Module: ZstdRubyNative

Defined in:
ext/zstd_ruby/zstd_ruby.c

Class Method Summary collapse

Class Method Details

.compress_file_native(input_path, output_path, level) ⇒ Boolean

Compress a file using zstd

Parameters:

  • input_path (String) —

    path to input file

  • output_path (String) —

    path to output file

  • level (Integer) —

    compression level (1-22)

Returns:

  • (Boolean) —

    true on success



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# File 'ext/zstd_ruby/zstd_ruby.c', line 19

static VALUE zstd_compress_file(VALUE self, VALUE input_path, VALUE output_path, VALUE level) {
    Check_Type(input_path, T_STRING);
    Check_Type(output_path, T_STRING);
    Check_Type(level, T_FIXNUM);

    const char *input_path_str = StringValueCStr(input_path);
    const char *output_path_str = StringValueCStr(output_path);
    int compression_level = FIX2INT(level);

    FILE *input_file = fopen(input_path_str, "rb");
    if (!input_file) {
        rb_raise(rb_eRuntimeError, "Cannot open input file: %s", input_path_str);
        return Qfalse;
    }

    FILE *output_file = fopen(output_path_str, "wb");
    if (!output_file) {
        fclose(input_file);
        rb_raise(rb_eRuntimeError, "Cannot open output file: %s", output_path_str);
        return Qfalse;
    }

    // Create compression context
    ZSTD_CCtx *cctx = ZSTD_createCCtx();
    if (!cctx) {
        fclose(input_file);
        fclose(output_file);
        rb_raise(rb_eRuntimeError, "Failed to create compression context");
        return Qfalse;
    }

    // Set compression level
    ZSTD_CCtx_setParameter(cctx, ZSTD_c_compressionLevel, compression_level);

    // Allocate buffers
    void *input_buffer = malloc(BUFFER_SIZE);
    size_t output_buffer_size = ZSTD_compressBound(BUFFER_SIZE);
    void *output_buffer = malloc(output_buffer_size);

    if (!input_buffer || !output_buffer) {
        free(input_buffer);
        free(output_buffer);
        ZSTD_freeCCtx(cctx);
        fclose(input_file);
        fclose(output_file);
        rb_raise(rb_eRuntimeError, "Memory allocation failed");
        return Qfalse;
    }

    // Read and compress file in chunks
    size_t bytes_read;

    while ((bytes_read = fread(input_buffer, 1, BUFFER_SIZE, input_file)) > 0) {
        ZSTD_inBuffer input = {input_buffer, bytes_read, 0};

        // Process all input
        while (input.pos < input.size) {
            ZSTD_outBuffer output = {output_buffer, output_buffer_size, 0};
            size_t remaining = ZSTD_compressStream2(cctx, &output, &input, ZSTD_e_continue);

            if (ZSTD_isError(remaining)) {
                free(input_buffer);
                free(output_buffer);
                ZSTD_freeCCtx(cctx);
                fclose(input_file);
                fclose(output_file);
                rb_raise(rb_eRuntimeError, "Compression failed: %s", ZSTD_getErrorName(remaining));
                return Qfalse;
            }

            fwrite(output_buffer, 1, output.pos, output_file);
        }
    }

    // Finalize the compression stream
    ZSTD_inBuffer empty_input = {NULL, 0, 0};
    int finished = 0;
    while (!finished) {
        ZSTD_outBuffer output = {output_buffer, output_buffer_size, 0};
        size_t remaining = ZSTD_compressStream2(cctx, &output, &empty_input, ZSTD_e_end);

        if (ZSTD_isError(remaining)) {
            free(input_buffer);
            free(output_buffer);
            ZSTD_freeCCtx(cctx);
            fclose(input_file);
            fclose(output_file);
            rb_raise(rb_eRuntimeError, "Compression finalization failed: %s", ZSTD_getErrorName(remaining));
            return Qfalse;
        }

        fwrite(output_buffer, 1, output.pos, output_file);
        finished = (remaining == 0);
    }

    // Cleanup
    free(input_buffer);
    free(output_buffer);
    ZSTD_freeCCtx(cctx);
    fclose(input_file);
    fclose(output_file);

    return Qtrue;
}

.decompress_file_native(input_path, output_path) ⇒ Boolean

Decompress a file using zstd

Parameters:

  • input_path (String) —

    path to compressed input file

  • output_path (String) —

    path to output file

Returns:

  • (Boolean) —

    true on success



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# File 'ext/zstd_ruby/zstd_ruby.c', line 131

static VALUE zstd_decompress_file(VALUE self, VALUE input_path, VALUE output_path) {
    Check_Type(input_path, T_STRING);
    Check_Type(output_path, T_STRING);

    const char *input_path_str = StringValueCStr(input_path);
    const char *output_path_str = StringValueCStr(output_path);

    FILE *input_file = fopen(input_path_str, "rb");
    if (!input_file) {
        rb_raise(rb_eRuntimeError, "Cannot open input file: %s", input_path_str);
        return Qfalse;
    }

    FILE *output_file = fopen(output_path_str, "wb");
    if (!output_file) {
        fclose(input_file);
        rb_raise(rb_eRuntimeError, "Cannot open output file: %s", output_path_str);
        return Qfalse;
    }

    // Create decompression context
    ZSTD_DCtx *dctx = ZSTD_createDCtx();
    if (!dctx) {
        fclose(input_file);
        fclose(output_file);
        rb_raise(rb_eRuntimeError, "Failed to create decompression context");
        return Qfalse;
    }

    // Allocate buffers
    size_t input_buffer_size = ZSTD_DStreamInSize();
    void *input_buffer = malloc(input_buffer_size);
    size_t output_buffer_size = ZSTD_DStreamOutSize();
    void *output_buffer = malloc(output_buffer_size);

    if (!input_buffer || !output_buffer) {
        free(input_buffer);
        free(output_buffer);
        ZSTD_freeDCtx(dctx);
        fclose(input_file);
        fclose(output_file);
        rb_raise(rb_eRuntimeError, "Memory allocation failed");
        return Qfalse;
    }

    // Read and decompress file
    size_t bytes_read;
    size_t last_result = 0;

    while ((bytes_read = fread(input_buffer, 1, input_buffer_size, input_file)) > 0) {
        ZSTD_inBuffer input = {input_buffer, bytes_read, 0};

        while (input.pos < input.size) {
            ZSTD_outBuffer output = {output_buffer, output_buffer_size, 0};

            size_t result = ZSTD_decompressStream(dctx, &output, &input);

            if (ZSTD_isError(result)) {
                free(input_buffer);
                free(output_buffer);
                ZSTD_freeDCtx(dctx);
                fclose(input_file);
                fclose(output_file);
                rb_raise(rb_eRuntimeError, "Decompression failed: %s", ZSTD_getErrorName(result));
                return Qfalse;
            }

            fwrite(output_buffer, 1, output.pos, output_file);
            last_result = result;
        }
    }

    // Cleanup
    free(input_buffer);
    free(output_buffer);
    ZSTD_freeDCtx(dctx);
    fclose(input_file);
    fclose(output_file);

    return Qtrue;
}