318 lines
9.3 KiB
C
318 lines
9.3 KiB
C
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//---------------------------------------------------------------------------------
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//
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// Little Color Management System
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// Copyright (c) 1998-2010 Marti Maria Saguer
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the Software
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// is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
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// THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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//---------------------------------------------------------------------------------
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#include "lcms2_internal.h"
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#ifdef CMS_USE_BIG_ENDIAN
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static
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void byteReverse(cmsUInt8Number * buf, cmsUInt32Number longs)
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{
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do {
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cmsUInt32Number t = _cmsAdjustEndianess32(*(cmsUInt32Number *) buf);
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*(cmsUInt32Number *) buf = t;
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buf += sizeof(cmsUInt32Number);
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} while (--longs);
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}
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#else
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#define byteReverse(buf, len)
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#endif
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typedef struct {
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cmsUInt32Number buf[4];
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cmsUInt32Number bits[2];
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cmsUInt8Number in[64];
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cmsContext ContextID;
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} _cmsMD5;
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#define F1(x, y, z) (z ^ (x & (y ^ z)))
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#define F2(x, y, z) F1(z, x, y)
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#define F3(x, y, z) (x ^ y ^ z)
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#define F4(x, y, z) (y ^ (x | ~z))
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#define STEP(f, w, x, y, z, data, s) \
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( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
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static
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void MD5_Transform(cmsUInt32Number buf[4], cmsUInt32Number in[16])
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{
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register cmsUInt32Number a, b, c, d;
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a = buf[0];
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b = buf[1];
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c = buf[2];
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d = buf[3];
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STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
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STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
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STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
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STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
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STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
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STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
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STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
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STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
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STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
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STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
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STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
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STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
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STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
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STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
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STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
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STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
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STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
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STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
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STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
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STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
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STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
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STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
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STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
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STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
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STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
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STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
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STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
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STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
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STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
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STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
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STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
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STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
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STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
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STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
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STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
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STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
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STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
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STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
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STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
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STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
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STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
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STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
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STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
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STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
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STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
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STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
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STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
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STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
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STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
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STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
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STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
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STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
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STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
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STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
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STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
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STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
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STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
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STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
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STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
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STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
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STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
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STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
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STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
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STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
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buf[0] += a;
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buf[1] += b;
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buf[2] += c;
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buf[3] += d;
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}
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// Create a MD5 object
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static
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cmsHANDLE MD5alloc(cmsContext ContextID)
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{
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_cmsMD5* ctx = (_cmsMD5*) _cmsMallocZero(ContextID, sizeof(_cmsMD5));
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if (ctx == NULL) return NULL;
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ctx ->ContextID = ContextID;
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ctx->buf[0] = 0x67452301;
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ctx->buf[1] = 0xefcdab89;
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ctx->buf[2] = 0x98badcfe;
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ctx->buf[3] = 0x10325476;
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ctx->bits[0] = 0;
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ctx->bits[1] = 0;
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return (cmsHANDLE) ctx;
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}
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static
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void MD5add(cmsHANDLE Handle, cmsUInt8Number* buf, cmsUInt32Number len)
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{
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_cmsMD5* ctx = (_cmsMD5*) Handle;
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cmsUInt32Number t;
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t = ctx->bits[0];
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if ((ctx->bits[0] = t + (len << 3)) < t)
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ctx->bits[1]++;
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ctx->bits[1] += len >> 29;
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t = (t >> 3) & 0x3f;
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if (t) {
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cmsUInt8Number *p = (cmsUInt8Number *) ctx->in + t;
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t = 64 - t;
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if (len < t) {
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memmove(p, buf, len);
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return;
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}
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memmove(p, buf, t);
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byteReverse(ctx->in, 16);
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MD5_Transform(ctx->buf, (cmsUInt32Number *) ctx->in);
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buf += t;
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len -= t;
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}
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while (len >= 64) {
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memmove(ctx->in, buf, 64);
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byteReverse(ctx->in, 16);
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MD5_Transform(ctx->buf, (cmsUInt32Number *) ctx->in);
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buf += 64;
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len -= 64;
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}
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memmove(ctx->in, buf, len);
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}
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// Destroy the object and return the checksum
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static
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void MD5finish(cmsProfileID* ProfileID, cmsHANDLE Handle)
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{
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_cmsMD5* ctx = (_cmsMD5*) Handle;
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cmsUInt32Number count;
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cmsUInt8Number *p;
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count = (ctx->bits[0] >> 3) & 0x3F;
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p = ctx->in + count;
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*p++ = 0x80;
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count = 64 - 1 - count;
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if (count < 8) {
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memset(p, 0, count);
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byteReverse(ctx->in, 16);
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MD5_Transform(ctx->buf, (cmsUInt32Number *) ctx->in);
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memset(ctx->in, 0, 56);
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} else {
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memset(p, 0, count - 8);
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}
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byteReverse(ctx->in, 14);
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((cmsUInt32Number *) ctx->in)[14] = ctx->bits[0];
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((cmsUInt32Number *) ctx->in)[15] = ctx->bits[1];
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MD5_Transform(ctx->buf, (cmsUInt32Number *) ctx->in);
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byteReverse((cmsUInt8Number *) ctx->buf, 4);
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memmove(ProfileID ->ID8, ctx->buf, 16);
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_cmsFree(ctx ->ContextID, ctx);
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}
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// Assuming io points to an ICC profile, compute and store MD5 checksum
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// In the header, rendering intentent, attributes and ID should be set to zero
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// before computing MD5 checksum (per 6.1.13 in ICC spec)
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cmsBool CMSEXPORT cmsMD5computeID(cmsHPROFILE hProfile)
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{
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cmsContext ContextID;
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cmsUInt32Number BytesNeeded;
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cmsUInt8Number* Mem = NULL;
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cmsHANDLE MD5 = NULL;
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_cmsICCPROFILE* Icc = (_cmsICCPROFILE*) hProfile;
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_cmsICCPROFILE Keep;
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_cmsAssert(hProfile != NULL);
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ContextID = cmsGetProfileContextID(hProfile);
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// Save a copy of the profile header
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memmove(&Keep, Icc, sizeof(_cmsICCPROFILE));
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// Set RI, attributes and ID
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memset(&Icc ->attributes, 0, sizeof(Icc ->attributes));
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Icc ->RenderingIntent = 0;
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memset(&Icc ->ProfileID, 0, sizeof(Icc ->ProfileID));
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// Compute needed storage
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if (!cmsSaveProfileToMem(hProfile, NULL, &BytesNeeded)) goto Error;
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// Allocate memory
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Mem = (cmsUInt8Number*) _cmsMalloc(ContextID, BytesNeeded);
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if (Mem == NULL) goto Error;
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// Save to temporary storage
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if (!cmsSaveProfileToMem(hProfile, Mem, &BytesNeeded)) goto Error;
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// Create MD5 object
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MD5 = MD5alloc(ContextID);
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if (MD5 == NULL) goto Error;
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// Add all bytes
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MD5add(MD5, Mem, BytesNeeded);
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// Temp storage is no longer needed
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_cmsFree(ContextID, Mem);
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// Restore header
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memmove(Icc, &Keep, sizeof(_cmsICCPROFILE));
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// And store the ID
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MD5finish(&Icc ->ProfileID, MD5);
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return TRUE;
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Error:
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// Free resources as something went wrong
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if (MD5 != NULL) _cmsFree(ContextID, MD5);
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if (Mem != NULL) _cmsFree(ContextID, Mem);
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memmove(Icc, &Keep, sizeof(_cmsICCPROFILE));
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return FALSE;
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}
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