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xdgmime: Add better detection for text vs. binary and zero-sized files

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This detects zero-sized files to return the special-case
"application/x-zerosize" mime-type, as well as trying to differentiate
unknown file types based on their first 128 bytes of data, so that text
editors can automatically handle unknown text files.

Based on:
https://cgit.freedesktop.org/xdg/xdgmime/commit/?id=5181175d5fdaa3832b0fd094cda0120b1fe92af6
https://cgit.freedesktop.org/xdg/xdgmime/commit/?id=9c5802b8da56187c5c6abaf70042d14b12d832a9

https://bugzilla.gnome.org/show_bug.cgi?id=795544
This commit is contained in:
David Faure
2018-05-02 15:46:25 +02:00
committed by Emmanuele Bassi
parent d0a48f26c7
commit 1c177ce0ab
5 changed files with 42 additions and 7 deletions
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6
gio/xdgmime/xdgmime.h
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@@ -66,6 +66,8 @@ typedef void (*XdgMimeDestroy) (void *user_data);
#define xdg_mime_register_reload_callback XDG_ENTRY(register_reload_callback)
#define xdg_mime_remove_callback XDG_ENTRY(remove_callback)
#define xdg_mime_type_unknown XDG_ENTRY(type_unknown)
#define xdg_mime_type_empty XDG_ENTRY(type_empty)
#define xdg_mime_type_textplain XDG_ENTRY(type_textplain)
#define xdg_mime_get_icon XDG_ENTRY(get_icon)
#define xdg_mime_get_generic_icon XDG_ENTRY(get_generic_icon)
@@ -75,7 +77,11 @@ typedef void (*XdgMimeDestroy) (void *user_data);
#endif
extern const char xdg_mime_type_unknown[];
extern const char xdg_mime_type_empty[];
extern const char xdg_mime_type_textplain[];
#define XDG_MIME_TYPE_UNKNOWN xdg_mime_type_unknown
#define XDG_MIME_TYPE_EMPTY xdg_mime_type_empty
#define XDG_MIME_TYPE_TEXTPLAIN xdg_mime_type_textplain
const char *xdg_mime_get_mime_type_for_data (const void *data,
size_t len,