/* Copyright (c) 2020 Dovecot authors, see the included COPYING file */

#include "lib.h"

#include "buffer.h"

#include "eacces-error.h"

#include "istream.h"

enum buffer_append_result

buffer_append_full_istream(buffer_t *buf, struct istream *is, size_t max_read_size,

         const char **error_r)

{

  const unsigned char *data;

  size_t size;

  ssize_t ret;

  while ((ret = i_stream_read_more(is, &data, &size)) > 0) {

    if (max_read_size == 0)

      return BUFFER_APPEND_READ_MAX_SIZE;

    size = I_MIN(max_read_size, size);

    buffer_append(buf, data, size);

    i_stream_skip(is, size);

    max_read_size -= size;

  }

  if (ret == 0)

    return BUFFER_APPEND_READ_MORE;

  i_assert(is->eof);

  if (is->stream_errno != 0) {

    *error_r = t_strdup(i_stream_get_error(is));

    return BUFFER_APPEND_READ_ERROR;

  }

  return BUFFER_APPEND_OK;

}

enum buffer_append_result

buffer_append_full_file(buffer_t *buf, const char *file, size_t max_read_size,

      const char **error_r)

{

  struct istream *is = i_stream_create_file(file, IO_BLOCK_SIZE);

  enum buffer_append_result res =

    buffer_append_full_istream(buf, is, max_read_size, error_r);

  if (is->stream_errno == EACCES)

    *error_r = eacces_error_get("open", file);

  i_stream_unref(&is);

  i_assert(res != BUFFER_APPEND_READ_MORE);

  return res;

}