42 #include "../my_config.h"
55 #define ESCAPE_FIXED_SEQUENCE_NORMAL 0xAD
56 #define ESCAPE_FIXED_SEQUENCE_SPARSE_FILE 0xAE
58 #define MAX_BUFFER_SIZE 102400
60 #if SSIZE_MAX < MAX_BUFFER_SIZE
61 #undef MAX_BUFFER_SIZE
62 #define MAX_BUFFER_SIZE SSIZE_MAX
72 class escape :
public generic_file
104 escape(generic_file *below,
105 const std::set<sequence_type> & x_unjumpable);
106 escape(
const escape & ref) :
generic_file(ref) { copy_from(ref); };
107 const escape & operator = (
const escape & ref);
112 void add_mark_at_current_position(sequence_type t);
120 bool skip_to_next_mark(sequence_type t,
bool jump);
121 bool next_to_read_is_mark(sequence_type t);
122 bool next_to_read_is_which_mark(sequence_type & t);
124 void add_unjumpable_mark(sequence_type t) {
if(
is_terminated())
throw SRC_BUG; unjumpable.insert(t); };
125 void remove_unjumpable_mark(sequence_type t);
126 bool is_unjumpable_mark(sequence_type t)
const {
return unjumpable.find(t) != unjumpable.end(); };
127 void clear_all_unjumpable_marks() { unjumpable.clear(); };
135 bool skippable(skippability direction,
const infinint & amount);
136 bool skip(
const infinint & pos);
138 bool skip_relative(S_I x);
139 infinint get_position()
const;
142 void inherited_read_ahead(
const infinint & amount);
143 U_I inherited_read(
char *a, U_I size);
144 void inherited_write(
const char *a, U_I size);
145 void inherited_sync_write() { flush_write(); };
146 void inherited_flush_read() { flush_write(); clean_read(); };
147 void inherited_terminate() { flush_or_clean(); };
149 void change_fixed_escape_sequence(
unsigned char value) { fixed_sequence[0] = value; };
150 bool has_escaped_data_since_last_skip()
const {
return escaped_data_count_since_last_skip > 0; };
157 static const U_I ESCAPE_SEQUENCE_LENGTH = 6;
158 static const U_I WRITE_BUFFER_SIZE = 2*ESCAPE_SEQUENCE_LENGTH;
159 static const U_I READ_BUFFER_SIZE = MAX_BUFFER_SIZE;
160 static const infinint READ_BUFFER_SIZE_INFININT;
169 static const unsigned char usual_fixed_sequence[ESCAPE_SEQUENCE_LENGTH];
174 U_I write_buffer_size;
175 char write_buffer[WRITE_BUFFER_SIZE];
177 U_I read_buffer_size;
180 U_I escape_seq_offset_in_buffer;
181 char read_buffer[READ_BUFFER_SIZE];
182 std::set<sequence_type> unjumpable;
183 unsigned char fixed_sequence[ESCAPE_SEQUENCE_LENGTH];
184 infinint escaped_data_count_since_last_skip;
185 infinint below_position;
189 void set_fixed_sequence_for(sequence_type t) { fixed_sequence[ESCAPE_SEQUENCE_LENGTH - 1] = type2char(t); };
190 void check_below()
const {
if(x_below ==
nullptr)
throw SRC_BUG; };
193 void flush_or_clean()
208 void copy_from(
const escape & ref);
209 bool mini_read_buffer();
214 static char type2char(sequence_type x);
215 static sequence_type char2type(
char x);
223 static U_I trouve_amorce(
const char *a, U_I size,
const unsigned char escape_sequence[ESCAPE_SEQUENCE_LENGTH]);
233 static U_I remove_data_marks_and_stop_at_first_real_mark(
char *a, U_I size, U_I & delta,
const unsigned char escape_sequence[ESCAPE_SEQUENCE_LENGTH]);
class generic_file is defined here as well as class fichierthe generic_file interface is widely used ...
bool is_terminated() const
generic_file(gf_mode m)
main constructor
gf_mode get_mode() const
retreive the openning mode for this object
libdar namespace encapsulate all libdar symbols