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filter.c
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filter.c
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/* Copyright 2009-2024
* Kaz Kylheku <[email protected]>
* Vancouver, Canada
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <string.h>
#include <wctype.h>
#include <wchar.h>
#include <stdarg.h>
#include <stdio.h>
#include <signal.h>
#include "config.h"
#include "lib.h"
#include "hash.h"
#include "signal.h"
#include "unwind.h"
#include "match.h"
#include "filter.h"
#include "eval.h"
#include "stream.h"
#include "buf.h"
val filters_s;
val filter_k, lfilt_k, rfilt_k, tohtml_k, fromhtml_k;
val tohtml_star_k;
val upcase_k, downcase_k;
val topercent_k, frompercent_k, tourl_k, fromurl_k, tobase64_k, frombase64_k;
val tobase64url_k, frombase64url_k;
val tonumber_k, toint_k, tofloat_k, hextoint_k;
static val make_trie(void)
{
return make_hash(hash_weak_none, nil);
}
static val trie_add(val trie, val key, val value)
{
val node, i, len = length_str(key);
for (node = trie, i = zero; lt(i, len); i = plus(i, one)) {
val ch = chr_str(key, i);
val newnode_p;
loc place = gethash_l(lit("trie-add"), node, ch, mkcloc(newnode_p));
if (newnode_p)
set(place, make_hash(hash_weak_none, nil));
node = deref(place);
}
set_hash_userdata(node, value);
return node;
}
/*
* Reduce the storage requirement for a the trie, by applying
* these rules:
*
* 1. All leaf-level nodes (i.e. empty hash tables) are replaced by
* just the node value (hash user data).
* 2. All hash tables with a single transition (i.e. hash tables
* containing one element) and which have no node value
* are replaced by a cons cell, whose CAR is the transition
* character, and whose CDR is the transition.
*/
static void trie_compress(loc ptrie)
{
val trie = deref(ptrie);
if (hashp(trie)) {
val count = hash_count(trie);
val value = get_hash_userdata(trie);
if (zerop(count)) {
set(ptrie, value);
} else if (count == one && nilp(value)) {
struct hash_iter hi;
val cell = (us_hash_iter_init(&hi, trie), hash_iter_next(&hi));
set(ptrie, cons(us_car(cell), us_cdr(cell)));
trie_compress(cdr_l(deref(ptrie)));
} else {
val cell;
struct hash_iter hi;
us_hash_iter_init(&hi, trie);
for (cell = hash_iter_next(&hi); cell; cell = hash_iter_next(&hi))
trie_compress(mkloc(*us_cdr_p(cell), cell));
}
} else if (consp(trie)) {
trie_compress(cdr_l(trie));
}
}
static val trie_compress_intrinsic(val ptrie)
{
trie_compress(mkcloc(ptrie));
return ptrie;
}
static val regex_from_trie(val trie)
{
switch (type(trie)) {
case NIL:
return t;
case CONS:
{
val a = car(trie);
val d = cdr(trie);
switch (type(d)) {
case CONS:
{
val rx = regex_from_trie(d);
if (consp(rx) && car(rx) == compound_s)
return cons(compound_s, cons(a, cdr(rx)));
