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gitypelib.c
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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
* GObject introspection: typelib validation, auxiliary functions
* related to the binary typelib format
*
* Copyright (C) 2005 Matthias Clasen
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* 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 <stdlib.h>
#include <string.h>
#include <glib.h>
#include "gitypelib-internal.h"
#include "gitypelib.h"
/**
* GITypelib:
*
* `GITypelib` represents a loaded `.typelib` file, which contains a description
* of a single module’s API.
*
* Since: 2.80
*/
typedef struct {
GITypelib *typelib;
GSList *context_stack;
} ValidateContext;
#define ALIGN_VALUE(this, boundary) \
(( ((unsigned long)(this)) + (((unsigned long)(boundary)) -1)) & (~(((unsigned long)(boundary))-1)))
static void
push_context (ValidateContext *ctx, const char *name)
{
ctx->context_stack = g_slist_prepend (ctx->context_stack, (char*)name);
}
static void
pop_context (ValidateContext *ctx)
{
g_assert (ctx->context_stack != NULL);
ctx->context_stack = g_slist_delete_link (ctx->context_stack,
ctx->context_stack);
}
static gboolean
validate_interface_blob (ValidateContext *ctx,
guint32 offset,
GError **error);
static DirEntry *
get_dir_entry_checked (GITypelib *typelib,
guint16 index,
GError **error)
{
Header *header = (Header *)typelib->data;
guint32 offset;
if (index == 0 || index > header->n_entries)
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID_BLOB,
"Invalid directory index %d", index);
return FALSE;
}
offset = header->directory + (index - 1) * header->entry_blob_size;
if (typelib->len < offset + sizeof (DirEntry))
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID,
"The buffer is too short");
return FALSE;
}
return (DirEntry *)&typelib->data[offset];
}
static CommonBlob *
get_blob (GITypelib *typelib,
guint32 offset,
GError **error)
{
if (typelib->len < offset + sizeof (CommonBlob))
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID,
"The buffer is too short");
return FALSE;
}
return (CommonBlob *)&typelib->data[offset];
}
static InterfaceTypeBlob *
get_type_blob (GITypelib *typelib,
SimpleTypeBlob *simple,
GError **error)
{
if (simple->offset == 0)
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID,
"Expected blob for type");
return FALSE;
}
if (simple->flags.reserved == 0 && simple->flags.reserved2 == 0)
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID,
"Expected non-basic type but got %d",
simple->flags.tag);
return FALSE;
}
return (InterfaceTypeBlob*) get_blob (typelib, simple->offset, error);
}
/**
* gi_typelib_get_dir_entry:
* @typelib: a #GITypelib
* @index: index to retrieve
*
* Get the typelib directory entry at the given @index.
*
* Returns: (transfer none): a `DirEntry`
* Since: 2.80
*/
DirEntry *
gi_typelib_get_dir_entry (GITypelib *typelib,
guint16 index)
{
Header *header = (Header *)typelib->data;
return (DirEntry *)&typelib->data[header->directory + (index - 1) * header->entry_blob_size];
}
static Section *
get_section_by_id (GITypelib *typelib,
SectionType section_type)
{
Header *header = (Header *)typelib->data;
Section *section;
if (header->sections == 0)
return NULL;
for (section = (Section*)&typelib->data[header->sections];
section->id != GI_SECTION_END;
section++)
{
if (section->id == section_type)
return section;
}
return NULL;
}
/**
* gi_typelib_get_dir_entry_by_name:
* @typelib: a #GITypelib
* @name: name to look up
*
* Get the typelib directory entry which has @name.
