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transcode.c
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/**********************************************************************
transcode.c -
$Author$
created at: Tue Oct 30 16:10:22 JST 2007
Copyright (C) 2007 Martin Duerst
**********************************************************************/
#include "internal.h"
#include "transcode_data.h"
#include <ctype.h>
#define ENABLE_ECONV_NEWLINE_OPTION 1
/* VALUE rb_cEncoding = rb_define_class("Encoding", rb_cObject); */
VALUE rb_eUndefinedConversionError;
VALUE rb_eInvalidByteSequenceError;
VALUE rb_eConverterNotFoundError;
VALUE rb_cEncodingConverter;
static VALUE sym_invalid, sym_undef, sym_replace, sym_fallback, sym_aref;
static VALUE sym_xml, sym_text, sym_attr;
static VALUE sym_universal_newline;
static VALUE sym_crlf_newline;
static VALUE sym_cr_newline;
#ifdef ENABLE_ECONV_NEWLINE_OPTION
static VALUE sym_newline, sym_universal, sym_crlf, sym_cr, sym_lf;
#endif
static VALUE sym_partial_input;
static VALUE sym_invalid_byte_sequence;
static VALUE sym_undefined_conversion;
static VALUE sym_destination_buffer_full;
static VALUE sym_source_buffer_empty;
static VALUE sym_finished;
static VALUE sym_after_output;
static VALUE sym_incomplete_input;
static unsigned char *
allocate_converted_string(const char *sname, const char *dname,
const unsigned char *str, size_t len,
unsigned char *caller_dst_buf, size_t caller_dst_bufsize,
size_t *dst_len_ptr);
/* dynamic structure, one per conversion (similar to iconv_t) */
/* may carry conversion state (e.g. for iso-2022-jp) */
typedef struct rb_transcoding {
const rb_transcoder *transcoder;
int flags;
int resume_position;
unsigned int next_table;
VALUE next_info;
unsigned char next_byte;
unsigned int output_index;
ssize_t recognized_len; /* already interpreted */
ssize_t readagain_len; /* not yet interpreted */
union {
unsigned char ary[8]; /* max_input <= sizeof(ary) */
unsigned char *ptr; /* length: max_input */
} readbuf; /* recognized_len + readagain_len used */
ssize_t writebuf_off;
ssize_t writebuf_len;
union {
unsigned char ary[8]; /* max_output <= sizeof(ary) */
unsigned char *ptr; /* length: max_output */
} writebuf;
union rb_transcoding_state_t { /* opaque data for stateful encoding */
void *ptr;
char ary[sizeof(double) > sizeof(void*) ? sizeof(double) : sizeof(void*)];
double dummy_for_alignment;
} state;
} rb_transcoding;
#define TRANSCODING_READBUF(tc) \
((tc)->transcoder->max_input <= (int)sizeof((tc)->readbuf.ary) ? \
(tc)->readbuf.ary : \
(tc)->readbuf.ptr)
#define TRANSCODING_WRITEBUF(tc) \
((tc)->transcoder->max_output <= (int)sizeof((tc)->writebuf.ary) ? \
(tc)->writebuf.ary : \
(tc)->writebuf.ptr)
#define TRANSCODING_WRITEBUF_SIZE(tc) \
((tc)->transcoder->max_output <= (int)sizeof((tc)->writebuf.ary) ? \
sizeof((tc)->writebuf.ary) : \
(size_t)(tc)->transcoder->max_output)
#define TRANSCODING_STATE_EMBED_MAX ((int)sizeof(union rb_transcoding_state_t))
#define TRANSCODING_STATE(tc) \
((tc)->transcoder->state_size <= (int)sizeof((tc)->state) ? \
(tc)->state.ary : \
(tc)->state.ptr)
typedef struct {
struct rb_transcoding *tc;
unsigned char *out_buf_start;
unsigned char *out_data_start;
unsigned char *out_data_end;
unsigned char *out_buf_end;
rb_econv_result_t last_result;
} rb_econv_elem_t;
struct rb_econv_t {
int flags;
int started; /* bool */
const char *source_encoding_name;
const char *destination_encoding_name;
const unsigned char *replacement_str;
size_t replacement_len;
const char *replacement_enc;
unsigned char *in_buf_start;
unsigned char *in_data_start;
unsigned char *in_data_end;
unsigned char *in_buf_end;
rb_econv_elem_t *elems;
int replacement_allocated; /* bool */
int num_allocated;
int num_trans;
int num_finished;
struct rb_transcoding *last_tc;
/* last error */
struct {
rb_econv_result_t result;
struct rb_transcoding *error_tc;
const char *source_encoding;
const char *destination_encoding;
const unsigned char *error_bytes_start;
size_t error_bytes_len;
size_t readagain_len;
} last_error;
/* The following fields are only for Encoding::Converter.