return list(compound_s, a, rx, nao);
}
case COBJ:
if (d->co.cls == hash_cls)
return list(compound_s, a, regex_from_trie(d), nao);
/* fallthrough */
default:
return a;
}
}
case COBJ:
if (trie->co.cls == hash_cls) {
if (zerop(hash_count(trie))) {
return tnil(!get_hash_userdata(trie));
} else {
val out = nil;
val cell;
struct hash_iter hi;
us_hash_iter_init(&hi, trie);
while ((cell = hash_iter_next(&hi)) != nil) {
val a = us_car(cell);
val d = us_cdr(cell);
val rx = if2(consp(d) || hashp(d), regex_from_trie(d));
val ry = if3(consp(rx) && car(rx) == compound_s,
cons(compound_s, cons(a, cdr(rx))),
if3(rx, list(compound_s, a, rx, nao), a));
if (out)
out = list(or_s, ry, out, nao);
else
out = ry;
}
if (get_hash_userdata(trie))
out = list(or_s, nil, out, nao);
return out;
}
}
/* fallthrough */
default:
uw_throwf(error_s, lit("regex-from-trie: bad trie element ~s"), trie, nao);
}
}
val trie_lookup_begin(val trie)
{
return trie;
}
val trie_value_at(val node)
{
if (hashp(node))
return get_hash_userdata(node);
if (consp(node))
return nil;
if (functionp(node))
return nil;
return node;
}
val trie_lookup_feed_char(val node, val ch)
{
if (hashp(node))
return gethash(node, ch);
if (functionp(node))
return funcall1(node, ch);
if (consp(node) && ch == car(node))
return cdr(node);
return nil;
}
static val string_tree_filter(val tree, val filter)
{
return filter_string_tree(filter, tree);
}
static val compound_filter(val filter_list, val string)
{
return reduce_left(func_n2(string_tree_filter), filter_list, string, nil);
}
val get_filter(val spec)
{
if (consp(spec)) {
if (car(spec) == fun_k) {
return pa_123_2(func_n3(match_filter), second(spec), rest(rest(spec)));
} else {
val filter_list = mapcar(func_n1(get_filter), spec);
if (memqual(nil, filter_list))
return nil;
return pa_12_2(func_n2(compound_filter), filter_list);
}
}
return gethash(filters, spec);
}
struct filter_pair {
const wchli_t *key, *value;
};
static val build_filter(struct filter_pair *pair, val compress_p)
{
int i;
val trie = make_trie();
for (i = 0; pair[i].key; i++)
trie_add(trie, static_str(pair[i].key), static_str(pair[i].value));
if (compress_p)
trie_compress(mkcloc(trie));
return trie;
}
static val build_filter_from_list(val list)
{
val trie = make_trie();
val iter;
for (iter = list; iter; iter = cdr(iter)) {
val tuple = reverse(car(iter));
mapcar(pa_123_2(func_n3(trie_add), trie, first(tuple)), rest(tuple));
}
trie_compress(mkcloc(trie));
return trie;
}
static val trie_filter_string(val filter, val str)
{
val len = length_str(str);
val i;
val out = string(L"");
for (i = zero; lt(i, len); ) {
val node = trie_lookup_begin(filter);
val match = nil;
val subst = nil;
val j;
for (j = i; lt(j, len); j = plus(j, one)) {
val ch = chr_str(str, j);
val nnode = trie_lookup_feed_char(node, ch);
val nsubst;
