/test/-ext-/bignum/test_pack.rb

https://github.com/kosaki/ruby · Ruby · 374 lines · 328 code · 43 blank · 3 comment · 0 complexity · 82f55a178ba8e16b426afd48ae3a6206 MD5 · raw file 

    

  1. # coding: ASCII-8BIT
    2. 

  2. 

  3. require 'test/unit'
    4. 

  4. require "-test-/bignum"
    5. 

  5. 

  6. class TestBignum < Test::Unit::TestCase
    7. 

  7.   class TestPack < Test::Unit::TestCase
    8. 

  8. 

  9.     MSWORD_FIRST = Integer::INTEGER_PACK_MSWORD_FIRST
    10. 

  10.     LSWORD_FIRST = Integer::INTEGER_PACK_LSWORD_FIRST
    11. 

  11.     MSBYTE_FIRST = Integer::INTEGER_PACK_MSBYTE_FIRST
    12. 

  12.     LSBYTE_FIRST = Integer::INTEGER_PACK_LSBYTE_FIRST
    13. 

  13.     NATIVE_BYTE_ORDER = Integer::INTEGER_PACK_NATIVE_BYTE_ORDER
    14. 

  14.     TWOCOMP = Integer::INTEGER_PACK_2COMP
    15. 

  15.     LITTLE_ENDIAN = Integer::INTEGER_PACK_LITTLE_ENDIAN
    16. 

  16.     BIG_ENDIAN = Integer::INTEGER_PACK_BIG_ENDIAN
    17. 

  17.     NEGATIVE = Integer::INTEGER_PACK_NEGATIVE
    18. 

  18.     GENERIC = Integer::INTEGER_PACK_FORCE_GENERIC_IMPLEMENTATION
    19. 

  19. 

  20.     def test_pack_zero
    21. 

  21.       assert_equal([0, ""], 0.test_pack(0, 1, 0, BIG_ENDIAN))
    22. 

  22.     end
    23. 

  23. 

  24.     def test_pack_argument_check
    25. 

  25.       assert_raise(ArgumentError) { 0.test_pack_raw("", 2, 1, 0, MSBYTE_FIRST) }
    26. 

  26.       assert_raise(ArgumentError) { 0.test_pack_raw("", 0, 1, 0, MSWORD_FIRST) }
    27. 

  27.       assert_raise(ArgumentError) { 0.test_pack_raw("", 0, 0, 0, BIG_ENDIAN) }
    28. 

  28.       assert_raise(ArgumentError) { 0.test_pack_raw("", 0, 1, 8, BIG_ENDIAN) }
    29. 

  29. 

  30.       # assume sizeof(ssize_t) == sizeof(intptr_t)
    31. 

  31.       assert_raise(ArgumentError) { 0.test_pack_raw("", 1 << ([""].pack("p").length * 8 - 1), 0, BIG_ENDIAN) }
    32. 

  32.     end
    33. 

  33. 

  34.     def test_pack_wordsize
    35. 

  35.       assert_equal([1, "\x01"], 1.test_pack(1, 1, 0, BIG_ENDIAN))
    36. 

  36.       assert_equal([1, "\x00\x01"], 1.test_pack(1, 2, 0, BIG_ENDIAN))
    37. 

  37.       assert_equal([1, "\x00\x00\x01"], 1.test_pack(1, 3, 0, BIG_ENDIAN))
    38. 

  38.       assert_equal([1, "\x01"], 1.test_pack(1, 1, 0, LITTLE_ENDIAN))
    39. 

  39.       assert_equal([1, "\x01\x00"], 1.test_pack(1, 2, 0, LITTLE_ENDIAN))
    40. 

  40.       assert_equal([1, "\x01\x00\x00"], 1.test_pack(1, 3, 0, LITTLE_ENDIAN))
    41. 

  41.     end
    42. 

  42. 

  43.     def test_pack_fixed_buffer
    44. 

  44.       assert_equal([0, "\x00\x00"], 0.test_pack(2, 1, 0, BIG_ENDIAN))
    45. 

  45.       assert_equal([1, "\x00\x01"], 0x01.test_pack(2, 1, 0, BIG_ENDIAN))
    46. 

  46.       assert_equal([1, "\x02\x01"], 0x0201.test_pack(2, 1, 0, BIG_ENDIAN))
    47. 

  47.       assert_equal([2, "\x02\x01"], 0x030201.test_pack(2, 1, 0, BIG_ENDIAN))
    48. 

  48.       assert_equal([2, "\x02\x01"], 0x04030201.test_pack(2, 1, 0, BIG_ENDIAN))
    49. 

