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/* Copyright (C) 2018 Curtis McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <wchar.h>
#include "edi.h"
static const char Magic[3] = "EDI";
static const char Version = 1;
static bool writeBuffer(FILE *stream, const struct Buffer *buf) {
size_t len = 0;
const struct Block *block;
for (block = buf->block; block; block = block->prev) {
len += block->len;
}
if (!fwrite(&len, sizeof(len), 1, stream)) return false;
for (block = buf->block; block; block = block->prev) {
fwrite(block->chars, sizeof(wchar_t), block->len, stream);
if (ferror(stream)) return false;
}
return true;
}
static bool writeSlice(
FILE *stream, const struct Buffer *buf, struct Slice slice
) {
size_t offset = 0;
const struct Block *block;
for (block = buf->block; block; offset += block->len, block = block->prev) {
if (
slice.ptr >= block->chars && slice.ptr < &block->chars[block->len]
) break;
}
assert(block);
size_t ptr = offset + (size_t)(slice.ptr - block->chars);
return fwrite(&ptr, sizeof(ptr), 1, stream)
&& fwrite(&slice.len, sizeof(slice.len), 1, stream);
}
static bool writeTable(
FILE *stream, const struct Buffer *buf, const struct Table *table
) {
if (!fwrite(&table->len, sizeof(table->len), 1, stream)) return false;
for (size_t i = 0; i < table->len; ++i) {
if (!writeSlice(stream, buf, table->slices[i])) return false;
}
return true;
}
static bool writeState(
FILE *stream, const struct Buffer *buf, const struct State *state
) {
return fwrite(&state->prev, sizeof(state->prev), 1, stream)
&& fwrite(&state->next, sizeof(state->next), 1, stream)
&& writeTable(stream, buf, &state->table);
}
static bool writeLog(
FILE *stream, const struct Buffer *buf, const struct Log *log
) {
if (!fwrite(&log->state, sizeof(log->state), 1, stream)) return false;
if (!fwrite(&log->len, sizeof(log->len), 1, stream)) return false;
for (size_t i = 0; i < log->len; ++i) {
if (!writeState(stream, buf, &log->states[i])) return false;
}
return true;
}
bool storeWrite(FILE *stream, const struct Edit *edit) {
return fwrite(Magic, sizeof(Magic), 1, stream)
&& fwrite(&Version, sizeof(Version), 1, stream)
&& writeBuffer(stream, &edit->buf)
&& writeLog(stream, &edit->buf, &edit->log);
}
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