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/** @file inflate.c
* @brief Functions to inflate data/tags
* @ingroup MAT
*/
/*
* Copyright (C) 2005-2011 Christopher C. Hulbert
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY CHRISTOPHER C. HULBERT ``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 CHRISTOPHER C. HULBERT 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>
#include "matio_private.h"
#if HAVE_ZLIB
/** @cond mat_devman */
/** @brief Inflate the data until @c nbytes of uncompressed data has been
* inflated
*
* @ingroup mat_internal
* @param mat Pointer to the MAT file
* @param z zlib compression stream
* @param nbytes Number of uncompressed bytes to skip
* @return Number of bytes read from the file
*/
int
InflateSkip(mat_t *mat, z_stream *z, int nbytes)
{
mat_uint8_t comp_buf[512],uncomp_buf[512];
int bytesread = 0, n,err, cnt = 0;
if ( nbytes < 1 )
return 0;
n = (nbytes<512) ? nbytes : 512;
if ( !z->avail_in ) {
z->next_in = comp_buf;
z->avail_in += fread(comp_buf,1,n,mat->fp);
bytesread += z->avail_in;
}
z->avail_out = n;
z->next_out = uncomp_buf;
err = inflate(z,Z_FULL_FLUSH);
if ( err == Z_STREAM_END ) {
return bytesread;
} else if ( err != Z_OK ) {
Mat_Critical("InflateSkip: inflate returned %d",err);
return bytesread;
}
if ( !z->avail_out ) {
cnt += n;
n = ((nbytes-cnt)<512) ? nbytes-cnt : 512;
z->avail_out = n;
z->next_out = uncomp_buf;
}
while ( cnt < nbytes ) {
if ( !z->avail_in ) {
z->next_in = comp_buf;
z->avail_in += fread(comp_buf,1,n,mat->fp);
bytesread += z->avail_in;
}
err = inflate(z,Z_FULL_FLUSH);
if ( err == Z_STREAM_END ) {
break;
} else if ( err != Z_OK ) {
Mat_Critical("InflateSkip: inflate returned %d",err);
break;
}
if ( !z->avail_out ) {
cnt += n;
n = ((nbytes-cnt)<512) ? nbytes-cnt : 512;
z->avail_out = n;
z->next_out = uncomp_buf;
}
}
if ( z->avail_in ) {
long offset = -(long)z->avail_in;
fseek(mat->fp,offset,SEEK_CUR);
bytesread -= z->avail_in;
z->avail_in = 0;
}
return bytesread;
}
/** @brief Inflate the data until @c nbytes of compressed data has been
* inflated
*
* @ingroup mat_internal
* @param mat Pointer to the MAT file
* @param z zlib compression stream
* @param nbytes Number of uncompressed bytes to skip
* @return Number of bytes read from the file
*/
int
InflateSkip2(mat_t *mat, matvar_t *matvar, int nbytes)
{
mat_uint8_t comp_buf[32],uncomp_buf[32];
int bytesread = 0, err, cnt = 0;
if ( !matvar->internal->z->avail_in ) {
matvar->internal->z->avail_in = 1;
matvar->internal->z->next_in = comp_buf;
bytesread += fread(comp_buf,1,1,mat->fp);
}
matvar->internal->z->avail_out = 1;
matvar->internal->z->next_out = uncomp_buf;
err = inflate(matvar->internal->z,Z_NO_FLUSH);
if ( err != Z_OK ) {
Mat_Critical("InflateSkip2: %s - inflate returned %d",matvar->name,err);
return bytesread;
}
if ( !matvar->internal->z->avail_out ) {
matvar->internal->z->avail_out = 1;
matvar->internal->z->next_out = uncomp_buf;
}
while ( cnt < nbytes ) {
if ( !matvar->internal->z->avail_in ) {
matvar->internal->z->avail_in = 1;
matvar->internal->z->next_in = comp_buf;
bytesread += fread(comp_buf,1,1,mat->fp);
cnt++;
}
err = inflate(matvar->internal->z,Z_NO_FLUSH);
