276 lines
9.3 KiB
C
276 lines
9.3 KiB
C
/******************************************************************************
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* *
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* Copyright (C) 1992-1995 Tony Robinson *
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* *
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* See the file doc/LICENSE.shorten for conditions on distribution and usage *
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* *
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******************************************************************************/
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/*
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* $Id$
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "shorten.h"
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#include "bitshift.h"
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#define CAPMAXSCHAR(x) ((x > 127) ? 127 : x)
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#define CAPMAXUCHAR(x) ((x > 255) ? 255 : x)
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#define CAPMAXSHORT(x) ((x > 32767) ? 32767 : x)
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#define CAPMAXUSHORT(x) ((x > 65535) ? 65535 : x)
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static int sizeof_sample[TYPE_EOF];
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void init_sizeof_sample() {
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sizeof_sample[TYPE_AU1] = sizeof(uchar);
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sizeof_sample[TYPE_S8] = sizeof(schar);
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sizeof_sample[TYPE_U8] = sizeof(uchar);
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sizeof_sample[TYPE_S16HL] = sizeof(ushort);
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sizeof_sample[TYPE_U16HL] = sizeof(ushort);
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sizeof_sample[TYPE_S16LH] = sizeof(ushort);
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sizeof_sample[TYPE_U16LH] = sizeof(ushort);
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sizeof_sample[TYPE_ULAW] = sizeof(uchar);
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sizeof_sample[TYPE_AU2] = sizeof(uchar);
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sizeof_sample[TYPE_AU3] = sizeof(uchar);
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sizeof_sample[TYPE_ALAW] = sizeof(uchar);
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}
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/***************/
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/* fixed write */
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/***************/
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void fwrite_type_init(shn_file *this_shn) {
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init_sizeof_sample();
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this_shn->decode_state->writebuf = (schar*) NULL;
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this_shn->decode_state->writefub = (schar*) NULL;
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this_shn->decode_state->nwritebuf = 0;
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}
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void fwrite_type_quit(shn_file *this_shn) {
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if(this_shn->decode_state->writebuf != NULL) {
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free(this_shn->decode_state->writebuf);
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this_shn->decode_state->writebuf = NULL;
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}
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if(this_shn->decode_state->writefub != NULL) {
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free(this_shn->decode_state->writefub);
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this_shn->decode_state->writefub = NULL;
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}
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}
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/* convert from signed ints to a given type and write */
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void fwrite_type(slong **data,int ftype,int nchan,int nitem,shn_file *this_shn)
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{
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int hiloint = 1, hilo = !(*((char*) &hiloint));
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int i, nwrite = 0, datasize = sizeof_sample[ftype], chan;
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slong *data0 = data[0];
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int bufAvailable = OUT_BUFFER_SIZE - this_shn->vars.bytes_in_buf;
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if(this_shn->decode_state->nwritebuf < nchan * nitem * datasize) {
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this_shn->decode_state->nwritebuf = nchan * nitem * datasize;
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if(this_shn->decode_state->writebuf != NULL) free(this_shn->decode_state->writebuf);
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if(this_shn->decode_state->writefub != NULL) free(this_shn->decode_state->writefub);
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this_shn->decode_state->writebuf = (schar*) pmalloc((ulong) this_shn->decode_state->nwritebuf,this_shn);
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if (!this_shn->decode_state->writebuf)
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return;
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this_shn->decode_state->writefub = (schar*) pmalloc((ulong) this_shn->decode_state->nwritebuf,this_shn);
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if (!this_shn->decode_state->writefub)
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return;
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}
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switch(ftype) {
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case TYPE_AU1: /* leave the conversion to fix_bitshift() */
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case TYPE_AU2: {
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uchar *writebufp = (uchar*) this_shn->decode_state->writebuf;
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if(nchan == 1)
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for(i = 0; i < nitem; i++)
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*writebufp++ = data0[i];
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else
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for(i = 0; i < nitem; i++)
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for(chan = 0; chan < nchan; chan++)
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*writebufp++ = data[chan][i];
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break;
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}
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case TYPE_U8: {
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uchar *writebufp = (uchar*) this_shn->decode_state->writebuf;
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if(nchan == 1)
