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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Chunk I/O
* =========
* Copyright 2018 Eduardo Silva <eduardo@monkey.io>
*
* 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 <chunkio/chunkio.h>
#include <chunkio/cio_utils.h>
#include <chunkio/chunkio_compat.h>
#include <chunkio/cio_memfs.h>
#include <chunkio/cio_log.h>
#include <stdio.h>
#include <string.h>
#include <limits.h>
struct cio_memfs *cio_memfs_open(struct cio_ctx *ctx, struct cio_stream *st,
struct cio_chunk *ch, int flags,
size_t size)
{
struct cio_memfs *mf;
(void) flags;
(void) ctx;
(void) ch;
(void) st;
mf = calloc(1, sizeof(struct cio_memfs));
if (!mf) {
cio_errno();
return NULL;
}
mf->crc_cur = cio_crc32_init();
mf->buf_data = malloc(size);
if (!mf->buf_data) {
cio_errno();
free(mf->name);
free(mf);
return NULL;
}
mf->buf_size = size;
mf->buf_len = 0;
if (ctx->realloc_size_hint > 0) {
mf->realloc_size = ctx->realloc_size_hint;
} else {
mf->realloc_size = cio_getpagesize() * 8;
}
return mf;
}
void cio_memfs_close(struct cio_chunk *ch)
{
struct cio_memfs *mf = ch->backend;
if (!mf) {
return;
}
free(mf->name);
free(mf->buf_data);
free(mf->meta_data);
free(mf);
}
int cio_memfs_write(struct cio_chunk *ch, const void *buf, size_t count)
{
size_t av_size;
size_t new_size;
char *tmp;
struct cio_memfs *mf = ch->backend;
if (count == 0) {
return 0;
}
/* Calculate available size */
av_size = (mf->buf_size - mf->buf_len);
if (av_size < count) {
/* Suggest initial new size */
new_size = mf->buf_size + mf->realloc_size;
while (new_size < (mf->buf_len + count)) {
new_size += mf->realloc_size;
}
tmp = realloc(mf->buf_data, new_size);
if (!tmp) {
cio_errno();
return -1;
}
mf->buf_data = tmp;
mf->buf_size = new_size;
}
memcpy(mf->buf_data + mf->buf_len, buf, count);
mf->buf_len += count;
return 0;
}
int cio_memfs_content_copy(struct cio_chunk *ch,
void **out_buf, size_t *out_size)
{
char *buf;
struct cio_memfs *mf = ch->backend;
buf = malloc(mf->buf_len + 1);
if (!buf) {
cio_errno();
return -1;
}
/* Copy the data and append an extra NULL byte */
memcpy(buf, mf->buf_data, mf->buf_len);
buf[mf->buf_len] = '\0';
*out_buf = buf;
*out_size = mf->buf_len;
return 0;
}
void cio_memfs_scan_dump(struct cio_ctx *ctx, struct cio_stream *st)
{
char tmp[PATH_MAX];
struct mk_list *head;
struct cio_memfs *mf;
struct cio_chunk *ch;
(void) ctx;
mk_list_foreach(head, &st->chunks) {
ch = mk_list_entry(head, struct cio_chunk, _head);
mf = ch->backend;
snprintf(tmp, sizeof(tmp) -1, "%s/%s", ch->st->name, ch->name);
printf(" %-60s", tmp);
printf("meta_len=%i, data_size=%zu\n", mf->meta_len, mf->buf_len);
}
}
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