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-rw-r--r--reftable/reader.c816
1 files changed, 816 insertions, 0 deletions
diff --git a/reftable/reader.c b/reftable/reader.c
new file mode 100644
index 0000000..b4db23c
--- /dev/null
+++ b/reftable/reader.c
@@ -0,0 +1,816 @@
+/*
+Copyright 2020 Google LLC
+
+Use of this source code is governed by a BSD-style
+license that can be found in the LICENSE file or at
+https://developers.google.com/open-source/licenses/bsd
+*/
+
+#include "reader.h"
+
+#include "system.h"
+#include "block.h"
+#include "constants.h"
+#include "generic.h"
+#include "iter.h"
+#include "record.h"
+#include "reftable-error.h"
+#include "reftable-generic.h"
+#include "tree.h"
+
+uint64_t block_source_size(struct reftable_block_source *source)
+{
+ return source->ops->size(source->arg);
+}
+
+int block_source_read_block(struct reftable_block_source *source,
+ struct reftable_block *dest, uint64_t off,
+ uint32_t size)
+{
+ int result = source->ops->read_block(source->arg, dest, off, size);
+ dest->source = *source;
+ return result;
+}
+
+void block_source_close(struct reftable_block_source *source)
+{
+ if (!source->ops) {
+ return;
+ }
+
+ source->ops->close(source->arg);
+ source->ops = NULL;
+}
+
+static struct reftable_reader_offsets *
+reader_offsets_for(struct reftable_reader *r, uint8_t typ)
+{
+ switch (typ) {
+ case BLOCK_TYPE_REF:
+ return &r->ref_offsets;
+ case BLOCK_TYPE_LOG:
+ return &r->log_offsets;
+ case BLOCK_TYPE_OBJ:
+ return &r->obj_offsets;
+ }
+ abort();
+}
+
+static int reader_get_block(struct reftable_reader *r,
+ struct reftable_block *dest, uint64_t off,
+ uint32_t sz)
+{
+ if (off >= r->size)
+ return 0;
+
+ if (off + sz > r->size) {
+ sz = r->size - off;
+ }
+
+ return block_source_read_block(&r->source, dest, off, sz);
+}
+
+uint32_t reftable_reader_hash_id(struct reftable_reader *r)
+{
+ return r->hash_id;
+}
+
+const char *reader_name(struct reftable_reader *r)
+{
+ return r->name;
+}
+
+static int parse_footer(struct reftable_reader *r, uint8_t *footer,
+ uint8_t *header)
+{
+ uint8_t *f = footer;
+ uint8_t first_block_typ;
+ int err = 0;
+ uint32_t computed_crc;
+ uint32_t file_crc;
+
+ if (memcmp(f, "REFT", 4)) {
+ err = REFTABLE_FORMAT_ERROR;
+ goto done;
+ }
+ f += 4;
+
+ if (memcmp(footer, header, header_size(r->version))) {
+ err = REFTABLE_FORMAT_ERROR;
+ goto done;
+ }
+
+ f++;
+ r->block_size = get_be24(f);
+
+ f += 3;
+ r->min_update_index = get_be64(f);
+ f += 8;
+ r->max_update_index = get_be64(f);
+ f += 8;
+
+ if (r->version == 1) {
+ r->hash_id = GIT_SHA1_FORMAT_ID;
+ } else {
+ r->hash_id = get_be32(f);
+ switch (r->hash_id) {
+ case GIT_SHA1_FORMAT_ID:
+ break;
+ case GIT_SHA256_FORMAT_ID:
+ break;
+ default:
+ err = REFTABLE_FORMAT_ERROR;
+ goto done;
+ }
+ f += 4;
+ }
+
+ r->ref_offsets.index_offset = get_be64(f);
+ f += 8;
+
+ r->obj_offsets.offset = get_be64(f);
+ f += 8;
+
+ r->object_id_len = r->obj_offsets.offset & ((1 << 5) - 1);
+ r->obj_offsets.offset >>= 5;
+
+ r->obj_offsets.index_offset = get_be64(f);
+ f += 8;
+ r->log_offsets.offset = get_be64(f);
+ f += 8;
+ r->log_offsets.index_offset = get_be64(f);
+ f += 8;
+