*
* Returns: (transfer none) (nullable): entry corresponding to @name, or `NULL`
* if none was found
* Since: 2.80
*/
DirEntry *
gi_typelib_get_dir_entry_by_name (GITypelib *typelib,
const char *name)
{
Section *dirindex;
gint i, n_entries;
const char *entry_name;
DirEntry *entry;
dirindex = get_section_by_id (typelib, GI_SECTION_DIRECTORY_INDEX);
n_entries = ((Header *)typelib->data)->n_local_entries;
if (dirindex == NULL)
{
for (i = 1; i <= n_entries; i++)
{
entry = gi_typelib_get_dir_entry (typelib, i);
entry_name = gi_typelib_get_string (typelib, entry->name);
if (strcmp (name, entry_name) == 0)
return entry;
}
return NULL;
}
else
{
guint8 *hash = (guint8*) &typelib->data[dirindex->offset];
guint16 index;
index = gi_typelib_hash_search (hash, name, n_entries);
entry = gi_typelib_get_dir_entry (typelib, index + 1);
entry_name = gi_typelib_get_string (typelib, entry->name);
if (strcmp (name, entry_name) == 0)
return entry;
return NULL;
}
}
/**
* gi_typelib_get_dir_entry_by_gtype_name:
* @typelib: a #GITypelib
* @gtype_name: name of a [[email protected]] to look up
*
* Get the typelib directory entry for the [[email protected]] with the given
* @gtype_name.
*
* Returns: (transfer none) (nullable): entry corresponding to @gtype_name, or
* `NULL` if none was found
* Since: 2.80
*/
DirEntry *
gi_typelib_get_dir_entry_by_gtype_name (GITypelib *typelib,
const gchar *gtype_name)
{
Header *header = (Header *)typelib->data;
guint i;
for (i = 1; i <= header->n_local_entries; i++)
{
RegisteredTypeBlob *blob;
const char *type;
DirEntry *entry = gi_typelib_get_dir_entry (typelib, i);
if (!BLOB_IS_REGISTERED_TYPE (entry))
continue;
blob = (RegisteredTypeBlob *)(&typelib->data[entry->offset]);
if (!blob->gtype_name)
continue;
type = gi_typelib_get_string (typelib, blob->gtype_name);
if (strcmp (type, gtype_name) == 0)
return entry;
}
return NULL;
}
typedef struct {
const char *s;
const char *separator;
gsize sep_len;
GString buf;
} StrSplitIter;
static void
strsplit_iter_init (StrSplitIter *iter,
const char *s,
const char *separator)
{
iter->s = s;
iter->separator = separator;
iter->sep_len = strlen (separator);
iter->buf.str = NULL;
iter->buf.len = 0;
iter->buf.allocated_len = 0;
}
static gboolean
strsplit_iter_next (StrSplitIter *iter,
const char **out_val)
{
const char *s = iter->s;
const char *next;
gsize len;
if (!s)
return FALSE;
next = strstr (s, iter->separator);
if (next)
{
iter->s = next + iter->sep_len;
len = next - s;
}
else
{
iter->s = NULL;
len = strlen (s);
}
if (len == 0)
{
*out_val = "";
}
else
{
g_string_overwrite_len (&iter->buf, 0, s, (gssize)len);
*out_val = iter->buf.str;
}
return TRUE;
}
static void
strsplit_iter_clear (StrSplitIter *iter)
{
g_free (iter->buf.str);
}
/**
* gi_typelib_matches_gtype_name_prefix:
* @typelib: a #GITypelib
* @gtype_name: name of a [[email protected]]
*
* Check whether the symbol prefix for @typelib is a prefix of the given
* @gtype_name.
*
* Returns: `TRUE` if the prefix for @typelib prefixes @gtype_name
* Since: 2.80
*/
gboolean
gi_typelib_matches_gtype_name_prefix (GITypelib *typelib,
const gchar *gtype_name)
{
Header *header = (Header *)typelib->data;
const char *c_prefix;
const gchar *prefix;
gboolean ret = FALSE;
StrSplitIter split_iter;
gsize gtype_name_len;
c_prefix = gi_typelib_get_string (typelib, header->c_prefix);
if (c_prefix == NULL || strlen (c_prefix) == 0)
return FALSE;
gtype_name_len = strlen (gtype_name);
/* c_prefix is a comma separated string of supported prefixes
* in the typelib.
