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+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
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+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..60db284
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,15 @@
+CC=gcc
+CFLAGS=-O3 -march=native -pipe
+
+OBJ = main.o stdin.o encode.o decode.o
+HEADERS = main.h decode.h
+
+%.o: %.c $(DEPS) $(HEADERS)
+	$(CC) -c -o $@ $< $(CFLAGS)
+
+base64: $(OBJ)
+	$(CC) -o $@ $^ $(CFLAGS)
+
+clean:
+	rm $(OBJ)
+	rm base64
diff --git a/decode.c b/decode.c
new file mode 100644
index 0000000..3368e3c
--- /dev/null
+++ b/decode.c
@@ -0,0 +1,151 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <limits.h>	//for CHAR_BIT
+#include "decode.h"//for stripNewlines()
+
+//macros for writing bits
+#define BITMASK(b) (1 << ((b) % CHAR_BIT))
+#define BITSLOT(b) ((b) / CHAR_BIT)
+#define BITSET(a, b) ((a)[BITSLOT(b)] |= BITMASK(b))
+#define BITCLEAR(a, b) ((a)[BITSLOT(b)] &= ~BITMASK(b))
+//#define BITTEST(a, b) ((a)[BITSLOT(b)] & BITMASK(b))
+//#define BITNSLOTS(nb) ((nb + CHAR_BIT - 1) / CHAR_BIT)
+
+//base64Decode: Decodes base64 into binary output data. Takes a pointer to a '\0' terminated input string and the size of the string, not including '\0' (e.g. strlen(string))
+int base64Decode(unsigned char *string, int size)
+{
+if (!size){return -1;}//Catches the case of feeding the function a negative or 0 length.
+
+//strip newlines from input string, since handling them in body is too painful/slow
+size = stripNewlines(string, size);
+//printf("%d\n", size);
+//printf("%s\n", string);
+//printf("%d\n", size%4);
+
+if (size % 4 != 0){return -1;}//if the number of base64 characters sent can't be perfectly divided by 4, the base64 string is invalid.
+
+int base64value;//input char converted to it's matching base64 value
+int i;//i is located at the position of the char currently being processed
+
+int outputPos = 0;//i and the output string doesn't match up
+
+//needs +1 to work "correctly" (for 4 chars anyway)
+for (i=0; i+1<size;++i)
+	{
+	//check that string[i] is a valid base64 char, then convert it to the integer value.
+	if ((string[i] <= 'z')&&(string[i] >= 'a')){base64value = string[i] - 71; goto firstChar;}
+	if ((string[i] <= 'Z')&&(string[i] >= 'A')){base64value = string[i] - 65; goto firstChar;}
+	if ((string[i] <= '9')&&(string[i] >= '0')){base64value = string[i] + 4; goto firstChar;}
+	if (string[i] == '+'){base64value = 62; goto firstChar;}
+	if (string[i] == '/'){base64value = 63; goto firstChar;}
+	else{return -1;}//not a base64 character
+
+	firstChar:; //printf("%d\n", base64value);
+
+	//clear the output byte ready for bitset
+	string[outputPos] = '\0';
+
+/*
+	|   string[0]   |
+	|X|X|X|X|X|X|X|X|
+	|7|6|5|4|3|2|1|0|
+	|-|-|-|-|-|-|
+*/
+	//bitset the output char to the correct value
+	if (base64value >= 32){BITSET(string+outputPos,7); base64value -= 32;}//if base64value >= 32, the h
+	if (base64value >= 16){BITSET(string+outputPos,6); base64value -= 16;}
+	if (base64value >= 8){BITSET(string+outputPos,5); base64value -= 8;}
+	if (base64value >= 4){BITSET(string+outputPos,4); base64value -= 4;}
+	if (base64value >= 2){BITSET(string+outputPos,3); base64value -= 2;}
+	if (base64value >= 1){BITSET(string+outputPos,2);}
+
+	++i;
+	if ((string[i] <= 'z')&&(string[i] >= 'a')){base64value = string[i] - 71; goto secondChar;}
+	if ((string[i] <= 'Z')&&(string[i] >= 'A')){base64value = string[i] - 65; goto secondChar;}
+	if ((string[i] <= '9')&&(string[i] >= '0')){base64value = string[i] + 4; goto secondChar;}
+	if (string[i] == '+'){base64value = 62; goto secondChar;}
