Class: Zstd::StreamingCompress
- Inherits:
-
Object
- Object
- Zstd::StreamingCompress
- Defined in:
- ext/zstdruby/streaming_compress.c
Constant Summary collapse
- CONTINUE =
INT2FIX(ZSTD_e_continue)
- FLUSH =
INT2FIX(ZSTD_e_flush)
- END =
INT2FIX(ZSTD_e_end)
Instance Method Summary collapse
- #<<(src) ⇒ Object
- #compress(src) ⇒ Object
- #finish ⇒ Object
- #flush ⇒ Object
- #initialize(*args) ⇒ Object constructor
Constructor Details
#initialize(*args) ⇒ Object
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# File 'ext/zstdruby/streaming_compress.c', line 71
static VALUE
rb_streaming_compress_initialize(int argc, VALUE *argv, VALUE obj)
{
VALUE compression_level_value;
rb_scan_args(argc, argv, "01", &compression_level_value);
int compression_level = convert_compression_level(compression_level_value);
struct streaming_compress_t* sc;
TypedData_Get_Struct(obj, struct streaming_compress_t, &streaming_compress_type, sc);
size_t const buffOutSize = ZSTD_CStreamOutSize();
ZSTD_CCtx* ctx = ZSTD_createCCtx();
if (ctx == NULL) {
rb_raise(rb_eRuntimeError, "%s", "ZSTD_createCCtx error");
}
ZSTD_CCtx_setParameter(ctx, ZSTD_c_compressionLevel, compression_level);
sc->ctx = ctx;
sc->buf = rb_str_new(NULL, buffOutSize);
sc->buf_size = buffOutSize;
return obj;
}
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Instance Method Details
#<<(src) ⇒ Object
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# File 'ext/zstdruby/streaming_compress.c', line 141
static VALUE
rb_streaming_compress_addstr(VALUE obj, VALUE src)
{
StringValue(src);
const char* input_data = RSTRING_PTR(src);
size_t input_size = RSTRING_LEN(src);
ZSTD_inBuffer input = { input_data, input_size, 0 };
struct streaming_compress_t* sc;
TypedData_Get_Struct(obj, struct streaming_compress_t, &streaming_compress_type, sc);
const char* output_data = RSTRING_PTR(sc->buf);
while (input.pos < input.size) {
ZSTD_outBuffer output = { (void*)output_data, sc->buf_size, 0 };
size_t const result = ZSTD_compressStream2(sc->ctx, &output, &input, ZSTD_e_continue);
if (ZSTD_isError(result)) {
rb_raise(rb_eRuntimeError, "compress error error code: %s", ZSTD_getErrorName(result));
}
}
return obj;
}
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#compress(src) ⇒ Object
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# File 'ext/zstdruby/streaming_compress.c', line 118
static VALUE
rb_streaming_compress_compress(VALUE obj, VALUE src)
{
StringValue(src);
const char* input_data = RSTRING_PTR(src);
size_t input_size = RSTRING_LEN(src);
ZSTD_inBuffer input = { input_data, input_size, 0 };
struct streaming_compress_t* sc;
TypedData_Get_Struct(obj, struct streaming_compress_t, &streaming_compress_type, sc);
const char* output_data = RSTRING_PTR(sc->buf);
VALUE result = rb_str_new(0, 0);
while (input.pos < input.size) {
ZSTD_outBuffer output = { (void*)output_data, sc->buf_size, 0 };
size_t const ret = ZSTD_compressStream2(sc->ctx, &output, &input, ZSTD_e_continue);
if (ZSTD_isError(ret)) {
rb_raise(rb_eRuntimeError, "compress error error code: %s", ZSTD_getErrorName(ret));
}
rb_str_cat(result, output.dst, output.pos);
}
return result;
}
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#finish ⇒ Object
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# File 'ext/zstdruby/streaming_compress.c', line 172
static VALUE
rb_streaming_compress_finish(VALUE obj)
{
struct streaming_compress_t* sc;
TypedData_Get_Struct(obj, struct streaming_compress_t, &streaming_compress_type, sc);
VALUE result = no_compress(sc, ZSTD_e_end);
return result;
}
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#flush ⇒ Object
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# File 'ext/zstdruby/streaming_compress.c', line 163
static VALUE
rb_streaming_compress_flush(VALUE obj)
{
struct streaming_compress_t* sc;
TypedData_Get_Struct(obj, struct streaming_compress_t, &streaming_compress_type, sc);
VALUE result = no_compress(sc, ZSTD_e_flush);
return result;
}
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