[337] | 1 | /***************************************************************************
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| 2 | * _ _ ____ _
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| 3 | * Project ___| | | | _ \| |
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| 4 | * / __| | | | |_) | |
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| 5 | * | (__| |_| | _ <| |___
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| 6 | * \___|\___/|_| \_\_____|
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| 7 | *
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| 8 | * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
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| 9 | *
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| 10 | * This software is licensed as described in the file COPYING, which
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| 11 | * you should have received as part of this distribution. The terms
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| 12 | * are also available at https://curl.haxx.se/docs/copyright.html.
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| 13 | *
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| 14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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| 15 | * copies of the Software, and permit persons to whom the Software is
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| 16 | * furnished to do so, under the terms of the COPYING file.
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| 17 | *
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| 18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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| 19 | * KIND, either express or implied.
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| 20 | *
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| 21 | ***************************************************************************/
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| 22 |
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| 23 | #include "curl_setup.h"
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| 24 |
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| 25 | #include "urldata.h"
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| 26 | #include <curl/curl.h>
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| 27 | #include <stddef.h>
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| 28 |
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| 29 | #ifdef HAVE_ZLIB_H
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| 30 | #include <zlib.h>
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| 31 | #ifdef __SYMBIAN32__
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| 32 | /* zlib pollutes the namespace with this definition */
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| 33 | #undef WIN32
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| 34 | #endif
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| 35 | #endif
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| 36 |
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| 37 | #ifdef HAVE_BROTLI
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| 38 | #include <brotli/decode.h>
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| 39 | #endif
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| 40 |
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| 41 | #include "sendf.h"
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| 42 | #include "http.h"
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| 43 | #include "content_encoding.h"
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| 44 | #include "strdup.h"
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| 45 | #include "strcase.h"
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| 46 | #include "curl_memory.h"
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| 47 | #include "memdebug.h"
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| 48 |
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| 49 | #define CONTENT_ENCODING_DEFAULT "identity"
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| 50 |
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| 51 | #ifndef CURL_DISABLE_HTTP
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| 52 |
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| 53 | #define DSIZ CURL_MAX_WRITE_SIZE /* buffer size for decompressed data */
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| 54 |
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| 55 |
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| 56 | #ifdef HAVE_LIBZ
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| 57 |
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| 58 | /* Comment this out if zlib is always going to be at least ver. 1.2.0.4
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| 59 | (doing so will reduce code size slightly). */
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| 60 | #define OLD_ZLIB_SUPPORT 1
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| 61 |
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| 62 | #define GZIP_MAGIC_0 0x1f
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| 63 | #define GZIP_MAGIC_1 0x8b
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| 64 |
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| 65 | /* gzip flag byte */
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| 66 | #define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
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| 67 | #define HEAD_CRC 0x02 /* bit 1 set: header CRC present */