* rb_econv_open set them NULL. */
rb_encoding *source_encoding;
rb_encoding *destination_encoding;
};
/*
* Dispatch data and logic
*/
#define DECORATOR_P(sname, dname) (*(sname) == '\0')
typedef struct {
const char *sname;
const char *dname;
const char *lib; /* null means means no need to load a library */
const rb_transcoder *transcoder;
} transcoder_entry_t;
static st_table *transcoder_table;
static transcoder_entry_t *
make_transcoder_entry(const char *sname, const char *dname)
{
st_data_t val;
st_table *table2;
if (!st_lookup(transcoder_table, (st_data_t)sname, &val)) {
val = (st_data_t)st_init_strcasetable();
st_add_direct(transcoder_table, (st_data_t)sname, val);
}
table2 = (st_table *)val;
if (!st_lookup(table2, (st_data_t)dname, &val)) {
transcoder_entry_t *entry = ALLOC(transcoder_entry_t);
entry->sname = sname;
entry->dname = dname;
entry->lib = NULL;
entry->transcoder = NULL;
val = (st_data_t)entry;
st_add_direct(table2, (st_data_t)dname, val);
}
return (transcoder_entry_t *)val;
}
static transcoder_entry_t *
get_transcoder_entry(const char *sname, const char *dname)
{
st_data_t val;
st_table *table2;
if (!st_lookup(transcoder_table, (st_data_t)sname, &val)) {
return NULL;
}
table2 = (st_table *)val;
if (!st_lookup(table2, (st_data_t)dname, &val)) {
return NULL;
}
return (transcoder_entry_t *)val;
}
void
rb_register_transcoder(const rb_transcoder *tr)
{
const char *const sname = tr->src_encoding;
const char *const dname = tr->dst_encoding;
transcoder_entry_t *entry;
entry = make_transcoder_entry(sname, dname);
if (entry->transcoder) {
rb_raise(rb_eArgError, "transcoder from %s to %s has been already registered",
sname, dname);
}
entry->transcoder = tr;
}
static void
declare_transcoder(const char *sname, const char *dname, const char *lib)
{
transcoder_entry_t *entry;
entry = make_transcoder_entry(sname, dname);
entry->lib = lib;
}
static const char transcoder_lib_prefix[] = "enc/trans/";
void
rb_declare_transcoder(const char *enc1, const char *enc2, const char *lib)
{
if (!lib) {
rb_raise(rb_eArgError, "invalid library name - (null)");
}
declare_transcoder(enc1, enc2, lib);
}
#define encoding_equal(enc1, enc2) (STRCASECMP((enc1), (enc2)) == 0)
typedef struct search_path_queue_tag {
struct search_path_queue_tag *next;
const char *enc;
} search_path_queue_t;
typedef struct {
st_table *visited;
search_path_queue_t *queue;
search_path_queue_t **queue_last_ptr;
const char *base_enc;
} search_path_bfs_t;
static int
transcode_search_path_i(st_data_t key, st_data_t val, st_data_t arg)
{
const char *dname = (const char *)key;
search_path_bfs_t *bfs = (search_path_bfs_t *)arg;
search_path_queue_t *q;
if (st_lookup(bfs->visited, (st_data_t)dname, &val)) {
return ST_CONTINUE;
}
q = ALLOC(search_path_queue_t);
q->enc = dname;
q->next = NULL;
*bfs->queue_last_ptr = q;
bfs->queue_last_ptr = &q->next;
st_add_direct(bfs->visited, (st_data_t)dname, (st_data_t)bfs->base_enc);
return ST_CONTINUE;
}
static int