* We match the specified gtype_name if the gtype_name starts
* with the prefix, and is followed by a capital letter.
* For example, a typelib offering the 'Gdk' prefix does match
* GdkX11Cursor, however a typelib offering the 'G' prefix does not.
*/
strsplit_iter_init (&split_iter, c_prefix, ",");
while (strsplit_iter_next (&split_iter, &prefix))
{
size_t len = strlen (prefix);
if (gtype_name_len < len)
continue;
if (strncmp (prefix, gtype_name, len) != 0)
continue;
if (g_ascii_isupper (gtype_name[len]))
{
ret = TRUE;
break;
}
}
strsplit_iter_clear (&split_iter);
return ret;
}
/**
* gi_typelib_get_dir_entry_by_error_domain:
* @typelib: a #GITypelib
* @error_domain: name of a [[email protected]] domain to look up
*
* Get the typelib directory entry for the [[email protected]] domain with the
* given @error_domain name.
*
* Returns: (transfer none) (nullable): entry corresponding to @error_domain, or
* `NULL` if none was found
* Since: 2.80
*/
DirEntry *
gi_typelib_get_dir_entry_by_error_domain (GITypelib *typelib,
GQuark error_domain)
{
Header *header = (Header *)typelib->data;
guint n_entries = header->n_local_entries;
const char *domain_string = g_quark_to_string (error_domain);
DirEntry *entry;
guint i;
for (i = 1; i <= n_entries; i++)
{
EnumBlob *blob;
const char *enum_domain_string;
entry = gi_typelib_get_dir_entry (typelib, i);
if (entry->blob_type != BLOB_TYPE_ENUM)
continue;
blob = (EnumBlob *)(&typelib->data[entry->offset]);
if (!blob->error_domain)
continue;
enum_domain_string = gi_typelib_get_string (typelib, blob->error_domain);
if (strcmp (domain_string, enum_domain_string) == 0)
return entry;
}
return NULL;
}
/**
* gi_typelib_check_sanity:
*
* Check compile-time sizes of various typelib file format types are as
* expected.
*
* Since: 2.80
*/
void
gi_typelib_check_sanity (void)
{
#ifndef G_DISABLE_ASSERT
/* Check that struct layout is as we expect */
gboolean size_check_ok = TRUE;
#define CHECK_SIZE(s,n) \
if (sizeof(s) != n) \
{ \
g_printerr ("sizeof("#s") is expected to be %d but is %"G_GSIZE_FORMAT".\n", \
n, sizeof (s)); \
size_check_ok = FALSE; \
}
/* When changing the size of a typelib structure, you are required to update
* the hardcoded size here. Do NOT change these to use sizeof(); these
* should match whatever is defined in the text specification and serve as
* a sanity check on structure modifications.
*
* Everything else in the code however should be using sizeof().
