diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1bd85c4..79b3550 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,17 +7,20 @@ set(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
 
 # The version number.
 set(VERSION_MAJOR 0)
-set(VERSION_MINOR 2)
-set(VERSION_PATCH 2)
+set(VERSION_MINOR 3)
+set(VERSION_PATCH 0)
 
 configure_file(
         "caesium/config.h.in"
         "${PROJECT_BINARY_DIR}/config.h"
 )
 
+link_directories(/usr/local/lib)
+
 include_directories("${PROJECT_BINARY_DIR}")
 if (NOT WIN32)
     include_directories(/opt/mozjpeg/include)
+    include_directories(/usr/local/include)
 
     if(EXISTS /opt/mozjpeg/lib64)
         link_directories(/opt/mozjpeg/lib64)
diff --git a/README.md b/README.md
index 7ae933a..e07a0ca 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ Binaries not available yet. Please refer to the compilation section below.
 Libcaesium exposes one single function to compress, auto-detecting the input file type:
 ```C
 bool cs_compress(const char *input,
-                 const char *output,
+                 char *output,
                  cs_image_pars *options);
 ```
 #### Parameters
@@ -46,7 +46,7 @@ typedef struct cs_jpeg_pars
 The first 3 parameters matters, in term of compression, while the others will be set by the compressor/decompressor
 during the compression progress and thus they will be overwritten.
 - **quality**: in a range from 0 to 100, the quality of the resulting image. **Note** that 0 means _optimization_ (see below). Default: 0.
-- **exif_copy**: set it to _true_ to copy EXIF tag info after compression. Default: false;
+- **exif_copy**: set it to _true_ to copy EXIF tag info after compression. Default: false.
 - **dct_method**: one of the turbojpeg DCT flags. Default: TJFLAG_FASTDCT.
 
 ### PNG
diff --git a/caesium/CMakeLists.txt b/caesium/CMakeLists.txt
index 1cae1e4..59e14e8 100644
--- a/caesium/CMakeLists.txt
+++ b/caesium/CMakeLists.txt
@@ -4,7 +4,9 @@ else()
     set(CMAKE_C_FLAGS "--std=gnu99 ${CMAKE_C_FLAGS}")
 endif()
 
-find_library(zoflipng zopflipng /usr/local/lib)
+link_directories(/usr/local/lib)
+
+find_library(zopflipng zopflipng /usr/local/lib)
 find_library(jpeg jpeg /opt/mozjpeg/lib)
 find_library(turbojpeg turbojpeg /opt/mozjpeg/lib)
 
diff --git a/caesium/caesium.c b/caesium/caesium.c
index c69d4c1..9ce7f3b 100644
--- a/caesium/caesium.c
+++ b/caesium/caesium.c
@@ -25,11 +25,13 @@ bool cs_compress(const char *input_path, const char *output_path, cs_image_pars
 		display_error(WARNING, 103);
 	} else if (type == CS_JPEG) {
 		if (options->jpeg.quality != 0) {
-			cs_jpeg_compress(output_path, cs_jpeg_decompress(input_path, &options->jpeg), &options->jpeg);
+			result = cs_jpeg_compress(output_path, cs_jpeg_decompress(input_path, &options->jpeg), &options->jpeg);
 			//The output is now the new input for optimization
-			result = cs_jpeg_optimize(output_path, output_path, options->jpeg.exif_copy, input_path);
+			if (result) {
+				result = cs_jpeg_optimize(output_path, output_path, &options->jpeg, input_path);
+			}
 		} else {
-			result = cs_jpeg_optimize(input_path, output_path, options->jpeg.exif_copy, input_path);
+			result = cs_jpeg_optimize(input_path, output_path, &options->jpeg, input_path);
 		}
 	} else if (type == CS_PNG) {
 		result = cs_png_optimize(input_path, output_path, &options->png);
@@ -47,12 +49,12 @@ void initialize_jpeg_parameters(cs_image_pars *options)
 
 void initialize_png_parameters(cs_image_pars *par)
 {
-	par->png.iterations = 10;
-	par->png.iterations_large = 5;
-	par->png.block_split_strategy = 4;
+	par->png.iterations = 2;
+	par->png.iterations_large = 1;
+	par->png.block_split_strategy = 0;
 	par->png.lossy_8 = true;
 	par->png.transparent = true;
-	par->png.auto_filter_strategy = 1;
+	par->png.auto_filter_strategy = true;
 }
 
 cs_image_pars initialize_parameters()
diff --git a/caesium/caesium.h b/caesium/caesium.h
index cba71c1..86c710e 100644
--- a/caesium/caesium.h
+++ b/caesium/caesium.h
@@ -6,6 +6,7 @@ extern "C" {
 #endif
 
