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  3. /*

  4. * ??: ??? ??? ???? ??? ??? ????? ?????.
  5. */

  6. $ViewRandomCode = mt_rand(1000,10000);

  7. session_start();

  8. $_SESSION[' checksum'] = $ViewRandomCode;

  9. function set_4pixel($r, $g, $b, $x, $y)

  10. {
  11. global $sx, $sy , $pixels;

  12. $ofs = 3 * ($sx * $y $x);

  13. $pixels[$ofs] = chr($r);
  14. $pixels[$ofs 1] = chr($g);
  15. $pixels[$ofs 2] = chr($b);
  16. $pixels[$ofs 3] = chr($r);
  17. $pixels[$ofs 4] = chr($g);
  18. $pixels[$ofs 5] = chr($b);
  19. $ofs = 3 * $sx;
  20. $pixels[$ ofs] = chr($r);
  21. $pixels[$ofs 1] = chr($g);
  22. $pixels[$ofs 2] = chr($b);
  23. $pixels[$ ofs 3] = chr($r);
  24. $pixels[$ofs 4] = chr($g);
  25. $pixels[$ofs 5] = chr($b);
  26. }
  27. //生成數(shù)字圖象的函數(shù)
  28. function draw2digits($x, $y, $number)
  29. {
  30. draw_digit($x, $y, (int) ($number / 10));
  31. draw_digit($x 11, $y, $number % 10);
  32. }

  33. function draw_digit($x, $y, $digit)

  34. {
  35. ??? $sx, $sy, $pixels, $digits, $lines;

  36. $digit = $digits[$digit];

  37. $m = 8;
  38. for ($b = 1, $i = 0; $i < 7; $i , $b *= 2)
  39. {
  40. if (($b & $digit) == $b) {
  41. $j = $i * 4;
  42. $x0 = $lines [$j] * $m $x;
  43. $y0 = $lines[$j 1] * $m $y;
  44. $x1 = $lines[$j 2] * $m $x;
  45. $y1 = $lines[$j 3] * $m $y;
  46. if ($x0 == $x1) {
  47. $ofs = 3 * ($sx * $y0 $x0);
  48. for ($h = $y0; $h $pixels[$ofs] = chr(0);
  49. $pixels[ $ofs 1] = chr(0);
  50. $pixels[$ofs 2] = chr(0);
  51. }
  52. } else {
  53. $ofs = 3 * ($sx * $y0 $x0);
  54. for ($w = $x0; $w <= $x1; $w ) {
  55. $pixels[$ofs ] = chr(0);
  56. $pixels[$ofs ] = chr(0);
  57. $pixels[$ofs ] = chr(0);
  58. }
  59. }
  60. }
  61. }
  62. }

  63. //將文字加入到圖象中

  64. ?? add_chunk($type)
  65. {
  66. global $result, $data, $chunk, $crc_table;

  67. // ?? :為層

  68. // ??: 4 字節(jié): 用來計算 ??
  69. // ?? ??: 4 字節(jié)
  70. // ?? ???: ?? ???
  71. / / CRC: 4 字節(jié): 循環(huán)冗余碼校驗

  72. // ??? ?? ? CRC ??? ??

  73. $len = strlen($data);
  74. $chunk = pack(“c*”, ($len >> 24) & 255,
  75. ($len >> 16) & 255,
  76. ($len >> 8) & 255,
  77. $len & 255);
  78. $chunk .= $type;
  79. $chunk .= $data;

  80. // ?? ??? ??[4..len-1]

  81. $z = 16777215;
  82. $z |= 255 << 24;
  83. $c = $z;
  84. for ($n = 4; $n < strlen($chunk); $n ) {
  85. $c8 = ($c >> 8) & 0xffffff;
  86. $c = $crc_table[($c ^ ord($chunk[$n])) & 0xff] ^ $c8;
  87. }
  88. $crc = $c ^ $z;< ;/p>

  89. $chunk .= chr(($crc >> 24) & 255);

  90. $chunk .= chr(($crc >> 16) & 255 );
  91. $chunk .= chr(($crc >> 8) & 255);
  92. $chunk .= chr($crc & 255);

  94. $result .= $chunk;
  95. }

  96. //主程序

  97. < p>$sx = 55;
  98. $sy = 21;
  99. $pixels = rand(100,99990)%2?”qwer”:”";

  100. / / 填充

  101. for ($h = 0; $h {
  102. for ($w = 0; $w {
  103. $r = 100 / $sx * $w 155;
  104. $g = 100 / $sy * $h 155;
  105. $b = 255 – (100 / ($sx $sy) * ($ w $h));
  106. $pixels .= chr($r);
  107. $pixels .= chr($g);
  108. $pixels .= chr($b);
  109. }
  110. }

