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gtk/gdk-pixbuf/gdk-pixbuf-io.c
Sven Neumann 40c2926482 gdk-pixbuf/gdk-pixbuf-io.c gdk-pixbuf/gdk-pixbuf-private.h 
2001-10-05  Sven Neumann  <sven@gimp.org>

	* gdk-pixbuf/gdk-pixbuf-io.c
	* gdk-pixbuf/gdk-pixbuf-private.h
	* gdk-pixbuf/gdk-pixbuf.c
	* gdk-pixbuf/gdk-pixbuf.h
	* gdk-pixbuf/io-jpeg.c
	* gdk-pixbuf/io-png.c: changed GDK_PIXBUF_ERROR_BAD_OPTION_VALUE to
	GDK_PIXBUF_ERROR_BAD_OPTION to we can use it for bad keys too. Added
	new public API gdk_pixbuf_get_option() to retrieve key/value pairs
	set by an image loader. Added support for saving and reading PNG tEXt
	chunks in PNG images.

	* demos/testpixbuf-save.c
	* demos/testpixbuf-scale.c: simple tests for the new PNG tEXt chunk
	feature.

	* gdk-pixbuf/tmpl/gdk-pixbuf.sgml: adapt to changes in GDK_PIXBUF_ERROR
	enum.
2001-10-05 18:51:47 +00:00

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/* GdkPixbuf library - Main loading interface.
*
* Copyright (C) 1999 The Free Software Foundation
*
* Authors: Miguel de Icaza <miguel@gnu.org>
* Federico Mena-Quintero <federico@gimp.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <config.h>
#include <string.h>
#include <glib.h>
#include <errno.h>
#include "gdk-pixbuf-private.h"
#include "gdk-pixbuf-io.h"
static gboolean
pixbuf_check_png (guchar *buffer, int size)
{
if (size < 28)
return FALSE;
if (buffer [0] != 0x89 ||
buffer [1] != 'P' ||
buffer [2] != 'N' ||
buffer [3] != 'G' ||
buffer [4] != 0x0d ||
buffer [5] != 0x0a ||
buffer [6] != 0x1a ||
buffer [7] != 0x0a)
return FALSE;
return TRUE;
}
static gboolean
pixbuf_check_jpeg (guchar *buffer, int size)
{
if (size < 10)
return FALSE;
if (buffer [0] != 0xff || buffer [1] != 0xd8)
return FALSE;
return TRUE;
}
static gboolean
pixbuf_check_tiff (guchar *buffer, int size)
{
if (size < 10)
return FALSE;
if (buffer [0] == 'M' &&
buffer [1] == 'M' &&
buffer [2] == 0 &&
buffer [3] == 0x2a)
return TRUE;
if (buffer [0] == 'I' &&
buffer [1] == 'I' &&
buffer [2] == 0x2a &&
buffer [3] == 0)
return TRUE;
return FALSE;
}
static gboolean
pixbuf_check_gif (guchar *buffer, int size)
{
if (size < 20)
return FALSE;
if (strncmp (buffer, "GIF8", 4) == 0)
return TRUE;
return FALSE;
}
static gboolean
pixbuf_check_xpm (guchar *buffer, int size)
{
if (size < 20)
return FALSE;
if (strncmp (buffer, "/* XPM */", 9) == 0)
return TRUE;
return FALSE;
}
static gboolean
pixbuf_check_pnm (guchar *buffer, int size)
{
if (size < 20)
return FALSE;
if (buffer [0] == 'P') {
if (buffer [1] == '1' ||
buffer [1] == '2' ||
buffer [1] == '3' ||
buffer [1] == '4' ||
buffer [1] == '5' ||
buffer [1] == '6')
return TRUE;
}
return FALSE;
}
static gboolean
pixbuf_check_sunras (guchar *buffer, int size)
{
if (size < 32)
return FALSE;
if (buffer [0] != 0x59 ||
buffer [1] != 0xA6 ||
buffer [2] != 0x6A ||
buffer [3] != 0x95)
return FALSE;
return TRUE;
}
static gboolean
pixbuf_check_ico (guchar *buffer, int size)
