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Avoid seeking when reading Android timezone identifier 'file'

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This commit is contained in:
Marc-André Moreau 2021-05-26 16:11:11 -04:00 committed by akallabeth
parent 0029f6cc1d
commit af08701c10
1 changed files with 27 additions and 20 deletions
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47
winpr/libwinpr/timezone/timezone.c
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@ -53,35 +53,42 @@ static UINT64 winpr_windows_gmtime(void)
static char* winpr_read_unix_timezone_identifier_from_file(FILE* fp)
{
INT64 length;
char* tzid = NULL;
if (_fseeki64(fp, 0, SEEK_END) != 0)
return NULL;
length = _ftelli64(fp);
if (_fseeki64(fp, 0, SEEK_SET) != 0)
return NULL;
if (length < 2)
return NULL;
tzid = (char*)malloc((size_t)length + 1);
const INT CHUNK_SIZE = 32;
INT64 rc, read = 0, length = CHUNK_SIZE;
char *tmp, *tzid = NULL;
tzid = (char*)malloc(length);
if (!tzid)
return NULL;
if (fread(tzid, (size_t)length, 1, fp) != 1)
do
{
rc = fread(tzid + read, 1, length - read - 1, fp);
read += rc;
if (read < (length - 1))
break;
length += CHUNK_SIZE;
tmp = (char*)realloc(tzid, length);
if (!tmp)
{
free(tzid);
return NULL;
}
tzid = tmp;
} while (rc > 0);
if (ferror(fp))
{
free(tzid);
return NULL;
}
tzid[length] = '\0';
if (tzid[length - 1] == '\n')
tzid[length - 1] = '\0';
tzid[read] = '\0';
if (tzid[read - 1] == '\n')
tzid[read - 1] = '\0';
return tzid;
}