  111. $checknum = isset($ViewRandomCode)?$ViewRandomCode:1234;

  112. $h = (int)($checknum/100);
  113. $m = (int)($checknum 0);
  114. $digits = ??(95, 5, 118, 117, 45, 121, 123, 69, 127, 125);
  115. $lines = ??(1, 1, 1, 2, 0, 1, 0, 2, 1, 0, 1, 1, 0, 0, 0, 1, 0, 2, 1, 2, 0, 1, 1, 1, 0, 0, 1, 0);

  116. draw2digits(4, 2, $h);

  117. draw2digits(30, 2, $m);

  118. < p>// set_4pixel(0, 0, 0, 26, 7);
  119. // set_4pixel(0, 0, 0, 26, 13);

  120. // 創(chuàng)建循環(huán)冗余碼校驗表

  121. $z = -306674912; // = 0xedb88320
  122. for ($n = 0; $n < 256; $n ) {
  123. $c = $n;
  124. for ($k = 0; $k < 8; $ k ) {
  125. $c2 = ($c >> 1) & 0×7fffffff;
  126. if ($c & 1) $c = $z ^ ($c2); else $c = $c2;
  127. }
  128. $crc_table[$n] = $c;
  129. }

  130. // PNG ?? ??

  131. $result = pack(“c*”, 137,80,78,71,13,10,26,10);

  132. // IHDR ?? ???:

  133. // ??: 4???
  134. // ??: 4???
  135. // ?? ??: 1???(RGB ?? 8??)
  136. // ?? ??: 1???(2 = RGB)
  137. // ?? ??: 1???(0 = ??/??)
  138. // ?? ??: 1???(0 = ??? ???)
  139. // ????? ??: 1???(0 = ????? ??)
  140. $data = pack(“c*”, ($sx >> 24) & 255,
  141. ($sx >> 16 ) & 255,
  142. ($sx >> 8) & 255,
  143. $sx & 255,
  144. ($sy >> 24) & 255,
  145. ($sy > > 16) & 255,
  146. ($sy >> 8) & 255,
  147. $sy & 255,
  148. 8,
  149. 2,
  150. 0,
  151. 0,
  152. 0);
  153. add_chunk(“IHDR”);

  154. // 以下不敢亂翻譯，請自行參考

  155. // ????:
  156. / / ?? ???: 0 = ??
  157. // ??? RGB ???
  158. // ????? "zlib"? ?????. ?? 8(RFC-1950):
  159. // ?? ??/??? ??: 1???($78 = ??? 8, 32k ?)
  160. // ?? ???/?? ??: 1???($01: FCHECK = 1, FDICT = 0, FLEVEL = 0)
  161. // ?? ??? ??: n???
  162. // ? ??(RFC-1951):
  163. // ?? 0: BFINAL: ??? ??? ?? 1
  164. // ?? 1 ? 2: BTYPE: ???? ?? 0
  165. // ?? 2???: LEN(LSB ??)
  166. // ?? 2???: LEN? 1? ??
  167. // LEN ??? ??? ???
  168. // ?? ?: 4???(???? ?? ???? Adler-32 ???)
  169. //
  170. $len = ($sx * 3 1) * $sy;
  171. $data = pack(“c*”, 0×78, 0×01,
  172. 1,
  173. $len & 255,
  174. ($len >> 8) & 255,
  175. 255 – ($len & 255),
  176. 255 – (($len >> 8) & 255));
  177. $start = strlen($data);
  178. $i2 = 0;
  179. for ($h = 0; $h $data .= chr(0);
  180. for ($w = 0; $w < $sx * 3; $w ) {
  181. $data .= $pixels[$i2 ];
  182. }
  183. }

  184. // ?? data[start..len-1]

  185. $s1 = 1;
  186. $s2 = 0;
  187. for ($n = $start; $n < strlen($data) ???? Adler32 ??? ); $n ) {
  188. $s1 = ($s1 ord($data[$n])) % 65521;
  189. $s2 = ($s2 $s1) % 65521;
  190. }
  191. $adler = ($s2

    $data .= chr(($adler >> 24) & 255);

  192. $data .= chr(($adler >> 16) & 255);
  193. $data .= chr(($adler >> 8) & 255);
  194. $data .= chr($adler & 255);
  195. add_chunk(“IDAT ”);

  196. // IEND: PNG ??? ?? ??

  197. $data = “”;
  198. add_chunk(“IEND”);

  199. // 列印圖象

  200. echo($result);

  201. ?>

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