int main()
{
// Seed the random number generator to produce different data every time
srand(time(NULL));
// Set the number of symbols and the symbol size
uint32_t max_symbols = 10;
uint32_t max_symbol_size = 100;
// Here we select the codec we wish to use
int32_t codec = kodoc_reed_solomon;
// Here we select the finite field to use.
// For the Reed-Solomon codec, we need to choose kodoc_binary8
int32_t finite_field = kodoc_binary8;
kodoc_factory_t encoder_factory =
kodoc_new_encoder_factory(codec, finite_field,
max_symbols, max_symbol_size);
kodoc_factory_t decoder_factory =
kodoc_new_decoder_factory(codec, finite_field,
max_symbols, max_symbol_size);
kodoc_coder_t encoder = kodoc_factory_build_coder(encoder_factory);
kodoc_coder_t decoder = kodoc_factory_build_coder(decoder_factory);
// Allocate some storage for a "payload". The payload is what we would
// eventually send over a network.
uint32_t bytes_used;
uint32_t payload_size = kodoc_payload_size(encoder);
uint8_t* payload = (uint8_t*) malloc(payload_size);
// Allocate input and output data buffers
uint32_t block_size = kodoc_block_size(encoder);
uint8_t* data_in = (uint8_t*) malloc(block_size);
uint8_t* data_out = (uint8_t*) malloc(block_size);
// Fill the input buffer with random data
uint32_t i = 0;
for(; i < block_size; ++i)
data_in[i] = rand() % 256;
// Assign the data buffers to the encoder and decoder
kodoc_set_const_symbols(encoder, data_in, block_size);
kodoc_set_mutable_symbols(decoder, data_out, block_size);
// Install a custom trace function for the decoder
kodoc_set_trace_callback(decoder, trace_callback, NULL);
uint32_t lost_payloads = 0;
uint32_t received_payloads = 0;
while (!kodoc_is_complete(decoder))
{
// The encoder will use a certain amount of bytes of the payload buffer
bytes_used = kodoc_write_payload(encoder, payload);
printf("Payload generated by encoder, bytes used = %d\n", bytes_used);
// Simulate a channel with a 50% loss rate
if (rand() % 2)
{
lost_payloads++;
printf("Symbol lost on channel\n\n");
continue;
}
// Pass the generated packet to the decoder
received_payloads++;
kodoc_read_payload(decoder, payload);
printf("Payload processed by decoder, current rank = %d\n\n",
kodoc_rank(decoder));
}
printf("Number of lost payloads: %d\n", lost_payloads);
printf("Number of received payloads: %d\n", received_payloads);
// Check that we properly decoded the data
if (memcmp(data_in, data_out, block_size) == 0)
{
printf("Data decoded correctly\n");
}
else
{
printf("Unexpected failure to decode, please file a bug report :)\n");
}
// Free the allocated buffers and the kodo objects
free(data_in);
free(data_out);
free(payload);
kodoc_delete_coder(encoder);
kodoc_delete_coder(decoder);
kodoc_delete_factory(encoder_factory);
kodoc_delete_factory(decoder_factory);
return 0;
}
int main()
{
// Seed the random number generator to produce different data every time
srand(time(NULL));
// Set the number of symbols (i.e. the generation size in RLNC
// terminology) and the size of a symbol in bytes
uint32_t max_symbols = 10;
uint32_t max_symbol_size = 100;
// Here we select the codec we wish to use
int32_t codec = kodoc_full_vector;
// Here we select the finite field to use.
// Some common choices are: kodoc_binary, kodoc_binary4, kodoc_binary8
int32_t finite_field = kodoc_binary;
// First, we create an encoder & decoder factory.
// The factories are used to build actual encoders/decoders
kodoc_factory_t encoder_factory =
kodoc_new_encoder_factory(codec, finite_field,
max_symbols, max_symbol_size);
kodoc_factory_t decoder_factory =
kodoc_new_decoder_factory(codec, finite_field,
max_symbols, max_symbol_size);
// If we wanted to build an encoder or decoder with a smaller number of
// symbols or a different symbol size, then this can be adjusted using the
// following functions:
// kodoc_factory_set_symbols(...) and kodoc_factory_set_symbol_size(...)
