comment convertir ascii en hexdump & binaire en hexadécimal dans le module du noyau

Question

Je suis en train d'écrire un module de noyau, Module prend en charge la conversion de données ASCII en données Hexdump et binaires à Hexdump et l'imprimer par chat. sans utiliser utilitaire hexdump (partie de util-linux)

Merci d'avance.

Answer 1

Ce programme est pour convertir ascii hex:

*/ 
#include <stdio.h> 
#include <stdlib.h> 


void hexdump(unsigned char *buffer, unsigned long index, unsigned long width) 
{ 
    unsigned long i; 
    for (i=0;i<index;i++) 
    { 
    printf("%02x ",buffer[i]); 
    } 
    for (unsigned long spacer=index;spacer<width;spacer++) 
    printf(" "); 
    printf(": "); 
    for (i=0;i<index;i++) 
    { 
    if (buffer[i] < 32) printf("."); 
    else printf("%c",buffer[i]); 
    } 
    printf("\n"); 
} 


int hexdump_file(FILE *infile,unsigned long start, unsigned long stop, unsigned long width) 
    { 
    char ch; 
    unsigned long f_index=0; 
    unsigned long bb_index=0; 
    unsigned char *byte_buffer = malloc(width); 
    if (byte_buffer == NULL) 
    { 
    printf("Could not allocate memory for byte_buffer\n"); 
    return -1; 
    } 
    while (!feof(infile)) 
    { 
    ch = getc(infile); 
    if ((f_index >= start)&&(f_index <= stop)) 
    { 
    byte_buffer[bb_index] = ch; 
    bb_index++; 
    } 
    if (bb_index >= width) 
    { 
     hexdump(byte_buffer,bb_index,width); 
     bb_index=0; 
    } 
    f_index++; 
    } 
    if (bb_index) 
    hexdump(byte_buffer,bb_index,width); 
    fclose(infile); 
    free(byte_buffer); 
    return 0; 
} 


int main(int argc, char *argv[]) 
{ 
    if (argc != 5) 
    { 
    printf("Usage: hexdump <infile> <start> <end> <width>\n"); 
    return 0; 
    } 
    FILE *infile=fopen(argv[1],"rb"); 
    if (infile==(FILE *)NULL) 
    { 
    printf("Error opening input file %s\n",argv[1]); 
    return 0; 
    } 
    printf("Filename: \"%s\"\n", argv[1]); 
    printf("Start : %lu\n", atoi(argv[2])); 
    printf("End : %lu\n", atoi(argv[3])); 
    printf("Bytes per Line: %lu\n",atoi(argv[4])); 
    int result = hexdump_file(infile,atoi(argv[2]),atoi(argv[3]),atoi(argv[4])); 
    return 0; 
} 


Run output: 

$ hexdump hexdump.c 0 100 16 
Filename: "hexdump.c" 
Start : 0 
End : 100 
Bytes per Line: 16 
2f 2a 0d 0a 20 20 54 68 69 73 20 65 6e 74 72 79 : /*.. This entry 
20 63 6f 6e 74 61 69 6e 73 20 63 65 72 74 61 69 : contains certai 
6e 20 66 75 6e 63 74 69 6f 6e 61 6c 69 74 79 20 : n functionality 
74 68 65 20 6f 74 68 65 72 73 20 6d 61 79 20 6e : the others may n 
6f 74 2e 0d 0a 20 20 20 20 2a 20 54 68 65 20 73 : ot... * The s 
74 6f 70 2d 73 74 61 72 74 20 73 70 61 6e 20 64 : top-start span d 
6f 65 73 20 6e    : oes n 

Merci & Cordialement Satish.G