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| 68 | #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
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| 69 | #define ORIG_NAME 0x08 /* bit 3 set: original file name present */
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| 70 | #define COMMENT 0x10 /* bit 4 set: file comment present */
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| 71 | #define RESERVED 0xE0 /* bits 5..7: reserved */
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| 72 |
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| 73 | typedef enum {
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| 74 | ZLIB_UNINIT, /* uninitialized */
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| 75 | ZLIB_INIT, /* initialized */
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| 76 | ZLIB_GZIP_HEADER, /* reading gzip header */
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| 77 | ZLIB_GZIP_INFLATING, /* inflating gzip stream */
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| 78 | ZLIB_INIT_GZIP /* initialized in transparent gzip mode */
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| 79 | } zlibInitState;
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| 80 |
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| 81 | /* Writer parameters. */
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| 82 | typedef struct {
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| 83 | zlibInitState zlib_init; /* zlib init state */
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| 84 | z_stream z; /* State structure for zlib. */
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| 85 | } zlib_params;
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| 86 |
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| 87 |
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| 88 | static voidpf
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| 89 | zalloc_cb(voidpf opaque, unsigned int items, unsigned int size)
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| 90 | {
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| 91 | (void) opaque;
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| 92 | /* not a typo, keep it calloc() */
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| 93 | return (voidpf) calloc(items, size);
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| 94 | }
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| 95 |
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| 96 | static void
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| 97 | zfree_cb(voidpf opaque, voidpf ptr)
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| 98 | {
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| 99 | (void) opaque;
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| 100 | free(ptr);
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| 101 | }
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| 102 |
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| 103 | static CURLcode
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| 104 | process_zlib_error(struct connectdata *conn, z_stream *z)
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| 105 | {
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| 106 | struct Curl_easy *data = conn->data;
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| 107 | if(z->msg)
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| 108 | failf(data, "Error while processing content unencoding: %s",
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| 109 | z->msg);
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| 110 | else
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| 111 | failf(data, "Error while processing content unencoding: "
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| 112 | "Unknown failure within decompression software.");
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| 113 |
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| 114 | return CURLE_BAD_CONTENT_ENCODING;
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| 115 | }
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| 116 |
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| 117 | static CURLcode
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| 118 | exit_zlib(struct connectdata *conn,
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| 119 | z_stream *z, zlibInitState *zlib_init, CURLcode result)
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| 120 | {
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| 121 | if(*zlib_init == ZLIB_GZIP_HEADER)
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| 122 | Curl_safefree(z->next_in);
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| 123 |
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| 124 | if(*zlib_init != ZLIB_UNINIT) {
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| 125 | if(inflateEnd(z) != Z_OK && result == CURLE_OK)
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| 126 | result = process_zlib_error(conn, z);
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| 127 | *zlib_init = ZLIB_UNINIT;
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| 128 | }
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| 129 |
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| 130 | return result;
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| 131 | }
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| 132 |
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| 133 | static CURLcode
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| 134 | inflate_stream(struct connectdata *conn, contenc_writer *writer)
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| 135 | {
