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mirror of https://github.com/falk-werner/webfuse synced 2024-10-27 20:34:10 +00:00
falk-werner_webfuse/lib/webfuse/impl/operation/readdir.c
2020-06-28 19:43:08 +02:00

161 lines
3.7 KiB
C

#include "webfuse/impl/operation/readdir.h"
#include "webfuse/impl/operation/context.h"
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include "webfuse/impl/jsonrpc/proxy.h"
#include "webfuse/impl/util/util.h"
#include "webfuse/impl/util/json_util.h"
#define WF_DIRBUFFER_INITIAL_SIZE 1024
struct wf_impl_dirbuffer
{
char * data;
size_t position;
size_t capacity;
};
static void wf_impl_dirbuffer_init(
struct wf_impl_dirbuffer * buffer)
{
buffer->data = malloc(WF_DIRBUFFER_INITIAL_SIZE);
buffer->position = 0;
buffer->capacity = WF_DIRBUFFER_INITIAL_SIZE;
}
static void wf_impl_dirbuffer_dispose(
struct wf_impl_dirbuffer * buffer)
{
free(buffer->data);
}
static void wf_impl_dirbuffer_add(
fuse_req_t request,
struct wf_impl_dirbuffer * buffer,
char const * name,
fuse_ino_t inode)
{
size_t const size = fuse_add_direntry(request, NULL, 0, name, NULL, 0);
size_t remaining = buffer->capacity - buffer->position;
while (remaining < size)
{
buffer->capacity *= 2;
buffer->data = realloc(buffer->data, buffer->capacity);
remaining = buffer->capacity - buffer->position;
}
struct stat stat_buffer;
memset(&stat_buffer, 0, sizeof(struct stat));
stat_buffer.st_ino = inode;
fuse_add_direntry(request,
&buffer->data[buffer->position], remaining, name,
&stat_buffer, buffer->position + size);
buffer->position += size;
}
static size_t wf_impl_min(size_t a, size_t b)
{
return (a < b) ? a : b;
}
void wf_impl_operation_readdir_finished(
void * user_data,
json_t const * result,
json_t const * error)
{
wf_status status = wf_impl_jsonrpc_get_status(error);
struct wf_impl_operation_readdir_context * context = user_data;
struct wf_impl_dirbuffer buffer;
wf_impl_dirbuffer_init(&buffer);
if (json_is_array(result))
{
size_t const count = json_array_size(result);
for(size_t i = 0; i < count; i++)
{
json_t * entry =json_array_get(result, i);
if (json_is_object(entry))
{
json_t * name_holder = json_object_get(entry, "name");
json_t * inode_holder = json_object_get(entry, "inode");
if ((json_is_string(name_holder)) && (json_is_integer(inode_holder)))
{
char const * name = json_string_value(name_holder);
fuse_ino_t entry_inode = (fuse_ino_t) json_integer_value(inode_holder);
wf_impl_dirbuffer_add(context->request, &buffer, name, entry_inode);
}
else
{
status = WF_BAD_FORMAT;
break;
}
}
else
{
status = WF_BAD_FORMAT;
break;
}
}
}
else if (WF_GOOD == status)
{
status = WF_BAD_FORMAT;
}
if (WF_GOOD == status)
{
if (((size_t) context->offset) < buffer.position)
{
fuse_reply_buf(context->request, &buffer.data[context->offset],
wf_impl_min(buffer.position - context->offset, context->size));
}
else
{
fuse_reply_buf(context->request, NULL, 0);
}
}
else
{
fuse_reply_err(context->request, ENOENT);
}
wf_impl_dirbuffer_dispose(&buffer);
free(context);
}
void wf_impl_operation_readdir (
fuse_req_t request,
fuse_ino_t inode,
size_t size,
off_t offset,
struct fuse_file_info * WF_UNUSED_PARAM(file_info))
{
struct wf_impl_operation_context * user_data = fuse_req_userdata(request);
struct wf_jsonrpc_proxy * rpc = wf_impl_operation_context_get_proxy(user_data);
if (NULL != rpc)
{
struct wf_impl_operation_readdir_context * readdir_context = malloc(sizeof(struct wf_impl_operation_readdir_context));
readdir_context->request = request;
readdir_context->size = size;
readdir_context->offset = offset;
wf_impl_jsonrpc_proxy_invoke(rpc, &wf_impl_operation_readdir_finished, readdir_context, "readdir", "si", user_data->name, inode);
}
else
{
fuse_reply_err(request, ENOENT);
}
}