2019-01-29 22:11:46 +00:00
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#include "wsfs/operations.h"
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#include <string.h>
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2019-01-29 22:47:08 +00:00
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#include <limits.h>
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2019-01-29 22:11:46 +00:00
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#include <jansson.h>
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#include "wsfs/jsonrpc.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
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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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int wsfs_operation_read(
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const char * path,
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char * buffer,
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size_t buffer_size,
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off_t offset,
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2019-01-29 22:47:08 +00:00
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struct fuse_file_info * file_info)
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2019-01-29 22:11:46 +00:00
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{
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struct fuse_context * context = fuse_get_context();
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struct wsfs_jsonrpc * rpc = context->private_data;
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int const length = (buffer_size <= WSFS_MAX_READ_LENGTH) ? (int) buffer_size : WSFS_MAX_READ_LENGTH;
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int result = 0;
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json_t * data = NULL;
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2019-01-29 22:47:08 +00:00
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int handle = (file_info->fh & INT_MAX);
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wsfs_status status = wsfs_jsonrpc_invoke(rpc, &data, "read", "siii", path, handle, (int) offset, length);
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2019-01-29 22:11:46 +00:00
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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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int const count = json_integer_value(count_holder);
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status = wsfs_fill_buffer(buffer, buffer_size, format, data, count);
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if (WSFS_GOOD == status)
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{
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result = count;
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}
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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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json_decref(data);
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}
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if (WSFS_GOOD != status)
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{
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result = wsfs_status_to_rc(status);
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}
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return result;
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}
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