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| 136 | zlib_params *zp = (zlib_params *) &writer->params;
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| 137 | int allow_restart = 1;
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| 138 | z_stream *z = &zp->z; /* zlib state structure */
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| 139 | uInt nread = z->avail_in;
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| 140 | Bytef *orig_in = z->next_in;
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| 141 | int status; /* zlib status */
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| 142 | CURLcode result = CURLE_OK; /* Curl_client_write status */
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| 143 | char *decomp; /* Put the decompressed data here. */
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| 144 |
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| 145 | /* Dynamically allocate a buffer for decompression because it's uncommonly
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| 146 | large to hold on the stack */
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| 147 | decomp = malloc(DSIZ);
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| 148 | if(decomp == NULL) {
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| 149 | return exit_zlib(conn, z, &zp->zlib_init, CURLE_OUT_OF_MEMORY);
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| 150 | }
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| 151 |
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| 152 | /* because the buffer size is fixed, iteratively decompress and transfer to
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| 153 | the client via client_write. */
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| 154 | for(;;) {
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| 155 | if(z->avail_in == 0) {
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| 156 | free(decomp);
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| 157 | return result;
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| 158 | }
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| 159 |
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| 160 | /* (re)set buffer for decompressed output for every iteration */
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| 161 | z->next_out = (Bytef *) decomp;
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| 162 | z->avail_out = DSIZ;
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| 163 |
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| 164 | status = inflate(z, Z_SYNC_FLUSH);
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| 165 | if(status == Z_OK || status == Z_STREAM_END) {
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| 166 | allow_restart = 0;
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| 167 | result = Curl_unencode_write(conn, writer->downstream, decomp,
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| 168 | DSIZ - z->avail_out);
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| 169 | /* if !CURLE_OK, clean up, return */
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| 170 | if(result) {
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| 171 | free(decomp);
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| 172 | return exit_zlib(conn, z, &zp->zlib_init, result);
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| 173 | }
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| 174 |
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| 175 | /* Done? clean up, return */
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| 176 | if(status == Z_STREAM_END) {
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| 177 | free(decomp);
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| 178 | return exit_zlib(conn, z, &zp->zlib_init, result);
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| 179 | }
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| 180 |
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| 181 | /* Done with these bytes, exit */
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| 182 |
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| 183 | /* status is always Z_OK at this point! */
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| 184 | continue;
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| 185 | }
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| 186 | else if(allow_restart && status == Z_DATA_ERROR) {
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| 187 | /* some servers seem to not generate zlib headers, so this is an attempt
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| 188 | to fix and continue anyway */
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| 189 |
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| 190 | (void) inflateEnd(z); /* don't care about the return code */
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| 191 | if(inflateInit2(z, -MAX_WBITS) != Z_OK) {
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| 192 | free(decomp);
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| 193 | zp->zlib_init = ZLIB_UNINIT; /* inflateEnd() already called. */
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| 194 | return exit_zlib(conn, z, &zp->zlib_init, process_zlib_error(conn, z));
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| 195 | }
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| 196 | z->next_in = orig_in;
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| 197 | z->avail_in = nread;
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| 198 | allow_restart = 0;