// We can however not exceed the maximum values that were used when
// creating the factory.
kodoc_coder_t encoder = kodoc_factory_build_coder(encoder_factory);
kodoc_coder_t decoder = kodoc_factory_build_coder(decoder_factory);
uint32_t bytes_used;
uint32_t payload_size = kodoc_payload_size(encoder);
uint8_t* payload = (uint8_t*) malloc(payload_size);
uint32_t block_size = kodoc_block_size(encoder);
uint8_t* data_in = (uint8_t*) malloc(block_size);
uint8_t* data_out = (uint8_t*) malloc(block_size);
uint32_t i = 0;
for(; i < block_size; ++i)
data_in[i] = rand() % 256;
kodoc_set_const_symbols(encoder, data_in, block_size);
kodoc_set_mutable_symbols(decoder, data_out, block_size);
// Most of the network coding algorithms supports a mode of operation
// which is known as systematic coding. This basically means that
// initially all symbols are sent once un-coded. The rational behind this
// is that if no errors occur during the transmission we will not have
// performed any unnecessary coding operations. An encoder will exit the
// systematic phase automatically once all symbols have been sent un-coded
// once.
//
// With Kodo we can ask an encoder whether it supports systematic encoding
// or not using the following functions:
if (kodoc_is_systematic_on(encoder))
{
printf("Systematic encoding enabled\n");
}
else
{
printf("Systematic encoding disabled\n");
}
// If we do not wish to use systematic encoding, but to do full coding
// from the beginning we can turn systematic coding off using the following
// API:
//
// if (kodoc_has_set_systematic_off(encoder))
// {
// kodoc_set_systematic_off(encoder);
// }
// Install a custom trace function for the decoder
kodoc_set_trace_callback(decoder, trace_callback, NULL);
while (!kodoc_is_complete(decoder))
{
// The encoder will use a certain amount of bytes of the payload
// buffer. It will never use more than payload_size, but it might
// use less.
bytes_used = kodoc_write_payload(encoder, payload);
printf("Payload generated by encoder, rank = %d, bytes used = %d\n",
kodoc_rank(encoder), bytes_used);
// Pass the generated packet to the decoder
kodoc_read_payload(decoder, payload);
printf("Payload processed by decoder, current rank = %d\n",
kodoc_rank(decoder));
}
if (memcmp(data_in, data_out, block_size) == 0)
{
printf("Data decoded correctly\n");
}
else
{
printf("Unexpected failure to decode, please file a bug report :)\n");
}
free(data_in);
free(data_out);
free(payload);
kodoc_delete_coder(encoder);
kodoc_delete_coder(decoder);
kodoc_delete_factory(encoder_factory);
kodoc_delete_factory(decoder_factory);
return 0;
}
int main()
{
// Seed random number generator to produce different results every time
srand(time(NULL));
// Set the number of symbols (i.e. the generation size in RLNC
// terminology) and the size of a symbol in bytes
uint8_t max_symbols = 10;
uint8_t max_symbol_size = 100;
int32_t codec = kodoc_full_vector;
int32_t finite_field = kodoc_binary8;
// In the following we will make an encoder/decoder factory.
// The factories are used to build actual encoders/decoder
kodoc_factory_t encoder_factory =
kodoc_new_encoder_factory(codec, finite_field,
max_symbols, max_symbol_size);
kodoc_factory_t decoder_factory =
kodoc_new_decoder_factory(codec, finite_field,
max_symbols, max_symbol_size);
// If we wanted to build an encoder or decoder with a smaller number of
// symbols or a different symbol size, then this can be adjusted using the
// following functions:
// kodoc_factory_set_symbols(...)
// kodoc_factory_set_symbol_size(...)
// We cannot exceed the maximum values which was used when building
// the factory.
kodoc_coder_t encoder = kodoc_factory_build_coder(encoder_factory);
kodoc_coder_t decoder = kodoc_factory_build_coder(decoder_factory);
// Allocate some storage for a "payload" the payload is what we would
// eventually send over a network
uint32_t payload_size = kodoc_payload_size(encoder);
uint8_t* payload = (uint8_t*) malloc(payload_size);
// Allocate some data to encode. In this case we make a buffer
// with the same size as the encoder's block size (the max.
