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Update test.cpp

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This commit is contained in:
mandreyel 2019-03-13 00:06:06 +01:00
parent 18fbf199ec
commit 514837b21e
1 changed files with 27 additions and 13 deletions
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40
test/test.cpp
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@ -4,8 +4,10 @@
#include <string>
#include <fstream>
#include <cstdlib>
#include <iostream>
#include <cassert>
#include <system_error>
#include <numeric>
int handle_error(const std::error_code& error)
{
@ -29,25 +31,34 @@ int main()
std::copy(_path, _path + path_len, path);
std::error_code error;
// Fill buffer, then write it to file.
std::string buffer(0x4000 - 250, 'M');
const int file_size = 0x4000 - 250;
std::string buffer(file_size, 0);
std::iota(buffer.begin(), buffer.end(), 1);
std::ofstream file(path);
file << buffer;
file.close();
const size_t offset = 300;
assert(offset < buffer.size());
{
// Map the region of the file to which buffer was written.
mio::mmap_source file_view = mio::make_mmap_source(
path, 0, mio::map_entire_file, error);
path, offset, mio::map_entire_file, error);
if(error) { return handle_error(error); }
const size_t mapped_size = buffer.size() - offset;
assert(file_view.is_open());
assert(file_view.size() == buffer.size());
assert(file_view.size() == mapped_size);
// Then verify that mmap's bytes correspond to that of buffer.
for(auto i = 0; i < buffer.size(); ++i) {
if(file_view[i] != buffer[i]) {
std::printf("%ith byte mismatch: expected(%i) <> actual(%i)",
i, buffer[i], file_view[i]);
for(size_t buf_idx = offset, view_idx = 0;
buf_idx < buffer.size() && view_idx < mapped_size;
++buf_idx, ++view_idx) {
if(file_view[view_idx] != buffer[buf_idx]) {
std::printf("%luth byte mismatch: expected(%d) <> actual(%d)",
buf_idx, buffer[buf_idx], file_view[view_idx]);
std::cout << std::flush;
assert(0);
}
}
@ -57,13 +68,16 @@ int main()
assert(!file_view.is_open());
assert(shared_file_view.is_open());
assert(shared_file_view.size() == buffer.size());
assert(shared_file_view.size() == mapped_size);
// Then verify that mmap's bytes correspond to that of buffer.
for(auto i = 0; i < buffer.size(); ++i) {
if(shared_file_view[i] != buffer[i]) {
std::printf("%ith byte mismatch: expected(%i) <> actual(%i)",
i, buffer[i], shared_file_view[i]);
// Then verify that shared_mmap's bytes correspond to that of buffer.
for(size_t buf_idx = offset, view_idx = 0;
buf_idx < buffer.size() && view_idx < mapped_size;
++buf_idx, ++view_idx) {
if(shared_file_view[view_idx] != buffer[buf_idx]) {
std::printf("%luth byte mismatch: expected(%d) <> actual(%d)",
buf_idx, buffer[buf_idx], shared_file_view[view_idx]);
std::cout << std::flush;
assert(0);
}
}