{
/* Note that this may cause false positives, but .ico's don't
have a magic number.*/
if (size < 6)
return FALSE;
if (buffer [0] != 0x0 ||
buffer [1] != 0x0 ||
((buffer [2] != 0x1)&&(buffer[2]!=0x2)) ||
buffer [3] != 0x0 ||
buffer [5] != 0x0 )
return FALSE;
return TRUE;
}
static gboolean
pixbuf_check_bmp (guchar *buffer, int size)
{
if (size < 20)
return FALSE;
if (buffer [0] != 'B' || buffer [1] != 'M')
return FALSE;
return TRUE;
}
static gboolean
pixbuf_check_wbmp (guchar *buffer, int size)
{
if(size < 10) /* at least */
return FALSE;
if(buffer[0] == '\0' /* We only handle type 0 wbmp's for now */)
return TRUE;
return FALSE;
}
static gboolean
pixbuf_check_xbm (guchar *buffer, int size)
{
if (size < 20)
return FALSE;
if (buffer [0] != '#'
|| buffer [1] != 'd'
|| buffer [2] != 'e'
|| buffer [3] != 'f'
|| buffer [4] != 'i'
|| buffer [5] != 'n'
|| buffer [6] != 'e'
|| buffer [7] != ' ')
return FALSE;
return TRUE;
}
static gboolean
pixbuf_check_tga (guchar *buffer, int size)
{
if (size < 18)
return FALSE;
/* buffer[1] is a boolean telling if in the file a colormap is
present, while buffer[2] is the byte which specifies the image
type. (GrayScale/PseudoColor/TrueColor/RLE) */
if ((buffer[2] == 1) || (buffer[2] == 9)) {
if (buffer[1] != 1)
return FALSE;
} else {
if (buffer[1] != 0)
return FALSE;
}
return TRUE;
}
static GdkPixbufModule file_formats [] = {
{ "png", pixbuf_check_png, NULL, NULL, NULL, NULL, NULL, NULL, NULL, },
{ "jpeg", pixbuf_check_jpeg, NULL, NULL, NULL, NULL, NULL, NULL, NULL },
{ "tiff", pixbuf_check_tiff, NULL, NULL, NULL, NULL, NULL, NULL, NULL },
{ "gif", pixbuf_check_gif, NULL, NULL, NULL, NULL, NULL, NULL, NULL },
#define XPM_FILE_FORMAT_INDEX 4
{ "xpm", pixbuf_check_xpm, NULL, NULL, NULL, NULL, NULL, NULL, NULL },
{ "pnm", pixbuf_check_pnm, NULL, NULL, NULL, NULL, NULL, NULL, NULL },
{ "ras", pixbuf_check_sunras, NULL, NULL, NULL, NULL, NULL, NULL, NULL },
{ "bmp", pixbuf_check_bmp, NULL, NULL, NULL, NULL, NULL, NULL, NULL },
{ "xbm", pixbuf_check_xbm, NULL, NULL, NULL, NULL, NULL, NULL, NULL },
{ "tga", pixbuf_check_tga, NULL, NULL, NULL, NULL, NULL, NULL, NULL },
/* Moved at the bottom, because it causes false positives against many
of my TGA files. */
{ "ico", pixbuf_check_ico, NULL, NULL, NULL, NULL, NULL, NULL, NULL },
{ "wbmp", pixbuf_check_wbmp, NULL, NULL, NULL, NULL, NULL, NULL, NULL },
{ NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }
};
#ifdef USE_GMODULE
static gboolean
pixbuf_module_symbol (GModule *module, const char *module_name, const char *symbol_name, gpointer *symbol)
{
char *full_symbol_name = g_strconcat ("gdk_pixbuf__", module_name, "_", symbol_name, NULL);
gboolean return_value;
return_value = g_module_symbol (module, full_symbol_name, symbol);
g_free (full_symbol_name);
return return_value;
}
#ifdef G_OS_WIN32
static char *
get_libdir (void)
{
static char *libdir = NULL;
if (libdir == NULL)