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| 199 | continue;
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| 200 | }
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| 201 | else { /* Error; exit loop, handle below */
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| 202 | free(decomp);
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| 203 | return exit_zlib(conn, z, &zp->zlib_init, process_zlib_error(conn, z));
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| 204 | }
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| 205 | }
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| 206 | /* UNREACHED */
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| 207 | }
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| 208 |
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| 209 |
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| 210 | /* Deflate handler. */
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| 211 | static CURLcode deflate_init_writer(struct connectdata *conn,
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| 212 | contenc_writer *writer)
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| 213 | {
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| 214 | zlib_params *zp = (zlib_params *) &writer->params;
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| 215 | z_stream *z = &zp->z; /* zlib state structure */
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| 216 |
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| 217 | if(!writer->downstream)
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| 218 | return CURLE_WRITE_ERROR;
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| 219 |
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| 220 | /* Initialize zlib */
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| 221 | z->zalloc = (alloc_func) zalloc_cb;
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| 222 | z->zfree = (free_func) zfree_cb;
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| 223 |
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| 224 | if(inflateInit(z) != Z_OK)
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| 225 | return process_zlib_error(conn, z);
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| 226 | zp->zlib_init = ZLIB_INIT;
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| 227 | return CURLE_OK;
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| 228 | }
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| 229 |
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| 230 | static CURLcode deflate_unencode_write(struct connectdata *conn,
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| 231 | contenc_writer *writer,
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| 232 | const char *buf, size_t nbytes)
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| 233 | {
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| 234 | zlib_params *zp = (zlib_params *) &writer->params;
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| 235 | z_stream *z = &zp->z; /* zlib state structure */
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| 236 |
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| 237 | /* Set the compressed input when this function is called */
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| 238 | z->next_in = (Bytef *) buf;
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| 239 | z->avail_in = (uInt) nbytes;
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| 240 |
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| 241 | /* Now uncompress the data */
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| 242 | return inflate_stream(conn, writer);
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| 243 | }
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| 244 |
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| 245 | static void deflate_close_writer(struct connectdata *conn,
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| 246 | contenc_writer *writer)
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| 247 | {
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| 248 | zlib_params *zp = (zlib_params *) &writer->params;
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| 249 | z_stream *z = &zp->z; /* zlib state structure */
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| 250 |
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| 251 | exit_zlib(conn, z, &zp->zlib_init, CURLE_OK);
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| 252 | }
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| 253 |
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| 254 | static const content_encoding deflate_encoding = {
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| 255 | "deflate",
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| 256 | NULL,
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| 257 | deflate_init_writer,
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| 258 | deflate_unencode_write,
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| 259 | deflate_close_writer,
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| 260 | sizeof(zlib_params)
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| 261 | };
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| 262 |
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| 263 |
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| 264 | /* Gzip handler. */
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| 265 | static CURLcode gzip_init_writer(struct connectdata *conn,
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| 266 | contenc_writer *writer)
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| 267 | {
