gint32 misc;
gint16 spacing;
gchar antialiasing;
gint16 bounds[4];
gint32 bounds_long[4];
gint16 depth;
gboolean wide;
};
/* local function prototypes */
static GList * gimp_brush_load_abr_v12 (GDataInputStream *input,
AbrHeader *abr_hdr,
GFile *file,
GError **error);
static GList * gimp_brush_load_abr_v6 (GDataInputStream *input,
AbrHeader *abr_hdr,
GFile *file,
GError **error);
static GimpBrush * gimp_brush_load_abr_brush_v12 (GDataInputStream *input,
AbrHeader *abr_hdr,
gint index,
GFile *file,
GError **error);
static GimpBrush * gimp_brush_load_abr_brush_v6 (GDataInputStream *input,
AbrHeader *abr_hdr,
gint32 max_offset,
gint index,
GFile *file,
GError **error);
static gchar abr_read_char (GDataInputStream *input,
GError **error);
static gint16 abr_read_short (GDataInputStream *input,
GError **error);
static gint32 abr_read_long (GDataInputStream *input,
GError **error);
static gchar * abr_read_ucs2_text (GDataInputStream *input,
GError **error);
static gboolean abr_supported (AbrHeader *abr_hdr,
GError **error);
static gboolean abr_reach_8bim_section (GDataInputStream *input,
const gchar *name,
GError **error);
static gboolean abr_rle_decode (GDataInputStream *input,
gchar *buffer,
gsize buffer_size,
gint32 height,
GError **error);
/* public functions */
GList *
gimp_brush_load (GimpContext *context,
GFile *file,
GInputStream *input,
GError **error)
{
GimpBrush *brush;
g_return_val_if_fail (G_IS_FILE (file), NULL);
g_return_val_if_fail (G_IS_INPUT_STREAM (input), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
brush = gimp_brush_load_brush (context, file, input, error);
if (! brush)
return NULL;
return g_list_prepend (NULL, brush);
}
GimpBrush *
gimp_brush_load_brush (GimpContext *context,
GFile *file,
GInputStream *input,
GError **error)
{
GimpBrush *brush;
gsize bn_size;
GimpBrushHeader header;
gchar *name = NULL;
guchar *mask;
gsize bytes_read;
gssize i, size;
gboolean success = TRUE;
g_return_val_if_fail (G_IS_FILE (file), NULL);
g_return_val_if_fail (G_IS_INPUT_STREAM (input), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
/* read the header */
if (! g_input_stream_read_all (input, &header, sizeof (header),
&bytes_read, NULL, error) ||
bytes_read != sizeof (header))
{
return NULL;
}
/* rearrange the bytes in each unsigned int */
header.header_size = g_ntohl (header.header_size);
header.version = g_ntohl (header.version);
header.width = g_ntohl (header.width);
header.height = g_ntohl (header.height);
header.bytes = g_ntohl (header.bytes);
header.magic_number = g_ntohl (header.magic_number);
header.spacing = g_ntohl (header.spacing);
/* Check for correct file format */
if (header.width == 0)
{
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
_("Fatal parse error in brush file: Width = 0."));
return NULL;
}
if (header.height == 0)
{
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
_("Fatal parse error in brush file: Height = 0."));
return NULL;
}
if (header.bytes == 0)
{
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
_("Fatal parse error in brush file: Bytes = 0."));
return NULL;
}
if (header.width > GIMP_BRUSH_MAX_SIZE ||
header.height > GIMP_BRUSH_MAX_SIZE ||
G_MAXSIZE / header.width / header.height / MAX (4, header.bytes) < 1)
{
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
