78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
/*
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* Copyright (c) 2012-2013 Spotify AB
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* 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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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#include <stddef.h>
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#include <unistd.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include "util.h"
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#include "endiantools.h"
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#include "buf.h"
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sparkey_returncode buf_init(sparkey_buf *buf, ptrdiff_t size) {
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buf->start = malloc(size);
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if (buf->start == NULL) {
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return SPARKEY_INTERNAL_ERROR;
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}
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buf->cur = buf->start;
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buf->end = buf->start + size;
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return SPARKEY_SUCCESS;
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}
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void buf_close(sparkey_buf *buf) {
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free(buf->start);
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buf->start = NULL;
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buf->cur = NULL;
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buf->end = NULL;
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}
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uint64_t buf_size(sparkey_buf *buf) {
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return buf->end - buf->start;
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}
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uint64_t buf_remaining(sparkey_buf *buf) {
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return buf->end - buf->cur;
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}
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uint64_t buf_used(sparkey_buf *buf) {
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return buf->cur - buf->start;
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}
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sparkey_returncode buf_flushfile(sparkey_buf *buf, int fd) {
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RETHROW(write_full(fd, buf->start, buf_used(buf)));
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buf->cur = buf->start;
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return SPARKEY_SUCCESS;
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}
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sparkey_returncode buf_add(sparkey_buf *buf, int fd, const uint8_t *data, ptrdiff_t len) {
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while (1) {
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ptrdiff_t remaining = buf_remaining(buf);
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if (remaining >= len) {
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memcpy(buf->cur, data, len);
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buf->cur += len;
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return SPARKEY_SUCCESS;
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} else {
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memcpy(buf->cur, data, remaining);
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buf->cur += remaining;
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data += remaining;
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len -= remaining;
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RETHROW(buf_flushfile(buf, fd));
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}
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}
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return SPARKEY_SUCCESS;
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}
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