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[encoding] Read whole file.zst to memory and decompress.

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This commit is contained in:
Witold Filipczyk 2019-07-14 22:25:03 +02:00
parent 90086599da
commit a53486b31d
1 changed files with 56 additions and 60 deletions
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116
src/encoding/zstd.c
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@ -28,14 +28,10 @@ struct zstd_enc_data {
ZSTD_DCtx *zstd_stream;
ZSTD_inBuffer input;
ZSTD_outBuffer output;
size_t sent_pos;
/* The file descriptor from which we read. */
int fdread;
int last_read:1;
/* A buffer for data that has been read from the file but not
* yet decompressed. fbz_stream.next_in and fbz_stream.avail_in
* refer to this buffer. */
unsigned char buf[ELINKS_ZSTD_BUFFER_LENGTH];
int decoded:1;
};
static int
@ -61,60 +57,6 @@ zstd_open(struct stream_encoded *stream, int fd)
return 0;
}
static int
zstd_read(struct stream_encoded *stream, unsigned char *buf, int len)
{
struct zstd_enc_data *data = (struct zstd_enc_data *) stream->data;
int err = 0;
if (!data) return -1;
assert(len > 0);
if (data->last_read) {
return 0;
}
data->output.size = len;
data->output.dst = buf;
data->output.pos = 0;
do {
if (data->output.pos == data->output.size) {
break;
}
if (data->input.pos == data->input.size) {
int l = safe_read(data->fdread, data->buf,
ELINKS_ZSTD_BUFFER_LENGTH);
if (l == -1) {
if (errno == EAGAIN)
break;
else
return -1; /* I/O error */
} else if (l == 0) {
/* EOF. It is error: we wait for more bytes */
return -1;
}
data->input.src = data->buf;
data->input.size = l;
data->input.pos = 0;
}
err = ZSTD_decompressStream(data->zstd_stream, &data->output , &data->input);
if (ZSTD_isError(err)) {
break;
}
} while (data->input.pos < data->input.size);
if (!err) {
data->last_read = 1;
}
return data->output.pos;
}
static unsigned char *
zstd_decode_buffer(struct stream_encoded *st, unsigned char *data, int len, int *new_len)
@ -157,6 +99,60 @@ zstd_decode_buffer(struct stream_encoded *st, unsigned char *data, int len, int
return enc_data->output.dst;
}
static int
zstd_read(struct stream_encoded *stream, unsigned char *buf, int len)
{
struct zstd_enc_data *data = (struct zstd_enc_data *) stream->data;
if (!data) return -1;
assert(len > 0);
if (!data->decoded) {
size_t read_pos = 0;
unsigned char *tmp_buf = malloc(len);
int new_len;
if (!tmp_buf) {
return 0;
}
do {
int l = safe_read(data->fdread, tmp_buf + read_pos, len - read_pos);
if (!l) break;
if (l == -1 && errno == EAGAIN) {
continue;
}
if (l == -1) {
return -1;
}
read_pos += l;
} while (1);
if (zstd_decode_buffer(stream, tmp_buf, len, &new_len)) {
data->decoded = 1;
}
mem_free(tmp_buf);
}
if (data->decoded) {
int length = len < (data->output.pos - data->sent_pos) ? len : (data->output.pos - data->sent_pos);
if (length <= 0) {
mem_free(data->output.dst);
data->output.dst = NULL;
} else {
memcpy(buf, data->output.dst + data->sent_pos, length);
data->sent_pos += length;
}
return length;
}
return -1;
}
static void
zstd_close(struct stream_encoded *stream)
{