libdir = g_win32_get_package_installation_subdirectory
(GETTEXT_PACKAGE,
g_strdup_printf ("gdk_pixbuf-%d.%d.dll",
GDK_PIXBUF_MAJOR, GDK_PIXBUF_MINOR),
"loaders");
return libdir;
}
#define PIXBUF_LIBDIR get_libdir ()
#endif
/* actually load the image handler - gdk_pixbuf_get_module only get a */
/* reference to the module to load, it doesn't actually load it */
/* perhaps these actions should be combined in one function */
gboolean
_gdk_pixbuf_load_module (GdkPixbufModule *image_module,
GError **error)
{
char *module_name;
char *path;
GModule *module;
gpointer sym;
char *name;
gboolean retval;
const char *dir;
g_return_val_if_fail (image_module->module == NULL, FALSE);
name = image_module->module_name;
module_name = g_strconcat ("pixbufloader-", name, NULL);
/* This would be an exploit in an suid binary using gdk-pixbuf,
* but see http://www.gtk.org/setuid.html or the BugTraq
* archives for why you should report this as a bug against
* setuid apps using this library rather than the library
* itself.
*/
dir = g_getenv ("GDK_PIXBUF_MODULEDIR");
if (dir == NULL || *dir == '\0') {
path = g_module_build_path (PIXBUF_LIBDIR, module_name);
module = g_module_open (path, G_MODULE_BIND_LAZY);
} else {
path = g_module_build_path (dir, module_name);
module = g_module_open (path, G_MODULE_BIND_LAZY);
}
if (!module) {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_FAILED,
_("Unable to load image-loading module: %s: %s"),
path, g_module_error ());
g_free (module_name);
g_free (path);
return FALSE;
}
g_free (module_name);
image_module->module = module;
if (pixbuf_module_symbol (module, name, "fill_vtable", &sym)) {
ModuleFillVtableFunc func = sym;
(* func) (image_module);
retval = TRUE;
} else {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_FAILED,
_("Image-loading module %s does not export the proper interface; perhaps it's from a different GTK version?"),
path);
retval = FALSE;
}
g_free (path);
return retval;
}
#else
#define mname(type,fn) gdk_pixbuf__ ## type ## _ ##fn
#define m_fill_vtable(type) extern void mname(type,fill_vtable) (GdkPixbufModule *module)
m_fill_vtable (png);
m_fill_vtable (bmp);
m_fill_vtable (wbmp);
m_fill_vtable (gif);
m_fill_vtable (ico);
m_fill_vtable (jpeg);
m_fill_vtable (pnm);
m_fill_vtable (ras);
m_fill_vtable (tiff);
m_fill_vtable (xpm);
m_fill_vtable (xbm);
m_fill_vtable (tga);
gboolean
_gdk_pixbuf_load_module (GdkPixbufModule *image_module,
GError **error)
{
ModuleFillVtableFunc fill_vtable = NULL;
image_module->module = (void *) 1;
if (FALSE) {
/* Ugly hack so we can use else if unconditionally below ;-) */
}
#ifdef INCLUDE_png
else if (strcmp (image_module->module_name, "png") == 0){
fill_vtable = mname (png, fill_vtable);
}
#endif
#ifdef INCLUDE_bmp
else if (strcmp (image_module->module_name, "bmp") == 0){
fill_vtable = mname (bmp, fill_vtable);
}
#endif
#ifdef INCLUDE_wbmp
else if (strcmp (image_module->module_name, "wbmp") == 0){
