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Diffstat (limited to '')
| -rw-r--r-- | src/DecoderBuffer.cxx | 185 |
1 files changed, 0 insertions, 185 deletions
diff --git a/src/DecoderBuffer.cxx b/src/DecoderBuffer.cxx deleted file mode 100644 index 4a5125bc5..000000000 --- a/src/DecoderBuffer.cxx +++ /dev/null @@ -1,185 +0,0 @@ -/* - * Copyright (C) 2003-2013 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. - */ - -#include "config.h" -#include "DecoderBuffer.hxx" -#include "DecoderAPI.hxx" - -#include <glib.h> - -#include <assert.h> -#include <string.h> - -struct DecoderBuffer { - Decoder *decoder; - InputStream *is; - - /** the allocated size of the buffer */ - size_t size; - - /** the current length of the buffer */ - size_t length; - - /** number of bytes already consumed at the beginning of the - buffer */ - size_t consumed; - - /** the actual buffer (dynamic size) */ - unsigned char data[sizeof(size_t)]; -}; - -DecoderBuffer * -decoder_buffer_new(Decoder *decoder, InputStream &is, - size_t size) -{ - DecoderBuffer *buffer = (DecoderBuffer *) - g_malloc(sizeof(*buffer) - sizeof(buffer->data) + size); - - assert(size > 0); - - buffer->decoder = decoder; - buffer->is = &is; - buffer->size = size; - buffer->length = 0; - buffer->consumed = 0; - - return buffer; -} - -void -decoder_buffer_free(DecoderBuffer *buffer) -{ - assert(buffer != nullptr); - - g_free(buffer); -} - -const InputStream & -decoder_buffer_get_stream(const DecoderBuffer *buffer) -{ - return *buffer->is; -} - -bool -decoder_buffer_is_empty(const DecoderBuffer *buffer) -{ - return buffer->consumed == buffer->length; -} - -bool -decoder_buffer_is_full(const DecoderBuffer *buffer) -{ - return buffer->consumed == 0 && buffer->length == buffer->size; -} - -void -decoder_buffer_clear(DecoderBuffer *buffer) -{ - buffer->length = buffer->consumed = 0; -} - -static void -decoder_buffer_shift(DecoderBuffer *buffer) -{ - assert(buffer->consumed > 0); - - buffer->length -= buffer->consumed; - memmove(buffer->data, buffer->data + buffer->consumed, buffer->length); - buffer->consumed = 0; -} - -bool -decoder_buffer_fill(DecoderBuffer *buffer) -{ - size_t nbytes; - - if (buffer->consumed > 0) - decoder_buffer_shift(buffer); - - if (buffer->length >= buffer->size) - /* buffer is full */ - return false; - - nbytes = decoder_read(buffer->decoder, *buffer->is, - buffer->data + buffer->length, - buffer->size - buffer->length); - if (nbytes == 0) - /* end of file, I/O error or decoder command - received */ - return false; - - buffer->length += nbytes; - assert(buffer->length <= buffer->size); - - return true; -} - -size_t -decoder_buffer_available(const DecoderBuffer *buffer) -{ - return buffer->length - buffer->consumed;; -} - -const void * -decoder_buffer_read(const DecoderBuffer *buffer, size_t *length_r) -{ - if (buffer->consumed >= buffer->length) - /* buffer is empty */ - return nullptr; - - *length_r = buffer->length - buffer->consumed; - return buffer->data + buffer->consumed; -} - -void -decoder_buffer_consume(DecoderBuffer *buffer, size_t nbytes) -{ - /* just move the "consumed" pointer - decoder_buffer_shift() - will do the real work later (called by - decoder_buffer_fill()) */ - buffer->consumed += nbytes; - - assert(buffer->consumed <= buffer->length); -} - -bool -decoder_buffer_skip(DecoderBuffer *buffer, size_t nbytes) -{ - size_t length; - const void *data; - bool success; - - /* this could probably be optimized by seeking */ - - while (true) { - data = decoder_buffer_read(buffer, &length); - if (data != nullptr) { - if (length > nbytes) - length = nbytes; - decoder_buffer_consume(buffer, length); - nbytes -= length; - if (nbytes == 0) - return true; - } - - success = decoder_buffer_fill(buffer); - if (!success) - return false; - } -} |