+ computed_crc = crc32(0, footer, f - footer);
+ file_crc = get_be32(f);
+ f += 4;
+ if (computed_crc != file_crc) {
+ err = REFTABLE_FORMAT_ERROR;
+ goto done;
+ }
+
+ first_block_typ = header[header_size(r->version)];
+ r->ref_offsets.is_present = (first_block_typ == BLOCK_TYPE_REF);
+ r->ref_offsets.offset = 0;
+ r->log_offsets.is_present = (first_block_typ == BLOCK_TYPE_LOG ||
+ r->log_offsets.offset > 0);
+ r->obj_offsets.is_present = r->obj_offsets.offset > 0;
+ if (r->obj_offsets.is_present && !r->object_id_len) {
+ err = REFTABLE_FORMAT_ERROR;
+ goto done;
+ }
+
+ err = 0;
+done:
+ return err;
+}
+
+int init_reader(struct reftable_reader *r, struct reftable_block_source *source,
+ const char *name)
+{
+ struct reftable_block footer = { NULL };
+ struct reftable_block header = { NULL };
+ int err = 0;
+ uint64_t file_size = block_source_size(source);
+
+ /* Need +1 to read type of first block. */
+ uint32_t read_size = header_size(2) + 1; /* read v2 because it's larger. */
+ memset(r, 0, sizeof(struct reftable_reader));
+
+ if (read_size > file_size) {
+ err = REFTABLE_FORMAT_ERROR;
+ goto done;
+ }
+
+ err = block_source_read_block(source, &header, 0, read_size);
+ if (err != read_size) {
+ err = REFTABLE_IO_ERROR;
+ goto done;
+ }
+
+ if (memcmp(header.data, "REFT", 4)) {
+ err = REFTABLE_FORMAT_ERROR;
+ goto done;
+ }
+ r->version = header.data[4];
+ if (r->version != 1 && r->version != 2) {
+ err = REFTABLE_FORMAT_ERROR;
+ goto done;
+ }
+
+ r->size = file_size - footer_size(r->version);
+ r->source = *source;
+ r->name = xstrdup(name);
+ r->hash_id = 0;
+
+ err = block_source_read_block(source, &footer, r->size,
+ footer_size(r->version));
+ if (err != footer_size(r->version)) {
+ err = REFTABLE_IO_ERROR;
+ goto done;
+ }
+
+ err = parse_footer(r, footer.data, header.data);
+done:
+ reftable_block_done(&footer);
+ reftable_block_done(&header);
+ return err;
+}
+
+struct table_iter {
+ struct reftable_reader *r;
+ uint8_t typ;
+ uint64_t block_off;
+ struct block_iter bi;
+ int is_finished;
+};
+#define TABLE_ITER_INIT \
+ { \
+ .bi = {.last_key = STRBUF_INIT } \
+ }
+
+static void table_iter_copy_from(struct table_iter *dest,
+ struct table_iter *src)
+{
+ dest->r = src->r;
+ dest->typ = src->typ;
+ dest->block_off = src->block_off;
+ dest->is_finished = src->is_finished;
+ block_iter_copy_from(&dest->bi, &src->bi);
+}
+
+static int table_iter_next_in_block(struct table_iter *ti,
+ struct reftable_record *rec)
+{
+ int res = block_iter_next(&ti->bi, rec);
+ if (res == 0 && reftable_record_type(rec) == BLOCK_TYPE_REF) {
+ rec->u.ref.update_index += ti->r->min_update_index;
+ }
+
+ return res;
+}
+
+static void table_iter_block_done(struct table_iter *ti)
+{
+ if (!ti->bi.br) {
+ return;
+ }
+ reftable_block_done(&ti->bi.br->block);
+ FREE_AND_NULL(ti->bi.br);
+
+ ti->bi.last_key.len = 0;
+ ti->bi.next_off = 0;
+}
+
+static int32_t extract_block_size(uint8_t *data, uint8_t *typ, uint64_t off,
+ int version)
+{
+ int32_t result = 0;
+
+ if (off == 0) {
+ data += header_size(version);
+ }
+
+ *typ = data[0];
+ if (reftable_is_block_type(*typ)) {
+ result = get_be24(data + 1);
+ }
+ return result;
