Class: Zstd

Inherits:
Object
  • Object
show all
Defined in:
lib/zstd.rb,
lib/zstd/version.rb,
ext/zstd/zstd.c

Constant Summary collapse

VERSION = 
"1.1.2.1"

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Object 



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# File 'ext/zstd/zstd.c', line 154

static VALUE initialize(int argc, VALUE *argv, VALUE self) {
  VALUE dic_arg;
  struct dic_struct *ds;
  Data_Get_Struct(self, struct dic_struct, ds);
  ds->cdic = NULL;
  ds->cctx = NULL;
  ds->ddic = NULL;
  ds->dctx = NULL;
  
  rb_scan_args(argc, argv, "01", &dic_arg);

  if (!NIL_P(dic_arg)) {
    Check_Type(dic_arg, RUBY_T_STRING);    
    const char* dic_ptr = RSTRING_PTR(dic_arg);
    ds->cdic = createCDict_or_raise(dic_ptr, 19);
    ds->cctx = ZSTD_createCCtx();
    ds->ddic = createDDict_or_raise(dic_ptr);
    ds->dctx = ZSTD_createDCtx();
  }

  return self;
}

Instance Method Details

#compress(*args) ⇒ Object 



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# File 'ext/zstd/zstd.c', line 63

static VALUE compress(int argc, VALUE *argv, VALUE self) {
  VALUE src_buf, dst_buf, comp_level_arg;
  const char* src_ptr;
  char* dst_ptr;
  size_t src_size, dst_size, res;
  int comp_level;

  rb_scan_args(argc, argv, "11", &src_buf, &comp_level_arg);
  
  Check_Type(src_buf, RUBY_T_STRING);
  src_ptr = RSTRING_PTR(src_buf);
  src_size = RSTRING_LEN(src_buf);
  
  dst_size = ZSTD_compressBound(src_size);
  dst_buf = rb_str_new(NULL, dst_size);
  dst_ptr = RSTRING_PTR(dst_buf);

  comp_level = 3;
  if (!NIL_P(comp_level_arg)) {
    Check_Type(comp_level_arg, RUBY_T_FIXNUM);
    comp_level = FIX2INT(comp_level_arg);    
  }

  struct dic_struct *ds;
  Data_Get_Struct(self, struct dic_struct, ds);

  if (ds->cdic == NULL) {
    res = ZSTD_compress((void*)dst_ptr, dst_size, (const void*)src_ptr, src_size, comp_level);
  } else {    
    res = ZSTD_compress_usingCDict(ds->cctx, (void*)dst_ptr, dst_size, (const void*)src_ptr, src_size, ds->cdic);
  }

  if (ZSTD_isError(res)) {
    rb_raise(rb_eRuntimeError, "error compressing: %s", ZSTD_getErrorName(res));
  } else {
    rb_str_resize(dst_buf, res);
  }

  return dst_buf;
}

#decompress(*args) ⇒ Object 



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# File 'ext/zstd/zstd.c', line 104

static VALUE decompress(int argc, VALUE *argv, VALUE self) {
  VALUE src_buf, dst_buf;
  const char* src_ptr;
  char* dst_ptr;
  size_t src_size, dst_size, res;
  
  rb_scan_args(argc, argv, "10", &src_buf);

  Check_Type(src_buf, RUBY_T_STRING);
  src_ptr = RSTRING_PTR(src_buf);
  src_size = RSTRING_LEN(src_buf);

  dst_size = ZSTD_getDecompressedSize(src_ptr, src_size);
  dst_buf = rb_str_new(NULL, dst_size);
  dst_ptr = RSTRING_PTR(dst_buf);

  struct dic_struct *ds;
  Data_Get_Struct(self, struct dic_struct, ds);

  if (ds->ddic == NULL) {
    res = ZSTD_decompress((void*)dst_ptr, dst_size, (const void*)src_ptr, src_size);
  } else {
    res = ZSTD_decompress_usingDDict(ds->dctx, (void*)dst_ptr, dst_size, (const void*)src_ptr, src_size, ds->ddic);
  }

  if (ZSTD_isError(res)) {
    rb_raise(rb_eRuntimeError, "error decompressing: %s", ZSTD_getErrorName(res));
  } else {
    rb_str_resize(dst_buf, res);
  }

  return dst_buf;  
}