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/*
**********************************************************************************************
* File: http_content_decompress.c
* Description:
* Authors: LuWenPeng <[email protected]>
* Date: 2022-10-31
* Copyright: (c) Since 2022 Geedge Networks, Ltd. All rights reserved.
***********************************************************************************************
*/
#include <zlib.h>
#include <string.h>
#include <assert.h>
#include <brotli/decode.h>
#include "http_decoder_inc.h"
#define BUFFER_SIZE (16 * 1024)
struct http_content_decompress {
enum http_content_encoding encoding;
z_stream *z_stream_ptr;
BrotliDecoderState *br_state;
char *buffer;
size_t buffer_size;
};
enum http_content_encoding
http_content_encoding_str2int(const char *content_encoding)
{
if (strcasestr(content_encoding, "gzip") != NULL) {
return HTTP_CONTENT_ENCODING_GZIP;
}
if (strcasestr(content_encoding, "deflate") != NULL) {
return HTTP_CONTENT_ENCODING_DEFLATE;
}
if (strcasestr(content_encoding, "br") != NULL) {
return HTTP_CONTENT_ENCODING_BR;
}
return HTTP_CONTENT_ENCODING_NONE;
}
const char *
http_content_encoding_int2str(enum http_content_encoding content_encoding)
{
if (content_encoding == HTTP_CONTENT_ENCODING_GZIP) {
return "gzip";
}
if (content_encoding == HTTP_CONTENT_ENCODING_DEFLATE) {
return "deflate";
}
if (content_encoding == HTTP_CONTENT_ENCODING_BR) {
return "br";
}
return "unknown";
}
struct http_content_decompress *
http_content_decompress_create(enum http_content_encoding encoding)
{
struct http_content_decompress *decompress =
CALLOC(struct http_content_decompress, 1);
assert(decompress);
decompress->encoding = encoding;
decompress->z_stream_ptr = NULL;
decompress->br_state = NULL;
decompress->buffer = CALLOC(char, BUFFER_SIZE);
assert(decompress->buffer);
decompress->buffer_size = BUFFER_SIZE;
if (encoding == HTTP_CONTENT_ENCODING_GZIP
|| encoding == HTTP_CONTENT_ENCODING_DEFLATE) {
decompress->z_stream_ptr = CALLOC(z_stream, 1);
assert(decompress->z_stream_ptr);
decompress->z_stream_ptr->zalloc = NULL;
decompress->z_stream_ptr->zfree = NULL;
decompress->z_stream_ptr->opaque = NULL;
decompress->z_stream_ptr->avail_in = 0;
decompress->z_stream_ptr->next_in = Z_NULL;
if (encoding == HTTP_CONTENT_ENCODING_GZIP) {
if (inflateInit2(decompress->z_stream_ptr, MAX_WBITS + 16)
!= Z_OK) {
goto error;
}
}
if (encoding == HTTP_CONTENT_ENCODING_DEFLATE) {
if (inflateInit2(decompress->z_stream_ptr, -MAX_WBITS) != Z_OK) {
goto error;
}
}
}
if (encoding == HTTP_CONTENT_ENCODING_BR) {
decompress->br_state = BrotliDecoderCreateInstance(NULL, NULL, NULL);
if (decompress->br_state == NULL) {
goto error;
}
}
return decompress;
error:
http_content_decompress_destroy(decompress);
return NULL;
}
void http_content_decompress_destroy(struct http_content_decompress *decompress)
{
if (NULL == decompress) {
return;
}
if (decompress->z_stream_ptr != NULL) {
inflateEnd(decompress->z_stream_ptr);
FREE(decompress->z_stream_ptr);
}
if (decompress->br_state) {
BrotliDecoderDestroyInstance(decompress->br_state);
decompress->br_state = NULL;
}
FREE(decompress->buffer);
FREE(decompress);
}
static int
http_content_decompress_write_zlib(struct http_content_decompress *decompress,
const char *indata, size_t indata_len,
char **outdata, size_t *outdata_len)
{
