From 09928120e31edbfa63791f0c2f5e14374ae518de Mon Sep 17 00:00:00 2001
From: Harry Jeffery <harry@exec64.co.uk>
Date: Sat, 2 Feb 2019 23:44:22 +0000
Subject: rsvg: Add open_memory support

---
 src/backend_librsvg.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 58 insertions(+), 4 deletions(-)

diff --git a/src/backend_librsvg.c b/src/backend_librsvg.c
index 2a08deb..083fb9c 100644
--- a/src/backend_librsvg.c
+++ b/src/backend_librsvg.c
@@ -14,11 +14,20 @@
 #define PATH_MAX 4096
 #endif
 
+struct private {
+  void *data;
+  size_t len;
+};
+
 static void source_free(struct imv_source *src)
 {
   free(src->name);
   src->name = NULL;
 
+  struct private *private = src->private;
+  free(private);
+  src->private = NULL;
+
   free(src);
 }
 
@@ -72,10 +81,18 @@ static void send_bitmap(struct imv_source *src, GdkPixbuf *bitmap)
 
 static void load_image(struct imv_source *src)
 {
+  RsvgHandle *handle = NULL;
   GError *error = NULL;
-  char path[PATH_MAX+8];
-  snprintf(path, sizeof path, "file://%s", src->name);
-  RsvgHandle *handle = rsvg_handle_new_from_file(path, &error);
+
+  struct private *private = src->private;
+  if (private->data) {
+    handle = rsvg_handle_new_from_data(private->data, private->len, &error);
+  } else {
+    char path[PATH_MAX+8];
+    snprintf(path, sizeof path, "file://%s", src->name);
+    handle = rsvg_handle_new_from_file(path, &error);
+  }
+
   if (!handle) {
     report_error(src);
     return;
@@ -113,6 +130,10 @@ static enum backend_result open_path(const char *path, struct imv_source **src)
     return BACKEND_UNSUPPORTED;
   }
 
+  struct private *private = malloc(sizeof(struct private));
+  private->data = NULL;
+  private->len = 0;
+
   struct imv_source *source = calloc(1, sizeof(struct imv_source));
   source->name = strdup(path);
 
@@ -125,7 +146,39 @@ static enum backend_result open_path(const char *path, struct imv_source **src)
   source->free = &source_free;
   source->callback = NULL;
   source->user_data = NULL;
-  source->private = NULL;
+  source->private = private;
+
+  *src = source;
+  return BACKEND_SUCCESS;
+}
+
+static enum backend_result open_memory(void *data, size_t len, struct imv_source **src)
+{
+  /* Look for an <SVG> tag near the start of the file */
+  char header[128];
+  memcpy(header, data, sizeof header);
+  header[(sizeof header) - 1] = 0;
+  if (!strstr(header, "<SVG") && !strstr(header, "<svg")) {
+    return BACKEND_UNSUPPORTED;
+  }
+
+  struct private *private = malloc(sizeof(struct private));
+  private->data = data;
+  private->len = len;
+
+  struct imv_source *source = calloc(1, sizeof(struct imv_source));
+  source->name = strdup("-");
+
+  source->width = 1024;
+  source->height = 1024;
+  source->num_frames = 1;
+  source->next_frame = 1;
+  source->load_first_frame = &load_image;
+  source->load_next_frame = NULL;
+  source->free = &source_free;
+  source->callback = NULL;
+  source->user_data = NULL;
+  source->private = private;
 
   *src = source;
   return BACKEND_SUCCESS;
@@ -137,6 +190,7 @@ const struct imv_backend librsvg_backend = {
   .website = "https://wiki.gnome.org/Projects/LibRsvg",
   .license = "Lesser GNU Public License",
   .open_path = &open_path,
+  .open_memory = &open_memory,
 };
 
 const struct imv_backend *imv_backend_librsvg(void)
-- 
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