From 7f60ea012dd2524dae921a2a35adbf7ef21f2bb6 Mon Sep 17 00:00:00 2001
From: prashantsinalkar
Date: Tue, 10 Oct 2017 12:27:19 +0530
Subject: initial commit / add all books

---
 3544/CH6/EX6.54/Ex6_54.sce | 55 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 3544/CH6/EX6.54/Ex6_54.sce

(limited to '3544/CH6/EX6.54/Ex6_54.sce')

diff --git a/3544/CH6/EX6.54/Ex6_54.sce b/3544/CH6/EX6.54/Ex6_54.sce
new file mode 100644
index 000000000..6e76847b4
--- /dev/null
+++ b/3544/CH6/EX6.54/Ex6_54.sce
@@ -0,0 +1,55 @@
+
+//Base 64 encoding example
+
+[u,t,n] = file()
+n = strcat(n)
+file_name = basename(n)+fileext(n)
+file_name = strcat(file_name)
+ind=strindex(n,file_name)
+path = part(n,1:ind-1)
+chdir(path)
+
+//Get function to create encoding table
+exec("Chapter_6.sci",-1)
+
+enc = encoding_table()
+
+inp = "001000110101110010010001"        // Input
+disp("24-bit input:")
+disp(inp)
+disp("")
+dec = []
+
+for i=1:length(inp)/6                       //Convert to 6-bit packets stored as
+    str = part(inp,((i-1)*6+1):((i-1)*6+6)) //integers
+    dec(i)=0
+    for j=1:length(str)
+        if part(str,j:j)=='1' then
+            dec(i) = dec(i)+2^(6-j)
+        end
+    end
+end
+
+disp("Divided into 6-bit blocks:")
+disp(dec2bin(dec'))
+disp("")
+
+disp("Decimal equivalents:")                
+disp(dec')                                  //Decimal equivalents
+disp("")
+dec_str = []
+
+for i=1:length(dec)
+    dec_str(i) = (ascii(enc(dec(i)+1)))
+end
+
+disp("Map to base-64 encoding table (shown in Fig. 6.55):")
+disp(dec_str')                              //Character values from encoding table
+disp("")
+dec_str = ascii(dec_str)
+
+bin_str = dec2bin(dec_str)                  //Convert to ASCII binary
+bin_str = string(bin_str)
+bin_str = '0'+bin_str                       //Convert to 8-bit from 7-bit
+disp("ASCII equivalent binary")
+disp(bin_str)
-- 
cgit