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-rw-r--r--app/plug-in/gimpinterpreterdb.c874
1 files changed, 874 insertions, 0 deletions
diff --git a/app/plug-in/gimpinterpreterdb.c b/app/plug-in/gimpinterpreterdb.c
new file mode 100644
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--- /dev/null
+++ b/app/plug-in/gimpinterpreterdb.c
@@ -0,0 +1,874 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpinterpreterdb.c
+ * (C) 2005 Manish Singh <yosh@gimp.org>
+ *
+ * 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/>.
+ */
+
+/*
+ * The binfmt_misc bits are derived from linux/fs/binfmt_misc.c
+ * Copyright (C) 1997 Richard Günther
+ */
+
+/*
+ * The sh-bang code is derived from linux/fs/binfmt_script.c
+ * Copyright (C) 1996 Martin von Löwis
+ * original #!-checking implemented by tytso.
+ */
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include <gio/gio.h>
+
+#include "libgimpbase/gimpbase.h"
+
+#include "plug-in-types.h"
+
+#include "gimpinterpreterdb.h"
+
+#include "gimp-intl.h"
+
+
+#define BUFSIZE 4096
+
+
+typedef struct _GimpInterpreterMagic GimpInterpreterMagic;
+
+struct _GimpInterpreterMagic
+{
+ gulong offset;
+ gchar *magic;
+ gchar *mask;
+ guint size;
+ gchar *program;
+};
+
+
+static void gimp_interpreter_db_finalize (GObject *object);
+
+static void gimp_interpreter_db_load_interp_file (GimpInterpreterDB *db,
+ GFile *file);
+
+static void gimp_interpreter_db_add_program (GimpInterpreterDB *db,
+ GFile *file,
+ gchar *buffer);
+static void gimp_interpreter_db_add_binfmt_misc (GimpInterpreterDB *db,
+ GFile *file,
+ gchar *buffer);
+
+static gboolean gimp_interpreter_db_add_extension (GFile *file,
+ GimpInterpreterDB *db,
+ gchar **tokens);
+static gboolean gimp_interpreter_db_add_magic (GimpInterpreterDB *db,
+ gchar **tokens);
+
+static void gimp_interpreter_db_clear_magics (GimpInterpreterDB *db);
+
+static void gimp_interpreter_db_resolve_programs (GimpInterpreterDB *db);
+
+
+G_DEFINE_TYPE (GimpInterpreterDB, gimp_interpreter_db, G_TYPE_OBJECT)
+
+#define parent_class gimp_interpreter_db_parent_class
+
+
+static void
+gimp_interpreter_db_class_init (GimpInterpreterDBClass *class)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (class);
+
+ object_class->finalize = gimp_interpreter_db_finalize;
+}
+
+static void
+gimp_interpreter_db_init (GimpInterpreterDB *db)
+{
+}
+
+static void
+gimp_interpreter_db_finalize (GObject *object)
+{
+ GimpInterpreterDB *db = GIMP_INTERPRETER_DB (object);
+
+ gimp_interpreter_db_clear (db);
+
+ G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+GimpInterpreterDB *
+gimp_interpreter_db_new (gboolean verbose)
+{
+ GimpInterpreterDB *db = g_object_new (GIMP_TYPE_INTERPRETER_DB, NULL);
+
+ db->verbose = verbose;
+
+ return db;
+}
+
+void
+gimp_interpreter_db_load (GimpInterpreterDB *db,
+ GList *path)
+{
+ GList *list;
+
