[librsvg: 1/8] croco.rs: Minimal hand-written binding to the part of libcroco that we need

[Federico Mena Quintero <federico src gnome org>]

commit ff392a858218958ce5a5f3a84878a1eb014e6863
Author: Federico Mena Quintero <federico gnome org>
Date:   Tue Sep 25 08:35:03 2018 -0500

    croco.rs: Minimal hand-written binding to the part of libcroco that we need

 Makefile.am                 |   1 +
 rsvg_internals/src/croco.rs | 121 ++++++++++++++++++++++++++++++++++++++++++++
 rsvg_internals/src/lib.rs   |   1 +
 3 files changed, 123 insertions(+)
---
diff --git a/Makefile.am b/Makefile.am
index d8f7a80f..285a90d5 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -53,6 +53,7 @@ RUST_SRC =                                                    \
        rsvg_internals/src/color.rs                             \
        rsvg_internals/src/cond.rs                              \
        rsvg_internals/src/coord_units.rs                       \
+       rsvg_internals/src/croco.rs                             \
        rsvg_internals/src/css.rs                               \
        rsvg_internals/src/defs.rs                              \
        rsvg_internals/src/drawing_ctx.rs                       \
diff --git a/rsvg_internals/src/croco.rs b/rsvg_internals/src/croco.rs
new file mode 100644
index 00000000..4ee67e72
--- /dev/null
+++ b/rsvg_internals/src/croco.rs
@@ -0,0 +1,121 @@
+// This is a hand-written binding to a very minimal part of libcroco.  We don't use bindgen because
+// it wants to import pretty much all of glib's types and functions, and we just need a few.
+
+use glib_sys::{gboolean, gpointer, GList};
+use libc;
+
+// Opaque types from libcroco, or those which we only manipulate through libcroco functions
+pub type CRString = gpointer;
+pub type CRSimpleSel = gpointer;
+pub type CRParser = gpointer;
+pub type CRTerm = gpointer;
+
+pub type CRStatus = u32;
+
+pub type CREncoding = u32;
+pub const CREncoding_CR_UTF_8: CREncoding = 5;
+
+#[repr(C)]
+pub struct CRParsingLocation {
+    pub line: libc::c_uint,
+    pub column: libc::c_uint,
+    pub byte_offset: libc::c_uint,
+}
+
+#[repr(C)]
+pub struct CRSelector {
+    pub simple_sel: CRSimpleSel,
+
+    pub next: *mut CRSelector,
+    pub prev: *mut CRSelector,
+
+    pub location: CRParsingLocation,
+    pub ref_count: libc::c_long,
+}
+
+#[repr(C)]
+pub struct CRDocHandler {
+    pub priv_: gpointer,
+
+    pub app_data: gpointer,
+
+    pub start_document: gpointer,
+    pub end_document: gpointer,
+    pub charset: gpointer,
+
+    pub import_style: Option<
+        unsafe extern "C" fn(
+            a_this: *mut CRDocHandler,
+            a_media_list: *mut GList,
+            a_uri: CRString,
+            a_uri_default_ns: CRString,
+            a_location: CRParsingLocation,
+        ),
+    >,
+
+    pub import_style_result: gpointer,
+    pub namespace_declaration: gpointer,
+    pub comment: gpointer,
+
+    pub start_selector:
+        Option<unsafe extern "C" fn(a_this: *mut CRDocHandler, a_selector_list: *mut CRSelector)>,
+
+    pub end_selector:
+        Option<unsafe extern "C" fn(a_this: *mut CRDocHandler, a_selector_list: *mut CRSelector)>,
+
+    pub property: Option<
+        unsafe extern "C" fn(
+            a_this: *mut CRDocHandler,
+            a_name: CRString,
+            a_expression: CRTerm,
+            a_is_important: gboolean,
+        ),
+    >,
+
+    pub start_font_face: gpointer,
+    pub end_font_face: gpointer,
+    pub start_media: gpointer,
+    pub end_media: gpointer,
+    pub start_page: gpointer,
+    pub end_page: gpointer,
+    pub ignorable_at_rule: gpointer,
+
+    pub error: Option<unsafe extern "C" fn(a_this: *mut CRDocHandler)>,
+    pub unrecoverable_error: Option<unsafe extern "C" fn(a_this: *mut CRDocHandler)>,
+
+    pub resolve_import: gboolean,
+    pub ref_count: libc::c_ulong,
+}
+
+extern "C" {
+    pub fn cr_selector_ref(a_this: *mut CRSelector);
+    pub fn cr_selector_unref(a_this: *mut CRSelector) -> gboolean;
+
+    pub fn cr_simple_sel_to_string(a_this: CRSimpleSel) -> *mut libc::c_char;
+
+    pub fn cr_string_peek_raw_str(a_this: CRString) -> *const libc::c_char;
+    pub fn cr_string_peek_raw_str_len(a_this: CRString) -> libc::c_int;
+
+    pub fn cr_term_to_string(a_this: CRTerm) -> *mut libc::c_char;
+
+    pub fn cr_doc_handler_new() -> *mut CRDocHandler;
+    pub fn cr_doc_handler_unref(a_this: *mut CRDocHandler) -> gboolean;
+
+    pub fn cr_parser_new_from_buf(
+        a_buf: *mut libc::c_char,
+        a_len: libc::c_ulong,
+        a_enc: CREncoding,
+        a_free_buf: gboolean,
+    ) -> CRParser;
+
+    pub fn cr_parser_set_sac_handler(a_this: CRParser, a_handler: *mut CRDocHandler) -> CRStatus;
+
+    pub fn cr_parser_set_use_core_grammar(
+        a_this: CRParser,
+        a_use_core_grammar: gboolean,
+    ) -> CRStatus;
+
+    pub fn cr_parser_parse(a_this: CRParser) -> CRStatus;
+    pub fn cr_parser_destroy(a_this: CRParser);
+
+}
diff --git a/rsvg_internals/src/lib.rs b/rsvg_internals/src/lib.rs
index 08668927..cc5691e5 100644
--- a/rsvg_internals/src/lib.rs
+++ b/rsvg_internals/src/lib.rs
@@ -91,6 +91,7 @@ mod bbox;
 mod clip_path;
 mod color;
 mod cond;
+mod croco;
 mod css;
 mod defs;
 mod drawing_ctx;