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-rw-r--r--src/core/lib/surface/byte_buffer_reader.c123
1 files changed, 123 insertions, 0 deletions
diff --git a/src/core/lib/surface/byte_buffer_reader.c b/src/core/lib/surface/byte_buffer_reader.c
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+++ b/src/core/lib/surface/byte_buffer_reader.c
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+/*
+ *
+ * Copyright 2015-2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <grpc/byte_buffer_reader.h>
+#include <string.h>
+
+#include <grpc/byte_buffer.h>
+#include <grpc/compression.h>
+#include <grpc/grpc.h>
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/slice_buffer.h>
+
+#include "src/core/lib/compression/message_compress.h"
+
+static int is_compressed(grpc_byte_buffer *buffer) {
+ switch (buffer->type) {
+ case GRPC_BB_RAW:
+ if (buffer->data.raw.compression == GRPC_COMPRESS_NONE) {
+ return 0 /* GPR_FALSE */;
+ }
+ break;
+ }
+ return 1 /* GPR_TRUE */;
+}
+
+void grpc_byte_buffer_reader_init(grpc_byte_buffer_reader *reader,
+ grpc_byte_buffer *buffer) {
+ gpr_slice_buffer decompressed_slices_buffer;
+ reader->buffer_in = buffer;
+ switch (reader->buffer_in->type) {
+ case GRPC_BB_RAW:
+ gpr_slice_buffer_init(&decompressed_slices_buffer);
+ if (is_compressed(reader->buffer_in)) {
+ grpc_msg_decompress(reader->buffer_in->data.raw.compression,
+ &reader->buffer_in->data.raw.slice_buffer,
+ &decompressed_slices_buffer);
+ reader->buffer_out =
+ grpc_raw_byte_buffer_create(decompressed_slices_buffer.slices,
+ decompressed_slices_buffer.count);
+ gpr_slice_buffer_destroy(&decompressed_slices_buffer);
+ } else { /* not compressed, use the input buffer as output */
+ reader->buffer_out = reader->buffer_in;
+ }
+ reader->current.index = 0;
+ break;
+ }
+}
+
+void grpc_byte_buffer_reader_destroy(grpc_byte_buffer_reader *reader) {
+ switch (reader->buffer_in->type) {
+ case GRPC_BB_RAW:
+ /* keeping the same if-else structure as in the init function */
+ if (is_compressed(reader->buffer_in)) {
+ grpc_byte_buffer_destroy(reader->buffer_out);
+ }
+ break;
+ }
+}
+
+int grpc_byte_buffer_reader_next(grpc_byte_buffer_reader *reader,
+ gpr_slice *slice) {
+ switch (reader->buffer_in->type) {
+ case GRPC_BB_RAW: {
+ gpr_slice_buffer *slice_buffer;
+ slice_buffer = &reader->buffer_out->data.raw.slice_buffer;
+ if (reader->current.index < slice_buffer->count) {
+ *slice = gpr_slice_ref(slice_buffer->slices[reader->current.index]);
+ reader->current.index += 1;
+ return 1;
+ }
+ break;
+ }
+ }
+ return 0;
+}
+
+gpr_slice grpc_byte_buffer_reader_readall(grpc_byte_buffer_reader *reader) {
+ gpr_slice in_slice;
+ size_t bytes_read = 0;
+ const size_t input_size = grpc_byte_buffer_length(reader->buffer_out);
+ gpr_slice out_slice = gpr_slice_malloc(input_size);
+ uint8_t *const outbuf = GPR_SLICE_START_PTR(out_slice); /* just an alias */
+
+ while (grpc_byte_buffer_reader_next(reader, &in_slice) != 0) {
+ const size_t slice_length = GPR_SLICE_LENGTH(in_slice);
+ memcpy(&(outbuf[bytes_read]), GPR_SLICE_START_PTR(in_slice), slice_length);
+ bytes_read += slice_length;
+ gpr_slice_unref(in_slice);
+ GPR_ASSERT(bytes_read <= input_size);
+ }
+ return out_slice;
+}