transcode_search_path(const char *sname, const char *dname,
void (*callback)(const char *sname, const char *dname, int depth, void *arg),
void *arg)
{
search_path_bfs_t bfs;
search_path_queue_t *q;
st_data_t val;
st_table *table2;
int found;
int pathlen = -1;
if (encoding_equal(sname, dname))
return -1;
q = ALLOC(search_path_queue_t);
q->enc = sname;
q->next = NULL;
bfs.queue_last_ptr = &q->next;
bfs.queue = q;
bfs.visited = st_init_strcasetable();
st_add_direct(bfs.visited, (st_data_t)sname, (st_data_t)NULL);
while (bfs.queue) {
q = bfs.queue;
bfs.queue = q->next;
if (!bfs.queue)
bfs.queue_last_ptr = &bfs.queue;
if (!st_lookup(transcoder_table, (st_data_t)q->enc, &val)) {
xfree(q);
continue;
}
table2 = (st_table *)val;
if (st_lookup(table2, (st_data_t)dname, &val)) {
st_add_direct(bfs.visited, (st_data_t)dname, (st_data_t)q->enc);
xfree(q);
found = 1;
goto cleanup;
}
bfs.base_enc = q->enc;
st_foreach(table2, transcode_search_path_i, (st_data_t)&bfs);
bfs.base_enc = NULL;
xfree(q);
}
found = 0;
cleanup:
while (bfs.queue) {
q = bfs.queue;
bfs.queue = q->next;
xfree(q);
}
if (found) {
const char *enc = dname;
int depth;
pathlen = 0;
while (1) {
st_lookup(bfs.visited, (st_data_t)enc, &val);
if (!val)
break;
pathlen++;
enc = (const char *)val;
}
depth = pathlen;
enc = dname;
while (1) {
st_lookup(bfs.visited, (st_data_t)enc, &val);
if (!val)
break;
callback((const char *)val, enc, --depth, arg);
enc = (const char *)val;
}
}
st_free_table(bfs.visited);
return pathlen; /* is -1 if not found */
}
static const rb_transcoder *
load_transcoder_entry(transcoder_entry_t *entry)
{
if (entry->transcoder)
return entry->transcoder;
if (entry->lib) {
const char *const lib = entry->lib;
const size_t len = strlen(lib);
const size_t total_len = sizeof(transcoder_lib_prefix) - 1 + len;
const VALUE fn = rb_str_new(0, total_len);
char *const path = RSTRING_PTR(fn);
const int safe = rb_safe_level();
memcpy(path, transcoder_lib_prefix, sizeof(transcoder_lib_prefix) - 1);
memcpy(path + sizeof(transcoder_lib_prefix) - 1, lib, len);
rb_str_set_len(fn, total_len);
FL_UNSET(fn, FL_TAINT);
OBJ_FREEZE(fn);
rb_require_safe(fn, safe > 3 ? 3 : safe);
}
if (entry->transcoder)
return entry->transcoder;
return NULL;
}
static const char*
get_replacement_character(const char *encname, size_t *len_ret, const char **repl_encname_ptr)
{
if (encoding_equal(encname, "UTF-8")) {
*len_ret = 3;
*repl_encname_ptr = "UTF-8";
return "\xEF\xBF\xBD";
}
else {
*len_ret = 1;
*repl_encname_ptr = "US-ASCII";
return "?";
}
}
/*
* Transcoding engine logic
*/
static const unsigned char *
transcode_char_start(rb_transcoding *tc,
const unsigned char *in_start,
const unsigned char *inchar_start,
const unsigned char *in_p,
size_t *char_len_ptr)
{
const unsigned char *ptr;
if (inchar_start - in_start < tc->recognized_len) {
MEMCPY(TRANSCODING_READBUF(tc) + tc->recognized_len,
inchar_start, unsigned char, in_p - inchar_start);
ptr = TRANSCODING_READBUF(tc);
}
else {