+}
+
+int reader_init_block_reader(struct reftable_reader *r, struct block_reader *br,
+ uint64_t next_off, uint8_t want_typ)
+{
+ int32_t guess_block_size = r->block_size ? r->block_size :
+ DEFAULT_BLOCK_SIZE;
+ struct reftable_block block = { NULL };
+ uint8_t block_typ = 0;
+ int err = 0;
+ uint32_t header_off = next_off ? 0 : header_size(r->version);
+ int32_t block_size = 0;
+
+ if (next_off >= r->size)
+ return 1;
+
+ err = reader_get_block(r, &block, next_off, guess_block_size);
+ if (err < 0)
+ goto done;
+
+ block_size = extract_block_size(block.data, &block_typ, next_off,
+ r->version);
+ if (block_size < 0) {
+ err = block_size;
+ goto done;
+ }
+ if (want_typ != BLOCK_TYPE_ANY && block_typ != want_typ) {
+ err = 1;
+ goto done;
+ }
+
+ if (block_size > guess_block_size) {
+ reftable_block_done(&block);
+ err = reader_get_block(r, &block, next_off, block_size);
+ if (err < 0) {
+ goto done;
+ }
+ }
+
+ err = block_reader_init(br, &block, header_off, r->block_size,
+ hash_size(r->hash_id));
+done:
+ reftable_block_done(&block);
+
+ return err;
+}
+
+static int table_iter_next_block(struct table_iter *dest,
+ struct table_iter *src)
+{
+ uint64_t next_block_off = src->block_off + src->bi.br->full_block_size;
+ struct block_reader br = { 0 };
+ int err = 0;
+
+ dest->r = src->r;
+ dest->typ = src->typ;
+ dest->block_off = next_block_off;
+
+ err = reader_init_block_reader(src->r, &br, next_block_off, src->typ);
+ if (err > 0) {
+ dest->is_finished = 1;
+ return 1;
+ }
+ if (err != 0)
+ return err;
+ else {
+ struct block_reader *brp =
+ reftable_malloc(sizeof(struct block_reader));
+ *brp = br;
+
+ dest->is_finished = 0;
+ block_reader_start(brp, &dest->bi);
+ }
+ return 0;
+}
+
+static int table_iter_next(struct table_iter *ti, struct reftable_record *rec)
+{
+ if (reftable_record_type(rec) != ti->typ)
+ return REFTABLE_API_ERROR;
+
+ while (1) {
+ struct table_iter next = TABLE_ITER_INIT;
+ int err = 0;
+ if (ti->is_finished) {
+ return 1;
+ }
+
+ err = table_iter_next_in_block(ti, rec);
+ if (err <= 0) {
+ return err;
+ }
+
+ err = table_iter_next_block(&next, ti);
+ if (err != 0) {
+ ti->is_finished = 1;
+ }
+ table_iter_block_done(ti);
+ if (err != 0) {
+ return err;
+ }
+ table_iter_copy_from(ti, &next);
+ block_iter_close(&next.bi);
+ }
+}
+
+static int table_iter_next_void(void *ti, struct reftable_record *rec)
+{
+ return table_iter_next(ti, rec);
+}
+
+static void table_iter_close(void *p)
+{
+ struct table_iter *ti = p;
+ table_iter_block_done(ti);
+ block_iter_close(&ti->bi);
+}
+
+static struct reftable_iterator_vtable table_iter_vtable = {
+ .next = &table_iter_next_void,
+ .close = &table_iter_close,
+};
+
+static void iterator_from_table_iter(struct reftable_iterator *it,
+ struct table_iter *ti)
+{
+ assert(!it->ops);
+ it->iter_arg = ti;
+ it->ops = &table_iter_vtable;
+}
+
+static int reader_table_iter_at(struct reftable_reader *r,
+ struct table_iter *ti, uint64_t off,
+ uint8_t typ)
+{
+ struct block_reader br = { 0 };
+ struct block_reader *brp = NULL;
+
+ int err = reader_init_block_reader(r, &br, off, typ);
+ if (err != 0)
+ return err;
+
