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test_mmap.c
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/*
Copyright (c) 2021 Blosc Development Team <blosc@blosc.org>
https://blosc.org
License: BSD 3-Clause (see LICENSE.txt)
*/
#include "test_common.h"
#include "cutest.h"
bool are_files_identical(const char* filename1, const char* filename2) {
FILE *file1 = fopen(filename1, "rb");
FILE *file2 = fopen(filename2, "rb");
if (file1 == NULL || file2 == NULL) {
return false;
}
/* Compare file sizes */
fseek(file1, 0, SEEK_END);
fseek(file2, 0, SEEK_END);
size_t file_size1 = ftell(file1);
size_t file_size2 = ftell(file2);
if (file_size1 != file_size2) {
fclose(file1);
fclose(file2);
return false;
}
/* Compare file contents */
fseek(file1, 0, SEEK_SET);
fseek(file2, 0, SEEK_SET);
char* buffer1 = (char*)malloc(file_size1);
char* buffer2 = (char*)malloc(file_size2);
size_t count = fread(buffer1, 1, file_size1, file1);
CUTEST_ASSERT("Could not read file 1", count == file_size1);
count = fread(buffer2, 1, file_size2, file2);
CUTEST_ASSERT("Could not read file 2", count == file_size2);
fclose(file1);
fclose(file2);
bool are_identical = memcmp(buffer1, buffer2, file_size1) == 0;
free(buffer1);
free(buffer2);
return are_identical;
}
CUTEST_TEST_DATA(mmap) {
blosc2_cparams cparams;
};
CUTEST_TEST_SETUP(mmap) {
blosc2_init();
data->cparams = BLOSC2_CPARAMS_DEFAULTS;
data->cparams.typesize = sizeof(float);
data->cparams.compcode = BLOSC_BLOSCLZ;
data->cparams.clevel = 9;
data->cparams.nthreads = 1;
blosc2_stdio_mmap mmap_file_default = BLOSC2_STDIO_MMAP_DEFAULTS;
/* We also want to trigger the remapping */
CUTEST_PARAMETRIZE(initial_mapping_size, int64_t, CUTEST_DATA(
1, mmap_file_default.initial_mapping_size,
));
}
CUTEST_TEST_TEST(mmap) {
CUTEST_GET_PARAMETER(initial_mapping_size, int64_t);
char* urlpath_default = "test_mmap_default.b2frame";
char* urlpath_mmap = "test_mmap_mmap.b2frame";
blosc2_remove_urlpath(urlpath_default);
blosc2_remove_urlpath(urlpath_mmap);
/* New file using default I/O */
blosc2_storage storage_default = {.cparams=&data->cparams, .contiguous=true, .urlpath = urlpath_default};
blosc2_schunk *schunk_write_default = blosc2_schunk_new(&storage_default);
float data_buffer[2] = {0.1, 0.2};
int64_t cbytes = blosc2_schunk_append_buffer(schunk_write_default, data_buffer, sizeof(data_buffer));
CUTEST_ASSERT("Could not write first chunk", cbytes > 0);
float data_buffer2[2] = {0.3, 0.4};
cbytes = blosc2_schunk_append_buffer(schunk_write_default, data_buffer2, sizeof(data_buffer2));
CUTEST_ASSERT("Could not write second chunk", cbytes > 0);
/* New file using memory-mapped I/O */
blosc2_stdio_mmap mmap_file = BLOSC2_STDIO_MMAP_DEFAULTS;
mmap_file.mode = "w+";
mmap_file.initial_mapping_size = initial_mapping_size;
blosc2_io io = {.id = BLOSC2_IO_FILESYSTEM_MMAP, .name = "filesystem_mmap", .params = &mmap_file};
blosc2_storage storage_mmap = {.cparams=&data->cparams, .contiguous=true, .urlpath = urlpath_mmap, .io=&io};
blosc2_schunk *schunk_write_mmap = blosc2_schunk_new(&storage_mmap);
cbytes = blosc2_schunk_append_buffer(schunk_write_mmap, data_buffer, sizeof(data_buffer));
CUTEST_ASSERT("Could not write first chunk", cbytes > 0);
cbytes = blosc2_schunk_append_buffer(schunk_write_mmap, data_buffer2, sizeof(data_buffer2));
CUTEST_ASSERT("Could not write second chunk", cbytes > 0);
blosc2_schunk_free(schunk_write_default);
blosc2_schunk_free(schunk_write_mmap);
/* The compressed file content should not depend on the I/O which created it */
CUTEST_ASSERT("Files are not identical", are_files_identical(urlpath_default, urlpath_mmap));
/* Read the schunk data back again (using mmap) */
mmap_file = BLOSC2_STDIO_MMAP_DEFAULTS;
mmap_file.mode = "r";
mmap_file.initial_mapping_size = initial_mapping_size;
