Initial commit

p1-check/p1-check.c

@@ -0,0 +1,60 @@
+/*
+ * CS 261 PA1: Mini-ELF header verifier
+ *
+ * Name: Nicholas Tamassia
+ */
+
+#include "p1-check.h"
+
+/**********************************************************************
+ *                         REQUIRED FUNCTIONS
+ *********************************************************************/
+
+bool read_header (FILE *file, elf_hdr_t *hdr)
+{
+    if (!file || !hdr) {
+        return false;
+    }
+
+    return ((fread(hdr, sizeof(elf_hdr_t), 1, file) == 1) && hdr->magic == 0x00464c45);
+}
+
+/**********************************************************************
+ *                         OPTIONAL FUNCTIONS
+ *********************************************************************/
+
+void dump_header (elf_hdr_t *hdr)
+{
+    uint8_t *byte_arr = (uint8_t*)hdr;
+    size_t size = sizeof(elf_hdr_t) / sizeof(byte_arr[0]);
+
+    for (int i = 0; i < size; i++) {
+        printf("%02x", byte_arr[i]);
+
+        if (i != size - 1) {
+            printf(" ");
+        }   
+
+        if (i == size / 2 - 1) {
+            printf(" ");
+        }
+    }
+    printf("\n");
+
+    printf("Mini-ELF version %d\n", hdr->e_version);
+    printf("Entry point 0x%03x\n", hdr->e_entry);
+    printf("There are %d program headers, starting at offset %d (0x%02x)\n", hdr->e_num_phdr, hdr->e_phdr_start, hdr->e_phdr_start);
+
+    if (hdr->e_symtab != 0) {
+        printf("There is a symbol table starting at offset %d (0x%02x)\n", hdr->e_symtab, hdr->e_symtab);
+    } else {
+        printf("There is no symbol table present\n");
+    }
+
+    if (hdr->e_strtab != 0) {
+        printf("There is a string table starting at offset %d (0x%02x)\n", hdr->e_strtab, hdr->e_strtab);
+    } else {
+        printf("There is no string table present\n");
+    }
+}
+