Skip to content

Commit 4c2cf38

Browse files
SommosSommos
authored
Merge pull request #10 from Sommos/main
Add (2) Converters, Modified UI
2 parents 899e9e6 + b6a5b0a commit 4c2cf38

File tree

3 files changed

+265
-47
lines changed

3 files changed

+265
-47
lines changed

‎src/converters/bmp_to_jpeg.c‎

Lines changed: 103 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,103 @@
1+
#include <stdio.h>
2+
#include <stdlib.h>
3+
#include <jpeglib.h>
4+
5+
int bmp_to_jpeg(const char *input_filename, const char *output_filename)
6+
{
7+
// open BMP file for reading
8+
FILE *input_file = fopen(input_filename, "rb");
9+
if (!input_file)
10+
{
11+
fprintf(stderr, "Error: could not open input file %s\n", input_filename);
12+
return 1;
13+
}
14+
// read BMP header
15+
unsigned char header[54];
16+
if (fread(header, sizeof(unsigned char), 54, input_file) != 54)
17+
{
18+
fprintf(stderr, "Error: invalid BMP file %s\n", input_filename);
19+
fclose(input_file);
20+
return 1;
21+
}
22+
// check if BMP file is valid
23+
if (header[0] != 'B' || header[1] != 'M')
24+
{
25+
fprintf(stderr, "Error: invalid BMP file %s\n", input_filename);
26+
fclose(input_file);
27+
return 1;
28+
}
29+
// get image width and height from BMP header
30+
int width = *(int *)&header[18];
31+
int height = *(int *)&header[22];
32+
// calculate padding for BMP file
33+
int padding = 0;
34+
while ((width * 3 + padding) % 4 != 0)
35+
{
36+
padding++;
37+
}
38+
// allocate memory for BMP image data
39+
unsigned char *bmp_data = (unsigned char *)malloc(width * height * 3 + height * padding);
40+
if (!bmp_data)
41+
{
42+
fprintf(stderr, "Error: could not allocate memory for BMP image data\n");
43+
fclose(input_file);
44+
return 1;
45+
}
46+
// read BMP image data
47+
if (fread(bmp_data, sizeof(unsigned char), width * height * 3 + height * padding, input_file) != width * height * 3 + height * padding)
48+
{
49+
fprintf(stderr, "Error: invalid BMP file %s\n", input_filename);
50+
free(bmp_data);
51+
fclose(input_file);
52+
return 1;
53+
}
54+
// close BMP file
55+
fclose(input_file);
56+
// allocate memory for JPEG image data
57+
unsigned char *jpeg_data = NULL;
58+
unsigned long jpeg_size = 0;
59+
// create JPEG compressor object
60+
struct jpeg_compress_struct cinfo;
61+
struct jpeg_error_mgr jerr;
62+
cinfo.err = jpeg_std_error(&jerr);
63+
jpeg_create_compress(&cinfo);
64+
// open output file for writing
65+
FILE *output_file = fopen(output_filename, "wb");
66+
if (!output_file)
67+
{
68+
fprintf(stderr, "Error: could not open output file %s\n", output_filename);
69+
free(bmp_data);
70+
jpeg_destroy_compress(&cinfo);
71+
return 1;
72+
}
73+
// set JPEG compressor parameters
74+
cinfo.image_width = width;
75+
cinfo.image_height = height;
76+
cinfo.input_components = 3;
77+
cinfo.in_color_space = JCS_RGB;
78+
jpeg_set_defaults(&cinfo);
79+
jpeg_set_quality(&cinfo, 75, TRUE);
80+
// set output file for JPEG compressor
81+
jpeg_stdio_dest(&cinfo, output_file);
82+
// start JPEG compressor
83+
jpeg_start_compress(&cinfo, TRUE);
84+
// write JPEG image data
85+
while (cinfo.next_scanline < cinfo.image_height)
86+
{
87+
JSAMPROW row_pointer = &bmp_data[(cinfo.image_height - cinfo.next_scanline - 1) * (width * 3 + padding)];
88+
jpeg_write_scanlines(&cinfo, &row_pointer, 1);
89+
}
90+
// finish JPEG compressor
91+
jpeg_finish_compress(&cinfo);
92+
// get size of JPEG image data
93+
jpeg_size = ftell(output_file);
94+
// close output file
95+
fclose(output_file);
96+
// destroy JPEG compressor object
97+
jpeg_destroy_compress(&cinfo);
98+
// free BMP image data
99+
free(bmp_data);
100+
printf("Converted %s to %s (%lu bytes)\n", input_filename, output_filename, jpeg_size);
101+
102+
return 0;
103+
}

