From 9c053ec1b1c7cd91ca6c0cc6f65803cc3f114c7f Mon Sep 17 00:00:00 2001
From: Aqua-sama <aqua@iserlohn-fortress.net>
Date: Fri, 27 Mar 2020 16:58:18 +0200
Subject: Add namespace to format

rcc:
    - add -n/--namespace to command line
    - make default compression None
    - fix None compression not printing hexdumps

libembed:
    - add a zstd decompression test
---
 lib/embed.cpp | 67 +++++++----------------------------------------------------
 1 file changed, 7 insertions(+), 60 deletions(-)

(limited to 'lib/embed.cpp')

diff --git a/lib/embed.cpp b/lib/embed.cpp
index c3b0286..07af38f 100644
--- a/lib/embed.cpp
+++ b/lib/embed.cpp
@@ -1,70 +1,17 @@
-/*
- * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under both the BSD-style license (found in the
- * LICENSE file in the root directory of this source tree) and the GPLv2 (found
- * in the COPYING file in the root directory of this source tree).
- * You may select, at your option, one of the above-listed licenses.
- */
-
 #include "embed.h"
-#include <zstd.h>      // presumes zstd library is installed
-#include <cassert>
 
 using namespace embed;
 
-ZSTD_DDict* dictPtr = nullptr;
-
-Resources::Resources(const ResourceData &info)
-    : m_info(info)
+template <>
+Resources<Compression::None>::Resources(const std::span<const unsigned char> &)
 {
-    if(!info.dictionary.empty()) {
-        dictPtr = ZSTD_createDDict(info.dictionary.data(), info.dictionary.size());
-    }
 }
 
-Resources::~Resources()
-{
-    if(dictPtr != nullptr) {
-        ZSTD_freeDDict(dictPtr);
-    }
-}
+template <>
+Resources<Compression::None>::~Resources() = default;
 
-[[nodiscard]] std::span<unsigned char> Resources::decompress(const std::span<const unsigned char> &entry)
+template <>
+[[nodiscard]] std::vector<unsigned char> Resources<Compression::None>::decompress(const std::span<const unsigned char> &entry)
 {
-    /* Read the content size from the frame header. For simplicity we require
-     * that it is always present. By default, zstd will write the content size
-     * in the header when it is known. If you can't guarantee that the frame
-     * content size is always written into the header, either use streaming
-     * decompression, or ZSTD_decompressBound().
-     */
-    unsigned long long const rSize = ZSTD_getFrameContentSize(entry.data(), entry.size());
-    assert(rSize != ZSTD_CONTENTSIZE_ERROR); //, "%s: not compressed by zstd!", fname);
-    assert(rSize != ZSTD_CONTENTSIZE_UNKNOWN); //, "%s: original size unknown!", fname);
-    auto* rBuff = new unsigned char[(size_t) rSize];
-
-    /* Check that the dictionary ID matches.
-     * If a non-zstd dictionary is used, then both will be zero.
-     * By default zstd always writes the dictionary ID into the frame.
-     * Zstd will check if there is a dictionary ID mismatch as well.
-     */
-    unsigned const expectedDictID = ZSTD_getDictID_fromDDict(dictPtr);
-    unsigned const actualDictID = ZSTD_getDictID_fromFrame(entry.data(), entry.size());
-    assert(actualDictID == expectedDictID); //"DictID mismatch: expected %u got %u",
-
-    /* Decompress using the dictionary.
-     * If you need to control the decompression parameters, then use the
-     * advanced API: ZSTD_DCtx_setParameter(), ZSTD_DCtx_refDDict(), and
-     * ZSTD_decompressDCtx().
-     */
-    ZSTD_DCtx* const dctx = ZSTD_createDCtx();
-    assert(dctx != NULL); //, "ZSTD_createDCtx() failed!");
-    size_t const dSize = ZSTD_decompress_usingDDict(dctx, rBuff, rSize, entry.data(), entry.size(), dictPtr);
-    /* When zstd knows the content size, it will error if it doesn't match. */
-    assert(dSize == rSize); //, "Impossible because zstd will check this condition!");
-
-    ZSTD_freeDCtx(dctx);
-    return std::span(rBuff, rSize);
+    return { entry.begin(), entry.end() };
 }
-
-- 
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