ptr = inchar_start - tc->recognized_len;
}
*char_len_ptr = tc->recognized_len + (in_p - inchar_start);
return ptr;
}
static rb_econv_result_t
transcode_restartable0(const unsigned char **in_pos, unsigned char **out_pos,
const unsigned char *in_stop, unsigned char *out_stop,
rb_transcoding *tc,
const int opt)
{
const rb_transcoder *tr = tc->transcoder;
int unitlen = tr->input_unit_length;
ssize_t readagain_len = 0;
const unsigned char *inchar_start;
const unsigned char *in_p;
unsigned char *out_p;
in_p = inchar_start = *in_pos;
out_p = *out_pos;
#define SUSPEND(ret, num) \
do { \
tc->resume_position = (num); \
if (0 < in_p - inchar_start) \
MEMMOVE(TRANSCODING_READBUF(tc)+tc->recognized_len, \
inchar_start, unsigned char, in_p - inchar_start); \
*in_pos = in_p; \
*out_pos = out_p; \
tc->recognized_len += in_p - inchar_start; \
if (readagain_len) { \
tc->recognized_len -= readagain_len; \
tc->readagain_len = readagain_len; \
} \
return (ret); \
resume_label ## num:; \
} while (0)
#define SUSPEND_OBUF(num) \
do { \
while (out_stop - out_p < 1) { SUSPEND(econv_destination_buffer_full, num); } \
} while (0)
#define SUSPEND_AFTER_OUTPUT(num) \
if ((opt & ECONV_AFTER_OUTPUT) && *out_pos != out_p) { \
SUSPEND(econv_after_output, num); \
}
#define next_table (tc->next_table)
#define next_info (tc->next_info)
#define next_byte (tc->next_byte)
#define writebuf_len (tc->writebuf_len)
#define writebuf_off (tc->writebuf_off)
switch (tc->resume_position) {
case 0: break;
case 1: goto resume_label1;
case 2: goto resume_label2;
case 3: goto resume_label3;
case 4: goto resume_label4;
case 5: goto resume_label5;
case 6: goto resume_label6;
case 7: goto resume_label7;
case 8: goto resume_label8;
case 9: goto resume_label9;
case 10: goto resume_label10;
case 11: goto resume_label11;
case 12: goto resume_label12;
case 13: goto resume_label13;
case 14: goto resume_label14;
case 15: goto resume_label15;
case 16: goto resume_label16;
case 17: goto resume_label17;
case 18: goto resume_label18;
case 19: goto resume_label19;
case 20: goto resume_label20;
case 21: goto resume_label21;
case 22: goto resume_label22;
case 23: goto resume_label23;
case 24: goto resume_label24;
case 25: goto resume_label25;
case 26: goto resume_label26;
case 27: goto resume_label27;
case 28: goto resume_label28;
case 29: goto resume_label29;
case 30: goto resume_label30;
case 31: goto resume_label31;
case 32: goto resume_label32;
case 33: goto resume_label33;
case 34: goto resume_label34;
}
while (1) {
inchar_start = in_p;
tc->recognized_len = 0;
next_table = tr->conv_tree_start;
SUSPEND_AFTER_OUTPUT(24);
if (in_stop <= in_p) {
if (!(opt & ECONV_PARTIAL_INPUT))
break;
SUSPEND(econv_source_buffer_empty, 7);
continue;
}
#define BYTE_ADDR(index) (tr->byte_array + (index))
#define WORD_ADDR(index) (tr->word_array + INFO2WORDINDEX(index))
#define BL_BASE BYTE_ADDR(BYTE_LOOKUP_BASE(WORD_ADDR(next_table)))
#define BL_INFO WORD_ADDR(BYTE_LOOKUP_INFO(WORD_ADDR(next_table)))
