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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "components/visitedlink/common/visitedlink_common.h" | 5 #include "components/visitedlink/common/visitedlink_common.h" |
6 | 6 |
7 #include <string.h> // for memset() | 7 #include <string.h> // for memset() |
8 | 8 |
9 #include "base/logging.h" | 9 #include "base/logging.h" |
10 #include "base/md5.h" | 10 #include "base/md5.h" |
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71 // | 71 // |
72 // FIXME: this uses the MD5SUM of the 16-bit character version. For systems | 72 // FIXME: this uses the MD5SUM of the 16-bit character version. For systems |
73 // where wchar_t is not 16 bits (Linux uses 32 bits, I think), this will not be | 73 // where wchar_t is not 16 bits (Linux uses 32 bits, I think), this will not be |
74 // compatable. We should define explicitly what should happen here across | 74 // compatable. We should define explicitly what should happen here across |
75 // platforms, and convert if necessary (probably to UTF-16). | 75 // platforms, and convert if necessary (probably to UTF-16). |
76 | 76 |
77 // static | 77 // static |
78 VisitedLinkCommon::Fingerprint VisitedLinkCommon::ComputeURLFingerprint( | 78 VisitedLinkCommon::Fingerprint VisitedLinkCommon::ComputeURLFingerprint( |
79 const char* canonical_url, | 79 const char* canonical_url, |
80 size_t url_len, | 80 size_t url_len, |
81 const uint8 salt[LINK_SALT_LENGTH]) { | 81 const uint8_t salt[LINK_SALT_LENGTH]) { |
82 DCHECK(url_len > 0) << "Canonical URLs should not be empty"; | 82 DCHECK(url_len > 0) << "Canonical URLs should not be empty"; |
83 | 83 |
84 base::MD5Context ctx; | 84 base::MD5Context ctx; |
85 base::MD5Init(&ctx); | 85 base::MD5Init(&ctx); |
86 base::MD5Update(&ctx, base::StringPiece(reinterpret_cast<const char*>(salt), | 86 base::MD5Update(&ctx, base::StringPiece(reinterpret_cast<const char*>(salt), |
87 LINK_SALT_LENGTH)); | 87 LINK_SALT_LENGTH)); |
88 base::MD5Update(&ctx, base::StringPiece(canonical_url, url_len)); | 88 base::MD5Update(&ctx, base::StringPiece(canonical_url, url_len)); |
89 | 89 |
90 base::MD5Digest digest; | 90 base::MD5Digest digest; |
91 base::MD5Final(&digest, &ctx); | 91 base::MD5Final(&digest, &ctx); |
92 | 92 |
93 // This is the same as "return *(Fingerprint*)&digest.a;" but if we do that | 93 // This is the same as "return *(Fingerprint*)&digest.a;" but if we do that |
94 // direct cast the alignment could be wrong, and we can't access a 64-bit int | 94 // direct cast the alignment could be wrong, and we can't access a 64-bit int |
95 // on arbitrary alignment on some processors. This reinterpret_casts it | 95 // on arbitrary alignment on some processors. This reinterpret_casts it |
96 // down to a char array of the same size as fingerprint, and then does the | 96 // down to a char array of the same size as fingerprint, and then does the |
97 // bit cast, which amounts to a memcpy. This does not handle endian issues. | 97 // bit cast, which amounts to a memcpy. This does not handle endian issues. |
98 return bit_cast<Fingerprint, uint8[8]>( | 98 return bit_cast<Fingerprint, uint8_t[8]>( |
99 *reinterpret_cast<uint8(*)[8]>(&digest.a)); | 99 *reinterpret_cast<uint8_t(*)[8]>(&digest.a)); |
100 } | 100 } |
101 | 101 |
102 } // namespace visitedlink | 102 } // namespace visitedlink |
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