  49.       assert_equal([0, "\x00\x00"], 0.test_pack(2, 1, 0, LITTLE_ENDIAN))
    50. 

  50.       assert_equal([1, "\x01\x00"], 0x01.test_pack(2, 1, 0, LITTLE_ENDIAN))
    51. 

  51.       assert_equal([1, "\x01\x02"], 0x0201.test_pack(2, 1, 0, LITTLE_ENDIAN))
    52. 

  52.       assert_equal([2, "\x01\x02"], 0x030201.test_pack(2, 1, 0, LITTLE_ENDIAN))
    53. 

  53.       assert_equal([2, "\x01\x02"], 0x04030201.test_pack(2, 1, 0, LITTLE_ENDIAN))
    54. 

  54.     end
    55. 

  55. 

  56.     def test_pack_wordorder_and_endian
    57. 

  57.       assert_equal([1, "\x12\x34\x56\x78"], 0x12345678.test_pack(2, 2, 0, MSWORD_FIRST|MSBYTE_FIRST))
    58. 

  58.       assert_equal([1, "\x34\x12\x78\x56"], 0x12345678.test_pack(2, 2, 0, MSWORD_FIRST|LSBYTE_FIRST))
    59. 

  59.       assert_equal([1, "\x56\x78\x12\x34"], 0x12345678.test_pack(2, 2, 0, LSWORD_FIRST|MSBYTE_FIRST))
    60. 

  60.       assert_equal([1, "\x78\x56\x34\x12"], 0x12345678.test_pack(2, 2, 0, LSWORD_FIRST|LSBYTE_FIRST))
    61. 

  61.     end
    62. 

  62. 

  63.     def test_pack_native_endian
    64. 

  64.       assert_equal([1, [0x1234].pack("S!")], 0x1234.test_pack(1, 2, 0, MSWORD_FIRST|NATIVE_BYTE_ORDER))
    65. 

  65.     end
    66. 

  66. 

  67.     def test_pack_nail
    68. 

  68.       assert_equal([1, "\x01\x00\x00\x00\x01\x01"], 0b100011.test_pack(6, 1, 7, BIG_ENDIAN))
    69. 

  69.       assert_equal([1, "\x01\x02\x03\x04\x05\x06\x07\x08"], 0x12345678.test_pack(8, 1, 4, BIG_ENDIAN))
    70. 

  70.       assert_equal([1, "\x00\x12\x00\x34\x00\x56\x00\x78"], 0x12345678.test_pack(4, 2, 8, BIG_ENDIAN))
    71. 

  71.     end
    72. 

  72. 

  73.     def test_pack_overflow
    74. 

  74.       assert_equal([-2, "\x1"], (-0x11).test_pack(1, 1, 4, BIG_ENDIAN))
    75. 

  75.       assert_equal([-2, "\x0"], (-0x10).test_pack(1, 1, 4, BIG_ENDIAN))
    76. 

  76.       assert_equal([-1, "\xF"], (-0x0F).test_pack(1, 1, 4, BIG_ENDIAN))
    77. 

  77.       assert_equal([+1, "\xF"], (+0x0F).test_pack(1, 1, 4, BIG_ENDIAN))
    78. 

  78.       assert_equal([+2, "\x0"], (+0x10).test_pack(1, 1, 4, BIG_ENDIAN))
    79. 

  79.       assert_equal([+2, "\x1"], (+0x11).test_pack(1, 1, 4, BIG_ENDIAN))
    80. 

  80. 

  81.       assert_equal([-2, "\x01"], (-0x101).test_pack(1, 1, 0, BIG_ENDIAN))
    82. 

  82.       assert_equal([-2, "\x00"], (-0x100).test_pack(1, 1, 0, BIG_ENDIAN))
    83. 

  83.       assert_equal([-1, "\xFF"], (-0x0FF).test_pack(1, 1, 0, BIG_ENDIAN))
    84. 

  84.       assert_equal([+1, "\xFF"], (+0x0FF).test_pack(1, 1, 0, BIG_ENDIAN))
    85. 

  85.       assert_equal([+2, "\x00"], (+0x100).test_pack(1, 1, 0, BIG_ENDIAN))
    86. 

  86.       assert_equal([+2, "\x01"], (+0x101).test_pack(1, 1, 0, BIG_ENDIAN))
    87. 

  87. 

  88.       assert_equal([-2, "\x00\x00\x00\x00\x00\x00\x00\x01"], (-0x10000000000000001).test_pack(2, 4, 0, BIG_ENDIAN))
    89. 

  89.       assert_equal([-2, "\x00\x00\x00\x00\x00\x00\x00\x00"], (-0x10000000000000000).test_pack(2, 4, 0, BIG_ENDIAN))
    90. 