#define BL_MIN_BYTE (BL_BASE[0])
#define BL_MAX_BYTE (BL_BASE[1])
#define BL_OFFSET(byte) (BL_BASE[2+(byte)-BL_MIN_BYTE])
#define BL_ACTION(byte) (BL_INFO[BL_OFFSET((byte))])
next_byte = (unsigned char)*in_p++;
follow_byte:
if (next_byte < BL_MIN_BYTE || BL_MAX_BYTE < next_byte)
next_info = INVALID;
else {
next_info = (VALUE)BL_ACTION(next_byte);
}
follow_info:
switch (next_info & 0x1F) {
case NOMAP:
{
const unsigned char *p = inchar_start;
writebuf_off = 0;
while (p < in_p) {
TRANSCODING_WRITEBUF(tc)[writebuf_off++] = (unsigned char)*p++;
}
writebuf_len = writebuf_off;
writebuf_off = 0;
while (writebuf_off < writebuf_len) {
SUSPEND_OBUF(3);
*out_p++ = TRANSCODING_WRITEBUF(tc)[writebuf_off++];
}
}
continue;
case 0x00: case 0x04: case 0x08: case 0x0C:
case 0x10: case 0x14: case 0x18: case 0x1C:
SUSPEND_AFTER_OUTPUT(25);
while (in_p >= in_stop) {
if (!(opt & ECONV_PARTIAL_INPUT))
goto incomplete;
SUSPEND(econv_source_buffer_empty, 5);
}
next_byte = (unsigned char)*in_p++;
next_table = (unsigned int)next_info;
goto follow_byte;
case ZERObt: /* drop input */
continue;
case ONEbt:
SUSPEND_OBUF(9); *out_p++ = getBT1(next_info);
continue;
case TWObt:
SUSPEND_OBUF(10); *out_p++ = getBT1(next_info);
SUSPEND_OBUF(21); *out_p++ = getBT2(next_info);
continue;
case THREEbt:
SUSPEND_OBUF(11); *out_p++ = getBT1(next_info);
SUSPEND_OBUF(15); *out_p++ = getBT2(next_info);
SUSPEND_OBUF(16); *out_p++ = getBT3(next_info);
continue;
case FOURbt:
SUSPEND_OBUF(12); *out_p++ = getBT0(next_info);
SUSPEND_OBUF(17); *out_p++ = getBT1(next_info);
SUSPEND_OBUF(18); *out_p++ = getBT2(next_info);
SUSPEND_OBUF(19); *out_p++ = getBT3(next_info);
continue;
case GB4bt:
SUSPEND_OBUF(29); *out_p++ = getGB4bt0(next_info);
SUSPEND_OBUF(30); *out_p++ = getGB4bt1(next_info);
SUSPEND_OBUF(31); *out_p++ = getGB4bt2(next_info);
SUSPEND_OBUF(32); *out_p++ = getGB4bt3(next_info);
continue;
case STR1:
tc->output_index = 0;
while (tc->output_index < STR1_LENGTH(BYTE_ADDR(STR1_BYTEINDEX(next_info)))) {
SUSPEND_OBUF(28); *out_p++ = BYTE_ADDR(STR1_BYTEINDEX(next_info))[1+tc->output_index];
tc->output_index++;
}
continue;
case FUNii:
next_info = (VALUE)(*tr->func_ii)(TRANSCODING_STATE(tc), next_info);
goto follow_info;
case FUNsi:
{
const unsigned char *char_start;
size_t char_len;
char_start = transcode_char_start(tc, *in_pos, inchar_start, in_p, &char_len);
next_info = (VALUE)(*tr->func_si)(TRANSCODING_STATE(tc), char_start, (size_t)char_len);
goto follow_info;
}
case FUNio:
SUSPEND_OBUF(13);
if (tr->max_output <= out_stop - out_p)
out_p += tr->func_io(TRANSCODING_STATE(tc),
next_info, out_p, out_stop - out_p);
else {
writebuf_len = tr->func_io(TRANSCODING_STATE(tc),
next_info,
TRANSCODING_WRITEBUF(tc), TRANSCODING_WRITEBUF_SIZE(tc));
writebuf_off = 0;
while (writebuf_off < writebuf_len) {
SUSPEND_OBUF(20);
*out_p++ = TRANSCODING_WRITEBUF(tc)[writebuf_off++];
}
}
break;
case FUNso:
{
const unsigned char *char_start;
size_t char_len;
SUSPEND_OBUF(14);
