ESP32 Forum

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  // Example string to compress
    const char* originalString = "T";
    size_t originalLength = strlen(originalString) + 1; // +1 for null terminator

    // Allocate memory for compressed data
    mz_ulong compressedLength = compressBound(originalLength); // Use mz_ulong
    Serial.println("Free size:");
    Serial.println(esp_get_free_heap_size());
    Serial.println("Needed size:");
    Serial.println(compressedLength);

    unsigned char* compressedData = (unsigned char*)malloc(compressedLength);
    if (compressedData == NULL) {
        Serial.println("Failed to allocate memory for compressed data");
        return;
    }

    // Compress the string
    int status = compress(compressedData, &compressedLength, (const unsigned char*)originalString, originalLength);
    if (status != Z_OK) {
        Serial.print("Compression failed with status: ");
        Serial.println(status);
        free(compressedData);
        return;
    }

    Serial.print("Compressed length: ");
    Serial.println(compressedLength);

    // Allocate memory for decompressed data
    unsigned char* decompressedData = (unsigned char*)malloc(originalLength);
    if (decompressedData == NULL) {
        Serial.println("Failed to allocate memory for decompressed data");
        free(compressedData);
        return;
    }

    // Decompress the string
    mz_ulong decompressedLength = originalLength; // Use mz_ulong
    status = uncompress(decompressedData, &decompressedLength, compressedData, compressedLength);
    if (status != Z_OK) {
        Serial.print("Decompression failed with status: ");
        Serial.println(status);
        free(compressedData);
        free(decompressedData);
        return;
    }

    Serial.print("Decompressed length: ");
    Serial.println(decompressedLength);

    // Print the decompressed string
    Serial.print("Decompressed string: ");
    Serial.println((char*)decompressedData);

    // Free allocated memory
    free(compressedData);
    free(decompressedData);

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[env:esp32dev2]
platform = espressif32
board = nodemcu-32s

framework = arduino, espidf    
upload_port = /dev/ttyUSB1
monitor_port = /dev/ttyUSB1
monitor_speed = 115200
lib_extra_dirs = /home/alexey/Projects/DTLP/DTLP
upload_speed = 921600

; Configure flash settings
board_build.f_flash = 40000000
board_build.flash_mode = qio
board_build.flash_size = 4MB
board_build.cpu_freq = 240MHz
board_build.partitions = partitions.csv
board_build.mcu = esp32
board_build.psram = one

board_upload.flash_erase = true


; Configure events to run on core 1 (if needed, this is more for multi-core setups)
build_flags = 
    -D ARDUINO_RUNNING_CORE=1
    -Ilib/miniz
    -Ilib/heatshrink
    -DBOARD_HAS_PSRAM

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# Name,	Type,	SubType,	Offset,	Size,	Flags
nvs,	data,	nvs,	0x9000,	0x5000,	
otadata,	data,	ota,	0xe000,	0x2000,	
app0,	app,	ota_0,	0x10000,	0x140000,	
app1,	app,	ota_1,	0x150000,	0x140000,	
spiffs,	data,	spiffs,	0x290000,	0x160000,	
coredump,	data,	coredump,	0x3f0000,	0x10000,