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76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
/*
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* Copyright 2024 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "buffer.h"
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#include "system/logging.h"
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#include "system/passert.h"
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#include "kernel/pbl_malloc.h"
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#include <string.h>
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size_t buffer_get_bytes_remaining(Buffer *b) {
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return (b->length - b->bytes_written);
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}
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size_t buffer_add(Buffer* const b, const uint8_t* const data, const size_t length) {
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PBL_ASSERTN(b);
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PBL_ASSERTN(data);
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PBL_ASSERTN(length);
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if (buffer_get_bytes_remaining(b) < length) {
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return 0;
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}
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uint8_t* cursor = b->data + b->bytes_written;
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memcpy(cursor, data, length);
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b->bytes_written += length;
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return length;
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}
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size_t buffer_remove(Buffer* const b, const size_t offset, const size_t length) {
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PBL_ASSERTN(offset + length <= b->bytes_written);
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memmove(&b->data[offset], &b->data[offset + length], b->bytes_written - length - offset);
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b->bytes_written -= length;
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return length;
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}
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Buffer* buffer_create(const size_t size_bytes) {
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PBL_ASSERTN(size_bytes);
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Buffer* b = kernel_malloc_check(sizeof(Buffer) + size_bytes);
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*b = (Buffer) {
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.length = size_bytes,
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.bytes_written = 0,
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};
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return b;
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}
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void buffer_init(Buffer * const buffer, const size_t length) {
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buffer->bytes_written = 0;
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buffer->length = length;
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}
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void buffer_clear(Buffer * const buffer) {
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buffer->bytes_written = 0;
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}
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bool buffer_is_empty(Buffer * const buffer) {
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return buffer->bytes_written == 0;
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}
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