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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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