_("Fatal parse error in brush file: %dx%d over max size."),
header.width, header.height);
return NULL;
}
switch (header.version)
{
case 1:
/* If this is a version 1 brush, set the fp back 8 bytes */
if (! g_seekable_seek (G_SEEKABLE (input), -8, G_SEEK_CUR,
NULL, error))
return NULL;
header.header_size += 8;
/* spacing is not defined in version 1 */
header.spacing = 25;
break;
case 3: /* cinepaint brush */
if (header.bytes == 18 /* FLOAT16_GRAY_GIMAGE */)
{
header.bytes = 2;
}
else
{
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
_("Fatal parse error in brush file: Unknown depth %d."),
header.bytes);
return NULL;
}
/* fallthrough */
case 2:
if (header.magic_number == GIMP_BRUSH_MAGIC)
break;
default:
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
_("Fatal parse error in brush file: Unknown version %d."),
header.version);
return NULL;
}
if (header.header_size < sizeof (GimpBrushHeader))
{
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
_("Unsupported brush format"));
return NULL;
}
/* Read in the brush name */
if ((bn_size = (header.header_size - sizeof (header))))
{
gchar *utf8;
if (bn_size > GIMP_BRUSH_MAX_NAME)
{
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
_("Invalid header data in '%s': "
"Brush name is too long: %lu"),
gimp_file_get_utf8_name (file),
(gulong) bn_size);
return NULL;
}
name = g_new0 (gchar, bn_size + 1);
if (! g_input_stream_read_all (input, name, bn_size,
&bytes_read, NULL, error) ||
bytes_read != bn_size)
{
g_free (name);
return NULL;
}
utf8 = gimp_any_to_utf8 (name, bn_size - 1,
_("Invalid UTF-8 string in brush file '%s'."),
gimp_file_get_utf8_name (file));
g_free (name);
name = utf8;
}
if (! name)
name = g_strdup (_("Unnamed"));
brush = g_object_new (GIMP_TYPE_BRUSH,
"name", name,
"mime-type", "image/x-gimp-gbr",
NULL);
g_free (name);
brush->priv->mask = gimp_temp_buf_new (header.width, header.height,
babl_format ("Y u8"));
mask = gimp_temp_buf_get_data (brush->priv->mask);
size = header.width * header.height * header.bytes;
switch (header.bytes)
{
case 1:
success = (g_input_stream_read_all (input, mask, size,
&bytes_read, NULL, error) &&
bytes_read == size);
/* For backwards-compatibility, check if a pattern follows.
* The obsolete .gpb format did it this way.
*/
if (success)
{
GimpPatternHeader ph;
goffset rewind;
rewind = g_seekable_tell (G_SEEKABLE (input));
if (g_input_stream_read_all (input, &ph, sizeof (GimpPatternHeader),
&bytes_read, NULL, NULL) &&
bytes_read == sizeof (GimpPatternHeader))
{
/* rearrange the bytes in each unsigned int */
ph.header_size = g_ntohl (ph.header_size);
ph.version = g_ntohl (ph.version);
ph.width = g_ntohl (ph.width);
ph.height = g_ntohl (ph.height);
ph.bytes = g_ntohl (ph.bytes);
ph.magic_number = g_ntohl (ph.magic_number);
if (ph.magic_number == GIMP_PATTERN_MAGIC &&
ph.version == 1 &&
ph.header_size > sizeof (GimpPatternHeader) &&
ph.bytes == 3 &&
ph.width == header.width &&
ph.height == header.height &&
g_input_stream_skip (input,
ph.header_size -
sizeof (GimpPatternHeader),
NULL, NULL) ==
ph.header_size - sizeof (GimpPatternHeader))
{
guchar *pixmap;
gssize pixmap_size;
brush->priv->pixmap =
gimp_temp_buf_new (header.width, header.height,
babl_format ("R'G'B' u8"));
pixmap = gimp_temp_buf_get_data (brush->priv->pixmap);
pixmap_size = gimp_temp_buf_get_data_size (brush->priv->pixmap);