+ g_return_if_fail (GIMP_IS_INTERPRETER_DB (db));
+
+ gimp_interpreter_db_clear (db);
+
+ db->programs = g_hash_table_new_full (g_str_hash, g_str_equal,
+ g_free, g_free);
+
+ db->extensions = g_hash_table_new_full (g_str_hash, g_str_equal,
+ g_free, g_free);
+
+ db->magic_names = g_hash_table_new_full (g_str_hash, g_str_equal,
+ g_free, NULL);
+
+ db->extension_names = g_hash_table_new_full (g_str_hash, g_str_equal,
+ g_free, NULL);
+
+ for (list = path; list; list = g_list_next (list))
+ {
+ GFile *dir = list->data;
+ GFileEnumerator *enumerator;
+
+ enumerator =
+ g_file_enumerate_children (dir,
+ G_FILE_ATTRIBUTE_STANDARD_NAME ","
+ G_FILE_ATTRIBUTE_STANDARD_IS_HIDDEN ","
+ G_FILE_ATTRIBUTE_STANDARD_TYPE,
+ G_FILE_QUERY_INFO_NONE,
+ NULL, NULL);
+
+ if (enumerator)
+ {
+ GFileInfo *info;
+
+ while ((info = g_file_enumerator_next_file (enumerator,
+ NULL, NULL)))
+ {
+ if (! g_file_info_get_is_hidden (info) &&
+ g_file_info_get_file_type (info) == G_FILE_TYPE_REGULAR)
+ {
+ GFile *file = g_file_enumerator_get_child (enumerator, info);
+
+ gimp_interpreter_db_load_interp_file (db, file);
+
+ g_object_unref (file);
+ }
+
+ g_object_unref (info);
+ }
+
+ g_object_unref (enumerator);
+ }
+ }
+
+ gimp_interpreter_db_resolve_programs (db);
+}
+
+void
+gimp_interpreter_db_clear (GimpInterpreterDB *db)
+{
+ g_return_if_fail (GIMP_IS_INTERPRETER_DB (db));
+
+ if (db->magic_names)
+ {
+ g_hash_table_destroy (db->magic_names);
+ db->magic_names = NULL;
+ }
+
+ if (db->extension_names)
+ {
+ g_hash_table_destroy (db->extension_names);
+ db->extension_names = NULL;
+ }
+
+ if (db->programs)
+ {
+ g_hash_table_destroy (db->programs);
+ db->programs = NULL;
+ }
+
+ if (db->extensions)
+ {
+ g_hash_table_destroy (db->extensions);
+ db->extensions = NULL;
+ }
+
+ gimp_interpreter_db_clear_magics (db);
+}
+
+static void
+gimp_interpreter_db_load_interp_file (GimpInterpreterDB *db,
+ GFile *file)
+{
+ GInputStream *input;
+ GDataInputStream *data_input;
+ gchar *buffer;
+ gsize buffer_len;
+ GError *error = NULL;
+
+ if (db->verbose)
+ g_print ("Parsing '%s'\n", gimp_file_get_utf8_name (file));
+
+ input = G_INPUT_STREAM (g_file_read (file, NULL, &error));
+ if (! input)
+ {
+ g_message (_("Could not open '%s' for reading: %s"),
+ gimp_file_get_utf8_name (file),
+ error->message);
+ g_clear_error (&error);
+ return;
+ }
+
+ data_input = g_data_input_stream_new (input);
+ g_object_unref (input);
+
+ while ((buffer = g_data_input_stream_read_line (data_input, &buffer_len,
+ NULL, &error)))
+ {
+ /* Skip comments */
+ if (buffer[0] == '#')
+ {
+ g_free (buffer);
+ continue;
+ }
+
+ if (g_ascii_isalnum (buffer[0]) || (buffer[0] == '/'))
+ {
+ gimp_interpreter_db_add_program (db, file, buffer);
+ }
+ else if (! g_ascii_isspace (buffer[0]) && (buffer[0] != '\0'))
+ {
+ gimp_interpreter_db_add_binfmt_misc (db, file, buffer);
+ }
+
