The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/gfx/skia/trunk/src/core/SkWriter32.cpp	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,105 @@
     1.4 +/*
     1.5 + * Copyright 2011 Google Inc.
     1.6 + *
     1.7 + * Use of this source code is governed by a BSD-style license that can be
     1.8 + * found in the LICENSE file.
     1.9 + */
    1.10 +
    1.11 +#include "SkReader32.h"
    1.12 +#include "SkString.h"
    1.13 +#include "SkWriter32.h"
    1.14 +
    1.15 +/*
    1.16 + *  Strings are stored as: length[4-bytes] + string_data + '\0' + pad_to_mul_4
    1.17 + */
    1.18 +
    1.19 +const char* SkReader32::readString(size_t* outLen) {
    1.20 +    size_t len = this->readInt();
    1.21 +    const void* ptr = this->peek();
    1.22 +
    1.23 +    // skip over the string + '\0' and then pad to a multiple of 4
    1.24 +    size_t alignedSize = SkAlign4(len + 1);
    1.25 +    this->skip(alignedSize);
    1.26 +
    1.27 +    if (outLen) {
    1.28 +        *outLen = len;
    1.29 +    }
    1.30 +    return (const char*)ptr;
    1.31 +}
    1.32 +
    1.33 +size_t SkReader32::readIntoString(SkString* copy) {
    1.34 +    size_t len;
    1.35 +    const char* ptr = this->readString(&len);
    1.36 +    if (copy) {
    1.37 +        copy->set(ptr, len);
    1.38 +    }
    1.39 +    return len;
    1.40 +}
    1.41 +
    1.42 +void SkWriter32::writeString(const char str[], size_t len) {
    1.43 +    if (NULL == str) {
    1.44 +        str = "";
    1.45 +        len = 0;
    1.46 +    }
    1.47 +    if ((long)len < 0) {
    1.48 +        len = strlen(str);
    1.49 +    }
    1.50 +
    1.51 +    // [ 4 byte len ] [ str ... ] [1 - 4 \0s]
    1.52 +    uint32_t* ptr = this->reservePad(sizeof(uint32_t) + len + 1);
    1.53 +    *ptr = len;
    1.54 +    char* chars = (char*)(ptr + 1);
    1.55 +    memcpy(chars, str, len);
    1.56 +    chars[len] = '\0';
    1.57 +}
    1.58 +
    1.59 +size_t SkWriter32::WriteStringSize(const char* str, size_t len) {
    1.60 +    if ((long)len < 0) {
    1.61 +        SkASSERT(str);
    1.62 +        len = strlen(str);
    1.63 +    }
    1.64 +    const size_t lenBytes = 4;    // we use 4 bytes to record the length
    1.65 +    // add 1 since we also write a terminating 0
    1.66 +    return SkAlign4(lenBytes + len + 1);
    1.67 +}
    1.68 +
    1.69 +void SkWriter32::growToAtLeast(size_t size) {
    1.70 +    const bool wasExternal = (fExternal != NULL) && (fData == fExternal);
    1.71 +
    1.72 +    fCapacity = 4096 + SkTMax(size, fCapacity + (fCapacity / 2));
    1.73 +    fInternal.realloc(fCapacity);
    1.74 +    fData = fInternal.get();
    1.75 +
    1.76 +    if (wasExternal) {
    1.77 +        // we were external, so copy in the data
    1.78 +        memcpy(fData, fExternal, fUsed);
    1.79 +    }
    1.80 +    // Invalidate the snapshot, we know it is no longer useful.
    1.81 +    fSnapshot.reset(NULL);
    1.82 +}
    1.83 +
    1.84 +SkData* SkWriter32::snapshotAsData() const {
    1.85 +    // get a non const version of this, we are only conceptually const
    1.86 +    SkWriter32& mutable_this = *const_cast<SkWriter32*>(this);
    1.87 +    // we use size change detection to invalidate the cached data
    1.88 +    if ((fSnapshot.get() != NULL) && (fSnapshot->size() != fUsed)) {
    1.89 +        mutable_this.fSnapshot.reset(NULL);
    1.90 +    }
    1.91 +    if (fSnapshot.get() == NULL) {
    1.92 +        uint8_t* buffer = NULL;
    1.93 +        if ((fExternal != NULL) && (fData == fExternal)) {
    1.94 +            // We need to copy to an allocated buffer before returning.
    1.95 +            buffer = (uint8_t*)sk_malloc_throw(fUsed);
    1.96 +            memcpy(buffer, fData, fUsed);
    1.97 +        } else {
    1.98 +            buffer = mutable_this.fInternal.detach();
    1.99 +            // prepare us to do copy on write, by pretending the data buffer
   1.100 +            // is external and size limited
   1.101 +            mutable_this.fData = buffer;
   1.102 +            mutable_this.fCapacity = fUsed;
   1.103 +            mutable_this.fExternal = buffer;
   1.104 +        }
   1.105 +        mutable_this.fSnapshot.reset(SkData::NewFromMalloc(buffer, fUsed));
   1.106 +    }
   1.107 +    return SkRef(fSnapshot.get()); // Take an extra ref for the caller.
   1.108 +}