DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (d8847129d134)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140

/*
 * Copyright 2010 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 "SkData.h"
#include "SkFlate.h"
#include "SkStream.h"

#ifndef SK_HAS_ZLIB
bool SkFlate::HaveFlate() { return false; }
bool SkFlate::Deflate(SkStream*, SkWStream*) { return false; }
bool SkFlate::Deflate(const void*, size_t, SkWStream*) { return false; }
bool SkFlate::Deflate(const SkData*, SkWStream*) { return false; }
bool SkFlate::Inflate(SkStream*, SkWStream*) { return false; }
#else

// static
bool SkFlate::HaveFlate() {
    return true;
}

namespace {

#ifdef SK_SYSTEM_ZLIB
#include <zlib.h>
#else
#include SK_ZLIB_INCLUDE
#endif

// static
const size_t kBufferSize = 1024;

bool doFlate(bool compress, SkStream* src, SkWStream* dst) {
    uint8_t inputBuffer[kBufferSize];
    uint8_t outputBuffer[kBufferSize];
    z_stream flateData;
    flateData.zalloc = NULL;
    flateData.zfree = NULL;
    flateData.next_in = NULL;
    flateData.avail_in = 0;
    flateData.next_out = outputBuffer;
    flateData.avail_out = kBufferSize;
    int rc;
    if (compress)
        rc = deflateInit(&flateData, Z_DEFAULT_COMPRESSION);
    else
        rc = inflateInit(&flateData);
    if (rc != Z_OK)
        return false;

    uint8_t* input = (uint8_t*)src->getMemoryBase();
    size_t inputLength = src->getLength();
    if (input == NULL || inputLength == 0) {
        input = NULL;
        flateData.next_in = inputBuffer;
        flateData.avail_in = 0;
    } else {
        flateData.next_in = input;
        flateData.avail_in = SkToUInt(inputLength);
    }

    rc = Z_OK;
    while (true) {
        if (flateData.avail_out < kBufferSize) {
            if (!dst->write(outputBuffer, kBufferSize - flateData.avail_out)) {
                rc = Z_BUF_ERROR;
                break;
            }
            flateData.next_out = outputBuffer;
            flateData.avail_out = kBufferSize;
        }
        if (rc != Z_OK)
            break;
        if (flateData.avail_in == 0) {
            if (input != NULL)
                break;
            size_t read = src->read(&inputBuffer, kBufferSize);
            if (read == 0)
                break;
            flateData.next_in = inputBuffer;
            flateData.avail_in = SkToUInt(read);
        }
        if (compress)
            rc = deflate(&flateData, Z_NO_FLUSH);
        else
            rc = inflate(&flateData, Z_NO_FLUSH);
    }
    while (rc == Z_OK) {
        if (compress)
            rc = deflate(&flateData, Z_FINISH);
        else
            rc = inflate(&flateData, Z_FINISH);
        if (flateData.avail_out < kBufferSize) {
            if (!dst->write(outputBuffer, kBufferSize - flateData.avail_out))
                return false;
            flateData.next_out = outputBuffer;
            flateData.avail_out = kBufferSize;
        }
    }

    if (compress)
        deflateEnd(&flateData);
    else
        inflateEnd(&flateData);
    if (rc == Z_STREAM_END)
        return true;
    return false;
}

}

// static
bool SkFlate::Deflate(SkStream* src, SkWStream* dst) {
    return doFlate(true, src, dst);
}

bool SkFlate::Deflate(const void* ptr, size_t len, SkWStream* dst) {
    SkMemoryStream stream(ptr, len);
    return doFlate(true, &stream, dst);
}

bool SkFlate::Deflate(const SkData* data, SkWStream* dst) {
    if (data) {
        SkMemoryStream stream(data->data(), data->size());
        return doFlate(true, &stream, dst);
    }
    return false;
}

// static
bool SkFlate::Inflate(SkStream* src, SkWStream* dst) {
    return doFlate(false, src, dst);
}

#endif