lab6

lab6/Source.c

@@ -0,0 +1,122 @@
+#include <stdio.h>
+#include <string.h>
+#include <malloc.h>
+
+union FSize 
+{
+    unsigned char Bytes[4];
+    unsigned int SizeOfFile;
+} FSize;
+
+void Create(int argc, char* argv[], char* ArchName) 
+{
+    FILE* Arch = fopen(ArchName, "wb");
+    FILE* F;
+
+    for (int i = 5; i < argc; i++) 
+    {
+        F = fopen(argv[i], "rb");
+
+        fseek(F, 0, SEEK_END);
+
+        unsigned int FileSize = ftell(F);
+
+        fseek(F, 0, SEEK_SET);
+
+        unsigned char NameLen = strlen(argv[i]) + 1;
+
+        fputc(NameLen, Arch);
+
+        FSize.SizeOfFile = FileSize;
+
+        for (int j = 3; j >= 0; j--)
+            fputc(FSize.Bytes[j], Arch);
+
+        fwrite(argv[i], sizeof(unsigned char), NameLen, Arch);
+
+        unsigned char* Buff = calloc(FileSize, sizeof(unsigned char));
+
+        fread(Buff, sizeof(unsigned char), FileSize, F);
+        fwrite(Buff, sizeof(unsigned char), FileSize, Arch);
+
+        free(Buff);
+        fclose(F);
+    }
+
+    printf("%s created\n", ArchName);
+
+    fclose(Arch);
+}
+
+void Extract(char* ArchName) {
+    FILE* Arch = fopen(ArchName, "rb");
+    int NameLen;
+
+    while ((NameLen = fgetc(Arch)) != -1) 
+    {
+        char FileLen[4];
+        fread(FileLen, sizeof(unsigned char), 4, Arch);
+
+        for (int j = 3; j >= 0; j--)
+            FSize.Bytes[j] = FileLen[3-j];
+
+        unsigned char* FName = calloc(NameLen, sizeof(unsigned char));
+        for (unsigned char i = 0; i < NameLen; i++) {
+            FName[i] = fgetc(Arch);
+        }
+
+        FILE* F = fopen(FName, "wb");
+
+        unsigned char* Buff = calloc(sizeof(unsigned char), FSize.SizeOfFile);
+
+        fread(Buff, sizeof(unsigned char), FSize.SizeOfFile, Arch);
+        fwrite(Buff, sizeof(unsigned char), FSize.SizeOfFile, F);
+
+        printf("%s exctracted\n", FName);
+
+        free(FName);
+        free(Buff);
+        fclose(F);
+    }
+
+    fclose(Arch);
+}
+
+void List(char* ArchName) 
+{
+    FILE* Arch = fopen(ArchName, "rb");
+    unsigned int NameLen;
+
+    while ((NameLen = getc(Arch)) != EOF) 
+    {
+        char FileLen[4];
+        fread(FileLen, sizeof(unsigned char), 4, Arch);
+
+        for (int j = 3; j >= 0; j--)
+            FSize.Bytes[j] = FileLen[3 - j];
+
+        unsigned char* FName = calloc(NameLen, sizeof(unsigned char));
+
+        fread(FName, sizeof(unsigned char), NameLen, Arch);
+
+        fseek(Arch, FSize.SizeOfFile, SEEK_CUR);
+
+        printf("%s\n", FName);
+        free(FName);
+    }
+    fclose(Arch);
+}
+
+int main(int argc, char* argv[]) 
+{
+    char* ArchName = argv[3];
+
+    if (strcmp(argv[4], "--create") == 0)
+        Create(argc, argv, ArchName);
+    else if (strcmp(argv[4], "--extract") == 0)
+        Extract(ArchName);
+    else if (strcmp(argv[4], "--list") == 0)
+        List(ArchName);
+
+    return 0;
+}