+	if (string[i] == '/'){base64value = 63; goto secondChar;}
+	else{return -1;}//not a base64 character
+
+	secondChar:; //printf("%d\n", base64value);
+
+/*	|   string0]   |
+	|7|6|5|4|3|2|1|0|
+		    |-|-|
+*/
+	if (base64value >= 32){BITSET(string+outputPos,1); base64value -= 32;}
+	if (base64value >= 16){BITSET(string+outputPos,0); base64value -= 16;}
+	++outputPos;
+
+	//clear the output byte ready for bitset
+	string[outputPos] = '\0';
+
+/*	|   string[0]   |   string[1]   |
+	|7|6|5|4|3|2|1|0|7|6|5|4|3|2|1|0|
+			|-|-|-|-|
+*/
+	//bits 4-7 of second char
+	if (base64value >= 8){BITSET(string+outputPos,7); base64value -= 8;}
+	if (base64value >= 4){BITSET(string+outputPos,6); base64value -= 4;}
+	if (base64value >= 2){BITSET(string+outputPos,5); base64value -= 2;}
+	if (base64value >= 1){BITSET(string+outputPos,4);}
+
+
+	++i;
+	if ((string[i] <= 'z')&&(string[i] >= 'a')){base64value = string[i] - 71; goto thirdChar;}
+	if ((string[i] <= 'Z')&&(string[i] >= 'A')){base64value = string[i] - 65; goto thirdChar;}
+	if ((string[i] <= '9')&&(string[i] >= '0')){base64value = string[i] + 4; goto thirdChar;}
+	if (string[i] == '+'){base64value = 62; goto thirdChar;}
+	if (string[i] == '/'){base64value = 63; goto thirdChar;}
+	if (string[i] == '='){return outputPos;}//if padding character detected, just return
+	else{return -1;}//not a base64 character
+
+	thirdChar:; //printf("%d\n", base64value);
+
+
+/*	|   string[0]   |   string[1]   |
+	|7|6|5|4|3|2|1|0|7|6|5|4|3|2|1|0|
+				|-|-|-|-|
+*/
+	if (base64value >= 32){BITSET(string+outputPos,3); base64value -= 32;}
+	if (base64value >= 16){BITSET(string+outputPos,2); base64value -= 16;}
+	if (base64value >= 8){BITSET(string+outputPos,1); base64value -= 8;}
+	if (base64value >= 4){BITSET(string+outputPos,0); base64value -= 4;}
+	++outputPos;
+
+	//clear the output byte ready for bitset
+	string[outputPos] = '\0';
+
+/*	|   string[0]   |   string[1]   | string[2]     |
+	|7|6|5|4|3|2|1|0|7|6|5|4|3|2|1|0|7|6|5|4|3|2|1|0|
+					|-|-|
+*/
+	if (base64value >= 2){BITSET(string+outputPos,7); base64value -= 2;}
+	if (base64value >= 1){BITSET(string+outputPos,6); --base64value;}
+
+	++i;
+	if ((string[i] <= 'z')&&(string[i] >= 'a')){base64value = string[i] - 71; goto forthChar;}
+	if ((string[i] <= 'Z')&&(string[i] >= 'A')){base64value = string[i] - 65; goto forthChar;}
+	if ((string[i] <= '9')&&(string[i] >= '0')){base64value = string[i] + 4; goto forthChar;}
+	if (string[i] == '+'){base64value = 62; goto forthChar;}
+	if (string[i] == '/'){base64value = 63; goto forthChar;}
+	if (string[i] == '='){return outputPos;}//if padding character detected, just return
+	else{return -1;}//not a base64 character
+
+	forthChar:; //printf("%d\n", base64value);
+
+/*	|   string[0]   |   string[1]   | string[2]     |
+	|7|6|5|4|3|2|1|0|7|6|5|4|3|2|1|0|7|6|5|4|3|2|1|0|
+					    |-|-|-|-|-|-|
+*/
+	if (base64value >= 32){BITSET(string+outputPos,5); base64value -= 32;}
+	if (base64value >= 16){BITSET(string+outputPos,4); base64value -= 16;}
+	if (base64value >= 8){BITSET(string+outputPos,3); base64value -= 8;}
+	if (base64value >= 4){BITSET(string+outputPos,2); base64value -= 4;}
+	if (base64value >= 2){BITSET(string+outputPos,1); base64value -= 2;}
+	if (base64value >= 1){BITSET(string+outputPos,0);}
+	++outputPos;
+	}
+
+return outputPos;
+}
diff --git a/decode.h b/decode.h
new file mode 100644
index 0000000..252fa4e
--- /dev/null
+++ b/decode.h
@@ -0,0 +1,20 @@
+#ifndef DECODE_H
+#define DECODE_H
+
+//stripNewlines: Takes a pointer to a null terminated string and the size of the string, removes the newlines and returns the new size.