fill_vtable = mname (wbmp, fill_vtable);
}
#endif
#ifdef INCLUDE_gif
else if (strcmp (image_module->module_name, "gif") == 0){
fill_vtable = mname (gif, fill_vtable);
}
#endif
#ifdef INCLUDE_ico
else if (strcmp (image_module->module_name, "ico") == 0){
fill_vtable = mname (ico, fill_vtable);
}
#endif
#ifdef INCLUDE_jpeg
else if (strcmp (image_module->module_name, "jpeg") == 0){
fill_vtable = mname (jpeg, fill_vtable);
}
#endif
#ifdef INCLUDE_pnm
else if (strcmp (image_module->module_name, "pnm") == 0){
fill_vtable = mname (pnm, fill_vtable);
}
#endif
#ifdef INCLUDE_ras
else if (strcmp (image_module->module_name, "ras") == 0){
fill_vtable = mname (ras, fill_vtable);
}
#endif
#ifdef INCLUDE_tiff
else if (strcmp (image_module->module_name, "tiff") == 0){
fill_vtable = mname (tiff, fill_vtable);
}
#endif
#ifdef INCLUDE_xpm
else if (strcmp (image_module->module_name, "xpm") == 0){
fill_vtable = mname (xpm, fill_vtable);
}
#endif
#ifdef INCLUDE_xbm
else if (strcmp (image_module->module_name, "xbm") == 0){
fill_vtable = mname (xbm, fill_vtable);
}
#endif
#ifdef INCLUDE_tga
else if (strcmp (image_module->module_name, "tga") == 0){
fill_vtable = mname (tga, fill_vtable);
}
#endif
if (fill_vtable) {
(* fill_vtable) (image_module);
return TRUE;
} else {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_UNKNOWN_TYPE,
_("Image type '%s' is not supported"),
image_module->module_name);
return FALSE;
}
}
#endif
GdkPixbufModule *
_gdk_pixbuf_get_named_module (const char *name,
GError **error)
{
int i;
for (i = 0; file_formats [i].module_name; i++) {
if (!strcmp(name, file_formats[i].module_name))
return &(file_formats[i]);
}
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_UNKNOWN_TYPE,
_("Image type '%s' is not supported"),
name);
return NULL;
}
GdkPixbufModule *
_gdk_pixbuf_get_module (guchar *buffer, guint size,
const gchar *filename,
GError **error)
{
int i;
for (i = 0; file_formats [i].module_name; i++) {
if ((* file_formats [i].format_check) (buffer, size))
return &(file_formats[i]);
}
if (filename)
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_UNKNOWN_TYPE,
_("Couldn't recognize the image file format for file '%s'"),
filename);
else
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_UNKNOWN_TYPE,
_("Unrecognized image file format"));
return NULL;
}
/**
* gdk_pixbuf_new_from_file:
* @filename: Name of file to load.
* @error: Return location for an error
*
* Creates a new pixbuf by loading an image from a file. The file format is
* detected automatically. If NULL is returned, then @error will be set.
* Possible errors are in the #GDK_PIXBUF_ERROR and #G_FILE_ERROR domains.
*
* Return value: A newly-created pixbuf with a reference count of 1, or NULL if
* any of several error conditions occurred: the file could not be opened,
* there was no loader for the file's format, there was not enough memory to
* allocate the image buffer, or the image file contained invalid data.