+ brp = reftable_malloc(sizeof(struct block_reader));
+ *brp = br;
+ ti->r = r;
+ ti->typ = block_reader_type(brp);
+ ti->block_off = off;
+ block_reader_start(brp, &ti->bi);
+ return 0;
+}
+
+static int reader_start(struct reftable_reader *r, struct table_iter *ti,
+ uint8_t typ, int index)
+{
+ struct reftable_reader_offsets *offs = reader_offsets_for(r, typ);
+ uint64_t off = offs->offset;
+ if (index) {
+ off = offs->index_offset;
+ if (off == 0) {
+ return 1;
+ }
+ typ = BLOCK_TYPE_INDEX;
+ }
+
+ return reader_table_iter_at(r, ti, off, typ);
+}
+
+static int reader_seek_linear(struct table_iter *ti,
+ struct reftable_record *want)
+{
+ struct reftable_record rec =
+ reftable_new_record(reftable_record_type(want));
+ struct strbuf want_key = STRBUF_INIT;
+ struct strbuf got_key = STRBUF_INIT;
+ struct table_iter next = TABLE_ITER_INIT;
+ int err = -1;
+
+ reftable_record_key(want, &want_key);
+
+ while (1) {
+ err = table_iter_next_block(&next, ti);
+ if (err < 0)
+ goto done;
+
+ if (err > 0) {
+ break;
+ }
+
+ err = block_reader_first_key(next.bi.br, &got_key);
+ if (err < 0)
+ goto done;
+
+ if (strbuf_cmp(&got_key, &want_key) > 0) {
+ table_iter_block_done(&next);
+ break;
+ }
+
+ table_iter_block_done(ti);
+ table_iter_copy_from(ti, &next);
+ }
+
+ err = block_iter_seek(&ti->bi, &want_key);
+ if (err < 0)
+ goto done;
+ err = 0;
+
+done:
+ block_iter_close(&next.bi);
+ reftable_record_release(&rec);
+ strbuf_release(&want_key);
+ strbuf_release(&got_key);
+ return err;
+}
+
+static int reader_seek_indexed(struct reftable_reader *r,
+ struct reftable_iterator *it,
+ struct reftable_record *rec)
+{
+ struct reftable_record want_index = {
+ .type = BLOCK_TYPE_INDEX, .u.idx = { .last_key = STRBUF_INIT }
+ };
+ struct reftable_record index_result = {
+ .type = BLOCK_TYPE_INDEX,
+ .u.idx = { .last_key = STRBUF_INIT },
+ };
+ struct table_iter index_iter = TABLE_ITER_INIT;
+ struct table_iter next = TABLE_ITER_INIT;
+ int err = 0;
+
+ reftable_record_key(rec, &want_index.u.idx.last_key);
+ err = reader_start(r, &index_iter, reftable_record_type(rec), 1);
+ if (err < 0)
+ goto done;
+
+ err = reader_seek_linear(&index_iter, &want_index);
+ while (1) {
+ err = table_iter_next(&index_iter, &index_result);
+ table_iter_block_done(&index_iter);
+ if (err != 0)
+ goto done;
+
+ err = reader_table_iter_at(r, &next, index_result.u.idx.offset,
+ 0);
+ if (err != 0)
+ goto done;
+
+ err = block_iter_seek(&next.bi, &want_index.u.idx.last_key);
+ if (err < 0)
+ goto done;
+
+ if (next.typ == reftable_record_type(rec)) {
+ err = 0;
+ break;
+ }
+
+ if (next.typ != BLOCK_TYPE_INDEX) {
+ err = REFTABLE_FORMAT_ERROR;
+ break;
+ }
+
+ table_iter_copy_from(&index_iter, &next);
+ }
+
+ if (err == 0) {
+ struct table_iter empty = TABLE_ITER_INIT;
+ struct table_iter *malloced =
+ reftable_calloc(sizeof(struct table_iter));
+ *malloced = empty;
+ table_iter_copy_from(malloced, &next);
+ iterator_from_table_iter(it, malloced);
+ }
+done:
+ block_iter_close(&next.bi);
+ table_iter_close(&index_iter);
+ reftable_record_release(&want_index);
+ reftable_record_release(&index_result);
+ return err;
+}
+
+static int reader_seek_internal(struct reftable_reader *r,