if ( err != Z_OK ) {
Mat_Critical("InflateSkip2: %s - inflate returned %d",matvar->name,err);
return bytesread;
}
if ( !matvar->internal->z->avail_out ) {
matvar->internal->z->avail_out = 1;
matvar->internal->z->next_out = uncomp_buf;
}
}
if ( matvar->internal->z->avail_in ) {
fseek(mat->fp,-(int)matvar->internal->z->avail_in,SEEK_CUR);
bytesread -= matvar->internal->z->avail_in;
matvar->internal->z->avail_in = 0;
}
return bytesread;
}
/** @brief Inflate the data until @c len elements of compressed data with data
* type @c data_type has been inflated
*
* @ingroup mat_internal
* @param mat Pointer to the MAT file
* @param z zlib compression stream
* @param data_type Data type (matio_types enumerations)
* @param len Number of elements of datatype @c data_type to skip
* @return Number of bytes read from the file
*/
int
InflateSkipData(mat_t *mat,z_stream *z,enum matio_types data_type,int len)
{
int data_size = 0;
if ( (mat == NULL) || (z == NULL) )
return 0;
else if ( len < 1 )
return 0;
switch ( data_type ) {
case MAT_T_DOUBLE:
data_size = sizeof(double);
break;
case MAT_T_SINGLE:
data_size = sizeof(float);
break;
#ifdef HAVE_MAT_INT64_T
case MAT_T_INT64:
data_size = sizeof(mat_int64_t);
break;
#endif /* HAVE_MAT_INT64_T */
#ifdef HAVE_MAT_UINT64_T
case MAT_T_UINT64:
data_size = sizeof(mat_uint64_t);
break;
#endif /* HAVE_MAT_UINT64_T */
case MAT_T_INT32:
data_size = sizeof(mat_int32_t);
break;
case MAT_T_UINT32:
data_size = sizeof(mat_uint32_t);
break;
case MAT_T_INT16:
data_size = sizeof(mat_int16_t);
break;
case MAT_T_UINT16:
data_size = sizeof(mat_uint16_t);
break;
case MAT_T_UINT8:
data_size = sizeof(mat_uint8_t);
break;
case MAT_T_INT8:
data_size = sizeof(mat_int8_t);
break;
}
InflateSkip(mat,z,len*data_size);
return len;
}
/** @brief Inflates the variable's tag.
*
* @c buf must hold at least 8 bytes
* @ingroup mat_internal
* @param mat Pointer to the MAT file
* @param matvar Pointer to the MAT variable
* @param buf Pointer to store the 8-byte variable tag
* @return Number of bytes read from the file
*/
int
InflateVarTag(mat_t *mat, matvar_t *matvar, void *buf)
{
mat_uint8_t comp_buf[32];
int bytesread = 0, err;
if (buf == NULL)
return 0;
if ( !matvar->internal->z->avail_in ) {
matvar->internal->z->avail_in = 1;
matvar->internal->z->next_in = comp_buf;
bytesread += fread(comp_buf,1,1,mat->fp);
}
matvar->internal->z->avail_out = 8;
matvar->internal->z->next_out = buf;
err = inflate(matvar->internal->z,Z_NO_FLUSH);
if ( err != Z_OK ) {
Mat_Critical("InflateVarTag: inflate returned %d",err);
return bytesread;
}
while ( matvar->internal->z->avail_out && !matvar->internal->z->avail_in ) {
matvar->internal->z->avail_in = 1;
matvar->internal->z->next_in = comp_buf;
bytesread += fread(comp_buf,1,1,mat->fp);
err = inflate(matvar->internal->z,Z_NO_FLUSH);
if ( err != Z_OK ) {
Mat_Critical("InflateVarTag: inflate returned %d",err);
return bytesread;
}
}
if ( matvar->internal->z->avail_in ) {
fseek(mat->fp,-(int)matvar->internal->z->avail_in,SEEK_CUR);
bytesread -= matvar->internal->z->avail_in;
matvar->internal->z->avail_in = 0;
}
return bytesread;
}
/** @brief Inflates the Array Flags Tag and the Array Flags data.
