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98 lines
2.3 KiB
98 lines
2.3 KiB
#include "wsfs/operations.h"
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#include <errno.h>
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#include <string.h>
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#include <limits.h>
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#include <jansson.h>
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#include <libwebsockets.h>
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#include "wsfs/jsonrpc/server.h"
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#define WSFS_MAX_READ_LENGTH 4096
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static wsfs_status wsfs_fill_buffer(
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char * buffer,
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size_t buffer_size,
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char const * format,
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char const * data,
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size_t count)
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{
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wsfs_status status = WSFS_GOOD;
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size_t const copy_count = (buffer_size < count) ? buffer_size : count;
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if (0 < copy_count)
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{
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if (0 == strcmp("identity", format))
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{
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memcpy(buffer, data, copy_count);
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}
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else if (0 == strcmp("base64", format))
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{
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lws_b64_decode_string(data, buffer, copy_count);
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}
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else
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{
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status = WSFS_BAD;
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}
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}
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return status;
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}
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static void wsfs_operation_read_finished(void * user_data, wsfs_status status, json_t const * data)
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{
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fuse_req_t request = user_data;
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char * buffer = NULL;
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size_t length = 0;
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if (NULL != data)
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{
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json_t * data_holder = json_object_get(data, "data");
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json_t * format_holder = json_object_get(data, "format");
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json_t * count_holder = json_object_get(data, "count");
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if ((NULL != data_holder) && (json_is_string(data_holder)) &&
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(NULL != format_holder) && (json_is_string(format_holder)) &&
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(NULL != count_holder) && (json_is_integer(count_holder)))
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{
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char const * const data = json_string_value(data_holder);
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char const * const format = json_string_value(format_holder);
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length = (size_t) json_integer_value(count_holder);
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buffer = malloc(length);
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status = wsfs_fill_buffer(buffer, length, format, data, length);
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}
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else
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{
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status = WSFS_BAD_FORMAT;
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}
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}
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if (WSFS_GOOD == status)
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{
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fuse_reply_buf(request, buffer, length);
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}
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else
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{
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fuse_reply_err(request, ENOENT);
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}
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free(buffer);
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}
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void wsfs_operation_read(
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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 * file_info)
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{
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struct wsfs_operations_context * user_data = fuse_req_userdata(request);
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struct wsfs_jsonrpc_server * rpc = user_data->rpc;
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int const length = (size <= WSFS_MAX_READ_LENGTH) ? (int) size : WSFS_MAX_READ_LENGTH;
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int handle = (file_info->fh & INT_MAX);
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wsfs_jsonrpc_server_invoke(rpc, &wsfs_operation_read_finished, request, "read", "iiii", inode, handle, (int) offset, length);
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}
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