‎src/converters/bmp_to_png.c‎

Lines changed: 115 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,115 @@
1+
#include <stdio.h>
2+
#include <stdlib.h>
3+
#include <png.h>
4+
5+
int bmp_to_png(const char *input_filename, const char *output_filename)
6+
{
7+
// open BMP file for reading
8+
FILE *input_file = fopen(input_filename, "rb");
9+
if (!input_file)
10+
{
11+
fprintf(stderr, "Error: could not open input file %s\n", input_filename);
12+
return 1;
13+
}
14+
// read BMP header
15+
unsigned char header[54];
16+
if (fread(header, sizeof(unsigned char), 54, input_file) != 54)
17+
{
18+
fprintf(stderr, "Error: invalid BMP file %s\n", input_filename);
19+
fclose(input_file);
20+
return 1;
21+
}
22+
// check if BMP file is valid
23+
if (header[0] != 'B' || header[1] != 'M')
24+
{
25+
fprintf(stderr, "Error: invalid BMP file %s\n", input_filename);
26+
fclose(input_file);
27+
return 1;
28+
}
29+
// get image width and height from BMP header
30+
int width = *(int *)&header[18];
31+
int height = *(int *)&header[22];
32+
// calculate padding for BMP file
33+
int padding = 0;
34+
while ((width * 3 + padding) % 4 != 0)
35+
{
36+
padding++;
37+
}
38+
// allocate memory for BMP image data
39+
unsigned char *bmp_data = (unsigned char *)malloc(width * height * 3 + height * padding);
40+
if (!bmp_data)
41+
{
42+
fprintf(stderr, "Error: could not allocate memory for BMP image data\n");
43+
fclose(input_file);
44+
return 1;
45+
}
46+
// read BMP image data
47+
if (fread(bmp_data, sizeof(unsigned char), width * height * 3 + height * padding, input_file) != width * height * 3 + height * padding)
48+
{
49+
fprintf(stderr, "Error: invalid BMP file %s\n", input_filename);
50+
free(bmp_data);
51+
fclose(input_file);
52+
return 1;
53+
}
54+
// close BMP file
55+
fclose(input_file);
56+
// open PNG file for writing
57+
FILE *output_file = fopen(output_filename, "wb");
58+
if (!output_file)
59+
{
60+
fprintf(stderr, "Error: could not open output file %s\n", output_filename);
61+
free(bmp_data);
62+
return 1;
63+
}
64+
// create PNG write struct
65+
png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
66+
if (!png_ptr)
67+
{
68+
fprintf(stderr, "Error: could not create PNG write struct\n");
69+
free(bmp_data);
70+
fclose(output_file);
71+
return 1;
72+
}
73+
// create PNG info struct
74+
png_infop info_ptr = png_create_info_struct(png_ptr);
75+
if (!info_ptr)
76+
{
77+
fprintf(stderr, "Error: could not create PNG info struct\n");
78+
free(bmp_data);
79+
png_destroy_write_struct(&png_ptr, NULL);
80+
fclose(output_file);
81+
return 1;
82+
}
83+
// set error handling
84+
if (setjmp(png_jmpbuf(png_ptr)))
85+
{
86+
fprintf(stderr, "Error: PNG error\n");
87+
free(bmp_data);
88+
png_destroy_write_struct(&png_ptr, &info_ptr);
89+
fclose(output_file);
90+
return 1;
91+
}
92+
// set PNG output file
93+
png_init_io(png_ptr, output_file);
94+
// set PNG header info
95+
png_set_IHDR(png_ptr, info_ptr, width, height, 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
96+
// write PNG header info
97+
png_write_info(png_ptr, info_ptr);
98+
// write PNG image data
99+
for (int y = 0; y < height; y++)
100+
{
101+
png_bytep row_pointer = &bmp_data[(height - y - 1) * (width * 3 + padding)];
102+
png_write_row(png_ptr, row_pointer);
103+
}
104+
// finish writing PNG file
105+
png_write_end(png_ptr, NULL);
106+
// free PNG write struct and info struct
107+
png_destroy_write_struct(&png_ptr, &info_ptr);
108+
// free BMP image data
109+
free(bmp_data);
110+
// close PNG file
111+
fclose(output_file);
112+
printf("Converted %s to %s\n", input_filename, output_filename);
113+
114+
return 0;
115+
}

0 commit comments

Comments
 (0)