success = (g_input_stream_read_all (input, pixmap,
pixmap_size,
&bytes_read, NULL,
error) &&
bytes_read == pixmap_size);
}
else
{
/* seek back if pattern wasn't found */
success = g_seekable_seek (G_SEEKABLE (input),
rewind, G_SEEK_SET,
NULL, error);
}
}
}
break;
case 2: /* cinepaint brush, 16 bit floats */
{
guchar buf[8 * 1024];
for (i = 0; success && i < size;)
{
gssize bytes = MIN (size - i, sizeof (buf));
success = (g_input_stream_read_all (input, buf, bytes,
&bytes_read, NULL, error) &&
bytes_read == bytes);
if (success)
{
guint16 *b = (guint16 *) buf;
i += bytes;
for (; bytes > 0; bytes -= 2, mask++, b++)
{
union
{
guint16 u[2];
gfloat f;
} short_float;
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
short_float.u[0] = 0;
short_float.u[1] = GUINT16_FROM_BE (*b);
#else
short_float.u[0] = GUINT16_FROM_BE (*b);
short_float.u[1] = 0;
#endif
*mask = (guchar) (short_float.f * 255.0 + 0.5);
}
}
}
}
break;
case 4:
{
guchar *pixmap;
guchar buf[8 * 1024];
brush->priv->pixmap = gimp_temp_buf_new (header.width, header.height,
babl_format ("R'G'B' u8"));
pixmap = gimp_temp_buf_get_data (brush->priv->pixmap);
for (i = 0; success && i < size;)
{
gssize bytes = MIN (size - i, sizeof (buf));
success = (g_input_stream_read_all (input, buf, bytes,
&bytes_read, NULL, error) &&
bytes_read == bytes);
if (success)
{
guchar *b = buf;
i += bytes;
for (; bytes > 0; bytes -= 4, pixmap += 3, mask++, b += 4)
{
pixmap[0] = b[0];
pixmap[1] = b[1];
pixmap[2] = b[2];
mask[0] = b[3];
}
}
}
}
break;
default:
g_object_unref (brush);
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
_("Fatal parse error in brush file:\n"
"Unsupported brush depth %d\n"
"GIMP brushes must be GRAY or RGBA."),
header.bytes);
return NULL;
}
if (! success)
{
g_object_unref (brush);
return NULL;
}
brush->priv->spacing = header.spacing;
brush->priv->x_axis.x = header.width / 2.0;
brush->priv->x_axis.y = 0.0;
brush->priv->y_axis.x = 0.0;
brush->priv->y_axis.y = header.height / 2.0;
return brush;
}
GList *
gimp_brush_load_abr (GimpContext *context,
GFile *file,
GInputStream *input,
GError **error)
{
GDataInputStream *data_input;
AbrHeader abr_hdr;
GList *brush_list = NULL;
GError *my_error = NULL;
g_return_val_if_fail (G_IS_FILE (file), NULL);
g_return_val_if_fail (G_IS_INPUT_STREAM (input), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
data_input = g_data_input_stream_new (input);
g_data_input_stream_set_byte_order (data_input,
G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN);
abr_hdr.version = abr_read_short (data_input, &my_error);
if (my_error)
goto done;
/* sub-version for ABR v6 */
abr_hdr.count = abr_read_short (data_input, &my_error);
if (my_error)
goto done;
if (abr_supported (&abr_hdr, &my_error))
{
switch (abr_hdr.version)
{
case 1:
case 2:
brush_list = gimp_brush_load_abr_v12 (data_input, &abr_hdr,
file, &my_error);
break;
case 6:
brush_list = gimp_brush_load_abr_v6 (data_input, &abr_hdr,
file, &my_error);
break;
}
}
done:
g_object_unref (data_input);
if (! brush_list)
{
if (! my_error)
g_set_error (&my_error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
_("Unable to decode abr format version %d."),
abr_hdr.version);
}
if (my_error)
g_propagate_error (error, my_error);
return g_list_reverse (brush_list);
}
/* private functions */
static GList *
