The Tor Browser: gfx/skia/trunk/src/core/SkUtils.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/core/SkUtils.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/core/SkUtils.cpp

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkUtils.h"
 #if 0
 #define assign_16_longs(dst, value)             \
     do {                                        \
         (dst)[0] = value;   (dst)[1] = value;   \
         (dst)[2] = value;   (dst)[3] = value;   \
         (dst)[4] = value;   (dst)[5] = value;   \
         (dst)[6] = value;   (dst)[7] = value;   \
         (dst)[8] = value;   (dst)[9] = value;   \
         (dst)[10] = value;  (dst)[11] = value;  \
         (dst)[12] = value;  (dst)[13] = value;  \
         (dst)[14] = value;  (dst)[15] = value;  \
     } while (0)
 #else
 #define assign_16_longs(dst, value)             \
     do {                                        \
         *(dst)++ = value;   *(dst)++ = value;   \
         *(dst)++ = value;   *(dst)++ = value;   \
         *(dst)++ = value;   *(dst)++ = value;   \
         *(dst)++ = value;   *(dst)++ = value;   \
         *(dst)++ = value;   *(dst)++ = value;   \
         *(dst)++ = value;   *(dst)++ = value;   \
         *(dst)++ = value;   *(dst)++ = value;   \
         *(dst)++ = value;   *(dst)++ = value;   \
     } while (0)
 #endif
 ///////////////////////////////////////////////////////////////////////////////
 void sk_memset16_portable(uint16_t dst[], uint16_t value, int count) {
     SkASSERT(dst != NULL && count >= 0);
     if (count <= 0) {
         return;
     }
     // not sure if this helps to short-circuit on small values of count
     if (count < 8) {
         do {
             *dst++ = (uint16_t)value;
         } while (--count != 0);
         return;
     }
     // ensure we're on a long boundary
     if ((size_t)dst & 2) {
         *dst++ = (uint16_t)value;
         count -= 1;
     }
     uint32_t value32 = ((uint32_t)value << 16) | value;
     // handle the bulk with our unrolled macro
     {
         int sixteenlongs = count >> 5;
         if (sixteenlongs) {
             uint32_t* dst32 = (uint32_t*)dst;
             do {
                 assign_16_longs(dst32, value32);
             } while (--sixteenlongs != 0);
             dst = (uint16_t*)dst32;
             count &= 31;
         }
     }
     // handle (most) of the rest
     {
         int longs = count >> 1;
         if (longs) {
             do {
                 *(uint32_t*)dst = value32;
                 dst += 2;
             } while (--longs != 0);
         }
     }
     // cleanup a possible trailing short
     if (count & 1) {
         *dst = (uint16_t)value;
     }
 }
 void sk_memset32_portable(uint32_t dst[], uint32_t value, int count) {
     SkASSERT(dst != NULL && count >= 0);
     int sixteenlongs = count >> 4;
     if (sixteenlongs) {
         do {
             assign_16_longs(dst, value);
         } while (--sixteenlongs != 0);
         count &= 15;
     }
     if (count) {
         do {
             *dst++ = value;
         } while (--count != 0);
     }
 }
 static void sk_memset16_stub(uint16_t dst[], uint16_t value, int count) {
     SkMemset16Proc proc = SkMemset16GetPlatformProc();
     sk_memset16 = proc ? proc : sk_memset16_portable;
     sk_memset16(dst, value, count);
 }
 SkMemset16Proc sk_memset16 = sk_memset16_stub;
 static void sk_memset32_stub(uint32_t dst[], uint32_t value, int count) {
     SkMemset32Proc proc = SkMemset32GetPlatformProc();
     sk_memset32 = proc ? proc : sk_memset32_portable;
     sk_memset32(dst, value, count);
 }
 SkMemset32Proc sk_memset32 = sk_memset32_stub;
 ///////////////////////////////////////////////////////////////////////////////
 /*  0xxxxxxx    1 total
 xxxxxx    // never a leading byte
 xxxxx    2 total
 xxxx    3 total
 xxx    4 total
 10 01 01 xx xx xx xx 0...
