/
transcode.c
1554 lines (1367 loc) · 44.8 KB
/
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 "ruby/ruby.h"
#include "ruby/encoding.h"
#define PType (int)
#include "transcode_data.h"
#include <ctype.h>
VALUE rb_eConversionUndefined;
VALUE rb_eInvalidByteSequence;
VALUE rb_cEncodingConverter;
static VALUE sym_invalid, sym_undef, sym_ignore, sym_replace;
#define INVALID_IGNORE 0x1
#define INVALID_REPLACE 0x2
#define UNDEF_IGNORE 0x10
#define UNDEF_REPLACE 0x20
#define PARTIAL_INPUT 0x100
#define UNIVERSAL_NEWLINE 0x200
#define CRLF_NEWLINE 0x400
#define CR_NEWLINE 0x800
/*
* Dispatch data and logic
*/
typedef struct {
const char *from;
const char *to;
const char *lib; /* maybe null. it means that don't load the library. */
const rb_transcoder *transcoder;
} transcoder_entry_t;
static st_table *transcoder_table;
static transcoder_entry_t *
make_transcoder_entry(const char *from, const char *to)
{
st_data_t val;
st_table *table2;
if (!st_lookup(transcoder_table, (st_data_t)from, &val)) {
val = (st_data_t)st_init_strcasetable();
st_add_direct(transcoder_table, (st_data_t)from, val);
}
table2 = (st_table *)val;
if (!st_lookup(table2, (st_data_t)to, &val)) {
transcoder_entry_t *entry = ALLOC(transcoder_entry_t);
entry->from = from;
entry->to = to;
entry->lib = NULL;
entry->transcoder = NULL;
val = (st_data_t)entry;
st_add_direct(table2, (st_data_t)to, val);
}
return (transcoder_entry_t *)val;
}
static transcoder_entry_t *
get_transcoder_entry(const char *from, const char *to)
{
st_data_t val;
st_table *table2;
if (!st_lookup(transcoder_table, (st_data_t)from, &val)) {
return NULL;
}
table2 = (st_table *)val;
if (!st_lookup(table2, (st_data_t)to, &val)) {
return NULL;
}
return (transcoder_entry_t *)val;
}
void
rb_register_transcoder(const rb_transcoder *tr)
{
const char *const from_e = tr->from_encoding;
const char *const to_e = tr->to_encoding;
transcoder_entry_t *entry;
entry = make_transcoder_entry(from_e, to_e);
if (entry->transcoder) {
rb_raise(rb_eArgError, "transcoder from %s to %s has been already registered",
from_e, to_e);
}
entry->transcoder = tr;
}
static void
declare_transcoder(const char *to, const char *from, const char *lib)
{
transcoder_entry_t *entry;
entry = make_transcoder_entry(from, to);
entry->lib = lib;
}
#define MAX_TRANSCODER_LIBNAME_LEN 64
static const char transcoder_lib_prefix[] = "enc/trans/";
void
rb_declare_transcoder(const char *enc1, const char *enc2, const char *lib)
{
if (!lib || strlen(lib) > MAX_TRANSCODER_LIBNAME_LEN) {
rb_raise(rb_eArgError, "invalid library name - %s",
lib ? lib : "(null)");
}
declare_transcoder(enc1, enc2, lib);
declare_transcoder(enc2, enc1, 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 *to = (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)to, &val)) {
return ST_CONTINUE;
}
q = ALLOC(search_path_queue_t);
q->enc = to;
q->next = NULL;
*bfs->queue_last_ptr = q;
bfs->queue_last_ptr = &q->next;
st_add_direct(bfs->visited, (st_data_t)to, (st_data_t)bfs->base_enc);
return ST_CONTINUE;
}
static int
transcode_search_path(const char *from, const char *to,
void (*callback)(const char *from, const char *to, 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;
q = ALLOC(search_path_queue_t);
q->enc = from;
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)from, (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)to, &val)) {
st_add_direct(bfs.visited, (st_data_t)to, (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 = to;