gimp_brush_load_abr_v12 (GDataInputStream *input,
AbrHeader *abr_hdr,
GFile *file,
GError **error)
{
GList *brush_list = NULL;
gint i;
for (i = 0; i < abr_hdr->count; i++)
{
GimpBrush *brush;
GError *my_error = NULL;
brush = gimp_brush_load_abr_brush_v12 (input, abr_hdr, i,
file, &my_error);
/* a NULL brush without an error means an unsupported brush
* type was encountered, silently skip it and try the next one
*/
if (brush)
{
brush_list = g_list_prepend (brush_list, brush);
}
else if (my_error)
{
g_propagate_error (error, my_error);
break;
}
}
return brush_list;
}
static GList *
gimp_brush_load_abr_v6 (GDataInputStream *input,
AbrHeader *abr_hdr,
GFile *file,
GError **error)
{
GList *brush_list = NULL;
gint32 sample_section_size;
goffset sample_section_end;
gint i = 1;
if (! abr_reach_8bim_section (input, "samp", error))
return brush_list;
sample_section_size = abr_read_long (input, error);
if (error && *error)
return brush_list;
sample_section_end = (sample_section_size +
g_seekable_tell (G_SEEKABLE (input)));
while (g_seekable_tell (G_SEEKABLE (input)) < sample_section_end)
{
GimpBrush *brush;
GError *my_error = NULL;
brush = gimp_brush_load_abr_brush_v6 (input, abr_hdr, sample_section_end,
i, file, &my_error);
/* a NULL brush without an error means an unsupported brush
* type was encountered, silently skip it and try the next one
*/
if (brush)
{
brush_list = g_list_prepend (brush_list, brush);
}
else if (my_error)
{
g_propagate_error (error, my_error);
break;
}
i++;
}
return brush_list;
}
static GimpBrush *
gimp_brush_load_abr_brush_v12 (GDataInputStream *input,
AbrHeader *abr_hdr,
gint index,
GFile *file,
GError **error)
{
GimpBrush *brush = NULL;
AbrBrushHeader abr_brush_hdr;
abr_brush_hdr.type = abr_read_short (input, error);
if (error && *error)
return NULL;
abr_brush_hdr.size = abr_read_long (input, error);
if (error && *error)
return NULL;
if (abr_brush_hdr.size < 0)
{
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
_("Fatal parse error in brush file: "
"Brush size value corrupt."));
return NULL;
}
/* g_print(" + BRUSH\n | << type: %i block size: %i bytes\n",
* abr_brush_hdr.type, abr_brush_hdr.size);
*/
switch (abr_brush_hdr.type)
{
case 1: /* computed brush */
/* FIXME: support it!
*
* We can probabaly feed the info into the generated brush code
* and get a usable brush back. It seems to support the same
* types -akl
*/
g_printerr ("WARNING: computed brush unsupported, skipping.\n");
g_seekable_seek (G_SEEKABLE (input), abr_brush_hdr.size,
G_SEEK_CUR, NULL, NULL);
break;
case 2: /* sampled brush */
{
AbrSampledBrushHeader abr_sampled_brush_hdr;
gint width, height;
gint bytes;
gint size;
guchar *mask;
gint i;
gchar *name;
gchar *sample_name = NULL;
gchar *tmp;
gshort compress;
abr_sampled_brush_hdr.misc = abr_read_long (input, error);
if (error && *error)
break;
abr_sampled_brush_hdr.spacing = abr_read_short (input, error);
if (error && *error)
break;
if (abr_hdr->version == 2)
{
sample_name = abr_read_ucs2_text (input, error);
if (error && *error)
break;
}
abr_sampled_brush_hdr.antialiasing = abr_read_char (input, error);
if (error && *error)
break;
for (i = 0; i < 4; i++)
{
abr_sampled_brush_hdr.bounds[i] = abr_read_short (input, error);
if (error && *error)
break;
}
for (i = 0; i < 4; i++)
{
abr_sampled_brush_hdr.bounds_long[i] = abr_read_long (input, error);