 #include <stdbool.h>
+#include <string.h>
 
 typedef struct cs_jpeg_pars
 {
diff --git a/caesium/error.c b/caesium/error.c
index 35b0683..96057b0 100644
--- a/caesium/error.c
+++ b/caesium/error.c
@@ -33,6 +33,14 @@ const char *get_error_message(int code)
 			return "Failed to open JPEG file while compressing";
 		case 204:
 			return "Failed to open JPEG file while decompressing";
+		case 205:
+			return "Failed to retrieve input JPEG file size";
+		case 206:
+			return "Input JPEG file is too big";
+		case 207:
+			return "Compressor failed";
+		case 208:
+			return "Compressor failed";
 
 			//PNG related errors
 		case 300:
diff --git a/caesium/jpeg.c b/caesium/jpeg.c
index 3d41356..b6147cf 100644
--- a/caesium/jpeg.c
+++ b/caesium/jpeg.c
@@ -2,6 +2,7 @@
 #include <jpeglib.h>
 #include <string.h>
 #include <turbojpeg.h>
+#include <limits.h>
 
 #include "jpeg.h"
 #include "error.h"
@@ -28,14 +29,14 @@ struct jpeg_decompress_struct cs_get_markers(const char *input)
 		jpeg_save_markers(&einfo, JPEG_APP0 + m, 0xFFFF);
 	}
 
-	jpeg_read_header(&einfo, TRUE);
+	jpeg_read_header(&einfo, true);
 
 	fclose(fp);
 
 	return einfo;
 }
 
-bool cs_jpeg_optimize(const char *input_file, const char *output_file, bool exif, const char *exif_src)
+bool cs_jpeg_optimize(const char *input_file, const char *output_file, cs_jpeg_pars *options, const char *exif_src)
 {
 	//File pointer for both input and output
 	FILE *fp;
@@ -66,14 +67,14 @@ bool cs_jpeg_optimize(const char *input_file, const char *output_file, bool exif
 	jpeg_stdio_src(&srcinfo, fp);
 
 	//Save EXIF info
-	if (exif) {
+	if (options->exif_copy) {
 		for (int m = 0; m < 16; m++) {
 			jpeg_save_markers(&srcinfo, JPEG_APP0 + m, 0xFFFF);
 		}
 	}
 
 	//Read the input headers
-	(void) jpeg_read_header(&srcinfo, TRUE);
+	(void) jpeg_read_header(&srcinfo, true);
 
 
 	//Read input coefficents
@@ -94,9 +95,7 @@ bool cs_jpeg_optimize(const char *input_file, const char *output_file, bool exif
 	}
 
 	//CRITICAL - This is the optimization step
-	dstinfo.optimize_coding = TRUE;
-	//Progressive
-	jpeg_simple_progression(&dstinfo);
+	dstinfo.optimize_coding = true;
 
 	//Set the output file parameters
 	jpeg_stdio_dest(&dstinfo, fp);
@@ -105,7 +104,7 @@ bool cs_jpeg_optimize(const char *input_file, const char *output_file, bool exif
 	jpeg_write_coefficients(&dstinfo, dst_coef_arrays);
 
 	//Write EXIF
-	if (exif) {
+	if (options->exif_copy) {
 		if (strcmp(input_file, exif_src) == 0) {
 			jcopy_markers_execute(&srcinfo, &dstinfo);
 		} else {
@@ -128,24 +127,23 @@ bool cs_jpeg_optimize(const char *input_file, const char *output_file, bool exif
 	return true;
 }
 
