From 3986b91d0e344e11b5953657fa1fb3e85d6da869 Mon Sep 17 00:00:00 2001
From: George Hazan <george.hazan@gmail.com>
Date: Mon, 21 Dec 2015 14:26:08 +0000
Subject: hex2bin / hex2bin -> fast hex decoder from char / WCHAR to binary
 data

git-svn-id: http://svn.miranda-ng.org/main/trunk@15925 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
---
 src/mir_core/src/mir_core.def   |  2 ++
 src/mir_core/src/mir_core64.def |  2 ++
 src/mir_core/src/utils.cpp      | 50 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 54 insertions(+)

(limited to 'src')

diff --git a/src/mir_core/src/mir_core.def b/src/mir_core/src/mir_core.def
index fb89dde82b..c5ff0c1fbc 100644
--- a/src/mir_core/src/mir_core.def
+++ b/src/mir_core/src/mir_core.def
@@ -988,3 +988,5 @@ mir_sha256_hash @1145
 mir_sha256_init @1146
 mir_sha256_write @1147
 mir_forkthreadowner @1148
+hex2bin @1149
+hex2binW @1150
diff --git a/src/mir_core/src/mir_core64.def b/src/mir_core/src/mir_core64.def
index f7cb356fdb..3d660b330c 100644
--- a/src/mir_core/src/mir_core64.def
+++ b/src/mir_core/src/mir_core64.def
@@ -988,3 +988,5 @@ mir_sha256_hash @1145
 mir_sha256_init @1146
 mir_sha256_write @1147
 mir_forkthreadowner @1148
+hex2bin @1149
+hex2binW @1150
diff --git a/src/mir_core/src/utils.cpp b/src/mir_core/src/utils.cpp
index 91b057b301..a2f1ab0171 100644
--- a/src/mir_core/src/utils.cpp
+++ b/src/mir_core/src/utils.cpp
@@ -282,6 +282,56 @@ MIR_CORE_DLL(WCHAR*) bin2hexW(const void *pData, size_t len, WCHAR *dest)
 	return dest;
 }
 
+static int hex2dec(int iHex)
+{
+	if (iHex >= '0' && iHex <= '9')
+		return iHex - '0';
+	if (iHex >= 'a' && iHex <= 'f')
+		return iHex - 'a' + 10;
+	if (iHex >= 'A' && iHex <= 'F')
+		return iHex - 'A' + 10;
+	return 0;
+}
+
+MIR_CORE_DLL(bool) hex2bin(const char *pSrc, void *pData, size_t len)
+{
+	if (pSrc == NULL || pData == NULL || len == 0)
+		return false;
+
+	size_t bufLen = strlen(pSrc)/2;
+	if (pSrc[bufLen*2] != 0 || bufLen > len)
+		return false;
+
+	BYTE *pDest = (BYTE*)pData;
+	const char *p = (const char *)pSrc;
+	for (size_t i = 0; i < bufLen; i++, p += 2)
+		pDest[i] = hex2dec(p[0]) * 16 + hex2dec(p[1]);
+
+	if (bufLen < len)
+		memset(pDest + bufLen, 0, len - bufLen);
+	return true;
+}
+
+MIR_CORE_DLL(bool) hex2binW(const wchar_t *pSrc, void *pData, size_t len)
+{
+	if (pSrc == NULL || pData == NULL || len == 0)
+		return false;
+
+	size_t bufLen = wcslen(pSrc);
+	if (pSrc[bufLen * 2] != 0 || bufLen > len)
+		return false;
+
+	BYTE *pDest = (BYTE*)pData;
+	const wchar_t *p = (const wchar_t *)pSrc;
+	for (size_t i = 0; i < bufLen; i++, p += 2)
+		pDest[i] = hex2dec(p[0]) * 16 + hex2dec(p[1]);
+
+	if (bufLen < len)
+		memset(pDest+bufLen, 0, len - bufLen);
+	return true;
+}
+
+
 /////////////////////////////////////////////////////////////////////////////////////////
 
 #pragma intrinsic(strlen, strcpy, strcat, strcmp, wcslen, wcscpy, wcscat, wcscmp)
-- 
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