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128 lines
2.7 KiB
128 lines
2.7 KiB
#include "webfuse/adapter/impl/operation/read.h"
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#include "webfuse/adapter/impl/operation/context.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 "webfuse/core/jsonrpc/proxy.h"
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#include "webfuse/core/base64.h"
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#include "webfuse/core/json_util.h"
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#define WF_MAX_READ_LENGTH 4096
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char * wf_impl_fill_buffer(
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char const * data,
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size_t data_size,
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char const * format,
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size_t count,
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wf_status * status)
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{
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*status = WF_GOOD;
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char * buffer = malloc(count);
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if (0 < count)
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{
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if (0 == strcmp("identity", format))
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{
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if (count == data_size)
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{
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memcpy(buffer, data, count);
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}
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else
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{
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*status = WF_BAD;
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}
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}
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else if (0 == strcmp("base64", format))
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{
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size_t result = wf_base64_decode(data, data_size, (uint8_t *) buffer, count);
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if (result != count)
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{
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*status = WF_BAD;
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}
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}
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else
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{
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*status = WF_BAD;
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}
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}
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if (WF_GOOD != *status)
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{
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free(buffer);
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buffer = NULL;
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}
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return buffer;
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}
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void wf_impl_operation_read_finished(
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void * user_data,
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json_t const * result,
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json_t const * error)
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{
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wf_status status = wf_impl_jsonrpc_get_status(error);
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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 != result)
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{
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json_t * data_holder = json_object_get(result, "data");
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json_t * format_holder = json_object_get(result, "format");
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json_t * count_holder = json_object_get(result, "count");
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if (json_is_string(data_holder) &&
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json_is_string(format_holder) &&
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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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size_t const data_size = json_string_length(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 = wf_impl_fill_buffer(data, data_size, format, length, &status);
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}
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else
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{
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status = WF_BAD_FORMAT;
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}
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}
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if (WF_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 wf_impl_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 wf_impl_operation_context * user_data = fuse_req_userdata(request);
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struct wf_jsonrpc_proxy * rpc = wf_impl_operation_context_get_proxy(user_data);
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if (NULL != rpc)
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{
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int const length = (size <= WF_MAX_READ_LENGTH) ? (int) size : WF_MAX_READ_LENGTH;
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int handle = (file_info->fh & INT_MAX);
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wf_jsonrpc_proxy_invoke(rpc, &wf_impl_operation_read_finished, request, "read", "siiii", user_data->name, (int) inode, handle, (int) offset, 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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}
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