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brotli.c
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brotli.c
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#include <stdlib.h>
#include <string.h>
#include <brotli/encode.h>
#include <brotli/decode.h>
#include "ant.h"
#include "errors.h"
#include "internal.h"
#include "modules/buffer.h"
#include "streams/brotli.h"
#include "streams/transform.h"
#define BROTLI_CHUNK_SIZE 16384
struct brotli_stream_state {
bool decompress;
union {
BrotliEncoderState *enc;
BrotliDecoderState *dec;
} u;
};
static ant_value_t brotli_enqueue_buffer(
ant_t *js, ant_value_t ctrl_obj, const uint8_t *data, size_t len
) {
ArrayBufferData *ab = create_array_buffer_data(len);
if (!ab) return js_mkerr(js, "out of memory");
memcpy(ab->data, data, len);
ant_value_t arr = create_typed_array(js, TYPED_ARRAY_UINT8, ab, 0, len, "Uint8Array");
if (!ts_is_controller(ctrl_obj))
return js_mkerr_typed(js, JS_ERR_TYPE, "Invalid TransformStreamDefaultController");
return ts_ctrl_enqueue(js, ctrl_obj, arr);
}
static ant_value_t brotli_encoder_step(
ant_t *js, brotli_stream_state_t *st, ant_value_t ctrl_obj,
const uint8_t *input, size_t input_len, BrotliEncoderOperation op
) {
size_t avail_in = input_len;
const uint8_t *next_in = input;
for (;;) {
uint8_t out_buf[BROTLI_CHUNK_SIZE];
uint8_t *next_out = out_buf;
size_t avail_out = sizeof(out_buf);
if (!BrotliEncoderCompressStream(
st->u.enc, op, &avail_in, &next_in, &avail_out, &next_out, NULL)) {
return js_mkerr_typed(js, JS_ERR_TYPE, "Compression failed");
}
size_t have = sizeof(out_buf) - avail_out;
if (have > 0) {
ant_value_t r = brotli_enqueue_buffer(js, ctrl_obj, out_buf, have);
if (is_err(r)) return r;
}
if (op == BROTLI_OPERATION_FINISH) {
if (BrotliEncoderIsFinished(st->u.enc) &&
!BrotliEncoderHasMoreOutput(st->u.enc))
break;
} else if (avail_in == 0 && !BrotliEncoderHasMoreOutput(st->u.enc)) break;
}
return js_mkundef();
}
static ant_value_t brotli_decoder_step(
ant_t *js, brotli_stream_state_t *st, ant_value_t ctrl_obj,
const uint8_t *input, size_t input_len
) {
size_t avail_in = input_len;
const uint8_t *next_in = input;
for (;;) {
uint8_t out_buf[BROTLI_CHUNK_SIZE];
uint8_t *next_out = out_buf;
size_t avail_out = sizeof(out_buf);
BrotliDecoderResult ret = BrotliDecoderDecompressStream(
st->u.dec, &avail_in, &next_in, &avail_out, &next_out, NULL);
size_t have = sizeof(out_buf) - avail_out;
if (have > 0) {
ant_value_t r = brotli_enqueue_buffer(js, ctrl_obj, out_buf, have);
if (is_err(r)) return r;
}
if (ret == BROTLI_DECODER_RESULT_ERROR)
return js_mkerr_typed(js, JS_ERR_TYPE, "Decompression failed");
if (ret == BROTLI_DECODER_RESULT_SUCCESS) break;
if (ret == BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT ||
BrotliDecoderHasMoreOutput(st->u.dec)) continue;
if (ret == BROTLI_DECODER_RESULT_NEEDS_MORE_INPUT) break;
}
return js_mkundef();
}
brotli_stream_state_t *brotli_stream_state_new(bool decompress) {
brotli_stream_state_t *st = calloc(1, sizeof(*st));
if (!st) return NULL;
st->decompress = decompress;
if (decompress) {
st->u.dec = BrotliDecoderCreateInstance(NULL, NULL, NULL);
if (!st->u.dec) {
free(st);
return NULL;
}} else {
st->u.enc = BrotliEncoderCreateInstance(NULL, NULL, NULL);
if (!st->u.enc) {
free(st);
return NULL;
}}
return st;
}
void brotli_stream_state_destroy(brotli_stream_state_t *st) {
if (!st) return;
if (st->decompress) BrotliDecoderDestroyInstance(st->u.dec);
else BrotliEncoderDestroyInstance(st->u.enc);
free(st);
}
ant_value_t brotli_stream_transform(
ant_t *js, brotli_stream_state_t *st,
ant_value_t ctrl_obj, const uint8_t *input, size_t input_len
) {
if (st->decompress)
return brotli_decoder_step(js, st, ctrl_obj, input, input_len);
return brotli_encoder_step(js, st, ctrl_obj, input, input_len, BROTLI_OPERATION_PROCESS);
}
ant_value_t brotli_stream_flush(
ant_t *js, brotli_stream_state_t *st,
ant_value_t ctrl_obj
) {
if (st->decompress) {
ant_value_t result = brotli_decoder_step(js, st, ctrl_obj, NULL, 0);
if (is_err(result)) return result;
if (!BrotliDecoderIsFinished(st->u.dec))
return js_mkerr_typed(js, JS_ERR_TYPE, "Decompression failed");
return js_mkundef();
}
return brotli_encoder_step(js, st, ctrl_obj, NULL, 0, BROTLI_OPERATION_FINISH);
}

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