pathlen = 0;
int depth;
while (1) {
st_lookup(bfs.visited, (st_data_t)enc, &val);
if (!val)
break;
pathlen++;
enc = (const char *)val;
}
depth = pathlen;
enc = to;
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);
if (found)
return pathlen;
else
return -1;
}
static const rb_transcoder *
load_transcoder_entry(transcoder_entry_t *entry)
{
if (entry->transcoder)
return entry->transcoder;
if (entry->lib) {
const char *lib = entry->lib;
int len = strlen(lib);
char path[sizeof(transcoder_lib_prefix) + MAX_TRANSCODER_LIBNAME_LEN];
entry->lib = NULL;
if (len > MAX_TRANSCODER_LIBNAME_LEN)
return NULL;
memcpy(path, transcoder_lib_prefix, sizeof(transcoder_lib_prefix) - 1);
memcpy(path + sizeof(transcoder_lib_prefix) - 1, lib, len + 1);
if (!rb_require(path))
return NULL;
}
if (entry->transcoder)
return entry->transcoder;
return NULL;
}
static const rb_transcoder *
load_transcoder(const char *from, const char *to)
{
transcoder_entry_t *entry;
const rb_transcoder *tr;
entry = get_transcoder_entry(from, to);
if (!entry)
return NULL;
tr = load_transcoder_entry(entry);
if (!tr)
return NULL;
return tr;
}
static const char*
get_replacement_character(rb_encoding *enc, int *len_ret)
{
static rb_encoding *utf16be_encoding, *utf16le_encoding;
static rb_encoding *utf32be_encoding, *utf32le_encoding;
if (!utf16be_encoding) {
utf16be_encoding = rb_enc_find("UTF-16BE");
utf16le_encoding = rb_enc_find("UTF-16LE");
utf32be_encoding = rb_enc_find("UTF-32BE");
utf32le_encoding = rb_enc_find("UTF-32LE");
}
if (rb_utf8_encoding() == enc) {
*len_ret = 3;
return "\xEF\xBF\xBD";
}
else if (utf16be_encoding == enc) {
*len_ret = 2;
return "\xFF\xFD";
}
else if (utf16le_encoding == enc) {
*len_ret = 2;
return "\xFD\xFF";
}
else if (utf32be_encoding == enc) {
*len_ret = 4;
return "\x00\x00\xFF\xFD";
}
else if (utf32le_encoding == enc) {
*len_ret = 4;
return "\xFD\xFF\x00\x00";
}
else {
*len_ret = 1;
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_trans_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;
int readagain_len = 0;
const unsigned char *inchar_start;
const unsigned char *in_p;
unsigned char *out_p;
const BYTE_LOOKUP *next_table;
VALUE next_info;
unsigned char next_byte;
unsigned char empty_buf;
unsigned char *empty_ptr = &empty_buf;
if (!in_pos) {
in_pos = (const unsigned char **)&empty_ptr;
in_stop = empty_ptr;
}
if (!out_pos) {
out_pos = &empty_ptr;
out_stop = empty_ptr;
}
in_p = inchar_start = *in_pos;
out_p = *out_pos;
next_table = tc->next_table;
next_info = tc->next_info;
next_byte = tc->next_byte;
#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; \
} \
tc->next_table = next_table; \
tc->next_info = next_info; \
tc->next_byte = next_byte; \
return ret; \
resume_label ## num:; \
} while (0)
#define SUSPEND_OBUF(num) \
do { \
while (out_stop - out_p < 1) { SUSPEND(transcode_obuf_full, num); } \
} while (0)
#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;
}
while (1) {
if (in_stop <= in_p) {
if (!(opt & PARTIAL_INPUT))
break;
SUSPEND(transcode_ibuf_empty, 7);
continue;
}
tc->recognized_len = 0;
inchar_start = in_p;
next_table = tr->conv_tree_start;
next_byte = (unsigned char)*in_p++;
follow_byte:
if (next_byte < next_table->base[0] || next_table->base[1] < next_byte)
next_info = INVALID;
else {
unsigned int next_offset = next_table->base[2+next_byte-next_table->base[0]];
next_info = (VALUE)next_table->info[next_offset];
}
follow_info:
switch (next_info & 0x1F) {