+int stripNewlines(char *string, int size)
+{
+int a,s;//loop variables
+	for (a=0; a<size; ++a)//loop until the entirely of the string has been gone over
+	{
+		if (string[a] == '\n')
+        		{
+			for (s=a;s<size;++s){string[s]=string[s+1];}//shift all characters above newline left 1, overwriting it
+        		--size;//deincrement size since a character was removed
+        		--a;//the next char may be a newline, so deincrement a to check it
+			}
+	}
+return size;
+}
+
+#endif
diff --git a/encode.c b/encode.c
new file mode 100644
index 0000000..2aba6cc
--- /dev/null
+++ b/encode.c
@@ -0,0 +1,70 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+//base64Encode: Encodes binary input data into base64. Takes a pointer to a '\0' terminated input string and the size of the string, not including '\0' (e.g. strlen(string))
+//Returns pointer to '\0' terminated string on success. Returns NULL if size of input string is zero, or if malloc fails
+char *base64Encode(unsigned char *input, int size)
+{
+char index64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";//lookup table for base64 characters
+
+if (!size){return NULL;}//Catches the case of feeding the function a negative or 0 length.
+unsigned char *output = malloc( (((size + 2) / 3) << 2)+1 * sizeof(unsigned char) );//malloc output to the correct size. (length in input string +33%, rounded up to whole number) (+1 for added null char)
+if (!output){fprintf(stderr,"Malloc Failed!\n"); return NULL;}
+
+int base64Val;//base64Val is the base64 value resulted when all matching bits values are added together
+int i = 0;//i is located at the position of the char currently being processed
+
+int outputPos = 0;//i and the output string of base64 characters don't match up
+
+while (size)//keep looping until all characters have been processed
+{
+	base64Val=0;
+	if (input[i] & 4){++base64Val;}
+	if (input[i] & 8){base64Val += 2;}
+	if (input[i] & 16){base64Val += 4;}
+	if (input[i] & 32){base64Val += 8;}
+	if (input[i] & 64){base64Val += 16;}
+	if (input[i] & 128){base64Val += 32;}
+	output[outputPos++] = index64[base64Val];//the resulting base64 char is placed into output and then outputPos is incremented to the next position for the next char
+
+	//this code may need to read into the NULL char, so it's imporant that the NULL char is there to prevent reading past the buffer
+	++i;
+	base64Val=0;
+	if (input[i] & 16){++base64Val;}
+	if (input[i] & 32){base64Val += 2;}
+	if (input[i] & 64){base64Val += 4;}
+	if (input[i] & 128){base64Val += 8;}
+	if (input[i-1] & 1){base64Val += 16;}
+	if (input[i-1] & 2){base64Val += 32;}
+	output[outputPos++] = index64[base64Val];
+	//even if there are no more characters to process at this stage; "===" is not permitted, "A==" should be printed instead
+	if ((size == 1)){output[outputPos] = '='; output[outputPos+1] = '='; output[outputPos+2] = '\0'; return output;}
+
+	//read the six bits from one before i and then read the two upper bits as 1 and 2
+	++i;
+	base64Val=0;
+	if (input[i] & 64){++base64Val;}
+	if (input[i] & 128){base64Val += 2;}
+	if (input[i-1] & 1){base64Val += 4;}
+	if (input[i-1] & 2){base64Val += 8;}
+	if (input[i-1] & 4){base64Val += 16;}
+	if (input[i-1] & 8){base64Val += 32;}
+	output[outputPos++] = index64[base64Val];
+	if (size == 2){output[outputPos] = '=';  output[outputPos+1] = '\0'; return output;}//if are two letters left at here; "=\0" should be printed
+
+	base64Val=0;
+	if (input[i] & 1){++base64Val;}
+	if (input[i] & 2){base64Val += 2;}
+	if (input[i] & 4){base64Val += 4;}
+	if (input[i] & 8){base64Val += 8;}
+	if (input[i] & 16){base64Val += 16;}
+	if (input[i] & 32){base64Val += 32;}
+	output[outputPos++] = index64[base64Val];
+
+	++i;//process next i char
+	size -= 3;//3 from length since 24 bits (3 chars) are processed at once
+}
+
+output[outputPos] = '\0';
+return output;
+}
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..5a51fbc
--- /dev/null
+++ b/main.c
@@ -0,0 +1,155 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h> //just for ENOENT
+#include <sys/stat.h> //just to check for folder
+#include "main.h"
+
+int main(int argc, char *argv[])
+{
+bool decode = false; //decoding is set to false by default (default is to encode)
+
+//malloc the buffer to store the input string in
+unsigned char *buffer = malloc(DEFAULT_SIZE*sizeof(unsigned char));
+if (!buffer){fprintf(stderr,"Malloc Failed!\n"); exit(1);}
+int size = DEFAULT_SIZE-1;//-1 to account for the added NULL char
+
+//wrap encoded lines after COLS character (default 76).