z_stream *z_stream_ptr = decompress->z_stream_ptr;
z_stream_ptr->avail_in = (unsigned int)indata_len;
z_stream_ptr->next_in = (unsigned char *)indata;
z_stream_ptr->avail_out = (unsigned int)decompress->buffer_size;
z_stream_ptr->next_out = (unsigned char *)decompress->buffer;
*outdata = NULL;
*outdata_len = 0;
do {
int ret = inflate(z_stream_ptr, Z_NO_FLUSH);
if (ret == Z_STREAM_ERROR || ret == Z_NEED_DICT
|| ret == Z_DATA_ERROR || ret == Z_MEM_ERROR) {
(void)inflateEnd(z_stream_ptr);
return -1;
}
size_t have = decompress->buffer_size - z_stream_ptr->avail_out;
if (have > 0) {
if (0 == z_stream_ptr->avail_out) {
decompress->buffer_size += have;
decompress->buffer = REALLOC(char, decompress->buffer,
decompress->buffer_size);
*outdata = decompress->buffer;
*outdata_len = *outdata_len + have;
// http_decoder_log(DEBUG, "%s realloc outbuffer %zu bytes",
// http_content_encoding_int2str(decompress->encoding),
// decompress->buffer_size);
z_stream_ptr->avail_out = have;
z_stream_ptr->next_out = (unsigned char *)decompress->buffer +
(decompress->buffer_size - have);
} else {
*outdata = decompress->buffer;
*outdata_len = have;
}
}
} while (z_stream_ptr->avail_in != 0);
return 0;
}
static int
http_content_decompress_write_br(struct http_content_decompress *decompress,
const char *indata, size_t indata_len,
char **outdata, size_t *outdata_len)
{
size_t available_in = indata_len;
const unsigned char *next_in = (const unsigned char *)indata;
size_t available_out = decompress->buffer_size;
unsigned char *next_out = (unsigned char *)decompress->buffer;
*outdata = NULL;
*outdata_len = 0;
for (;;) {
int ret = BrotliDecoderDecompressStream(decompress->br_state, &available_in,
&next_in, &available_out, &next_out, 0);
size_t have = decompress->buffer_size - available_out;
if (have > 0) {
if (0 == available_out) {
decompress->buffer_size += have;
decompress->buffer = REALLOC(char, decompress->buffer,
decompress->buffer_size);
*outdata = decompress->buffer;
*outdata_len = *outdata_len + have;
available_out = have;
next_out = (unsigned char *)decompress->buffer +
(decompress->buffer_size - have);
} else {
*outdata = decompress->buffer;
*outdata_len = have;
}
}
if (ret == BROTLI_DECODER_RESULT_SUCCESS ||
ret == BROTLI_DECODER_RESULT_NEEDS_MORE_INPUT) {
return 0;
}
if (ret == BROTLI_DECODER_RESULT_ERROR) {
BrotliDecoderErrorCode errcode =
BrotliDecoderGetErrorCode(decompress->br_state);
// http_decoder_log(ERROR,
// "BrotliDecoderDecompressStream() failed: errno = %d, %s",
// errcode, BrotliDecoderErrorString(errcode));
return -1;
}
assert(ret == BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT);
}
}
int http_content_decompress_write(struct http_content_decompress *decompress,
const char *indata, size_t indata_len,
char **outdata, size_t *outdata_len)
{
assert(decompress);
assert(indata);
assert(indata_len > 0);
assert(outdata);
assert(outdata_len);
*outdata = NULL;
*outdata_len = 0;
if (decompress->encoding == HTTP_CONTENT_ENCODING_GZIP ||
decompress->encoding == HTTP_CONTENT_ENCODING_DEFLATE) {
return http_content_decompress_write_zlib(decompress, indata, indata_len,
outdata, outdata_len);
}
if (decompress->encoding == HTTP_CONTENT_ENCODING_BR) {
return http_content_decompress_write_br(decompress, indata, indata_len,
outdata, outdata_len);
}
assert(0);
return -1;
}
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