From 3b313836adc0343dd7449549fe8ef45e67a2a902 Mon Sep 17 00:00:00 2001
From: karim kohel <kareemkohel@gmail.com>
Date: Tue, 16 Jun 2020 17:27:41 +0200
Subject: [PATCH] finilised and documented the code

---
 DCW         | Bin 37848 -> 37248 bytes
 DCW.c       |  11 +++++------
 general.h   |  41 +++++++++++++++++++++++++++++------------
 hashtable.h |   7 ++++---
 linkedQ.h   |  27 +++++++++++++++------------
 main.h      |   7 ++++---
 tree.h      |   3 +++
 7 files changed, 60 insertions(+), 36 deletions(-)

diff --git a/DCW b/DCW
index 6c367ce6b7d7db1484af84aaa3390038a81b470f..ad101374660cfb5c567731779dba2961cd478c8a 100755
GIT binary patch
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diff --git a/DCW.c b/DCW.c
index 2520d3c..639f52c 100644
--- a/DCW.c
+++ b/DCW.c
@@ -2,7 +2,6 @@
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
-// #include <assert.h>
 #include "errhandling.h"
 #include "linkedQ.h"
 #include "tree.h"
@@ -10,15 +9,15 @@
 #include "general.h"
 #include "main.h"
 
+//				----The Delightful Compression Wizard----
 //
-//								WELCOME
-// for documentation, developement and commit history, the github repo
+// for Usage, documentation, developement and commit history, the github repo
 // github.com/karimkohel/DCW should be publically available
 // by the time of this review.
 //
 // NOTICE: 
-//	-to build on Visual Studio, the header files should be pointed to in the project properties
-//		menu under C/C++ > all options > include directories.
+//	-to build on Visual Studio: the header files should be pointed to in the project properties
+//		menu under C/C++ > all options -> additional include directories.
 //
 //	-and to turn off the extra security checks by adding _CRT_SECURE_NO_WARNINGS into the
 //		preprocessor definitions in project > project properties > C/C++ > preprocessor.
@@ -30,7 +29,7 @@
 //		-> mohamed osama
 //		-> aly khaled anas
 //		-> omar tamer
-//
+//		-> amr mekky
 //
 
 
diff --git a/general.h b/general.h
index 479d27c..599bb34 100644
--- a/general.h
+++ b/general.h
@@ -30,7 +30,7 @@ int greet(){
 }
 
 void load_file_in(Q_t *q, FILE *file, long  *count){
-
+	//loads the input file in the priority Q as a frequency table
 	char c;
 	long  counter = 0;
 	long  wait = 10000000;
@@ -77,8 +77,8 @@ void encode_tree(node_t *node, char code[], char *codes_table[]){
 		return; // base exit case for children of leaf nodes
 
 	if(leaf_node(node))
-		codes_table[((int)node->data)] = code;
-
+		codes_table[((int)node->data)] = code;// place the code of that char in it's equvilant ascii number
+												// as a table index
 
 	encode_tree(node->left, strcat2(code, "0"), codes_table);
 	encode_tree(node->right, strcat2(code, "1"), codes_table);
@@ -92,11 +92,13 @@ void get_codes(node_t *root, char *table[]){
 	tmp_code[0] = '\0';
 	encode_tree(root, tmp_code, table);
 
-	// print_table(table);
+	// print_table(table); // can be used for debugging and checking out the codes table
 }
 
 node_t *load_in_tree(Q_t *q){
 
+	//handles the steps of creating the tree by deQing and enQing and returns the last node to enter the Q
+
 	node_t *tmp_node1 = NULL;
 	node_t *tmp_node2 = NULL;
 	node_t *joined_node = NULL;
@@ -109,6 +111,7 @@ node_t *load_in_tree(Q_t *q){
 }
 
 void trim_str(char *str, int offset){
+	//trims the string from the beginning up to a certain offset
     int len = strlen(str);
     for(int i=0; i<(len-offset+1); i++){
         str[i] = str[offset+i];
@@ -123,7 +126,7 @@ int encode_file(FILE *in_file, char *table[], int tree_hight, FILE *comp_file, c
 	char in_c;
 	int out_c;
 	char out_c2;
-	char *buffer = (char *)malloc(tree_hight*tree_hight*sizeof(char));
+	char *buffer = (char *)malloc(tree_hight*tree_hight*sizeof(char));//buffer to store bits of the codes combined
 	buffer[0] = '\0'; // the string starts with garbage value for some reason
 	char tmp[9];
 	int len;
@@ -135,7 +138,7 @@ int encode_file(FILE *in_file, char *table[], int tree_hight, FILE *comp_file, c
 