 xE5XX0000
 xE5 << 24
 */
 #ifdef SK_DEBUG
     static void assert_utf8_leadingbyte(unsigned c) {
         SkASSERT(c <= 0xF7);    // otherwise leading byte is too big (more than 4 bytes)
         SkASSERT((c & 0xC0) != 0x80);   // can't begin with a middle char
     }
     int SkUTF8_LeadByteToCount(unsigned c) {
         assert_utf8_leadingbyte(c);
         return (((0xE5 << 24) >> (c >> 4 << 1)) & 3) + 1;
     }
 #else
     #define assert_utf8_leadingbyte(c)
 #endif
 int SkUTF8_CountUnichars(const char utf8[]) {
     SkASSERT(utf8);
     int count = 0;
     for (;;) {
         int c = *(const uint8_t*)utf8;
         if (c == 0) {
             break;
         }
         utf8 += SkUTF8_LeadByteToCount(c);
         count += 1;
     }
     return count;
 }
 int SkUTF8_CountUnichars(const char utf8[], size_t byteLength) {
     SkASSERT(NULL != utf8 || 0 == byteLength);
     int         count = 0;
     const char* stop = utf8 + byteLength;
     while (utf8 < stop) {
         utf8 += SkUTF8_LeadByteToCount(*(const uint8_t*)utf8);
         count += 1;
     }
     return count;
 }
 SkUnichar SkUTF8_ToUnichar(const char utf8[]) {
     SkASSERT(NULL != utf8);
     const uint8_t*  p = (const uint8_t*)utf8;
     int             c = *p;
     int             hic = c << 24;
     assert_utf8_leadingbyte(c);
     if (hic < 0) {
         uint32_t mask = (uint32_t)~0x3F;
         hic <<= 1;
         do {
             c = (c << 6) | (*++p & 0x3F);
             mask <<= 5;
         } while ((hic <<= 1) < 0);
         c &= ~mask;
     }
     return c;
 }
 SkUnichar SkUTF8_NextUnichar(const char** ptr) {
     SkASSERT(NULL != ptr && NULL != *ptr);
     const uint8_t*  p = (const uint8_t*)*ptr;
     int             c = *p;
     int             hic = c << 24;
     assert_utf8_leadingbyte(c);
     if (hic < 0) {
         uint32_t mask = (uint32_t)~0x3F;
         hic <<= 1;
         do {
             c = (c << 6) | (*++p & 0x3F);
             mask <<= 5;
         } while ((hic <<= 1) < 0);
         c &= ~mask;
     }
     *ptr = (char*)p + 1;
     return c;
 }
 SkUnichar SkUTF8_PrevUnichar(const char** ptr) {
     SkASSERT(NULL != ptr && NULL != *ptr);
     const char* p = *ptr;
     if (*--p & 0x80) {
         while (*--p & 0x40) {
             ;
         }
     }
     *ptr = (char*)p;
     return SkUTF8_NextUnichar(&p);
 }
 size_t SkUTF8_FromUnichar(SkUnichar uni, char utf8[]) {
     if ((uint32_t)uni > 0x10FFFF) {
         SkDEBUGFAIL("bad unichar");
         return 0;
     }
     if (uni <= 127) {
         if (utf8) {
             *utf8 = (char)uni;
         }
         return 1;
     }
     char    tmp[4];
     char*   p = tmp;
     size_t  count = 1;
     SkDEBUGCODE(SkUnichar orig = uni;)
     while (uni > 0x7F >> count) {
         *p++ = (char)(0x80 | (uni & 0x3F));
         uni >>= 6;
         count += 1;
     }
     if (utf8) {
         p = tmp;
         utf8 += count;
         while (p < tmp + count - 1) {
             *--utf8 = *p++;
         }
         *--utf8 = (char)(~(0xFF >> count) | uni);
     }
     SkASSERT(utf8 == NULL || orig == SkUTF8_ToUnichar(utf8));
     return count;
 }
 ///////////////////////////////////////////////////////////////////////////////
 int SkUTF16_CountUnichars(const uint16_t src[]) {
     SkASSERT(src);
     int count = 0;
     unsigned c;