+int wrap = WRAP_CHAR;
+
+//Go into stdin mode if there are no cli args
+if (argc == 1){stdinMode(buffer, wrap, decode, argv[0]);}//stdinmode is given a pointer to the input string and addittionally the amount of chars to wrap whether default or user set
+
+//arguments processing
+int argvPos = 1;
+
+while ((argv[argvPos]) && (argv[argvPos][0] == '-'))
+{
+if (argv[argvPos][1] == '-')
+	{
+	if ((memcmp(argv[argvPos],"--wrap=",7)) == 0)
+		{
+		wrap = atoi(argv[argvPos]+7);//overwrite the default wrap size with the new supplied one
+		if (wrap < 0){printf("%s: invalid wrap size: \'%s\'\n", argv[0], argv[argvPos]+7); exit(1);}//if atoi() returns negative, the input wasn't a positive int
+		goto nextArgument;
+		}
+
+	if ((memcmp(argv[argvPos],"--decode",8)) == 0)
+		{
+		decode = true;
+		goto nextArgument;
+		}
+
+	if ((memcmp(argv[argvPos],"--help",6)) == 0)
+        	{
+		printf("Usage %s [OPTION]... [FILE]\n", argv[0]);
+	        printf("Base64 encode FILE, or standard input, to standard output.\n");
+		printf("With no FILE, or when FILE is -, read standard input\n\n");
+		printf("Mandatory arguments to long options are mandatory for short options too.\n");
+		printf("  -d, --decode\t\tdecode data.\n");
+		printf("  -w, --wrap=COLS\twrap encoded lines after COLS character (default 76).\n");
+                printf("\t\t\t  Use 0 to disable line wrapping\n\n");
+		printf("This program is part of UNG.\n");
+		printf("Version: 0.1\n");
+		exit(0);
+		}
+	printf("%s: unrecognized option -- \'%s\'\n", argv[0], argv[argvPos]);//if here is reached, the option wasn't valid
+	exit(1);
+	}
+
+if ((memcmp(argv[argvPos],"-w",2)) == 0)
+	{
+	if (!argv[argvPos+1]){printf("%s: option requires an argument -- \'%c\'\n",argv[0],argv[argvPos][1]); exit(1);}//this triggers if -w hasn't been given a value
+	wrap = atoi(argv[++argvPos]);//overwrite the default wrap size with the new supplied one
+	if (!wrap){printf("%s: invalid wrap size: \'%s\'\n", argv[0], argv[argvPos]); exit(1);}
+	goto nextArgument;
+	}
+
+if ((memcmp(argv[argvPos],"-d",2)) == 0)
+	{
+	decode = true;
+	goto nextArgument;
+	}
+
+if (!argv[argvPos][1]){stdinMode(buffer, wrap, decode, argv[0]);}//if a '-' was detected, but the next char is NULL, '-' was inputted as a file, so stdinMode is activated
+printf("%s: invalid option -- \'%c\'\n", argv[0], argv[argvPos][1]);//if here is reached, the option wasn't valid
+exit(1);
+
+nextArgument: ++argvPos;//get read to process the next argument
+}
+
+if (!argv[argvPos]){stdinMode(buffer, wrap, decode, argv[0]);}//if no more operands were provided after options, go into stdin mode
+if (argv[argvPos+1]){printf("%s: extra operand \'%s\'\n", argv[0], argv[argvPos]); exit(1);}//if there are TWO and not ONE addittional argv arg's at this point, the operaterand to the left of the "FILE" is extra
+
+
+//file processing mode
+int result;
+int i = 0; //keeps track of buffer to write
+FILE *fp;
+struct stat sb;//struct used by stat()
+
