diff --git a/main.c b/main.c
index 6dd2931..861da81 100644
--- a/main.c
+++ b/main.c
@@ -4,22 +4,33 @@
 #include <stdio.h>
 #include <string.h>
 
-void unpackpld(const char *buffer, struct PldHeader *pldh) {
-    unsigned int i     = 0;
+void unpackpld(const char *buffer, 
+               const struct PldHeader *ph, 
+               const char *name) {
     char *wbuffer      = NULL; // write buffer that will change.
     unsigned int wsize = 0;    // size of wbuffer.
-    for (i; (i + 1) < (pldh -> numOffset); i++) {
+    unsigned int i;
+    for (i = 0; (i + 1) < (ph -> numOffset); i++) {
         printf("start: %x - end: %x\n", 
-            pldh -> offsets[i], 
-            pldh -> offsets[i + 1]);
-/*         wsize   = offsets[i + 1] - offsets[i];
+            ph -> offsets[i], 
+            ph -> offsets[i + 1]);
+
+        // copy sector to write buffer
+        wsize   = (ph -> offsets[i + 1]) - (ph -> offsets[i]) + 1;
         wbuffer = (char*)malloc(sizeof(char) * wsize);
-        memcpy(wbuffer, buffer[offsets[i]], wsize); */
+        memcpy(wbuffer, buffer + (ph -> offsets[i]), wsize);
+        // create a file.
+        char *fn = (char*)malloc(sizeof(char)*strlen(name) + 4);
+        sprintf(fn, "%s_%d", name, i);
+        FILE *out  = fopen(fn, "w");
+        fputs(wbuffer, out);
+        fclose(out);
+        free(fn);
     }
     free(wbuffer);
 }
 
-void disp_pldheader(struct PldHeader *x) {
+void show_pldheader(struct PldHeader *x) {
     printf("number of offsets = %i\n", x -> numOffset);
     unsigned int i;
     for (i = 0; i < x -> numOffset; i++) {
@@ -27,70 +38,66 @@ void disp_pldheader(struct PldHeader *x) {
     }
 }
 
-bool read_pldheader(const char *buffer) {
+struct PldHeader *read_pldheader(const char *buffer) {
     if (buffer == NULL) {
-        return false;
+        return NULL;
     }
-    int32_t *n = (int32_t*)buffer;
+    int32_t *n                = (int32_t*)buffer;
     struct PldHeader *ph      = (struct PldHeader*)malloc(
         sizeof(struct PldHeader)
     );   
     uint32_t size_offsets = sizeof(uint32_t) * n[0];
-    ph -> offsets             = (uint32_t*)malloc(size_offsets);
+    ph -> offsets         = (uint32_t*)malloc(size_offsets);
     if (ph -> offsets == NULL) {
         perror("Error 4: ");
         free(ph);
         free(ph -> offsets);
-        return false;
+        return NULL;
     }
     // set data of struct.
     ph -> numOffset = n[0];
     memcpy(ph -> offsets, buffer + sizeof(int32_t), size_offsets);
-    disp_pldheader(ph);
-    unpackpld(buffer, ph);
-    free(ph -> offsets);
-    free(ph);
-    return true;
+    return ph;
 }
 
-bool readpld(const char *fname, char *buf) {
+char *readpld(const char *fname) {
     FILE *f           = fopen(fname, "rb");
     unsigned int size = 0; // number of elements to buffer;
     unsigned int rcnt = 0; // number of char's read by fread(...)
     if (f == NULL) {
         perror("Error 1: ");
-        return false;
+        return NULL;
     }
     // this method of determining file size doesn't work until 2 GB.
     fseek(f, 0, SEEK_END);
     size = ftell(f);
     rewind(f);
-    buf = (char*)malloc(sizeof(char) * size);
+    char *buf = (char*)malloc(sizeof(char) * size);
     if (buf == NULL) {
         perror("Error 2: ");
         free(buf);
-        return false;
+        return NULL;
     }
     rcnt = fread(buf, sizeof(char), size, f);
     if (rcnt < size) {
         perror("Error 3: ");
         free(buf);
-        return false;
+        return NULL;
     }
-    read_pldheader(buf);
     fclose(f);
-    return true;
+    return buf;
 }
 
 int main(int argc, char ** argv) {
     char *filename  = argv[1];
-    char *filedata    = NULL;
-    bool status     = readpld(filename, filedata);
-    if (status) {
-        printf("Read OK");
-    } else {
-        printf("Read not-OK");
+    char *filedata  = readpld(filename);
+    if (filedata != NULL) {
+        struct PldHeader *pldh = read_pldheader(filedata);
+        unpackpld(filedata, pldh, filename);
+        free(pldh -> offsets);
+        free(pldh);
     }
     free(filedata);
     return 0;
 }
+