skpinfo.cpp revision 6f4fb0f1296422a44d5d0dac155d82595dc5ebec 
1/*
2 * Copyright 2014 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 "SkCommandLineFlags.h"
9#include "SkPicture.h"
10#include "SkPicturePlayback.h"
11#include "SkStream.h"
12
13DEFINE_string2(input, i, "", "skp on which to report");
14DEFINE_bool2(version, v, true, "version");
15DEFINE_bool2(width, w, true, "width");
16DEFINE_bool2(height, h, true, "height");
17DEFINE_bool2(tags, t, true, "tags");
18DEFINE_bool2(quiet, q, false, "quiet");
19
20// This tool can print simple information about an SKP but its main use
21// is just to check if an SKP has been truncated during the recording
22// process.
23// return codes:
24static const int kSuccess = 0;
25static const int kTruncatedFile = 1;
26static const int kNotAnSKP = 2;
27static const int kInvalidTag = 3;
28static const int kMissingInput = 4;
29static const int kIOError = 5;
30
31int tool_main(int argc, char** argv);
32int tool_main(int argc, char** argv) {
33    SkCommandLineFlags::SetUsage("Prints information about an skp file");
34    SkCommandLineFlags::Parse(argc, argv);
35
36    if (FLAGS_input.count() != 1) {
37        if (!FLAGS_quiet) {
38            SkDebugf("Missing input file\n");
39        }
40        return kMissingInput;
41    }
42
43    SkFILEStream stream(FLAGS_input[0]);
44    if (!stream.isValid()) {
45        if (!FLAGS_quiet) {
46            SkDebugf("Couldn't open file\n");
47        }
48        return kIOError;
49    }
50
51    size_t totStreamSize = stream.getLength();
52
53    SkPictInfo info;
54    if (!SkPicture::InternalOnly_StreamIsSKP(&stream, &info)) {
55        return kNotAnSKP;
56    }
57
58    if (FLAGS_version && !FLAGS_quiet) {
59        SkDebugf("Version: %d\n", info.fVersion);
60    }
61    if (FLAGS_width && !FLAGS_quiet) {
62        SkDebugf("Width: %d\n", info.fWidth);
63    }
64    if (FLAGS_height && !FLAGS_quiet) {
65        SkDebugf("Height: %d\n", info.fHeight);
66    }
67
68    if (!stream.readBool()) {
69        // If we read true there's a picture playback object flattened
70        // in the file; if false, there isn't a playback, so we're done
71        // reading the file.
72        return kSuccess;
73    }
74
75    for (;;) {
76        uint32_t tag = stream.readU32();
77        if (SK_PICT_EOF_TAG == tag) {
78            break;
79        }
80
81        uint32_t chunkSize = stream.readU32();
82        size_t curPos = stream.getPosition();
83
84        // "move" doesn't error out when seeking beyond the end of file
85        // so we need a preemptive check here.
86        if (curPos+chunkSize > totStreamSize) {
87            if (!FLAGS_quiet) {
88                SkDebugf("truncated file\n");
89            }
90            return kTruncatedFile;
91        }
92
93        // Not all the tags store the chunk size (in bytes). Three
94        // of them store tag-specific size information (e.g., number of
95        // fonts) instead. This forces us to early exit when those
96        // chunks are encountered.
97        switch (tag) {
98        case SK_PICT_READER_TAG:
99            if (FLAGS_tags && !FLAGS_quiet) {
100                SkDebugf("SK_PICT_READER_TAG %d\n", chunkSize);
101            }
102            break;
103        case SK_PICT_FACTORY_TAG:
104            if (FLAGS_tags && !FLAGS_quiet) {
105                SkDebugf("SK_PICT_FACTORY_TAG %d\n", chunkSize);
106                SkDebugf("Exiting early due to format limitations\n");
107            }
108            return kSuccess;       // TODO: need to store size in bytes
109            break;
110        case SK_PICT_TYPEFACE_TAG:
111            if (FLAGS_tags && !FLAGS_quiet) {
112                SkDebugf("SK_PICT_TYPEFACE_TAG %d\n", chunkSize);
113                SkDebugf("Exiting early due to format limitations\n");
114            }
115            return kSuccess;       // TODO: need to store size in bytes
116            break;
117        case SK_PICT_PICTURE_TAG:
118            if (FLAGS_tags && !FLAGS_quiet) {
119                SkDebugf("SK_PICT_PICTURE_TAG %d\n", chunkSize);
120                SkDebugf("Exiting early due to format limitations\n");
121            }
122            return kSuccess;       // TODO: need to store size in bytes
123            break;
124        case SK_PICT_BUFFER_SIZE_TAG:
125            if (FLAGS_tags && !FLAGS_quiet) {
126                SkDebugf("SK_PICT_BUFFER_SIZE_TAG %d\n", chunkSize);
127            }
128            break;
129        default:
130            if (!FLAGS_quiet) {
131                SkDebugf("Unknown tag %d\n", chunkSize);
132            }
133            return kInvalidTag;
134        }
135
136        if (!stream.move(chunkSize)) {
137            if (!FLAGS_quiet) {
138                SkDebugf("seek error\n");
139            }
140            return kTruncatedFile;
141        }
142    }
143
144    return kSuccess;
145}
146
147#if !defined SK_BUILD_FOR_IOS
148int main(int argc, char * const argv[]) {
149    return tool_main(argc, (char**) argv);
150}
151#endif
152