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response_headers.cpp
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86 lines (77 loc) · 2.91 KB
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// Copyright 2018 The Emscripten Authors. All rights reserved.
// Emscripten is available under two separate licenses, the MIT license and the
// University of Illinois/NCSA Open Source License. Both these licenses can be
// found in the LICENSE file.
#include <string.h>
#include <stdio.h>
#include <math.h>
#include <assert.h>
#include <emscripten/fetch.h>
int result = 0;
int main()
{
static const char* const headers[] = {
"X-Emscripten-Test",
"1",
0,
};
const size_t n_values = sizeof( headers ) / sizeof( headers[ 0 ] ) - 1;
emscripten_fetch_attr_t attr;
emscripten_fetch_attr_init( &attr );
strcpy( attr.requestMethod, "GET" );
attr.attributes = EMSCRIPTEN_FETCH_REPLACE | EMSCRIPTEN_FETCH_LOAD_TO_MEMORY | EMSCRIPTEN_FETCH_SYNCHRONOUS;
attr.requestHeaders = headers;
attr.onsuccess = [] ( emscripten_fetch_t *fetch )
{
assert( fetch->__attributes.requestHeaders != 0 );
assert( fetch->__attributes.requestHeaders != headers );
for ( size_t i = 0; i < n_values; ++i )
{
const char* origHeader = headers[ i ];
const char* header = fetch->__attributes.requestHeaders[ i ];
assert( origHeader != header );
assert( strcmp( origHeader, header ) == 0 );
}
assert( fetch->__attributes.requestHeaders[ n_values ] == 0 );
printf( "Finished downloading %llu bytes\n", fetch->numBytes );
// Compute rudimentary checksum of data
uint8_t checksum = 0;
for ( int i = 0; i < fetch->numBytes; ++i )
checksum ^= fetch->data[ i ];
printf( "Data checksum: %02X\n", checksum );
assert( checksum == 0x08 );
emscripten_fetch_close( fetch );
if ( result == 0 ) result = 1;
#ifdef REPORT_RESULT
// Fetch API appears to sometimes call the handlers more than once, see https://github.com/emscripten-core/emscripten/pull/8191
MAYBE_REPORT_RESULT(result);
#endif
};
attr.onprogress = [] ( emscripten_fetch_t *fetch )
{
if ( fetch->totalBytes > 0 )
{
printf( "Downloading.. %.2f%% complete.\n", ( fetch->dataOffset + fetch->numBytes ) * 100.0 / fetch->totalBytes );
}
else
{
printf( "Downloading.. %lld bytes complete.\n", fetch->dataOffset + fetch->numBytes );
}
};
attr.onerror = [] ( emscripten_fetch_t *fetch )
{
printf( "Download failed!\n" );
emscripten_fetch_close(fetch);
assert( false && "Shouldn't fail!" );
};
emscripten_fetch_t *fetch = emscripten_fetch( &attr, "gears.png" );
if ( result == 0 )
{
result = 2;
printf( "emscripten_fetch() failed to run synchronously!\n" );
}
#ifdef REPORT_RESULT
// Fetch API appears to sometimes call the handlers more than once, see https://github.com/emscripten-core/emscripten/pull/8191
MAYBE_REPORT_RESULT(result);
#endif
}