+ g_free (buffer);
+ }
+
+ if (error)
+ {
+ g_message (_("Error reading '%s': %s"),
+ gimp_file_get_utf8_name (file),
+ error->message);
+ g_clear_error (&error);
+ }
+
+ g_object_unref (data_input);
+}
+
+static void
+gimp_interpreter_db_add_program (GimpInterpreterDB *db,
+ GFile *file,
+ gchar *buffer)
+{
+ gchar *name;
+ gchar *program;
+ gchar *p;
+
+ p = strchr (buffer, '=');
+ if (! p)
+ return;
+
+ *p = '\0';
+
+ name = buffer;
+ program = p + 1;
+
+ if (! g_file_test (program, G_FILE_TEST_IS_EXECUTABLE))
+ {
+ gchar *prog;
+
+ prog = g_find_program_in_path (program);
+ if (! prog || ! g_file_test (prog, G_FILE_TEST_IS_EXECUTABLE))
+ {
+ g_message (_("Bad interpreter referenced in interpreter file %s: %s"),
+ gimp_file_get_utf8_name (file),
+ gimp_filename_to_utf8 (program));
+ if (prog)
+ g_free (prog);
+ return;
+ }
+ program = prog;
+ }
+ else
+ program = g_strdup (program);
+
+ if (! g_hash_table_lookup (db->programs, name))
+ g_hash_table_insert (db->programs, g_strdup (name), program);
+}
+
+static void
+gimp_interpreter_db_add_binfmt_misc (GimpInterpreterDB *db,
+ GFile *file,
+ gchar *buffer)
+{
+ gchar **tokens = NULL;
+ gchar *name, *type, *program;
+ gsize count;
+ gchar del[2];
+
+ count = strlen (buffer);
+
+ if ((count < 10) || (count > 255))
+ goto bail;
+
+ buffer = g_strndup (buffer, count + 9);
+
+ del[0] = *buffer;
+ del[1] = '\0';
+
+ memset (buffer + count, del[0], 8);
+
+ tokens = g_strsplit (buffer + 1, del, -1);
+
+ g_free (buffer);
+
+ name = tokens[0];
+ type = tokens[1];
+ program = tokens[5];
+
+ if ((name[0] == '\0') || (program[0] == '\0') ||
+ (type[0] == '\0') || (type[1] != '\0'))
+ goto bail;
+
+ switch (type[0])
+ {
+ case 'E':
+ if (! gimp_interpreter_db_add_extension (file, db, tokens))
+ goto bail;
+ break;
+
+ case 'M':
+ if (! gimp_interpreter_db_add_magic (db, tokens))
+ goto bail;
+ break;
+
+ default:
+ goto bail;
+ }
+
+ goto out;
+
+bail:
+ g_message (_("Bad binary format string in interpreter file %s"),
+ gimp_file_get_utf8_name (file));
+
+out:
+ g_strfreev (tokens);
+}
+
+static gboolean
+gimp_interpreter_db_add_extension (GFile *file,
+ GimpInterpreterDB *db,
+ gchar **tokens)
+{
+ const gchar *name = tokens[0];
+ const gchar *extension = tokens[3];
+ const gchar *program = tokens[5];
+
+ if (! g_hash_table_lookup (db->extension_names, name))
+ {
+ gchar *prog;
+
+ if (extension[0] == '\0' || extension[0] == '/')
+ return FALSE;
+
+ if (! g_file_test (program, G_FILE_TEST_IS_EXECUTABLE))
+ {
+ prog = g_find_program_in_path (program);
+ if (! prog || ! g_file_test (prog, G_FILE_TEST_IS_EXECUTABLE))
+ {
+ g_message (_("Bad interpreter referenced in interpreter file %s: %s"),
+ gimp_file_get_utf8_name (file),
+ gimp_filename_to_utf8 (program));
+ if (prog)
+ g_free (prog);
+ return FALSE;
+ }
+ }
+ else
+ prog = g_strdup (program);
+