if (tr->max_output <= out_stop - out_p) {
char_start = transcode_char_start(tc, *in_pos, inchar_start, in_p, &char_len);
out_p += tr->func_so(TRANSCODING_STATE(tc),
char_start, (size_t)char_len,
out_p, out_stop - out_p);
}
else {
char_start = transcode_char_start(tc, *in_pos, inchar_start, in_p, &char_len);
writebuf_len = tr->func_so(TRANSCODING_STATE(tc),
char_start, (size_t)char_len,
TRANSCODING_WRITEBUF(tc), TRANSCODING_WRITEBUF_SIZE(tc));
writebuf_off = 0;
while (writebuf_off < writebuf_len) {
SUSPEND_OBUF(22);
*out_p++ = TRANSCODING_WRITEBUF(tc)[writebuf_off++];
}
}
break;
}
case FUNsio:
{
const unsigned char *char_start;
size_t char_len;
SUSPEND_OBUF(33);
if (tr->max_output <= out_stop - out_p) {
char_start = transcode_char_start(tc, *in_pos, inchar_start, in_p, &char_len);
out_p += tr->func_sio(TRANSCODING_STATE(tc),
char_start, (size_t)char_len, next_info,
out_p, out_stop - out_p);
}
else {
char_start = transcode_char_start(tc, *in_pos, inchar_start, in_p, &char_len);
writebuf_len = tr->func_sio(TRANSCODING_STATE(tc),
char_start, (size_t)char_len, next_info,
TRANSCODING_WRITEBUF(tc), TRANSCODING_WRITEBUF_SIZE(tc));
writebuf_off = 0;
while (writebuf_off < writebuf_len) {
SUSPEND_OBUF(34);
*out_p++ = TRANSCODING_WRITEBUF(tc)[writebuf_off++];
}
}
break;
}
case INVALID:
if (tc->recognized_len + (in_p - inchar_start) <= unitlen) {
if (tc->recognized_len + (in_p - inchar_start) < unitlen)
SUSPEND_AFTER_OUTPUT(26);
while ((opt & ECONV_PARTIAL_INPUT) && tc->recognized_len + (in_stop - inchar_start) < unitlen) {
in_p = in_stop;
SUSPEND(econv_source_buffer_empty, 8);
}
if (tc->recognized_len + (in_stop - inchar_start) <= unitlen) {
in_p = in_stop;
}
else {
in_p = inchar_start + (unitlen - tc->recognized_len);
}
}
else {
ssize_t invalid_len; /* including the last byte which causes invalid */
ssize_t discard_len;
invalid_len = tc->recognized_len + (in_p - inchar_start);
discard_len = ((invalid_len - 1) / unitlen) * unitlen;
readagain_len = invalid_len - discard_len;
}
goto invalid;
case UNDEF:
goto undef;
default:
rb_raise(rb_eRuntimeError, "unknown transcoding instruction");
}
continue;
invalid:
SUSPEND(econv_invalid_byte_sequence, 1);
continue;
incomplete:
SUSPEND(econv_incomplete_input, 27);
continue;
undef:
SUSPEND(econv_undefined_conversion, 2);
continue;
}
/* cleanup */
if (tr->finish_func) {
SUSPEND_OBUF(4);
if (tr->max_output <= out_stop - out_p) {
out_p += tr->finish_func(TRANSCODING_STATE(tc),
out_p, out_stop - out_p);
}
else {
writebuf_len = tr->finish_func(TRANSCODING_STATE(tc),
TRANSCODING_WRITEBUF(tc), TRANSCODING_WRITEBUF_SIZE(tc));
writebuf_off = 0;
while (writebuf_off < writebuf_len) {
SUSPEND_OBUF(23);
*out_p++ = TRANSCODING_WRITEBUF(tc)[writebuf_off++];
}
}
}
while (1)
SUSPEND(econv_finished, 6);
#undef SUSPEND
#undef next_table
#undef next_info
#undef next_byte
#undef writebuf_len
#undef writebuf_off
}
static rb_econv_result_t
transcode_restartable(const unsigned char **in_pos, unsigned char **out_pos,
