REFACTOR: Completely remade the error handling format. Using pre-defined

error codes and error messages to make it easier to debug problems.

.clang-format

@@ -17,3 +17,4 @@ AllowShortIfStatementsOnASingleLine: AllIfsAndElse
 AllowShortLoopsOnASingleLine: true
 IndentAccessModifiers: false    # Indent access specifiers by one level
 AccessModifierOffset: -4       # Optional: adjust offset relative to the class indentation level
+# SpacesInBlockCommentsStyle: Always

include/image/imgio.h

@@ -19,7 +19,7 @@ void
 transcode_to_jpeg(PPM* in, JPEG* out);
 
 void
-transcode_to_ppm(JPEG* input, PPM* out);
+transcode_to_ppm(JPEG* in, PPM* out);
 
 PPM
 inherit_from_jpeg(const JPEG* in, const char fmt);

include/image/utils.h

@@ -21,6 +21,22 @@
 #define SHIFT_16 16 /**< Constant shift of 16-Bits */
 #define SHIFT_24 24 /**< Constant shift of 24-Bits */
 
+#define SUCCESS 0
+
+#define FAILURE 1
+#define ERR_BUF_NULL 20
+#define ERR_FILE_NULL 21
+#define ERR_INVALID_SIZE 22
+#define ERR_CREATION_FAIL 23
+#define ERR_IMG_NULL 24
+#define ERR_IMG_NAME_INVALID 25
+#define ERR_JHEADER 26
+
+extern const char* error_messages[];
+
+#define LOG(msg) printf("LOG: %s\n", msg)
+#define LOGERROR(error_code) printf("ERROR: %s\n", error_messages[error_code])
+
 /**
  *
  * @brief Max value for any channel

src/filters.c

@@ -3,6 +3,8 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#include "image/utils.h"
+
 unsigned int
 u32_put_alpha(const unsigned int clr, const unsigned char alpha)
 {
@@ -103,10 +105,10 @@ u32_mask(const unsigned int clr, const char keep)
 			return clr & (BYTE_A | BYTE_B);
 			break;
 		default:
-			return 0;
+			return FAILURE;
 			break;
 	}
-	return 0;
+	return FAILURE;
 }
 
 unsigned int
@@ -114,11 +116,8 @@ u32_rotl(const unsigned int clr, const int n)
 {
 	if (n > 8)
 	{
-		printf(
-		    "ERROR: %i is greater than 8 results in black "
-		    "pixels, please use values less than 8\n",
-		    n);
-		exit(10);
+		LOGERROR(ERR_INVALID_SIZE);
+		return ERR_INVALID_SIZE;
 	}
 	unsigned int red = DECODE_R(clr);
 	unsigned int green = DECODE_G(clr);
@@ -261,13 +260,15 @@ box_blur(const unsigned int* src_buf, const PPM* img, const int radius)
 	unsigned int* first_pass = malloc(img->len * sizeof(unsigned int));
 	if (!first_pass)
 	{
-		return 0;
+		LOGERROR(ERR_BUF_NULL);
+		return NULL;
 	}
 	unsigned int* dst_buf = malloc(img->len * sizeof(unsigned int));
 	if (!dst_buf)
 	{
 		free(first_pass);
-		return 0;
+		LOGERROR(ERR_BUF_NULL);
+		return NULL;
 	}
 	for (int y = 0; y < img->height; y++)
 	{

src/imgio.c

@@ -4,20 +4,21 @@
 #include <stdlib.h>
 #include <turbojpeg.h>
 
+#include "image/utils.h"
+
 unsigned int*
 ppm_load(const char* file, PPM* m_attr)
 {
-	printf("Starting decode...\n");
-	unsigned char red;
-	unsigned char green;
-	unsigned char blue;
+	LOG("Decoding");
+	unsigned char red, green, blue;
 	char fmt[3];
 	int max_val;
 	FILE* fptr;
 	fptr = fopen(file, "r");
 	if (!fptr)
 	{
-		printf("Invalid file name: %s\n", file);
+		LOGERROR(ERR_IMG_NAME_INVALID);
+		LOG(file);
 		return NULL;
 	}
 	fscanf(fptr, "%s", fmt);
@@ -29,12 +30,14 @@ ppm_load(const char* file, PPM* m_attr)
 	unsigned char* img_buf = malloc(m_attr->len * 3);
 	if (!img_buf)
 	{
+		LOGERROR(ERR_BUF_NULL);
 		return NULL;
 	}
 	unsigned int* clr_buf = malloc(m_attr->len * sizeof(unsigned int));
 	if (!clr_buf)
 	{
 		free(img_buf);
+		LOGERROR(ERR_BUF_NULL);
 		return NULL;
 	}
 	if (m_attr->fmt == '3')
@@ -60,7 +63,7 @@ ppm_load(const char* file, PPM* m_attr)
 
 	fclose(fptr);
 	free(img_buf);
-	printf("Decoding done!\n");
+	LOG("Decoding Finished");
 	return clr_buf;
 }
 
