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#include "catch.hpp"
#include "utils.hpp"
#include <osmium/io/detail/read_write.hpp>
#include <osmium/util/file.hpp>
/**
* Can read and seek around in files.
*/
TEST_CASE("Seek and read in files") {
/* gzipped data contains very few repetitions in the binary file format,
* which makes it easy to identify any problems. */
const int fd = osmium::io::detail::open_for_reading(with_data_dir("t/io/data.osm.gz"));
struct seek_expectation {
size_t offset;
unsigned char eight_bytes[8];
};
const seek_expectation expectations[] = {
{ 0x00, {0x1f, 0x8b, 0x08, 0x08, 0x19, 0x4a, 0x18, 0x54} },
{ 0x00, {0x1f, 0x8b, 0x08, 0x08, 0x19, 0x4a, 0x18, 0x54} }, /* repeat / jump back */
{ 0x21, {0x56, 0xc6, 0x18, 0xc3, 0xea, 0x6d, 0x4f, 0xe0} }, /* unaligned */
{ 0xb3, {0xcd, 0x0a, 0xe7, 0x8f, 0xde, 0x00, 0x00, 0x00} }, /* close to end */
{ 0x21, {0x56, 0xc6, 0x18, 0xc3, 0xea, 0x6d, 0x4f, 0xe0} }, /* "long" backward jump */
};
for (const auto& expect : expectations) {
char actual_eight_bytes[8] = {0, 0, 0, 0, 0, 0, 0, 0};
osmium::util::file_seek(fd, expect.offset);
const bool did_actually_read = osmium::io::detail::read_exactly(fd, &actual_eight_bytes[0], 8);
REQUIRE(did_actually_read);
for (int i = 0; i < 8; ++i) {
REQUIRE(expect.eight_bytes[i] == static_cast<unsigned char>(actual_eight_bytes[i]));
}
}
}
TEST_CASE("Seek close to end of file") {
/* gzipped data contains very few repetitions in the binary file format,
* which makes it easy to identify any problems. */
const int fd = osmium::io::detail::open_for_reading(with_data_dir("t/io/data.osm.gz"));
REQUIRE(osmium::util::file_size(with_data_dir("t/io/data.osm.gz")) == 187);
char actual_eight_bytes[8] = {1, 1, 1, 1, 1, 1, 1, 1};
osmium::util::file_seek(fd, 186);
const auto actually_read = osmium::io::detail::reliable_read(fd, &actual_eight_bytes[0], 8);
REQUIRE(actually_read == 1);
REQUIRE(actual_eight_bytes[0] == 0);
REQUIRE(actual_eight_bytes[1] == 1);
}
TEST_CASE("Seek to exact end of file") {
/* gzipped data contains very few repetitions in the binary file format,
* which makes it easy to identify any problems. */
const int fd = osmium::io::detail::open_for_reading(with_data_dir("t/io/data.osm.gz"));
REQUIRE(osmium::util::file_size(with_data_dir("t/io/data.osm.gz")) == 187);
char actual_eight_bytes[8] = {1, 1, 1, 1, 1, 1, 1, 1};
osmium::util::file_seek(fd, 187);
const auto actually_read = osmium::io::detail::reliable_read(fd, &actual_eight_bytes[0], 8);
REQUIRE(actually_read == 0);
REQUIRE(actual_eight_bytes[0] == 1);
REQUIRE(actual_eight_bytes[1] == 1);
}
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