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Diffstat (limited to '')
-rw-r--r-- | src/decoder/OpusReader.hxx | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/src/decoder/OpusReader.hxx b/src/decoder/OpusReader.hxx new file mode 100644 index 000000000..1fd07b55c --- /dev/null +++ b/src/decoder/OpusReader.hxx @@ -0,0 +1,98 @@ +/* + * Copyright (C) 2003-2012 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#ifndef MPD_OPUS_READER_HXX +#define MPD_OPUS_READER_HXX + +#include "check.h" +#include "string_util.h" + +#include <stdint.h> +#include <string.h> + +class OpusReader { + const uint8_t *p, *const end; + +public: + OpusReader(const void *_p, size_t size) + :p((const uint8_t *)_p), end(p + size) {} + + bool Skip(size_t length) { + p += length; + return p <= end; + } + + const void *Read(size_t length) { + const uint8_t *result = p; + return Skip(length) + ? result + : nullptr; + } + + bool Expect(const void *value, size_t length) { + const void *data = Read(length); + return data != nullptr && memcmp(value, data, length) == 0; + } + + bool ReadByte(uint8_t &value_r) { + if (p >= end) + return false; + + value_r = *p++; + return true; + } + + bool ReadShort(uint16_t &value_r) { + const uint8_t *value = (const uint8_t *)Read(sizeof(value_r)); + if (value == nullptr) + return false; + + value_r = value[0] | (value[1] << 8); + return true; + } + + bool ReadWord(uint32_t &value_r) { + const uint8_t *value = (const uint8_t *)Read(sizeof(value_r)); + if (value == nullptr) + return false; + + value_r = value[0] | (value[1] << 8) + | (value[2] << 16) | (value[3] << 24); + return true; + } + + bool SkipString() { + uint32_t length; + return ReadWord(length) && Skip(length); + } + + char *ReadString() { + uint32_t length; + if (!ReadWord(length)) + return nullptr; + + const char *src = (const char *)Read(length); + if (src == nullptr) + return nullptr; + + return strndup(src, length); + } +}; + +#endif |