*
* @c buf must hold at least 16 bytes
* @ingroup mat_internal
* @param mat Pointer to the MAT file
* @param matvar Pointer to the MAT variable
* @param buf Pointer to store the 16-byte array flags tag and data
* @return Number of bytes read from the file
*/
int
InflateArrayFlags(mat_t *mat, matvar_t *matvar, void *buf)
{
mat_uint8_t comp_buf[32];
int bytesread = 0, err;
if (buf == NULL) return 0;
if ( !matvar->internal->z->avail_in ) {
matvar->internal->z->avail_in = 1;
matvar->internal->z->next_in = comp_buf;
bytesread += fread(comp_buf,1,1,mat->fp);
}
matvar->internal->z->avail_out = 16;
matvar->internal->z->next_out = buf;
err = inflate(matvar->internal->z,Z_NO_FLUSH);
if ( err != Z_OK ) {
Mat_Critical("InflateArrayFlags: inflate returned %d",err);
return bytesread;
}
while ( matvar->internal->z->avail_out && !matvar->internal->z->avail_in ) {
matvar->internal->z->avail_in = 1;
matvar->internal->z->next_in = comp_buf;
bytesread += fread(comp_buf,1,1,mat->fp);
err = inflate(matvar->internal->z,Z_NO_FLUSH);
if ( err != Z_OK ) {
Mat_Critical("InflateArrayFlags: inflate returned %d",err);
return bytesread;
}
}
if ( matvar->internal->z->avail_in ) {
fseek(mat->fp,-(int)matvar->internal->z->avail_in,SEEK_CUR);
bytesread -= matvar->internal->z->avail_in;
matvar->internal->z->avail_in = 0;
}
return bytesread;
}
/** @brief Inflates the dimensions tag and the dimensions data
*
* @c buf must hold at least (8+4*rank) bytes where rank is the number of
* dimensions. If the end of the dimensions data is not aligned on an 8-byte
* boundary, this function eats up those bytes and stores then in @c buf.
* @ingroup mat_internal
* @param mat Pointer to the MAT file
* @param matvar Pointer to the MAT variable
* @param buf Pointer to store the dimensions flag and data
* @return Number of bytes read from the file
*/
int
InflateDimensions(mat_t *mat, matvar_t *matvar, void *buf)
{
mat_uint8_t comp_buf[32];
mat_int32_t tag[2];
int bytesread = 0, err, rank, i;
if ( buf == NULL )
return 0;
if ( !matvar->internal->z->avail_in ) {
matvar->internal->z->avail_in = 1;
matvar->internal->z->next_in = comp_buf;
bytesread += fread(comp_buf,1,1,mat->fp);
}
matvar->internal->z->avail_out = 8;
matvar->internal->z->next_out = buf;
err = inflate(matvar->internal->z,Z_NO_FLUSH);
if ( err != Z_OK ) {
Mat_Critical("InflateDimensions: inflate returned %d",err);
return bytesread;
}
while ( matvar->internal->z->avail_out && !matvar->internal->z->avail_in ) {
matvar->internal->z->avail_in = 1;
matvar->internal->z->next_in = comp_buf;
bytesread += fread(comp_buf,1,1,mat->fp);
err = inflate(matvar->internal->z,Z_NO_FLUSH);
if ( err != Z_OK ) {
Mat_Critical("InflateDimensions: inflate returned %d",err);
return bytesread;
}
}
tag[0] = *(int *)buf;
tag[1] = *((int *)buf+1);
if ( mat->byteswap ) {
Mat_int32Swap(tag);
Mat_int32Swap(tag+1);
}
if ( (tag[0] & 0x0000ffff) != MAT_T_INT32 ) {
Mat_Critical("InflateDimensions: Reading dimensions expected type MAT_T_INT32");
return bytesread;
}
rank = tag[1];
if ( rank % 8 != 0 )
i = 8-(rank %8);
else
i = 0;
rank+=i;
if ( !matvar->internal->z->avail_in ) {
