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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 <fcntl.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <unistd.h>
#include <sys/stat.h>
#include <parc/assert/parc_Assert.h>
#include <parc/algol/parc_Memory.h>
#include <parc/algol/parc_File.h>
#include <parc/algol/parc_Buffer.h>
#include <parc/algol/parc_InputStream.h>
#include <parc/algol/parc_FileInputStream.h>
#include <parc/algol/parc_Object.h>
PARCInputStreamInterface *PARCFileInputStreamAsPARCInputStream = &(PARCInputStreamInterface) {
.Acquire = (PARCInputStream * (*)(const PARCInputStream *))parcFileInputStream_Acquire,
.Release = (void (*)(PARCInputStream **))parcFileInputStream_Release,
.Read = (size_t (*)(PARCInputStream *, PARCBuffer *))parcFileInputStream_Read
};
struct parc_file_input_stream {
int fd;
};
static void
_destroy(PARCFileInputStream **inputStreamPtr)
{
PARCFileInputStream *inputStream = *inputStreamPtr;
close(inputStream->fd);
}
parcObject_ExtendPARCObject(PARCFileInputStream, _destroy, NULL, NULL, NULL, NULL, NULL, NULL);
PARCFileInputStream *
parcFileInputStream_Open(const PARCFile *file)
{
PARCFileInputStream *result = NULL;
char *fileName = parcFile_ToString(file);
if (fileName != NULL) {
result = parcFileInputStream_Create(open(fileName, O_RDONLY));
parcMemory_Deallocate((void **) &fileName);
}
return result;
}
PARCFileInputStream *
parcFileInputStream_Create(int fileDescriptor)
{
parcTrapIllegalValueIf(fileDescriptor < 0, "File descriptor must not be negative.");
PARCFileInputStream *result = parcObject_CreateInstance(PARCFileInputStream);
if (result != NULL) {
result->fd = fileDescriptor;
}
return result;
}
parcObject_ImplementAcquire(parcFileInputStream, PARCFileInputStream);
parcObject_ImplementRelease(parcFileInputStream, PARCFileInputStream);
bool
parcFileInputStream_Read(PARCFileInputStream *inputStream, PARCBuffer *buffer)
{
while (parcBuffer_HasRemaining(buffer)) {
void *buf = parcBuffer_Overlay(buffer, 0);
ssize_t nread = read(inputStream->fd, buf, parcBuffer_Remaining(buffer));
if (nread < 0) {
break;
}
parcBuffer_SetPosition(buffer, parcBuffer_Position(buffer) + nread);
}
return parcBuffer_HasRemaining(buffer);
}
PARCBuffer *
parcFileInputStream_ReadFile(PARCFileInputStream *inputStream)
{
PARCBuffer *result = NULL;
struct stat statbuf;
if (fstat(inputStream->fd, &statbuf) == 0) {
result = parcBuffer_Allocate(statbuf.st_size);
if (result != NULL) {
parcFileInputStream_Read(inputStream, result);
}
}
return result;
}
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