// amount a single encoder can encode)
uint32_t block_size = kodoc_block_size(encoder);
uint8_t* data_in = (uint8_t*) malloc(block_size);
// Just for fun - fill the data with random data
uint32_t i = 0;
for (; i < block_size; ++i)
{
data_in[i] = rand() % 256;
}
kodoc_set_const_symbols(encoder, data_in, block_size);
uint8_t* data_out = (uint8_t*) malloc(block_size);
kodoc_set_mutable_symbols(decoder, data_out, block_size);
printf("Starting encoding / decoding\n");
while (!kodoc_is_complete(decoder))
{
// If the chosen codec stack supports systematic coding
if (kodoc_has_systematic_interface(encoder))
{
// With 50% probability toggle systematic
if ((rand() % 2) == 0)
{
if (kodoc_is_systematic_on(encoder))
{
printf("Turning systematic OFF\n");
kodoc_set_systematic_off(encoder);
}
else
{
printf("Turn systematic ON\n");
kodoc_set_systematic_on(encoder);
}
}
}
// Encode a packet into the payload buffer
kodoc_write_payload(encoder, payload);
if ((rand() % 2) == 0)
{
printf("Drop packet\n");
continue;
}
// Pass that packet to the decoder
kodoc_read_payload(decoder, payload);
printf("Rank of decoder %d\n", kodoc_rank(decoder));
// Symbols that were received in the systematic phase correspond
// to the original source symbols and are therefore marked as
// decoded
printf("Symbols decoded %d\n", kodoc_symbols_uncoded(decoder));
}
if (memcmp(data_in, data_out, block_size) == 0)
{
printf("Data decoded correctly\n");
}
else
{
printf("Unexpected failure to decode, please file a bug report :)\n");
}
free(data_in);
free(payload);
kodoc_delete_coder(encoder);
kodoc_delete_coder(decoder);
kodoc_delete_factory(encoder_factory);
kodoc_delete_factory(decoder_factory);
return 0;
}
JNIEXPORT
jboolean JNICALL Java_com_steinwurf_dummy_1android_MainActivity_runKodo(
JNIEnv* env, jobject thiz)
{
// Seed random number generator to produce different results every time
srand(time(NULL));
// Set the number of symbols (i.e. the generation size in RLNC
// terminology) and the size of a symbol in bytes
uint32_t max_symbols = 42;
uint32_t max_symbol_size = 160;
// Select the coding to use
int32_t code_type = kodoc_full_vector;
// Select the finite field
int32_t finite_field = kodoc_binary;
// Create the factories
kodoc_factory_t encoder_factory =
kodoc_new_encoder_factory(code_type, finite_field,
max_symbols, max_symbol_size);
kodoc_factory_t decoder_factory =
kodoc_new_decoder_factory(code_type, finite_field,
max_symbols, max_symbol_size);
// Create the coders
kodoc_coder_t encoder = kodoc_factory_build_coder(encoder_factory);
kodoc_coder_t decoder = kodoc_factory_build_coder(decoder_factory);
// Generate the data
uint32_t payload_size = kodoc_payload_size(encoder);
uint8_t* payload = (uint8_t*) malloc(payload_size);
uint32_t block_size = kodoc_block_size(encoder);
uint8_t* data_in = (uint8_t*) malloc(block_size);
uint32_t i = 0;
for (; i < block_size; ++i)
data_in[i] = rand() % 256;
// Set the date to encode
kodoc_set_const_symbols(encoder, data_in, block_size);
uint8_t* data_out = (uint8_t*) malloc(block_size);
kodoc_set_mutable_symbols(decoder, data_out, block_size);
// Run the decoding
while (!kodoc_is_complete(decoder))
{
kodoc_write_payload(encoder, payload);
kodoc_read_payload(decoder, payload);
}
// Check if the decoding was successful
bool success = false;
if (memcmp(data_in, data_out, block_size) == 0)
success = true;
// Clean up
free(data_in);
free(data_out);
free(payload);
kodoc_delete_coder(encoder);
kodoc_delete_coder(decoder);
kodoc_delete_factory(encoder_factory);
kodoc_delete_factory(decoder_factory);
return success;
}
void test_sliding_window(uint32_t max_symbols, uint32_t max_symbol_size,
int32_t finite_field)
{
kodoc_factory_t encoder_factory = kodoc_new_encoder_factory(
kodoc_sliding_window, finite_field, max_symbols, max_symbol_size);
kodoc_factory_t decoder_factory = kodoc_new_decoder_factory(