  90.       assert_equal([-1, "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF"], (-0x0FFFFFFFFFFFFFFFF).test_pack(2, 4, 0, BIG_ENDIAN))
    91. 

  91.       assert_equal([+1, "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF"], (+0x0FFFFFFFFFFFFFFFF).test_pack(2, 4, 0, BIG_ENDIAN))
    92. 

  92.       assert_equal([+2, "\x00\x00\x00\x00\x00\x00\x00\x00"], (+0x10000000000000000).test_pack(2, 4, 0, BIG_ENDIAN))
    93. 

  93.       assert_equal([+2, "\x00\x00\x00\x00\x00\x00\x00\x01"], (+0x10000000000000001).test_pack(2, 4, 0, BIG_ENDIAN))
    94. 

  94. 

  95.       1.upto(16) {|wordsize|
    96. 

  96.         1.upto(20) {|numwords|
    97. 

  97.           w = numwords*wordsize
    98. 

  98.           n = 256**w
    99. 

  99.           assert_equal([-2, "\x00"*(w-1)+"\x01"], (-n-1).test_pack(numwords, wordsize, 0, BIG_ENDIAN))
    100. 

  100.           assert_equal([-2, "\x00"*w],            (-n  ).test_pack(numwords, wordsize, 0, BIG_ENDIAN))
    101. 

  101.           assert_equal([-1, "\xFF"*w],            (-n+1).test_pack(numwords, wordsize, 0, BIG_ENDIAN))
    102. 

  102.           assert_equal([+1, "\xFF"*w],            (+n-1).test_pack(numwords, wordsize, 0, BIG_ENDIAN))
    103. 

  103.           assert_equal([+2, "\x00"*w],            (+n  ).test_pack(numwords, wordsize, 0, BIG_ENDIAN))
    104. 

  104.           assert_equal([+2, "\x00"*(w-1)+"\x01"], (+n+1).test_pack(numwords, wordsize, 0, BIG_ENDIAN))
    105. 

  105.         }
    106. 

  106.       }
    107. 

  107. 

  108.       1.upto(16) {|wordsize|
    109. 

  109.         1.upto(20) {|numwords|
    110. 

  110.           w = numwords*wordsize
    111. 

  111.           n = 256**w
    112. 

  112.           assert_equal([-2, "\x01"+"\x00"*(w-1)], (-n-1).test_pack(numwords, wordsize, 0, LITTLE_ENDIAN))
    113. 

  113.           assert_equal([-2, "\x00"*w],            (-n  ).test_pack(numwords, wordsize, 0, LITTLE_ENDIAN))
    114. 

  114.           assert_equal([-1, "\xFF"*w],            (-n+1).test_pack(numwords, wordsize, 0, LITTLE_ENDIAN))
    115. 

  115.           assert_equal([+1, "\xFF"*w],            (+n-1).test_pack(numwords, wordsize, 0, LITTLE_ENDIAN))
    116. 

  116.           assert_equal([+2, "\x00"*w],            (+n  ).test_pack(numwords, wordsize, 0, LITTLE_ENDIAN))
    117. 

  117.           assert_equal([+2, "\x01"+"\x00"*(w-1)], (+n+1).test_pack(numwords, wordsize, 0, LITTLE_ENDIAN))
    118. 

  118.         }
    119. 

  119.       }
    120. 

  120.     end
    121. 

  121. 

  122.     def test_pack_sign
    123. 

  123.       assert_equal([-1, "\x01"], (-1).test_pack(1, 1, 0, BIG_ENDIAN))
    124. 

  124.       assert_equal([-1, "\x80\x70\x60\x50\x40\x30\x20\x10"], (-0x8070605040302010).test_pack(8, 1, 0, BIG_ENDIAN))
    125. 

  125.     end
    126. 

  126. 

  127.     def test_pack_orders
    128. 

  128.       [MSWORD_FIRST, LSWORD_FIRST].each {|word_order|
    129. 

  129.         [MSBYTE_FIRST, LSBYTE_FIRST, NATIVE_BYTE_ORDER].each {|byte_order|
    130. 

  130.           1.upto(16) {|wordsize|
    131. 

  131.             1.upto(20) {|numwords|
    132. 

  132.               w = numwords*wordsize
    133. 

  133.               n = 0;
    134. 

  134.               0.upto(w) {|i|
    135. 

  135.                 n |= ((i+1) % 256) << (i*8)
    136. 

  136.               }
    137. 

  137.               assert_equal(n.test_pack(numwords, wordsize, 0, word_order|byte_order|GENERIC),
    138. 

  138.                            n.test_pack(numwords, wordsize, 0, word_order|byte_order),
    139. 

