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