95 lines
2.9 KiB
C
95 lines
2.9 KiB
C
#include "cdb_file-page.h"
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#include "../System Abstraction/cdb_sustem.h"
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struct fp_File_impl{
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sys_File file;
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unsigned long pageSize;
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};
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//Creates a new file, opens it, and resizes it to the specified page size
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fp_File fp_fileNew(char * fileName, unsigned long pageSize){ //there shouldn't be a page, longer than 4gb
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sys_File currentFile = sys_fileOpenInMem(fileName, SYS_FILE_NEW);
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if(currentFile == NULL){
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return NULL;
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}
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fp_File returnable = sys_heapAlloc(sizeof(struct fp_File_impl));
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returnable->pageSize = pageSize;
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returnable->file = currentFile;
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//The new File will be initialized with one memory Unit (Byte), so this code resizes it to the pageSize
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if(sys_fileResize(returnable->file, pageSize - 1) == NULL){
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sys_heapFree(returnable);
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return NULL;
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}
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return returnable;
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}
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fp_File fp_fileTemp(char * fileName, unsigned long pageSize){
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sys_File currentFile = sys_fileOpenInMem(fileName, SYS_FILE_TEMP);
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if(currentFile == NULL){
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return NULL;
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}
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fp_File returnable = sys_heapAlloc(sizeof(struct fp_File_impl));
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returnable->pageSize = pageSize;
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returnable->file = currentFile;
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//The new File will be initialized with one memory Unit (Byte), so this code resizes it to the pageSize
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if(sys_fileResize(returnable->file, pageSize - 1) == NULL){
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sys_heapFree(returnable);
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return NULL;
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}
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return returnable;
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}
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fp_File fp_fileOpen(char * fileName){
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sys_File currentFile = sys_fileOpenInMem(fileName, SYS_FILE_NOTHING);
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if(currentFile == NULL){
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return NULL;
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}
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fp_File returnable = sys_heapAlloc(sizeof(struct fp_File_impl));
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//returnable->pageSize = pageSize;
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returnable->file = currentFile;
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//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
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return returnable;
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}
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//Since someone else has to read the header, this function sets the read page size after fp_fileOpen has been called
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void fp_fileInit(fp_File file, unsigned long pageSize){
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file->pageSize = pageSize;
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}
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//negative values indicate the removable of the latest pages; so this library doesn't need more functions
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void * fp_fileAppendPages(fp_File file, long numberOfPages){
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void *newMem = sys_fileResize(file->file, file->pageSize * numberOfPages);
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if(newMem == NULL) {
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sys_fileClose(file->file);
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file->file = NULL;
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file->pageSize = 0;
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return NULL;
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}
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return newMem;
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}
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void * fp_fileToMemory(fp_File file){
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return sys_fileFileToMemory(file->file);
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}
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void fp_fileFlush(fp_File file) {
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sys_fileFlush(file->file);
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}
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void fp_fileClose(fp_File file){
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if(file->file != NULL) {
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sys_fileClose(file->file);
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}
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sys_heapFree(file);
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} |