io.params = &mmap_file;
blosc2_schunk* schunk_read = blosc2_schunk_open_udio(urlpath_mmap, &io);
CUTEST_ASSERT("Mismatch in number of chunks", schunk_read->nchunks == 2);
float* chunk_data = (float*)malloc(schunk_read->chunksize);
int dsize = blosc2_schunk_decompress_chunk(schunk_read, 0, chunk_data, schunk_read->chunksize);
CUTEST_ASSERT("Size of decompressed chunk 1 does not match", dsize == sizeof(data_buffer));
CUTEST_ASSERT("Value 1 of chunk 1 is wrong", fabs(chunk_data[0] - 0.1) < 1e-6);
CUTEST_ASSERT("Value 2 of chunk 1 is wrong", fabs(chunk_data[1] - 0.2) < 1e-6);
dsize = blosc2_schunk_decompress_chunk(schunk_read, 1, chunk_data, schunk_read->chunksize);
CUTEST_ASSERT("Size of decompressed chunk 1 does not match", dsize == sizeof(data_buffer2));
CUTEST_ASSERT("Value 1 of chunk 2 is wrong", fabs(chunk_data[0] - 0.3) < 1e-6);
CUTEST_ASSERT("Value 2 of chunk 2 is wrong", fabs(chunk_data[1] - 0.4) < 1e-6);
blosc2_schunk_free(schunk_read);
#if defined(__linux__)
/* Append some data to the existing schunk in memory (does not work on Windows) */
mmap_file = BLOSC2_STDIO_MMAP_DEFAULTS;
mmap_file.mode = "c";
mmap_file.initial_mapping_size = initial_mapping_size;
io.params = &mmap_file;
blosc2_schunk* schunk_memory = blosc2_schunk_open_udio(urlpath_mmap, &io);
float data_buffer_memory[2] = {0.5, 0.6};
cbytes = blosc2_schunk_append_buffer(schunk_memory, data_buffer_memory, sizeof(data_buffer_memory));
CUTEST_ASSERT("Could not write third chunk", cbytes > 0);
dsize = blosc2_schunk_decompress_chunk(schunk_memory, 1, chunk_data, schunk_memory->chunksize);
CUTEST_ASSERT("Size of decompressed chunk 1 does not match", dsize == sizeof(data_buffer2));
CUTEST_ASSERT("Value 1 of chunk 2 is wrong", fabs(chunk_data[0] - 0.3) < 1e-6);
CUTEST_ASSERT("Value 2 of chunk 2 is wrong", fabs(chunk_data[1] - 0.4) < 1e-6);
dsize = blosc2_schunk_decompress_chunk(schunk_memory, 2, chunk_data, schunk_memory->chunksize);
CUTEST_ASSERT("Size of decompressed chunk 1 does not match", dsize == sizeof(data_buffer_memory));
CUTEST_ASSERT("Value 1 of chunk 2 is wrong", fabs(chunk_data[0] - 0.5) < 1e-6);
CUTEST_ASSERT("Value 2 of chunk 2 is wrong", fabs(chunk_data[1] - 0.6) < 1e-6);
blosc2_schunk_free(schunk_memory);
CUTEST_ASSERT("Files are not identical", are_files_identical(urlpath_default, urlpath_mmap));
#endif
/* Append some data to the existing schunk */
mmap_file = BLOSC2_STDIO_MMAP_DEFAULTS;
mmap_file.mode = "r+";
mmap_file.initial_mapping_size = initial_mapping_size;
io.params = &mmap_file;
blosc2_schunk* schunk_append = blosc2_schunk_open_udio(urlpath_mmap, &io);
float data_buffer3[2] = {0.5, 0.6};
cbytes = blosc2_schunk_append_buffer(schunk_append, data_buffer3, sizeof(data_buffer3));
CUTEST_ASSERT("Could not write third chunk", cbytes > 0);
dsize = blosc2_schunk_decompress_chunk(schunk_append, 1, chunk_data, schunk_append->chunksize);
CUTEST_ASSERT("Size of decompressed chunk 1 does not match", dsize == sizeof(data_buffer2));
CUTEST_ASSERT("Value 1 of chunk 2 is wrong", fabs(chunk_data[0] - 0.3) < 1e-6);
CUTEST_ASSERT("Value 2 of chunk 2 is wrong", fabs(chunk_data[1] - 0.4) < 1e-6);
dsize = blosc2_schunk_decompress_chunk(schunk_append, 2, chunk_data, schunk_append->chunksize);
CUTEST_ASSERT("Size of decompressed chunk 1 does not match", dsize == sizeof(data_buffer2));
CUTEST_ASSERT("Value 1 of chunk 2 is wrong", fabs(chunk_data[0] - 0.5) < 1e-6);
CUTEST_ASSERT("Value 2 of chunk 2 is wrong", fabs(chunk_data[1] - 0.6) < 1e-6);
blosc2_schunk_free(schunk_append);
CUTEST_ASSERT("Files are identical", !are_files_identical(urlpath_default, urlpath_mmap));
free(chunk_data);
return 0;
}
CUTEST_TEST_TEARDOWN(mmap) {
BLOSC_UNUSED_PARAM(data);
blosc2_destroy();
}
int main() {
CUTEST_TEST_RUN(mmap);
}