[PATCH vkd3d 1/2] vkd3d-shader: Import MD5 implementation from Wine.

[Józef Kucia]

From: Józef Kucia <jkucia(a)codeweavers.com>

With style changes.

Signed-off-by: Józef Kucia <jkucia(a)codeweavers.com>
---
 Makefile.am                              |   1 +
 libs/vkd3d-shader/checksum.c             | 276 +++++++++++++++++++++++
 libs/vkd3d-shader/vkd3d_shader_private.h |   6 +
 3 files changed, 283 insertions(+)
 create mode 100644 libs/vkd3d-shader/checksum.c

diff --git a/Makefile.am b/Makefile.am
index a16f7ca42ec9..7869b2ea8f62 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -70,6 +70,7 @@ libvkd3d_shader_la_SOURCES = \
 	include/private/vkd3d_debug.h \
 	include/private/vkd3d_memory.h \
 	include/private/vkd3d_shader.h \
+	libs/vkd3d-shader/checksum.c \
 	libs/vkd3d-shader/dxbc.c \
 	libs/vkd3d-shader/spirv.c \
 	libs/vkd3d-shader/trace.c \
diff --git a/libs/vkd3d-shader/checksum.c b/libs/vkd3d-shader/checksum.c
new file mode 100644
index 000000000000..d2929da92635
--- /dev/null
+++ b/libs/vkd3d-shader/checksum.c
@@ -0,0 +1,276 @@
+/*
+ * Copyright (C) 2001 Nikos Mavroyanopoulos
+ * Copyright (C) 2004 Hans Leidekker
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+/*
+ * This code implements the MD5 message-digest algorithm.
+ * It is based on code in the public domain written by Colin
+ * Plumb in 1993. The algorithm is due to Ron Rivest.
+ *
+ * Equivalent code is available from RSA Data Security, Inc.
+ * This code has been tested against that, and is equivalent,
+ * except that you don't need to include two pages of legalese
+ * with every copy.
+ *
+ * To compute the message digest of a chunk of bytes, declare an
+ * md5_ctx structure, pass it to md5_init, call md5_update as
+ * needed on buffers full of bytes, and then call md5_final, which
+ * will fill a supplied 16-byte array with the digest.
+ */
+
+#include "vkd3d_shader_private.h"
+
+struct md5_ctx
+{
+    unsigned int i[2];
+    unsigned int buf[4];
+    unsigned char in[64];
+    unsigned char digest[16];
+};
+
+/* The four core functions - F1 is optimized somewhat */
+
+/* #define F1(x, y, z) (x & y | ~x & z) */
+#define F1(x, y, z) (z ^ (x & (y ^ z)))
+#define F2(x, y, z) F1(z, x, y)
+#define F3(x, y, z) (x ^ y ^ z)
+#define F4(x, y, z) (y ^ (x | ~z))
+
+/* This is the central step in the MD5 algorithm. */
+#define MD5STEP(f, w, x, y, z, data, s) \
+        (w += f(x, y, z) + data,  w = w << s | w >> (32 - s),  w += x)
+
+/*
+ * The core of the MD5 algorithm, this alters an existing MD5 hash to
+ * reflect the addition of 16 longwords of new data. md5_update blocks
+ * the data and converts bytes into longwords for this routine.
+ */
+static void md5_transform(unsigned int buf[4], const unsigned int in[16])
+{
+    unsigned int a, b, c, d;
+
+    a = buf[0];
+    b = buf[1];
+    c = buf[2];
+    d = buf[3];
+
+    MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
+    MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
+    MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
+    MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
+    MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
+    MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
+    MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
+    MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
+    MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
+    MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
+    MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
+    MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
+    MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
+    MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
+    MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
+    MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
+
+    MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
+    MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
+    MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
+    MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
+    MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
+    MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
+    MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
+    MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
+    MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
+    MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
+    MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
+    MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
+    MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
+    MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
+    MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
+    MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
+
+    MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
+    MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
+    MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
+    MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
+    MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
+    MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
+    MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
+    MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
+    MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
+    MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
+    MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
