diff options
Diffstat (limited to 'bin/edi/store.c')
-rw-r--r-- | bin/edi/store.c | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/bin/edi/store.c b/bin/edi/store.c new file mode 100644 index 00000000..f116600a --- /dev/null +++ b/bin/edi/store.c @@ -0,0 +1,92 @@ +/* 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); +} |