if (!nnode)
break;
if ((nsubst = trie_value_at(nnode))) {
match = j;
subst = nsubst;
}
node = nnode;
}
if (match) {
string_extend(out, subst, nil);
i = plus(match, one);
} else {
string_extend(out, chr_str(str, i), nil);
i = plus(i, one);
}
}
return out;
}
val filter_string_tree(val filter, val obj)
{
val self = lit("filter-string-tree");
switch (type(obj)) {
case NIL:
return nil;
case CONS:
return mapcar(pa_12_2(func_n2(filter_string_tree), filter), obj);
default:
{
val type = typeof(filter);
if (type == null_s)
return obj;
if (type == hash_s || type == cons_s)
return trie_filter_string(filter, obj);
else if (type == fun_s)
return funcall1(filter, obj);
uw_throwf(type_error_s, lit("~a: ~s isn't a filter"),
self, filter, nao);
}
}
}
val filter_equal(val lfilt, val rfilt, val left, val right)
{
return equal(filter_string_tree(lfilt, left),
filter_string_tree(rfilt, right));
}
val register_filter(val sym, val table)
{
return sethash(filters, sym, build_filter_from_list(table));
}
static struct filter_pair tohtml_table[] = {
{ wli("<"), wli("<") },
{ wli(">"), wli(">") },
{ wli("&"), wli("&") },
{ wli("\""), wli(""") },
{ wli("'"), wli("'") },
{ 0, 0 }
};
static struct filter_pair tohtml_star_table[] = {
{ wli("<"), wli("<") },
{ wli(">"), wli(">") },
{ wli("&"), wli("&") },
{ 0, 0 }
};
static struct filter_pair fromhtml_table[] = {
{ wli("""), wli("\"") },
{ wli("&"), wli("&") },
{ wli("'"), wli("'") },
{ wli("<"), wli("<") },
{ wli(">"), wli(">") },
{ wli(" "), wli("\x00A0") },
{ wli("¡"), wli("\x00A1") },
{ wli("¢"), wli("\x00A2") },
{ wli("£"), wli("\x00A3") },
{ wli("¤"), wli("\x00A4") },
{ wli("¥"), wli("\x00A5") },
{ wli("¦"), wli("\x00A6") },
{ wli("§"), wli("\x00A7") },
{ wli("¨"), wli("\x00A8") },
{ wli("©"), wli("\x00A9") },
{ wli("ª"), wli("\x00AA") },
{ wli("«"), wli("\x00AB") },
{ wli("¬"), wli("\x00AC") },
{ wli("­"), wli("\x00AD") },
{ wli("®"), wli("\x00AE") },
{ wli("¯"), wli("\x00AF") },
{ wli("°"), wli("\x00B0") },
{ wli("±"), wli("\x00B1") },
{ wli("²"), wli("\x00B2") },
{ wli("³"), wli("\x00B3") },
{ wli("´"), wli("\x00B4") },
{ wli("µ"), wli("\x00B5") },
{ wli("¶"), wli("\x00B6") },
{ wli("·"), wli("\x00B7") },
{ wli("¸"), wli("\x00B8") },
{ wli("¹"), wli("\x00B9") },
{ wli("º"), wli("\x00BA") },
{ wli("»"), wli("\x00BB") },
{ wli("¼"), wli("\x00BC") },
{ wli("½"), wli("\x00BD") },
{ wli("¾"), wli("\x00BE") },
{ wli("¿"), wli("\x00BF") },
{ wli("À"), wli("\x00C0") },
{ wli("Á"), wli("\x00C1") },
{ wli("Â"), wli("\x00C2") },
{ wli("Ã"), wli("\x00C3") },
{ wli("Ä"), wli("\x00C4") },
{ wli("Å"), wli("\x00C5") },
{ wli("Æ"), wli("\x00C6") },
{ wli("Ç"), wli("\x00C7") },
{ wli("È"), wli("\x00C8") },
{ wli("É"), wli("\x00C9") },
{ wli("Ê"), wli("\x00CA") },
{ wli("Ë"), wli("\x00CB") },
{ wli("Ì"), wli("\x00CC") },
