add read callback to OggFLAC__SeekableStreamEncoder, necessary for metadata rewriting

1 files changed, 189 insertions, 0 deletions

diff --git a/src/libOggFLAC/ogg_helper.c b/src/libOggFLAC/ogg_helper.c
new file mode 100644
index 00000000..fea73a57
--- /dev/null
+++ b/src/libOggFLAC/ogg_helper.c
@@ -0,0 +1,189 @@
+/* libOggFLAC - Free Lossless Audio Codec + Ogg library
+ * Copyright (C) 2002,2003  Josh Coalson
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * - Neither the name of the Xiph.org Foundation nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdlib.h> /* for malloc() */
+#include <string.h> /* for memcmp(), memcpy() */
+#include "FLAC/assert.h"
+#include "private/ogg_helper.h"
+#include "protected/seekable_stream_encoder.h"
+
+
+static FLAC__bool full_read_(OggFLAC__SeekableStreamEncoder *encoder, FLAC__byte *buffer, unsigned bytes, OggFLAC__SeekableStreamEncoderReadCallback read_callback, void *client_data)
+{
+        while(bytes > 0) {
+                unsigned bytes_read = bytes;
+                switch(read_callback(encoder, buffer, &bytes_read, client_data)) {
+                        case OggFLAC__SEEKABLE_STREAM_ENCODER_READ_STATUS_CONTINUE:
+                                bytes -= bytes_read;
+                                buffer += bytes_read;
+                                break;
+                        case OggFLAC__SEEKABLE_STREAM_ENCODER_READ_STATUS_END_OF_STREAM:
+                                if(bytes_read == 0) {
+                                        encoder->protected_->state = OggFLAC__SEEKABLE_STREAM_ENCODER_OGG_ERROR;
+                                        return false;
+                                }
+                                bytes -= bytes_read;
+                                buffer += bytes_read;
+                                break;
+                        case OggFLAC__SEEKABLE_STREAM_ENCODER_READ_STATUS_ABORT:
+                                encoder->protected_->state = OggFLAC__SEEKABLE_STREAM_ENCODER_READ_ERROR;
+                                return false;
+                        default:
+                                /* double protection: */
+                                FLAC__ASSERT(0);
+                                encoder->protected_->state = OggFLAC__SEEKABLE_STREAM_ENCODER_READ_ERROR;
+                                return false;
+                }
+        }
+
+        return true;
+}
+
+void simple_ogg_page__init(ogg_page *page)
+{
+        page->header = 0;
+        page->header_len = 0;
+        page->body = 0;
+        page->body_len = 0;
+}
+
+void simple_ogg_page__clear(ogg_page *page)
+{
+        if(page->header)
+                free(page->header);
+        if(page->body)
+                free(page->body);
+        simple_ogg_page__init(page);
+}
+
+FLAC__bool simple_ogg_page__get_at(OggFLAC__SeekableStreamEncoder *encoder, FLAC__uint64 position, ogg_page *page, OggFLAC__SeekableStreamEncoderSeekCallback seek_callback, OggFLAC__SeekableStreamEncoderReadCallback read_callback, void *client_data)
+{
+        static const unsigned OGG_HEADER_FIXED_PORTION_LEN = 27;
+        static const unsigned OGG_MAX_HEADER_LEN = 27/*OGG_HEADER_FIXED_PORTION_LEN*/ + 255;
+        FLAC__byte crc[4];
+
+        FLAC__ASSERT(page->header = 0);
+        FLAC__ASSERT(page->header_len = 0);
+        FLAC__ASSERT(page->body = 0);
+        FLAC__ASSERT(page->body_len = 0);
+
+        /* move the stream pointer to the supposed beginning of the page */
+        if(seek_callback(encoder, position, client_data) != FLAC__SEEKABLE_STREAM_ENCODER_SEEK_STATUS_OK) {
+                encoder->protected_->state = OggFLAC__SEEKABLE_STREAM_ENCODER_SEEK_ERROR;
+                return false;
+        }
+
+        /* allocate space for the page header */