+    MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
+    MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
+    MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
+    MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
+    MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
+
+    MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
+    MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
+    MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
+    MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
+    MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
+    MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
+    MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
+    MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
+    MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
+    MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
+    MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
+    MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
+    MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
+    MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
+    MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
+    MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
+
+    buf[0] += a;
+    buf[1] += b;
+    buf[2] += c;
+    buf[3] += d;
+}
+
+/*
+ * Note: this code is harmless on little-endian machines.
+ */
+static void byte_reverse(unsigned char *buf, unsigned longs)
+{
+    unsigned int t;
+
+    do
+    {
+        t = ((unsigned)buf[3] << 8 | buf[2]) << 16 |
+            ((unsigned)buf[1] << 8 | buf[0]);
+        *(unsigned int *)buf = t;
+        buf += 4;
+    } while (--longs);
+}
+
+/*
+ * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
+ * initialization constants.
+ */
+void md5_init(struct md5_ctx *ctx)
+{
+    ctx->buf[0] = 0x67452301;
+    ctx->buf[1] = 0xefcdab89;
+    ctx->buf[2] = 0x98badcfe;
+    ctx->buf[3] = 0x10325476;
+
+    ctx->i[0] = ctx->i[1] = 0;
+}
+
+/*
+ * Update context to reflect the concatenation of another buffer full
+ * of bytes.
+ */
+void md5_update(struct md5_ctx *ctx, const unsigned char *buf, unsigned int len)
+{
+    unsigned int t;
+
+    /* Update bitcount */
+    t = ctx->i[0];
+
+    if ((ctx->i[0] = t + (len << 3)) < t)
+        ctx->i[1]++;        /* Carry from low to high */
+
+    ctx->i[1] += len >> 29;
+    t = (t >> 3) & 0x3f;
+
+    /* Handle any leading odd-sized chunks */
+    if (t)
+    {
+        unsigned char *p = (unsigned char *)ctx->in + t;
+        t = 64 - t;
+
+        if (len < t)
+        {
+            memcpy(p, buf, len);
+            return;
+        }
+
+        memcpy(p, buf, t);
+        byte_reverse(ctx->in, 16);
+
+        md5_transform(ctx->buf, (unsigned int *)ctx->in);
+
+        buf += t;
+        len -= t;
+    }
+
+    /* Process data in 64-byte chunks */
+    while (len >= 64)
+    {
+        memcpy(ctx->in, buf, 64);
+        byte_reverse(ctx->in, 16);
+
+        md5_transform(ctx->buf, (unsigned int *)ctx->in);
+
+        buf += 64;
+        len -= 64;
+    }
+
+    /* Handle any remaining bytes of data. */
+    memcpy(ctx->in, buf, len);
+}
+
+/*
+ * Final wrapup - pad to 64-byte boundary with the bit pattern
+ * 1 0* (64-bit count of bits processed, MSB-first)
+ */
+void md5_final(struct md5_ctx *ctx)
+{
+    unsigned int count;
+    unsigned char *p;
+
+    /* Compute number of bytes mod 64 */
+    count = (ctx->i[0] >> 3) & 0x3F;
+
+    /* Set the first char of padding to 0x80.  This is safe since there is
+       always at least one byte free */
+    p = ctx->in + count;
+    *p++ = 0x80;
+
+    /* Bytes of padding needed to make 64 bytes */
+    count = 64 - 1 - count;
+
+    /* Pad out to 56 mod 64 */
+    if (count < 8)
+    {
+        /* Two lots of padding:  Pad the first block to 64 bytes */
+        memset(p, 0, count);
+        byte_reverse(ctx->in, 16);
+        md5_transform(ctx->buf, (unsigned int *)ctx->in);
+
+        /* Now fill the next block with 56 bytes */
+        memset(ctx->in, 0, 56);
+    }
+    else
+    {
+        /* Pad block to 56 bytes */
+        memset(p, 0, count - 8);
+    }
+
+    byte_reverse(ctx->in, 14);
+
+    /* Append length in bits and transform */
+    ((unsigned int *)ctx->in)[14] = ctx->i[0];
+    ((unsigned int *)ctx->in)[15] = ctx->i[1];
+
+    md5_transform(ctx->buf, (unsigned int *)ctx->in);
+    byte_reverse((unsigned char *)ctx->buf, 4);
+    memcpy(ctx->digest, ctx->buf, 16);
+}
diff --git a/libs/vkd3d-shader/vkd3d_shader_private.h b/libs/vkd3d-shader/vkd3d_shader_private.h
index afa002b83616..e0fad6852e53 100644
--- a/libs/vkd3d-shader/vkd3d_shader_private.h
+++ b/libs/vkd3d-shader/vkd3d_shader_private.h
@@ -815,6 +815,12 @@ int vkd3d_dxbc_compiler_generate_spirv(struct vkd3d_dxbc_compiler *compiler,
         struct vkd3d_shader_code *spirv) DECLSPEC_HIDDEN;
 void vkd3d_dxbc_compiler_destroy(struct vkd3d_dxbc_compiler *compiler) DECLSPEC_HIDDEN;
 
+struct md5_ctx;
+
+void md5_init(struct md5_ctx *ctx) DECLSPEC_HIDDEN;
+void md5_update(struct md5_ctx *ctx, const unsigned char *buf, unsigned int len) DECLSPEC_HIDDEN;
+void md5_final(struct md5_ctx *ctx) DECLSPEC_HIDDEN;
+
 static inline enum vkd3d_component_type vkd3d_component_type_from_data_type(
         enum vkd3d_data_type data_type)
 {
-- 
2.19.2

[Henri Verbeet]

Signed-off-by: Henri Verbeet <hverbeet(a)codeweavers.com>