if (error && *error)
break;
}
abr_sampled_brush_hdr.depth = abr_read_short (input, error);
if (error && *error)
break;
height = (abr_sampled_brush_hdr.bounds_long[2] -
abr_sampled_brush_hdr.bounds_long[0]); /* bottom - top */
width = (abr_sampled_brush_hdr.bounds_long[3] -
abr_sampled_brush_hdr.bounds_long[1]); /* right - left */
bytes = abr_sampled_brush_hdr.depth >> 3;
/* g_print ("width %i height %i bytes %i\n", width, height, bytes); */
if (width < 1 || width > 10000 ||
height < 1 || height > 10000 ||
bytes < 1 || bytes > 1 ||
G_MAXSIZE / width / height / bytes < 1)
{
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
_("Fatal parse error in brush file: "
"Brush dimensions out of range."));
break;
}
abr_sampled_brush_hdr.wide = height > 16384;
if (abr_sampled_brush_hdr.wide)
{
/* FIXME: support wide brushes */
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
_("Fatal parse error in brush file: "
"Wide brushes are not supported."));
break;
}
tmp = g_path_get_basename (gimp_file_get_utf8_name (file));
if (! sample_name)
{
/* build name from filename and index */
name = g_strdup_printf ("%s-%03d", tmp, index);
}
else
{
/* build name from filename and sample name */
name = g_strdup_printf ("%s-%s", tmp, sample_name);
g_free (sample_name);
}
g_free (tmp);
brush = g_object_new (GIMP_TYPE_BRUSH,
"name", name,
/* FIXME: MIME type!! */
"mime-type", "application/x-photoshop-abr",
NULL);
g_free (name);
brush->priv->spacing = abr_sampled_brush_hdr.spacing;
brush->priv->x_axis.x = width / 2.0;
brush->priv->x_axis.y = 0.0;
brush->priv->y_axis.x = 0.0;
brush->priv->y_axis.y = height / 2.0;
brush->priv->mask = gimp_temp_buf_new (width, height,
babl_format ("Y u8"));
mask = gimp_temp_buf_get_data (brush->priv->mask);
size = width * height * bytes;
compress = abr_read_char (input, error);
if (error && *error)
{
g_object_unref (brush);
brush = NULL;
break;
}
/* g_print(" | << size: %dx%d %d bit (%d bytes) %s\n",
* width, height, abr_sampled_brush_hdr.depth, size,
* comppres ? "compressed" : "raw");
*/
if (! compress)
{
gsize bytes_read;
if (! g_input_stream_read_all (G_INPUT_STREAM (input),
mask, size,
&bytes_read, NULL, error) ||
bytes_read != size)
{
g_object_unref (brush);
brush = NULL;
break;
}
}
else
{
if (! abr_rle_decode (input, (gchar *) mask, size, height, error))
{
g_object_unref (brush);
brush = NULL;
break;
}
}
}
break;
default:
g_printerr ("WARNING: unknown brush type, skipping.\n");
g_seekable_seek (G_SEEKABLE (input), abr_brush_hdr.size,
G_SEEK_CUR, NULL, NULL);
break;
}
return brush;
}
static GimpBrush *
gimp_brush_load_abr_brush_v6 (GDataInputStream *input,
AbrHeader *abr_hdr,
gint32 max_offset,
gint index,
GFile *file,
GError **error)
{
GimpBrush *brush = NULL;
guchar *mask;
gint32 brush_size;
gint32 brush_end;
goffset next_brush;
gint32 top, left, bottom, right;
gint16 depth;
gchar compress;
gint32 width, height;
gint32 size;
gchar *tmp;
gchar *name;
gboolean r;
brush_size = abr_read_long (input, error);
if (error && *error)
return NULL;
if (brush_size < 0)
{
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
_("Fatal parse error in brush file: "
"Brush size value corrupt."));
return NULL;
}
brush_end = brush_size;
/* complement to 4 */
while (brush_end % 4 != 0)
brush_end++;