case NOMAP: /* xxx: copy last byte only? */
SUSPEND_OBUF(3); *out_p++ = next_byte;
continue;
case 0x00: case 0x04: case 0x08: case 0x0C:
case 0x10: case 0x14: case 0x18: case 0x1C:
while (in_p >= in_stop) {
if (!(opt & PARTIAL_INPUT))
goto invalid;
SUSPEND(transcode_ibuf_empty, 5);
}
next_byte = (unsigned char)*in_p++;
next_table = (const BYTE_LOOKUP *)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 FUNii:
next_info = (VALUE)(*tr->func_ii)(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)(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 += (VALUE)(*tr->func_io)(tc, next_info, out_p);
else {
writebuf_len = (VALUE)(*tr->func_io)(tc, next_info, TRANSCODING_WRITEBUF(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 += (VALUE)(*tr->func_so)(tc, char_start, (size_t)char_len, out_p);
}
else {
char_start = transcode_char_start(tc, *in_pos, inchar_start, in_p, &char_len);
writebuf_len = (VALUE)(*tr->func_so)(tc, char_start, (size_t)char_len, TRANSCODING_WRITEBUF(tc));
writebuf_off = 0;
while (writebuf_off < writebuf_len) {
SUSPEND_OBUF(22);
*out_p++ = TRANSCODING_WRITEBUF(tc)[writebuf_off++];
}
}
break;
}
case INVALID:
if (tc->recognized_len + (in_p - inchar_start) <= unitlen) {
while ((opt & PARTIAL_INPUT) && tc->recognized_len + (in_stop - inchar_start) < unitlen) {
in_p = in_stop;
SUSPEND(transcode_ibuf_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 {
int invalid_len; /* including the last byte which causes invalid */
int 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;
}
continue;
invalid:
SUSPEND(transcode_invalid_input, 1);
continue;
undef:
SUSPEND(transcode_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(tc, out_p);
}
else {
writebuf_len = tr->finish_func(tc, TRANSCODING_WRITEBUF(tc));
writebuf_off = 0;
while (writebuf_off < writebuf_len) {
SUSPEND_OBUF(23);
*out_p++ = TRANSCODING_WRITEBUF(tc)[writebuf_off++];
}
}
}
while (1)
SUSPEND(transcode_finished, 6);
#undef SUSPEND
#undef writebuf_len
#undef writebuf_off
}
static rb_trans_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_trans_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|PARTIAL_INPUT);
if (res != transcode_ibuf_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;
memset(tc->stateful, 0, sizeof(tc->stateful));
tc->resume_position = 0;
tc->recognized_len = 0;
tc->readagain_len = 0;
tc->writebuf_len = 0;
tc->writebuf_off = 0;
if (sizeof(tc->readbuf.ary) < tr->max_input) {
tc->readbuf.ptr = xmalloc(tr->max_input);
}
if (sizeof(tc->writebuf.ary) < tr->max_output) {
tc->writebuf.ptr = xmalloc(tr->max_output);
}
return tc;
}
static rb_transcoding *
rb_transcoding_open(const char *from, const char *to, int flags)
{
rb_transcoding *tc;
const rb_transcoder *tr;
tr = load_transcoder(from, to);
tc = rb_transcoding_open_by_transcoder(tr, flags);
return tc;
}
static rb_trans_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 (sizeof(tc->readbuf.ary) < tr->max_input)
xfree(tc->readbuf.ptr);
if (sizeof(tc->writebuf.ary) < tr->max_output)
xfree(tc->writebuf.ptr);
xfree(tc);
}
static rb_trans_t *
rb_trans_open_by_transcoder_entries(int n, transcoder_entry_t **entries)
{
rb_trans_t *ts;
int i;
for (i = 0; i < n; i++) {
const rb_transcoder *tr;
tr = load_transcoder_entry(entries[i]);
if (!tr)
return NULL;
}
ts = ALLOC(rb_trans_t);
ts->num_trans = n;
ts->elems = ALLOC_N(rb_trans_elem_t, ts->num_trans);
ts->num_finished = 0;
ts->last_tc = NULL;
for (i = 0; i < ts->num_trans; i++) {