{ wli("Í"), wli("\x00CD") },
{ wli("Î"), wli("\x00CE") },
{ wli("Ï"), wli("\x00CF") },
{ wli("Ð"), wli("\x00D0") },
{ wli("Ñ"), wli("\x00D1") },
{ wli("Ò"), wli("\x00D2") },
{ wli("Ó"), wli("\x00D3") },
{ wli("Ô"), wli("\x00D4") },
{ wli("Õ"), wli("\x00D5") },
{ wli("Ö"), wli("\x00D6") },
{ wli("×"), wli("\x00D7") },
{ wli("Ø"), wli("\x00D8") },
{ wli("Ù"), wli("\x00D9") },
{ wli("Ú"), wli("\x00DA") },
{ wli("Û"), wli("\x00DB") },
{ wli("Ü"), wli("\x00DC") },
{ wli("Ý"), wli("\x00DD") },
{ wli("Þ"), wli("\x00DE") },
{ wli("ß"), wli("\x00DF") },
{ wli("à"), wli("\x00E0") },
{ wli("á"), wli("\x00E1") },
{ wli("â"), wli("\x00E2") },
{ wli("ã"), wli("\x00E3") },
{ wli("ä"), wli("\x00E4") },
{ wli("å"), wli("\x00E5") },
{ wli("æ"), wli("\x00E6") },
{ wli("ç"), wli("\x00E7") },
{ wli("è"), wli("\x00E8") },
{ wli("é"), wli("\x00E9") },
{ wli("ê"), wli("\x00EA") },
{ wli("ë"), wli("\x00EB") },
{ wli("ì"), wli("\x00EC") },
{ wli("í"), wli("\x00ED") },
{ wli("î"), wli("\x00EE") },
{ wli("ï"), wli("\x00EF") },
{ wli("ð"), wli("\x00F0") },
{ wli("ñ"), wli("\x00F1") },
{ wli("ò"), wli("\x00F2") },
{ wli("ó"), wli("\x00F3") },
{ wli("ô"), wli("\x00F4") },
{ wli("õ"), wli("\x00F5") },
{ wli("ö"), wli("\x00F6") },
{ wli("÷"), wli("\x00F7") },
{ wli("ø"), wli("\x00F8") },
{ wli("ù"), wli("\x00F9") },
{ wli("ú"), wli("\x00FA") },
{ wli("û"), wli("\x00FB") },
{ wli("ü"), wli("\x00FC") },
{ wli("ý"), wli("\x00FD") },
{ wli("þ"), wli("\x00FE") },
{ wli("ÿ"), wli("\x00FF") },
{ wli("Œ"), wli("\x0152") },
{ wli("œ"), wli("\x0153") },
{ wli("Š"), wli("\x0160") },
{ wli("š"), wli("\x0161") },
{ wli("Ÿ"), wli("\x0178") },
{ wli("ƒ"), wli("\x0192") },
{ wli("ˆ"), wli("\x02C6") },
{ wli("˜"), wli("\x02DC") },
{ wli("Α"), wli("\x0391") },
{ wli("Β"), wli("\x0392") },
{ wli("Γ"), wli("\x0393") },
{ wli("Δ"), wli("\x0394") },
{ wli("Ε"), wli("\x0395") },
{ wli("Ζ"), wli("\x0396") },
{ wli("Η"), wli("\x0397") },
{ wli("Θ"), wli("\x0398") },
{ wli("Ι"), wli("\x0399") },
{ wli("Κ"), wli("\x039A") },
{ wli("Λ"), wli("\x039B") },
{ wli("Μ"), wli("\x039C") },
{ wli("Ν"), wli("\x039D") },
{ wli("Ξ"), wli("\x039E") },
{ wli("Ο"), wli("\x039F") },
{ wli("Π"), wli("\x03A0") },
{ wli("Ρ"), wli("\x03A1") },
{ wli("Σ"), wli("\x03A3") },
{ wli("Τ"), wli("\x03A4") },
{ wli("Υ"), wli("\x03A5") },
{ wli("Φ"), wli("\x03A6") },
{ wli("Χ"), wli("\x03A7") },
{ wli("Ψ"), wli("\x03A8") },
{ wli("Ω"), wli("\x03A9") },
{ wli("α"), wli("\x03B1") },
{ wli("β"), wli("\x03B2") },
{ wli("γ"), wli("\x03B3") },
{ wli("δ"), wli("\x03B4") },
{ wli("ε"), wli("\x03B5") },
{ wli("ζ"), wli("\x03B6") },
{ wli("η"), wli("\x03B7") },
{ wli("θ"), wli("\x03B8") },
{ wli("ι"), wli("\x03B9") },
{ wli("κ"), wli("\x03BA") },
{ wli("λ"), wli("\x03BB") },
{ wli("μ"), wli("\x03BC") },
{ wli("ν"), wli("\x03BD") },