const unsigned char *in_stop, unsigned char *out_stop,
rb_transcoding *tc,
const int opt)
{
if (tc->readagain_len) {
unsigned char *readagain_buf = ALLOCA_N(unsigned char, tc->readagain_len);
const unsigned char *readagain_pos = readagain_buf;
const unsigned char *readagain_stop = readagain_buf + tc->readagain_len;
rb_econv_result_t res;
MEMCPY(readagain_buf, TRANSCODING_READBUF(tc) + tc->recognized_len,
unsigned char, tc->readagain_len);
tc->readagain_len = 0;
res = transcode_restartable0(&readagain_pos, out_pos, readagain_stop, out_stop, tc, opt|ECONV_PARTIAL_INPUT);
if (res != econv_source_buffer_empty) {
MEMCPY(TRANSCODING_READBUF(tc) + tc->recognized_len + tc->readagain_len,
readagain_pos, unsigned char, readagain_stop - readagain_pos);
tc->readagain_len += readagain_stop - readagain_pos;
return res;
}
}
return transcode_restartable0(in_pos, out_pos, in_stop, out_stop, tc, opt);
}
static rb_transcoding *
rb_transcoding_open_by_transcoder(const rb_transcoder *tr, int flags)
{
rb_transcoding *tc;
tc = ALLOC(rb_transcoding);
tc->transcoder = tr;
tc->flags = flags;
if (TRANSCODING_STATE_EMBED_MAX < tr->state_size)
tc->state.ptr = xmalloc(tr->state_size);
if (tr->state_init_func) {
(tr->state_init_func)(TRANSCODING_STATE(tc)); /* xxx: check return value */
}
tc->resume_position = 0;
tc->recognized_len = 0;
tc->readagain_len = 0;
tc->writebuf_len = 0;
tc->writebuf_off = 0;
if ((int)sizeof(tc->readbuf.ary) < tr->max_input) {
tc->readbuf.ptr = xmalloc(tr->max_input);
}
if ((int)sizeof(tc->writebuf.ary) < tr->max_output) {
tc->writebuf.ptr = xmalloc(tr->max_output);
}
return tc;
}
static rb_econv_result_t
rb_transcoding_convert(rb_transcoding *tc,
const unsigned char **input_ptr, const unsigned char *input_stop,
unsigned char **output_ptr, unsigned char *output_stop,
int flags)
{
return transcode_restartable(
input_ptr, output_ptr,
input_stop, output_stop,
tc, flags);
}
static void
rb_transcoding_close(rb_transcoding *tc)
{
const rb_transcoder *tr = tc->transcoder;
if (tr->state_fini_func) {
(tr->state_fini_func)(TRANSCODING_STATE(tc)); /* check return value? */
}
if (TRANSCODING_STATE_EMBED_MAX < tr->state_size)
xfree(tc->state.ptr);
if ((int)sizeof(tc->readbuf.ary) < tr->max_input)
xfree(tc->readbuf.ptr);
if ((int)sizeof(tc->writebuf.ary) < tr->max_output)
xfree(tc->writebuf.ptr);
xfree(tc);
}
static size_t
rb_transcoding_memsize(rb_transcoding *tc)
{
size_t size = sizeof(rb_transcoding);
const rb_transcoder *tr = tc->transcoder;
if (TRANSCODING_STATE_EMBED_MAX < tr->state_size) {
size += tr->state_size;
}
if ((int)sizeof(tc->readbuf.ary) < tr->max_input) {
size += tr->max_input;
}
if ((int)sizeof(tc->writebuf.ary) < tr->max_output) {
size += tr->max_output;
}
return size;
}
static rb_econv_t *
rb_econv_alloc(int n_hint)
{
rb_econv_t *ec;
if (n_hint <= 0)
n_hint = 1;
ec = ALLOC(rb_econv_t);
ec->flags = 0;
ec->source_encoding_name = NULL;
ec->destination_encoding_name = NULL;
ec->started = 0;
