Implemented function that correctly acquires TextureBatchDescriptors

include/devil1tex.h

@@ -38,12 +38,11 @@ struct TextureBatch {
 #pragma pack(pop)
 // re-enable stuct padding for whatever other reason.
 
-void gettph(struct TexturePack*, const char*);
-
 void printtph(struct TexturePack*);
 
-void gettbd(struct TextureBatchDescriptor*,
-            struct TexturePack *tph,
+void printtbd(struct TextureBatchDescriptor*);
+
+void gettbd(struct TextureBatchDescriptor**,
             const char*,
             unsigned int);
 

src/devil1tex.c

@@ -2,15 +2,6 @@
 #include <stdio.h>
 #include <string.h>
 
-// get texture pack header
-void gettph (struct TexturePack *tp, const char *filedata) {
-// Assume the Texture Pack Header is already allocated memory.
-    if (tp != NULL && filedata != NULL) {
-        memcpy(tp, filedata, sizeof(struct TexturePack));
-    }
-    return;
-}
-
 void printtph (struct TexturePack *tp) {
     if (tp != NULL) { 
         printf("id: \t %c %c %c %c \n", tp -> id[3], 
@@ -24,31 +15,43 @@ void printtph (struct TexturePack *tp) {
     return;
 }
 
+void printtbd(struct TextureBatchDescriptor *bd) {
+    if (bd != NULL) {
+        printf("batch index: \t %i \n", bd -> batchIdx);
+        printf("hash: \t %u \n",        bd -> hash);
+        printf("textures: \t %i\n",     bd -> texNumber);
+    }
+}
+
 // get texture pack descriptors
-void gettbd (struct TextureBatchDescriptor *tbd,
-               struct TexturePack* tph,
+void gettbd (struct TextureBatchDescriptor **descriptors,
              const char *filedata,
              unsigned int filesize) {
-    if (tbd == NULL || tph == NULL || filedata == NULL) {
-        // any of these being null will cause segmentation fault.
+    if (descriptors == NULL || filedata == NULL || filesize <= 0) {
         return;
     }
-    // do some checks regarding the header
-    if (tph -> firstBatchOffset >= filesize || 
-        tph -> firstBatchOffset <= 0) {
+    struct TexturePack *tp = NULL;
+    tp = (struct TexturePack*)filedata;
+    if (filesize <= (sizeof(struct TextureBatchDescriptor) 
+                    * tp -> batchNumber 
+                    + sizeof(struct TexturePack))){
+        fprintf(stderr, 
+                "File Error: file size to struct sizes ratio.\n");
         return;
     }
-    unsigned int index = tph -> firstBatchOffset;
+    unsigned int index = sizeof(struct TexturePack);
     // Batch Descriptors are structured one after another.
     // therefore the next one is at
     // current index + sizeof(TextureBatchDescriptor)
     unsigned int i = 0;
     do {
-        index += (sizeof(struct TextureBatchDescriptor) * i);
+        index = sizeof(struct TextureBatchDescriptor) * i 
+                + sizeof(struct TexturePack);
         printf("batch descriptor start: %x\n", index);
-        tbd = (struct TextureBatchDescriptor*)(filedata + index);
-        // <do something with the batch descriptor found>
-    } while(i < (tph -> batchNumber));
+        descriptors[i] = (struct TextureBatchDescriptor*)
+                            (filedata + index);
+        i++;
+    } while(i < (tp -> batchNumber));
     return;
 }
 

test/main.c

@@ -97,17 +97,21 @@ int main(int argc, char ** argv) {
     unsigned int bufsize = 0;
     char *buffer         = loadfile(f, &bufsize);
 //    unpackpld(buffer, bufsize, f);
-    struct TexturePack *tp = (struct TexturePack*)malloc
-                                (sizeof(struct TexturePack));
+    struct TexturePack *tp = NULL;
     printf("%d %d %d %d \n", buffer[0], 
                              buffer[1], 
                              buffer[2], 
                              buffer[3]);
-    gettph(tp, buffer);
-    printf("%x %x \n", buffer + 0, tp -> id[0]);
+    tp = (struct TexturePack*)buffer;
+    struct TextureBatchDescriptor **bds = NULL;
+    bds = (struct TextureBatchDescriptor**)malloc(tp -> batchNumber);
+    gettbd(bds, buffer, bufsize);
     printtph(tp);
-    
-    free(tp);
+    int i;
+    for (i = 0; i < tp -> batchNumber; i++) {
+        printtbd(bds[i]);
+    }
+    free(bds);
     free(buffer);
     return 0;
 }