+ g_hash_table_insert (db->extensions, g_strdup (extension), prog);
+ g_hash_table_insert (db->extension_names, g_strdup (name), prog);
+ }
+
+ return TRUE;
+}
+
+static gboolean
+scanarg (const gchar *s)
+{
+ gchar c;
+
+ while ((c = *s++) != '\0')
+ {
+ if (c == '\\' && *s == 'x')
+ {
+ s++;
+
+ if (! g_ascii_isxdigit (*s++))
+ return FALSE;
+
+ if (! g_ascii_isxdigit (*s++))
+ return FALSE;
+ }
+ }
+
+ return TRUE;
+}
+
+static guint
+unquote (gchar *from)
+{
+ gchar *s = from;
+ gchar *p = from;
+ gchar c;
+
+ while ((c = *s++) != '\0')
+ {
+ if (c == '\\' && *s == 'x')
+ {
+ s++;
+ *p = g_ascii_xdigit_value (*s++) << 4;
+ *p++ |= g_ascii_xdigit_value (*s++);
+ continue;
+ }
+
+ *p++ = c;
+ }
+
+ return p - from;
+}
+
+static gboolean
+gimp_interpreter_db_add_magic (GimpInterpreterDB *db,
+ gchar **tokens)
+{
+ GimpInterpreterMagic *interp_magic;
+ gchar *name, *num, *magic, *mask, *program;
+ gulong offset;
+ guint size;
+
+ name = tokens[0];
+ num = tokens[2];
+ magic = tokens[3];
+ mask = tokens[4];
+ program = tokens[5];
+
+ if (! g_hash_table_lookup (db->magic_names, name))
+ {
+ if (num[0] != '\0')
+ {
+ offset = strtoul (num, &num, 10);
+
+ if (num[0] != '\0')
+ return FALSE;
+
+ if (offset > (BUFSIZE / 4))
+ return FALSE;
+ }
+ else
+ {
+ offset = 0;
+ }
+
+ if (! scanarg (magic))
+ return FALSE;
+
+ if (! scanarg (mask))
+ return FALSE;
+
+ size = unquote (magic);
+
+ if ((size + offset) > (BUFSIZE / 2))
+ return FALSE;
+
+ if (mask[0] == '\0')
+ mask = NULL;
+ else if (unquote (mask) != size)
+ return FALSE;
+
+ interp_magic = g_slice_new (GimpInterpreterMagic);
+
+ interp_magic->offset = offset;
+ interp_magic->magic = g_memdup (magic, size);
+ interp_magic->mask = g_memdup (mask, size);
+ interp_magic->size = size;
+ interp_magic->program = g_strdup (program);
+
+ db->magics = g_slist_append (db->magics, interp_magic);
+
+ g_hash_table_insert (db->magic_names, g_strdup (name), interp_magic);
+ }
+
+ return TRUE;
+}
+
+static void
+gimp_interpreter_db_clear_magics (GimpInterpreterDB *db)
+{
+ GimpInterpreterMagic *magic;
+ GSList *list, *last;
+
+ list = db->magics;
+ db->magics = NULL;
+
+ while (list)
+ {
+ magic = list->data;
+
+ g_free (magic->magic);
+ g_free (magic->mask);
+ g_free (magic->program);
+
+ g_slice_free (GimpInterpreterMagic, magic);
+
+ last = list;
+ list = list->next;
+
+ g_slist_free_1 (last);
+ }
+}
+
+#ifdef INTERP_DEBUG
+static void
+print_kv (gpointer key,
+ gpointer value,
+ gpointer user_data)
+{
+ g_print ("%s: %s\n", (gchar *) key, (gchar *) value);
+}
+
+static gchar *
+quote (gchar *s,
+ guint size)
+{
+ GString *d;
+ guint i;
+
+ if (s == NULL)
+ return "(null)";
+
+ d = g_string_sized_new (size * 4);
+
+ for (i = 0; i < size; i++)
+ g_string_append_printf (d, "\\x%02x", ((guint) s[i]) & 0xff);
+
+ return g_string_free (d, FALSE);
+}
+#endif
+
+static gboolean
+resolve_program (gpointer key,