{ wli("ξ"), wli("\x03BE") },
{ wli("ο"), wli("\x03BF") },
{ wli("π"), wli("\x03C0") },
{ wli("ρ"), wli("\x03C1") },
{ wli("ς"), wli("\x03C2") },
{ wli("σ"), wli("\x03C3") },
{ wli("τ"), wli("\x03C4") },
{ wli("υ"), wli("\x03C5") },
{ wli("φ"), wli("\x03C6") },
{ wli("χ"), wli("\x03C7") },
{ wli("ψ"), wli("\x03C8") },
{ wli("ω"), wli("\x03C9") },
{ wli("ϑ"), wli("\x03D1") },
{ wli("ϒ"), wli("\x03D2") },
{ wli("ϖ"), wli("\x03D6") },
{ wli(" "), wli("\x2002") },
{ wli(" "), wli("\x2003") },
{ wli(" "), wli("\x2009") },
{ wli("‌"), wli("\x200C") },
{ wli("‍"), wli("\x200D") },
{ wli("‎"), wli("\x200E") },
{ wli("‏"), wli("\x200F") },
{ wli("–"), wli("\x2013") },
{ wli("—"), wli("\x2014") },
{ wli("‘"), wli("\x2018") },
{ wli("’"), wli("\x2019") },
{ wli("‚"), wli("\x201A") },
{ wli("“"), wli("\x201C") },
{ wli("”"), wli("\x201D") },
{ wli("„"), wli("\x201E") },
{ wli("†"), wli("\x2020") },
{ wli("‡"), wli("\x2021") },
{ wli("•"), wli("\x2022") },
{ wli("…"), wli("\x2026") },
{ wli("‰"), wli("\x2030") },
{ wli("′"), wli("\x2032") },
{ wli("″"), wli("\x2033") },
{ wli("‹"), wli("\x2039") },
{ wli("›"), wli("\x203A") },
{ wli("‾"), wli("\x203E") },
{ wli("⁄"), wli("\x2044") },
{ wli("€"), wli("\x20AC") },
{ wli("ℑ"), wli("\x2111") },
{ wli("℘"), wli("\x2118") },
{ wli("ℜ"), wli("\x211C") },
{ wli("™"), wli("\x2122") },
{ wli("ℵ"), wli("\x2135") },
{ wli("←"), wli("\x2190") },
{ wli("↑"), wli("\x2191") },
{ wli("→"), wli("\x2192") },
{ wli("↓"), wli("\x2193") },
{ wli("↔"), wli("\x2194") },
{ wli("↵"), wli("\x21B5") },
{ wli("⇐"), wli("\x21D0") },
{ wli("⇑"), wli("\x21D1") },
{ wli("⇒"), wli("\x21D2") },
{ wli("⇓"), wli("\x21D3") },
{ wli("⇔"), wli("\x21D4") },
{ wli("∀"), wli("\x2200") },
{ wli("∂"), wli("\x2202") },
{ wli("∃"), wli("\x2203") },
{ wli("∅"), wli("\x2205") },
{ wli("∇"), wli("\x2207") },
{ wli("∈"), wli("\x2208") },
{ wli("∉"), wli("\x2209") },
{ wli("∋"), wli("\x220B") },
{ wli("∏"), wli("\x220F") },
{ wli("∑"), wli("\x2211") },
{ wli("−"), wli("\x2212") },
{ wli("∗"), wli("\x2217") },
{ wli("√"), wli("\x221A") },
{ wli("∝"), wli("\x221D") },
{ wli("∞"), wli("\x221E") },
{ wli("∠"), wli("\x2220") },
{ wli("∧"), wli("\x2227") },
{ wli("∨"), wli("\x2228") },
{ wli("∩"), wli("\x2229") },
{ wli("∪"), wli("\x222A") },
{ wli("∫"), wli("\x222B") },
{ wli("∴"), wli("\x2234") },
{ wli("∼"), wli("\x223C") },
{ wli("≅"), wli("\x2245") },
{ wli("≈"), wli("\x2248") },
{ wli("≠"), wli("\x2260") },
{ wli("≡"), wli("\x2261") },
{ wli("≤"), wli("\x2264") },
{ wli("≥"), wli("\x2265") },
{ wli("⊂"), wli("\x2282") },
{ wli("⊃"), wli("\x2283") },
{ wli("⊄"), wli("\x2284") },
{ wli("⊆"), wli("\x2286") },
{ wli("⊇"), wli("\x2287") },
{ wli("⊕"), wli("\x2295") },
{ wli("⊗"), wli("\x2297") },
{ wli("⊥"), wli("\x22A5") },
{ wli("⋅"), wli("\x22C5") },
