From ca250bf14979d359a82d5baf11ae9587d5605594 Mon Sep 17 00:00:00 2001
From: B Stack <bgstack15@gmail.com>
Date: Tue, 17 Sep 2019 08:06:14 -0400
Subject: add upstream 10.16

---
 zen/zlib_wrap.h | 33 ++++++++++++++++-----------------
 1 file changed, 16 insertions(+), 17 deletions(-)

(limited to 'zen/zlib_wrap.h')

diff --git a/zen/zlib_wrap.h b/zen/zlib_wrap.h
index c8647baf..fbe26193 100644
--- a/zen/zlib_wrap.h
+++ b/zen/zlib_wrap.h
@@ -8,31 +8,30 @@
 #define ZLIB_WRAP_H_428597064566
 
 #include "serialize.h"
+#include "sys_error.h"
 
 
 namespace zen
 {
-class ZlibInternalError {};
-
 // 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 ZlibInternalError
+BinContainer compress(const BinContainer& 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 ZlibInternalError
+BinContainer decompress(const BinContainer& stream); //throw SysError
 
 
 class InputStreamAsGzip //convert input stream into gzip on the fly
 {
 public:
-    InputStreamAsGzip( //throw ZlibInternalError
+    InputStreamAsGzip( //throw SysError
         const std::function<size_t(void* buffer, size_t bytesToRead)>& readBlock /*throw X*/); //returning 0 signals EOF: Posix read() semantics
     ~InputStreamAsGzip();
 
-    size_t read(void* buffer, size_t bytesToRead); //throw ZlibInternalError, X; return "bytesToRead" bytes unless end of stream!
+    size_t read(void* buffer, size_t bytesToRead); //throw SysError, X; return "bytesToRead" bytes unless end of stream!
 
 private:
     class Impl;
@@ -49,13 +48,13 @@ private:
 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 ZlibInternalError
-size_t zlib_decompress(const void* src, size_t srcLen, void* trg, size_t trgLen);            //throw ZlibInternalError
+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 ZlibInternalError
+BinContainer compress(const BinContainer& stream, int level) //throw SysError
 {
     BinContainer contOut;
     if (!stream.empty()) //don't dereference iterator into empty container!
@@ -73,7 +72,7 @@ BinContainer compress(const BinContainer& stream, int level) //throw ZlibInterna
                                                         stream.size(),
                                                         &*contOut.begin() + contOut.size() - bufferEstimate,
                                                         bufferEstimate,
-                                                        level); //throw ZlibInternalError
+                                                        level); //throw SysError
         if (bytesWritten < bufferEstimate)
             contOut.resize(contOut.size() - (bufferEstimate - bytesWritten)); //caveat: unsigned arithmetics
         //caveat: physical memory consumption still *unchanged*!
@@ -83,7 +82,7 @@ BinContainer compress(const BinContainer& stream, int level) //throw ZlibInterna
 
 
 template <class BinContainer>
-BinContainer decompress(const BinContainer& stream) //throw ZlibInternalError
+BinContainer decompress(const BinContainer& stream) //throw SysError
 {
     BinContainer contOut;
     if (!stream.empty()) //don't dereference iterator into empty container!
@@ -91,30 +90,30 @@ BinContainer decompress(const BinContainer& stream) //throw ZlibInternalError
         //retrieve size of uncompressed data
         uint64_t uncompressedSize = 0; //use portable number type!
         if (stream.size() < sizeof(uncompressedSize))
-            throw ZlibInternalError();
+			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 ZlibInternalError();
+			throw SysError(L"zlib error: uncompressed size == 0");
 
         try
         {
             contOut.resize(static_cast<size_t>(uncompressedSize)); //throw std::bad_alloc
         }
-        catch (std::bad_alloc&) //most likely due to data corruption!
+        catch (const std::bad_alloc& e) //most likely due to data corruption!
         {
-            throw ZlibInternalError();
+			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 ZlibInternalError
+                                                          static_cast<size_t>(uncompressedSize)); //throw SysError
         if (bytesWritten != static_cast<size_t>(uncompressedSize))
-            throw ZlibInternalError();
+            throw SysError(L"zlib error: bytes written != uncompressed size");
     }
     return contOut;
 }
-- 
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