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/*
See license.txt in the root of this project.
*/
# include "luametatex.h"
/* # define BASEXX_PDF 1 */
# include <utiliof.h>
# include <utilbasexx.h>
# include <utillzw.h>
/*tex
First I had a mix of own code and LHF code (base64 and base85) but in the end I decided to reuse
some of pplibs code. Performance is ok, although we can speed up the base16 coders. When needed,
we can have a few more bur normally pure \LUA\ is quite ok for our purpose.
*/
# define encode_nl(L) \
(lua_type(L, 2) == LUA_TNUMBER) ? (lmt_tointeger(L, 2)) : ( (lua_isboolean(L, 2)) ? 80 : 0 )
# define lua_iof_push(L,out) \
lua_pushlstring(L,(const char *) out->buf, iof_size(out))
static int basexxlib_encode_16(lua_State *L)
{
size_t l;
const unsigned char *s = (const unsigned char*) luaL_checklstring(L, 1, &l);
size_t n = 2 * l;
size_t nl = encode_nl(L);
iof *inp = iof_filter_string_reader(s, l);
iof *out = iof_filter_buffer_writer(n);
if (nl) {
base16_encode_ln(inp, out, 0, nl);
} else {
base16_encode(inp, out);
}
lua_iof_push(L, out);
iof_close(out);
return 1;
}
static int basexxlib_decode_16(lua_State *L)
{
size_t l;
const unsigned char *s = (const unsigned char*) luaL_checklstring(L, 1, &l);
size_t n = l / 2;
iof *inp = iof_filter_string_reader(s, l);
iof *out = iof_filter_buffer_writer(n);
base16_decode(inp, out);
lua_iof_push(L, out);
iof_close(out);
return 1;
}
static int basexxlib_encode_64(lua_State *L)
{
size_t l;
const unsigned char *s = (const unsigned char*) luaL_checklstring(L,1,&l);
size_t n = 4 * l;
size_t nl = encode_nl(L);
iof *inp = iof_filter_string_reader(s,l);
iof *out = iof_filter_buffer_writer(n);
if (nl) {
base64_encode_ln(inp,out,0,nl);
} else {
base64_encode(inp,out);
}
lua_iof_push(L,out);
iof_close(out);
return 1;
}
static int basexxlib_decode_64(lua_State *L)
{
size_t l;
const unsigned char *s = (const unsigned char*) luaL_checklstring(L, 1, &l);
size_t n = l;
iof *inp = iof_filter_string_reader(s, l);
iof *out = iof_filter_buffer_writer(n);
base64_decode(inp, out);
lua_iof_push(L, out);
iof_close(out);
return 1;
}
static int basexxlib_encode_85(lua_State *L)
{
size_t l;
const unsigned char *s = (const unsigned char*) luaL_checklstring(L, 1, &l);
size_t n = 5 * l;
size_t nl = encode_nl(L);
iof *inp = iof_filter_string_reader(s, l);
iof *out = iof_filter_buffer_writer(n);
if (nl) {
base85_encode_ln(inp, out, 0, 80);
} else {
base85_encode(inp, out);
}
lua_iof_push(L,out);
iof_close(out);
return 1;
}
static int basexxlib_decode_85(lua_State *L)
{
size_t l;
const unsigned char *s = (const unsigned char*) luaL_checklstring(L, 1, &l);
size_t n = l;
iof *inp = iof_filter_string_reader(s, l);
iof *out = iof_filter_buffer_writer(n);
base85_decode(inp, out);
lua_iof_push(L, out);
iof_close(out);
return 1;
}
static int basexxlib_encode_RL(lua_State *L)
{
size_t l;
const unsigned char *s = (const unsigned char*) luaL_checklstring(L, 1, &l);
size_t n = 2 * l;
iof *inp = iof_filter_string_reader(s, l);
iof *out = iof_filter_buffer_writer(n);
runlength_encode(inp, out);
lua_iof_push(L, out);
iof_close(out);
return 1;
}
static int basexxlib_decode_RL(lua_State *L)
{
size_t l;
const unsigned char *s = (const unsigned char*) luaL_checklstring(L, 1, &l);
size_t n = 2 * l;
iof *inp = iof_filter_string_reader(s, l);
iof *out = iof_filter_buffer_writer(n);
runlength_decode(inp, out);
lua_iof_push(L, out);
iof_close(out);
return 1;
}
static int basexxlib_encode_LZW(lua_State *L)
{
size_t l;
const unsigned char *s = (const unsigned char*) luaL_checklstring(L, 1, &l);
size_t n = 2 * l;
char *t = lmt_memory_malloc(n);
int flags = lmt_optinteger(L, 2, LZW_ENCODER_DEFAULTS);
iof *inp = iof_filter_string_reader(s, l);
iof *out = iof_filter_string_writer(t, n);
lzw_encode(inp, out, flags);
lua_pushlstring(L, t, iof_size(out));
lmt_memory_free(t);
return 1;
}
static int basexxlib_decode_LZW(lua_State *L)
{
size_t l;
const unsigned char *s = (const unsigned char*) luaL_checklstring(L, 1, &l);
size_t n = 2 * l;
iof *inp = iof_filter_string_reader(s, l);
iof *out = iof_filter_buffer_writer(n);
int flags = lmt_optinteger(L, 2, LZW_DECODER_DEFAULTS);
lzw_decode(inp, out, flags);
lua_iof_push(L, out);
iof_close(out);
return 1;
}
static struct luaL_Reg basexxlib_function_list[] = {
{ "encode16", basexxlib_encode_16 },
{ "decode16", basexxlib_decode_16 },
{ "encode64", basexxlib_encode_64 },
{ "decode64", basexxlib_decode_64 },
{ "encode85", basexxlib_encode_85 },
{ "decode85", basexxlib_decode_85 },
{ "encodeRL", basexxlib_encode_RL },
{ "decodeRL", basexxlib_decode_RL },
{ "encodeLZW", basexxlib_encode_LZW },
{ "decodeLZW", basexxlib_decode_LZW },
{ NULL, NULL },
};
int luaopen_basexx(lua_State *L) {
lua_newtable(L);
luaL_setfuncs(L, basexxlib_function_list, 0);
return 1;
}
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