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| 268 | zlib_params *zp = (zlib_params *) &writer->params;
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| 269 | z_stream *z = &zp->z; /* zlib state structure */
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| 270 |
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| 271 | if(!writer->downstream)
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| 272 | return CURLE_WRITE_ERROR;
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| 273 |
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| 274 | /* Initialize zlib */
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| 275 | z->zalloc = (alloc_func) zalloc_cb;
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| 276 | z->zfree = (free_func) zfree_cb;
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| 277 |
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| 278 | if(strcmp(zlibVersion(), "1.2.0.4") >= 0) {
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| 279 | /* zlib ver. >= 1.2.0.4 supports transparent gzip decompressing */
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| 280 | if(inflateInit2(z, MAX_WBITS + 32) != Z_OK) {
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| 281 | return process_zlib_error(conn, z);
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| 282 | }
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| 283 | zp->zlib_init = ZLIB_INIT_GZIP; /* Transparent gzip decompress state */
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| 284 | }
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| 285 | else {
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| 286 | /* we must parse the gzip header ourselves */
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| 287 | if(inflateInit2(z, -MAX_WBITS) != Z_OK) {
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| 288 | return process_zlib_error(conn, z);
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| 289 | }
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| 290 | zp->zlib_init = ZLIB_INIT; /* Initial call state */
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| 291 | }
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| 292 |
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| 293 | return CURLE_OK;
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| 294 | }
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| 295 |
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| 296 | #ifdef OLD_ZLIB_SUPPORT
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| 297 | /* Skip over the gzip header */
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| 298 | static enum {
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| 299 | GZIP_OK,
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| 300 | GZIP_BAD,
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| 301 | GZIP_UNDERFLOW
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| 302 | } check_gzip_header(unsigned char const *data, ssize_t len, ssize_t *headerlen)
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| 303 | {
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| 304 | int method, flags;
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| 305 | const ssize_t totallen = len;
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| 306 |
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| 307 | /* The shortest header is 10 bytes */
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| 308 | if(len < 10)
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| 309 | return GZIP_UNDERFLOW;
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| 310 |
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| 311 | if((data[0] != GZIP_MAGIC_0) || (data[1] != GZIP_MAGIC_1))
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| 312 | return GZIP_BAD;
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| 313 |
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| 314 | method = data[2];
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| 315 | flags = data[3];
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| 316 |
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| 317 | if(method != Z_DEFLATED || (flags & RESERVED) != 0) {
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| 318 | /* Can't handle this compression method or unknown flag */
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| 319 | return GZIP_BAD;
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| 320 | }
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| 321 |
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| 322 | /* Skip over time, xflags, OS code and all previous bytes */
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| 323 | len -= 10;
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| 324 | data += 10;
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| 325 |
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| 326 | if(flags & EXTRA_FIELD) {
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| 327 | ssize_t extra_len;
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| 328 |
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| 329 | if(len < 2)
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| 330 | return GZIP_UNDERFLOW;
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| 331 |
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| 332 | extra_len = (data[1] << 8) | data[0];
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| 333 |
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| 334 | if(len < (extra_len + 2))
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| 335 | return GZIP_UNDERFLOW;