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for(i = 0; i < nitem; i++)
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*writebufp++ = CAPMAXUCHAR(data0[i]);
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else
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for(i = 0; i < nitem; i++)
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for(chan = 0; chan < nchan; chan++)
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*writebufp++ = CAPMAXUCHAR(data[chan][i]);
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break;
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}
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case TYPE_S8: {
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schar *writebufp = (schar*) this_shn->decode_state->writebuf;
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if(nchan == 1)
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for(i = 0; i < nitem; i++)
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*writebufp++ = CAPMAXSCHAR(data0[i]);
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else
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for(i = 0; i < nitem; i++)
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for(chan = 0; chan < nchan; chan++)
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*writebufp++ = CAPMAXSCHAR(data[chan][i]);
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break;
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}
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case TYPE_S16HL:
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case TYPE_S16LH: {
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short *writebufp = (short*) this_shn->decode_state->writebuf;
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if(nchan == 1)
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for(i = 0; i < nitem; i++)
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*writebufp++ = CAPMAXSHORT(data0[i]);
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else
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for(i = 0; i < nitem; i++)
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for(chan = 0; chan < nchan; chan++)
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*writebufp++ = CAPMAXSHORT(data[chan][i]);
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break;
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}
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case TYPE_U16HL:
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case TYPE_U16LH: {
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ushort *writebufp = (ushort*) this_shn->decode_state->writebuf;
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if(nchan == 1)
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for(i = 0; i < nitem; i++)
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*writebufp++ = CAPMAXUSHORT(data0[i]);
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else
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for(i = 0; i < nitem; i++)
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for(chan = 0; chan < nchan; chan++)
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*writebufp++ = CAPMAXUSHORT(data[chan][i]);
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break;
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}
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case TYPE_ULAW: {
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uchar *writebufp = (uchar*) this_shn->decode_state->writebuf;
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if(nchan == 1)
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for(i = 0; i < nitem; i++)
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*writebufp++ = Slinear2ulaw(CAPMAXSHORT((data0[i] << 3)));
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else
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for(i = 0; i < nitem; i++)
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for(chan = 0; chan < nchan; chan++)
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*writebufp++ = Slinear2ulaw(CAPMAXSHORT((data[chan][i] << 3)));
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break;
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}
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case TYPE_AU3: {
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uchar *writebufp = (uchar*) this_shn->decode_state->writebuf;
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if(nchan == 1)
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for(i = 0; i < nitem; i++)
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if(data0[i] < 0)
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*writebufp++ = (127 - data0[i]) ^ 0xd5;
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else
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*writebufp++ = (data0[i] + 128) ^ 0x55;
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else
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for(i = 0; i < nitem; i++)
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for(chan = 0; chan < nchan; chan++)
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if(data[chan][i] < 0)
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*writebufp++ = (127 - data[chan][i]) ^ 0xd5;
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else
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*writebufp++ = (data[chan][i] + 128) ^ 0x55;
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break;
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}
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case TYPE_ALAW: {
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uchar *writebufp = (uchar*) this_shn->decode_state->writebuf;
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if(nchan == 1)
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for(i = 0; i < nitem; i++)
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*writebufp++ = Slinear2alaw(CAPMAXSHORT((data0[i] << 3)));
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else
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for(i = 0; i < nitem; i++)
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for(chan = 0; chan < nchan; chan++)
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*writebufp++ = Slinear2alaw(CAPMAXSHORT((data[chan][i] << 3)));
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break;
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}
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}
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switch(ftype) {
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case TYPE_AU1:
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case TYPE_S8:
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case TYPE_U8:
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case TYPE_ULAW:
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case TYPE_AU2:
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case TYPE_AU3:
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case TYPE_ALAW:
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if (datasize*nchan*nitem <= bufAvailable) {
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memcpy((void *)&this_shn->vars.buffer[this_shn->vars.bytes_in_buf],(const void *)this_shn->decode_state->writebuf,datasize*nchan*nitem);
