Provide our own htmlhelp library codexlaunch-20130806-1

- libhtmlhelp.a we now provide ourself
- htmlhelp.h comes from MinGW-w64 w32api
- hhc.exe comes from the HTML Help Workshop

We need to do this because:
- w32api doesn't provde a libhtmlhelp.a, and we don't know where to get one for
x86_64 that is actually useful
- maybe there are some license issue with linking with htlphelp.lib from a
Microsoft PSDK and the cygwin DLL?

3 files changed, 111 insertions, 0 deletions

diff --git a/lib/Makefile.am b/lib/Makefile.am
new file mode 100644
index 0000000..b74f086
--- /dev/null
+++ b/lib/Makefile.am
@@ -0,0 +1,4 @@
+
+noinst_LIBRARIES = libhtmlhelp.a
+
+libhtmlhelp_a_SOURCES = init.c
diff --git a/lib/init.c b/lib/init.c
new file mode 100644
index 0000000..6343e91
--- /dev/null
+++ b/lib/init.c
@@ -0,0 +1,83 @@
+/*
+  Copied from https://github.com/yumeyao/7zip
+  "building 7zip using vc8(x86) and vc11(x64) while still linking to msvcrt.dll"
+
+  To the best of my knowledge this file is licensed under the LGPL.
+
+  PSDK versions of htmlhelp.lib for x86_64 depend on bufferoverflowU.lib for __security_cookie,
+  since they are compiled with VC using the /GS flag
+
+  This also improves on the x86 library in previous SDK, since it adds functionality to expand
+  REG_EXPAND_SZ to a full path.
+*/
+
+#include <windows.h>
+
+static HMODULE g_hmodHHCtrl = NULL;
+static BOOL g_fTriedAndFailed = FALSE;
+typedef HWND (WINAPI *pHtmlHelpA_t)(HWND hwndCaller, LPCSTR pszFile, UINT uCommand, DWORD_PTR dwData);
+typedef HWND (WINAPI *pHtmlHelpW_t)(HWND hwndCaller, LPCWSTR pszFile, UINT uCommand, DWORD_PTR dwData);
+pHtmlHelpA_t pHtmlHelpA = NULL;
+pHtmlHelpW_t pHtmlHelpW = NULL;
+#define HtmlHelpAHint 14
+#define HtmlHelpWHint 15
+
+__attribute__((always_inline)) static LPSTR GetRegisteredLocation(LPSTR pszPath, LPSTR pszExpandedPath)
+{
+	LPSTR ret = NULL;
+	HKEY hKey;
+	DWORD cbData;
+	DWORD dwType;
+	if (ERROR_SUCCESS != RegOpenKeyExA(
+			HKEY_CLASSES_ROOT,
+			"CLSID\\{ADB880A6-D8FF-11CF-9377-00AA003B7A11}\\InprocServer32",
+			0, KEY_READ, &hKey))
+		return ret;
+	cbData = MAX_PATH;
+	if (ERROR_SUCCESS == RegQueryValueExA(hKey, NULL, NULL, &dwType, (LPBYTE)pszPath, &cbData)) {
+		if (REG_EXPAND_SZ==dwType) {
+			if (MAX_PATH == ExpandEnvironmentStringsA(pszPath, pszExpandedPath, MAX_PATH)) {
+				ret = pszExpandedPath;
+			}
+		} else {
+			ret = pszPath;
+		}
+	}
+	RegCloseKey(hKey);
+	return ret;
+}
+
+__declspec(noinline) static HMODULE WINAPI TryLoadingModule()
+{
+	CHAR szPath[MAX_PATH];
+	CHAR szExpandedPath[MAX_PATH];
+	HMODULE hMod;
+	CHAR *pszPath;
+
+	if (pszPath = GetRegisteredLocation(szPath, szExpandedPath)) {
+		hMod = LoadLibraryA(pszPath);
+		if (!hMod)
+			goto LoadDefaultPath;
+	} else {
+LoadDefaultPath:
+		hMod = LoadLibraryA("hhctrl.ocx");
+	}
+	return hMod;
+}
+
+#define _mkFuncPtr(FuncName) p##FuncName
+#define _mkFuncPtrType(FuncName) p##FuncName##_t
+#define _mkFuncHint(FuncName) FuncName##Hint
+#define mkFuncPtr(FuncName) _mkFuncPtr(FuncName)
+#define mkFuncPtrType(FuncName) _mkFuncPtrType(FuncName)
+#define mkFuncHint(FuncName) _mkFuncHint(FuncName)
+
+#define FuncName HtmlHelpA
+#define StrType LPCSTR
+#include "sub.c"
+
+#undef FuncName
+#undef StrType
+#define FuncName HtmlHelpW
+#define StrType LPCWSTR
+#include "sub.c"
diff --git a/lib/sub.c b/lib/sub.c
new file mode 100644
index 0000000..352da94
--- /dev/null
+++ b/lib/sub.c
@@ -0,0 +1,24 @@
+
+HWND WINAPI FuncName(HWND hwndCaller, StrType pszFile, UINT uCommand, DWORD_PTR dwData)
+{
+	HMODULE hMod = g_hmodHHCtrl;
+	mkFuncPtrType(FuncName) pFunc;
+	if (!hMod && g_fTriedAndFailed == FALSE) {
+		if (hMod = TryLoadingModule())
+			g_hmodHHCtrl = hMod;
+		else
+			goto Fail;
+	}
+
+	pFunc = mkFuncPtr(FuncName);
+	if (pFunc) goto CallFunc;
+	if (pFunc = (mkFuncPtrType(FuncName))GetProcAddress(g_hmodHHCtrl, (LPCSTR)mkFuncHint(FuncName))) {
+		mkFuncPtr(FuncName) = pFunc;
+CallFunc:
+		return pFunc((HWND)hwndCaller, pszFile, uCommand, dwData);
+	}
+
+Fail:
+	g_fTriedAndFailed = ~FALSE;
+	return NULL;
+}