  139.                           "#{'%#x' % n}.test_pack(#{numwords}, #{wordsize}, 0, #{'%#x' % (word_order|byte_order)})")
    140. 

  140.             }
    141. 

  141.           }
    142. 

  142.         }
    143. 

  143.       }
    144. 

  144.     end
    145. 

  145. 

  146.     def test_pack2comp_zero
    147. 

  147.       assert_equal([0, ""], 0.test_pack(0, 1, 0, TWOCOMP|BIG_ENDIAN))
    148. 

  148.     end
    149. 

  149. 

  150.     def test_pack2comp_emptybuf
    151. 

  151.       assert_equal([-2, ""], (-3).test_pack(0, 1, 0, TWOCOMP|BIG_ENDIAN))
    152. 

  152.       assert_equal([-2, ""], (-2).test_pack(0, 1, 0, TWOCOMP|BIG_ENDIAN))
    153. 

  153.       assert_equal([-1, ""], (-1).test_pack(0, 1, 0, TWOCOMP|BIG_ENDIAN))
    154. 

  154.       assert_equal([ 0, ""], 0.test_pack(0, 1, 0, TWOCOMP|BIG_ENDIAN))
    155. 

  155.       assert_equal([+2, ""], 1.test_pack(0, 1, 0, TWOCOMP|BIG_ENDIAN))
    156. 

  156.       assert_equal([+2, ""], 2.test_pack(0, 1, 0, TWOCOMP|BIG_ENDIAN))
    157. 

  157.     end
    158. 

  158. 

  159.     def test_pack2comp_nearly_zero
    160. 

  160.       assert_equal([-1, "\xFE"], (-2).test_pack(1, 1, 0, TWOCOMP|BIG_ENDIAN))
    161. 

  161.       assert_equal([-1, "\xFF"], (-1).test_pack(1, 1, 0, TWOCOMP|BIG_ENDIAN))
    162. 

  162.       assert_equal([ 0, "\x00"], 0.test_pack(1, 1, 0, TWOCOMP|BIG_ENDIAN))
    163. 

  163.       assert_equal([+1, "\x01"], 1.test_pack(1, 1, 0, TWOCOMP|BIG_ENDIAN))
    164. 

  164.       assert_equal([+1, "\x02"], 2.test_pack(1, 1, 0, TWOCOMP|BIG_ENDIAN))
    165. 

  165.     end
    166. 

  166. 

  167.     def test_pack2comp_overflow
    168. 

  168.       assert_equal([-2, "\xF"], (-0x11).test_pack(1, 1, 4, TWOCOMP|BIG_ENDIAN))
    169. 

  169.       assert_equal([-1, "\x0"], (-0x10).test_pack(1, 1, 4, TWOCOMP|BIG_ENDIAN))
    170. 

  170.       assert_equal([-1, "\x1"], (-0x0F).test_pack(1, 1, 4, TWOCOMP|BIG_ENDIAN))
    171. 

  171.       assert_equal([+1, "\xF"], (+0x0F).test_pack(1, 1, 4, TWOCOMP|BIG_ENDIAN))
    172. 

  172.       assert_equal([+2, "\x0"], (+0x10).test_pack(1, 1, 4, TWOCOMP|BIG_ENDIAN))
    173. 

  173.       assert_equal([+2, "\x1"], (+0x11).test_pack(1, 1, 4, TWOCOMP|BIG_ENDIAN))
    174. 

  174. 

  175.       assert_equal([-2, "\xFF"], (-0x101).test_pack(1, 1, 0, TWOCOMP|BIG_ENDIAN))
    176. 

  176.       assert_equal([-1, "\x00"], (-0x100).test_pack(1, 1, 0, TWOCOMP|BIG_ENDIAN))
    177. 

  177.       assert_equal([-1, "\x01"], (-0x0FF).test_pack(1, 1, 0, TWOCOMP|BIG_ENDIAN))
    178. 

  178.       assert_equal([+1, "\xFF"], (+0x0FF).test_pack(1, 1, 0, TWOCOMP|BIG_ENDIAN))
    179. 

  179.       assert_equal([+2, "\x00"], (+0x100).test_pack(1, 1, 0, TWOCOMP|BIG_ENDIAN))
    180. 

  180.       assert_equal([+2, "\x01"], (+0x101).test_pack(1, 1, 0, TWOCOMP|BIG_ENDIAN))
    181. 

  181. 

  182.       assert_equal([-2, "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF"], (-0x10000000000000001).test_pack(2, 4, 0, TWOCOMP|BIG_ENDIAN))
    183. 

