cachelab started

cachelab/cbsl/src/flush.c

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+/*
+ * Copyright 2019 Yuta Hirokawa (University of Tsukuba, Japan)
+ *
+ * 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 <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+#include "./cbsl_internal.h"
+
+static
+cbsl_errors flush_serialize(cbsl_ctx* ctx)
+{
+	if (ctx->in_buffer_used > 0)
+	{
+		ZSTD_inBuffer input = { ctx->in_buffer, ctx->in_buffer_used, 0 };
+		ZSTD_EndDirective mode = (ctx->in_buffer_used < ctx->in_buffer_size) ? ZSTD_e_end : ZSTD_e_continue;
+		do
+		{
+			ZSTD_outBuffer output = { ctx->out_buffer, ctx->out_buffer_size, 0 };
+			const size_t remaining = ZSTD_compressStream2(ctx->zstd_cctx, &output, &input, mode);
+			CBSL_CHECK_COND_MSG_AND_RETURN(!ZSTD_isError(remaining), ZSTD_getErrorName(remaining), cbsl_error);
+
+			const size_t written = fwrite(ctx->out_buffer, 1, output.pos, ctx->fp);
+			CBSL_CHECK_COND_AND_RETURN(written == output.pos, cbsl_error);
+		} while (input.pos < input.size);
+
+		ctx->in_buffer_used = 0;
+	}
+
+	fflush(ctx->fp);
+
+	return cbsl_success;
+}
+
+cbsl_errors cbsl_flush(cbsl_ctx* ctx)
+{
+	CBSL_CHECK_COND_AND_RETURN(ctx != NULL, cbsl_error);
+	if (ctx->mode == cbsl_store_mode)
+	{
+		return flush_serialize(ctx);
+	}
+	return cbsl_success;
+}