 		while(len > 7){
 			strncpy(tmp, buffer, BYTE_SIZE);
-			out_c = strtol(tmp, 0, 2);
+			out_c = strtol(tmp, 0, 2); // converts from binary to decimal
 			out_c2 = out_c;
 			fwrite(&out_c2, sizeof(char), 1, comp_file);
 			trim_str(buffer, BYTE_SIZE);
@@ -144,11 +147,12 @@ int encode_file(FILE *in_file, char *table[], int tree_hight, FILE *comp_file, c
 		}
 	}
 
-	*extra_bits = buffer;
+	*extra_bits = buffer;//return the extra bits by refrence to be written sepperatly in the start of file
 	return count;
 }
 
 void write_extra_bits(FILE *file, char *bits){
+	// write the extra bits to a file
 	int len = strlen(bits);
 	for(int i=0; i<len+1; i++){
 		fwrite(&bits[i], sizeof(char), 1, file);
@@ -156,11 +160,10 @@ void write_extra_bits(FILE *file, char *bits){
 }
 
 void serialize(node_t *root, FILE *file){
+	// serializes the tree in the file 
  
-    if (root == NULL){ 
-        // fwrite(root, sizeof(node_t), 1, file);
-        return; 
-    } 
+    if(root == NULL)
+        return;
   
     fwrite(root, sizeof(node_t), 1, file);
     serialize(root->left, file); 
@@ -180,6 +183,7 @@ void deserialize(node_t *root, FILE *file) {
 }
 
 void get_extra_bits(FILE *file, char *bits){
+	// reads the extra bits from a file
 	for(int i=0; i<BYTE_SIZE; i++){
 		fread(&bits[i], sizeof(char), 1, file);
 		if(bits[i] == '\0')
@@ -188,7 +192,8 @@ void get_extra_bits(FILE *file, char *bits){
 }
 
 void atob(char* buffer, int c){
-	//(CRDTS)//got the function idea from https://www.programmingsimplified.com/c/source-code/c-program-convert-decimal-to-binary
+	//(CRDTS)
+	//got the function idea from https://www.programmingsimplified.com/c/source-code/c-program-convert-decimal-to-binary
 	// had to learn about binary operators and shifting bits,
 	// bitwise and all around to pull this off
 	// the awesome name i gave this function however is 100% mine
@@ -206,6 +211,11 @@ void atob(char* buffer, int c){
 }
 
 char decode(char *bits, node_t *root, int *offset){
+	//given a string of bits with length above the max code length,
+	// will travers down the deserialized tree we got back in the direction of
+	// the the code bit by bit until a leaf node is found, trims the used up code for the 
+	// string that lead to this node then reterns the character in the node 
+	// and the offset of how much bits it took ;
 
 	int len = strlen(bits);
 	int j = 1;
@@ -231,6 +241,10 @@ char decode(char *bits, node_t *root, int *offset){
 
 void get_bits(node_t *root, FILE *comp_file, int tree_h, FILE *out_file, char *extra_bits){
 
+	//reads the compressed file and whenever the number of bits generated from the characters in it
+	//	is above the hight of the tree we decode the bits and write the character in the resulting 
+	//	decompressed file
+
 	char c;
 	char out_c;
 	char *bits = (char *)malloc(sizeof(char)*tree_h*tree_h);
@@ -259,6 +273,9 @@ void get_bits(node_t *root, FILE *comp_file, int tree_h, FILE *out_file, char *e
 		}
 	}
 
+	//then the exra bits are added to whats left of the bits generated and untill they are
+	//	finished we find the characeters they code
+
 	strcat(bits, extra_bits);
 	len = strlen(bits);
 
diff --git a/hashtable.h b/hashtable.h
index 57162d7..258310f 100644
--- a/hashtable.h
+++ b/hashtable.h
@@ -4,7 +4,7 @@
 #define TABLESIZE 255
 
 // while thinking that a map is the best solution to store huffman codes with a O(1) acces time
-// as the app must acces the codes so much times and speed is of the essence.
+// as the app must acces the codes so much and time is of the essence.
 // i found out that i don't have to implement a hash function for my table, i can just use the ascii
 // table indices instead of hashing my own. what a nifty little hack.
 