  183.       assert_equal([-1, "\x00\x00\x00\x00\x00\x00\x00\x00"], (-0x10000000000000000).test_pack(2, 4, 0, TWOCOMP|BIG_ENDIAN))
    184. 

  184.       assert_equal([-1, "\x00\x00\x00\x00\x00\x00\x00\x01"], (-0x0FFFFFFFFFFFFFFFF).test_pack(2, 4, 0, TWOCOMP|BIG_ENDIAN))
    185. 

  185.       assert_equal([+1, "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF"], (+0x0FFFFFFFFFFFFFFFF).test_pack(2, 4, 0, TWOCOMP|BIG_ENDIAN))
    186. 

  186.       assert_equal([+2, "\x00\x00\x00\x00\x00\x00\x00\x00"], (+0x10000000000000000).test_pack(2, 4, 0, TWOCOMP|BIG_ENDIAN))
    187. 

  187.       assert_equal([+2, "\x00\x00\x00\x00\x00\x00\x00\x01"], (+0x10000000000000001).test_pack(2, 4, 0, TWOCOMP|BIG_ENDIAN))
    188. 

  188. 

  189.       1.upto(16) {|wordsize|
    190. 

  190.         1.upto(20) {|numwords|
    191. 

  191.           w = numwords*wordsize
    192. 

  192.           n = 256**w
    193. 

  193.           assert_equal([-2, "\xFF"*w           ], (-n-1).test_pack(numwords, wordsize, 0, TWOCOMP|BIG_ENDIAN))
    194. 

  194.           assert_equal([-1, "\x00"*w],            (-n  ).test_pack(numwords, wordsize, 0, TWOCOMP|BIG_ENDIAN))
    195. 

  195.           assert_equal([-1, "\x00"*(w-1)+"\x01"], (-n+1).test_pack(numwords, wordsize, 0, TWOCOMP|BIG_ENDIAN))
    196. 

  196.           assert_equal([+1, "\xFF"*w],            (+n-1).test_pack(numwords, wordsize, 0, TWOCOMP|BIG_ENDIAN))
    197. 

  197.           assert_equal([+2, "\x00"*w],            (+n  ).test_pack(numwords, wordsize, 0, TWOCOMP|BIG_ENDIAN))
    198. 

  198.           assert_equal([+2, "\x00"*(w-1)+"\x01"], (+n+1).test_pack(numwords, wordsize, 0, TWOCOMP|BIG_ENDIAN))
    199. 

  199.         }
    200. 

  200.       }
    201. 

  201. 

  202.       1.upto(16) {|wordsize|
    203. 

  203.         1.upto(20) {|numwords|
    204. 

  204.           w = numwords*wordsize
    205. 

  205.           n = 256**w
    206. 

  206.           assert_equal([-2, "\xFF"*w           ], (-n-1).test_pack(numwords, wordsize, 0, TWOCOMP|LITTLE_ENDIAN))
    207. 

  207.           assert_equal([-1, "\x00"*w],            (-n  ).test_pack(numwords, wordsize, 0, TWOCOMP|LITTLE_ENDIAN))
    208. 

  208.           assert_equal([-1, "\x01"+"\x00"*(w-1)], (-n+1).test_pack(numwords, wordsize, 0, TWOCOMP|LITTLE_ENDIAN))
    209. 

  209.           assert_equal([+1, "\xFF"*w],            (+n-1).test_pack(numwords, wordsize, 0, TWOCOMP|LITTLE_ENDIAN))
    210. 

  210.           assert_equal([+2, "\x00"*w],            (+n  ).test_pack(numwords, wordsize, 0, TWOCOMP|LITTLE_ENDIAN))
    211. 

  211.           assert_equal([+2, "\x01"+"\x00"*(w-1)], (+n+1).test_pack(numwords, wordsize, 0, TWOCOMP|LITTLE_ENDIAN))
    212. 

  212.         }
    213. 

  213.       }
    214. 

  214. 

  215.     end
    216. 

  216. 

  217.     def test_unpack_zero
    218. 

  218.       assert_equal(0, Integer.test_unpack("", 0, 1, 0, BIG_ENDIAN))
    219. 

  219.     end
    220. 

  220. 

  221.     def test_unpack_argument_check
    222. 

  222.       assert_raise(ArgumentError) { Integer.test_unpack("x", 2, 1, 0, MSBYTE_FIRST) }
    223. 

  223.       assert_raise(ArgumentError) { Integer.test_unpack("x", 1, 1, 0, MSWORD_FIRST) }
    224. 

  224.       assert_raise(ArgumentError) { Integer.test_unpack("x", 1, 0, 0, BIG_ENDIAN) }
    225. 

