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Diffstat (limited to 'C_Programming:_A_Modern_Approach_by_K.N._King/Chapter20.ipynb')
| -rwxr-xr-x | C_Programming:_A_Modern_Approach_by_K.N._King/Chapter20.ipynb | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/C_Programming:_A_Modern_Approach_by_K.N._King/Chapter20.ipynb b/C_Programming:_A_Modern_Approach_by_K.N._King/Chapter20.ipynb new file mode 100755 index 00000000..10d6049f --- /dev/null +++ b/C_Programming:_A_Modern_Approach_by_K.N._King/Chapter20.ipynb @@ -0,0 +1,161 @@ +{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:4a14f929c77abfd0a54b26e2baa48a2c7f478d22968a4f6231afc128a12dd480"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "Chapter 20: Low-Level Programming"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example xor.c, Page 515"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "KEY='&'\n",
+ "orig=raw_input()\n",
+ "orig_char=list(orig)\n",
+ "new_char=[]\n",
+ "\n",
+ "def sxor(s1,s2): \n",
+ " return ''.join(chr(ord(a) ^ ord(b)) for a,b in zip(s1,s2))\n",
+ "for i in orig_char:\n",
+ " N=sxor(i,KEY)\n",
+ " new_char.append(N)\n",
+ "print ''.join(new_char)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Trust not him with your secrets, who, when left alone in your room, turns over your papers. Johann Kaspar Lavater \n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "rTSUR\u0006HIR\u0006NOK\u0006QORN\u0006_IST\u0006UCETCRU\n",
+ "\u0006QNI\n",
+ "\u0006QNCH\u0006JC@R\u0006GJIHC\u0006OH\u0006_IST\u0006TIIK\n",
+ "\u0006RSTHU\u0006IPCT\u0006_IST\u0006VGVCTU\b\u0006lINGHH\u0006mGUVGT\u0006jGPGRCT\u0006\n"
+ ]
+ }
+ ],
+ "prompt_number": 17
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example viewmemory.c, Page 521"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "from itertools import product\n",
+ "def main():\n",
+ " \n",
+ " addr=\"\"\n",
+ " i=0\n",
+ " n=0\n",
+ " print \"Address of main function: %s\" % hex(id(main))\n",
+ " print \"Address of addr variable: %s\" % hex(id(addr))\n",
+ " addr=raw_input( \"Enter a (hex) address: \")\n",
+ " n=int(raw_input( \"Enter number of bytes to view: \"))\n",
+ " #printf(\"\\n\");\n",
+ " print \" Address Bytes Characters\\n\"\n",
+ " print \" - - - - - - - - - - - - - - - - - - - - - - \"\n",
+ " ptr = addr;\n",
+ " for nn in range(n,0,-10):\n",
+ " print \"%8s \"% hex(id(addr))\n",
+ " # for i,i in product(range(0//10), range(0//n)) :\n",
+ " #print \"%.2X \", *(ptr + i)); \n",
+ " #for (; i <10; i++)\n",
+ " # printf(\" \"); #pointer dereferencing not in python\n",
+ " #printf(\" \");\n",
+ " #for (i = 0; i < 10 && i < n; i++) {\n",
+ " # BYTE ch = *(ptr + i);\n",
+ " #if (!isprint(ch))\n",
+ " # ch = '.';\n",
+ " # printf(\"%c\", ch);\n",
+ " #}\n",
+ " #printf(\"\\n\");\n",
+ " #ptr += 10;\n",
+ " #} \n",
+ " #return 0;\n",
+ " #}\n",
+ "if __name__=='__main__':\n",
+ " main()"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Address of main function: 0x4117eb8L\n",
+ "Address of addr variable: 0x1c3c148L\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter a (hex) address: 8048000\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter number of bytes to view: 40\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " Address Bytes Characters\n",
+ "\n",
+ " - - - - - - - - - - - - - - - - - - - - - - \n",
+ "0x41884b8L \n",
+ "0x41884b8L \n",
+ "0x41884b8L \n",
+ "0x41884b8L \n"
+ ]
+ }
+ ],
+ "prompt_number": 11
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+}
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