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Lab 4,5 #199

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208 changes: 208 additions & 0 deletions 4.c
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Original file line number Diff line number Diff line change
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#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include <stdbool.h>

char COMM [5]="COMM";
char TXXX [5]="TXXX";
struct Frame {
char frame_ID[4];
char size[4];
char flags[2];
};

struct MainHead {
char ID3[3];
char versionBytes[2];
char flagByte;
char size[4];
};

void setFrameSize(char* frameSize, int valSize) {
for (int i = 0; i < 4; i++) {
frameSize[i] = valSize / pow(2, 7 * (3 - i));
valSize -= frameSize[i] * pow(2, 7 * (3 - i));
}
}
bool equality(char* str1, char* str2) {
for (int i = 0; i < sizeof(str1); i++) {
if (str1[i] != str2[i]) {
return false;
}
}
return true;
}
int getFrameSize(char* byteArr) {
int size = 0;
unsigned char ch;
for (int i = 0; i < 4; i++) {
ch = byteArr[i];
size += ch * pow(2, 7 * (3 - i));
}
return size;
}

void showFrames(FILE* f) {
fseek(f, 0, SEEK_SET);
struct MainHead header;
fread(&header, sizeof(header), 1, f);
long long tagSize = getFrameSize(header.size);
struct Frame frame;
long long counter = 0;
while (counter <= tagSize) {
fread(&frame, sizeof(frame), 1, f);
long long frameSize = getFrameSize(frame.size);
counter += 10 + frameSize;
if (frame.frame_ID[0] == 'T') {
printf("%s ", frame.frame_ID);
while(frameSize--) {
char ch = fgetc(f);
if (ch >= 32 && ch <= 126)
printf("%c", ch);
}
printf("\n");
}
else if (equality(frame.frame_ID, COMM) == true) {
printf("%s ", frame.frame_ID);
fseek(f, 4, SEEK_CUR);
frameSize -= 4;
while(frameSize--) {
char ch = fgetc(f);
if (ch >= 32 && ch <= 126)
printf("%c", ch);
}
printf("\n");
}
}
}

void showFrame(FILE* f, char* frame_ID) {
fseek(f, 0, SEEK_SET);
struct MainHead header;
fread(&header, sizeof(header), 1, f);
int fileSize = getFrameSize(header.size);
struct Frame frame;
int counter = 0;
while (counter <= fileSize) {
fread(&frame, sizeof(frame), 1, f);
int frameSize = getFrameSize(frame.size);
counter += 10 + frameSize;
if (equality(frame.frame_ID, frame_ID) == true) {
printf("%s ", frame.frame_ID);
while(frameSize--) {
char ch = fgetc(f);
if (ch >= 32 && ch <= 126)
printf("%c", ch);
}
}
else {
fseek(f, getFrameSize(frame.size), SEEK_CUR);
}
}
}

void setVal(FILE* fin, FILE* fout, char* someFrame, char* val) {
fseek(fin, 0, SEEK_SET);
struct MainHead header;
fread(&header, sizeof(header), 1, fin);
fwrite(&header, sizeof(header), 1, fout);
int valSize = strlen(val);
int fileSize = getFrameSize(header.size);
struct Frame frame;
int counter = 0;
int frameSize = 0;
while (counter <= fileSize) {
fread(&frame, sizeof(frame), 1, fin);
frameSize = getFrameSize(frame.size);
counter += 10 + frameSize;
if (equality(frame.frame_ID, someFrame) == false && frameSize >= 0 && frameSize <= 100000) {
fwrite(&frame, 1, sizeof(frame), fout);
char info[frameSize];
fread(&info, frameSize, 1, fin);
fwrite(info, frameSize, 1, fout);
}
else if (equality(frame.frame_ID, someFrame) == true && frameSize >= 0){
int oldFrameSize = frameSize;
setFrameSize(header.size, getFrameSize(header.size) - frameSize + valSize);
int curPos = ftell(fout);
fseek(fout, 6, SEEK_SET);
fwrite(header.size, sizeof(header.size), 1, fout);
fseek(fout, curPos, SEEK_SET);
if (equality(frame.frame_ID, COMM) == true)
setFrameSize(frame.size, valSize + 4);
else if (equality(frame.frame_ID, TXXX) == true)
setFrameSize(frame.size, valSize + 2);
else
setFrameSize(frame.size, valSize);
int newFrameSize = getFrameSize(frame.size);
fwrite(&frame, sizeof(frame), 1, fout);
if (equality(frame.frame_ID, COMM) == true) {
for (int i = 0; i < 4; i++) {
fputc(fgetc(fin), fout);
}
fseek(fin, oldFrameSize - 4, SEEK_CUR);
}
else if (equality(frame.frame_ID, TXXX) == true) {
for (int i = 0; i < 2; i++) {
fputc(fgetc(fin), fout);
}
fseek(fin, oldFrameSize - 2, SEEK_CUR);
}
else
fseek(fin, oldFrameSize, SEEK_CUR);
fwrite(val, valSize, 1, fout);
}
}
int ch;
while ((ch = fgetc(fin)) != EOF) {
fputc(ch, fout);
}
fseek(fout, 0, SEEK_SET);
fseek(fin , 0, SEEK_SET);
while ((ch = getc(fout)) != EOF) {
fputc(ch, fin);
}
}



int main(int argc, char* argv[]) {
char com[3][20];
char arg[3][50];
int k = 0, m = 0, j = 0;

for (int i = 1; i < argc; i++) {
k = 0;
for (j = 0; argv[i][j] != '=' && argv[i][j] != '\0'; j++) {
com[m][k++] = argv[i][j];
}
com[m][k] = '\0';

j++;
k = 0;
while (argv[i][j] != '\0') {
arg[m][k++] = argv[i][j++];
}
arg[m][k] = '\0';
m++;
}

FILE* mp3;
mp3 = fopen(arg[0], "rb");
FILE* output;
output = fopen("out.mp3", "rb");
for (int i = 1; i < argc - 1; i++) {
if (strcmp(com[i], "--show") == 0) {
showFrames(mp3);
}
else if (strcmp(com[i], "--get") == 0) {
showFrame(mp3, arg[i]);
}
else if (strcmp(com[i], "--set") == 0) {
setVal(mp3, output, arg[i], arg[i + 1]);
}
}

return 0;
}
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