  225.       assert_raise(ArgumentError) { Integer.test_unpack("x", 1, 1, 8, BIG_ENDIAN) }
    226. 

  226. 

  227.       # assume sizeof(ssize_t) == sizeof(intptr_t)
    228. 

  228.       assert_raise(ArgumentError) { Integer.test_unpack("x", 1, 1 << ([""].pack("p").length * 8 - 1), 0, BIG_ENDIAN) }
    229. 

  229.     end
    230. 

  230. 

  231.     def test_unpack_wordsize
    232. 

  232.       assert_equal(1, Integer.test_unpack("\x01", 1, 1, 0, BIG_ENDIAN))
    233. 

  233.       assert_equal(1, Integer.test_unpack("\x00\x01", 1, 2, 0, BIG_ENDIAN))
    234. 

  234.       assert_equal(1, Integer.test_unpack("\x00\x00\x01", 1, 3, 0, BIG_ENDIAN))
    235. 

  235.       assert_equal(1, Integer.test_unpack("\x01", 1, 1, 0, LITTLE_ENDIAN))
    236. 

  236.       assert_equal(1, Integer.test_unpack("\x01\x00", 1, 2, 0, LITTLE_ENDIAN))
    237. 

  237.       assert_equal(1, Integer.test_unpack("\x01\x00\x00", 1, 3, 0, LITTLE_ENDIAN))
    238. 

  238.     end
    239. 

  239. 

  240.     def test_unpack_wordorder_and_endian
    241. 

  241.       assert_equal(0x01020304, Integer.test_unpack("\x01\x02\x03\x04", 2, 2, 0, MSWORD_FIRST|MSBYTE_FIRST))
    242. 

  242.       assert_equal(0x02010403, Integer.test_unpack("\x01\x02\x03\x04", 2, 2, 0, MSWORD_FIRST|LSBYTE_FIRST))
    243. 

  243.       assert_equal(0x03040102, Integer.test_unpack("\x01\x02\x03\x04", 2, 2, 0, LSWORD_FIRST|MSBYTE_FIRST))
    244. 

  244.       assert_equal(0x04030201, Integer.test_unpack("\x01\x02\x03\x04", 2, 2, 0, LSWORD_FIRST|LSBYTE_FIRST))
    245. 

  245.     end
    246. 

  246. 

  247.     def test_unpack_native_endian
    248. 

  248.       assert_equal("\x12\x34".unpack("S!")[0], Integer.test_unpack("\x12\x34", 1, 2, 0, MSWORD_FIRST|NATIVE_BYTE_ORDER))
    249. 

  249.     end
    250. 

  250. 

  251.     def test_unpack_nail
    252. 

  252.       assert_equal(0b100011, Integer.test_unpack("\x01\x00\x00\x00\x01\x01", 6, 1, 7, BIG_ENDIAN))
    253. 

  253.       assert_equal(0x12345678, Integer.test_unpack("\x01\x02\x03\x04\x05\x06\x07\x08", 8, 1, 4, BIG_ENDIAN))
    254. 

  254.       assert_equal(0x12345678, Integer.test_unpack("\x00\x12\x00\x34\x00\x56\x00\x78", 4, 2, 8, BIG_ENDIAN))
    255. 

  255.     end
    256. 

  256. 

  257.     def test_unpack_sign
    258. 

  258.       assert_equal(-1, Integer.test_unpack("\x01", 1, 1, 0, BIG_ENDIAN|NEGATIVE))
    259. 

  259.       assert_equal(-0x8070605040302010, Integer.test_unpack("\x80\x70\x60\x50\x40\x30\x20\x10", 8, 1, 0, BIG_ENDIAN|NEGATIVE))
    260. 

  260.     end
    261. 

  261. 

  262.     def test_unpack_orders
    263. 

  263.       [MSWORD_FIRST, LSWORD_FIRST].each {|word_order|
    264. 

  264.         [MSBYTE_FIRST, LSBYTE_FIRST, NATIVE_BYTE_ORDER].each {|byte_order|
    265. 

  265.           1.upto(16) {|wordsize|
    266. 

  266.             1.upto(20) {|numwords|
    267. 

  267.               w = numwords*wordsize
    268. 

  268.               ary = []
    269. 

  269.               0.upto(w) {|i|
    270. 

  270.                 ary << ((i+1) % 256);
    271. 

  271.               }
    272. 

  272.               str = ary.pack("C*")
    273. 

  273.               flags = word_order|byte_order
    274. 

  274.               assert_equal(Integer.test_unpack(str, numwords, wordsize, 0, flags|GENERIC),
    275. 

