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Implements handling of partial frames by the streaming decompressor #88

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Implements handling of partial frames by the streaming decompressor #88

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22 changes: 22 additions & 0 deletions ext/zstdruby/streaming_decompress.c
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Original file line number Diff line number Diff line change
Expand Up @@ -113,6 +113,27 @@ rb_streaming_decompress_decompress(VALUE obj, VALUE src)
return result;
}

static VALUE
rb_streaming_decompress_decompress2(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_decompress_t* sd;
TypedData_Get_Struct(obj, struct streaming_decompress_t, &streaming_decompress_type, sd);
const char* output_data = RSTRING_PTR(sd->buf);
VALUE result = rb_str_new(0, 0);
ZSTD_outBuffer output = { (void*)output_data, sd->buf_size, 0 };
size_t const ret = zstd_stream_decompress(sd->dctx, &output, &input, false);
if (ZSTD_isError(ret)) {
rb_raise(rb_eRuntimeError, "decompress error error code: %s", ZSTD_getErrorName(ret));
}
rb_str_cat(result, output.dst, output.pos);
return rb_ary_new_from_args(3, UINT2NUM(ret), result, ULONG2NUM(input.pos));
}

extern VALUE rb_mZstd, cStreamingDecompress;
void
zstd_ruby_streaming_decompress_init(void)
Expand All @@ -121,4 +142,5 @@ zstd_ruby_streaming_decompress_init(void)
rb_define_alloc_func(cStreamingDecompress, rb_streaming_decompress_allocate);
rb_define_method(cStreamingDecompress, "initialize", rb_streaming_decompress_initialize, -1);
rb_define_method(cStreamingDecompress, "decompress", rb_streaming_decompress_decompress, 1);
rb_define_method(cStreamingDecompress, "decompress2", rb_streaming_decompress_decompress2, 1);
}