matvar->internal->z->avail_in = 1;
matvar->internal->z->next_in = comp_buf;
bytesread += fread(comp_buf,1,1,mat->fp);
}
matvar->internal->z->avail_out = rank;
matvar->internal->z->next_out = (void *)((mat_int32_t *)buf+2);
err = inflate(matvar->internal->z,Z_NO_FLUSH);
if ( err != Z_OK ) {
Mat_Critical("InflateDimensions: inflate returned %d",err);
return bytesread;
}
while ( matvar->internal->z->avail_out && !matvar->internal->z->avail_in ) {
matvar->internal->z->avail_in = 1;
matvar->internal->z->next_in = comp_buf;
bytesread += fread(comp_buf,1,1,mat->fp);
err = inflate(matvar->internal->z,Z_NO_FLUSH);
if ( err != Z_OK ) {
Mat_Critical("InflateDimensions: inflate returned %d",err);
return bytesread;
}
}
if ( matvar->internal->z->avail_in ) {
fseek(mat->fp,-(int)matvar->internal->z->avail_in,SEEK_CUR);
bytesread -= matvar->internal->z->avail_in;
matvar->internal->z->avail_in = 0;
}
return bytesread;
}
/** @brief Inflates the variable name tag
*
* @ingroup mat_internal
* @param mat Pointer to the MAT file
* @param matvar Pointer to the MAT variable
* @param buf Pointer to store the variables name tag
* @return Number of bytes read from the file
*/
int
InflateVarNameTag(mat_t *mat, matvar_t *matvar, void *buf)
{
mat_uint8_t comp_buf[32];
int bytesread = 0, err;
if ( buf == NULL )
return 0;
if ( !matvar->internal->z->avail_in ) {
matvar->internal->z->avail_in = 1;
matvar->internal->z->next_in = comp_buf;
bytesread += fread(comp_buf,1,1,mat->fp);
}
matvar->internal->z->avail_out = 8;
matvar->internal->z->next_out = buf;
err = inflate(matvar->internal->z,Z_NO_FLUSH);
if ( err != Z_OK ) {
Mat_Critical("InflateVarNameTag: inflate returned %d",err);
return bytesread;
}
while ( matvar->internal->z->avail_out && !matvar->internal->z->avail_in ) {
matvar->internal->z->avail_in = 1;
matvar->internal->z->next_in = comp_buf;
bytesread += fread(comp_buf,1,1,mat->fp);
err = inflate(matvar->internal->z,Z_NO_FLUSH);
if ( err != Z_OK ) {
Mat_Critical("InflateVarNameTag: inflate returned %d",err);
return bytesread;
}
}
if ( matvar->internal->z->avail_in ) {
fseek(mat->fp,-(int)matvar->internal->z->avail_in,SEEK_CUR);
bytesread -= matvar->internal->z->avail_in;
matvar->internal->z->avail_in = 0;
}
return bytesread;
}
/** @brief Inflates the variable name
*
* @ingroup mat_internal
* @param mat Pointer to the MAT file
* @param matvar Pointer to the MAT variable
* @param buf Pointer to store the variables name
* @param N Number of characters in the name
* @return Number of bytes read from the file
*/
int
InflateVarName(mat_t *mat, matvar_t *matvar, void *buf, int N)
{
mat_uint8_t comp_buf[32];
int bytesread = 0, err;
if ( buf == NULL )
return 0;
if ( !matvar->internal->z->avail_in ) {
matvar->internal->z->avail_in = 1;
matvar->internal->z->next_in = comp_buf;
bytesread += fread(comp_buf,1,1,mat->fp);
}
matvar->internal->z->avail_out = N;
matvar->internal->z->next_out = buf;
err = inflate(matvar->internal->z,Z_NO_FLUSH);
if ( err != Z_OK ) {
Mat_Critical("InflateVarName: inflate returned %d",err);
return bytesread;
}
while ( matvar->internal->z->avail_out && !matvar->internal->z->avail_in ) {
