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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 <stdio.h>
#include <unistd.h>
#include <parc/assert/parc_Assert.h>
#include <parc/algol/parc_FileOutputStream.h>
#include <parc/algol/parc_Object.h>
PARCOutputStreamInterface *PARCFileOutputStreamAsPARCInputStream = &(PARCOutputStreamInterface) {
.Acquire = (PARCOutputStream * (*)(PARCOutputStream *))parcFileOutputStream_Acquire,
.Release = (void (*)(PARCOutputStream **))parcFileOutputStream_Release,
.Write = (size_t (*)(PARCOutputStream *, PARCBuffer *))parcFileOutputStream_Write
};
struct parc_file_output_stream {
int fd;
};
static void
_destroy(PARCFileOutputStream **streamPtr)
{
PARCFileOutputStream *stream = *streamPtr;
close(stream->fd);
}
parcObject_ExtendPARCObject(PARCFileOutputStream, _destroy, NULL, NULL, NULL, NULL, NULL, NULL);
PARCFileOutputStream *
parcFileOutputStream_Create(int fileDescriptor)
{
parcAssertTrue(fileDescriptor != -1, "Invalid file descriptor");
PARCFileOutputStream *result = parcObject_CreateInstance(PARCFileOutputStream);
result->fd = fileDescriptor;
return result;
}
PARCOutputStream *
parcFileOutputStream_AsOutputStream(PARCFileOutputStream *fileOutputStream)
{
return parcOutputStream_Create(parcFileOutputStream_Acquire(fileOutputStream), PARCFileOutputStreamAsPARCInputStream);
}
parcObject_ImplementAcquire(parcFileOutputStream, PARCFileOutputStream);
parcObject_ImplementRelease(parcFileOutputStream, PARCFileOutputStream);
bool
parcFileOutputStream_Write(PARCFileOutputStream *outputStream, PARCBuffer *buffer)
{
const size_t maximumChunkSize = 1024 * 1024;
while (parcBuffer_HasRemaining(buffer)) {
size_t remaining = parcBuffer_Remaining(buffer);
size_t chunkSize = remaining > maximumChunkSize ? maximumChunkSize : remaining;
void *buf = parcBuffer_Overlay(buffer, chunkSize);
ssize_t nwritten = write(outputStream->fd, buf, chunkSize);
if (nwritten == -1) {
break;
}
}
return parcBuffer_HasRemaining(buffer) == false;
}
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