53bf5c497f
- Add LICENSES directory - Download additional licenses used - Add .reuse directory - Add doc about SPDX/reuse Co-authored-by: Florian Märkl <info@florianmaerkl.de>
125 lines
2.7 KiB
C
125 lines
2.7 KiB
C
// SPDX-FileCopyrightText: 2017 condret <condr3t@protonmail.com>
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// SPDX-FileCopyrightText: 2017 pancake <pancake@nopcode.org>
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// SPDX-License-Identifier: LGPL-3.0-only
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#include <rz_io.h>
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#include <rz_lib.h>
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typedef struct {
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ut64 size;
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ut64 offset;
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} RzIONull;
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static int __write(RzIO *io, RzIODesc *fd, const ut8 *buf, int count) {
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RzIONull *null;
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if (!fd || !fd->data || !buf) {
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return -1;
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}
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null = (RzIONull *)fd->data;
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if ((null->offset + count) > null->size) {
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int ret = null->size - null->offset;
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return ret;
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}
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null->offset += count;
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return count;
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}
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static bool __resize(RzIO *io, RzIODesc *fd, ut64 count) {
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if (fd && fd->data) {
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RzIONull *null = (RzIONull *)fd->data;
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null->size = count;
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if (null->offset >= count) {
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if (count) {
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null->offset = count - 1;
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} else {
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null->offset = 0LL;
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}
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}
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return true;
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}
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return false;
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}
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static int __read(RzIO *io, RzIODesc *fd, ut8 *buf, int count) {
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RzIONull *null;
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if (!fd || !fd->data || !buf) {
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return -1;
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}
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null = (RzIONull *)fd->data;
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if ((null->offset + count) > null->size) {
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int ret = null->size - null->offset;
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memset(buf, 0x00, ret);
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null->offset = null->size;
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return ret;
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}
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memset(buf, 0x00, count);
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null->offset += count;
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return count;
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}
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static int __close(RzIODesc *fd) {
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RZ_FREE(fd->data);
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return 0;
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}
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static ut64 __lseek(RzIO *io, RzIODesc *fd, ut64 offset, int whence) {
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RzIONull *null;
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if (!fd || !fd->data) {
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return offset;
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}
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null = (RzIONull *)fd->data;
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switch (whence) {
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case SEEK_SET:
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if (offset >= null->size) {
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return null->offset = null->size - 1;
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}
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return null->offset = offset;
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case SEEK_CUR:
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if ((null->offset + offset) >= null->size) {
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return null->offset = null->size - 1;
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}
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return null->offset += offset;
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case SEEK_END:
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return null->offset = null->size - 1;
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}
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return offset;
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}
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static bool __plugin_open(RzIO *io, const char *pathname, bool many) {
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return (!strncmp(pathname, "null://", 7));
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}
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static RzIODesc *__open(RzIO *io, const char *pathname, int rw, int mode) {
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RzIONull *null;
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if (__plugin_open(io, pathname, 0)) {
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if (!strncmp(pathname, "null://", 7) && strlen(pathname + 7)) {
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null = RZ_NEW0(RzIONull);
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null->size = rz_num_math(NULL, pathname + 7) + 1; //???
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null->offset = 0LL;
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return rz_io_desc_new(io, &rz_io_plugin_null, pathname, rw, mode, null);
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}
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}
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return NULL;
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}
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RzIOPlugin rz_io_plugin_null = {
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.name = "null",
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.desc = "Null plugin",
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.license = "LGPL3",
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.uris = "null://",
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.open = __open,
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.close = __close,
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.read = __read,
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.check = __plugin_open,
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.lseek = __lseek,
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.write = __write,
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.resize = __resize,
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};
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#ifndef RZ_PLUGIN_INCORE
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RZ_API RzLibStruct rizin_plugin = {
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.type = RZ_LIB_TYPE_IO,
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.data = &rz_io_plugin_null,
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.version = RZ_VERSION
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};
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#endif
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