98 lines
2.2 KiB
C++
98 lines
2.2 KiB
C++
/*
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* Copyright (C) 2003-2012 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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#ifndef MPD_OPUS_READER_HXX
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#define MPD_OPUS_READER_HXX
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#include "check.h"
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#include <stdint.h>
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#include <string.h>
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class OpusReader {
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const uint8_t *p, *const end;
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public:
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OpusReader(const void *_p, size_t size)
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:p((const uint8_t *)_p), end(p + size) {}
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bool Skip(size_t length) {
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p += length;
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return p <= end;
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}
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const void *Read(size_t length) {
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const uint8_t *result = p;
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return Skip(length)
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? result
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: nullptr;
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}
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bool Expect(const void *value, size_t length) {
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const void *data = Read(length);
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return data != nullptr && memcmp(value, data, length) == 0;
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}
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bool ReadByte(uint8_t &value_r) {
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if (p >= end)
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return false;
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value_r = *p++;
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return true;
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}
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bool ReadShort(uint16_t &value_r) {
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const uint8_t *value = (const uint8_t *)Read(sizeof(value_r));
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if (value == nullptr)
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return false;
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value_r = value[0] | (value[1] << 8);
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return true;
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}
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bool ReadWord(uint32_t &value_r) {
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const uint8_t *value = (const uint8_t *)Read(sizeof(value_r));
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if (value == nullptr)
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return false;
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value_r = value[0] | (value[1] << 8)
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| (value[2] << 16) | (value[3] << 24);
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return true;
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}
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bool SkipString() {
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uint32_t length;
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return ReadWord(length) && Skip(length);
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}
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char *ReadString() {
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uint32_t length;
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if (!ReadWord(length))
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return nullptr;
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const char *src = (const char *)Read(length);
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if (src == nullptr)
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return nullptr;
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return strndup(src, length);
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}
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};
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#endif
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