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lab4 #210

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232 changes: 232 additions & 0 deletions lab4/main.c
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Original file line number Diff line number Diff line change
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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <locale.h>

typedef struct tag_header{
unsigned char id[3];
unsigned char version;
unsigned char subversion;
unsigned char flags;
unsigned char size[4];
} tag_header;

typedef struct frame_header{
unsigned char id[4];
unsigned char size[4];
unsigned char flags[2];
unsigned char a;
} frame_header;

int bytes_to_int(unsigned char *tmp){
return (int)(tmp[0] << 24 | tmp[1] << 16 | tmp[2] << 8 | tmp[3]);
}

int check_on_number_of_arguments(int argc)
{
if (argc < 3)
{
printf("Error, not enough arguments");
return -1;
}
else if (argc > 4)
{
printf("Error, too much arguments");
return -2;
}
else {
return 0;
}
}

char *get_argument(char *argv, char *arg){
arg = strtok(argv, "=");
arg = strtok(NULL, "=");
return arg;
}

void show(char *file_path){
FILE *file = fopen(file_path, "rb");
if(file == NULL){
printf("Error, cannot open the file\n");
return;
}
fseek(file, 0, SEEK_SET);
tag_header tag_header;

fread(&tag_header, 10 ,sizeof(char), file);
char header_id[3];
for(int i = 0; i < 3; i++){
header_id[i] = tag_header.id[i];
}
header_id[3] = '\0';
if(strcmp(header_id, "ID3") != 0){
printf("Error, not id3 format");
return;
}
unsigned int file_size = bytes_to_int(tag_header.size);

while(ftell(file) < file_size){
frame_header frame_header;
fread(&frame_header, 11, sizeof(char), file);
unsigned int frame_size = bytes_to_int(frame_header.size) - 1;
printf("%s ", frame_header.id);
char *frame_content = malloc((frame_size+1)*sizeof(char));
fread(frame_content, frame_size, sizeof(char), file);
frame_content[frame_size] = '\0';
printf("%s\n", frame_content);
free(frame_content);
}
}

void get(char *file_path, char *prop_name){
FILE *file = fopen(file_path, "rb");
if(file == NULL){
printf("Error, cannot open the file\n");
return;
}
fseek(file,0,SEEK_SET);
tag_header tag_header;
fread(&tag_header, 10, sizeof(char), file);
char header_id[3];
for(int i = 0; i < 3; i++){
header_id[i] = tag_header.id[i];
}
header_id[3] = '\0';
if(strcmp(header_id, "ID3") != 0){
printf("Error, not id3 format");
return;
}

unsigned int file_size = bytes_to_int(tag_header.size);

while(ftell(file) < file_size){
frame_header frame_header;
fread(&frame_header, 11, sizeof(char), file);
unsigned int frame_size = bytes_to_int(frame_header.size) - 1;
char frame_name[5];
for(int i = 0; i < 4; i++){
frame_name[i] = frame_header.id[i];
}
frame_name[5] = '\0';

char *frame_content = malloc((frame_size+1)*sizeof(char));
fread(frame_content, frame_size, sizeof(char), file);
frame_content[frame_size] = '\0';

if(strcmp(frame_name, prop_name) == 0){
printf("%s", frame_content);
}

free(frame_content);
}
}

void set(char *file_path, char *prop_name, char *prop_value){
FILE *file = fopen(file_path, "rb");
if(file == NULL){
printf("Error, cannot open the file\n");
return;
}
fseek(file,0,SEEK_SET);
tag_header tag_header;
fread(&tag_header, 10, sizeof(char), file);
char header_id[3];
for(int i = 0; i < 3; i++){
header_id[i] = tag_header.id[i];
}
header_id[3] = '\0';
if(strcmp(header_id, "ID3") != 0){
printf("Error, not id3 format");
return;
}

unsigned int file_size = bytes_to_int(tag_header.size);


}

int main(int argc, char **argv)
{
setlocale(LC_ALL, "Russian");

printf("hello \n");
char *file_path = NULL;
int show_flag = 0;
int get_flag = 0;
char *prop_name = NULL;
char *prop_value = NULL;
int set_flag = 0;


if(check_on_number_of_arguments(argc) != 0){
return - 1;
}

for(int i = 1; i < argc; i++){
if(strncmp("--filepath=", argv[i], 11) == 0){
file_path = get_argument(argv[i], file_path);
if(file_path == NULL){
printf("Error, wrong format\n");
return -1;
}
printf("%s\n", file_path);
}
else if(strncmp("--get=", argv[i], 6) == 0){
printf("get= ");
get_flag = 1;
prop_name = get_argument(argv[i], prop_name);
if(prop_name == NULL){
printf("Error, worng format\n");
return -1;
}
printf("%s\n", prop_name);
}
else if(strncmp("--show", argv[i], 6) == 0){
printf("show\n");
show_flag = 1;
}
else if(strncmp("--set=", argv[i], 6) == 0){
printf("set= ");
set_flag = 1;
prop_name = get_argument(argv[i], prop_name);
if(prop_name == NULL){
printf("Error, wrong format\n");
return -1;
}
printf("%s\n", prop_name);
i++;
if(i >= argc){
printf("Error, worng format\n");
return -1;
}
if(strncmp("--value=", argv[i], 8) == 0){
printf("value= ");
prop_value = get_argument(argv[i], prop_value);
if(prop_value == NULL){
printf("Error, wrong format\n");
return -1;
}
printf("%s\n", prop_value);
}
else{
printf("Error, wrong format\n");
return -1;
}
}
}

if(show_flag){
show(file_path);
return 0;
}
if(get_flag){
get(file_path, prop_name);
return 0;
}
if(set_flag){
set(file_path, prop_name, prop_value);
return 0;
}
return 0;
}