Add missing files.
git-svn-id: svn://localhost/ardour2/branches/3.0@8263 d708f5d6-7413-0410-9779-e7cbd77b26cf
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libs/ardour/lv2_pfile.c
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183
libs/ardour/lv2_pfile.c
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/* Portable file-based implementation of LV2 Persist.
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* See <http://lv2plug.in/ns/ext/persist> for details.
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* Copyright (C) 2010 David Robillard <http://drobilla.net>
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*
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* This file is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This file is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this file; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <assert.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "lv2_pfile.h"
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struct _LV2PFile {
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FILE* fd;
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};
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LV2PFile
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lv2_pfile_open(const char* path, bool write)
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{
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FILE* fd = fopen(path, (write ? "w" : "r"));
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if (!fd) {
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fprintf(stderr, strerror(errno));
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return NULL;
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}
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static const char* const magic = "LV2PFILE";
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static const size_t magic_len = 8;
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if (write) {
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fwrite(magic, magic_len, 1, fd);
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} else {
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char file_magic[magic_len];
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if (fread(file_magic, magic_len, 1, fd) != 1
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|| strncmp(file_magic, magic, magic_len)) {
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fclose(fd);
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return NULL;
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}
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}
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LV2PFile ret = (LV2PFile)malloc(sizeof(LV2PFile));
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ret->fd = fd;
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return ret;
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}
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LV2PFileStatus
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lv2_pfile_write(LV2PFile file,
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const char* key,
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const void* value,
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uint64_t size,
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const char* type)
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{
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#define WRITE(ptr, size, nmemb, stream) \
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if (fwrite(ptr, size, nmemb, stream) != nmemb) { \
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return LV2_PFILE_UNKNOWN_ERROR; \
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}
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const uint32_t key_len = strlen(key);
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WRITE(&key_len, sizeof(key_len), 1, file->fd);
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WRITE(key, key_len + 1, 1, file->fd);
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const uint32_t type_len = strlen(type);
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WRITE(&type_len, sizeof(type_len), 1, file->fd);
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WRITE(type, type_len + 1, 1, file->fd);
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WRITE(&size, sizeof(size), 1, file->fd);
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WRITE(value, size, 1, file->fd);
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return LV2_PFILE_OK;
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}
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LV2PFileStatus
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lv2_pfile_read(LV2PFile file,
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char** key,
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uint32_t* key_len,
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char** type,
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uint32_t* type_len,
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void** value,
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uint64_t* size)
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{
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if (feof(file->fd))
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return LV2_PFILE_EOF;
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#define READ(ptr, size, nmemb, stream) \
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if (fread(ptr, size, nmemb, stream) != nmemb) { \
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assert(false); \
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return LV2_PFILE_CORRUPT; \
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}
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READ(key_len, sizeof(*key_len), 1, file->fd);
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*key = (char*)malloc(*key_len + 1);
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READ(*key, *key_len + 1, 1, file->fd);
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READ(type_len, sizeof(*type_len), 1, file->fd);
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*type = (char*)malloc(*type_len + 1);
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READ(*type, *type_len + 1, 1, file->fd);
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READ(size, sizeof(*size), 1, file->fd);
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*value = malloc(*size);
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READ(*value, *size, 1, file->fd);
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return LV2_PFILE_OK;
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}
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void
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lv2_pfile_close(LV2PFile file)
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{
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if (file)
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fclose(file->fd);
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free(file);
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}
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#ifdef STANDALONE
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// Test program
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int
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main(int argc, char** argv)
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{
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if (argc != 2) {
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fprintf(stderr, "Usage: %s FILENAME\n", argv[0]);
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return 1;
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}
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const char* const filename = argv[1];
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LV2PFile file = lv2_pfile_open(filename, true);
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if (!file)
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goto fail;
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char wkey[6];
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char wval[6];
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const char* wtype = "http://example.org/type";
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#define NUM_RECORDS 32
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for (int i = 0; i < NUM_RECORDS; ++i) {
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snprintf(wkey, sizeof(wkey), "KEY%02d", i);
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snprintf(wval, sizeof(wval), "VAL%02d", i);
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lv2_pfile_write(file, wkey, wval, strlen(wval) + 1, wtype);
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}
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lv2_pfile_close(file);
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file = lv2_pfile_open(filename, false);
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if (!file)
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goto fail;
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char* rkey;
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uint32_t rkey_len;
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char* rtype;
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uint32_t rtype_len;
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uint64_t rsize;
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void* rval;
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for (int i = 0; i < NUM_RECORDS; ++i) {
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if (lv2_pfile_read(file, &rkey, &rkey_len, &rtype, &rtype_len, &rval, &rsize))
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goto fail;
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printf("%s = %s :: %s\n", rkey, (char*)rval, rtype);
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free(rkey);
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free(rtype);
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free(rval);
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}
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lv2_pfile_close(file);
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return 0;
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fail:
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lv2_pfile_close(file);
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fprintf(stderr, "Test failed\n");
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return 1;
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}
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#endif // STANDALONE
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68
libs/ardour/lv2_pfile.h
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68
libs/ardour/lv2_pfile.h
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@ -0,0 +1,68 @@
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/* Portable file-based implementation of LV2 Persist.
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* See <http://lv2plug.in/ns/ext/persist> for details.
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*
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* This file is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This file is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this file; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <stdbool.h>
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct _LV2PFile* LV2PFile;
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typedef struct _LV2PFile_Iterator* LV2PFile_Iterator;
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typedef enum {
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LV2_PFILE_OK = 0,
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LV2_PFILE_UNKNOWN_ERROR = 1,
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LV2_PFILE_EOF = 2,
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LV2_PFILE_CORRUPT = 3
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} LV2PFileStatus;
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/** Open/Create a new persist file. */
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LV2PFile
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lv2_pfile_open(const char* path, bool write);
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/** Write a record to a persist file. */
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LV2PFileStatus
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lv2_pfile_write(LV2PFile file,
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const char* key,
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const void* value,
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uint64_t size,
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const char* type);
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/** Read a record from a persist file.
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* @a key and @a value are allocated with malloc and must be freed by caller.
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*/
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LV2PFileStatus
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lv2_pfile_read(LV2PFile file,
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char** key,
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uint32_t* key_len,
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char** type,
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uint32_t* type_len,
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void** value,
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uint64_t* size);
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/** Close a persist file.
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* After this call, @a file is invalid.
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*/
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void
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lv2_pfile_close(LV2PFile file);
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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