**/
GdkPixbuf *
gdk_pixbuf_new_from_file (const char *filename,
GError **error)
{
GdkPixbuf *pixbuf;
int size;
FILE *f;
guchar buffer [128];
GdkPixbufModule *image_module;
g_return_val_if_fail (filename != NULL, NULL);
f = fopen (filename, "rb");
if (!f) {
g_set_error (error,
G_FILE_ERROR,
g_file_error_from_errno (errno),
_("Failed to open file '%s': %s"),
filename, g_strerror (errno));
return NULL;
}
size = fread (&buffer, 1, sizeof (buffer), f);
if (size == 0) {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
_("Image file '%s' contains no data"),
filename);
fclose (f);
return NULL;
}
image_module = _gdk_pixbuf_get_module (buffer, size, filename, error);
if (image_module == NULL) {
fclose (f);
return NULL;
}
if (image_module->module == NULL)
if (!_gdk_pixbuf_load_module (image_module, error)) {
fclose (f);
return NULL;
}
if (image_module->load == NULL) {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_UNSUPPORTED_OPERATION,
_("Don't know how to load the image in file '%s'"),
filename);
fclose (f);
return NULL;
}
fseek (f, 0, SEEK_SET);
pixbuf = (* image_module->load) (f, error);
fclose (f);
if (pixbuf == NULL && error != NULL && *error == NULL) {
/* I don't trust these crufty longjmp()'ing image libs
* to maintain proper error invariants, and I don't
* want user code to segfault as a result. We need to maintain
* the invariant that error gets set if NULL is returned.
*/
g_warning ("Bug! gdk-pixbuf loader '%s' didn't set an error on failure.", image_module->module_name);
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_FAILED,
_("Failed to load image '%s': reason not known, probably a corrupt image file"),
filename);
} else if (error != NULL && *error != NULL) {
/* Add the filename to the error message */
GError *e = *error;
gchar *old;
old = e->message;
e->message = g_strdup_printf (_("Failed to load image '%s': %s"),
filename, old);
g_free (old);
}
return pixbuf;
}
/**
* gdk_pixbuf_new_from_xpm_data:
* @data: Pointer to inline XPM data.
*
* Creates a new pixbuf by parsing XPM data in memory. This data is commonly
* the result of including an XPM file into a program's C source.
*
* Return value: A newly-created pixbuf with a reference count of 1.
**/
GdkPixbuf *
gdk_pixbuf_new_from_xpm_data (const char **data)
{
GdkPixbuf *(* load_xpm_data) (const char **data);
GdkPixbuf *pixbuf;
GError *error = NULL;
if (file_formats[XPM_FILE_FORMAT_INDEX].module == NULL) {
if (!_gdk_pixbuf_load_module (&file_formats[XPM_FILE_FORMAT_INDEX], &error)) {
g_warning ("Error loading XPM image loader: %s", error->message);
g_error_free (error);
return FALSE;
}
}
if (file_formats[XPM_FILE_FORMAT_INDEX].module == NULL) {
g_warning ("Can't find gdk-pixbuf module for parsing inline XPM data");
return NULL;
} else if (file_formats[XPM_FILE_FORMAT_INDEX].load_xpm_data == NULL) {
g_warning ("gdk-pixbuf XPM module lacks XPM data capability");
return NULL;
} else
load_xpm_data = file_formats[XPM_FILE_FORMAT_INDEX].load_xpm_data;
pixbuf = (* load_xpm_data) (data);
return pixbuf;
}
static void
collect_save_options (va_list opts,
gchar ***keys,
gchar ***vals)
{
gchar *key;
gchar *val;
gchar *next;
gint count;
count = 0;
*keys = NULL;
*vals = NULL;
next = va_arg (opts, gchar*);
while (next)
{
key = next;
val = va_arg (opts, gchar*);
++count;
/* woo, slow */
*keys = g_realloc (*keys, sizeof(gchar*) * (count + 1));
*vals = g_realloc (*vals, sizeof(gchar*) * (count + 1));
(*keys)[count-1] = g_strdup (key);
(*vals)[count-1] = g_strdup (val);
(*keys)[count] = NULL;
(*vals)[count] = NULL;
next = va_arg (opts, gchar*);
}
}
static gboolean
gdk_pixbuf_real_save (GdkPixbuf *pixbuf,
FILE *filehandle,
const char *type,
gchar **keys,
gchar **values,
GError **error)
{
GdkPixbufModule *image_module = NULL;
image_module = _gdk_pixbuf_get_named_module (type, error);
if (image_module == NULL)
return FALSE;
if (image_module->module == NULL)
if (!_gdk_pixbuf_load_module (image_module, error))
return FALSE;
if (image_module->save == NULL) {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_UNSUPPORTED_OPERATION,
_("This build of gdk-pixbuf does not support saving the image format: %s"),
type);
return FALSE;
}
return (* image_module->save) (filehandle, pixbuf,
keys, values,
error);
}
/**
* gdk_pixbuf_save:
* @pixbuf: pointer to GdkPixbuf.