next_brush = (brush_end + g_seekable_tell (G_SEEKABLE (input)));
if (abr_hdr->count == 1)
{
/* discard key and short coordinates and unknown short */
r = g_seekable_seek (G_SEEKABLE (input), 47, G_SEEK_CUR,
NULL, error);
}
else
{
/* discard key and unknown bytes */
r = g_seekable_seek (G_SEEKABLE (input), 301, G_SEEK_CUR,
NULL, error);
}
if (! r)
{
g_prefix_error (error,
_("Fatal parse error in brush file: "
"File appears truncated: "));
return NULL;
}
top = abr_read_long (input, error); if (error && *error) return NULL;
left = abr_read_long (input, error); if (error && *error) return NULL;
bottom = abr_read_long (input, error); if (error && *error) return NULL;
right = abr_read_long (input, error); if (error && *error) return NULL;
depth = abr_read_short (input, error); if (error && *error) return NULL;
compress = abr_read_char (input, error); if (error && *error) return NULL;
depth = depth >> 3;
width = right - left;
height = bottom - top;
size = width * depth * height;
#if 0
g_printerr ("width %i height %i depth %i compress %i\n",
width, height, depth, compress);
#endif
if (width < 1 || width > 10000 ||
height < 1 || height > 10000 ||
depth < 1 || depth > 1 ||
G_MAXSIZE / width / height / depth < 1)
{
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
_("Fatal parse error in brush file: "
"Brush dimensions out of range."));
return NULL;
}
if (compress < 0 || compress > 1)
{
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
_("Fatal parse error in brush file: "
"Unknown compression method."));
return NULL;
}
tmp = g_path_get_basename (gimp_file_get_utf8_name (file));
name = g_strdup_printf ("%s-%03d", tmp, index);
g_free (tmp);
brush = g_object_new (GIMP_TYPE_BRUSH,
"name", name,
/* FIXME: MIME type!! */
"mime-type", "application/x-photoshop-abr",
NULL);
g_free (name);
brush->priv->spacing = 25; /* real value needs 8BIMdesc section parser */
brush->priv->x_axis.x = width / 2.0;
brush->priv->x_axis.y = 0.0;
brush->priv->y_axis.x = 0.0;
brush->priv->y_axis.y = height / 2.0;
brush->priv->mask = gimp_temp_buf_new (width, height,
babl_format ("Y u8"));
mask = gimp_temp_buf_get_data (brush->priv->mask);
/* data decoding */
if (! compress)
{
/* not compressed - read raw bytes as brush data */
gsize bytes_read;
if (! g_input_stream_read_all (G_INPUT_STREAM (input),
mask, size,
&bytes_read, NULL, error) ||
bytes_read != size)
{
g_object_unref (brush);
return NULL;
}
}
else
{
if (! abr_rle_decode (input, (gchar *) mask, size, height, error))
{
g_object_unref (brush);
return NULL;
}
}
if (g_seekable_tell (G_SEEKABLE (input)) <= next_brush)
g_seekable_seek (G_SEEKABLE (input), next_brush, G_SEEK_SET,
NULL, NULL);
return brush;
}
static gchar
abr_read_char (GDataInputStream *input,
GError **error)
{
return g_data_input_stream_read_byte (input, NULL, error);
}
static gint16
abr_read_short (GDataInputStream *input,
GError **error)
{
return g_data_input_stream_read_int16 (input, NULL, error);
}
static gint32
abr_read_long (GDataInputStream *input,
GError **error)
{
return g_data_input_stream_read_int32 (input, NULL, error);
}
static gchar *
abr_read_ucs2_text (GDataInputStream *input,
GError **error)
{
gchar *name_ucs2;
gchar *name_utf8;
gint len;
gint i;
/* two-bytes characters encoded (UCS-2)
* format:
* long : number of characters in string
* data : zero terminated UCS-2 string
*/