+ struct reftable_iterator *it,
+ struct reftable_record *rec)
+{
+ struct reftable_reader_offsets *offs =
+ reader_offsets_for(r, reftable_record_type(rec));
+ uint64_t idx = offs->index_offset;
+ struct table_iter ti = TABLE_ITER_INIT;
+ int err = 0;
+ if (idx > 0)
+ return reader_seek_indexed(r, it, rec);
+
+ err = reader_start(r, &ti, reftable_record_type(rec), 0);
+ if (err < 0)
+ return err;
+ err = reader_seek_linear(&ti, rec);
+ if (err < 0)
+ return err;
+ else {
+ struct table_iter *p =
+ reftable_malloc(sizeof(struct table_iter));
+ *p = ti;
+ iterator_from_table_iter(it, p);
+ }
+
+ return 0;
+}
+
+static int reader_seek(struct reftable_reader *r, struct reftable_iterator *it,
+ struct reftable_record *rec)
+{
+ uint8_t typ = reftable_record_type(rec);
+
+ struct reftable_reader_offsets *offs = reader_offsets_for(r, typ);
+ if (!offs->is_present) {
+ iterator_set_empty(it);
+ return 0;
+ }
+
+ return reader_seek_internal(r, it, rec);
+}
+
+int reftable_reader_seek_ref(struct reftable_reader *r,
+ struct reftable_iterator *it, const char *name)
+{
+ struct reftable_record rec = {
+ .type = BLOCK_TYPE_REF,
+ .u.ref = {
+ .refname = (char *)name,
+ },
+ };
+ return reader_seek(r, it, &rec);
+}
+
+int reftable_reader_seek_log_at(struct reftable_reader *r,
+ struct reftable_iterator *it, const char *name,
+ uint64_t update_index)
+{
+ struct reftable_record rec = { .type = BLOCK_TYPE_LOG,
+ .u.log = {
+ .refname = (char *)name,
+ .update_index = update_index,
+ } };
+ return reader_seek(r, it, &rec);
+}
+
+int reftable_reader_seek_log(struct reftable_reader *r,
+ struct reftable_iterator *it, const char *name)
+{
+ uint64_t max = ~((uint64_t)0);
+ return reftable_reader_seek_log_at(r, it, name, max);
+}
+
+void reader_close(struct reftable_reader *r)
+{
+ block_source_close(&r->source);
+ FREE_AND_NULL(r->name);
+}
+
+int reftable_new_reader(struct reftable_reader **p,
+ struct reftable_block_source *src, char const *name)
+{
+ struct reftable_reader *rd =
+ reftable_calloc(sizeof(struct reftable_reader));
+ int err = init_reader(rd, src, name);
+ if (err == 0) {
+ *p = rd;
+ } else {
+ block_source_close(src);
+ reftable_free(rd);
+ }
+ return err;
+}
+
+void reftable_reader_free(struct reftable_reader *r)
+{
+ if (!r)
+ return;
+ reader_close(r);
+ reftable_free(r);
+}
+
+static int reftable_reader_refs_for_indexed(struct reftable_reader *r,
+ struct reftable_iterator *it,
+ uint8_t *oid)
+{
+ struct reftable_record want = {
+ .type = BLOCK_TYPE_OBJ,
+ .u.obj = {
+ .hash_prefix = oid,
+ .hash_prefix_len = r->object_id_len,
+ },
+ };
+ struct reftable_iterator oit = { NULL };
+ struct reftable_record got = {
+ .type = BLOCK_TYPE_OBJ,
+ .u.obj = { 0 },
+ };
+ int err = 0;
+ struct indexed_table_ref_iter *itr = NULL;
+
+ /* Look through the reverse index. */
+ err = reader_seek(r, &oit, &want);
+ if (err != 0)
+ goto done;
+
+ /* read out the reftable_obj_record */
+ err = iterator_next(&oit, &got);
+ if (err < 0)
+ goto done;
+
+ if (err > 0 || memcmp(want.u.obj.hash_prefix, got.u.obj.hash_prefix,
+ r->object_id_len)) {
+ /* didn't find it; return empty iterator */
