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fix stl filesize computation for >2gb files (see https://github.com/cnr-isti-vclab/meshlab/issues/924)

This commit is contained in:
alemuntoni 2021-03-02 14:25:30 +01:00
parent e292f0cc9b
commit fed787ebb9
1 changed files with 7 additions and 6 deletions
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13
wrap/io_trimesh/import_stl.h
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@ -24,7 +24,7 @@
#ifndef __VCGLIB_IMPORT_STL
#define __VCGLIB_IMPORT_STL
#include <stdio.h>
#include<algorithm>
#include <algorithm>
#include <wrap/io_trimesh/io_mask.h>
namespace vcg {
@ -153,13 +153,13 @@ static bool IsSTLBinary(const char * filename, bool &binaryFlag)
FILE *fp = fopen(filename, "rb");
/* Find size of file */
fseek(fp, 0, SEEK_END);
long file_size = ftell(fp);
unsigned long file_size = ftell(fp);
unsigned int facenum;
/* Check for binary or ASCII file */
fseek(fp, STL_LABEL_SIZE, SEEK_SET);
fread(&facenum, sizeof(unsigned int), 1, fp);
long expected_file_size=STL_LABEL_SIZE + 4 + (sizeof(short)+sizeof(STLFacet) )*facenum ;
unsigned long expected_file_size=STL_LABEL_SIZE + 4 + (sizeof(short)+sizeof(STLFacet) )*facenum ;
if(file_size == expected_file_size)
{
binaryFlag = true;
@ -169,15 +169,16 @@ static bool IsSTLBinary(const char * filename, bool &binaryFlag)
// second check, sometimes the size is a bit wrong,
// lets'make a test to check that we find only ascii stuff before assuming it is ascii
unsigned char tmpbuf[1000];
int byte_to_read = std::min(int(sizeof(tmpbuf)), int(file_size - 80));
unsigned long byte_to_read = std::min(sizeof(tmpbuf), file_size - 80);
fread(tmpbuf, byte_to_read,1,fp);
fclose(fp);
for(int i = 0; i < byte_to_read; i++)
for(unsigned long i = 0; i < byte_to_read; i++)
{
if(tmpbuf[i] > 127)
{
binaryFlag=true;
if(abs(file_size-expected_file_size) > file_size/20 )
unsigned long diff = (file_size > expected_file_size) ? file_size-expected_file_size : expected_file_size-file_size;
if(diff > file_size/20 )
return false; //
break;
}