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