gfx/ots/src/vorg.cc@97036ab72558 (annotated)
gfx/ots/src/vorg.cc
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
| michael@0 | 1 | // Copyright (c) 2009 The Chromium Authors. All rights reserved. |
| michael@0 | 2 | // Use of this source code is governed by a BSD-style license that can be |
| michael@0 | 3 | // found in the LICENSE file. |
| michael@0 | 4 | |
| michael@0 | 5 | #include "vorg.h" |
| michael@0 | 6 | |
| michael@0 | 7 | #include <vector> |
| michael@0 | 8 | |
| michael@0 | 9 | // VORG - Vertical Origin Table |
| michael@0 | 10 | // http://www.microsoft.com/typography/otspec/vorg.htm |
| michael@0 | 11 | |
| michael@0 | 12 | #define TABLE_NAME "VORG" |
| michael@0 | 13 | |
| michael@0 | 14 | #define DROP_THIS_TABLE \ |
| michael@0 | 15 | do { \ |
| michael@0 | 16 | delete file->vorg; \ |
| michael@0 | 17 | file->vorg = 0; \ |
| michael@0 | 18 | OTS_FAILURE_MSG("Table discarded"); \ |
| michael@0 | 19 | } while (0) |
| michael@0 | 20 | |
| michael@0 | 21 | namespace ots { |
| michael@0 | 22 | |
| michael@0 | 23 | bool ots_vorg_parse(OpenTypeFile *file, const uint8_t *data, size_t length) { |
| michael@0 | 24 | Buffer table(data, length); |
| michael@0 | 25 | file->vorg = new OpenTypeVORG; |
| michael@0 | 26 | OpenTypeVORG * const vorg = file->vorg; |
| michael@0 | 27 | |
| michael@0 | 28 | uint16_t num_recs; |
| michael@0 | 29 | if (!table.ReadU16(&vorg->major_version) || |
| michael@0 | 30 | !table.ReadU16(&vorg->minor_version) || |
| michael@0 | 31 | !table.ReadS16(&vorg->default_vert_origin_y) || |
| michael@0 | 32 | !table.ReadU16(&num_recs)) { |
| michael@0 | 33 | return OTS_FAILURE_MSG("Failed to read header"); |
| michael@0 | 34 | } |
| michael@0 | 35 | if (vorg->major_version != 1) { |
| michael@0 | 36 | OTS_WARNING("bad major version: %u", vorg->major_version); |
| michael@0 | 37 | DROP_THIS_TABLE; |
| michael@0 | 38 | return true; |
| michael@0 | 39 | } |
| michael@0 | 40 | if (vorg->minor_version != 0) { |
| michael@0 | 41 | OTS_WARNING("bad minor version: %u", vorg->minor_version); |
| michael@0 | 42 | DROP_THIS_TABLE; |
| michael@0 | 43 | return true; |
| michael@0 | 44 | } |
| michael@0 | 45 | |
| michael@0 | 46 | // num_recs might be zero (e.g., DFHSMinchoPro5-W3-Demo.otf). |
| michael@0 | 47 | if (!num_recs) { |
| michael@0 | 48 | return true; |
| michael@0 | 49 | } |
| michael@0 | 50 | |
| michael@0 | 51 | uint16_t last_glyph_index = 0; |
| michael@0 | 52 | vorg->metrics.reserve(num_recs); |
| michael@0 | 53 | for (unsigned i = 0; i < num_recs; ++i) { |
| michael@0 | 54 | OpenTypeVORGMetrics rec; |
| michael@0 | 55 | |
| michael@0 | 56 | if (!table.ReadU16(&rec.glyph_index) || |
| michael@0 | 57 | !table.ReadS16(&rec.vert_origin_y)) { |
| michael@0 | 58 | return OTS_FAILURE_MSG("Failed to read record %d", i); |
| michael@0 | 59 | } |
| michael@0 | 60 | if ((i != 0) && (rec.glyph_index <= last_glyph_index)) { |
| michael@0 | 61 | OTS_WARNING("the table is not sorted"); |
| michael@0 | 62 | DROP_THIS_TABLE; |
| michael@0 | 63 | return true; |
| michael@0 | 64 | } |
| michael@0 | 65 | last_glyph_index = rec.glyph_index; |
| michael@0 | 66 | |
| michael@0 | 67 | vorg->metrics.push_back(rec); |
| michael@0 | 68 | } |
| michael@0 | 69 | |
| michael@0 | 70 | return true; |
| michael@0 | 71 | } |
| michael@0 | 72 | |
| michael@0 | 73 | bool ots_vorg_should_serialise(OpenTypeFile *file) { |
| michael@0 | 74 | if (!file->cff) return false; // this table is not for fonts with TT glyphs. |
| michael@0 | 75 | return file->vorg != NULL; |
| michael@0 | 76 | } |
| michael@0 | 77 | |
| michael@0 | 78 | bool ots_vorg_serialise(OTSStream *out, OpenTypeFile *file) { |
| michael@0 | 79 | OpenTypeVORG * const vorg = file->vorg; |
| michael@0 | 80 | |
| michael@0 | 81 | if (!out->WriteU16(vorg->major_version) || |
| michael@0 | 82 | !out->WriteU16(vorg->minor_version) || |
| michael@0 | 83 | !out->WriteS16(vorg->default_vert_origin_y) || |
| michael@0 | 84 | !out->WriteU16(vorg->metrics.size())) { |
| michael@0 | 85 | return OTS_FAILURE_MSG("Failed to write table header"); |
| michael@0 | 86 | } |
| michael@0 | 87 | |
| michael@0 | 88 | for (unsigned i = 0; i < vorg->metrics.size(); ++i) { |
| michael@0 | 89 | const OpenTypeVORGMetrics& rec = vorg->metrics[i]; |
| michael@0 | 90 | if (!out->WriteU16(rec.glyph_index) || |
| michael@0 | 91 | !out->WriteS16(rec.vert_origin_y)) { |
| michael@0 | 92 | return OTS_FAILURE_MSG("Failed to write record %d", i); |
| michael@0 | 93 | } |
| michael@0 | 94 | } |
| michael@0 | 95 | |
| michael@0 | 96 | return true; |
| michael@0 | 97 | } |
| michael@0 | 98 | |
| michael@0 | 99 | void ots_vorg_free(OpenTypeFile *file) { |
| michael@0 | 100 | delete file->vorg; |
| michael@0 | 101 | } |
| michael@0 | 102 | |
| michael@0 | 103 | } // namespace ots |
