08acf54585
* Make rz_buf_read consistent. The IO buffer did not updated its seek after reading. Although most of the others do. The behavior is now documented. * Partially reverse seek on read for IO_FD and FILE buffers. Because it breaks too many tests. * Add type when initializing RzBuffer. * Remove duplicate documentation of RzBuffer read()
92 lines
2.2 KiB
C
92 lines
2.2 KiB
C
// SPDX-FileCopyrightText: 2009-2020 ret2libc <sirmy15@gmail.com>
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// SPDX-License-Identifier: LGPL-3.0-only
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#include <rz_types.h>
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#include <rz_util.h>
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struct buf_file_user {
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const char *file;
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int perm;
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int mode;
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};
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struct buf_file_priv {
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int fd;
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ut8 tmp[8];
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};
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static inline struct buf_file_priv *get_priv_file(RzBuffer *b) {
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struct buf_file_priv *priv = (struct buf_file_priv *)b->priv;
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rz_warn_if_fail(priv);
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return priv;
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}
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static bool buf_file_init(RzBuffer *b, const void *user) {
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const struct buf_file_user *u = (const struct buf_file_user *)user;
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struct buf_file_priv *priv = RZ_NEW0(struct buf_file_priv);
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if (!priv) {
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return false;
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}
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int fd = rz_sys_open(u->file, u->perm, u->mode);
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if (fd == -1) {
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free(priv);
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return false;
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}
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priv->fd = fd;
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b->priv = priv;
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b->fd = priv->fd;
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return true;
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}
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static bool buf_file_fini(RzBuffer *b) {
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struct buf_file_priv *priv = get_priv_file(b);
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close(priv->fd);
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RZ_FREE(b->priv);
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return true;
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}
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static ut64 buf_file_get_size(RzBuffer *b) {
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struct buf_file_priv *priv = get_priv_file(b);
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int pos = lseek(priv->fd, 0, SEEK_CUR);
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int res = lseek(priv->fd, 0, SEEK_END);
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if (pos >= 0) {
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lseek(priv->fd, (off_t)pos, SEEK_SET);
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}
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return (ut64)res;
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}
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static st64 buf_file_read(RZ_BORROW RzBuffer *b, RZ_OUT ut8 *buf, ut64 len) {
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struct buf_file_priv *priv = get_priv_file(b);
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ssize_t result = read(priv->fd, buf, len);
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return result;
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}
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static st64 buf_file_write(RzBuffer *b, const ut8 *buf, ut64 len) {
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struct buf_file_priv *priv = get_priv_file(b);
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return write(priv->fd, buf, len);
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}
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static st64 buf_file_seek(RzBuffer *b, st64 addr, int whence) {
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struct buf_file_priv *priv = get_priv_file(b);
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switch (whence) {
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case RZ_BUF_CUR: whence = SEEK_CUR; break;
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case RZ_BUF_SET: whence = SEEK_SET; break;
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case RZ_BUF_END: whence = SEEK_END; break;
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}
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return lseek(priv->fd, (off_t)addr, whence);
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}
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static bool buf_file_resize(RzBuffer *b, ut64 newsize) {
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struct buf_file_priv *priv = get_priv_file(b);
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return rz_sys_truncate_fd(priv->fd, newsize) >= 0;
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}
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static const RzBufferMethods buffer_file_methods = {
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.init = buf_file_init,
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.fini = buf_file_fini,
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.read = buf_file_read,
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.write = buf_file_write,
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.get_size = buf_file_get_size,
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.resize = buf_file_resize,
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.seek = buf_file_seek,
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};
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