const rb_transcoder *tr = load_transcoder_entry(entries[i]);
ts->elems[i].from = tr->from_encoding;
ts->elems[i].to = tr->to_encoding;
ts->elems[i].tc = rb_transcoding_open_by_transcoder(tr, 0);
ts->elems[i].out_buf_start = NULL;
ts->elems[i].out_data_start = NULL;
ts->elems[i].out_data_end = NULL;
ts->elems[i].out_buf_end = NULL;
ts->elems[i].last_result = transcode_ibuf_empty;
}
ts->last_tc = ts->elems[ts->num_trans-1].tc;
for (i = 0; i < ts->num_trans-1; i++) {
int bufsize = 4096;
unsigned char *p;
p = xmalloc(bufsize);
ts->elems[i].out_buf_start = p;
ts->elems[i].out_buf_end = p + bufsize;
ts->elems[i].out_data_start = p;
ts->elems[i].out_data_end = p;
}
return ts;
}
static void
trans_open_i(const char *from, const char *to, int depth, void *arg)
{
transcoder_entry_t ***entries_ptr = arg;
transcoder_entry_t **entries;
if (!*entries_ptr) {
entries = ALLOC_N(transcoder_entry_t *, depth+1+2);
*entries_ptr = entries;
}
else {
entries = *entries_ptr;
}
entries[depth] = get_transcoder_entry(from, to);
}
static rb_trans_t *
rb_trans_open(const char *from, const char *to, int flags)
{
transcoder_entry_t **entries = NULL;
int num_trans;
static rb_trans_t *ts;
num_trans = transcode_search_path(from, to, trans_open_i, (void *)&entries);
if (num_trans < 0 || !entries)
return NULL;
if (flags & (CRLF_NEWLINE|CR_NEWLINE)) {
char *name = (flags & CRLF_NEWLINE) ? "crlf_newline" : "cr_newline";
transcoder_entry_t *e = get_transcoder_entry("", name);
if (!e)
return NULL;
MEMMOVE(entries+1, entries, transcoder_entry_t *, num_trans);
entries[0] = e;
num_trans++;
}
if (flags & UNIVERSAL_NEWLINE) {
transcoder_entry_t *e = get_transcoder_entry("universal_newline", "");
if (!e)
return NULL;
entries[num_trans++] = e;
}
ts = rb_trans_open_by_transcoder_entries(num_trans, entries);
if (flags & UNIVERSAL_NEWLINE) {
ts->last_tc = ts->elems[ts->num_trans-2].tc;
}
return ts;
}
static int
trans_sweep(rb_trans_t *ts,
const unsigned char **input_ptr, const unsigned char *input_stop,
unsigned char **output_ptr, unsigned char *output_stop,
int flags,
int start)
{
int try;
int i, f;
const unsigned char **ipp, *is, *iold;
unsigned char **opp, *os, *oold;
rb_trans_result_t res;
try = 1;
while (try) {
try = 0;
for (i = start; i < ts->num_trans; i++) {
rb_trans_elem_t *te = &ts->elems[i];
if (i == 0) {
ipp = input_ptr;
is = input_stop;
}
else {
rb_trans_elem_t *prev_te = &ts->elems[i-1];
ipp = (const unsigned char **)&prev_te->out_data_start;
is = prev_te->out_data_end;
}
if (!te->out_buf_start) {
opp = output_ptr;
os = output_stop;
}
else {
if (te->out_buf_start != te->out_data_start) {
int len = te->out_data_end - te->out_data_start;
int off = te->out_data_start - te->out_buf_start;
MEMMOVE(te->out_buf_start, te->out_data_start, unsigned char, len);
te->out_data_start = te->out_buf_start;
te->out_data_end -= off;
}
opp = &te->out_data_end;
os = te->out_buf_end;
}
f = flags;
if (ts->num_finished != i)
f |= PARTIAL_INPUT;
iold = *ipp;
oold = *opp;
te->last_result = res = rb_transcoding_convert(te->tc, ipp, is, opp, os, f);
if (iold != *ipp || oold != *opp)
try = 1;
switch (res) {
case transcode_invalid_input:
case transcode_undefined_conversion:
return i;
case transcode_obuf_full:
case transcode_ibuf_empty:
break;
case transcode_finished:
ts->num_finished = i+1;
break;
}
}
}
return -1;
}
static rb_trans_result_t
rb_trans_conv(rb_trans_t *ts,
const unsigned char **input_ptr, const unsigned char *input_stop,
unsigned char **output_ptr, unsigned char *output_stop,