+if (stat(argv[argvPos], &sb) == 0 && S_ISDIR(sb.st_mode)){fprintf(stderr, "%s: read error: Is a directory\n", argv[0]); free(buffer); exit(1);}//check if cli argv is a folder
+
+fp = fopen(argv[argvPos],"rb");//rb for reading binary
+if (!fp)//if file failed to open
+	{
+	if (errno == ENOENT){fprintf(stderr,"%s: %s: No such file or directory\n", argv[0], argv[argvPos]); free(buffer); exit(1);}//ENOENT is returned if there is no such file or directory
+	fprintf(stderr, "%s: %s: Could not open\n", argv[0], argv[argvPos]); free(buffer); exit(1);//all other errors are blanket handled
+	}
+
+result = fread(buffer+i, 1, sizeof(unsigned char)*DEFAULT_SIZE-1, fp);//attempt to read up to DEFAULT_SIZE from file. (-1 to account for NULL char to be added)
+if (!result){fclose(fp); free(buffer); exit(1);}//fread will fail if file is empty, so just exit.
+i+=result;//add result to i so chars in buffer aren't overwritten next fread()
+
+readAgain: if (result == (sizeof(unsigned char)*DEFAULT_SIZE-1))//if the file is longer than DEFAULT_SIZE, result will be the size of DEFAULT_SIZE
+		{
+		size += DEFAULT_SIZE;//increase size of buffer by DEFAULT_SIZE each time
+		buffer = realloc(buffer,size*sizeof(unsigned char));
+		if (!buffer){fprintf(stderr,"Realloc Failed!\n"); exit(1);}
+
+		result = fread(buffer+i, 1, sizeof(unsigned char)*DEFAULT_SIZE-1, fp);//attempt to read up to DEFAULT_SIZE from file
+	        if (!result){goto perfectSize;}//the previous fread() was the perfect size, so jump to processing
+		i+=result;//add result to i so chars in buffer aren't overwritten next fread()
+		goto readAgain;//repeat until result is less than DEFAULT_SIZE
+		}
+
+perfectSize: buffer[i] = '\0';//add null char since function expects it
+
+if (!decode)
+	{
+	char *output = base64Encode(buffer, i);
+	if (!output){fprintf(stderr, "Malloc Failed!\n"); exit(1);}
+	if (wrap == 0){result = fwrite(output, 1, sizeof(unsigned char)*strlen(output), stdout); goto exit;}//if wrap is set to 0, do no wrapping.
+
+	int charactersLeft = strlen(output);//the total number of characters to print is strlen(output_
+	int x = 0;//position to print from in string so wrap printing works
+
+	while (charactersLeft > wrap)//keep looping until all of the wrap length writes are done
+		{
+		result = fwrite(output+x, 1, sizeof(unsigned char)*wrap, stdout);//write wrap number of characters at a time
+		if (!result){fprintf(stderr, "Fwrite Failed!\n"); exit(1);}//fwrite to stdout should not fail. It's best to just exit if it does.
+		putchar('\n');//add a newline to finish off the wrapped line
+		x += wrap;//increase the printing position to the next position
+		charactersLeft -= wrap;//decrease charactersLeft by how many were printed
+		}
+
+	if (charactersLeft == 0){goto exit;}//if the printed number of characters was perfect, don't print an extra newline
+
+	result = fwrite(output+x, 1, sizeof(unsigned char)*charactersLeft, stdout);//print any remaining characters that are smaller in number than wrap.
+	if (!result){fprintf(stderr, "Fwrite Failed!\n"); exit(1);}//fwrite to stdout should not fail. It's best to just exit if it does.