@@ -17,14 +17,15 @@ void init_table(char *table[]){
 
 void print_table(char *table[]){
 	for(int i=0; i<TABLESIZE; i++){
-		if(table[i] != NULL)
+		if(table[i])
 			printf("%d - %s - %c\n", i, table[i], i);
 	}
 }
 
 void free_table(char *table[]){
 	for(int i=0; i<TABLESIZE; i++){
-		free(table[i]);
+		if(table[i])
+			free(table[i]);
 	}
 }
 
diff --git a/linkedQ.h b/linkedQ.h
index 081721d..be52e5c 100644
--- a/linkedQ.h
+++ b/linkedQ.h
@@ -93,15 +93,6 @@ void sort_list(node_t *head){
 	}
 }
 
-// void free_list(node_t *head){
-// 	node_t *tmp;
-// 	while(head != NULL){
-// 		tmp = head;
-// 		head = head->next;
-// 		free(tmp);
-// 	}
-// }
-
 bool insert_node_first(node_t **head, node_t *node){
 	if((*head) == NULL || node == NULL)
 		return false;
@@ -126,6 +117,15 @@ bool remove_node_first(node_t **head, node_t **node){
 	return true;
 }
 
+// void free_list(node_t *head){
+// 	node_t *tmp;
+// 	while(head != NULL){
+// 		tmp = head;
+// 		head = head->next;
+// 		free(tmp);
+// 	}
+// }
+
 //////////////////////// END OF LINKED LIST DS //////////////////
 ///////////////////// Q DS USING LINKED LIST ///////////////////
 
@@ -138,9 +138,10 @@ typedef struct Q_t{
 		tail = NULL;
 	}
 
-	~Q_t(){
-		// free_list(head);
-	}
+	// ~Q_t(){
+	// 	free_list(head);
+	// }
+
 }Q_t;
 
 bool enQ(Q_t* q, char item, node_t *node){
@@ -175,6 +176,8 @@ bool enQ(Q_t* q, char item, node_t *node){
 
 bool deQ(Q_t* q, node_t **node){
 
+	// when the Q is empty, will return false to stop the deQing and set the garbage node to NULL;
+
 	if(q->head == NULL){
 		(*node) = NULL;
 		return false;
diff --git a/main.h b/main.h
index 089fb09..feb5c8b 100644
--- a/main.h
+++ b/main.h
@@ -6,6 +6,7 @@ void compress(const char *in_file_name, const char *out_file_name){
 	clock_t start_time = clock();
 
 	Q_t q;
+
 	FILE *in_file = fopen(in_file_name, "rb");
 	fcheck(in_file, 1);
 	FILE *out_file = fopen(out_file_name, "wb");
@@ -28,15 +29,15 @@ void compress(const char *in_file_name, const char *out_file_name){
 
 	int tree_hight = find_hight(tree_root);
 
-	char buffer[8] = "0000000";
-	write_extra_bits(out_file, buffer);
+	char buffer[8] = "0000000"; // this buffer holds a place in the beginning of the file for the
+	write_extra_bits(out_file, buffer);// extra bits that we will put in later
 
 	serialize(tree_root, out_file);
 
 	char *extra_bits;
 	int out_count = encode_file(in_file, code_table, tree_hight, out_file, &extra_bits);
 
-	fseek(out_file, 0, SEEK_SET);
+	fseek(out_file, 0, SEEK_SET);// seek to start and place the extra bits we got
 	write_extra_bits(out_file, extra_bits);
 
 
diff --git a/tree.h b/tree.h
index 8f6749d..b341360 100644
--- a/tree.h
+++ b/tree.h
@@ -11,6 +11,8 @@ bool leaf_node(node_t *node){
 
 node_t *join_nodes(node_t *node1, node_t *node2){
 
+	// take 2 nodes, join them as siblings under one parant, simple.
+
 	node_t *new_node = create_node('\0');
 	if(new_node == NULL)
 		return NULL;
@@ -36,6 +38,7 @@ void printPostorder(node_t *root){
 }
 
 void free_tree(node_t *node){
+	// no memory waste what so ever
 	if(node == NULL)
 		return;