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/* This file is part of "reprepro"
* Copyright (C) 2007 Bernhard R. Link
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02111-1301 USA
*/
#include <config.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include "error.h"
#include "names.h"
#include "chunks.h"
#include "readtextfile.h"
/* This file supplies code to read a text file (.changes, .dsc, Release, ...)
* into a chunk, warning if it is too long or if it contains binary data */
static bool isbinarydata(const char *buffer, size_t len, const char *source) {
size_t i;
unsigned char c;
for (i = 0 ; i < len ; i++) {
c = (unsigned char)buffer[i];
if (c < ' ' && c != '\t' && c != '\n' && c != '\r') {
fprintf(stderr,
"Unexpected binary character \\%03hho in %s\n",
c, source);
return true;
}
}
return false;
}
retvalue readtextfilefd(int fd, const char *source, char **data, size_t *len) {
size_t buffersize = 102400, readdata = 0;
ssize_t readbytes;
char *buffer, *h;
buffer = malloc(buffersize);
if (FAILEDTOALLOC(buffer))
return RET_ERROR_OOM;
errno = 0;
while ((readbytes = read(fd, buffer + readdata, buffersize-readdata))
> 0) {
/* text files are normally small, so it does not hurt to check
* the whole of them always */
if (isbinarydata(buffer + readdata, (size_t)readbytes, source)) {
free(buffer);
return RET_ERROR;
}
readdata += readbytes;
assert (readdata <= buffersize);
if (readdata + 1024 >= buffersize) {
if (buffersize >= 10*1024*1024) {
fprintf(stderr, "Ridiculously large %s\n", source);
free(buffer);
return RET_ERROR;
}
buffersize += 51200;
h = realloc(buffer, buffersize);
if (FAILEDTOALLOC(h)) {
free(buffer);
return RET_ERROR_OOM;
}
buffer = h;
}
}
if (readbytes < 0) {
int e = errno;
free(buffer);
fprintf(stderr, "Error reading %s: %s\n", source,
strerror(e));
return RET_ERRNO(e);
}
h = realloc(buffer, readdata + 1);
if (h == NULL) {
#ifdef SPLINT
h = NULL;
#endif
if (readdata >= buffersize) {
free(buffer);
return RET_ERROR_OOM;
}
} else
buffer = h;
buffer[readdata] = '\0';
*data = buffer;
if (len != NULL)
*len = readdata;
return RET_OK;
}
retvalue readtextfile(const char *source, const char *sourcetoshow, char **data, size_t *len) {
int fd; char *buffer; size_t bufferlen;
retvalue r;
int ret;
fd = open(source, O_RDONLY|O_NOCTTY);
if (fd < 0) {
int e = errno;
fprintf(stderr, "Error opening '%s': %s\n",
sourcetoshow, strerror(e));
return RET_ERRNO(e);
}
r = readtextfilefd(fd, sourcetoshow, &buffer, &bufferlen);
if (!RET_IS_OK(r)) {
(void)close(fd);
return r;
}
ret = close(fd);
if (ret != 0) {
int e = errno;
free(buffer);
fprintf(stderr, "Error reading %s: %s\n", sourcetoshow,
strerror(e));
return RET_ERRNO(e);
}
*data = buffer;
if (len != NULL)
*len = bufferlen;
return RET_OK;
}
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