@@ -69,15 +72,16 @@ ppm_save(const unsigned int* buf, const PPM img, char* name)
 {
 	if (!buf)
 	{
-		return 10;
+		LOGERROR(ERR_BUF_NULL);
+		return ERR_BUF_NULL;
 	}
-	unsigned char red, green, blue;
 	unsigned char* dst_buf = malloc(img.len * 3);
 	if (!dst_buf)
 	{
-		return 10;
+		LOGERROR(ERR_BUF_NULL);
+		return ERR_BUF_NULL;
 	}
-	printf("Starting encode...\n");
+	LOG("Encoding");
 	FILE* fptr;
 
 	if (img.fmt == '3')
@@ -93,7 +97,8 @@ ppm_save(const unsigned int* buf, const PPM img, char* name)
 	if (!fptr)
 	{
 		free(dst_buf);
-		return 10;
+		LOGERROR(ERR_FILE_NULL);
+		return ERR_FILE_NULL;
 	}
 
 	fprintf(fptr, "P%c\n%d %d\n255\n", img.fmt, img.width, img.height);
@@ -101,10 +106,8 @@ ppm_save(const unsigned int* buf, const PPM img, char* name)
 	{
 		for (int i = 0; i < img.len; i++)
 		{
-			red = DECODE_R(buf[i]);
-			green = DECODE_G(buf[i]);
-			blue = DECODE_B(buf[i]);
-			fprintf(fptr, "%d %d %d ", red, green, blue);
+			fprintf(fptr, "%d %d %d ", DECODE_R(buf[i]),
+				DECODE_G(buf[i]), DECODE_B(buf[i]));
 			if (i % 7 == 0)
 			{
 				fprintf(fptr, "\n");
@@ -124,20 +127,20 @@ ppm_save(const unsigned int* buf, const PPM img, char* name)
 	}
 	fclose(fptr);
 	free(dst_buf);
-	printf("Encode Done!\n");
-	printf("Image: %s is saved.\n", name);
-	return 1;
+	LOG("Encoding Finished");
+	return SUCCESS;
 }
 
 unsigned int*
 jpeg_load(JPEG* m_attr)
 {
-	printf("Starting Decode...\n");
+	LOG("Decoding");
 	tjhandle tjdecompress = tj3Init(TJINIT_DECOMPRESS);
 	unsigned char* jpeg_buf = NULL;
 	FILE* infile = fopen(m_attr->name, "rb");
 	if (!infile)
 	{
+		LOGERROR(ERR_FILE_NULL);
 		return NULL;
 	}
 	fseek(infile, 0, SEEK_END);
@@ -148,26 +151,33 @@ jpeg_load(JPEG* m_attr)
 	fclose(infile);
 	if (tj3DecompressHeader(tjdecompress, jpeg_buf, m_attr->len) < 0)
 	{
-		printf("Header error: %s\n", tj3GetErrorStr(tjdecompress));
+		LOGERROR(ERR_JHEADER);
+		LOG(tj3GetErrorStr(tjdecompress));
 		free(jpeg_buf);
 		return NULL;
 	}
 	m_attr->width = tj3Get(tjdecompress, TJPARAM_JPEGWIDTH);
 	m_attr->height = tj3Get(tjdecompress, TJPARAM_JPEGHEIGHT);
+	m_attr->len = m_attr->width * m_attr->height;
 	unsigned int* pixels =
 	    malloc(m_attr->width * m_attr->height * sizeof(unsigned int));
+	if (!pixels)
+	{
+		LOGERROR(ERR_BUF_NULL);
+		return NULL;
+	}
 	tj3Decompress8(tjdecompress, jpeg_buf, m_attr->len,
 		       (unsigned char*)pixels, 0, TJPF_BGRA);
 	tj3Destroy(tjdecompress);
 	free(jpeg_buf);
-	printf("Decode Successful!\n");
+	LOG("Decoding Finished");
 	return pixels;
 }
 
