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use back-patching to simplify binary file writing

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This commit is contained in:
John Wiegley 2004-08-25 02:11:56 -04:00
parent 6febfc3b4c
commit 5b402a26cb
1 changed files with 20 additions and 30 deletions
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50
binary.cc
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@ -9,7 +9,7 @@
namespace ledger {
const unsigned long binary_magic_number = 0xFFEED765;
static const unsigned long format_version = 0x00020017;
static const unsigned long format_version = 0x00020018;
static account_t ** accounts;
static account_t ** accounts_next;
@ -501,33 +501,12 @@ void write_binary_journal(std::ostream& out, journal_t * journal,
write_binary_number<account_t::ident_t>(out, count_accounts(journal->master));
write_binary_account(out, journal->master);
// Calculate some sizes
unsigned long xact_count = 0;
unsigned long string_size = 0;
for (entries_list::const_iterator i = journal->entries.begin();
i != journal->entries.end();
i++) {
string_size += 2 + (*i)->code.length() + (*i)->payee.length();
#if DEBUG_LEVEL >= ALPHA
string_size += 4 * sizeof(unsigned short);
#endif
xact_count += (*i)->transactions.size();
for (transactions_list::const_iterator j = (*i)->transactions.begin();
j != (*i)->transactions.end();
j++) {
string_size += 1 + (*j)->note.length();
#if DEBUG_LEVEL >= ALPHA
string_size += 2 * sizeof(unsigned short);
#endif
}
}
// Write out the string pool
write_binary_number<unsigned long>(out, string_size);
unsigned long xact_count = 0;
std::ostream::pos_type string_pool_val = out.tellp();
write_binary_number<unsigned long>(out, 0);
for (entries_list::const_iterator i = journal->entries.begin();
i != journal->entries.end();
@ -537,21 +516,29 @@ void write_binary_journal(std::ostream& out, journal_t * journal,
for (transactions_list::const_iterator j = (*i)->transactions.begin();
j != (*i)->transactions.end();
j++)
j++) {
xact_count++;
write_binary_string(out, (*j)->note);
}
}
unsigned long string_pool_size = (((unsigned long) out.tellp()) -
((unsigned long) string_pool_val) -
sizeof(unsigned long));
// Write out the number of entries, transactions, and amounts
write_binary_number<unsigned long>(out, journal->entries.size());
write_binary_number<unsigned long>(out, xact_count);
std::ostream::pos_type here = out.tellp();
std::ostream::pos_type bigints_val = out.tellp();
write_binary_number<unsigned long>(out, 0);
bigints_count = 0;
// Write out the commodities
write_binary_number<commodity_t::ident_t>(out, commodity_t::commodities.size() - 1);
write_binary_number<commodity_t::ident_t>
(out, commodity_t::commodities.size() - 1);
for (commodities_map::const_iterator i = commodity_t::commodities.begin();
i != commodity_t::commodities.end();
i++)
@ -567,7 +554,10 @@ void write_binary_journal(std::ostream& out, journal_t * journal,
// Back-patch the count for amounts
out.seekp(here);
out.seekp(string_pool_val);
write_binary_number<unsigned long>(out, string_pool_size);
out.seekp(bigints_val);
write_binary_number<unsigned long>(out, bigints_count);
}