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////////////////////////////////////////////////////////////////////////////
// **** WAVPACK **** //
// Hybrid Lossless Wavefile Compressor //
// Copyright (c) 1998 - 2003 Conifer Software. //
// All Rights Reserved. //
// Distributed under the BSD Software License (see license.txt) //
////////////////////////////////////////////////////////////////////////////
// metadata.c
// This module handles the metadata structure introduced in WavPack 4.0
#include "wavpack.h"
#include <string.h>
int read_metadata_buff (WavpackContext *wpc, WavpackMetadata *wpmd)
{
uchar tchar;
if (!wpc->infile (&wpmd->id, 1) || !wpc->infile (&tchar, 1))
return FALSE;
wpmd->byte_length = tchar << 1;
if (wpmd->id & ID_LARGE) {
wpmd->id &= ~ID_LARGE;
if (!wpc->infile (&tchar, 1))
return FALSE;
wpmd->byte_length += (int32_t) tchar << 9;
if (!wpc->infile (&tchar, 1))
return FALSE;
wpmd->byte_length += (int32_t) tchar << 17;
}
if (wpmd->id & ID_ODD_SIZE) {
wpmd->id &= ~ID_ODD_SIZE;
wpmd->byte_length--;
}
if (wpmd->byte_length && wpmd->byte_length <= (int32_t)sizeof (wpc->read_buffer)) {
uint32_t bytes_to_read = wpmd->byte_length + (wpmd->byte_length & 1);
if (wpc->infile (wpc->read_buffer, bytes_to_read) != (int32_t) bytes_to_read) {
wpmd->data = NULL;
return FALSE;
}
wpmd->data = wpc->read_buffer;
}
else
wpmd->data = NULL;
return TRUE;
}
int process_metadata (WavpackContext *wpc, WavpackMetadata *wpmd)
{
WavpackStream *wps = &wpc->stream;
switch (wpmd->id) {
case ID_DUMMY:
return TRUE;
case ID_DECORR_TERMS:
return read_decorr_terms (wps, wpmd);
case ID_DECORR_WEIGHTS:
return read_decorr_weights (wps, wpmd);
case ID_DECORR_SAMPLES:
return read_decorr_samples (wps, wpmd);
case ID_ENTROPY_VARS:
return read_entropy_vars (wps, wpmd);
case ID_HYBRID_PROFILE:
return read_hybrid_profile (wps, wpmd);
case ID_FLOAT_INFO:
return read_float_info (wps, wpmd);
case ID_INT32_INFO:
return read_int32_info (wps, wpmd);
case ID_CHANNEL_INFO:
return read_channel_info (wpc, wpmd);
case ID_CONFIG_BLOCK:
return read_config_info (wpc, wpmd);
case ID_WV_BITSTREAM:
return init_wv_bitstream (wpc, wpmd);
case ID_SHAPING_WEIGHTS:
case ID_WVC_BITSTREAM:
case ID_WVX_BITSTREAM:
return TRUE;
default:
return (wpmd->id & ID_OPTIONAL_DATA) ? TRUE : FALSE;
}
}
int copy_metadata (WavpackMetadata *wpmd, uchar *buffer_start, uchar *buffer_end)
{
uint32_t mdsize = wpmd->byte_length + (wpmd->byte_length & 1);
WavpackHeader *wphdr = (WavpackHeader *) buffer_start;
if (wpmd->byte_length & 1)
((char *) wpmd->data) [wpmd->byte_length] = 0;
mdsize += (wpmd->byte_length > 510) ? 4 : 2;
buffer_start += wphdr->ckSize + 8;
if (buffer_start + mdsize >= buffer_end)
return FALSE;
buffer_start [0] = wpmd->id | (wpmd->byte_length & 1 ? ID_ODD_SIZE : 0);
buffer_start [1] = (wpmd->byte_length + 1) >> 1;
if (wpmd->byte_length > 510) {
buffer_start [0] |= ID_LARGE;
buffer_start [2] = (wpmd->byte_length + 1) >> 9;
buffer_start [3] = (wpmd->byte_length + 1) >> 17;
}
if (wpmd->data && wpmd->byte_length) {
if (wpmd->byte_length > 510) {
buffer_start [0] |= ID_LARGE;
buffer_start [2] = (wpmd->byte_length + 1) >> 9;
buffer_start [3] = (wpmd->byte_length + 1) >> 17;
memcpy (buffer_start + 4, wpmd->data, mdsize - 4);
}
else
memcpy (buffer_start + 2, wpmd->data, mdsize - 2);
}
wphdr->ckSize += mdsize;
return TRUE;
}
void free_metadata (WavpackMetadata *wpmd)
{
wpmd->data = NULL;
}
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