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Fixed bug 2567 - x11: Local dropped files are not URI-decoded

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Melker Narikka

Local files that are dropped onto a window under X11
are not going through a URI decoding step, resulting in the following
in my test application:

Dropped file /home/meklu/Pictures/Screenshot%20from%202013-10-30%2014:04:50.png
Couldn't load /home/meklu/Pictures/Screenshot%20from%202013-10-30%2014:04:50.png

Expected result:

Dropped file /home/meklu/Pictures/Screenshot from 2013-10-30 14:04:50.png
Loaded /home/meklu/Pictures/Screenshot from 2013-10-30 14:04:50.png successfully

I've attached a patch that fixes the issue by doing URI decoding in-place on
the file string buffer.
This commit is contained in:
Sam Lantinga 2014-06-15 18:31:30 -07:00
parent af50403e50
commit 260549d1ca
1 changed files with 75 additions and 0 deletions
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75
src/video/x11/SDL_x11events.c
View File

@ -174,6 +174,79 @@ static SDL_bool X11_IsWheelEvent(Display * display,XEvent * event,int * ticks)
return SDL_FALSE;
}
/* Decodes URI escape sequences in string buf of len bytes
(excluding the terminating NULL byte) in-place. Since
URI-encoded characters take three times the space of
normal characters, this should not be an issue.
Returns the number of decoded bytes that wound up in
the buffer, excluding the terminating NULL byte.
The buffer is guaranteed to be NULL-terminated but
may contain embedded NULL bytes.
On error, -1 is returned.
*/
int X11_URIDecode(char *buf, int len) {
int ri, wi, di;
char decode = '\0';
if (buf == NULL || len < 0) {
errno = EINVAL;
return -1;
}
if (len == 0) {
len = SDL_strlen(buf);
}
for (ri = 0, wi = 0, di = 0; ri < len && wi < len; ri += 1) {
if (di == 0) {
/* start decoding */
if (buf[ri] == '%') {
decode = '\0';
di += 1;
continue;
}
/* normal write */
buf[wi] = buf[ri];
wi += 1;
continue;
} else if (di == 1 || di == 2) {
char off = '\0';
char isa = buf[ri] >= 'a' && buf[ri] <= 'f';
char isA = buf[ri] >= 'A' && buf[ri] <= 'F';
char isn = buf[ri] >= '0' && buf[ri] <= '9';
if (!(isa || isA || isn)) {
/* not a hexadecimal */
int sri;
for (sri = ri - di; sri <= ri; sri += 1) {
buf[wi] = buf[sri];
wi += 1;
}
di = 0;
continue;
}
/* itsy bitsy magicsy */
if (isn) {
off = 0 - '0';
} else if (isa) {
off = 10 - 'a';
} else if (isA) {
off = 10 - 'A';
}
decode |= (buf[ri] + off) << (2 - di) * 4;
if (di == 2) {
buf[wi] = decode;
wi += 1;
di = 0;
} else {
di += 1;
}
continue;
}
}
buf[wi] = '\0';
return wi;
}
/* Convert URI to local filename
return filename if possible, else NULL
*/
@ -202,6 +275,8 @@ static char* X11_URIToLocal(char* uri) {
}
if ( local ) {
file = uri;
/* Convert URI escape sequences to real characters */
X11_URIDecode(file, 0);
if ( uri[1] == '/' ) {
file++;
} else {