+ gpointer value,
+ gpointer user_data)
+{
+ GimpInterpreterDB *db = user_data;
+ gchar *program;
+
+ program = g_hash_table_lookup (db->programs, value);
+
+ if (program != NULL)
+ {
+ g_free (value);
+ value = g_strdup (program);
+ }
+
+ g_hash_table_insert (db->extensions, key, value);
+
+ return TRUE;
+}
+
+static void
+gimp_interpreter_db_resolve_programs (GimpInterpreterDB *db)
+{
+ GSList *list;
+ GHashTable *extensions;
+
+ for (list = db->magics; list; list = list->next)
+ {
+ GimpInterpreterMagic *magic = list->data;
+ const gchar *program;
+
+ program = g_hash_table_lookup (db->programs, magic->program);
+
+ if (program != NULL)
+ {
+ g_free (magic->program);
+ magic->program = g_strdup (program);
+ }
+ }
+
+ extensions = db->extensions;
+ db->extensions = g_hash_table_new_full (g_str_hash, g_str_equal,
+ g_free, g_free);
+
+ g_hash_table_foreach_steal (extensions, resolve_program, db);
+
+ g_hash_table_destroy (extensions);
+
+#ifdef INTERP_DEBUG
+ g_print ("Programs:\n");
+ g_hash_table_foreach (db->programs, print_kv, NULL);
+
+ g_print ("\nExtensions:\n");
+ g_hash_table_foreach (db->extensions, print_kv, NULL);
+
+ g_print ("\nMagics:\n");
+
+ list = db->magics;
+
+ while (list)
+ {
+ GimpInterpreterMagic *magic;
+
+ magic = list->data;
+ g_print ("program: %s, offset: %lu, magic: %s, mask: %s\n",
+ magic->program, magic->offset,
+ quote (magic->magic, magic->size),
+ quote (magic->mask, magic->size));
+
+ list = list->next;
+ }
+
+ g_print ("\n");
+#endif
+}
+
+static gchar *
+resolve_extension (GimpInterpreterDB *db,
+ const gchar *program_path)
+{
+ gchar *filename;
+ gchar *p;
+ const gchar *program;
+
+ filename = g_path_get_basename (program_path);
+
+ p = strrchr (filename, '.');
+ if (! p)
+ {
+ g_free (filename);
+ return NULL;
+ }
+
+ program = g_hash_table_lookup (db->extensions, p + 1);
+
+ g_free (filename);
+
+ return g_strdup (program);
+}
+
+static gchar *
+resolve_sh_bang (GimpInterpreterDB *db,
+ const gchar *program_path,
+ gchar *buffer,
+ gssize len,
+ gchar **interp_arg)
+{
+ gchar *cp;
+ gchar *name;
+ gchar *program;
+
+ cp = strchr (buffer, '\n');
+ if (! cp)
+ cp = buffer + len - 1;
+
+ *cp = '\0';
+
+ while (cp > buffer)
+ {
+ cp--;
+ if ((*cp == ' ') || (*cp == '\t') || (*cp == '\r'))
+ *cp = '\0';
+ else
+ break;
+ }
+
+ for (cp = buffer + 2; (*cp == ' ') || (*cp == '\t'); cp++);
+
+ if (*cp == '\0')
+ return NULL;
+
+ name = cp;
+
+ for ( ; *cp && (*cp != ' ') && (*cp != '\t'); cp++)
+ /* nothing */ ;
+
+ while ((*cp == ' ') || (*cp == '\t'))
+ *cp++ = '\0';
+
+ if (*cp)
+ {
+ if (strcmp ("/usr/bin/env", name) == 0)
+ {
+ program = g_hash_table_lookup (db->programs, cp);
+
+ if (program)
+ {
+ /* Shift program name and arguments to the right, if and
+ * only if we recorded a specific interpreter for such
+ * script. Otherwise let `env` tool do its job.
