diff --git a/include/devil1pld.h b/include/devil1pld.h
index 93a006d..d57bfd7 100644
--- a/include/devil1pld.h
+++ b/include/devil1pld.h
@@ -17,6 +17,10 @@ struct PldHeader {
 // * = pass by reference of a struct PldHeader
 bool getpldh(struct PldHeader*, const char*);
 
+// input: pointer to header, index of offset, filesize
+// * = pass by reference of a struct PldHeader
+int sizeofpldstruct(struct PldHeader*, unsigned int, unsigned int);
+
 // input: a pld header struct.
 // * = pass by reference of a struct PldHeader
 void printpldh(struct PldHeader*);
diff --git a/src/devil1pld.c b/src/devil1pld.c
index 1f55484..bc0e378 100644
--- a/src/devil1pld.c
+++ b/src/devil1pld.c
@@ -11,6 +11,24 @@ bool getpldh(struct PldHeader *ph, const char *filedata) {
     return good;
 }
 
+// determine the size of the i-th pld structure
+int sizeofpldstruct(struct PldHeader *ph, unsigned int i, unsigned int max) {
+    unsigned int size = -1;
+    if (ph == NULL) {
+        fprintf(stderr, "Error: given null pointer\n");
+        return size;
+    }
+    if (i > ph -> numOffset) {
+        fprintf(stderr, "Error: i exceeds pldHeader -> numOffset\n");
+        return size;
+    }
+    unsigned int start = 0, end = 0;
+    start = ph -> offsets[i];
+    end   = (i == (ph -> numOffset) - 1) ? max : ph -> offsets[i + 1];
+    size  = end - start;
+    return size;
+}
+
 void printpldh(struct PldHeader *ph) {
     if (ph == NULL) {
         return;
diff --git a/test/main.c b/test/main.c
index c92f3ba..6617ba4 100644
--- a/test/main.c
+++ b/test/main.c
@@ -96,7 +96,12 @@ bool unpackpld(const char *filedata,
     struct PldHeader h;
     if (filedata != NULL && filesize > 0) {
         getpldh(&h, filedata);
-        printpldh(&h);
+    }
+    int size = 0;
+    unsigned int i = 0;
+    for (i = 0; i < h.numOffset; i++) {
+        size = sizeofpldstruct(&h, i, filesize);
+        printf("%x\n", size);
     }
 }
 
@@ -152,8 +157,8 @@ int main(int argc, char ** argv) {
     char *f = argv[1];
     unsigned int bufsize = 0;
     char *buffer         = loadfile(f, &bufsize);
-//    unpackpld(buffer, bufsize, f);
-    exporttextures(buffer, bufsize, f);
+    unpackpld(buffer, bufsize, f);
+//    exporttextures(buffer, bufsize, f);
     free(buffer);
     return 0;
 }