{ wli("⌈"), wli("\x2308") },
{ wli("⌉"), wli("\x2309") },
{ wli("⌊"), wli("\x230A") },
{ wli("⌋"), wli("\x230B") },
{ wli("⟨"), wli("\x2329") },
{ wli("⟩"), wli("\x232A") },
{ wli("◊"), wli("\x25CA") },
{ wli("♠"), wli("\x2660") },
{ wli("♣"), wli("\x2663") },
{ wli("♥"), wli("\x2665") },
{ wli("♦"), wli("\x2666") },
{ 0, 0 }
};
static int digit_value(int digit)
{
if (digit >= '0' && digit <= '9')
return digit - '0';
if (digit >= 'A' && digit <= 'F')
return digit - 'A' + 10;
if (digit >= 'a' && digit <= 'f')
return digit - 'a' + 10;
internal_error("bad digit");
}
static val html_hex_continue(val hexlist, val ch)
{
if (iswxdigit(c_chr(ch))) {
return func_f1(cons(ch, hexlist), html_hex_continue);
} if (ch == chr(';')) {
wchar_t out[2] = { 0 };
val iter;
if (nilp(hexlist))
return nil;
for (iter = nreverse(hexlist); iter; iter = cdr(iter)) {
val hexch = car(iter);
int val = digit_value(c_chr(hexch));
out[0] <<= 4;
out[0] |= val;
}
return string(out);
} else {
return nil;
}
}
static val html_dec_continue(val declist, val ch)
{
if (iswdigit(c_chr(ch))) {
return func_f1(cons(ch, declist), html_dec_continue);
} if (ch == chr(';')) {
wchar_t out[2] = { 0 };
val iter;
for (iter = nreverse(declist); iter; iter = cdr(iter)) {
val decch = car(iter);
int val = c_chr(decch) - '0';
out[0] *= 10;
out[0] += val;
}
return string(out);
} else {
return nil;
}
}
static val html_numeric_handler(val ch)
{
if (ch == chr('x'))
return func_f1(nil, html_hex_continue);
if (!iswdigit(c_chr(ch)))
return nil;
return func_f1(cons(ch, nil), html_dec_continue);
}
static int is_url_reserved(int ch)
{
return (ch <= 0x20 || ch >= 0x7F || strchr(":/?#[]@!$&'()*+,;=%", ch) != 0);
}
val url_encode(val str, val space_plus)
{
val self = lit("url-encode");
val in_byte = make_string_byte_input_stream(str);
val out = make_string_output_stream();
val ch;
while ((ch = get_byte(in_byte)) != nil) {
int c = c_num(ch, self);
if (space_plus && c == ' ')
put_char(chr('+'), out);
else if (is_url_reserved(c))
format(out, lit("%~1X~1X"), num_fast(c >> 4), num_fast(c & 0xf), nao);
else
put_char(chr_int(ch), out);
}
return get_string_from_stream(out);
}
val url_decode(val str, val space_plus)
{
val self = lit("url-encode");
val in = make_string_input_stream(str);
val out = make_string_output_stream();
for (;;) {
val ch = get_char(in);
if (ch == chr('%')) {
val ch2 = get_char(in);
val ch3 = get_char(in);
if (ch2 && ch3 && chr_isxdigit(ch2) && chr_isxdigit(ch3)) {
int byte = digit_value(c_num(ch2, self)) << 4 | digit_value(c_num(ch3, self));
put_byte(num_fast(byte), out);
} else {
put_char(ch, out);
if (!ch2)
break;
put_char(ch2, out);
if (!ch3)
break;
put_char(ch3, out);
}
continue;
}
if (space_plus && ch == chr('+')) {
put_char(chr(' '), out);
continue;
}
if (!ch)
break;
put_char(ch, out);