*/
CHECK_SIZE (Header, 112);
CHECK_SIZE (DirEntry, 12);
CHECK_SIZE (SimpleTypeBlob, 4);
CHECK_SIZE (ArgBlob, 16);
CHECK_SIZE (SignatureBlob, 8);
CHECK_SIZE (CommonBlob, 8);
CHECK_SIZE (FunctionBlob, 20);
CHECK_SIZE (CallbackBlob, 12);
CHECK_SIZE (InterfaceTypeBlob, 4);
CHECK_SIZE (ArrayTypeBlob, 8);
CHECK_SIZE (ParamTypeBlob, 4);
CHECK_SIZE (ErrorTypeBlob, 4);
CHECK_SIZE (ValueBlob, 12);
CHECK_SIZE (FieldBlob, 16);
CHECK_SIZE (RegisteredTypeBlob, 16);
CHECK_SIZE (StructBlob, 32);
CHECK_SIZE (EnumBlob, 24);
CHECK_SIZE (PropertyBlob, 16);
CHECK_SIZE (SignalBlob, 16);
CHECK_SIZE (VFuncBlob, 20);
CHECK_SIZE (ObjectBlob, 60);
CHECK_SIZE (InterfaceBlob, 40);
CHECK_SIZE (ConstantBlob, 24);
CHECK_SIZE (AttributeBlob, 12);
CHECK_SIZE (UnionBlob, 40);
#undef CHECK_SIZE
g_assert (size_check_ok);
#endif /* !G_DISABLE_ASSERT */
}
static gboolean
is_aligned (guint32 offset)
{
return offset == ALIGN_VALUE (offset, 4);
}
#define MAX_NAME_LEN 2048
static const char *
get_string (GITypelib *typelib, guint32 offset, GError **error)
{
if (typelib->len < offset)
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID,
"Buffer is too short while looking up name");
return NULL;
}
return (const char*)&typelib->data[offset];
}
static const char *
get_string_nofail (GITypelib *typelib, guint32 offset)
{
const char *ret = get_string (typelib, offset, NULL);
g_assert (ret);
return ret;
}
static gboolean
validate_name (GITypelib *typelib,
const char *msg,
const guchar *data, guint32 offset,
GError **error)
{
const char *name;
name = get_string (typelib, offset, error);
if (!name)
return FALSE;
if (!memchr (name, '\0', MAX_NAME_LEN))
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID,
"The %s is too long: %s",
msg, name);
return FALSE;
}
if (strspn (name, G_CSET_a_2_z G_CSET_A_2_Z G_CSET_DIGITS "-_") < strlen (name))
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID,
"The %s contains invalid characters: '%s'",
msg, name);
return FALSE;
}
return TRUE;
}
/* Fast path sanity check, operates on a memory blob */
static gboolean
validate_header_basic (const guint8 *memory,
gsize len,
GError **error)
{
Header *header = (Header *)memory;
if (len < sizeof (Header))
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID,
"The specified typelib length %" G_GSIZE_FORMAT " is too short",
len);
return FALSE;
}
if (strncmp (header->magic, GI_IR_MAGIC, 16) != 0)
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID_HEADER,
"Invalid magic header");
return FALSE;
}
if (header->major_version != 4)
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID_HEADER,
"Typelib version mismatch; expected 4, found %d",
header->major_version);
return FALSE;
}
if (header->n_entries < header->n_local_entries)
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID_HEADER,
"Inconsistent entry counts");
return FALSE;
}
if (header->size != len)
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID_HEADER,
"Typelib size %" G_GSIZE_FORMAT " does not match %" G_GSIZE_FORMAT,
(gsize) header->size, len);
return FALSE;
}
/* This is a sanity check for a specific typelib; it
* prevents us from loading an incompatible typelib.
*
* The hardcoded checks in gi_typelib_check_sanity to
* protect against inadvertent or buggy changes to the typelib format
* itself.