matvar->internal->z->avail_in = 1;
matvar->internal->z->next_in = comp_buf;
bytesread += fread(comp_buf,1,1,mat->fp);
err = inflate(matvar->internal->z,Z_NO_FLUSH);
if ( err != Z_OK ) {
Mat_Critical("InflateVarName: inflate returned %d",err);
return bytesread;
}
}
if ( matvar->internal->z->avail_in ) {
fseek(mat->fp,-(int)matvar->internal->z->avail_in,SEEK_CUR);
bytesread -= matvar->internal->z->avail_in;
matvar->internal->z->avail_in = 0;
}
return bytesread;
}
/** @brief Inflates the data's tag
*
* buf must hold at least 8 bytes
* @ingroup mat_internal
* @param mat Pointer to the MAT file
* @param matvar Pointer to the MAT variable
* @param buf Pointer to store the data tag
* @return Number of bytes read from the file
*/
int
InflateDataTag(mat_t *mat, matvar_t *matvar, void *buf)
{
mat_uint8_t comp_buf[32];
int bytesread = 0, err;
if ( buf == NULL )
return 0;
if ( !matvar->internal->z->avail_in ) {
matvar->internal->z->avail_in = 1;
matvar->internal->z->next_in = comp_buf;
bytesread += fread(comp_buf,1,1,mat->fp);
}
matvar->internal->z->avail_out = 8;
matvar->internal->z->next_out = buf;
err = inflate(matvar->internal->z,Z_NO_FLUSH);
if ( err == Z_STREAM_END ) {
return bytesread;
} else if ( err != Z_OK ) {
Mat_Critical("InflateDataTag: %s - inflate returned %d",matvar->name,err);
return bytesread;
}
while ( matvar->internal->z->avail_out && !matvar->internal->z->avail_in ) {
matvar->internal->z->avail_in = 1;
matvar->internal->z->next_in = comp_buf;
bytesread += fread(comp_buf,1,1,mat->fp);
err = inflate(matvar->internal->z,Z_NO_FLUSH);
if ( err == Z_STREAM_END ) {
break;
} else if ( err != Z_OK ) {
Mat_Critical("InflateDataTag: %s - inflate returned %d",matvar->name,err);
return bytesread;
}
}
if ( matvar->internal->z->avail_in ) {
fseek(mat->fp,-(int)matvar->internal->z->avail_in,SEEK_CUR);
bytesread -= matvar->internal->z->avail_in;
matvar->internal->z->avail_in = 0;
}
return bytesread;
}
/** @brief Inflates the data's type
*
* buf must hold at least 4 bytes
* @ingroup mat_internal
* @param mat Pointer to the MAT file
* @param matvar Pointer to the MAT variable
* @param buf Pointer to store the data type
* @return Number of bytes read from the file
*/
int
InflateDataType(mat_t *mat, z_stream *z, void *buf)
{
mat_uint8_t comp_buf[32];
int bytesread = 0, err;
if ( buf == NULL )
return 0;
if ( !z->avail_in ) {
z->avail_in = 1;
z->next_in = comp_buf;
bytesread += fread(comp_buf,1,1,mat->fp);
}
z->avail_out = 4;
z->next_out = buf;
err = inflate(z,Z_NO_FLUSH);
if ( err != Z_OK ) {
Mat_Critical("InflateDataType: inflate returned %d",err);
return bytesread;
}
while ( z->avail_out && !z->avail_in ) {
z->avail_in = 1;
z->next_in = comp_buf;
bytesread += fread(comp_buf,1,1,mat->fp);
err = inflate(z,Z_NO_FLUSH);
if ( err != Z_OK ) {
Mat_Critical("InflateDataType: inflate returned %d",err);
return bytesread;
}
}
if ( z->avail_in ) {
fseek(mat->fp,-(int)z->avail_in,SEEK_CUR);
bytesread -= z->avail_in;
z->avail_in = 0;
}
return bytesread;
}
/** @brief Inflates the data
*
* buf must hold at least @c nBytes bytes
* @ingroup mat_internal
