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/* zlib-extra.c - Extra or enhanced routines for compressed I/O.
*
* Copyright (c) 2014 David Bremner
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://www.gnu.org/licenses/ .
*
* Author: David Bremner <david@tethera.net>
*/
#include "zlib-extra.h"
#include <talloc.h>
#include <stdio.h>
#include <string.h>
/* mimic POSIX/glibc getline, but on a zlib gzFile stream, and using talloc */
util_status_t
gz_getline (void *talloc_ctx, char **bufptr, ssize_t *bytes_read, gzFile stream)
{
char *buf = *bufptr;
unsigned int len;
size_t offset = 0;
if (buf) {
len = talloc_array_length (buf);
} else {
/* same as getdelim from gnulib */
len = 120;
buf = talloc_array (talloc_ctx, char, len);
if (buf == NULL)
return UTIL_OUT_OF_MEMORY;
}
while (1) {
if (! gzgets (stream, buf + offset, len - offset)) {
/* Null indicates EOF or error */
int zlib_status = 0;
(void) gzerror (stream, &zlib_status);
switch (zlib_status) {
case Z_OK:
/* no data read before EOF */
if (offset == 0)
return UTIL_EOF;
else
goto SUCCESS;
case Z_ERRNO:
return UTIL_ERRNO;
default:
return UTIL_GZERROR;
}
}
offset += strlen (buf + offset);
if (buf[offset - 1] == '\n')
goto SUCCESS;
len *= 2;
buf = talloc_realloc (talloc_ctx, buf, char, len);
if (buf == NULL)
return UTIL_OUT_OF_MEMORY;
}
SUCCESS:
*bufptr = buf;
*bytes_read = offset;
return UTIL_SUCCESS;
}
const char *gz_error_string (util_status_t status, gzFile file)
{
if (status == UTIL_GZERROR)
return gzerror (file, NULL);
else
return util_error_string (status);
}
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