+ */
+ name = cp;
+
+ for ( ; *cp && (*cp != ' ') && (*cp != '\t'); cp++)
+ ;
+
+ while ((*cp == ' ') || (*cp == '\t'))
+ *cp++ = '\0';
+ }
+ }
+
+ if (*cp)
+ *interp_arg = g_strdup (cp);
+ }
+
+ program = g_hash_table_lookup (db->programs, name);
+ if (! program)
+ program = name;
+
+ return g_strdup (program);
+}
+
+static gchar *
+resolve_magic (GimpInterpreterDB *db,
+ const gchar *program_path,
+ gchar *buffer)
+{
+ GSList *list;
+ GimpInterpreterMagic *magic;
+ gchar *s;
+ guint i;
+
+ list = db->magics;
+
+ while (list)
+ {
+ magic = list->data;
+
+ s = buffer + magic->offset;
+
+ if (magic->mask)
+ {
+ for (i = 0; i < magic->size; i++)
+ if ((*s++ ^ magic->magic[i]) & magic->mask[i])
+ break;
+ }
+ else
+ {
+ for (i = 0; i < magic->size; i++)
+ if ((*s++ ^ magic->magic[i]))
+ break;
+ }
+
+ if (i == magic->size)
+ return g_strdup (magic->program);
+
+ list = list->next;
+ }
+
+ return NULL;
+}
+
+gchar *
+gimp_interpreter_db_resolve (GimpInterpreterDB *db,
+ const gchar *program_path,
+ gchar **interp_arg)
+{
+ GFile *file;
+ GInputStream *input;
+ gchar *program = NULL;
+
+ g_return_val_if_fail (GIMP_IS_INTERPRETER_DB (db), NULL);
+ g_return_val_if_fail (program_path != NULL, NULL);
+ g_return_val_if_fail (interp_arg != NULL, NULL);
+
+ *interp_arg = NULL;
+
+ file = g_file_new_for_path (program_path);
+ input = G_INPUT_STREAM (g_file_read (file, NULL, NULL));
+ g_object_unref (file);
+
+ if (input)
+ {
+ gsize bytes_read;
+ gchar buffer[BUFSIZE];
+
+ memset (buffer, 0, sizeof (buffer));
+ g_input_stream_read_all (input, buffer,
+ sizeof (buffer) - 1, /* leave one nul at the end */
+ &bytes_read, NULL, NULL);
+ g_object_unref (input);
+
+ if (bytes_read)
+ {
+ if (bytes_read > 3 && buffer[0] == '#' && buffer[1] == '!')
+ program = resolve_sh_bang (db, program_path, buffer, bytes_read, interp_arg);
+
+ if (! program)
+ program = resolve_magic (db, program_path, buffer);
+ }
+ }
+
+ if (! program)
+ program = resolve_extension (db, program_path);
+
+ return program;
+}
+
+static void
+collect_extensions (const gchar *ext,
+ const gchar *program G_GNUC_UNUSED,
+ GString *str)
+{
+ if (str->len)
+ g_string_append_c (str, G_SEARCHPATH_SEPARATOR);
+
+ g_string_append_c (str, '.');
+ g_string_append (str, ext);
+}
+
+/**
+ * gimp_interpreter_db_get_extensions:
+ * @db:
+ *
+ * Return value: a newly allocated string with all registered file
+ * extensions separated by %G_SEARCHPATH_SEPARATOR;
+ * or %NULL if no extensions are registered
+ **/
+gchar *
+gimp_interpreter_db_get_extensions (GimpInterpreterDB *db)
+{
+ GString *str;
+
+ g_return_val_if_fail (GIMP_IS_INTERPRETER_DB (db), NULL);
+
+ if (g_hash_table_size (db->extensions) == 0)
+ return NULL;
+
+ str = g_string_new (NULL);
+
+ g_hash_table_foreach (db->extensions, (GHFunc) collect_extensions, str);
+
+ return g_string_free (str, FALSE);
+}