len = 2 * abr_read_long (input, error);
if (len <= 0)
return NULL;
name_ucs2 = g_new (gchar, len);
for (i = 0; i < len; i++)
{
name_ucs2[i] = abr_read_char (input, error);
if (error && *error)
{
g_free (name_ucs2);
return NULL;
}
}
name_utf8 = g_convert (name_ucs2, len,
"UTF-8", "UCS-2BE",
NULL, NULL, NULL);
g_free (name_ucs2);
return name_utf8;
}
static gboolean
abr_supported (AbrHeader *abr_hdr,
GError **error)
{
switch (abr_hdr->version)
{
case 1:
case 2:
return TRUE;
break;
case 6:
/* in this case, count contains format sub-version */
if (abr_hdr->count == 1 || abr_hdr->count == 2)
return TRUE;
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
_("Fatal parse error in brush file: "
"Unable to decode abr format version %d."),
/* horrid subversion display, but better than
* having yet another translatable string for
* this
*/
abr_hdr->version * 10 + abr_hdr->count);
break;
}
return FALSE;
}
static gboolean
abr_reach_8bim_section (GDataInputStream *input,
const gchar *name,
GError **error)
{
while (TRUE)
{
gchar tag[4];
gchar tagname[5];
guint32 section_size;
gsize bytes_read;
if (! g_input_stream_read_all (G_INPUT_STREAM (input),
tag, 4,
&bytes_read, NULL, error) ||
bytes_read != 4)
return FALSE;
if (strncmp (tag, "8BIM", 4))
return FALSE;
if (! g_input_stream_read_all (G_INPUT_STREAM (input),
tagname, 4,
&bytes_read, NULL, error) ||
bytes_read != 4)
return FALSE;
tagname[4] = '\0';
if (! strncmp (tagname, name, 4))
return TRUE;
section_size = abr_read_long (input, error);
if (error && *error)
return FALSE;
if (! g_seekable_seek (G_SEEKABLE (input), section_size, G_SEEK_CUR,
NULL, error))
return FALSE;
}
return FALSE;
}
static gboolean
abr_rle_decode (GDataInputStream *input,
gchar *buffer,
gsize buffer_size,
gint32 height,
GError **error)
{
gchar ch;
gint i, j, c;
gshort *cscanline_len;
gchar *data = buffer;
/* read compressed size foreach scanline */
cscanline_len = g_new0 (gshort, height);
for (i = 0; i < height; i++)
{
cscanline_len[i] = abr_read_short (input, error);
if (error && *error)
{
g_free (cscanline_len);
return FALSE;
}
}
/* unpack each scanline data */
for (i = 0; i < height; i++)
{
for (j = 0; j < cscanline_len[i];)
{
gint32 n = abr_read_char (input, error);
if (error && *error)
{
g_free (cscanline_len);
return FALSE;
}
j++;
if (n >= 128) /* force sign */
n -= 256;
if (n < 0)
{
/* copy the following char -n + 1 times */
if (n == -128) /* it's a nop */
continue;
n = -n + 1;
ch = abr_read_char (input, error);
if (error && *error)
{
g_free (cscanline_len);
return FALSE;
}
j++;
for (c = 0; c < n; c++, data++)
{
if (data >= buffer + buffer_size)
{
g_free (cscanline_len);
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
_("Fatal parse error in brush file: "
"RLE compressed brush data corrupt."));
return FALSE;
}
*data = ch;
}
}
else
{
/* read the following n + 1 chars (no compr) */
for (c = 0; c < n + 1; c++, j++, data++)
{
if (data >= buffer + buffer_size)
{
g_free (cscanline_len);
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
_("Fatal parse error in brush file: "
"RLE compressed brush data corrupt."));
return FALSE;
}
*data = abr_read_char (input, error);
if (error && *error)
{
g_free (cscanline_len);
return FALSE;
}
}
}
}
}
g_free (cscanline_len);
return TRUE;
}
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