From 2c14d03f8725c60b5ad8042bb9bb732d5e89e123 Mon Sep 17 00:00:00 2001
From: Jonas Gunz <himself@jonasgunz.de>
Date: Tue, 16 Apr 2019 17:43:20 +0200
Subject: Initial

---
 .gitignore |   4 +++
 Makefile   |  33 +++++++++++++++++
 src/main.c | 117 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 154 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 src/main.c

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..7dab7f3
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+obj/
+build/
+*.jpg
+*.strip
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..9c05b9a
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,33 @@
+
+CC      	= clang
+CLAGS  		= -Wall -g
+LDFLAGS 	=
+BUILDDIR 	= build
+SOURCEDIR 	= src
+OBJECTDIR 	= obj
+
+OUTPUT 		= headstripper
+
+SRCS = $(wildcard $(SOURCEDIR)/*.c)
+OBJS = $(SRCS:.c=.o)
+OBJ  = $(OBJS:$(SOURCEDIR)/%=$(OBJECTDIR)/%)
+
+build: dir $(OBJ)
+	@echo [LD] $(OBJ)
+	@$(CC) $(CFLAGS) -o $(BUILDDIR)/$(OUTPUT) $(OBJ) $(LDFLAGS)
+
+dir:
+	@mkdir -p $(OBJECTDIR)
+	@mkdir -p $(BUILDDIR)
+
+$(OBJECTDIR)/%.o: $(SOURCEDIR)/%.c
+	@echo [CC] $<
+	@$(CC) $(CFLAGS) -c $< -o $@
+
+.PHONY: clean
+
+clean:
+	@echo [RM] $(OBJ)
+	@echo [RM] $(BUILDDIR)/$(OUTPUT)
+	@rm -df  $(OBJ)
+	@rm -Rdf $(BUILDDIR) $(OBJECTDIR)
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..75186a9
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,117 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+
+
+//SWAPPED
+#define _MAGIC_JPG 0xD8FF //JPG Magic Value
+#define _MAGIC_BMP 0x4D42 //BMP Magic Value
+
+//JPG
+#define _JPG_EXIF 0xE1
+#define _JPG_COM  0xFE
+#define _JPG_COPY 0xEE
+
+#define _JPG_SOS  0xDA
+#define _JPG_EOI  0xD9
+
+void strip_jpg(char *_filename);
+
+int main(int argc, char* argv[])
+{
+	FILE *image;
+	uint16_t magic;
+
+	if(argc != 2)
+	{
+		printf("Wrong number of arguments!\nUsage: %s <Filename>\n", argv[0]);
+		exit(1);
+	}
+	
+	{
+		image = fopen(argv[1], "r");
+
+		if(!image)
+		{
+			printf("Unable to open %s\n", argv[1]);
+			exit(2);
+		}
+
+		fread(&magic, 2, 1, image);
+		fclose(image);
+	}
+
+	printf("Magic Value: %x\n", magic);
+	switch(magic)
+	{
+		case _MAGIC_JPG:
+			printf("Detected JPG\n");
+			strip_jpg(argv[1]);
+			break;
+		case _MAGIC_BMP:
+			printf("Detected BMP\nUnimplemented.\n");
+			break;
+	};
+
+	return 0;
+}
+
+void strip_jpg(char *_filename)
+{
+	FILE *in;
+	FILE *out;
+
+	int f__outfile_len = strlen(_filename);
+	char *f__outfile = malloc(f__outfile_len + 8);
+
+	strcpy( f__outfile, _filename);
+	strcpy(&f__outfile[f__outfile_len], ".strip\0");
+
+	in = fopen(_filename, "r");
+	out = fopen(f__outfile, "w");
+
+	//Feelin' lazy. Might add debug later, idk
+	if(!in)
+		exit(1);
+	if(!out)
+		exit(1);
+	
+	while(1)
+	{
+		unsigned char c = fgetc(in);
+		if(c == 0xFF)
+		{
+			unsigned char c2 = fgetc(in);
+			if( c2 == _JPG_EXIF || c2 == _JPG_COM || c2 == _JPG_COPY)
+			{
+				unsigned char c3 = fgetc(in);
+				unsigned char c4 = fgetc(in);
+				uint16_t seg_len = (( c3 << 8 ) & 0xff00) + c4;
+				for (uint16_t i = 0; i < seg_len; i++)
+				{
+					fgetc(in);
+				}	
+			}	
+			else if ( c2 == _JPG_EOI ) 
+			{
+				fputc(c, out);
+				fputc(c2, out);
+				break;
+			}
+			else
+			{
+				fputc(c, out);
+				fputc(c2, out);
+			}
+		}
+		else
+			fputc(c, out);
+		if(feof(in))
+			break;
+	}
+		
+	fclose(in);
+	fclose(out);
+	free(f__outfile);	
+}
-- 
cgit v1.2.3