[Add] Pack features woo!! (list files).

src/pack.c

@@ -297,3 +297,43 @@ int pack_close(Packfile* file) {
   return (i) ? -1 : 0;
 }
 
+// Load the filenames int the packfile to filenames.
+// filenames should be freed after use
+// On error if filenames is (char**)-1.
+#define READ(f,b,n) if(read(f,b,n)!=n) { ERR("Too few bytes read. Expected more."); return; }
+void pack_listfiles(const char* packfile, char** filenames, uint32_t* nfiles) {
+  int fd, j;
+  uint32_t i;
+  char* buf = malloc(sizeof(magic));
+
+  *nfiles = 0;
+  filenames = malloc(sizeof(char*));
+  filenames = (char**)-1;
+
+  fd = open(packfile, O_RDONLY);
+  if(fd == -1) {
+    ERR("opening %s: %s", packfile, strerror(errno));
+    return;
+  }
+  READ(fd, buf, sizeof(magic)); // Make sure it is a packfile.
+  if(memcpy(buf, &magic, sizeof(magic))) {
+    ERR("File %s is not a valid packfile", packfile);
+    return;
+  }
+  free(buf);
+
+  READ(fd, &nfiles, 4);
+  filenames = realloc(filenames,(*nfiles+1)*sizeof(char*));
+  for(i = 0; i < *nfiles; i++) {
+    // Start searching files.
+    j = 0;
+    filenames[i] = malloc(MAX_FILENAME * sizeof(char));
+    READ(fd, &filenames[i][j], 1); // Get the name.
+    while(filenames[i][j++] != '\0')
+      READ(fd, &filenames[i][j], 1);
+  }
+  filenames[i] == NULL;
+  close(fd);
+}
+#undef READ
+

src/pack.h

@@ -19,4 +19,5 @@ int pack_close(Packfile* file);
 
 // Fancy stuff.
 void* pack_readfile(const char* packfile, const char* filename, uint32_t* filesize);
+void pack_listfiles(const char* packfile, char** filenames, uint32_t* nfiles);