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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* istream.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "../internal.h"
typedef struct {
istream_t base;
char *path;
int fd;
sqfs_u8 buffer[BUFSZ];
} file_istream_t;
static int file_precache(istream_t *strm)
{
file_istream_t *file = (file_istream_t *)strm;
ssize_t ret;
size_t diff;
if (strm->buffer_offset >= strm->buffer_used) {
strm->buffer_offset = 0;
strm->buffer_used = 0;
} else if (strm->buffer_offset > 0) {
memmove(strm->buffer,
strm->buffer + strm->buffer_offset,
strm->buffer_used - strm->buffer_offset);
strm->buffer_used -= strm->buffer_offset;
strm->buffer_offset = 0;
}
while (!strm->eof && strm->buffer_used < sizeof(file->buffer)) {
diff = sizeof(file->buffer) - strm->buffer_used;
ret = read(file->fd, strm->buffer + strm->buffer_used, diff);
if (ret == 0)
strm->eof = true;
if (ret < 0) {
if (errno == EINTR)
continue;
perror(file->path);
return -1;
}
strm->buffer_used += ret;
}
return 0;
}
static const char *file_get_filename(istream_t *strm)
{
file_istream_t *file = (file_istream_t *)strm;
return file->path;
}
static void file_destroy(sqfs_object_t *obj)
{
file_istream_t *file = (file_istream_t *)obj;
if (file->fd != STDIN_FILENO)
close(file->fd);
free(file->path);
free(file);
}
istream_t *istream_open_file(const char *path)
{
file_istream_t *file = calloc(1, sizeof(*file));
istream_t *strm = (istream_t *)file;
if (file == NULL) {
perror(path);
return NULL;
}
sqfs_object_init(file, file_destroy, NULL);
file->path = strdup(path);
if (file->path == NULL) {
perror(path);
goto fail_free;
}
file->fd = open(path, O_RDONLY);
if (file->fd < 0) {
perror(path);
goto fail_path;
}
strm->buffer = file->buffer;
strm->precache = file_precache;
strm->get_filename = file_get_filename;
return strm;
fail_path:
free(file->path);
fail_free:
free(file);
return NULL;
}
istream_t *istream_open_stdin(void)
{
file_istream_t *file = calloc(1, sizeof(*file));
istream_t *strm = (istream_t *)file;
if (file == NULL)
goto fail;
sqfs_object_init(file, file_destroy, NULL);
file->path = strdup("stdin");
if (file->path == NULL)
goto fail;
file->fd = STDIN_FILENO;
strm->buffer = file->buffer;
strm->precache = file_precache;
strm->get_filename = file_get_filename;
return strm;
fail:
perror("creating file wrapper for stdin");
free(file);
return NULL;
}
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