 int
 jpeg_save(const unsigned int* src_buf, const JPEG* attr, const char* name)
 {
-	printf("Starting Decode...\n");
+	LOG("Encoding");
 	tjhandle tjcompress = tj3Init(TJINIT_COMPRESS);
 	unsigned char* dst_buf = NULL;
 	size_t dst_size = 0;
@@ -176,27 +186,52 @@ jpeg_save(const unsigned int* src_buf, const JPEG* attr, const char* name)
 	if (tj3Compress8(tjcompress, (unsigned char*)src_buf, attr->width, 0,
 			 attr->height, TJPF_BGRA, &dst_buf, &dst_size) < 0)
 	{
-		printf("TurboJPEG Error: %s\n", tj3GetErrorStr(tjcompress));
+		LOGERROR(ERR_JHEADER);
+		LOG(tj3GetErrorStr(tjcompress));
+		return ERR_JHEADER;
 	}
 	FILE* fptr = fopen(name, "wb");
-	if (!fptr || dst_buf == NULL || dst_size <= 0)
+	if (!fptr)
 	{
 		tj3Free(dst_buf);
-		return 25;
+		LOGERROR(ERR_FILE_NULL);
+		return ERR_FILE_NULL;
+	}
+	if (dst_buf == NULL)
+	{
+		tj3Free(dst_buf);
+		LOGERROR(ERR_BUF_NULL);
+		return ERR_BUF_NULL;
+	}
+	if (dst_size <= 0)
+	{
+		tj3Free(dst_buf);
+		LOGERROR(ERR_INVALID_SIZE);
+		return ERR_INVALID_SIZE;
 	}
 	fwrite(dst_buf, 1, dst_size, fptr);
 	fclose(fptr);
 
 	tj3Destroy(tjcompress);
 	tj3Free(dst_buf);
-	printf("Encode Successful!\n");
-	return 1;
+	LOG("Encoding Finished");
+	return SUCCESS;
 }
 
 void
 transcode_to_jpeg(PPM* in, JPEG* out)
 {
+	if (!in || !out)
+	{
+		LOGERROR(ERR_IMG_NULL);
+		return;
+	}
 	unsigned int* dst = ppm_load(in->name, in);
+	if (!dst)
+	{
+		LOGERROR(ERR_BUF_NULL);
+		return;
+	}
 	out->width = in->width;
 	out->height = in->height;
 	jpeg_save(dst, out, out->name);
@@ -204,11 +239,21 @@ transcode_to_jpeg(PPM* in, JPEG* out)
 }
 
 void
-transcode_to_ppm(JPEG* input, PPM* out)
+transcode_to_ppm(JPEG* in, PPM* out)
 {
-	unsigned int* dst = jpeg_load(input);
-	out->width = input->width;
-	out->height = input->height;
+	if (!in || !out)
+	{
+		LOGERROR(ERR_IMG_NULL);
+		return;
+	}
+	unsigned int* dst = jpeg_load(in);
+	if (!dst)
+	{
+		LOGERROR(ERR_BUF_NULL);
+		return;
+	}
+	out->width = in->width;
+	out->height = in->height;
 	out->len = out->width * out->height;
 	ppm_save(dst, *out, out->name);
 	free(dst);
@@ -217,6 +262,12 @@ transcode_to_ppm(JPEG* input, PPM* out)
 PPM
 inherit_from_jpeg(const JPEG* in, const char fmt)
 {
+	PPM img;
+	if (!in)
+	{
+		LOGERROR(ERR_IMG_NULL);
+		return img;
+	}
 	PPM image = { .name = in->name,
 		      .width = in->width,
 		      .height = in->height,
@@ -228,6 +279,12 @@ inherit_from_jpeg(const JPEG* in, const char fmt)
 JPEG
 inherit_from_ppm(const PPM* in)
 {
+	JPEG blank;
+	if (!in)
+	{
+		LOGERROR(ERR_IMG_NULL);
+		return blank;
+	}
 	JPEG image = {
 		.name = in->name,
 		.width = in->width,
@@ -236,11 +293,3 @@ inherit_from_ppm(const PPM* in)
 	};
 	return image;
 }
-
-/** The Second image gets merged into the first.
- * The First image obtains attributes from the second image that were not found.
- */
-// PPM
-// merge_ppm(const PPM* in_1, const PPM* in_2) {
-//         if(in)
-// }

src/main.c

@@ -12,7 +12,7 @@
  * Keep in mind any function that creates a new buffer and returns it can
  * overwrite the old one, however it is lost. SO create a new variable and free
  * the old one after use.
- * */
+ */
 int
 main()
 {
@@ -20,19 +20,46 @@ main()
 	// 	.name = "../MF8jno.jpg",
 	//
 	// };
+	// JPEG img_j = {
+	// 	.name = "../assets/test_2.jpg",
+	// };
+	//
+
+	// unsigned int* buffer = jpeg_load(&img_j);
+	// PPM out = inherit_from_jpeg(&img_j, '3');
+	// print_attr(&out);
+	//
+	// ppm_save(buffer, out, "../assets/test_2.ppm");
+	// free(buffer);
 	PPM img = {
-		.name = "../assets/test.ppm",
+		.name = "../assets/test_2.ppm",
 	};
 