int flags)
{
int i;
int start, err_index;
unsigned char empty_buf;
unsigned char *empty_ptr = &empty_buf;
if (!input_ptr) {
input_ptr = (const unsigned char **)&empty_ptr;
input_stop = empty_ptr;
}
if (!output_ptr) {
output_ptr = &empty_ptr;
output_stop = empty_ptr;
}
err_index = -1;
for (i = ts->num_trans-1; 0 <= i; i--) {
if (ts->elems[i].last_result != transcode_ibuf_empty) {
err_index = i;
break;
}
}
do {
start = err_index + 1;
err_index = trans_sweep(ts, input_ptr, input_stop, output_ptr, output_stop, flags, start);
} while (err_index != -1 && err_index != ts->num_trans-1);
for (i = ts->num_trans-1; 0 <= i; i--) {
if (ts->elems[i].last_result != transcode_ibuf_empty) {
rb_trans_result_t res = ts->elems[i].last_result;
ts->elems[i].last_result = transcode_ibuf_empty;
return res;
}
}
return transcode_ibuf_empty;
}
static void
rb_trans_close(rb_trans_t *ts)
{
int i;
for (i = 0; i < ts->num_trans; i++) {
rb_transcoding_close(ts->elems[i].tc);
if (ts->elems[i].out_buf_start)
xfree(ts->elems[i].out_buf_start);
}
xfree(ts->elems);
xfree(ts);
}
static void
more_output_buffer(
VALUE destination,
unsigned char *(*resize_destination)(VALUE, int, int),
int max_output,
unsigned char **out_start_ptr,
unsigned char **out_pos,
unsigned char **out_stop_ptr)
{
size_t len = (*out_pos - *out_start_ptr);
size_t new_len = (len + max_output) * 2;
*out_start_ptr = resize_destination(destination, len, new_len);
*out_pos = *out_start_ptr + len;
*out_stop_ptr = *out_start_ptr + new_len;
}
static void
output_replacement_character(
VALUE destination,
unsigned char *(*resize_destination)(VALUE, int, int),
rb_transcoding *tc,
unsigned char **out_start_ptr,
unsigned char **out_pos,
unsigned char **out_stop_ptr)
{
const rb_transcoder *tr;
int max_output;
rb_encoding *enc;
const char *replacement;
int len;
tr = tc->transcoder;
max_output = tr->max_output;
enc = rb_enc_find(tr->to_encoding);
/*
* Assumption for stateful encoding:
*
* - The replacement character can be output on resetted state and doesn't
* change the state.
* - it is acceptable that extra state changing sequence if the replacement
* character contains a state changing sequence.
*
* Currently the replacement character for stateful encoding such as
* ISO-2022-JP is "?" and it has no state changing sequence.
* So the extra state changing sequence don't occur.
*
* Thease assumption may be removed in future.
* It needs to scan the replacement character to check
* state changing sequences in the replacement character.
*/
if (tr->resetstate_func) {
if (*out_stop_ptr - *out_pos < max_output)
more_output_buffer(destination, resize_destination, max_output, out_start_ptr, out_pos, out_stop_ptr);
*out_pos += tr->resetstate_func(tc, *out_pos);
}
if (*out_stop_ptr - *out_pos < max_output)
more_output_buffer(destination, resize_destination, max_output, out_start_ptr, out_pos, out_stop_ptr);
replacement = get_replacement_character(enc, &len);
memcpy(*out_pos, replacement, len);
*out_pos += len;
return;
}
#if 1
static void
transcode_loop(const unsigned char **in_pos, unsigned char **out_pos,
const unsigned char *in_stop, unsigned char *out_stop,
VALUE destination,
unsigned char *(*resize_destination)(VALUE, int, int),
const char *from_encoding,
const char *to_encoding,
const int opt)
{
rb_trans_t *ts;
rb_transcoding *last_tc;
rb_trans_result_t ret;
unsigned char *out_start = *out_pos;
int max_output;
ts = rb_trans_open(from_encoding, to_encoding, 0);