+ iterator_set_empty(it);
+ err = 0;
+ goto done;
+ }
+
+ err = new_indexed_table_ref_iter(&itr, r, oid, hash_size(r->hash_id),
+ got.u.obj.offsets,
+ got.u.obj.offset_len);
+ if (err < 0)
+ goto done;
+ got.u.obj.offsets = NULL;
+ iterator_from_indexed_table_ref_iter(it, itr);
+
+done:
+ reftable_iterator_destroy(&oit);
+ reftable_record_release(&got);
+ return err;
+}
+
+static int reftable_reader_refs_for_unindexed(struct reftable_reader *r,
+ struct reftable_iterator *it,
+ uint8_t *oid)
+{
+ struct table_iter ti_empty = TABLE_ITER_INIT;
+ struct table_iter *ti = reftable_calloc(sizeof(struct table_iter));
+ struct filtering_ref_iterator *filter = NULL;
+ struct filtering_ref_iterator empty = FILTERING_REF_ITERATOR_INIT;
+ int oid_len = hash_size(r->hash_id);
+ int err;
+
+ *ti = ti_empty;
+ err = reader_start(r, ti, BLOCK_TYPE_REF, 0);
+ if (err < 0) {
+ reftable_free(ti);
+ return err;
+ }
+
+ filter = reftable_malloc(sizeof(struct filtering_ref_iterator));
+ *filter = empty;
+
+ strbuf_add(&filter->oid, oid, oid_len);
+ reftable_table_from_reader(&filter->tab, r);
+ filter->double_check = 0;
+ iterator_from_table_iter(&filter->it, ti);
+
+ iterator_from_filtering_ref_iterator(it, filter);
+ return 0;
+}
+
+int reftable_reader_refs_for(struct reftable_reader *r,
+ struct reftable_iterator *it, uint8_t *oid)
+{
+ if (r->obj_offsets.is_present)
+ return reftable_reader_refs_for_indexed(r, it, oid);
+ return reftable_reader_refs_for_unindexed(r, it, oid);
+}
+
+uint64_t reftable_reader_max_update_index(struct reftable_reader *r)
+{
+ return r->max_update_index;
+}
+
+uint64_t reftable_reader_min_update_index(struct reftable_reader *r)
+{
+ return r->min_update_index;
+}
+
+/* generic table interface. */
+
+static int reftable_reader_seek_void(void *tab, struct reftable_iterator *it,
+ struct reftable_record *rec)
+{
+ return reader_seek(tab, it, rec);
+}
+
+static uint32_t reftable_reader_hash_id_void(void *tab)
+{
+ return reftable_reader_hash_id(tab);
+}
+
+static uint64_t reftable_reader_min_update_index_void(void *tab)
+{
+ return reftable_reader_min_update_index(tab);
+}
+
+static uint64_t reftable_reader_max_update_index_void(void *tab)
+{
+ return reftable_reader_max_update_index(tab);
+}
+
+static struct reftable_table_vtable reader_vtable = {
+ .seek_record = reftable_reader_seek_void,
+ .hash_id = reftable_reader_hash_id_void,
+ .min_update_index = reftable_reader_min_update_index_void,
+ .max_update_index = reftable_reader_max_update_index_void,
+};
+
+void reftable_table_from_reader(struct reftable_table *tab,
+ struct reftable_reader *reader)
+{
+ assert(!tab->ops);
+ tab->ops = &reader_vtable;
+ tab->table_arg = reader;
+}
+
+
+int reftable_reader_print_file(const char *tablename)
+{
+ struct reftable_block_source src = { NULL };
+ int err = reftable_block_source_from_file(&src, tablename);
+ struct reftable_reader *r = NULL;
+ struct reftable_table tab = { NULL };
+ if (err < 0)
+ goto done;
+
+ err = reftable_new_reader(&r, &src, tablename);
+ if (err < 0)
+ goto done;
+
+ reftable_table_from_reader(&tab, r);
+ err = reftable_table_print(&tab);
+done:
+ reftable_reader_free(r);
+ return err;
+}