int lws_alloc_vfs_file(struct lws_context *context, const char *filename, uint8_t **buf,
lws_filepos_t *amount)
{
lws_filepos_t len;
lws_fop_flags_t flags = LWS_O_RDONLY;
lws_fop_fd_t fops_fd = lws_vfs_file_open(
lws_get_fops(context), filename, &flags);
int ret = 1;
if (!fops_fd)
return 1;
len = lws_vfs_get_length(fops_fd);
*buf = lws_malloc((size_t)len, "lws_alloc_vfs_file");
if (!*buf)
goto bail;
if (lws_vfs_file_read(fops_fd, amount, *buf, len))
goto bail;
ret = 0;
bail:
lws_vfs_file_close(&fops_fd);
return ret;
}
int
lws_fops_zip_scan(lws_fops_zip_t priv, const char *name, int len)
{
lws_filepos_t amount;
uint8_t buf[96];
int i;
if (lws_vfs_file_seek_end(priv->zip_fop_fd, -ZE_DIRECTORY_LENGTH) < 0)
return LWS_FZ_ERR_SEEK_END_RECORD;
if (lws_vfs_file_read(priv->zip_fop_fd, &amount, buf,
ZE_DIRECTORY_LENGTH))
return LWS_FZ_ERR_READ_END_RECORD;
if (amount != ZE_DIRECTORY_LENGTH)
return LWS_FZ_ERR_READ_END_RECORD;
/*
* We require the zip to have the last record right at the end
* Linux zip always does this if no zip comment.
*/
if (buf[0] != 'P' || buf[1] != 'K' || buf[2] != 5 || buf[3] != 6)
return LWS_FZ_ERR_END_RECORD_MAGIC;
i = get_u16(buf + ZE_NUM_ENTRIES);
if (get_u16(buf + ZE_DESK_NUMBER) ||
get_u16(buf + ZE_CENTRAL_DIRECTORY_DISK_NUMBER) ||
i != get_u16(buf + ZE_NUM_ENTRIES_THIS_DISK))
return LWS_FZ_ERR_END_RECORD_SANITY;
/* end record is OK... look for our file in the central dir */
if (lws_vfs_file_seek_set(priv->zip_fop_fd,
get_u32(buf + ZE_CENTRAL_DIR_OFFSET)) < 0)
return LWS_FZ_ERR_CENTRAL_SEEK;
while (i--) {
priv->content_start = lws_vfs_tell(priv->zip_fop_fd);
if (lws_vfs_file_read(priv->zip_fop_fd, &amount, buf,
ZC_DIRECTORY_LENGTH))
return LWS_FZ_ERR_CENTRAL_READ;
if (amount != ZC_DIRECTORY_LENGTH)
return LWS_FZ_ERR_CENTRAL_READ;
if (get_u32(buf + ZC_SIGNATURE) != 0x02014B50)
return LWS_FZ_ERR_CENTRAL_SANITY;
lwsl_debug("cstart 0x%lx\n", (unsigned long)priv->content_start);
priv->hdr.filename_len = get_u16(buf + ZC_FILE_NAME_LENGTH);
priv->hdr.extra = get_u16(buf + ZC_EXTRA_FIELD_LENGTH);
priv->hdr.filename_start = lws_vfs_tell(priv->zip_fop_fd);
priv->hdr.method = get_u16(buf + ZC_COMPRESSION_METHOD);
priv->hdr.crc32 = get_u32(buf + ZC_CRC32);
priv->hdr.comp_size = get_u32(buf + ZC_COMPRESSED_SIZE);
priv->hdr.uncomp_size = get_u32(buf + ZC_UNCOMPRESSED_SIZE);
priv->hdr.offset = get_u32(buf + ZC_REL_OFFSET_LOCAL_HEADER);
priv->hdr.mod_time = get_u32(buf + ZC_LAST_MOD_FILE_TIME);
priv->hdr.file_com_len = get_u16(buf + ZC_FILE_COMMENT_LENGTH);
if (priv->hdr.filename_len != len)
goto next;
if (len >= (int)sizeof(buf) - 1)
return LWS_FZ_ERR_NAME_TOO_LONG;
if (priv->zip_fop_fd->fops->LWS_FOP_READ(priv->zip_fop_fd,
&amount, buf, len))
return LWS_FZ_ERR_NAME_READ;
if ((int)amount != len)
return LWS_FZ_ERR_NAME_READ;
buf[len] = '\0';
lwsl_debug("check %s vs %s\n", buf, name);
if (strcmp((const char *)buf, name))
goto next;
/* we found a match */
if (lws_vfs_file_seek_set(priv->zip_fop_fd, priv->hdr.offset) < 0)
return LWS_FZ_ERR_NAME_SEEK;
if (priv->zip_fop_fd->fops->LWS_FOP_READ(priv->zip_fop_fd,
&amount, buf,
ZL_HEADER_LENGTH))
return LWS_FZ_ERR_NAME_READ;
if (amount != ZL_HEADER_LENGTH)
return LWS_FZ_ERR_NAME_READ;
priv->content_start = priv->hdr.offset +
ZL_HEADER_LENGTH +
priv->hdr.filename_len +
get_u16(buf + ZL_REL_OFFSET_CONTENT);
lwsl_debug("content supposed to start at 0x%lx\n",
(unsigned long)priv->content_start);
if (priv->content_start > priv->zip_fop_fd->len)
return LWS_FZ_ERR_CONTENT_SANITY;
if (lws_vfs_file_seek_set(priv->zip_fop_fd,
priv->content_start) < 0)
return LWS_FZ_ERR_CONTENT_SEEK;
/* we are aligned at the start of the content */
priv->exp_uncomp_pos = 0;
return 0;
next:
if (i && lws_vfs_file_seek_set(priv->zip_fop_fd,
priv->content_start +
ZC_DIRECTORY_LENGTH +
priv->hdr.filename_len +
priv->hdr.extra +
priv->hdr.file_com_len) < 0)
return LWS_FZ_ERR_SCAN_SEEK;
}
return LWS_FZ_ERR_NOT_FOUND;
}
