109 lines
2.7 KiB
C++
109 lines
2.7 KiB
C++
/*
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* Copyright 2003-2017 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "ApeLoader.hxx"
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#include "system/ByteOrder.hxx"
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#include "input/InputStream.hxx"
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#include "util/StringView.hxx"
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#include <memory>
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#include <stdint.h>
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#include <assert.h>
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#include <string.h>
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struct ApeFooter {
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unsigned char id[8];
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uint32_t version;
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uint32_t length;
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uint32_t count;
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unsigned char flags[4];
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unsigned char reserved[8];
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};
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bool
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tag_ape_scan(InputStream &is, ApeTagCallback callback)
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try {
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const std::lock_guard<Mutex> protect(is.mutex);
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if (!is.KnownSize() || !is.CheapSeeking())
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return false;
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/* determine if file has an apeV2 tag */
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ApeFooter footer;
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is.Seek(is.GetSize() - sizeof(footer));
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is.ReadFull(&footer, sizeof(footer));
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if (memcmp(footer.id, "APETAGEX", sizeof(footer.id)) != 0 ||
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FromLE32(footer.version) != 2000)
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return false;
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/* find beginning of ape tag */
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size_t remaining = FromLE32(footer.length);
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if (remaining <= sizeof(footer) + 10 ||
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/* refuse to load more than one megabyte of tag data */
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remaining > 1024 * 1024)
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return false;
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is.Seek(is.GetSize() - remaining);
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/* read tag into buffer */
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remaining -= sizeof(footer);
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assert(remaining > 10);
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std::unique_ptr<char[]> buffer(new char[remaining]);
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is.ReadFull(buffer.get(), remaining);
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/* read tags */
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unsigned n = FromLE32(footer.count);
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const char *p = buffer.get();
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while (n-- && remaining > 10) {
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size_t size = FromLE32(*(const uint32_t *)p);
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p += 4;
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remaining -= 4;
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unsigned long flags = FromLE32(*(const uint32_t *)p);
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p += 4;
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remaining -= 4;
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/* get the key */
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const char *key = p;
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const char *key_end = (const char *)memchr(p, '\0', remaining);
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if (key_end == nullptr)
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break;
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p = key_end + 1;
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remaining -= p - key;
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/* get the value */
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if (remaining < size)
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break;
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if (!callback(flags, key, {p, size}))
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break;
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p += size;
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remaining -= size;
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}
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return true;
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} catch (...) {
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return false;
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}
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