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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 (32 * 1024)
struct brotli_stream_state {
bool decompress;
union {
BrotliEncoderState *enc;
BrotliDecoderState *dec;
} u;
};
static int brotli_emit_chunk(
brotli_stream_chunk_cb cb, void *ctx,
const uint8_t *data, size_t len
) {
if (!cb || len == 0) return 0;
return cb(ctx, data, len);
}
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 int brotli_encoder_step(
brotli_stream_state_t *st,
const uint8_t *input,
size_t input_len,
BrotliEncoderOperation op,
brotli_stream_chunk_cb cb,
void *ctx
) {
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 -1;
}
size_t have = sizeof(out_buf) - avail_out;
if (brotli_emit_chunk(cb, ctx, out_buf, have) != 0) return -1;
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 0;
}
static int brotli_decoder_step(
brotli_stream_state_t *st,
const uint8_t *input,
size_t input_len,
brotli_stream_chunk_cb cb,
void *ctx
) {
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 (brotli_emit_chunk(cb, ctx, out_buf, have) != 0) return -1;
if (ret == BROTLI_DECODER_RESULT_ERROR) return -1;
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 0;
}
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);
}
int brotli_stream_process(
brotli_stream_state_t *st,
const uint8_t *input,
size_t input_len,
brotli_stream_chunk_cb cb,
void *ctx
) {
if (!st) return -1;
if (st->decompress) return brotli_decoder_step(st, input, input_len, cb, ctx);
return brotli_encoder_step(st, input, input_len, BROTLI_OPERATION_PROCESS, cb, ctx);
}
int brotli_stream_finish(
brotli_stream_state_t *st,
brotli_stream_chunk_cb cb,
void *ctx
) {
if (!st) return -1;
if (st->decompress) {
if (brotli_decoder_step(st, NULL, 0, cb, ctx) != 0) return -1;
return BrotliDecoderIsFinished(st->u.dec) ? 0 : -1;
}
return brotli_encoder_step(st, NULL, 0, BROTLI_OPERATION_FINISH, cb, ctx);
}
bool brotli_stream_is_finished(brotli_stream_state_t *st) {
if (!st) return false;
if (st->decompress) return BrotliDecoderIsFinished(st->u.dec);
return BrotliEncoderIsFinished(st->u.enc);
}
typedef struct {
ant_t *js;
ant_value_t ctrl_obj;
ant_value_t error;
} brotli_js_emit_ctx_t;
static int brotli_enqueue_chunk_cb(void *ctx, const uint8_t *chunk, size_t len) {
brotli_js_emit_ctx_t *emit = (brotli_js_emit_ctx_t *)ctx;
ant_value_t result = brotli_enqueue_buffer(emit->js, emit->ctrl_obj, chunk, len);
if (is_err(result)) {
emit->error = result;
return -1;
}
return 0;
}
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
) {
brotli_js_emit_ctx_t emit = { .js = js, .ctrl_obj = ctrl_obj, .error = js_mkundef() };
if (brotli_stream_process(st, input, input_len, brotli_enqueue_chunk_cb, &emit) != 0) {
if (is_err(emit.error)) return emit.error;
return js_mkerr_typed(js, JS_ERR_TYPE, st && st->decompress ? "Decompression failed" : "Compression failed");
}
return js_mkundef();
}
ant_value_t brotli_stream_flush(
ant_t *js, brotli_stream_state_t *st,
ant_value_t ctrl_obj
) {
brotli_js_emit_ctx_t emit = { .js = js, .ctrl_obj = ctrl_obj, .error = js_mkundef() };
if (brotli_stream_finish(st, brotli_enqueue_chunk_cb, &emit) != 0) {
if (is_err(emit.error)) return emit.error;
return js_mkerr_typed(js, JS_ERR_TYPE, st && st->decompress ? "Decompression failed" : "Compression failed");
}
return js_mkundef();
}

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