From cab22f2dc3c5f41b5163f74cbb233e390edff6ff Mon Sep 17 00:00:00 2001
From: "B. Stack" <bgstack15@gmail.com>
Date: Tue, 11 Oct 2022 11:16:39 -0400
Subject: add upstream 11.26

---
 zen/zlib_wrap.h | 94 +++++----------------------------------------------------
 1 file changed, 8 insertions(+), 86 deletions(-)

(limited to 'zen/zlib_wrap.h')

diff --git a/zen/zlib_wrap.h b/zen/zlib_wrap.h
index 41d7428a..d672707b 100644
--- a/zen/zlib_wrap.h
+++ b/zen/zlib_wrap.h
@@ -7,7 +7,7 @@
 #ifndef ZLIB_WRAP_H_428597064566
 #define ZLIB_WRAP_H_428597064566
 
-#include "serialize.h"
+#include <functional>
 #include "sys_error.h"
 
 
@@ -16,21 +16,21 @@ namespace zen
 // compression level must be between 0 and 9:
 // 0: no compression
 // 9: best compression
-template <class BinContainer> //as specified in serialize.h
-BinContainer compress(const BinContainer& stream, int level); //throw SysError
+std::string compress(const std::string_view& stream, int level); //throw SysError
 //caveat: output stream is physically larger than input! => strip additional reserved space if needed: "BinContainer(output.begin(), output.end())"
 
-template <class BinContainer>
-BinContainer decompress(const BinContainer& stream); //throw SysError
+std::string decompress(const std::string_view& stream); //throw SysError
 
 
 class InputStreamAsGzip //convert input stream into gzip on the fly
 {
 public:
-    explicit InputStreamAsGzip( //throw SysError
-        const std::function<size_t(void* buffer, size_t bytesToRead)>& readBlock /*throw X;  returning 0 signals EOF: Posix read() semantics*/);
+    explicit InputStreamAsGzip(const std::function<size_t(void* buffer, size_t bytesToRead)>& tryReadBlock /*throw X; may return short, only 0 means EOF!*/,
+                               size_t blockSize); //throw SysError
     ~InputStreamAsGzip();
 
+    size_t getBlockSize() const;
+
     size_t read(void* buffer, size_t bytesToRead); //throw SysError, X; return "bytesToRead" bytes unless end of stream!
 
 private:
@@ -38,85 +38,7 @@ private:
     const std::unique_ptr<Impl> pimpl_;
 };
 
-std::string compressAsGzip(const void* buffer, size_t bufSize); //throw SysError
-
-
-
-
-
-
-//######################## implementation ##########################
-namespace impl
-{
-size_t zlib_compressBound(size_t len);
-size_t zlib_compress  (const void* src, size_t srcLen, void* trg, size_t trgLen, int level); //throw SysError
-size_t zlib_decompress(const void* src, size_t srcLen, void* trg, size_t trgLen);            //throw SysError
-}
-
-
-template <class BinContainer>
-BinContainer compress(const BinContainer& stream, int level) //throw SysError
-{
-    BinContainer contOut;
-    if (!stream.empty()) //don't dereference iterator into empty container!
-    {
-        //save uncompressed stream size for decompression
-        const uint64_t uncompressedSize = stream.size(); //use portable number type!
-        contOut.resize(sizeof(uncompressedSize));
-        std::memcpy(&contOut[0], &uncompressedSize, sizeof(uncompressedSize));
-
-        const size_t bufferEstimate = impl::zlib_compressBound(stream.size()); //upper limit for buffer size, larger than input size!!!
-
-        contOut.resize(contOut.size() + bufferEstimate);
-
-        const size_t bytesWritten = impl::zlib_compress(&*stream.begin(),
-                                                        stream.size(),
-                                                        &*contOut.begin() + contOut.size() - bufferEstimate,
-                                                        bufferEstimate,
-                                                        level); //throw SysError
-        if (bytesWritten < bufferEstimate)
-            contOut.resize(contOut.size() - (bufferEstimate - bytesWritten)); //caveat: unsigned arithmetics
-        //caveat: physical memory consumption still *unchanged*!
-    }
-    return contOut;
-}
-
-
-template <class BinContainer>
-BinContainer decompress(const BinContainer& stream) //throw SysError
-{
-    BinContainer contOut;
-    if (!stream.empty()) //don't dereference iterator into empty container!
-    {
-        //retrieve size of uncompressed data
-        uint64_t uncompressedSize = 0; //use portable number type!
-        if (stream.size() < sizeof(uncompressedSize))
-            throw SysError(L"zlib error: stream size < 8");
-
-        std::memcpy(&uncompressedSize, &*stream.begin(), sizeof(uncompressedSize));
-
-        //attention: contOut MUST NOT be empty! Else it will pass a nullptr to zlib_decompress() => Z_STREAM_ERROR although "uncompressedSize == 0"!!!
-        //secondary bug: don't dereference iterator into empty container!
-        if (uncompressedSize == 0) //cannot be 0: compress() directly maps empty -> empty container skipping zlib!
-            throw SysError(L"zlib error: uncompressed size == 0");
-
-        try
-        {
-            contOut.resize(static_cast<size_t>(uncompressedSize)); //throw std::bad_alloc
-        }
-        //most likely this is due to data corruption:
-        catch (const std::length_error& e) { throw SysError(L"zlib error: " + _("Out of memory.") + L' ' + utfTo<std::wstring>(e.what())); }
-        catch (const    std::bad_alloc& e) { throw SysError(L"zlib error: " + _("Out of memory.") + L' ' + utfTo<std::wstring>(e.what())); }
-
-        const size_t bytesWritten = impl::zlib_decompress(&*stream.begin() + sizeof(uncompressedSize),
-                                                          stream.size() - sizeof(uncompressedSize),
-                                                          &*contOut.begin(),
-                                                          static_cast<size_t>(uncompressedSize)); //throw SysError
-        if (bytesWritten != static_cast<size_t>(uncompressedSize))
-            throw SysError(formatSystemError("zlib_decompress", L"", L"bytes written != uncompressed size."));
-    }
-    return contOut;
-}
+std::string compressAsGzip(const std::string_view& stream); //throw SysError
 }
 
 #endif //ZLIB_WRAP_H_428597064566
-- 
cgit