[evince] comics: Fix decoding some files in RAR archives

[Bastien Nocera <hadess src gnome org>]

commit 499cd2025bc21ca725915f0e0b618bf8df2a0596
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Jul 12 12:53:19 2017 +0200

    comics: Fix decoding some files in RAR archives
    
    The unarr RAR decoder doesn't like it when we request more data than is
    available:
    ! rar.c:169: Requesting too much data (3563 < 10240)
    
    Clamp the size of the read request to the data left to read.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=784842

 backend/comics/comics-document.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)
---
diff --git a/backend/comics/comics-document.c b/backend/comics/comics-document.c
index ee06009..a913641 100644
--- a/backend/comics/comics-document.c
+++ b/backend/comics/comics-document.c
@@ -318,14 +318,19 @@ comics_document_get_page_size (EvDocument *document,
                if (g_strcmp0 (name, page_path) == 0) {
                        char buf[BLOCK_SIZE];
                        gssize read;
+                       gint64 left;
 
-                       read = ev_archive_read_data (comics_document->archive, buf, sizeof(buf), &error);
+                       left = ev_archive_get_entry_size (comics_document->archive);
+                       read = ev_archive_read_data (comics_document->archive, buf,
+                                                    MIN(BLOCK_SIZE, left), &error);
                        while (read > 0 && !info.got_info) {
                                if (!gdk_pixbuf_loader_write (loader, (guchar *) buf, read, &error)) {
                                        read = -1;
                                        break;
                                }
-                               read = ev_archive_read_data (comics_document->archive, buf, BLOCK_SIZE, 
&error);
+                               left -= read;
+                               read = ev_archive_read_data (comics_document->archive, buf,
+                                                            MIN(BLOCK_SIZE, left), &error);
                        }
                        if (read < 0) {
                                g_warning ("Fatal error reading '%s' in archive: %s", name, error->message);