+	putchar('\n');//add a newline to finish off the wrapped line
+	goto exit;
+	}
+
+if (decode)
+	{
+	int outputLength = base64Decode(buffer, i);
+	if (!outputLength){fprintf(stderr,"%s: invalid input\n", argv[0]); free(buffer); exit(1);}//base64 returns -1 if input string was invalid
+	result = fwrite(buffer, 1, sizeof(unsigned char)*outputLength, stdout);
+	goto exit;
+	}
+
+exit: fclose(fp);//close the file
+free(buffer);
+return 0;
+}
diff --git a/main.h b/main.h
new file mode 100644
index 0000000..3a4ddb6
--- /dev/null
+++ b/main.h
@@ -0,0 +1,13 @@
+#ifndef MAIN_H
+#define MAIN_H
+
+#include <stdbool.h>
+//function prototypes
+char *base64Encode(unsigned char *input, int size);
+int base64Decode(unsigned char *string, int size);
+void stdinMode(char *buffer, int wrap, bool decode, char argv[]);
+
+#define DEFAULT_SIZE 4096 //the default size to make the buffer for input
+#define WRAP_CHAR 76 //default wrapping is 76 characters
+
+#endif
diff --git a/stdin.c b/stdin.c
new file mode 100644
index 0000000..3d2c54a
--- /dev/null
+++ b/stdin.c
@@ -0,0 +1,65 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "main.h"
+
+void stdinMode(char *buffer, int wrap, bool decode, char argv[])
+{
+//wrap encoded lines after COLS character (default 76).
+int size = DEFAULT_SIZE-1;
+
+int i = 0;//position in string
+moreInput: while (i < size)
+	{
+	//yes, reading one byte at a time is slow; but you shouldn't be dumping a file into stdin anyway.
+	if (!(fread(buffer+i, 1, 1*sizeof(unsigned char), stdin))){goto process;}//Goes to process if EOF or if fread fails
+	++i;//increment i so preiously read char isn't overwritten.
+	}
+//realloc if input could have exceeded buffer
+size += DEFAULT_SIZE;
+buffer = realloc(buffer,size*sizeof(unsigned char));
+if (!buffer){fprintf(stderr,"Realloc Failed!\n"); exit(1);}
+goto moreInput;
+
+process:;
+buffer[i] = '\0';//add null char since function expects it
+
+int result;
+
+if (!decode)
+	{
+	char *output = base64Encode(buffer, i);
+	if (!output){fprintf(stderr, "Malloc Failed!\n"); exit(1);}
+	if (wrap == 0){result = fwrite(output, 1, sizeof(unsigned char)*strlen(output), stdout); goto leave;}//if wrap is set to 0, do no wrapping.
+
+	int charactersLeft = strlen(output);//the total number of characters to print is strlen(output_
+	int x = 0;//position to print from in string so wrap printing works
+
+	while (charactersLeft > wrap)//keep looping until all of the wrap length writes are done
+		{
+		result = fwrite(output+x, 1, sizeof(unsigned char)*wrap, stdout);//write wrap number of characters at a time
+		if (!result){fprintf(stderr, "Fwrite Failed!\n"); exit(1);}//fwrite to stdout should not fail. It's best to just exit if it does.
+		putchar('\n');//add a newline to finish off the wrapped line
+		x += wrap;//increase the printing position to the next position
+		charactersLeft -= wrap;//decrease charactersLeft by how many were printed
+		}
+
+	if (charactersLeft == 0){goto leave;}//if the printed number of characters was perfect, don't print an extra newline
+
+	result = fwrite(output+x, 1, sizeof(unsigned char)*charactersLeft, stdout);//print any remaining characters that are smaller in number than wrap.
+	if (!result){fprintf(stderr, "Fwrite Failed!\n"); exit(1);}//fwrite to stdout should not fail. It's best to just exit if it does.
+	putchar('\n');//add a newline to finish off the wrapped line
+	goto leave;
+	}
+
+if (decode)
+	{
+	int outputLength = base64Decode(buffer, i);
+	if (outputLength == -1){fprintf(stderr,"%s: invalid input\n", argv); free(buffer); exit(1);}//base64 returns -1 if input string was invalid
+	result = fwrite(buffer, 1, sizeof(unsigned char)*outputLength, stdout);
+	goto leave;
+	}
+
+leave: free(buffer);
+exit(0);
+}