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this_shn->vars.bytes_in_buf += datasize*nchan*nitem;
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nwrite = nitem;
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}
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else
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shn_debug(this_shn->config, "Buffer overrun in fwrite_type() [case 1]: %d bytes to read, but only %d bytes are available",datasize*nchan*nitem,bufAvailable);
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break;
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case TYPE_S16HL:
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case TYPE_U16HL:
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if(hilo)
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{
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if (datasize*nchan*nitem <= bufAvailable) {
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memcpy((void *)&this_shn->vars.buffer[this_shn->vars.bytes_in_buf],(const void *)this_shn->decode_state->writebuf,datasize*nchan*nitem);
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this_shn->vars.bytes_in_buf += datasize*nchan*nitem;
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nwrite = nitem;
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}
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else
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shn_debug(this_shn->config, "Buffer overrun in fwrite_type() [case 2]: %d bytes to read, but only %d bytes are available",datasize*nchan*nitem,bufAvailable);
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}
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else
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{
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swab(this_shn->decode_state->writebuf, this_shn->decode_state->writefub, datasize * nchan * nitem);
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if (datasize*nchan*nitem <= bufAvailable) {
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memcpy((void *)&this_shn->vars.buffer[this_shn->vars.bytes_in_buf],(const void *)this_shn->decode_state->writefub,datasize*nchan*nitem);
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this_shn->vars.bytes_in_buf += datasize*nchan*nitem;
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nwrite = nitem;
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}
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else
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shn_debug(this_shn->config, "Buffer overrun in fwrite_type() [case 3]: %d bytes to read, but only %d bytes are available",datasize*nchan*nitem,bufAvailable);
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}
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break;
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case TYPE_S16LH:
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case TYPE_U16LH:
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if(hilo)
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{
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swab(this_shn->decode_state->writebuf, this_shn->decode_state->writefub, datasize * nchan * nitem);
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if (datasize*nchan*nitem <= bufAvailable) {
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memcpy((void *)&this_shn->vars.buffer[this_shn->vars.bytes_in_buf],(const void *)this_shn->decode_state->writefub,datasize*nchan*nitem);
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this_shn->vars.bytes_in_buf += datasize*nchan*nitem;
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nwrite = nitem;
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}
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else
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shn_debug(this_shn->config, "Buffer overrun in fwrite_type() [case 4]: %d bytes to read, but only %d bytes are available",datasize*nchan*nitem,bufAvailable);
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}
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else
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{
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if (datasize*nchan*nitem <= bufAvailable) {
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memcpy((void *)&this_shn->vars.buffer[this_shn->vars.bytes_in_buf],(const void *)this_shn->decode_state->writebuf,datasize*nchan*nitem);
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this_shn->vars.bytes_in_buf += datasize*nchan*nitem;
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nwrite = nitem;
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}
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else
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shn_debug(this_shn->config, "Buffer overrun in fwrite_type() [case 5]: %d bytes to read, but only %d bytes are available",datasize*nchan*nitem,bufAvailable);
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}
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break;
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}
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if(nwrite != nitem)
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shn_error_fatal(this_shn,"Failed to write decompressed stream -\npossible corrupt or truncated file");
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}
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/*************/
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/* bitshifts */
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/*************/
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void fix_bitshift(buffer, nitem, bitshift, ftype) slong *buffer; int nitem,
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bitshift, ftype; {
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int i;
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if(ftype == TYPE_AU1)
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for(i = 0; i < nitem; i++)
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buffer[i] = ulaw_outward[bitshift][buffer[i] + 128];
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else if(ftype == TYPE_AU2)
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for(i = 0; i < nitem; i++) {
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if(buffer[i] >= 0)
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buffer[i] = ulaw_outward[bitshift][buffer[i] + 128];
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else if(buffer[i] == -1)
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buffer[i] = NEGATIVE_ULAW_ZERO;
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else
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buffer[i] = ulaw_outward[bitshift][buffer[i] + 129];
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}
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else
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if(bitshift != 0)
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for(i = 0; i < nitem; i++)
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buffer[i] <<= bitshift;
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}
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