-void cs_jpeg_compress(const char *output_file, unsigned char *image_buffer, cs_jpeg_pars *options)
+bool cs_jpeg_compress(const char *output_file, unsigned char *image_buffer, cs_jpeg_pars *options)
 {
 	FILE *fp;
 	tjhandle tjCompressHandle;
 	unsigned char *output_buffer;
 	unsigned long output_size = 0;
-
+	output_buffer = NULL;
+	int result = 0;
 
 	//Check for errors
 	if ((fp = fopen(output_file, "wb")) == NULL) {
 		display_error(ERROR, 203);
 	}
 
-	output_buffer = NULL;
 	tjCompressHandle = tjInitCompress();
 
-	//TODO Error checks
-	tjCompress2(tjCompressHandle,
+	result = tjCompress2(tjCompressHandle,
 				image_buffer,
 				options->width,
 				0,
@@ -156,35 +154,45 @@ void cs_jpeg_compress(const char *output_file, unsigned char *image_buffer, cs_j
 				options->subsample,
 				options->quality,
 				options->dct_method);
-
-	fwrite(output_buffer, output_size, 1, fp);
+	if (result == -1) {
+		display_error(ERROR, 207);
+	} else {
+		fwrite(output_buffer, output_size, 1, fp);
+	}
 
 	fclose(fp);
 	tjDestroy(tjCompressHandle);
 	tjFree(output_buffer);
 	tjFree(image_buffer);
+
+	return true;
 }
 
 unsigned char *cs_jpeg_decompress(const char *fileName, cs_jpeg_pars *options)
 {
-	//TODO This has a lot of non checked errors that may occur
 	FILE *fp;
 	long sourceJpegBufferSize = 0;
 	unsigned char *sourceJpegBuffer = NULL;
 	tjhandle tjDecompressHandle;
-	int fileWidth = 0, fileHeight = 0, jpegSubsamp = 0, colorSpace = 0;
+	int fileWidth = 0, fileHeight = 0, jpegSubsamp = 0, colorSpace = 0, result = 0;
 
 	if ((fp = fopen(fileName, "rb")) == NULL) {
 		display_error(ERROR, 204);
 	}
 	fseek(fp, 0, SEEK_END);
 	sourceJpegBufferSize = ftell(fp);
-	sourceJpegBuffer = tjAlloc(sourceJpegBufferSize);
+	if (sourceJpegBufferSize == -1) {
+		display_error(ERROR, 205);
+	}
+	if (sourceJpegBufferSize > INT_MAX) {
+		display_error(ERROR, 206);
+	}
+	sourceJpegBuffer = tjAlloc((int) sourceJpegBufferSize);
 
 	fseek(fp, 0, SEEK_SET);
 	fread(sourceJpegBuffer, (size_t) sourceJpegBufferSize, 1, fp);
 	tjDecompressHandle = tjInitDecompress();
-	tjDecompressHeader3(tjDecompressHandle, sourceJpegBuffer, sourceJpegBufferSize, &fileWidth, &fileHeight,
+	tjDecompressHeader3(tjDecompressHandle, sourceJpegBuffer, (unsigned long) sourceJpegBufferSize, &fileWidth, &fileHeight,
 						&jpegSubsamp, &colorSpace);
 
 	options->width = fileWidth;
@@ -195,15 +203,18 @@ unsigned char *cs_jpeg_decompress(const char *fileName, cs_jpeg_pars *options)
 
 	unsigned char *temp = tjAlloc(options->width * options->height * tjPixelSize[options->color_space]);
 
-	tjDecompress2(tjDecompressHandle,
+	result = tjDecompress2(tjDecompressHandle,
 				  sourceJpegBuffer,
-				  sourceJpegBufferSize,
+				  (unsigned long) sourceJpegBufferSize,
 				  temp,
 				  options->width,
 				  0,
 				  options->height,
 				  options->color_space,
 				  options->dct_method);
+	if (result == -1) {
+		display_error(ERROR, 208);
+	}
 
 	tjDestroy(tjDecompressHandle);
 	tjFree(sourceJpegBuffer);
diff --git a/caesium/jpeg.h b/caesium/jpeg.h
index 2e77be5..2d7d97f 100644
--- a/caesium/jpeg.h
+++ b/caesium/jpeg.h
@@ -5,11 +5,11 @@
 