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| 336 |
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| 337 | len -= (extra_len + 2);
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| 338 | data += (extra_len + 2);
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| 339 | }
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| 340 |
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| 341 | if(flags & ORIG_NAME) {
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| 342 | /* Skip over NUL-terminated file name */
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| 343 | while(len && *data) {
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| 344 | --len;
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| 345 | ++data;
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| 346 | }
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| 347 | if(!len || *data)
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| 348 | return GZIP_UNDERFLOW;
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| 349 |
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| 350 | /* Skip over the NUL */
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| 351 | --len;
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| 352 | ++data;
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| 353 | }
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| 354 |
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| 355 | if(flags & COMMENT) {
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| 356 | /* Skip over NUL-terminated comment */
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| 357 | while(len && *data) {
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| 358 | --len;
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| 359 | ++data;
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| 360 | }
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| 361 | if(!len || *data)
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| 362 | return GZIP_UNDERFLOW;
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| 363 |
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| 364 | /* Skip over the NUL */
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| 365 | --len;
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| 366 | }
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| 367 |
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| 368 | if(flags & HEAD_CRC) {
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| 369 | if(len < 2)
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| 370 | return GZIP_UNDERFLOW;
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| 371 |
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| 372 | len -= 2;
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| 373 | }
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| 374 |
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| 375 | *headerlen = totallen - len;
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| 376 | return GZIP_OK;
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| 377 | }
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| 378 | #endif
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| 379 |
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| 380 | static CURLcode gzip_unencode_write(struct connectdata *conn,
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| 381 | contenc_writer *writer,
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| 382 | const char *buf, size_t nbytes)
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| 383 | {
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| 384 | zlib_params *zp = (zlib_params *) &writer->params;
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| 385 | z_stream *z = &zp->z; /* zlib state structure */
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| 386 |
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| 387 | if(zp->zlib_init == ZLIB_INIT_GZIP) {
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| 388 | /* Let zlib handle the gzip decompression entirely */
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| 389 | z->next_in = (Bytef *) buf;
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| 390 | z->avail_in = (uInt) nbytes;
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| 391 | /* Now uncompress the data */
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| 392 | return inflate_stream(conn, writer);
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| 393 | }
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| 394 |
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| 395 | #ifndef OLD_ZLIB_SUPPORT
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| 396 | /* Support for old zlib versions is compiled away and we are running with
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| 397 | an old version, so return an error. */
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| 398 | return exit_zlib(conn, z, &zp->zlib_init, CURLE_WRITE_ERROR);
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| 399 |
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| 400 | #else
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| 401 | /* This next mess is to get around the potential case where there isn't
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| 402 | * enough data passed in to skip over the gzip header. If that happens, we
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| 403 | * malloc a block and copy what we have then wait for the next call. If
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| 404 | * there still isn't enough (this is definitely a worst-case scenario), we
