recreate project

2026-02-10 22:11:06 -05:00
commit 663c0cdbda
10149 changed files with 1379710 additions and 0 deletions
@@ -0,0 +1,70 @@
+<?php
+use Mike42\GfxPhp\Util\LzwCompression;
+use Mike42\GfxPhp\Util\LzwDecodeBuffer;
+
+use PHPUnit\Framework\TestCase;
+
+class LzwCompressionTest extends TestCase
+{
+    /*
+     * Known-good GIF-LZW strings from Wikipedia
+     * for 3x5 image like the one shown below.
+     *
+     * https://en.wikipedia.org/wiki/GIF
+     *╭──────╮
+     *│██░░░░│   ██ = 0x40
+     *│░░██░░│   ░░ = 0xFF
+     *│░░░░░░│
+     *│░░░░░░│
+     *│░░░░░░│
+     *╰──────╯
+     */
+    const compressedChars = [0x00, 0x51, 0xFC, 0x1B, 0x28, 0x70, 0xA0, 0xC1, 0x83, 0x01, 0x01];
+    const uncompressedChars = [0x28, 0xFF, 0xFF, 0xFF, 0x28, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF];
+
+    public function testLzwDecodeBufferBytes()
+    {
+        // Ensure we can extract numbers from input stream
+        $contents = "ABCD";
+        $buffer = new LzwDecodeBuffer($contents);
+        $this -> assertEquals(65,  $buffer -> read(8));
+        $this -> assertEquals(66,  $buffer -> read(8));
+        $this -> assertEquals(67,  $buffer -> read(8));
+        $this -> assertEquals(68,  $buffer -> read(8));
+        $this -> assertEquals(false,  $buffer -> read(8));
+    }
+    
+    public function testLzwDecodeBufferBits()
+    {
+        // Ensure we can extract numbers of strange lengths from input stream
+        $inp = pack("C*", ... LzwCompressionTest::compressedChars);
+        $buffer = new LzwDecodeBuffer($inp);
+        $this -> assertEquals(0x100,  $buffer -> read(9));
+        $this -> assertEquals(0x028,  $buffer -> read(9));
+        $this -> assertEquals(0x0FF,  $buffer -> read(9));
+        $this -> assertEquals(0x103,  $buffer -> read(9));
+        $this -> assertEquals(0x102,  $buffer -> read(9));
+        $this -> assertEquals(0x103,  $buffer -> read(9));
+        $this -> assertEquals(0x106,  $buffer -> read(9));
+        $this -> assertEquals(0x107,  $buffer -> read(9));
+        $this -> assertEquals(0x101,  $buffer -> read(9));
+        $this -> assertEquals(false,  $buffer -> read(9));
+    }
+    
+    public function testLzwDecompression()
+    {
+        // Test de-compression
+        $compressedStr = pack("C*", ... LzwCompressionTest::compressedChars);
+        $uncompressedStr = LzwCompression::decompress($compressedStr, 8);
+        $this -> assertEquals(LzwCompressionTest::uncompressedChars, array_values(unpack("C*", $uncompressedStr)));
+    }
+    
+    public function testLzwCompression()
+    {
+        // Test de-compression
+        $uncompressedStr = pack("C*", ... LzwCompressionTest::uncompressedChars);
+        $compressedStr = LzwCompression::compress($uncompressedStr, 8);
+        $this -> assertEquals(LzwCompressionTest::compressedChars, array_values(unpack("C*", $compressedStr)));
+    }
+
+}