 #include "caesium.h"
 
-bool cs_jpeg_optimize(const char *input_file, const char *output_file, bool exif, const char *exif_src);
+bool cs_jpeg_optimize(const char *input_file, const char *output_file, cs_jpeg_pars *options, const char *exif_src);
 
 struct jpeg_decompress_struct cs_get_markers(const char *input);
 
-void cs_jpeg_compress(const char *output_file, unsigned char *image_buffer, cs_jpeg_pars *options);
+bool cs_jpeg_compress(const char *output_file, unsigned char *image_buffer, cs_jpeg_pars *options);
 
 unsigned char *cs_jpeg_decompress(const char *fileName, cs_jpeg_pars *options);
 
diff --git a/caesium/png.c b/caesium/png.c
index 32df8d5..c5a0e17 100644
--- a/caesium/png.c
+++ b/caesium/png.c
@@ -13,6 +13,7 @@ bool cs_png_optimize(const char *input, const char *output, cs_png_pars *options
 {
 	bool result = false;
 	CZopfliPNGOptions png_options;
+	int error_code = 0;
 
 	CZopfliPNGSetDefaults(&png_options);
 
@@ -32,7 +33,7 @@ bool cs_png_optimize(const char *input, const char *output, cs_png_pars *options
 	png_options.auto_filter_strategy = options->auto_filter_strategy;
 
 	if (lodepng_load_file(&orig_buffer, &orig_buffer_size, input) != 0) {
-		display_error(ERROR, 300);
+		error_code = 300;
 		goto cleanup;
 	}
 
@@ -42,12 +43,12 @@ bool cs_png_optimize(const char *input, const char *output, cs_png_pars *options
 						   0,
 						   &resultpng,
 						   &resultpng_size) != 0) {
-		display_error(ERROR, 301);
+		error_code = 301;
 		goto cleanup;
 	}
 
 	if (lodepng_save_file(resultpng, resultpng_size, output) != 0) {
-		display_error(ERROR, 302);
+		error_code = 302;
 		goto cleanup;
 	}
 
@@ -56,5 +57,8 @@ bool cs_png_optimize(const char *input, const char *output, cs_png_pars *options
 	cleanup:
 	free(orig_buffer);
 	free(resultpng);
+	if (error_code != 0) {
+		display_error(ERROR, error_code);
+	}
 	return result;
 }
diff --git a/demo/main.c b/demo/main.c
index 1cdf325..f9abacf 100644
--- a/demo/main.c
+++ b/demo/main.c
@@ -5,7 +5,7 @@
 
 int main(int argc, char *argv[])
 {
-	fprintf(stdout, "libcaesium demo application v%d.%d.%d\n\n",
+	fprintf(stdout, "libcaesium demo application v%d.%d.%d\n",
 		   VERSION_MAJOR,
 		   VERSION_MINOR,
 		   VERSION_PATCH);
@@ -16,7 +16,7 @@ int main(int argc, char *argv[])
 	}
 
 	cs_image_pars options = initialize_parameters();
-	cs_compress(argv[1], argv[2], &options);
+	bool result = cs_compress(argv[1], argv[2], &options);
 
-	exit(EXIT_SUCCESS);
+	exit(result);
 }
\ No newline at end of file
diff --git a/install.sh b/install.sh
index fe85865..7a6f533 100755
--- a/install.sh
+++ b/install.sh
@@ -11,7 +11,7 @@ mkdir build && cd build
 ../configure
 make && sudo make install
 
-cd $SOURCE
+cd ${SOURCE}
 
 #zopflipng
 git clone https://github.com/google/zopfli.git
@@ -23,4 +23,4 @@ sudo ln -s libzopflipng.so.1.0.0 /usr/lib/libzopflipng.so.1
 sudo mkdir /usr/include/zopflipng
 sudo cp src/zopflipng/zopflipng_lib.h /usr/include/zopflipng
 
-cd $SOURCE
+cd ${SOURCE}