gbagfx: Various fixes and improvements

Bring over Huffman compression/decompression from pokeemerald
Fix num_colors exceeding amount of colors in palette leading to use of uninitialized colors
Handle png -> pal conversion (aka extracting JASC palettes from png)
Allow JASC pal files to be used as -palette argument when converting from GBA to PNG
Allow using only file extension as output to reuse entire path from input before extension

1 files changed, 7 insertions, 0 deletions

diff --git a/tools/gbagfx/util.c b/tools/gbagfx/util.c
index 87abeb31c..735037692 100644
--- a/tools/gbagfx/util.c
+++ b/tools/gbagfx/util.c
@@ -47,6 +47,13 @@ char *GetFileExtension(char *path)
 	while (extension > path && *extension != '.')
 		extension--;
 
+	return extension;
+}
+
+char *GetFileExtensionAfterDot(char *path)
+{
+	char *extension = GetFileExtension(path);
+
 	if (extension == path)
 		return NULL;