pzpKBpet

1#include <stdio.h>
2#include <malloc.h>
3
4unsigned int xorshift32(unsigned int seed) {
5
6    unsigned int r = seed;
7
8    r = r ^ r << 13;
9    r = r ^ r >> 17;
10    r = r ^ r << 5;
11
12    return r;
13
14}
15
16void XorShiftArrayConstruct(unsigned int **XSArray, int dimXSArray, unsigned int *seed) {
17
18    int i;
19
20    *XSArray = (unsigned int) malloc(dimXSArray * sizeof(unsigned int));
21
22    for (i = 0; i < dimXSArray; i++) {
23        XSArray[i] = xorshift32(*seed);
24        *seed = XSArray[i];
25    }
26}
27
28unsigned char *CitireLiniarizare(char *bmpIn) {
29
30
31    FILE *fin;
32    unsigned int dim_img, latime_img, inaltime_img;
33    unsigned char pRGB[3], header[54], aux;
34
35    fin = fopen(bmpIn, "rb");
36
37    if (fin == NULL) {
38        printf("nu am gasit imaginea sursa din care citesc");
39        return 0;
40    }
41
42    //citesc dimensiunile de la octetul 18 respectiv 22
43    fseek(fin, 18, SEEK_SET);
44    fread(&latime_img, sizeof(unsigned int), 1, fin);
45    fread(&inaltime_img, sizeof(unsigned int), 1, fin);
46    printf("Dimensiunea imaginii in pixeli (latime x inaltime): %u x %u\n", latime_img, inaltime_img);
47
48
49
50    unsigned char *liniarizare;//creez vectorul pentru liniarizarea matricei
51    unsigned char k = 0;//k reprezinta contorul pozitiilor din vectorul liniarizare
52
53    liniarizare = (unsigned char *) malloc((3 * inaltime_img * latime_img) * sizeof(unsigned char));
54
55
56    /*for (k = 0; k < 54; k++)
57        fread(&liniarizare[k], 1, 1, fin);//adaug headerul in vectorul liniarizare*/
58
59    fseek(fin, 54, SEEK_SET);
60    //creez o matrice temporara de care sa ma ajut pentru a liniariza
61    unsigned char **temp;
62    temp = (unsigned char **) malloc(inaltime_img * sizeof(unsigned char *));
63
64    int i, j;
65    for (i = 0; i < inaltime_img; i++) {
66        *(temp + i) = (unsigned char *) malloc((3 * latime_img) * sizeof(unsigned char));
67        for (j = 0; j < 3 * latime_img; j++) {
68
69            fread(&temp[i][j], 1, 1, fin);
70
71        }
72    }
73
74
75    for (i = inaltime_img - 1; i >= 0; i--)
76        for (j = 0; j < 3 * latime_img; j++)
77            liniarizare[k++] = temp[i][j];
78
79
80    //eliberam memoria matricei temporare
81    for (i = 0; i < inaltime_img; i++) {
82        free(temp[i]);
83    }
84    free(temp);
85    fclose(fin);
86    return liniarizare;
87}
88
89
90int main() {
91    char bmpIn[] = "peppers.bmp";
92    char secretKey[] = "secret_key.txt";
93
94
95    FILE *fin_secret_key = fopen(secretKey, "r");
96    if (fin_secret_key == NULL) {
97        printf("Fisierul secret_key.txt nu a putut fi deschis");
98    }
99    unsigned int seed = fscanf(fin_secret_key, "%u", &seed);
100
101
102    unsigned int dimXSArray = 4, *XSArray;//todo vezi ca trebuie schimbata dimensiunea vectorulu XS
103    XorShiftArrayConstruct(&XSArray, dimXSArray, &seed);
104
105    int latime_img,inaltime_img;
106    unsigned char *new;
107
108    FILE *fin;
109    fin = fopen(bmpIn, "rb");
110
111    if (fin == NULL) {
112        printf("nu am gasit imaginea sursa din care citesc");
113        return 0;
114    }
115
116    //citesc dimensiunile de la octetul 18 respectiv 22
117    fseek(fin, 18, SEEK_SET);
118    fread(&latime_img, sizeof(unsigned int), 1, fin);
119    fread(&inaltime_img, sizeof(unsigned int), 1, fin);
120    printf("Dimensiunea imaginii in pixeli (latime x inaltime): %u x %u\n", latime_img, inaltime_img);
121    rewind(fin);
122    new=CitireLiniarizare(bmpIn);
123
124    FILE *fout=fopen("enc_peppers1.bmp","wb");
125    int i;
126    unsigned char x;
127    for(i=0;i<54;i++)
128    fwrite()    
129    fwrite(new,1,latime_img*inaltime_img*3+54,fout);
130}