Module: LZ4Native::LZ4HC

Defined in:
ext/lz4_native/lz4_native.c

Constant Summary collapse

CLEVEL_MIN = 
INT2NUM(LZ4HC_CLEVEL_MIN)
CLEVEL_DEFAULT = 
INT2NUM(LZ4HC_CLEVEL_DEFAULT)
CLEVEL_MAX = 
INT2NUM(LZ4HC_CLEVEL_MAX)

Class Method Summary collapse

Class Method Details

.compress(source, compression_level = 9) ⇒ Object

Compresses using high-compression mode. compression_level: 1-12 (default 9), higher = better compression, slower.



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# File 'ext/lz4_native/lz4_native.c', line 181

static VALUE
lz4hc_compress_wrapper(int argc, VALUE *argv, VALUE self)
{
    VALUE source, level;
    rb_scan_args(argc, argv, "11", &source, &level);

    Check_Type(source, T_STRING);
    int compression_level = NIL_P(level) ? LZ4HC_CLEVEL_DEFAULT : NUM2INT(level);

    if (compression_level < LZ4HC_CLEVEL_MIN) {
        compression_level = LZ4HC_CLEVEL_MIN;
    } else if (compression_level > LZ4HC_CLEVEL_MAX) {
        compression_level = LZ4HC_CLEVEL_MAX;
    }

    const char* src = RSTRING_PTR(source);
    int src_size = (int)RSTRING_LEN(source);

    int max_dst_size = LZ4_compressBound(src_size);
    VALUE result = rb_str_buf_new(max_dst_size);
    char* dst = RSTRING_PTR(result);

    int compressed_size = LZ4_compress_HC(src, dst, src_size, max_dst_size, compression_level);

    if (compressed_size <= 0) {
        rb_raise(eLZ4CompressionError, "HC compression failed");
    }

    rb_str_set_len(result, compressed_size);
    return result;
}

.sizeof_state ⇒ Integer

Returns the size needed for HC compression state.

Returns:

  • (Integer) 


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# File 'ext/lz4_native/lz4_native.c', line 219

static VALUE
lz4hc_sizeof_state_wrapper(VALUE self)
{
    return INT2NUM(LZ4_sizeofStateHC());
}