1/*
2 * Copyright 2013 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#include "SkData.h"
9#include "SkStream.h"
10#include "SkStreamHelpers.h"
11#include "SkTypes.h"
12
13size_t CopyStreamToStorage(SkAutoMalloc* storage, SkStream* stream) {
14    SkASSERT(storage != NULL);
15    SkASSERT(stream != NULL);
16
17    if (stream->hasLength()) {
18        const size_t length = stream->getLength();
19        void* dst = storage->reset(length);
20        if (stream->read(dst, length) != length) {
21            return 0;
22        }
23        return length;
24    }
25
26    SkDynamicMemoryWStream tempStream;
27    // Arbitrary buffer size.
28    const size_t bufferSize = 256 * 1024; // 256KB
29    char buffer[bufferSize];
30    SkDEBUGCODE(size_t debugLength = 0;)
31    do {
32        size_t bytesRead = stream->read(buffer, bufferSize);
33        tempStream.write(buffer, bytesRead);
34        SkDEBUGCODE(debugLength += bytesRead);
35        SkASSERT(tempStream.bytesWritten() == debugLength);
36    } while (!stream->isAtEnd());
37    const size_t length = tempStream.bytesWritten();
38    void* dst = storage->reset(length);
39    tempStream.copyTo(dst);
40    return length;
41}
42
43SkData *CopyStreamToData(SkStream* stream) {
44    SkASSERT(stream != NULL);
45
46    if (stream->hasLength()) {
47        const size_t length = stream->getLength();
48        void* dst = sk_malloc_throw(length);
49        if (stream->read(dst, length) != length) {
50            return 0;
51        }
52        return SkData::NewFromMalloc(dst, length);
53    }
54
55    SkDynamicMemoryWStream tempStream;
56    // Arbitrary buffer size.
57    const size_t bufferSize = 256 * 1024; // 256KB
58    char buffer[bufferSize];
59    SkDEBUGCODE(size_t debugLength = 0;)
60    do {
61        size_t bytesRead = stream->read(buffer, bufferSize);
62        tempStream.write(buffer, bytesRead);
63        SkDEBUGCODE(debugLength += bytesRead);
64        SkASSERT(tempStream.bytesWritten() == debugLength);
65    } while (!stream->isAtEnd());
66    return tempStream.copyToData();
67}
68