+	// unsigned int* buf = ppm_load(img.name, &img);
+	// unsigned int* box = box_blur(buf, &img, 20);
+	// free(buf);
+	img.fmt = '3';
 	unsigned int* buf = ppm_load(img.name, &img);
+	if (!buf)
+	{
+		return ERR_BUF_NULL;
+	}
+	unsigned int* blur = box_blur(buf, &img, 20);
+	free(buf);
+	if (!blur)
+	{
+		return ERR_BUF_NULL;
+	}
 	for (int i = 0; i < img.len; i++)
 	{
-		// you need to replace the old value with the new updated value
-		buf[i] = u32_contrast(buf[i], 9);
+		blur[i] = u32_rotl(blur[i], 4);
 	}
-	img.fmt = '3';
-	// buf = u32_rotate(buf, &img);
-	ppm_save(buf, img, "../assets/test_new.ppm");
+	ppm_save(blur, img, "../assets/test_2_new.ppm");
+	free(blur);
+
+	// // buf = u32_rotate(buf, &img);
+	// ppm_save(box, img, "../assets/test_new.ppm");
+	// free(box);
 
 	// PPM out_2 = inherit_from_jpeg(&out_1, '6');
 	//

src/transformations.c

@@ -1,17 +1,22 @@
 #include "image/transformations.h"
 
+#include <stdio.h>
 #include <stdlib.h>
 
+#include "image/utils.h"
+
 unsigned int*
 ppm_flip_h(const unsigned int* buf, const PPM img)
 {
 	if (!buf)
 	{
+		LOGERROR(ERR_BUF_NULL);
 		return NULL;
 	}
 	unsigned int* flip = malloc(img.len * sizeof(unsigned int));
 	if (!flip)
 	{
+		LOGERROR(ERR_CREATION_FAIL);
 		return NULL;
 	}
 	int idx = 0;
@@ -33,11 +38,13 @@ ppm_flip_v(const unsigned int* buf, const PPM img)
 {
 	if (!buf)
 	{
+		LOGERROR(ERR_BUF_NULL);
 		return NULL;
 	}
 	unsigned int* flip = malloc(img.len * sizeof(unsigned int));
 	if (!flip)
 	{
+		LOGERROR(ERR_FILE_NULL);
 		return NULL;
 	}
 
@@ -58,13 +65,20 @@ ppm_flip_v(const unsigned int* buf, const PPM img)
 unsigned int*
 u32_rotate(const unsigned int* buf, PPM* m_img)
 {
-	if (!buf || !m_img)
+	if (!buf)
 	{
+		LOGERROR(ERR_BUF_NULL);
+		return NULL;
+	}
+	if (!m_img)
+	{
+		LOGERROR(ERR_IMG_NULL);
 		return NULL;
 	}
 	unsigned int* mask = malloc(m_img->len * sizeof(unsigned int));
 	if (!mask)
 	{
+		LOGERROR(ERR_BUF_NULL);
 		return NULL;
 	}
 	int old_width = m_img->width;

src/utils.c

@@ -1,6 +1,19 @@
 #include "image/utils.h"
+
 #include <stdio.h>
 
+const char* error_messages[] = {
+	[ERR_BUF_NULL] = "Buffer NULL",
+	[ERR_FILE_NULL] = "File NULL",
+	[ERR_CREATION_FAIL] = "Buffer creation failed",
+	[ERR_INVALID_SIZE] = "Given size is invalid",
+	[ERR_IMG_NULL] = "Image NULL",
+	[ERR_IMG_NAME_INVALID] = "Invalid File Name",
+	[ERR_JHEADER] = "Header Error:",
+
+#define ERR_JHEADER 26
+};
+
 unsigned long
 u32to_u64(const unsigned int clr)
 {
@@ -23,16 +36,16 @@ u64to_u32(const unsigned long clr, const unsigned long u64_div)
 			   (b / u64_div));
 }
 
-void
-__attribute__((overloadable))
-print_attr(const PPM *src) {
-        printf("Name: %s\nFMT: %c\nWidth: %i, Height: %i\nLength: %i\n",
-               src->name, src->fmt, src->width, src->height, src->len);
+void __attribute__((overloadable))
+print_attr(const PPM* src)
+{
+	printf("Name: %s\nFMT: %c\nWidth: %i, Height: %i\nLength: %i\n",
+	       src->name, src->fmt, src->width, src->height, src->len);
 }
 
-void
-__attribute__((overloadable))
-print_attr(const JPEG *src) {
-        printf("Name: %s\nWidth: %i, Height: %i\nLength: %i\n",
-               src->name, src->width, src->height, src->len);
+void __attribute__((overloadable))
+print_attr(const JPEG* src)
+{
+	printf("Name: %s\nWidth: %i, Height: %i\nLength: %i\n", src->name,
+	       src->width, src->height, src->len);
 }