kodoc_sliding_window, finite_field, max_symbols, max_symbol_size);
kodoc_coder_t encoder = kodoc_factory_build_coder(encoder_factory);
kodoc_coder_t decoder = kodoc_factory_build_coder(decoder_factory);
EXPECT_EQ(max_symbols,kodoc_factory_max_symbols(encoder_factory));
EXPECT_EQ(max_symbol_size,kodoc_factory_max_symbol_size(encoder_factory));
EXPECT_EQ(max_symbols, kodoc_symbols(encoder));
EXPECT_EQ(max_symbol_size,kodoc_symbol_size(encoder));
EXPECT_EQ(max_symbols, kodoc_factory_max_symbols(decoder_factory));
EXPECT_EQ(max_symbol_size, kodoc_factory_max_symbol_size(decoder_factory));
EXPECT_EQ(max_symbols, kodoc_symbols(decoder));
EXPECT_EQ(max_symbol_size, kodoc_symbol_size(decoder));
EXPECT_EQ(max_symbols * max_symbol_size, kodoc_block_size(encoder));
EXPECT_EQ(max_symbols * max_symbol_size, kodoc_block_size(decoder));
EXPECT_TRUE(kodoc_factory_max_payload_size(encoder_factory) >=
kodoc_payload_size(encoder));
EXPECT_TRUE(kodoc_factory_max_payload_size(decoder_factory) >=
kodoc_payload_size(decoder));
EXPECT_EQ(kodoc_factory_max_payload_size(encoder_factory),
kodoc_factory_max_payload_size(decoder_factory));
uint32_t feedback_size = 0;
EXPECT_EQ(kodoc_feedback_size(encoder), kodoc_feedback_size(decoder));
feedback_size = kodoc_feedback_size(encoder);
EXPECT_TRUE(feedback_size > 0);
// Allocate some storage for a "payload" the payload is what we would
// eventually send over a network
uint32_t payload_size = kodoc_payload_size(encoder);
uint8_t* payload = (uint8_t*) malloc(payload_size);
uint8_t* feedback = (uint8_t*) malloc(feedback_size);
// Allocate some data to encode. In this case we make a buffer
// with the same size as the encoder's block size (the max.
// amount a single encoder can encode)
uint32_t block_size = kodoc_block_size(encoder);
uint8_t* data_in = (uint8_t*) malloc(block_size);
uint8_t* data_out = (uint8_t*) malloc(block_size);
// Just for fun - fill the data with random data
for (uint32_t i = 0; i < block_size; ++i)
data_in[i] = rand() % 256;
// Install a custom trace function for the encoder and decoder
kodoc_set_trace_callback(encoder, encoder_trace_callback, NULL);
kodoc_set_trace_callback(decoder, decoder_trace_callback, NULL);
// Assign the data buffer to the encoder so that we may start
// to produce encoded symbols from it
kodoc_set_const_symbols(encoder, data_in, block_size);
kodoc_set_mutable_symbols(decoder, data_out, block_size);
EXPECT_TRUE(kodoc_is_complete(decoder) == 0);
while (!kodoc_is_complete(decoder))
{
// Encode the packet into the payload buffer
uint32_t payload_used = kodoc_write_payload(encoder, payload);
EXPECT_TRUE(payload_used <= kodoc_payload_size(encoder));
// Pass that packet to the decoder
kodoc_read_payload(decoder, payload);
// All payloads must be innovative due to the perfect feedback
EXPECT_TRUE(kodoc_is_partially_complete(decoder) != 0);
kodoc_write_feedback(decoder, feedback);
kodoc_read_feedback(encoder, feedback);
}
EXPECT_TRUE(kodoc_is_complete(decoder) != 0);
// Check if we properly decoded the data
EXPECT_EQ(memcmp(data_in, data_out, block_size), 0);
// Check that the trace functions were called at least once
EXPECT_GT(encoder_trace_called, 0U);
EXPECT_GT(decoder_trace_called, 0U);
free(data_in);
free(data_out);
free(payload);
free(feedback);
kodoc_delete_coder(encoder);
kodoc_delete_coder(decoder);
kodoc_delete_factory(encoder_factory);
kodoc_delete_factory(decoder_factory);
}
int main()
{
// Seed random number generator to produce different results every time
srand(time(NULL));
// Set the number of symbols (i.e. the generation size in RLNC
// terminology) and the size of a symbol in bytes
uint32_t max_symbols = 3;
uint32_t max_symbol_size = 16;
int32_t codec = kodoc_full_vector;
int32_t finite_field = kodoc_binary8;
// In the following we will make an encoder/decoder factory.
