From 674b575367c06052e9b4f522fa7aded9cdbe79fc Mon Sep 17 00:00:00 2001
From: =?utf8?q?Luk=C3=A1=C5=A1=20Ji=C5=99i=C5=A1t=C4=9B?=
 <gymnazium.jiriste@gmail.com>
Date: Sun, 28 Apr 2024 23:20:49 +0200
Subject: [PATCH] Implement the functionality

It is quite a small project so it has only taken a single commit.
---
 .gitignore  |   1 +
 .gitmodules |   3 ++
 Libft       |   1 +
 Makefile    |  54 +++++++++++++++++++
 README.txt  |   2 +-
 main.c      | 147 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 207 insertions(+), 1 deletion(-)
 create mode 100644 .gitmodules
 create mode 160000 Libft
 create mode 100644 Makefile
 create mode 100644 main.c

diff --git a/.gitignore b/.gitignore
index 6f71831..72027af 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+consebit
 *.[oa]
 tags
 *.pgm
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..626d139
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "Libft"]
+	path = Libft
+	url = git://ljiriste.work/Libft
diff --git a/Libft b/Libft
new file mode 160000
index 0000000..580d3d9
--- /dev/null
+++ b/Libft
@@ -0,0 +1 @@
+Subproject commit 580d3d9325f4105b5448a5f0e5503e6d105c6117
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..b1d22f8
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,54 @@
+CC := gcc
+CFLAGS = -std=c99 -Wall -Wextra -Werror -Wpedantic
+
+RM := rm -f
+
+EXT_LIBS := m
+EXT_LINKS := $(addprefix -l, $(EXT_LIBS))
+
+SUBPROJECTS := Libft
+
+INCDIR := .
+INCDIR += $(addsuffix /inc, $(SUBPROJECTS));
+INCLUDE := $(addprefix -I, $(INCDIR))
+
+SRCDIR := .
+
+SOURCES :=	main.c			\
+
+SOURCES := $(addprefix $(SRCDIR)/, $(SOURCES))
+
+OBJECTS := $(SOURCES:.c=.o)
+
+NAME := consebit
+
+all : $(NAME)
+
+debug : CFLAGS += -g
+debug : $(NAME)
+
+$(NAME) : $(OBJECTS) Libft/libft.a
+	$(CC) $(CFLAGS) -o $@ $^ $(EXT_LINKS)
+
+Libft/libft.a : | Libft/Makefile
+ifneq (,$(findstring debug, $(MAKECMDGOALS)))
+	$(MAKE) -C Libft debug
+else
+	$(MAKE) -C Libft
+endif
+
+%.o : %.c | Libft/Makefile
+	$(CC) $(CFLAGS) -o $@ -c $< $(INCLUDE)
+
+%/Makefile :
+	git submodule update --init $($@%/Makefile=%)
+
+clean :
+	$(RM) $(OBJECTS)
+
+fclean : clean
+	$(MAKE) -C Libft/ fclean
+	$(RM) $(NAME)
+
+re : fclean
+	$(MAKE) all
diff --git a/README.txt b/README.txt
index b659ecf..3affb04 100644
--- a/README.txt
+++ b/README.txt
@@ -11,5 +11,5 @@ who in turn found the concept in the video
 by Adrian Crenshaw
 https://www.youtube.com/watch?v=4bM3Gut1hIk
 
-The program should be quite simple to use, I imagine something like
+The program is quite simple to use
 ./consebit <file_name> [<output_file_name>]
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..c3df925
--- /dev/null
+++ b/main.c
@@ -0,0 +1,147 @@
+#include "libft.h"
+#include <errno.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <math.h>
+
+#define BUFFER_SIZE 100
+
+static const char	*default_out = "default.pgm";
+static const mode_t	mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
+
+int	open_files(int argc, char **argv, int *in_fd, int *out_fd)
+{
+	char		*line;
+
+	if (argc == 3)
+		*out_fd = open(argv[2], O_WRONLY | O_CREAT | O_EXCL, mode);
+	else
+		*out_fd = open(default_out, O_WRONLY | O_CREAT, mode);
+	while (*out_fd < 0 && errno == EEXIST)
+	{
+		ft_printf("The file %s already exist. Do you want to overwrite? (y or [n]) ", argv[2]);
+		line = get_next_line(STDIN_FILENO);
+		if (!ft_strcmp(line, "\n") || !ft_strcmp(line, "n\n"))
+		{
+			free(line);
+			return (1);
+		}
+		else if (!ft_strcmp(line, "y\n"))
+		{
+			*out_fd = open(argv[2], O_WRONLY | O_CREAT, mode);
+			free(line);
+			if (*out_fd < 0)
+				return (2);
+		}
+	}
+	*in_fd = open(argv[1], O_RDONLY);
+	if (*in_fd >= 0)
+		return (0);
+	close(*out_fd);
+	return (2);
+}
+
+void	print_pgm_header(int fd)
+{
+	ft_dprintf(fd, "P5\n256 256\n255\n");
+	return ;
+}
+
+int	mat_max(t_mat *mat)
+{
+	size_t	i;
+	size_t	j;
+	int		tmp;
+	int		max;
+
+	i = 0;
+	max = 0;
+	while (i < 256)
+	{
+		j = 0;
+		while (j < 256)
+		{
+			tmp = *(int *)ft_mat_access(mat, i, j);
+			if (tmp > max)
+				max = tmp;
+			++j;
+		}
+		++i;
+	}
+	return (max);
+}
+
+void	print_image(int fd, t_mat *mat)
+{
+	size_t		i;
+	size_t		j;
+	int			cell;
+	const int	max = mat_max(mat);
+
+	i = 0;
+	while (i < 256)
+	{
+		j = 0;
+		while (j < 256)
+		{
+			cell = *(int *)ft_mat_access(mat, i, j);
+			ft_dprintf(fd, "%c", (char)(log(cell + 1) / log(max + 1) * 255));
+			++j;
+		}
+		++i;
+	}
+	return ;
+}
+
+void	file_processing(int in_fd, int out_fd)
+{
+	size_t			i;
+	unsigned char	buffer[BUFFER_SIZE];
+	t_mat			matrix;
+
+	if (ft_mat_init(&matrix, sizeof(int)) != success || ft_mat_zeros(&matrix, 256, 256) != success)
+		return ;
+	while (read(in_fd, buffer, BUFFER_SIZE) > 0)
+	{
+		i = 1;
+		while (i < BUFFER_SIZE)
+		{
+			++*(int *)ft_mat_access(&matrix, buffer[i - 1], buffer[i]);
+			++i;
+		}
+	}
+	print_pgm_header(out_fd);
+	print_image(out_fd, &matrix);
+	ft_mat_free(&matrix, NULL);
+	return ;
+}
+
+void	print_help(void)
+{
+	ft_printf("This is the consebit tool by Lukáš Jiřiště\n"
+			"This tool plots frequency of pairs of consecutive bits.\n\n"
+			"consebit <input_file> [<output_file>]\n");
+	return ;
+}
+
+int	main(int argc, char **argv)
+{
+	int	in_fd;
+	int	out_fd;
+	int	res;
+
+	if (argc < 2 || argc > 3)
+	{
+		print_help();
+		return (1);
+	}
+	res = open_files(argc, argv, &in_fd, &out_fd);
+	if (res != 0)
+		return (res);
+	file_processing(in_fd, out_fd);
+	close(in_fd);
+	close(out_fd);
+	return (0);
+}
-- 
2.30.2