needs testing

File-Page Abstraction/cdb_file-page.c

@@ -0,0 +1,79 @@
+#include "cdb_file-page.h"
+#include "../System Abstraction/cdb_sustem.h"
+
+struct fp_File_impl{
+    sus_File file;
+    unsigned long pageSize;
+};
+
+//Creates a new file, opens it, and resizes it to the specified page size
+fp_File fp_fileNew(char * fileName, unsigned long pageSize){ //there shouldn't be a page, longer than 4gb
+    sus_File currentFile = sus_fileOpenInMem(fileName, SUS_FILE_NEW);
+    if(currentFile == NULL){
+        return NULL;
+    }
+
+    struct fp_File_impl * returnable = sus_heapAlloc(sizeof(struct fp_File_impl));
+    returnable->pageSize = pageSize;
+    returnable->file = currentFile;
+
+    //The new File will be initialized with one memory Unit (Byte), so this code resizes it to the pageSize
+    if(sus_fileResize(returnable->file, pageSize - 1) == NULL){
+        sus_heapFree(returnable);
+        return NULL;
+    }
+
+    return returnable;
+}
+
+fp_File fp_fileTemp(char * fileName, unsigned long pageSize){
+    sus_File currentFile = sus_fileOpenInMem(fileName, SUS_FILE_TEMP);
+    if(currentFile == NULL){
+        return NULL;
+    }
+
+    struct fp_File_impl * returnable = sus_heapAlloc(sizeof(struct fp_File_impl));
+    returnable->pageSize = pageSize;
+    returnable->file = currentFile;
+
+    //The new File will be initialized with one memory Unit (Byte), so this code resizes it to the pageSize
+    if(sus_fileResize(returnable->file, pageSize - 1) == NULL){
+        sus_heapFree(returnable);
+        return NULL;
+    }
+
+    return returnable;
+}
+fp_File fp_fileOpen(char * fileName){
+    sus_File currentFile = sus_fileOpenInMem(fileName, SUS_FILE_NOTHING);
+    if(currentFile == NULL){
+        return NULL;
+    }
+
+    struct fp_File_impl * returnable = sus_heapAlloc(sizeof(struct fp_File_impl));
+    //returnable->pageSize = pageSize;
+    returnable->file = currentFile;
+
+    //since this function does not read the header, there is no way of knowing, what the page size is. Somebody else has to call the fp_fileInit function for this
+
+    return returnable;
+}
+
+//Since someone else has to read the header, this function sets the read page size after fp_fileOpen has been called
+void fp_fileInit(fp_File file, unsigned long pageSize){
+    file->pageSize = pageSize;
+}
+
+//negative values indicate the removable of the latest pages; so this library doesn't need more functions
+void * fp_fileAppendPages(fp_File file, long numberOfPages){
+    sus_fileResize(file->file, file->pageSize * numberOfPages);
+}
+
+void * fp_fileToMemroy(fp_File file){
+    return sus_fileFileToMemroy(file->file);
+}
+
+void fp_fileClose(fp_File file){
+    sus_fileClose(file->file);
+    sus_heapFree(file);
+}

File-Page Abstraction/cdb_file-page.h

@@ -0,0 +1,16 @@
+typedef struct fp_File_impl * fp_File;
+
+//Creates a new file, opens it, and resizes it to the specified page size
+fp_File fp_fileNew(char * fileName, unsigned long pageSize); //there shouldn't be a page, longer than 4gb
+fp_File fp_fileTemp(char * fileName, unsigned long pageSize);
+fp_File fp_fileOpen(char * fileName);
+
+//Since someone else has to read the header, this function sets the read page size after fp_fileOpen has been called
+void fp_fileSetPageSize(fp_File file, unsigned long pageSize);
+
+//negative values indicate the removable of the latest pages; so this library doesn't need more functions
+void * fp_fileAppendPages(fp_File file, long numberOfPages);
+
+void * fp_fileToMemroy(fp_File file);
+
+void fp_fileClose(fp_File file);