*/
if (header->entry_blob_size != sizeof (DirEntry) ||
header->function_blob_size != sizeof (FunctionBlob) ||
header->callback_blob_size != sizeof (CallbackBlob) ||
header->signal_blob_size != sizeof (SignalBlob) ||
header->vfunc_blob_size != sizeof (VFuncBlob) ||
header->arg_blob_size != sizeof (ArgBlob) ||
header->property_blob_size != sizeof (PropertyBlob) ||
header->field_blob_size != sizeof (FieldBlob) ||
header->value_blob_size != sizeof (ValueBlob) ||
header->constant_blob_size != sizeof (ConstantBlob) ||
header->attribute_blob_size != sizeof (AttributeBlob) ||
header->signature_blob_size != sizeof (SignatureBlob) ||
header->enum_blob_size != sizeof (EnumBlob) ||
header->struct_blob_size != sizeof (StructBlob) ||
header->object_blob_size != sizeof(ObjectBlob) ||
header->interface_blob_size != sizeof (InterfaceBlob) ||
header->union_blob_size != sizeof (UnionBlob))
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID_HEADER,
"Blob size mismatch");
return FALSE;
}
if (!is_aligned (header->directory))
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID_HEADER,
"Misaligned directory");
return FALSE;
}
if (!is_aligned (header->attributes))
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID_HEADER,
"Misaligned attributes");
return FALSE;
}
if (header->attributes == 0 && header->n_attributes > 0)
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID_HEADER,
"Wrong number of attributes");
return FALSE;
}
return TRUE;
}
static gboolean
validate_header (ValidateContext *ctx,
GError **error)
{
GITypelib *typelib = ctx->typelib;
if (!validate_header_basic (typelib->data, typelib->len, error))
return FALSE;
{
Header *header = (Header*)typelib->data;
if (!validate_name (typelib, "namespace", typelib->data, header->namespace, error))
return FALSE;
}
return TRUE;
}
static gboolean validate_type_blob (GITypelib *typelib,
guint32 offset,
guint32 signature_offset,
gboolean return_type,
GError **error);
static gboolean
validate_array_type_blob (GITypelib *typelib,
guint32 offset,
guint32 signature_offset,
gboolean return_type,
GError **error)
{
/* FIXME validate length */
if (!validate_type_blob (typelib,
offset + G_STRUCT_OFFSET (ArrayTypeBlob, type),
0, FALSE, error))
return FALSE;
return TRUE;
}
static gboolean
validate_iface_type_blob (GITypelib *typelib,
guint32 offset,
guint32 signature_offset,
gboolean return_type,
GError **error)
{
InterfaceTypeBlob *blob;
InterfaceBlob *target;
blob = (InterfaceTypeBlob*)&typelib->data[offset];
target = (InterfaceBlob*) get_dir_entry_checked (typelib, blob->interface, error);
if (!target)
return FALSE;
if (target->blob_type == 0) /* non-local */
return TRUE;
return TRUE;
}
static gboolean
validate_param_type_blob (GITypelib *typelib,
guint32 offset,
guint32 signature_offset,
gboolean return_type,
gint n_params,
GError **error)
{
ParamTypeBlob *blob;
gint i;
blob = (ParamTypeBlob*)&typelib->data[offset];
if (!blob->pointer)
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID_BLOB,
"Pointer type exected for tag %d", blob->tag);
return FALSE;
}
if (blob->n_types != n_params)
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID_BLOB,
"Parameter type number mismatch");
return FALSE;
}
for (i = 0; i < n_params; i++)
{
if (!validate_type_blob (typelib,
offset + sizeof (ParamTypeBlob) +
i * sizeof (SimpleTypeBlob),
0, FALSE, error))
return FALSE;
}
return TRUE;
}
static gboolean
validate_error_type_blob (GITypelib *typelib,
guint32 offset,
guint32 signature_offset,
gboolean return_type,
GError **error)
{
ErrorTypeBlob *blob;
blob = (ErrorTypeBlob*)&typelib->data[offset];
if (!blob->pointer)
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID_BLOB,
"Pointer type exected for tag %d", blob->tag);
return FALSE;
}
return TRUE;
}
static gboolean
validate_type_blob (GITypelib *typelib,
