mirror of https://github.com/pret/pokecrystal.git
55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
#include "proto.h"
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noreturn error_exit (int error_code, const char * error, ...) {
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va_list ap;
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va_start(ap, error);
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fputs("error: ", stderr);
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vfprintf(stderr, error, ap);
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va_end(ap);
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fputc('\n', stderr);
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exit(error_code);
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}
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unsigned char * read_file_into_buffer (const char * file, unsigned short * size) {
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FILE * fp = file ? fopen(file, "rb") : stdin;
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if (!fp) error_exit(1, "could not open file %s for reading", file);
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unsigned char * buf = malloc(MAX_FILE_SIZE + 1);
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int rv = fread(buf, 1, MAX_FILE_SIZE + 1, fp);
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if (file) fclose(fp);
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if (rv < 0) error_exit(1, "could not read from file %s", file);
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if (rv > MAX_FILE_SIZE) error_exit(1, "file %s is too big", file ? file : "<standard input>");
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*size = rv;
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return buf;
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}
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struct command pick_best_command (unsigned count, struct command command, ...) {
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struct command result = command;
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va_list ap;
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va_start(ap, command);
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while (-- count) {
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command = va_arg(ap, struct command);
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if (is_better(command, result)) result = command;
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}
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va_end(ap);
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return result;
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}
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int is_better (struct command new, struct command old) {
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if (new.command == 7) return 0;
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if (old.command == 7) return 1;
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short new_savings = new.count - command_size(new), old_savings = old.count - command_size(old);
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return new_savings > old_savings;
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}
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short command_size (struct command command) {
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short header_size = 1 + (command.count > SHORT_COMMAND_COUNT);
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if (command.command & 4) return header_size + 1 + (command.value >= 0);
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return header_size + command.command[(short []) {command.count, 1, 2, 0}];
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}
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unsigned short compressed_length (const struct command * commands, unsigned short count) {
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unsigned short current, total = 0;
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for (current = 0; current < count; current ++) if (commands[current].command != 7) total += command_size(commands[current]);
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return total;
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}
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