mirror of
https://github.com/rkd77/elinks.git
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213 lines
4.3 KiB
C
213 lines
4.3 KiB
C
/* Brotli encoding (ENCODING_BROTLI) backend */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#include <string.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <brotli/decode.h>
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#include <errno.h>
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#include "elinks.h"
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#include "encoding/brotli.h"
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#include "encoding/encoding.h"
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#include "util/math.h"
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#include "util/memory.h"
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#define ELINKS_BROTLI_BUFFER_LENGTH 4096
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struct br_enc_data {
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BrotliDecoderState *state;
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const uint8_t *next_in;
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uint8_t *next_out;
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size_t avail_in;
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size_t avail_out;
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size_t total_out;
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uint8_t *buffer;
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size_t sent_pos;
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/* The file descriptor from which we read. */
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int fdread;
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unsigned int decoded:1;
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unsigned int after_end:1;
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unsigned int last_read:1;
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unsigned char buf[ELINKS_BROTLI_BUFFER_LENGTH];
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};
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static int
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brotli_open(struct stream_encoded *stream, int fd)
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{
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struct br_enc_data *data = (struct br_enc_data *)mem_calloc(1, sizeof(*data));
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stream->data = NULL;
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if (!data) {
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return -1;
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}
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data->state = BrotliDecoderCreateInstance(NULL, NULL, NULL);
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if (!data->state) {
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mem_free(data);
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return -1;
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}
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data->fdread = fd;
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data->decoded = 0;
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data->after_end = 0;
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data->last_read = 0;
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stream->data = data;
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return 0;
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}
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static char *brotli_decode_buffer(struct stream_encoded *st, char *datac, int len, int *new_len);
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static int
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brotli_read(struct stream_encoded *stream, char *buf, int len)
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{
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struct br_enc_data *data = (struct br_enc_data *) stream->data;
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if (!data) return -1;
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assert(len > 0);
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if (!data->decoded) {
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size_t read_pos = 0;
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char *tmp_buf = (char *)mem_alloc(len);
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int new_len;
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if (!tmp_buf) {
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return 0;
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}
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do {
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int l = safe_read(data->fdread, tmp_buf + read_pos, len - read_pos);
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if (!l) break;
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if (l == -1 && errno == EAGAIN) {
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continue;
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}
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if (l == -1) {
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return -1;
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}
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read_pos += l;
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} while (1);
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if (brotli_decode_buffer(stream, tmp_buf, len, &new_len)) {
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data->decoded = 1;
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}
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mem_free(tmp_buf);
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}
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if (data->decoded) {
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int length = len < (data->total_out - data->sent_pos) ? len : (data->total_out - data->sent_pos);
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if (length <= 0) {
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mem_free_set(&data->buffer, NULL);
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} else {
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memcpy(buf, (void *)((char *)(data->buffer) + data->sent_pos), length);
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data->sent_pos += length;
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}
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return length;
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}
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return -1;
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}
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static char *
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brotli_decode_buffer(struct stream_encoded *st, char *datac, int len, int *new_len)
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{
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uint8_t *data = (uint8_t *)datac;
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struct br_enc_data *enc_data = (struct br_enc_data *)st->data;
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BrotliDecoderState *state = enc_data->state;
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int error;
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*new_len = 0; /* default, left there if an error occurs */
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if (!len) return NULL;
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enc_data->next_in = data;
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enc_data->avail_in = len;
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do {
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char *new_buffer;
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size_t size = enc_data->total_out + ELINKS_BROTLI_BUFFER_LENGTH;
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new_buffer = (char *)mem_realloc(enc_data->buffer, size);
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if (!new_buffer) {
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error = BROTLI_DECODER_RESULT_ERROR;
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break;
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}
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enc_data->buffer = (uint8_t *)new_buffer;
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enc_data->next_out = enc_data->buffer + enc_data->total_out;
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enc_data->avail_out = ELINKS_BROTLI_BUFFER_LENGTH;
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error = BrotliDecoderDecompressStream(state, &enc_data->avail_in, &enc_data->next_in,
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&enc_data->avail_out, &enc_data->next_out, &enc_data->total_out);
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if (error == BROTLI_DECODER_RESULT_SUCCESS) {
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*new_len = enc_data->total_out;
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enc_data->after_end = 1;
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return (char *)enc_data->buffer;
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}
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} while (error == BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT);
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if (error == BROTLI_DECODER_RESULT_ERROR) {
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mem_free_if(enc_data->buffer);
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enc_data->buffer = NULL;
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}
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return NULL;
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}
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static void
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brotli_close(struct stream_encoded *stream)
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{
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struct br_enc_data *data = (struct br_enc_data *) stream->data;
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if (data) {
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if (data->state) BrotliDecoderDestroyInstance(data->state);
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if (data->fdread != -1) {
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close(data->fdread);
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}
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mem_free(data);
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stream->data = 0;
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}
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}
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const char *
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get_brotli_version(void)
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{
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static char version[16];
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if (!version[0]) {
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int v = BrotliDecoderVersion();
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int major = v >> 24;
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int minor = (v >> 12) & 0xFFF;
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int patch = v & 0xFFF;
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snprintf(version, 15, "%d.%d.%d", major, minor, patch);
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}
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return version;
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}
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static const char *const brotli_extensions[] = { ".br", NULL };
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const struct decoding_backend brotli_decoding_backend = {
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"brotli",
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brotli_extensions,
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brotli_open,
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brotli_read,
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brotli_decode_buffer,
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brotli_close,
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};
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