* @param mat Pointer to the MAT file
* @param z zlib compression stream
* @param buf Pointer to store the data type
* @param nBytes Number of bytes to inflate
* @return Number of bytes read from the file
*/
int
InflateData(mat_t *mat, z_stream *z, void *buf, int nBytes)
{
mat_uint8_t comp_buf[1024];
int bytesread = 0, err;
if ( buf == NULL )
return 0;
if ( nBytes < 1 ) {
Mat_Critical("InflateData: nBytes must be > 0");
return bytesread;
}
if ( !z->avail_in ) {
if ( nBytes > 1024 ) {
z->avail_in = fread(comp_buf,1,1024,mat->fp);
bytesread += z->avail_in;
z->next_in = comp_buf;
} else {
z->avail_in = fread(comp_buf,1,nBytes,mat->fp);
bytesread += z->avail_in;
z->next_in = comp_buf;
}
}
z->avail_out = nBytes;
z->next_out = buf;
err = inflate(z,Z_FULL_FLUSH);
if ( err == Z_STREAM_END ) {
return bytesread;
} else if ( err != Z_OK ) {
Mat_Critical("InflateData: inflate returned %d",err);
return bytesread;
}
while ( z->avail_out && !z->avail_in ) {
if ( (nBytes-bytesread) > 1024 ) {
z->avail_in = fread(comp_buf,1,1024,mat->fp);
bytesread += z->avail_in;
z->next_in = comp_buf;
} else if ( (nBytes-bytesread) < 1 ) { /* Read a byte at a time */
z->avail_in = fread(comp_buf,1,1,mat->fp);
bytesread += z->avail_in;
z->next_in = comp_buf;
} else {
z->avail_in = fread(comp_buf,1,nBytes-bytesread,mat->fp);
bytesread += z->avail_in;
z->next_in = comp_buf;
}
err = inflate(z,Z_FULL_FLUSH);
if ( err == Z_STREAM_END ) {
break;
} else if ( err != Z_OK && err != Z_BUF_ERROR ) {
Mat_Critical("InflateData: inflate returned %d",err);
break;
}
}
if ( z->avail_in ) {
long offset = -(long)z->avail_in;
fseek(mat->fp,offset,SEEK_CUR);
bytesread -= z->avail_in;
z->avail_in = 0;
}
return bytesread;
}
/** @brief Inflates the structure's fieldname length
*
* buf must hold at least 8 bytes
* @ingroup mat_internal
* @param mat Pointer to the MAT file
* @param matvar Pointer to the MAT variable
* @param buf Pointer to store the fieldname length
* @return Number of bytes read from the file
*/
int
InflateFieldNameLength(mat_t *mat, matvar_t *matvar, void *buf)
{
mat_uint8_t comp_buf[32];
int bytesread = 0, err;
if ( buf == NULL )
return 0;
if ( !matvar->internal->z->avail_in ) {
matvar->internal->z->avail_in = 1;
matvar->internal->z->next_in = comp_buf;
bytesread += fread(comp_buf,1,1,mat->fp);
}
matvar->internal->z->avail_out = 8;
matvar->internal->z->next_out = buf;
err = inflate(matvar->internal->z,Z_NO_FLUSH);
if ( err != Z_OK ) {
Mat_Critical("InflateFieldNameLength: inflate returned %d",err);
return bytesread;
}
while ( matvar->internal->z->avail_out && !matvar->internal->z->avail_in ) {
matvar->internal->z->avail_in = 1;
matvar->internal->z->next_in = comp_buf;
bytesread += fread(comp_buf,1,1,mat->fp);
err = inflate(matvar->internal->z,Z_NO_FLUSH);
if ( err != Z_OK ) {
Mat_Critical("InflateFieldNameLength: inflate returned %d",err);
return bytesread;
}
}
if ( matvar->internal->z->avail_in ) {
fseek(mat->fp,-(int)matvar->internal->z->avail_in,SEEK_CUR);
bytesread -= matvar->internal->z->avail_in;
matvar->internal->z->avail_in = 0;
}
return bytesread;
}
/** @brief Inflates the structure's fieldname tag