* @filename: Name of file to save.
* @type: name of file format.
* @error: return location for error, or NULL
* @Varargs: list of key-value save options
*
* Saves pixbuf to a file in @type, which is currently "jpeg" or
* "png". If @error is set, FALSE will be returned. Possible errors include
* those in the #GDK_PIXBUF_ERROR domain and those in the #G_FILE_ERROR domain.
*
* The variable argument list should be NULL-terminated; if not empty,
* it should contain pairs of strings that modify the save
* parameters. For example:
*
* <programlisting>
* gdk_pixbuf_save (pixbuf, handle, "jpeg", &error,
* "quality", "100", NULL);
* </programlisting>
*
* Currently only few parameters exist. JPEG images can be saved with a
* "quality" parameter; its value should be in the range [0,100].
* Text chunks can be attached to PNG images by specifying parameters of
* the form "tEXt::key", where key is an ASCII string of length 1-79.
* The values are UTF-8 encoded strings. Note however that PNG text
* chunks are stored in ISO-8859-1 encoding, so you can only set texts
* that can be represented in this encoding.
*
* Return value: whether an error was set
**/
gboolean
gdk_pixbuf_save (GdkPixbuf *pixbuf,
const char *filename,
const char *type,
GError **error,
...)
{
gchar **keys = NULL;
gchar **values = NULL;
va_list args;
gboolean result;
va_start (args, error);
collect_save_options (args, &keys, &values);
va_end (args);
result = gdk_pixbuf_savev (pixbuf, filename, type,
keys, values,
error);
g_strfreev (keys);
g_strfreev (values);
return result;
}
/**
* gdk_pixbuf_savev:
* @pixbuf: pointer to GdkPixbuf.
* @filename: Name of file to save.
* @type: name of file format.
* @option_keys: name of options to set, NULL-terminated
* @option_values: values for named options
* @error: return location for error, or NULL
*
* Saves pixbuf to a file in @type, which is currently "jpeg" or "png".
* If @error is set, FALSE will be returned. See gdk_pixbuf_save () for more
* details.
*
* Return value: whether an error was set
**/
gboolean
gdk_pixbuf_savev (GdkPixbuf *pixbuf,
const char *filename,
const char *type,
char **option_keys,
char **option_values,
GError **error)
{
FILE *f = NULL;
gboolean result;
g_return_val_if_fail (filename != NULL, FALSE);
g_return_val_if_fail (type != NULL, FALSE);
f = fopen (filename, "wb");
if (f == NULL) {
g_set_error (error,
G_FILE_ERROR,
g_file_error_from_errno (errno),
_("Failed to open '%s' for writing: %s"),
filename, g_strerror (errno));
return FALSE;
}
result = gdk_pixbuf_real_save (pixbuf, f, type,
option_keys, option_values,
error);
if (!result) {
g_return_val_if_fail (error == NULL || *error != NULL, FALSE);
fclose (f);
return FALSE;
}
if (fclose (f) < 0) {
g_set_error (error,
G_FILE_ERROR,
g_file_error_from_errno (errno),
_("Failed to close '%s' while writing image, all data may not have been saved: %s"),
filename, g_strerror (errno));
return FALSE;
}
return TRUE;
}
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