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| author | Christoph M. Becker <cmbecker69@gmx.de> | 2020-05-22 09:11:28 +0200 |
|---|---|---|
| committer | Christoph M. Becker <cmbecker69@gmx.de> | 2020-05-22 09:15:41 +0200 |
| commit | d4bd6fb491ccaf70006d6f671755126b47a71bcb (patch) | |
| tree | ddf3950ecdc0e71d4d9b0e4f2d892420ee7a6a31 /ext/gd/libgd/gd_gif_out.c | |
| parent | 85ac5643ff07e07e40df89510726e1bc66e6a50b (diff) | |
| download | php-git-d4bd6fb491ccaf70006d6f671755126b47a71bcb.tar.gz | |
Fix #79615: Wrong GIF header written in GD GIFEncode
The color resolution is expected in bits 4-6 of the packed fields byte
of the logical screen descriptor (byte 10 of the GIF data stream),
according to the specification[1], section 18.
[1] <https://www.w3.org/Graphics/GIF/spec-gif89a.txt>
Diffstat (limited to 'ext/gd/libgd/gd_gif_out.c')
| -rw-r--r-- | ext/gd/libgd/gd_gif_out.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/gd/libgd/gd_gif_out.c b/ext/gd/libgd/gd_gif_out.c index c0a0433f4d..771e8afe2e 100644 --- a/ext/gd/libgd/gd_gif_out.c +++ b/ext/gd/libgd/gd_gif_out.c @@ -319,7 +319,7 @@ GIFEncode(gdIOCtxPtr fp, int GWidth, int GHeight, int GInterlace, int Background /* * OR in the resolution */ - B |= (Resolution - 1) << 5; + B |= (Resolution - 1) << 4; /* * OR in the Bits per Pixel |