ec->replacement_str = NULL;
ec->replacement_len = 0;
ec->replacement_enc = NULL;
ec->replacement_allocated = 0;
ec->in_buf_start = NULL;
ec->in_data_start = NULL;
ec->in_data_end = NULL;
ec->in_buf_end = NULL;
ec->num_allocated = n_hint;
ec->num_trans = 0;
ec->elems = ALLOC_N(rb_econv_elem_t, ec->num_allocated);
ec->num_finished = 0;
ec->last_tc = NULL;
ec->last_error.result = econv_source_buffer_empty;
ec->last_error.error_tc = NULL;
ec->last_error.source_encoding = NULL;
ec->last_error.destination_encoding = NULL;
ec->last_error.error_bytes_start = NULL;
ec->last_error.error_bytes_len = 0;
ec->last_error.readagain_len = 0;
ec->source_encoding = NULL;
ec->destination_encoding = NULL;
return ec;
}
static int
rb_econv_add_transcoder_at(rb_econv_t *ec, const rb_transcoder *tr, int i)
{
int n, j;
int bufsize = 4096;
unsigned char *p;
if (ec->num_trans == ec->num_allocated) {
n = ec->num_allocated * 2;
REALLOC_N(ec->elems, rb_econv_elem_t, n);
ec->num_allocated = n;
}
p = xmalloc(bufsize);
MEMMOVE(ec->elems+i+1, ec->elems+i, rb_econv_elem_t, ec->num_trans-i);
ec->elems[i].tc = rb_transcoding_open_by_transcoder(tr, 0);
ec->elems[i].out_buf_start = p;
ec->elems[i].out_buf_end = p + bufsize;
ec->elems[i].out_data_start = p;
ec->elems[i].out_data_end = p;
ec->elems[i].last_result = econv_source_buffer_empty;
ec->num_trans++;
if (!DECORATOR_P(tr->src_encoding, tr->dst_encoding))
for (j = ec->num_trans-1; i <= j; j--) {
rb_transcoding *tc = ec->elems[j].tc;
const rb_transcoder *tr2 = tc->transcoder;
if (!DECORATOR_P(tr2->src_encoding, tr2->dst_encoding)) {
ec->last_tc = tc;
break;
}
}
return 0;
}
static rb_econv_t *
rb_econv_open_by_transcoder_entries(int n, transcoder_entry_t **entries)
{
rb_econv_t *ec;
int i, ret;
for (i = 0; i < n; i++) {
const rb_transcoder *tr;
tr = load_transcoder_entry(entries[i]);
if (!tr)
return NULL;
}
ec = rb_econv_alloc(n);
for (i = 0; i < n; i++) {
const rb_transcoder *tr = load_transcoder_entry(entries[i]);
ret = rb_econv_add_transcoder_at(ec, tr, ec->num_trans);
if (ret == -1) {
rb_econv_close(ec);
return NULL;
}
}
return ec;
}
struct trans_open_t {
transcoder_entry_t **entries;
int num_additional;
};
static void
trans_open_i(const char *sname, const char *dname, int depth, void *arg)
{
struct trans_open_t *toarg = arg;
if (!toarg->entries) {
toarg->entries = ALLOC_N(transcoder_entry_t *, depth+1+toarg->num_additional);
}
toarg->entries[depth] = get_transcoder_entry(sname, dname);
}
static rb_econv_t *
rb_econv_open0(const char *sname, const char *dname, int ecflags)
{
transcoder_entry_t **entries = NULL;
int num_trans;
rb_econv_t *ec;
int sidx, didx;
if (*sname) {
sidx = rb_enc_find_index(sname);
if (0 <= sidx) {
rb_enc_from_index(sidx);
}
}
if (*dname) {
didx = rb_enc_find_index(dname);
if (0 <= didx) {
rb_enc_from_index(didx);
}
}
if (*sname == '\0' && *dname == '\0') {
num_trans = 0;
entries = NULL;
sname = dname = "";
}
else {
struct trans_open_t toarg;
toarg.entries = NULL;