// The factories are used to build actual encoders/decoder
kodoc_factory_t encoder_factory =
kodoc_new_encoder_factory(codec, finite_field,
max_symbols, max_symbol_size);
kodoc_factory_t decoder_factory =
kodoc_new_decoder_factory(codec, finite_field,
max_symbols, max_symbol_size);
// If we wanted to build an encoder or decoder with a smaller number of
// symbols or a different symbol size, then this can be adjusted using the
// following functions:
// kodoc_factory_set_symbols(...)
// kodoc_factory_set_symbol_size(...)
// We cannot exceed the maximum values which was used when building
// the factory.
kodoc_coder_t encoder = kodoc_factory_build_coder(encoder_factory);
kodoc_coder_t decoder = kodoc_factory_build_coder(decoder_factory);
// Allocate some storage for a "payload" the payload is what we would
// eventually send over a network
uint32_t payload_size = kodoc_payload_size(encoder);
uint8_t* payload = (uint8_t*) malloc(payload_size);
// Allocate some data to encode. In this case we make a buffer
// with the same size as the encoder's block size (the max.
// amount a single encoder can encode)
uint32_t block_size = kodoc_block_size(encoder);
uint8_t* data_in = (uint8_t*) malloc(block_size);
// Just for fun - fill the data with random data
uint32_t i = 0;
for (; i < block_size; ++i)
{
data_in[i] = rand() % 256;
}
// Install the stdout trace function for the encoder (everything will
// be printed to stdout without filtering)
kodoc_set_trace_stdout(encoder);
// Set a custom zone prefix for the encoder (this helps to differentiate
// the trace output of the encoder and the decoder)
kodoc_set_zone_prefix(encoder, "Encoder");
// Install a custom trace function for the decoder (we can process and
// filter the data in our trace callback)
kodoc_set_trace_callback(decoder, trace_callback, NULL);
// Set a custom zone prefix for the decoder
kodoc_set_zone_prefix(decoder, "Decoder");
kodoc_set_const_symbols(encoder, data_in, block_size);
uint8_t* data_out = (uint8_t*) malloc(block_size);
kodoc_set_mutable_symbols(decoder, data_out, block_size);
while (!kodoc_is_complete(decoder))
{
kodoc_write_payload(encoder, payload);
if ((rand() % 2) == 0)
{
continue;
}
kodoc_read_payload(decoder, payload);
}
if (memcmp(data_in, data_out, block_size) == 0)
{
printf("Data decoded correctly\n");
}
else
{
printf("Unexpected failure to decode, please file a bug report :)\n");
}
free(data_in);
free(data_out);
free(payload);
kodoc_delete_coder(encoder);
kodoc_delete_coder(decoder);
kodoc_delete_factory(encoder_factory);
kodoc_delete_factory(decoder_factory);
return 0;
}
int main()
{
// Seed the random number generator to produce different data every time
srand(time(NULL));
// Set the number of symbols and the symbol size
uint32_t max_symbols = 10;
uint32_t max_symbol_size = 100;
// Here we select the codec we wish to use
int32_t codec = kodoc_perpetual;
// Here we select the finite field to use.
// kodoc_binary8 is common choice for the perpetual codec
int32_t finite_field = kodoc_binary8;
// First, we create an encoder & decoder factory.