guint32 offset,
guint32 signature_offset,
gboolean return_type,
GError **error)
{
SimpleTypeBlob *simple;
InterfaceTypeBlob *iface;
simple = (SimpleTypeBlob *)&typelib->data[offset];
if (simple->flags.reserved == 0 &&
simple->flags.reserved2 == 0)
{
if (!GI_TYPE_TAG_IS_BASIC(simple->flags.tag))
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID_BLOB,
"Invalid non-basic tag %d in simple type", simple->flags.tag);
return FALSE;
}
if (simple->flags.tag >= GI_TYPE_TAG_UTF8 &&
simple->flags.tag != GI_TYPE_TAG_UNICHAR &&
!simple->flags.pointer)
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID_BLOB,
"Pointer type exected for tag %d", simple->flags.tag);
return FALSE;
}
return TRUE;
}
iface = (InterfaceTypeBlob*)&typelib->data[simple->offset];
switch (iface->tag)
{
case GI_TYPE_TAG_ARRAY:
if (!validate_array_type_blob (typelib, simple->offset,
signature_offset, return_type, error))
return FALSE;
break;
case GI_TYPE_TAG_INTERFACE:
if (!validate_iface_type_blob (typelib, simple->offset,
signature_offset, return_type, error))
return FALSE;
break;
case GI_TYPE_TAG_GLIST:
case GI_TYPE_TAG_GSLIST:
if (!validate_param_type_blob (typelib, simple->offset,
signature_offset, return_type, 1, error))
return FALSE;
break;
case GI_TYPE_TAG_GHASH:
if (!validate_param_type_blob (typelib, simple->offset,
signature_offset, return_type, 2, error))
return FALSE;
break;
case GI_TYPE_TAG_ERROR:
if (!validate_error_type_blob (typelib, simple->offset,
signature_offset, return_type, error))
return FALSE;
break;
default:
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID_BLOB,
"Wrong tag in complex type");
return FALSE;
}
return TRUE;
}
static gboolean
validate_arg_blob (GITypelib *typelib,
guint32 offset,
guint32 signature_offset,
GError **error)
{
ArgBlob *blob;
if (typelib->len < offset + sizeof (ArgBlob))
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID,
"The buffer is too short");
return FALSE;
}
blob = (ArgBlob*) &typelib->data[offset];
if (!validate_name (typelib, "argument", typelib->data, blob->name, error))
return FALSE;
if (!validate_type_blob (typelib,
offset + G_STRUCT_OFFSET (ArgBlob, arg_type),
signature_offset, FALSE, error))
return FALSE;
return TRUE;
}
static SimpleTypeBlob *
return_type_from_signature (GITypelib *typelib,
guint32 offset,
GError **error)
{
SignatureBlob *blob;
if (typelib->len < offset + sizeof (SignatureBlob))
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID,
"The buffer is too short");
return NULL;
}
blob = (SignatureBlob*) &typelib->data[offset];
if (blob->return_type.offset == 0)
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID,
"No return type found in signature");
return NULL;
}
return (SimpleTypeBlob *)&typelib->data[offset + G_STRUCT_OFFSET (SignatureBlob, return_type)];
}
static gboolean
validate_signature_blob (GITypelib *typelib,
guint32 offset,
GError **error)
{
SignatureBlob *blob;
gint i;
if (typelib->len < offset + sizeof (SignatureBlob))
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID,
"The buffer is too short");
return FALSE;
}
blob = (SignatureBlob*) &typelib->data[offset];
if (blob->return_type.offset != 0)
{
if (!validate_type_blob (typelib,
offset + G_STRUCT_OFFSET (SignatureBlob, return_type),
offset, TRUE, error))
return FALSE;
}
for (i = 0; i < blob->n_arguments; i++)
{
if (!validate_arg_blob (typelib,
offset + sizeof (SignatureBlob) +
i * sizeof (ArgBlob),
offset,
error))
return FALSE;
}
/* FIXME check constraints on return_value */
/* FIXME check array-length pairs */
return TRUE;
}
static gboolean
validate_function_blob (ValidateContext *ctx,
guint32 offset,
guint16 container_type,
GError **error)
{
GITypelib *typelib = ctx->typelib;
FunctionBlob *blob;
if (typelib->len < offset + sizeof (FunctionBlob))
{
g_set_error (error,
GI_TYPELIB_ERROR,
GI_TYPELIB_ERROR_INVALID,