     while ((c = *src++) != 0) {
         SkASSERT(!SkUTF16_IsLowSurrogate(c));
         if (SkUTF16_IsHighSurrogate(c)) {
             c = *src++;
             SkASSERT(SkUTF16_IsLowSurrogate(c));
         }
         count += 1;
     }
     return count;
 }
 int SkUTF16_CountUnichars(const uint16_t src[], int numberOf16BitValues) {
     SkASSERT(src);
     const uint16_t* stop = src + numberOf16BitValues;
     int count = 0;
     while (src < stop) {
         unsigned c = *src++;
         SkASSERT(!SkUTF16_IsLowSurrogate(c));
         if (SkUTF16_IsHighSurrogate(c)) {
             SkASSERT(src < stop);
             c = *src++;
             SkASSERT(SkUTF16_IsLowSurrogate(c));
         }
         count += 1;
     }
     return count;
 }
 SkUnichar SkUTF16_NextUnichar(const uint16_t** srcPtr) {
     SkASSERT(srcPtr && *srcPtr);
     const uint16_t* src = *srcPtr;
     SkUnichar       c = *src++;
     SkASSERT(!SkUTF16_IsLowSurrogate(c));
     if (SkUTF16_IsHighSurrogate(c)) {
         unsigned c2 = *src++;
         SkASSERT(SkUTF16_IsLowSurrogate(c2));
         // c = ((c & 0x3FF) << 10) + (c2 & 0x3FF) + 0x10000
         // c = (((c & 0x3FF) + 64) << 10) + (c2 & 0x3FF)
         c = (c << 10) + c2 + (0x10000 - (0xD800 << 10) - 0xDC00);
     }
     *srcPtr = src;
     return c;
 }
 SkUnichar SkUTF16_PrevUnichar(const uint16_t** srcPtr) {
     SkASSERT(srcPtr && *srcPtr);
     const uint16_t* src = *srcPtr;
     SkUnichar       c = *--src;
     SkASSERT(!SkUTF16_IsHighSurrogate(c));
     if (SkUTF16_IsLowSurrogate(c)) {
         unsigned c2 = *--src;
         SkASSERT(SkUTF16_IsHighSurrogate(c2));
         c = (c2 << 10) + c + (0x10000 - (0xD800 << 10) - 0xDC00);
     }
     *srcPtr = src;
     return c;
 }
 size_t SkUTF16_FromUnichar(SkUnichar uni, uint16_t dst[]) {
     SkASSERT((unsigned)uni <= 0x10FFFF);
     int extra = (uni > 0xFFFF);
     if (dst) {
         if (extra) {
             // dst[0] = SkToU16(0xD800 | ((uni - 0x10000) >> 10));
             // dst[0] = SkToU16(0xD800 | ((uni >> 10) - 64));
             dst[0] = SkToU16((0xD800 - 64) + (uni >> 10));
             dst[1] = SkToU16(0xDC00 | (uni & 0x3FF));
             SkASSERT(SkUTF16_IsHighSurrogate(dst[0]));
             SkASSERT(SkUTF16_IsLowSurrogate(dst[1]));
         } else {
             dst[0] = SkToU16(uni);
             SkASSERT(!SkUTF16_IsHighSurrogate(dst[0]));
             SkASSERT(!SkUTF16_IsLowSurrogate(dst[0]));
         }
     }
     return 1 + extra;
 }
 size_t SkUTF16_ToUTF8(const uint16_t utf16[], int numberOf16BitValues,
                       char utf8[]) {
     SkASSERT(numberOf16BitValues >= 0);
     if (numberOf16BitValues <= 0) {
         return 0;
     }
     SkASSERT(utf16 != NULL);
     const uint16_t* stop = utf16 + numberOf16BitValues;
     size_t          size = 0;
     if (utf8 == NULL) {    // just count
         while (utf16 < stop) {
             size += SkUTF8_FromUnichar(SkUTF16_NextUnichar(&utf16), NULL);
         }
     } else {
         char* start = utf8;
         while (utf16 < stop) {
             utf8 += SkUTF8_FromUnichar(SkUTF16_NextUnichar(&utf16), utf8);
         }
         size = utf8 - start;
     }
     return size;
 }

The Tor Browser / annotate

gfx/skia/trunk/src/core/SkUtils.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/core/SkUtils.cpp