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Merge pull request #2427 from philsmd/fwrite_win_fix

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larger fwrite/fread problem on windows fixed
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Jens Steube 2020-06-02 10:49:37 +02:00 committed by GitHub
commit 46cd7900dc
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1 changed files with 81 additions and 1 deletions
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80
src/filehandling.c
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@ -130,9 +130,49 @@ size_t hc_fread (void *ptr, size_t size, size_t nmemb, HCFILE *fp)
n = unzReadCurrentFile (fp->ufp, ptr, s);
}
else
{
#if defined (_WIN)
// 4 GB fread () limit for windows systems ?
// see: https://social.msdn.microsoft.com/Forums/vstudio/en-US/7c913001-227e-439b-bf07-54369ba07994/fwrite-issues-with-large-data-write
#define GIGABYTE (1024u * 1024u * 1024u)
if (((size * nmemb) / GIGABYTE) < 4)
{
n = fread (ptr, size, nmemb, fp->pfp);
}
else
{
if ((size / GIGABYTE) > 3) return -1;
size_t elements_max = (3u * GIGABYTE) / size;
size_t elements_left = nmemb;
size_t off = 0;
n = 0;
while (elements_left > 0)
{
size_t elements_cur = elements_max;
if (elements_left < elements_max) elements_cur = elements_left;
size_t ret = fread (ptr + off, size, elements_cur, fp->pfp);
if (ret != elements_cur) return -1;
n += ret;
off += ret * size;
elements_left -= ret;
}
}
#else
n = fread (ptr, size, nmemb, fp->pfp);
#endif
}
return n;
}
@ -151,9 +191,49 @@ size_t hc_fwrite (const void *ptr, size_t size, size_t nmemb, HCFILE *fp)
{
}
else
{
#if defined (_WIN)
// 4 GB fwrite () limit for windows systems ?
// see: https://social.msdn.microsoft.com/Forums/vstudio/en-US/7c913001-227e-439b-bf07-54369ba07994/fwrite-issues-with-large-data-write
#define GIGABYTE (1024u * 1024u * 1024u)
if (((size * nmemb) / GIGABYTE) < 4)
{
n = fwrite (ptr, size, nmemb, fp->pfp);
}
else
{
if ((size / GIGABYTE) > 3) return -1;
size_t elements_max = (3u * GIGABYTE) / size;
size_t elements_left = nmemb;
size_t off = 0;
n = 0;
while (elements_left > 0)
{
size_t elements_cur = elements_max;
if (elements_left < elements_max) elements_cur = elements_left;
size_t ret = fwrite (ptr + off, size, elements_cur, fp->pfp);
if (ret != elements_cur) return -1;
n += ret;
off += ret * size;
elements_left -= ret;
}
}
#else
n = fwrite (ptr, size, nmemb, fp->pfp);
#endif
}
if (n != nmemb) return -1;