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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* mem.c
*
* Copyright (C) 2023 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "io/mem.h"
#include "compat.h"
#include <stdlib.h>
#include <string.h>
#include <assert.h>
typedef struct {
istream_t base;
sqfs_u8 *buffer;
size_t bufsz;
const void *data;
size_t size;
char *name;
} mem_istream_t;
static int mem_in_precache(istream_t *strm)
{
mem_istream_t *mem = (mem_istream_t *)strm;
size_t diff;
assert(strm->buffer >= mem->buffer);
assert(strm->buffer <= (mem->buffer + mem->bufsz));
assert(strm->buffer_used <= mem->bufsz);
assert((size_t)(strm->buffer - mem->buffer) <=
(mem->bufsz - strm->buffer_used));
if (strm->buffer_used > 0)
memmove(mem->buffer, strm->buffer, strm->buffer_used);
strm->buffer = mem->buffer;
diff = mem->bufsz - strm->buffer_used;
if (diff > mem->size)
diff = mem->size;
if (diff > 0) {
memcpy(mem->buffer + strm->buffer_used, mem->data, diff);
strm->buffer_used += diff;
mem->data = (const char *)mem->data + diff;
mem->size -= diff;
}
if (mem->size == 0)
strm->eof = true;
return 0;
}
static const char *mem_in_get_filename(istream_t *strm)
{
return ((mem_istream_t *)strm)->name;
}
static void mem_in_destroy(sqfs_object_t *obj)
{
free(((mem_istream_t *)obj)->buffer);
free(((mem_istream_t *)obj)->name);
free(obj);
}
istream_t *istream_memory_create(const char *name, size_t bufsz,
const void *data, size_t size)
{
mem_istream_t *mem = calloc(1, sizeof(*mem));
istream_t *strm = (istream_t *)mem;
if (mem == NULL)
return NULL;
sqfs_object_init(mem, mem_in_destroy, NULL);
mem->name = strdup(name);
if (mem->name == NULL)
return sqfs_drop(mem);
mem->buffer = malloc(bufsz);
if (mem->buffer == NULL)
return sqfs_drop(mem);
mem->data = data;
mem->size = size;
mem->bufsz = bufsz;
strm->buffer = mem->buffer;
strm->precache = mem_in_precache;
strm->get_filename = mem_in_get_filename;
return strm;
}
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