*
* buf must hold at least 8 bytes
* @ingroup mat_internal
* @param mat Pointer to the MAT file
* @param matvar Pointer to the MAT variable
* @param buf Pointer to store the fieldname tag
* @return Number of bytes read from the file
*/
int
InflateFieldNamesTag(mat_t *mat, matvar_t *matvar, void *buf)
{
mat_uint8_t comp_buf[32];
int bytesread = 0, err;
if ( buf == NULL )
return 0;
if ( !matvar->internal->z->avail_in ) {
matvar->internal->z->avail_in = 1;
matvar->internal->z->next_in = comp_buf;
bytesread += fread(comp_buf,1,1,mat->fp);
}
matvar->internal->z->avail_out = 8;
matvar->internal->z->next_out = buf;
err = inflate(matvar->internal->z,Z_NO_FLUSH);
if ( err != Z_OK ) {
Mat_Critical("InflateFieldNamesTag: inflate returned %d",err);
return bytesread;
}
while ( matvar->internal->z->avail_out && !matvar->internal->z->avail_in ) {
matvar->internal->z->avail_in = 1;
matvar->internal->z->next_in = comp_buf;
bytesread += fread(comp_buf,1,1,mat->fp);
err = inflate(matvar->internal->z,Z_NO_FLUSH);
if ( err != Z_OK ) {
Mat_Critical("InflateFieldNamesTag: inflate returned %d",err);
return bytesread;
}
}
if ( matvar->internal->z->avail_in ) {
fseek(mat->fp,-(int)matvar->internal->z->avail_in,SEEK_CUR);
bytesread -= matvar->internal->z->avail_in;
matvar->internal->z->avail_in = 0;
}
return bytesread;
}
/*
* Inflates the structure's fieldname length. buf must hold at least
* nfields*fieldname_length bytes
*/
/** @brief Inflates the structure's fieldnames
*
* buf must hold at least @c nfields * @c fieldname_length bytes
* @ingroup mat_internal
* @param mat Pointer to the MAT file
* @param matvar Pointer to the MAT variable
* @param buf Pointer to store the fieldnames
* @param nfields Number of fields
* @param fieldname_length Maximum length in bytes of each field
* @param padding Number of padding bytes
* @return Number of bytes read from the file
*/
int
InflateFieldNames(mat_t *mat,matvar_t *matvar,void *buf,int nfields,
int fieldname_length,int padding)
{
mat_uint8_t comp_buf[32];
int bytesread = 0, err;
if ( buf == NULL )
return 0;
if ( !matvar->internal->z->avail_in ) {
matvar->internal->z->avail_in = 1;
matvar->internal->z->next_in = comp_buf;
bytesread += fread(comp_buf,1,1,mat->fp);
}
matvar->internal->z->avail_out = nfields*fieldname_length+padding;
matvar->internal->z->next_out = buf;
err = inflate(matvar->internal->z,Z_NO_FLUSH);
if ( err != Z_OK ) {
Mat_Critical("InflateFieldNames: inflate returned %d",err);
return bytesread;
}
while ( matvar->internal->z->avail_out && !matvar->internal->z->avail_in ) {
matvar->internal->z->avail_in = 1;
matvar->internal->z->next_in = comp_buf;
bytesread += fread(comp_buf,1,1,mat->fp);
err = inflate(matvar->internal->z,Z_NO_FLUSH);
if ( err != Z_OK ) {
Mat_Critical("InflateFieldNames: inflate returned %d",err);
return bytesread;
}
}
if ( matvar->internal->z->avail_in ) {
fseek(mat->fp,-(int)matvar->internal->z->avail_in,SEEK_CUR);
bytesread -= matvar->internal->z->avail_in;
matvar->internal->z->avail_in = 0;
}
return bytesread;
}
/** @endcond */
#endif
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