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| 405 | * make the block bigger, copy the next part in and keep waiting.
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| 406 | *
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| 407 | * This is only required with zlib versions < 1.2.0.4 as newer versions
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| 408 | * can handle the gzip header themselves.
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| 409 | */
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| 410 |
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| 411 | switch(zp->zlib_init) {
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| 412 | /* Skip over gzip header? */
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| 413 | case ZLIB_INIT:
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| 414 | {
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| 415 | /* Initial call state */
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| 416 | ssize_t hlen;
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| 417 |
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| 418 | switch(check_gzip_header((unsigned char *) buf, nbytes, &hlen)) {
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| 419 | case GZIP_OK:
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| 420 | z->next_in = (Bytef *) buf + hlen;
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| 421 | z->avail_in = (uInt) (nbytes - hlen);
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| 422 | zp->zlib_init = ZLIB_GZIP_INFLATING; /* Inflating stream state */
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| 423 | break;
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| 424 |
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| 425 | case GZIP_UNDERFLOW:
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| 426 | /* We need more data so we can find the end of the gzip header. It's
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| 427 | * possible that the memory block we malloc here will never be freed if
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| 428 | * the transfer abruptly aborts after this point. Since it's unlikely
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| 429 | * that circumstances will be right for this code path to be followed in
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| 430 | * the first place, and it's even more unlikely for a transfer to fail
|
---|
| 431 | * immediately afterwards, it should seldom be a problem.
|
---|
| 432 | */
|
---|
| 433 | z->avail_in = (uInt) nbytes;
|
---|
| 434 | z->next_in = malloc(z->avail_in);
|
---|
| 435 | if(z->next_in == NULL) {
|
---|
| 436 | return exit_zlib(conn, z, &zp->zlib_init, CURLE_OUT_OF_MEMORY);
|
---|
| 437 | }
|
---|
| 438 | memcpy(z->next_in, buf, z->avail_in);
|
---|
| 439 | zp->zlib_init = ZLIB_GZIP_HEADER; /* Need more gzip header data state */
|
---|
| 440 | /* We don't have any data to inflate yet */
|
---|
| 441 | return CURLE_OK;
|
---|
| 442 |
|
---|
| 443 | case GZIP_BAD:
|
---|
| 444 | default:
|
---|
| 445 | return exit_zlib(conn, z, &zp->zlib_init, process_zlib_error(conn, z));
|
---|
| 446 | }
|
---|
| 447 |
|
---|
| 448 | }
|
---|
| 449 | break;
|
---|
| 450 |
|
---|
| 451 | case ZLIB_GZIP_HEADER:
|
---|
| 452 | {
|
---|
| 453 | /* Need more gzip header data state */
|
---|
| 454 | ssize_t hlen;
|
---|
| 455 | z->avail_in += (uInt) nbytes;
|
---|
| 456 | z->next_in = Curl_saferealloc(z->next_in, z->avail_in);
|
---|
| 457 | if(z->next_in == NULL) {
|
---|
| 458 | return exit_zlib(conn, z, &zp->zlib_init, CURLE_OUT_OF_MEMORY);
|
---|
| 459 | }
|
---|
| 460 | /* Append the new block of data to the previous one */
|
---|
| 461 | memcpy(z->next_in + z->avail_in - nbytes, buf, nbytes);
|
---|
| 462 |
|
---|
| 463 | switch(check_gzip_header(z->next_in, z->avail_in, &hlen)) {
|
---|
| 464 | case GZIP_OK:
|
---|
| 465 | /* This is the zlib stream data */
|
---|
| 466 | free(z->next_in);
|
---|
| 467 | /* Don't point into the malloced block since we just freed it */
|
---|
| 468 | z->next_in = (Bytef *) buf + hlen + nbytes - z->avail_in;
|
---|
| 469 | z->avail_in = (uInt) (z->avail_in - hlen);
|
---|
| 470 | zp->zlib_init = ZLIB_GZIP_INFLATING; /* Inflating stream state */
|
---|
| 471 | break;
|
---|
| 472 |
|
---|
| 473 | case GZIP_UNDERFLOW:
|
---|
| 474 | /* We still don't have any data to inflate! */
|
---|
| 475 | return CURLE_OK;
|
---|
| 476 |
|
---|
| 477 | case GZIP_BAD:
|
---|
| 478 | default:
|
---|
| 479 | return exit_zlib(conn, z, &zp->zlib_init, process_zlib_error(conn, z));
|
---|
| 480 | }
|
---|
| 481 |
|
---|
| 482 | }
|
---|
| 483 | break;
|
---|
| 484 |
|
---|
| 485 | case ZLIB_GZIP_INFLATING:
|
---|
| 486 | default:
|
---|
| 487 | /* Inflating stream state */
|
---|
| 488 | z->next_in = (Bytef *) buf;
|
---|
| 489 | z->avail_in = (uInt) nbytes;
|
---|
| 490 | break;
|
---|
| 491 | }
|
---|
| 492 |
|
---|
| 493 | if(z->avail_in == 0) {
|
---|
| 494 | /* We don't have any data to inflate; wait until next time */
|
---|
| 495 | return CURLE_OK;
|
---|
| 496 | }
|
---|
| 497 |
|
---|
| 498 | /* We've parsed the header, now uncompress the data */
|
---|
| 499 | return inflate_stream(conn, writer);
|
---|
| 500 | #endif
|
---|
| 501 | }
|
---|
| 502 |
|
---|
| 503 | static void gzip_close_writer(struct connectdata *conn,
|
---|
| 504 | contenc_writer *writer)
|
---|
| 505 | {
|
---|
| 506 | zlib_params *zp = (zlib_params *) &writer->params;
|
---|
| 507 | z_stream *z = &zp->z; /* zlib state structure */
|
---|
| 508 |
|
---|
| 509 | exit_zlib(conn, z, &zp->zlib_init, CURLE_OK);
|
---|
| 510 | }
|
---|
| 511 |
|
---|
| 512 | static const content_encoding gzip_encoding = {
|
---|
| 513 | "gzip",