+        if(0 == (page->header = malloc(OGG_MAX_HEADER_LEN))) {
+                encoder->protected_->state = OggFLAC__SEEKABLE_STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
+                return false;
+        }
+
+        /* read in the fixed part of the page header (up to but not including
+         * the segment table */
+        if(!full_read_(encoder, page->header, OGG_HEADER_FIXED_PORTION_LEN, read_callback, client_data))
+                return false;
+
+        page->header_len = OGG_HEADER_FIXED_PORTION_LEN + page->header[26];
+
+        /* check to see if it's a correct, "simple" page (one packet only) */
+        if(
+                memcmp(page->header, "OggS", 4) ||               /* doesn't start with OggS */
+                (page->header[5] & 0x01) ||                      /* continued packet */
+                memcmp(page->header+6, "\0\0\0\0\0\0\0\0", 8) || /* granulepos is non-zero */
+                page->header[26] == 0                            /* packet is 0-size */
+        ) {
+                encoder->protected_->state = OggFLAC__SEEKABLE_STREAM_ENCODER_OGG_ERROR;
+                return false;
+        }
+
+        /* read in the segment table */
+        if(!full_read_(encoder, page->header + OGG_HEADER_FIXED_PORTION_LEN, page->header[26], read_callback, client_data))
+                return false;
+
+        {
+                unsigned i;
+
+                /* check to see that it specifies a single packet */
+                for(i = 0; i < (unsigned)page->header[26] - 1; i++) {
+                        if(page->header[i + OGG_HEADER_FIXED_PORTION_LEN] != 255) {
+                                encoder->protected_->state = OggFLAC__SEEKABLE_STREAM_ENCODER_OGG_ERROR;
+                                return false;
+                        }
+                }
+
+                page->body_len = 255 * i + page->header[i];
+        }
+
+        /* allocate space for the page body */
+        if(0 == (page->body = malloc(page->body_len))) {
+                encoder->protected_->state = OggFLAC__SEEKABLE_STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
+                return false;
+        }
+
+        /* read in the page body */
+        if(!full_read_(encoder, page->body, page->body_len, read_callback, client_data))
+                return false;
+
+        /* check the CRC */
+        memcpy(crc, page->header+22, 4);
+        ogg_page_checksum_set(page);
+        if(memcmp(crc, page->header+22, 4)) {
+                encoder->protected_->state = OggFLAC__SEEKABLE_STREAM_ENCODER_OGG_ERROR;
+                return false;
+        }
+
+        return true;
+}
+
+FLAC__bool simple_ogg_page__set_at(OggFLAC__SeekableStreamEncoder *encoder, FLAC__uint64 position, ogg_page *page, OggFLAC__SeekableStreamEncoderSeekCallback seek_callback, OggFLAC__SeekableStreamEncoderWriteCallback write_callback, void *client_data)
+{
+        FLAC__ASSERT(page->header != 0);
+        FLAC__ASSERT(page->header_len != 0);
+        FLAC__ASSERT(page->body != 0);
+        FLAC__ASSERT(page->body_len != 0);
+
+        /* move the stream pointer to the supposed beginning of the page */
+        if(seek_callback(encoder, position, client_data) != FLAC__SEEKABLE_STREAM_ENCODER_SEEK_STATUS_OK) {
+                encoder->protected_->state = OggFLAC__SEEKABLE_STREAM_ENCODER_SEEK_ERROR;
+                return false;
+        }
+
+        ogg_page_checksum_set(page);
+
+        /* re-write the page */
+        if(write_callback(encoder, page->header, page->header_len, 0, 0, client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK) {
+                encoder->protected_->state = OggFLAC__SEEKABLE_STREAM_ENCODER_WRITE_ERROR;
+                return false;
+        }
+
+        return true;
+}