}
return get_string_from_stream(out);
}
INLINE void col_check(cnum *pcol, cnum wcol, val out)
{
if (wcol && ++(*pcol) >= wcol) {
*pcol = 0;
put_char(chr('\n'), out);
}
}
static val base64_stream_enc_impl(val out, val in, val nbytes, val wrap_cols,
const char *b64)
{
val self = lit("base64-stream-enc");
int ulim = nilp(default_null_arg(nbytes));
cnum col = 0;
cnum nb = if3(ulim, 0, c_num(nbytes, self));
cnum count = 0;
val ret = zero;
cnum wcol = c_num(default_arg(wrap_cols, zero), self);
for (; ulim || nb > 0; ulim ? --nb : 0) {
val bv0 = get_byte(in);
val bv1 = if2(bv0 && (ulim || --nb > 0), get_byte(in));
val bv2 = if2(bv1 && (ulim || --nb > 0), get_byte(in));
if (bv2) {
cnum b0 = c_num(bv0, self);
cnum b1 = c_num(bv1, self);
cnum b2 = c_num(bv2, self);
cnum word = (b0 << 16) | (b1 << 8) | b2;
put_char(chr(b64[(word >> 18) ]), out); col_check(&col, wcol, out);
put_char(chr(b64[(word >> 12) & 0x3F]), out); col_check(&col, wcol, out);
put_char(chr(b64[(word >> 6) & 0x3F]), out); col_check(&col, wcol, out);
put_char(chr(b64[(word ) & 0x3F]), out); col_check(&col, wcol, out);
count += 3;
} else if (bv1) {
cnum b0 = c_num(bv0, self);
cnum b1 = c_num(bv1, self);
cnum word = (b0 << 16) | (b1 << 8);
put_char(chr(b64[(word >> 18) ]), out); col_check(&col, wcol, out);
put_char(chr(b64[(word >> 12) & 0x3F]), out); col_check(&col, wcol, out);
put_char(chr(b64[(word >> 6) & 0x3F]), out); col_check(&col, wcol, out);
put_char(chr('='), out); col_check(&col, wcol, out);
count += 2;
break;
} else if (bv0) {
cnum b0 = c_num(bv0, self);
cnum word = (b0 << 16);
put_char(chr(b64[(word >> 18) ]), out); col_check(&col, wcol, out);
put_char(chr(b64[(word >> 12) & 0x3F]), out); col_check(&col, wcol, out);
put_char(chr('='), out); col_check(&col, wcol, out);
put_char(chr('='), out); col_check(&col, wcol, out);
count++;
break;
} else {
break;
}
if (count > NUM_MAX / 2) {
ret = plus(ret, num_fast(count));
count = 0;
}
}
if (wcol && col > 0)
put_char(chr('\n'), out);
return plus(ret, num_fast(count));
}
val base64_stream_enc(val out, val in, val nbytes, val wrap_cols)
{
static const char *b64 = {
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
};
return base64_stream_enc_impl(out, in, nbytes, wrap_cols, b64);
}
val base64_encode(val str, val wrap_cols)
{
val in = make_byte_input_stream(str);
val out = make_string_output_stream();
(void) base64_stream_enc(out, in, nil, wrap_cols);
return get_string_from_stream(out);
}
val base64url_stream_enc(val out, val in, val nbytes, val wrap_cols)
{
static const char *b64 = {
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"
};
return base64_stream_enc_impl(out, in, nbytes, wrap_cols, b64);
}
val base64url_encode(val str, val wrap_cols)
{
val in = make_byte_input_stream(str);
val out = make_string_output_stream();
