ecm 2026-07: Use LZSA1 or LZSA2 compression for crab-type flags

crabs/planize.py

@@ -55,8 +55,10 @@ def group_in_threes(seq):
 					cbuffer.append(chr(v))
 				outbuffers.append(cbuffer)
 			for i,buffer in enumerate(outbuffers):
+				with open('{}.bin'.format(variable_name.format(i)), 'wb') as of:
+					of.write(''.join(buffer))
 				proc=subprocess.Popen(
-					['lz4', '-c2s', 'stdin', TEMPFILE],
+					['lzsa', '-N', '-S', '-f', '2', '--prefer-ratio', '-v', '-', TEMPFILE],
 					stdin=subprocess.PIPE,
 					stdout=subprocess.PIPE,
 					stderr=subprocess.STDOUT
@@ -67,7 +69,7 @@ def group_in_threes(seq):
 					sys.exit()
 				with open(TEMPFILE,'rb') as f:
 					inbytes=f.read()
-				shutil.copyfile(TEMPFILE,'{}.lz4'.format(variable_name.format(i)))
+				shutil.copyfile(TEMPFILE,'{}.sa'.format(variable_name.format(i)))
 				lines=textwrap.wrap(', '.join(['0x{:02x}'.format(ord(x)) for x in inbytes]))
 
 				local_var = variable_name.format(i)

display.cpp

@@ -81,7 +81,7 @@ static int polygon_points[32];
 
 char far * volatile vga_ptr = (char far *)MK_FP(0xA000,0);
 
-extern "C" unsigned int far lz4_decompress(const void far *inbuffer, void* far outbuffer);
+extern "C" unsigned int far lzsa_depack(const void far *inbuffer, void* far outbuffer);
 
 #define PLANE_SIZE 38656 // 640*480/8 + 256
 
@@ -112,7 +112,7 @@ void DecompressStringIntoPlane(const unsigned char far *compressed_plane, int pl
 
 	SetVGAMapRegister(1 << plane);
 
-	lz4_decompress((const void far *)compressed_plane, plane_buffer);
+	lzsa_depack((const void far *)compressed_plane, plane_buffer);
 	memcpy(vga_ptr, plane_buffer, PLANE_SIZE);
 	farfree(plane_buffer);
 
@@ -210,4 +210,4 @@ void GraphicsCommand::render(){
 		}
 	}
 
-}
+}

vgapride.cpp

@@ -170,7 +170,7 @@ void quickFlags(){
 
 void displayUsage(){
 	printf("VGAPride %s by Foone Turing (@foone@digipres.club), 2022-2023. Other credits:\n", VERSION);
-	printf(" * lz4_8088 decompression code: Jim Leonard\n");
+	printf(" * lzsa decompression code: ecm 2026, Copyright (C) 2019 Emmanuel Marty\n");
 	printf(" * Aegosexual Flag: Keiya (@keiyakins)\n");
 	printf(" * Many flags: Rebecca G. Bettencourt (@RebeccaRGB)\n");
 	printf(" * Autistic Pride Flag licensed under a Creative Commons Attribution-ShareAlike 4.0 International License, from autisticempire.com/autistic-pride/\n");
@@ -180,4 +180,4 @@ void displayUsage(){
 	printf("\nQuick List:\n");
 	quickFlags();
 
-}
+}