  275.                            Integer.test_unpack(str, numwords, wordsize, 0, flags),
    276. 

  276.                           "Integer.test_unpack(#{str.dump}, #{numwords}, #{wordsize}, 0, #{'%#x' % flags})")
    277. 

  277.             }
    278. 

  278.           }
    279. 

  279.         }
    280. 

  280.       }
    281. 

  281.     end
    282. 

  282. 

  283.     def test_unpack2comp_single_byte
    284. 

  284.       assert_equal(-128, Integer.test_unpack("\x80", 1, 1, 0, TWOCOMP|BIG_ENDIAN))
    285. 

  285.       assert_equal(  -2, Integer.test_unpack("\xFE", 1, 1, 0, TWOCOMP|BIG_ENDIAN))
    286. 

  286.       assert_equal(  -1, Integer.test_unpack("\xFF", 1, 1, 0, TWOCOMP|BIG_ENDIAN))
    287. 

  287.       assert_equal(   0, Integer.test_unpack("\x00", 1, 1, 0, TWOCOMP|BIG_ENDIAN))
    288. 

  288.       assert_equal(   1, Integer.test_unpack("\x01", 1, 1, 0, TWOCOMP|BIG_ENDIAN))
    289. 

  289.       assert_equal(   2, Integer.test_unpack("\x02", 1, 1, 0, TWOCOMP|BIG_ENDIAN))
    290. 

  290.       assert_equal( 127, Integer.test_unpack("\x7F", 1, 1, 0, TWOCOMP|BIG_ENDIAN))
    291. 

  291.     end
    292. 

  292. 

  293.     def test_unpack2comp_sequence_of_ff
    294. 

  294.       assert_equal(-1, Integer.test_unpack("\xFF"*2, 2, 1, 0, TWOCOMP|BIG_ENDIAN))
    295. 

  295.       assert_equal(-1, Integer.test_unpack("\xFF"*3, 3, 1, 0, TWOCOMP|BIG_ENDIAN))
    296. 

  296.       assert_equal(-1, Integer.test_unpack("\xFF"*4, 4, 1, 0, TWOCOMP|BIG_ENDIAN))
    297. 

  297.       assert_equal(-1, Integer.test_unpack("\xFF"*5, 5, 1, 0, TWOCOMP|BIG_ENDIAN))
    298. 

  298.       assert_equal(-1, Integer.test_unpack("\xFF"*6, 6, 1, 0, TWOCOMP|BIG_ENDIAN))
    299. 

  299.       assert_equal(-1, Integer.test_unpack("\xFF"*7, 7, 1, 0, TWOCOMP|BIG_ENDIAN))
    300. 

  300.       assert_equal(-1, Integer.test_unpack("\xFF"*8, 8, 1, 0, TWOCOMP|BIG_ENDIAN))
    301. 

  301.       assert_equal(-1, Integer.test_unpack("\xFF"*9, 9, 1, 0, TWOCOMP|BIG_ENDIAN))
    302. 

  302.     end
    303. 

  303. 

  304.     def test_unpack2comp_negative_single_byte
    305. 

  305.       assert_equal(-256, Integer.test_unpack("\x00", 1, 1, 0, TWOCOMP|BIG_ENDIAN|NEGATIVE))
    306. 

  306.       assert_equal(-255, Integer.test_unpack("\x01", 1, 1, 0, TWOCOMP|BIG_ENDIAN|NEGATIVE))
    307. 

  307.       assert_equal(-254, Integer.test_unpack("\x02", 1, 1, 0, TWOCOMP|BIG_ENDIAN|NEGATIVE))
    308. 

  308.       assert_equal(-129, Integer.test_unpack("\x7F", 1, 1, 0, TWOCOMP|BIG_ENDIAN|NEGATIVE))
    309. 

  309.       assert_equal(-128, Integer.test_unpack("\x80", 1, 1, 0, TWOCOMP|BIG_ENDIAN|NEGATIVE))
    310. 

  310.       assert_equal(  -2, Integer.test_unpack("\xFE", 1, 1, 0, TWOCOMP|BIG_ENDIAN|NEGATIVE))
    311. 

  311.       assert_equal(  -1, Integer.test_unpack("\xFF", 1, 1, 0, TWOCOMP|BIG_ENDIAN|NEGATIVE))
    312. 

  312.     end
    313. 

  313. 

  314.     def test_unpack2comp_negative_zero
    315. 

  315.       0.upto(100) {|n|
    316. 

  316.         str = "\x00"*n
    317. 

  317.         flags = TWOCOMP|BIG_ENDIAN|NEGATIVE
    318. 

  318.         assert_equal(-(256**n), Integer.test_unpack(str, n, 1, 0, flags))
    319. 