// The factories are used to build actual encoders/decoders
kodoc_factory_t encoder_factory =
kodoc_new_encoder_factory(codec, finite_field,
max_symbols, max_symbol_size);
kodoc_factory_t decoder_factory =
kodoc_new_decoder_factory(codec, finite_field,
max_symbols, max_symbol_size);
kodoc_coder_t encoder = kodoc_factory_build_coder(encoder_factory);
kodoc_coder_t decoder = kodoc_factory_build_coder(decoder_factory);
// The perpetual encoder supports three operation modes:
//
// 1) Random pivot mode (default):
// The pivot element is drawn at random
// 2) Pseudo-systematic
// Pivot elements are generated with indices 0,1,2,...,n
// After that, the pivots are drawn at random.
// 3) Pre-charging
// For the first "width" symbols, the pivot index is 0. After that,
/// the pseudo-systematic mode is used. Finally, pivots are drawn at
/// random. The resulting indices: 0(width times),1,2,...,n
//
// The operation mode is set with the following API.
// Note that if both pre-charging and pseudo-systematic is enabled,
// pre-charging takes precedence.
// Enable the pseudo-systematic operation mode - faster
kodoc_set_pseudo_systematic(encoder, 1);
// Enable the pre-charing operation mode - even faster
//kodoc_set_pre_charging(encoder, 1);
printf("Pseudo-systematic flag: %d\n", kodoc_pseudo_systematic(encoder));
printf("Pre-charging flag: %d\n", kodoc_pre_charging(encoder));
// The width of the perpetual code can be set either as a number of symbols
// using kodoc_set_width(), or as a ratio of the number of symbols using
// kodoc_set_width_ratio().
//
// The default width is set to 10% of the number of symbols.
printf("The width ratio defaults to: %0.2f"
" (therefore the calculated width is %d)\n",
kodoc_width_ratio(encoder), kodoc_width(encoder));
/// When modifying the width, the width ratio will change as well
kodoc_set_width(encoder, 4);
printf("The width was set to: %d "
" (therefore the calculated width ratio is %0.2f)\n",
kodoc_width(encoder), kodoc_width_ratio(encoder));
/// When modifying the width ratio, the width will change as well
kodoc_set_width_ratio(encoder, 0.2);
printf("The width ratio was set to: %0.2f"
" (therefore the calculated width is %d)\n",
kodoc_width_ratio(encoder), kodoc_width(encoder));
// Allocate some storage for a "payload". The payload is what we would
// eventually send over a network.
uint32_t bytes_used;
uint32_t payload_size = kodoc_payload_size(encoder);
uint8_t* payload = (uint8_t*) malloc(payload_size);
// Allocate input and output data buffers
uint32_t block_size = kodoc_block_size(encoder);
uint8_t* data_in = (uint8_t*) malloc(block_size);
uint8_t* data_out = (uint8_t*) malloc(block_size);
// Fill the input buffer with random data
uint32_t i = 0;
for (; i < block_size; ++i)
data_in[i] = rand() % 256;
// Assign the data buffers to the encoder and decoder
kodoc_set_const_symbols(encoder, data_in, block_size);
kodoc_set_mutable_symbols(decoder, data_out, block_size);
// Install a custom trace function for the decoder
kodoc_set_trace_callback(decoder, trace_callback, NULL);
uint32_t lost_payloads = 0;
uint32_t received_payloads = 0;
while (!kodoc_is_complete(decoder))
{
// The encoder will use a certain amount of bytes of the payload buffer
bytes_used = kodoc_write_payload(encoder, payload);
printf("Payload generated by encoder, bytes used = %d\n", bytes_used);
// Simulate a channel with a 50% loss rate
if (rand() % 2)
{
lost_payloads++;
printf("Symbol lost on channel\n\n");
continue;
}
// Pass the generated packet to the decoder
received_payloads++;
kodoc_read_payload(decoder, payload);
printf("Payload processed by decoder, current rank = %d\n\n",
kodoc_rank(decoder));
}
printf("Number of lost payloads: %d\n", lost_payloads);
printf("Number of received payloads: %d\n", received_payloads);
// Check that we properly decoded the data
if (memcmp(data_in, data_out, block_size) == 0)
{
printf("Data decoded correctly\n");
}
else
{
printf("Unexpected failure to decode, please file a bug report :)\n");
}
// Free the allocated buffers and the kodo objects
free(data_in);
free(data_out);
free(payload);
kodoc_delete_coder(encoder);
kodoc_delete_coder(decoder);
kodoc_delete_factory(encoder_factory);
kodoc_delete_factory(decoder_factory);
return 0;
}
int main()
{
// Seed the random number generator to produce different data every time
srand(time(NULL));
// Set the number of symbols and the symbol size
uint32_t max_symbols = 10;
uint32_t max_symbol_size = 100;
// Here we select the codec we wish to use
int32_t codec = kodoc_sparse_seed;
// Here we select the finite field to use.
