The output uses human readable sizes

README.md

@@ -22,15 +22,45 @@ See INSTALL for more details.
 
 ----------
 
+###### USAGE EXAMPLES
+```
+$ caesiumclt -l -o ~/output/ ~/image.jpg
+```
+Losslessly compress ```image1.jpg```, located in the ```home``` directory, into a folder called ```output```
+
+```
+$ caesiumclt -q 80 -o ~/output/ ~/image.jpg
+```
+Compress ```image1.jpg```, located in the ```home``` directory, into a folder called ```output``` with lossy compression and quality set to 80
+
+```
+$ caesiumclt -l -e -o ~/output/ ~/image.jpg
+```
+Losslessly compress ```image1.jpg```, located in the ```home``` directory, into a folder called ```output``` and keeps EXIF metadata
+
+```
+$ caesiumclt -l -R -o ~/output/ ~/Pictures
+```
+Losslessly compress ```Pictures``` folder and subfolders, located in the ```home``` directory, into a folder called ```output```
+
+```
+$ caesiumclt -q 80 -s 50% -o ~/output/ ~/image1.jpg
+```
+Compress with quality 80 and resize at 50% ```image1.jpg```, located in the ```home``` directory, into a folder called ```output```
+
+----------
+
 ###### TODO
-* GIF support?
 * Code cleaning
+* Folder structure support
 
 ----------
 
 ###### CHANGELOG
 * 0.9.1-beta - Initial development stage
 
+Check the [Commits](https://github.com/Lymphatus/CaesiumCLT/commits/master) for a detailed list of changes.
+
 ----------
 
 ###### RESOURCES

src/compresshelper.c

@@ -120,8 +120,6 @@ int cclt_compress_routine(char* input, char* output, cclt_compress_parameters* p
 		cclt_jpeg_optimize(input, output, pars->exif_copy, input);
 	} else if (type == PNG) {
 		cclt_png_optimize(input, output);
-	} else if (type == GIF) {
-		printf("GIF detected. Not implemented yet.\n");
 	} else {
 		printf("Unknown file type.\n");
 		return -1;

src/main.c

@@ -76,6 +76,7 @@ void cclt_start(char** input_files, int n, char* output_folder, cclt_compress_pa
 	    //TODO Check symlinks too
 		if (isDirectory(input_files[i])) {
 	    	//Folder found, but we don't need it here
+	    	printf("Folder found\n");
 			i++;
 			continue;
 		}
@@ -103,8 +104,8 @@ void cclt_start(char** input_files, int n, char* output_folder, cclt_compress_pa
 		o_size = st_buf.st_size;
 		*(o_t_size) += o_size;
 
-		fprintf(stdout, "%ld bytes -> %ld bytes [%.2f%%]\n",
-			(long) i_size, (long) o_size, ((float) o_size - i_size) * 100 / i_size);
+		fprintf(stdout, "%s -> %s [%.2f%%]\n",
+			get_human_size(i_size), get_human_size(o_size), ((float) o_size - i_size) * 100 / i_size);
 
 		//TODO Provide complete progress support
 		i++;
@@ -171,8 +172,11 @@ int main (int argc, char *argv[]) {
 	//We need the file list right here
 	cclt_start(pars.input_files, pars.input_files_count, pars.output_folder, &pars, &i_t_size, &o_t_size);
 
-	fprintf(stdout, "-------------------------------\nCompression completed.\n%ld bytes -> %ld bytes [%.2f%% | %ld bytes]\n",
-		(long) i_t_size, (long) o_t_size, ((float) o_t_size - i_t_size) * 100 / i_t_size, (long) (o_t_size - i_t_size));
+	fprintf(stdout, "-------------------------------\nCompression completed.\n%s -> %s [%.2f%% | %s]\n",
+		get_human_size((long) i_t_size),
+		get_human_size((long) o_t_size),
+		((float) o_t_size - i_t_size) * 100 / i_t_size,
+		get_human_size(((long) o_t_size - i_t_size)));
 	
 	exit(0);
 }

src/utils.c

@@ -10,6 +10,7 @@
 #include <getopt.h>
 #include <ctype.h>
 #include <dirent.h>
+#include <math.h>
 
 #ifdef __linux
 	#include <linux/limits.h>
@@ -50,8 +51,8 @@ void print_help() {
 			"\t-o\tcompress to custom folder\n"
 			"\t-l\tuse lossless optimization\n"
 			"\t-s\tscale to value, expressed as percentage (e.g. 20%%) [Only 1/2^n allowed]\n"
-			//TODO Remove this warning
 			"\t-R\tif input is a folder, scan subfolders too\n"
+			//TODO Remove this warning
 			"\t-S\tkeep the folder structure [Not active yet]\n"
 			"\t-h\tdisplay this help and exit\n"
 			"\t-v\toutput version information and exit\n\n");
@@ -153,6 +154,7 @@ char** scan_folder(char* basedir, int* n, int recur) {
 }
 
 enum image_type detect_image_type(char* path) {
+	//Open the file
 	FILE* fp;
 	unsigned char* type_buffer = valloc(2);
 
@@ -162,14 +164,15 @@ enum image_type detect_image_type(char* path) {
 		fprintf(stderr, "Cannot open input file for type detection. Aborting.\n");
 		exit(-14);
 	}
-
+	//Read enough bytes
 	if (fread(type_buffer, 1, 2, fp) < 2) {
 		fprintf(stderr, "Cannot read file type. Aborting.\n");
 		exit(-15);
 	}
-
+	//We don't need it anymore
 	fclose(fp);
 
+	//Check the bytes against the JPEG and PNG specs
 	if (((int) type_buffer[0] == 0xFF) && ((int) type_buffer[1] == 0xD8)) {
 		free(type_buffer);
 		return JPEG;
@@ -186,3 +189,23 @@ int isDirectory(const char *file_path) {
 	stat(file_path, &s);
 	return S_ISDIR(s.st_mode);
 }
+
+char* get_human_size(long size) {
+	//We should not get more than TB images
+	char* unit[5] = {"B", "KB", "MB", "GB", "TB"};
+	//Index of the array containing the correct unit
+	double order = floor(log2(labs(size)) / 10);
+	//Alloc enough size for the final string
+	char* final = (char*) malloc(((int) (floor(log10(labs(size))) + 4)) * sizeof(char));
+
+	//If the order exceeds 4, something is fishy
+	if (order > 4) {
+		fprintf(stderr, "Do you really have such a huge file?\n");
+		order = 4;
+	}
+
+	//Copy the formatted string into the buffer
+	sprintf(final, "%.2f %s", size / (pow(1024, order)), unit[(int)order]);
+	//And return it
+	return final;
+}

src/utils.h

@@ -28,7 +28,6 @@ typedef struct cclt_compress_parameters {
 enum image_type {
 	JPEG,
 	PNG,
-	GIF,
 	UNKN,
 };
 
@@ -39,5 +38,6 @@ int mkpath(const char *pathname, mode_t mode);
 enum image_type detect_image_type(char* path);
 int isDirectory(const char *file_path);
 char** scan_folder(char* basedir, int* n, int recur);
+char* get_human_size(long size);
 
 #endif