Class: Zstd::StreamEncoder

Inherits:
Object
  • Object
show all
Defined in:
ext/extzstd_stream.c

Constant Summary collapse

INSIZE = 
SIZET2NUM(ZSTD_CStreamInSize())
OUTSIZE = 
SIZET2NUM(ZSTD_CStreamOutSize())

Instance Method Summary collapse

Constructor Details

#initialize(compression_parameters, predict) ⇒ Object 



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# File 'ext/extzstd_stream.c', line 45

static VALUE
enc_init(VALUE self, VALUE params, VALUE predict)
{
    /*
     * ZSTDLIB_API size_t ZSTD_initCStream(ZSTD_CStream* zcs, int compressionLevel);
     * ZSTDLIB_API size_t ZSTD_initCStream_usingDict(ZSTD_CStream* zcs, const void* dict, size_t dictSize, int compressionLevel);
     * ZSTDLIB_API size_t ZSTD_initCStream_advanced(ZSTD_CStream* zcs, const void* dict, size_t dictSize,
     *                                              ZSTD_parameters params, unsigned long long pledgedSrcSize);
     */

    ZSTD_CStream *p = getencoder(self);
    const void *predictp;
    size_t predictsize;
    if (NIL_P(predict)) {
        predictp = NULL;
        predictsize = 0;
    } else {
        rb_check_type(predict, RUBY_T_STRING);
        RSTRING_GETMEM(predict, predictp, predictsize);
    }

    if (extzstd_params_p(params)) {
        ZSTD_parameters *paramsp = extzstd_getparams(params);
        size_t s = ZSTD_initCStream_advanced(p, predictp, predictsize, *paramsp, 0);
        extzstd_check_error(s);
    } else {
        size_t s = ZSTD_initCStream_usingDict(p, predictp, predictsize, aux_num2int(params, 1));
        extzstd_check_error(s);
    }
    return self;
}

Instance Method Details

#end(dest, maxdest) ⇒ Object 



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# File 'ext/extzstd_stream.c', line 142

static VALUE
enc_end(VALUE self, VALUE dest, VALUE maxdest)
{
    /*
     * ZSTDLIB_API size_t ZSTD_endStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output);
     */

    ZSTD_CStream *p = getencoder(self);
    rb_check_type(dest, RUBY_T_STRING);
    rb_str_modify(dest);
    rb_str_set_len(dest, 0);
    rb_str_modify_expand(dest, NUM2SIZET(maxdest));

    ZSTD_outBuffer output = { RSTRING_PTR(dest), rb_str_capacity(dest), 0 };
    size_t s = ZSTD_endStream(p, &output);
    extzstd_check_error(s);
    if (output.size > 0) {
        rb_str_set_len(dest, output.pos);
        return dest;
    } else {
        return Qnil;
    }
}

#flush(dest, maxdest) ⇒ Object 



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# File 'ext/extzstd_stream.c', line 117

static VALUE
enc_flush(VALUE self, VALUE dest, VALUE maxdest)
{
    /*
     * ZSTDLIB_API size_t ZSTD_flushStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output);
     */

    ZSTD_CStream *p = getencoder(self);

    rb_check_type(dest, RUBY_T_STRING);
    rb_str_modify(dest);
    rb_str_set_len(dest, 0);
    rb_str_modify_expand(dest, NUM2SIZET(maxdest));

    ZSTD_outBuffer output = { RSTRING_PTR(dest), rb_str_capacity(dest), 0 };
    size_t s = ZSTD_flushStream(p, &output);
    extzstd_check_error(s);
    if (output.size > 0) {
        rb_str_set_len(dest, output.pos);
        return dest;
    } else {
        return Qnil;
    }
}

#reset(pledged_srcsize) ⇒ Object 



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# File 'ext/extzstd_stream.c', line 166

static VALUE
enc_reset(VALUE self, VALUE pledged_srcsize)
{
    /*
     * ZSTDLIB_API size_t ZSTD_resetCStream(ZSTD_CStream* zcs, unsigned long long pledgedSrcSize);
     */

    size_t s = ZSTD_resetCStream(getencoder(self), NUM2ULL(pledged_srcsize));
    extzstd_check_error(s);
    return self;
}

#sizeof ⇒ Object 



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# File 'ext/extzstd_stream.c', line 178

static VALUE
enc_sizeof(VALUE self)
{
    /*
     * ZSTDLIB_API size_t ZSTD_sizeof_CStream(const ZSTD_CStream* zcs);
     */

    size_t s = ZSTD_sizeof_CStream(getencoder(self));
    extzstd_check_error(s);
    return SIZET2NUM(s);
}

#update(src, srcoff, dest, maxdest) ⇒ Object 



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# File 'ext/extzstd_stream.c', line 77

static VALUE
enc_update(VALUE self, VALUE src, VALUE srcoff, VALUE dest, VALUE maxdest)
{
    /*
     * ZSTDLIB_API size_t ZSTD_compressStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output, ZSTD_inBuffer* input);
     */

    ZSTD_CStream *p = getencoder(self);

    rb_check_type(src, RUBY_T_STRING);
    const char *q = RSTRING_PTR(src);
    const char *qq = RSTRING_END(src);
    const char *q1 = q + NUM2SIZET(srcoff);
    if (q1 < q || q1 > qq) {
        rb_raise(rb_eArgError,
                "``srcoff'' is out of range (given %"PRIuSIZE", expect 0..%"PRIuSIZE")",
                q1 - q, qq - q);
    }

    rb_check_type(dest, RUBY_T_STRING);
    rb_str_modify(dest);
    rb_str_set_len(dest, 0);
    rb_str_modify_expand(dest, NUM2SIZET(maxdest));
    rb_obj_infect(self, src);
    rb_obj_infect(dest, self);
    char *r = RSTRING_PTR(dest);
    const char *rr = r + rb_str_capacity(dest);

    ZSTD_inBuffer input = { q, qq - q, q1 - q };
    ZSTD_outBuffer output = { r, rr - r, 0 };
    size_t s = ZSTD_compressStream(p, &output, &input);
    extzstd_check_error(s);
    rb_str_set_len(dest, output.pos);
    if (input.pos == input.size) {
        return Qnil;
    } else {
        return SIZET2NUM(input.pos);
    }
}