// For the sparse seed codec, we can choose kodoc_binary, kodoc_binary4 or
// kodoc_binary8 (kodoc_binary is recommended for high performance)
int32_t finite_field = kodoc_binary8;
kodoc_factory_t encoder_factory =
kodoc_new_encoder_factory(codec, finite_field,
max_symbols, max_symbol_size);
kodoc_factory_t decoder_factory =
kodoc_new_decoder_factory(codec, finite_field,
max_symbols, max_symbol_size);
kodoc_coder_t encoder = kodoc_factory_build_coder(encoder_factory);
kodoc_coder_t decoder = kodoc_factory_build_coder(decoder_factory);
// The coding vector density on the encoder is set with
// kodoc_set_density().
// Note: the density can be adjusted at any time. This feature can be used
// to adapt to changing network conditions.
printf("The density defaults to: %0.2f\n", kodoc_density(encoder));
kodoc_set_density(encoder, 0.4);
printf("The density was set to: %0.2f\n", kodoc_density(encoder));
// A low density setting can lead to a large number of redundant symbols.
// In practice, the value should be tuned to the specific scenario.
// Allocate some storage for a "payload". The payload is what we would
// eventually send over a network.
uint32_t bytes_used;
uint32_t payload_size = kodoc_payload_size(encoder);
uint8_t* payload = (uint8_t*) malloc(payload_size);
// Allocate input and output data buffers
uint32_t block_size = kodoc_block_size(encoder);
uint8_t* data_in = (uint8_t*) malloc(block_size);
uint8_t* data_out = (uint8_t*) malloc(block_size);
// Fill the input buffer with random data
uint32_t i = 0;
for(; i < block_size; ++i)
data_in[i] = rand() % 256;
// Assign the data buffers to the encoder and decoder
kodoc_set_const_symbols(encoder, data_in, block_size);
kodoc_set_mutable_symbols(decoder, data_out, block_size);
// Install a custom trace function for the decoder
kodoc_set_trace_callback(decoder, trace_callback, NULL);
uint32_t lost_payloads = 0;
uint32_t received_payloads = 0;
while (!kodoc_is_complete(decoder))
{
// The encoder will use a certain amount of bytes of the payload buffer
bytes_used = kodoc_write_payload(encoder, payload);
printf("Payload generated by encoder, bytes used = %d\n", bytes_used);
// Simulate a channel with a 50% loss rate
if (rand() % 2)
{
lost_payloads++;
printf("Symbol lost on channel\n\n");
continue;
}
// Pass the generated packet to the decoder
received_payloads++;
kodoc_read_payload(decoder, payload);
printf("Payload processed by decoder, current rank = %d\n\n",
kodoc_rank(decoder));
}
printf("Number of lost payloads: %d\n", lost_payloads);
printf("Number of received payloads: %d\n", received_payloads);
// Check that we properly decoded the data
if (memcmp(data_in, data_out, block_size) == 0)
{
printf("Data decoded correctly\n");
}
else
{
printf("Unexpected failure to decode, please file a bug report :)\n");
}
// Free the allocated buffers and the kodo objects
free(data_in);
free(data_out);
free(payload);
kodoc_delete_coder(encoder);
kodoc_delete_coder(decoder);
kodoc_delete_factory(encoder_factory);
kodoc_delete_factory(decoder_factory);
return 0;
}