(void) base64url_stream_enc(out, in, nil, wrap_cols);
return get_string_from_stream(out);
}
INLINE cnum get_base64_char(val in)
{
for (;;) {
val ch = get_char(in);
if (!ch)
return 0;
if (chr_isalnum(ch) || ch == chr('+') || ch == chr('/'))
return c_chr(ch);
if (!chr_isspace(ch) && ch != chr('=')) {
unget_char(ch, in);
return 0;
}
}
}
INLINE int b64_code(cnum c)
{
if ('A' <= c && c <= 'Z')
return c - 'A';
if ('a' <= c && c <= 'z')
return c - 'a' + 26;
if ('0' <= c && c <= '9')
return c - '0' + 26 + 26;
switch (c) {
case '+':
return 62;
case '/':
return 63;
default:
return 0;
}
}
static val base64_stream_dec_impl(val out, val in,
cnum (*get_char)(val),
int (*get_code)(cnum))
{
val ret = zero;
cnum count = 0;
for (;;) {
cnum c0 = get_char(in);
cnum c1 = c0 ? get_char(in) : 0;
cnum c2 = c1 ? get_char(in) : 0;
cnum c3 = c2 ? get_char(in) : 0;
if (c3) {
long f0 = get_code(c0);
long f1 = get_code(c1);
long f2 = get_code(c2);
long f3 = get_code(c3);
long word = (f0 << 18) | (f1 << 12) | (f2 << 6) | f3;
put_byte(num_fast((word >> 16) ), out);
put_byte(num_fast((word >> 8) & 0xff), out);
put_byte(num_fast( word & 0xff), out);
count += 3;
} else if (c2) {
long f0 = get_code(c0);
long f1 = get_code(c1);
long f2 = get_code(c2);
long word = (f0 << 18) | (f1 << 12) | (f2 << 6);
put_byte(num_fast((word >> 16) ), out);
put_byte(num_fast((word >> 8) & 0xff), out);
count += 2;
break;
} else if (c0 || c1) {
long f0 = get_code(c0);
long f1 = get_code(c1);
long word = (f0 << 18) | (f1 << 12);
put_byte(num_fast((word >> 16) ), out);
count += 1;
break;
} else {
break;
}
if (count > NUM_MAX / 2) {
ret = plus(ret, num_fast(count));
count = 0;
}
}
return plus(ret, num_fast(count));
}
val base64_stream_dec(val out, val in)
{
return base64_stream_dec_impl(out, in, get_base64_char, b64_code);
}
val base64_decode(val str)
{
val in = make_string_input_stream(str);
val out = make_string_output_stream();
(void) base64_stream_dec(out, in);
return get_string_from_stream(out);
}
val base64_decode_buf(val str)
{
val in = make_string_input_stream(str);
val out = make_buf_stream(nil);
(void) base64_stream_dec(out, in);
return get_buf_from_stream(out);
}
INLINE cnum get_base64url_char(val in)
{
for (;;) {
val ch = get_char(in);
if (!ch)
return 0;
if (chr_isalnum(ch) || ch == chr('-') || ch == chr('_'))
return c_chr(ch);
if (!chr_isspace(ch) && ch != chr('=')) {
unget_char(ch, in);
return 0;
}
}
}
INLINE int b64url_code(cnum c)
{
if ('A' <= c && c <= 'Z')
return c - 'A';
if ('a' <= c && c <= 'z')
return c - 'a' + 26;
if ('0' <= c && c <= '9')
return c - '0' + 26 + 26;
switch (c) {
case '-':
return 62;
case '_':
return 63;
default:
return 0;
}
}
val base64url_stream_dec(val out, val in)
{
return base64_stream_dec_impl(out, in, get_base64url_char, b64url_code);
}