  319.         flags = TWOCOMP|LITTLE_ENDIAN|NEGATIVE
    320. 

  320.         assert_equal(-(256**n), Integer.test_unpack(str, n, 1, 0, flags),
    321. 

  321.                     "Integer.test_unpack(#{str.dump}, #{n}, 1, 0, #{'%#x' % flags})")
    322. 

  322.       }
    323. 

  323.     end
    324. 

  324.   end
    325. 

  325. 

  326.   def test_numbits_2comp
    327. 

  327.     assert_equal(4, -9.test_numbits_2comp_without_sign)
    328. 

  328.     assert_equal(3, -8.test_numbits_2comp_without_sign)
    329. 

  329.     assert_equal(3, -7.test_numbits_2comp_without_sign)
    330. 

  330.     assert_equal(3, -6.test_numbits_2comp_without_sign)
    331. 

  331.     assert_equal(3, -5.test_numbits_2comp_without_sign)
    332. 

  332.     assert_equal(2, -4.test_numbits_2comp_without_sign)
    333. 

  333.     assert_equal(2, -3.test_numbits_2comp_without_sign)
    334. 

  334.     assert_equal(1, -2.test_numbits_2comp_without_sign)
    335. 

  335.     assert_equal(0, -1.test_numbits_2comp_without_sign)
    336. 

  336.     assert_equal(0, 0.test_numbits_2comp_without_sign)
    337. 

  337.     assert_equal(1, 1.test_numbits_2comp_without_sign)
    338. 

  338.     assert_equal(2, 2.test_numbits_2comp_without_sign)
    339. 

  339.     assert_equal(2, 3.test_numbits_2comp_without_sign)
    340. 

  340.     assert_equal(3, 4.test_numbits_2comp_without_sign)
    341. 

  341.     assert_equal(3, 5.test_numbits_2comp_without_sign)
    342. 

  342.     assert_equal(3, 6.test_numbits_2comp_without_sign)
    343. 

  343.     assert_equal(3, 7.test_numbits_2comp_without_sign)
    344. 

  344.     assert_equal(4, 8.test_numbits_2comp_without_sign)
    345. 

  345.     assert_equal(4, 9.test_numbits_2comp_without_sign)
    346. 

  346.   end
    347. 

  347. 

  348.   def test_numbytes_2comp
    349. 

  349.     assert_equal(6, -0x8000000001.test_numbytes_2comp_with_sign)
    350. 

  350.     assert_equal(5, -0x8000000000.test_numbytes_2comp_with_sign)
    351. 

  351.     assert_equal(5, -0x80000001.test_numbytes_2comp_with_sign)
    352. 

  352.     assert_equal(4, -0x80000000.test_numbytes_2comp_with_sign)
    353. 

  353.     assert_equal(4, -0x800001.test_numbytes_2comp_with_sign)
    354. 

  354.     assert_equal(3, -0x800000.test_numbytes_2comp_with_sign)
    355. 

  355.     assert_equal(3, -0x8001.test_numbytes_2comp_with_sign)
    356. 

  356.     assert_equal(2, -0x8000.test_numbytes_2comp_with_sign)
    357. 

  357.     assert_equal(2, -0x81.test_numbytes_2comp_with_sign)
    358. 

  358.     assert_equal(1, -0x80.test_numbytes_2comp_with_sign)
    359. 

  359.     assert_equal(1, -1.test_numbytes_2comp_with_sign)
    360. 

  360.     assert_equal(1, 0.test_numbytes_2comp_with_sign)
    361. 

  361.     assert_equal(1, 1.test_numbytes_2comp_with_sign)
    362. 

  362.     assert_equal(1, 0x7f.test_numbytes_2comp_with_sign)
    363. 

  363.     assert_equal(2, 0x80.test_numbytes_2comp_with_sign)
    364. 

  364.     assert_equal(2, 0x7fff.test_numbytes_2comp_with_sign)
    365. 

  365.     assert_equal(3, 0x8000.test_numbytes_2comp_with_sign)
    366. 

  366.     assert_equal(3, 0x7fffff.test_numbytes_2comp_with_sign)
    367. 

  367.     assert_equal(4, 0x800000.test_numbytes_2comp_with_sign)
    368. 

  368.     assert_equal(4, 0x7fffffff.test_numbytes_2comp_with_sign)
    369. 

  369.     assert_equal(5, 0x80000000.test_numbytes_2comp_with_sign)
    370. 

  370.     assert_equal(5, 0x7fffffffff.test_numbytes_2comp_with_sign)
    371. 

  371.     assert_equal(6, 0x8000000000.test_numbytes_2comp_with_sign)
    372. 

  372.   end
    373. 

  373. 

  374. end
    375.