xfarrow/dircomp
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Update dircomp.c

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This commit is contained in:
Alessandro Ferro 2023-04-14 09:53:56 +02:00
parent a92726f026
commit 3cc0dc6b9c
1 changed files with 37 additions and 13 deletions
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dircomp.c
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@ -13,6 +13,7 @@ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
#include <dirent.h>
#include <openssl/sha.h>
#include <string.h>
#include <limits.h>
struct arguments{
char* directory1;
@ -26,7 +27,8 @@ struct arguments{
struct arguments get_arguments(int, char**);
void print_help(void);
void print_files_in_directory(char*, char*, struct arguments*);
void analyze_directories(char*, char*, struct arguments*);
unsigned char* get_sha1_file(char *);
int main(int argc, char* argv[]){
struct arguments arguments = get_arguments(argc, argv);
@ -36,7 +38,7 @@ int main(int argc, char* argv[]){
return 0;
}
print_files_in_directory(arguments.directory1, "", &arguments); // pass pointer to reduce memory usage
analyze_directories(arguments.directory1, "", &arguments);
return 0;
}
@ -65,11 +67,11 @@ struct arguments get_arguments(int argc, char** argv){
}
// Get directories
if( (argc - optind) < 2){
if( (argc - optind) < 2 ){
fprintf (stderr, "Not enough directories.\n");
exit(-1);
}
else if( (argc - optind) > 2){
else if( (argc - optind) > 2 ){
fprintf (stderr, "Too many directories.\n");
exit(-1);
}
@ -85,7 +87,7 @@ struct arguments get_arguments(int argc, char** argv){
* References:
* https://www.gnu.org/software/libc/manual/html_node/Directory-Entries.html
*/
void print_files_in_directory(char* directory1, char* directory2, struct arguments* arguments){ // testing only
void analyze_directories(char* directory1, char* directory2, struct arguments* arguments){ // testing only
printf("\nAnalyzing directory %s\n", directory1);
DIR *d;
struct dirent *dir;
@ -104,7 +106,7 @@ void print_files_in_directory(char* directory1, char* directory2, struct argumen
if (dir -> d_type == DT_DIR)
{
if(arguments -> r == true)
print_files_in_directory(dir -> d_name, "", arguments);
analyze_directories(dir -> d_name, "", arguments);
}
}
@ -112,15 +114,37 @@ void print_files_in_directory(char* directory1, char* directory2, struct argumen
}
}
void sha1(char* string){
unsigned char hash[SHA_DIGEST_LENGTH];
SHA1(string, strlen(string), hash);
/*
* References:
* https://www.openssl.org/docs/man1.1.1/man3/SHA512_Init.html
*/
unsigned char* get_sha1_file(char *filename){
FILE* f = fopen(filename,"rb");
if(f == NULL){
fprintf (stderr, "Couldn't open %s\n", filename);
exit(-1);
}
int i;
for (i = 0; i < SHA_DIGEST_LENGTH; ++i)
printf("%02x", hash[i]);
// For a matter of efficiency, we do not read
// the whole file at once. It'd be heavy on RAM.
// Instead, we read BYTES_TO_READ_AT_ONCE at time
putchar('\n');
#define BYTES_TO_READ_AT_ONCE 1048576 // 1MiB
unsigned int bytes; // how many bytes we have actually read from fread
#if BYTES_TO_READ_AT_ONCE > UINT_MAX
#error Trying to read more bytes than what is possible to handle. Recompile using unsigned long or reduce BYTES_TO_READ_AT_ONCE
#endif
SHA_CTX context;
unsigned char* hash = malloc(SHA_DIGEST_LENGTH * sizeof(unsigned char)); // result will be here
unsigned char databuffer[BYTES_TO_READ_AT_ONCE];
SHA1_Init(&context);
while((bytes = fread(databuffer, 1, BYTES_TO_READ_AT_ONCE, f)) != 0){
SHA1_Update(&context, databuffer, bytes);
}
SHA1_Final(hash, &context);
fclose(f);
return hash;
}
void print_help(void){