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/*
* Copyright (c) 2017 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
*/
#include <config.h>
#include <parc/algol/parc_Object.h>
#include <parc/algol/parc_DisplayIndented.h>
#include <parc/algol/parc_Memory.h>
#include <parc/algol/parc_RandomAccessFile.h>
#include <stdio.h>
struct PARCRandomAccessFile {
char *fname;
FILE *fhandle;
};
static void
_parcRandomAccessFile_Finalize(PARCRandomAccessFile **instancePtr)
{
assertNotNull(instancePtr, "Parameter must be a non-null pointer to a PARCRandomAccessFile pointer.");
PARCRandomAccessFile *instance = *instancePtr;
if (instance->fhandle != NULL) {
fclose(instance->fhandle);
}
if (instance->fname != NULL) {
parcMemory_Deallocate(&instance->fname);
}
}
parcObject_ImplementAcquire(parcRandomAccessFile, PARCRandomAccessFile);
parcObject_ImplementRelease(parcRandomAccessFile, PARCRandomAccessFile);
parcObject_ExtendPARCObject(PARCRandomAccessFile, _parcRandomAccessFile_Finalize, NULL,
parcRandomAccessFile_ToString, parcRandomAccessFile_Equals, NULL,
parcRandomAccessFile_HashCode, parcRandomAccessFile_ToJSON);
void
parcRandomAccessFile_AssertValid(const PARCRandomAccessFile *instance)
{
assertTrue(parcRandomAccessFile_IsValid(instance),
"PARCRandomAccessFile is not valid.");
}
void
parcRandomAccessFile_Display(const PARCRandomAccessFile *instance, int indentation)
{
parcDisplayIndented_PrintLine(indentation, "PARCRandomAccessFile@%p {", instance);
parcDisplayIndented_PrintLine(indentation + 1, "File: %s", instance->fname);
parcDisplayIndented_PrintLine(indentation, "}");
}
PARCHashCode
parcRandomAccessFile_HashCode(const PARCRandomAccessFile *instance)
{
return parcHashCode_Hash((uint8_t *) instance->fname, strlen(instance->fname));
}
bool
parcRandomAccessFile_Equals(const PARCRandomAccessFile *x, const PARCRandomAccessFile *y)
{
bool result = false;
if (x == y) {
result = true;
} else if (x == NULL || y == NULL) {
result = false;
} else {
if (strcmp(x->fname, y->fname) == 0) {
result = true;
}
}
return result;
}
bool
parcRandomAccessFile_IsValid(const PARCRandomAccessFile *instance)
{
bool result = false;
if (instance != NULL) {
result = instance->fhandle != NULL;
}
return result;
}
PARCJSON *
parcRandomAccessFile_ToJSON(const PARCRandomAccessFile *instance)
{
PARCJSON *result = parcJSON_Create();
if (result != NULL) {
parcJSON_AddString(result, "fname", instance->fname);
}
return result;
}
char *
parcRandomAccessFile_ToString(const PARCRandomAccessFile *instance)
{
char *result = parcMemory_Format("PARCRandomAccessFile[%s]@%p\n", instance->fname, instance);
return result;
}
PARCRandomAccessFile *
parcRandomAccessFile_Open(PARCFile *file)
{
PARCRandomAccessFile *handle = parcObject_CreateAndClearInstance(PARCRandomAccessFile);
if (handle != NULL) {
char *fname = parcFile_ToString(file);
handle->fhandle = fopen(fname, "r+");
handle->fname = parcMemory_StringDuplicate(fname, strlen(fname));
parcMemory_Deallocate(&fname);
}
return handle;
}
bool
parcRandomAccessFile_Close(PARCRandomAccessFile *fileHandle)
{
assertNotNull(fileHandle->fhandle, "Can't fclose a null pointer. How did they get one anyway?");
bool result = fclose(fileHandle->fhandle) == 0;
fileHandle->fhandle = NULL;
parcMemory_Deallocate(&fileHandle->fname);
fileHandle->fname = NULL;
return result;
}
// read (count * size) bytes into the provided buffer, and return the number of bytes actually read
size_t
parcRandomAccessFile_Read(PARCRandomAccessFile *fileHandle, PARCBuffer *buffer)
{
size_t length = parcBuffer_Remaining(buffer);
size_t numBytes = fread(parcBuffer_Overlay(buffer, length), 1, length, fileHandle->fhandle);
return numBytes;
}
// write (count * size) bytes from `buffer` to the file, and return the number of bytes actually written
size_t
parcRandomAccessFile_Write(PARCRandomAccessFile *fileHandle, PARCBuffer *buffer)
{
size_t length = parcBuffer_Remaining(buffer);
size_t numBytes = fwrite(parcBuffer_Overlay(buffer, length), 1, length, fileHandle->fhandle);
return numBytes;
}
size_t
parcRandomAccessFile_Seek(PARCRandomAccessFile *fileHandle, long offset, PARCRandomAccessFilePosition position)
{
size_t result = 0;
switch (position) {
case PARCRandomAccessFilePosition_Start:
result = fseek(fileHandle->fhandle, offset, SEEK_SET); // beginning of the file
break;
case PARCRandomAccessFilePosition_Current:
result = fseek(fileHandle->fhandle, offset, SEEK_CUR); // current offset
break;
case PARCRandomAccessFilePosition_End:
result = fseek(fileHandle->fhandle, offset, SEEK_END); // end of the file
break;
default:
assertTrue(false, "Invalid position %d", position);
}
return result;
}
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