i don't know what i'm doing anymore

1 files changed, 45 insertions, 0 deletions

diff --git a/lib/elf64.c b/lib/elf64.c
new file mode 100644
index 0000000..2dee395
--- /dev/null
+++ b/lib/elf64.c
@@ -0,0 +1,45 @@
+#include "elf.h"
+
+bool elf64_validate(Elf64_Ehdr *ehdr, unsigned type, unsigned machine)
+{
+    if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
+            ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
+            ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
+            ehdr->e_ident[EI_MAG3] != ELFMAG3 ||
+            ehdr->e_ident[EI_CLASS] != ELFCLASS64 ||
+            ehdr->e_ident[EI_DATA] != ELFDATA2LSB ||
+            ehdr->e_ident[EI_VERSION] != EV_CURRENT ||
+            ehdr->e_machine != machine ||
+            ehdr->e_type != type)
+    {
+        return false;
+    }
+
+    return true;
+}
+
+size_t elf64_size(Elf64_Ehdr *ehdr, Elf64_Phdr *phdrs)
+{
+    size_t size = 0;
+
+    for (int i = 0; i < ehdr->e_phnum; i++)
+    {
+        if (phdrs[i].p_type != PT_LOAD)
+        {
+            continue;
+        }
+
+        if (phdrs[i].p_offset + phdrs[i].p_memsz > size)
+        {
+            size = phdrs[i].p_offset + phdrs[i].p_memsz;
+            if (phdrs[i].p_align > 1)
+            {
+                size = (size + phdrs[i].p_align - 1) &
+                    ~(phdrs[i].p_align - 1);
+            }
+        }
+    }
+
+    return size;
+}
+