|
---|
| 514 | "x-gzip",
|
---|
| 515 | gzip_init_writer,
|
---|
| 516 | gzip_unencode_write,
|
---|
| 517 | gzip_close_writer,
|
---|
| 518 | sizeof(zlib_params)
|
---|
| 519 | };
|
---|
| 520 |
|
---|
| 521 | #endif /* HAVE_LIBZ */
|
---|
| 522 |
|
---|
| 523 |
|
---|
| 524 | #ifdef HAVE_BROTLI
|
---|
| 525 |
|
---|
| 526 | /* Writer parameters. */
|
---|
| 527 | typedef struct {
|
---|
| 528 | BrotliDecoderState *br; /* State structure for brotli. */
|
---|
| 529 | } brotli_params;
|
---|
| 530 |
|
---|
| 531 |
|
---|
| 532 | static CURLcode brotli_map_error(BrotliDecoderErrorCode be)
|
---|
| 533 | {
|
---|
| 534 | switch(be) {
|
---|
| 535 | case BROTLI_DECODER_ERROR_FORMAT_EXUBERANT_NIBBLE:
|
---|
| 536 | case BROTLI_DECODER_ERROR_FORMAT_EXUBERANT_META_NIBBLE:
|
---|
| 537 | case BROTLI_DECODER_ERROR_FORMAT_SIMPLE_HUFFMAN_ALPHABET:
|
---|
| 538 | case BROTLI_DECODER_ERROR_FORMAT_SIMPLE_HUFFMAN_SAME:
|
---|
| 539 | case BROTLI_DECODER_ERROR_FORMAT_CL_SPACE:
|
---|
| 540 | case BROTLI_DECODER_ERROR_FORMAT_HUFFMAN_SPACE:
|
---|
| 541 | case BROTLI_DECODER_ERROR_FORMAT_CONTEXT_MAP_REPEAT:
|
---|
| 542 | case BROTLI_DECODER_ERROR_FORMAT_BLOCK_LENGTH_1:
|
---|
| 543 | case BROTLI_DECODER_ERROR_FORMAT_BLOCK_LENGTH_2:
|
---|
| 544 | case BROTLI_DECODER_ERROR_FORMAT_TRANSFORM:
|
---|
| 545 | case BROTLI_DECODER_ERROR_FORMAT_DICTIONARY:
|
---|
| 546 | case BROTLI_DECODER_ERROR_FORMAT_WINDOW_BITS:
|
---|
| 547 | case BROTLI_DECODER_ERROR_FORMAT_PADDING_1:
|
---|
| 548 | case BROTLI_DECODER_ERROR_FORMAT_PADDING_2:
|
---|
| 549 | case BROTLI_DECODER_ERROR_COMPOUND_DICTIONARY:
|
---|
| 550 | case BROTLI_DECODER_ERROR_DICTIONARY_NOT_SET:
|
---|
| 551 | case BROTLI_DECODER_ERROR_INVALID_ARGUMENTS:
|
---|
| 552 | return CURLE_BAD_CONTENT_ENCODING;
|
---|
| 553 | case BROTLI_DECODER_ERROR_ALLOC_CONTEXT_MODES:
|
---|
| 554 | case BROTLI_DECODER_ERROR_ALLOC_TREE_GROUPS:
|
---|
| 555 | case BROTLI_DECODER_ERROR_ALLOC_CONTEXT_MAP:
|
---|
| 556 | case BROTLI_DECODER_ERROR_ALLOC_RING_BUFFER_1:
|
---|
| 557 | case BROTLI_DECODER_ERROR_ALLOC_RING_BUFFER_2:
|
---|
| 558 | case BROTLI_DECODER_ERROR_ALLOC_BLOCK_TYPE_TREES:
|
---|
| 559 | return CURLE_OUT_OF_MEMORY;
|
---|
| 560 | default:
|
---|
| 561 | break;
|
---|
| 562 | }
|
---|
| 563 | return CURLE_WRITE_ERROR;
|
---|
| 564 | }
|
---|
| 565 |
|
---|
| 566 | static CURLcode brotli_init_writer(struct connectdata *conn,
|
---|
| 567 | contenc_writer *writer)
|
---|
| 568 | {
|
---|
| 569 | brotli_params *bp = (brotli_params *) &writer->params;
|
---|
| 570 |
|
---|
| 571 | (void) conn;
|
---|
| 572 |
|
---|
| 573 | if(!writer->downstream)
|
---|
| 574 | return CURLE_WRITE_ERROR;
|
---|
| 575 |
|
---|
| 576 | bp->br = BrotliDecoderCreateInstance(NULL, NULL, NULL);
|
---|
| 577 | return bp->br? CURLE_OK: CURLE_OUT_OF_MEMORY;
|
---|
| 578 | }
|
---|
| 579 |
|
---|
| 580 | static CURLcode brotli_unencode_write(struct connectdata *conn,
|
---|
| 581 | contenc_writer *writer,
|
---|
| 582 | const char *buf, size_t nbytes)
|
---|
| 583 | {
|
---|
| 584 | brotli_params *bp = (brotli_params *) &writer->params;
|
---|
| 585 | const uint8_t *src = (const uint8_t *) buf;
|
---|
| 586 | char *decomp;
|
---|
| 587 | uint8_t *dst;
|
---|
| 588 | size_t dstleft;
|
---|
| 589 | CURLcode result = CURLE_OK;
|
---|
| 590 |
|
---|
| 591 | if(!bp->br)
|
---|
| 592 | return CURLE_WRITE_ERROR; /* Stream already ended. */
|
---|
| 593 |
|
---|
| 594 | decomp = malloc(DSIZ);
|
---|
| 595 | if(!decomp)
|
---|
| 596 | return CURLE_OUT_OF_MEMORY;
|
---|
| 597 |
|
---|
| 598 | while(nbytes && result == CURLE_OK) {
|
---|
| 599 | BrotliDecoderResult r;
|
---|
| 600 |
|
---|
| 601 | dst = (uint8_t *) decomp;
|
---|
| 602 | dstleft = DSIZ;
|
---|
| 603 | r = BrotliDecoderDecompressStream(bp->br,
|
---|
| 604 | &nbytes, &src, &dstleft, &dst, NULL);
|
---|
| 605 | result = Curl_unencode_write(conn, writer->downstream,
|
---|
| 606 | decomp, DSIZ - dstleft);
|
---|
| 607 | if(result)
|
---|
| 608 | break;
|
---|
| 609 | switch(r) {
|
---|
| 610 | case BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT:
|
---|
| 611 | case BROTLI_DECODER_RESULT_NEEDS_MORE_INPUT:
|
---|
| 612 | break;
|
---|
| 613 | case BROTLI_DECODER_RESULT_SUCCESS:
|
---|
| 614 | BrotliDecoderDestroyInstance(bp->br);
|
---|
| 615 | bp->br = NULL;
|
---|
| 616 | if(nbytes)
|
---|
| 617 | result = CURLE_WRITE_ERROR;
|
---|
| 618 | break;
|
---|
| 619 | default:
|
---|
| 620 | result = brotli_map_error(BrotliDecoderGetErrorCode(bp->br));
|
---|
| 621 | break;
|
---|
| 622 | }
|
---|
| 623 | }
|
---|
| 624 | free(decomp);
|
---|
| 625 | return result;
|
---|
| 626 | }
|
---|
| 627 |
|
---|
| 628 | static void brotli_close_writer(struct connectdata *conn,
|
---|
| 629 | contenc_writer *writer)
|
---|
| 630 | {
|
---|
| 631 | brotli_params *bp = (brotli_params *) &writer->params;
|
---|
| 632 |
|
---|
| 633 | (void) conn;
|
---|
| 634 |
|
---|
| 635 | if(bp->br) {
|
---|
| 636 | BrotliDecoderDestroyInstance(bp->br);
|
---|
| 637 | bp->br = NULL;
|
---|
| 638 | }
|
---|
| 639 | }
|
---|
| 640 |
|
---|
| 641 | static const content_encoding brotli_encoding = {
|
---|
| 642 | "br",
|
---|
| 643 | NULL,
|
---|
| 644 | brotli_init_writer,
|
---|
| 645 | brotli_unencode_write,
|
---|
| 646 | brotli_close_writer,
|
---|
| 647 | sizeof(brotli_params)
|
---|
| 648 | };
|
---|
| 649 | #endif
|
---|
| 650 |
|
---|
| 651 |
|
---|
| 652 | /* Identity handler. */
|
---|
| 653 | static CURLcode identity_init_writer(struct connectdata *conn,
|
---|
| 654 | contenc_writer *writer)
|
---|
| 655 | {
|
---|
| 656 | (void) conn;
|
---|
| 657 | return writer->downstream? CURLE_OK: CURLE_WRITE_ERROR;
|
---|
| 658 | }
|
---|
| 659 |
|
---|
| 660 | static CURLcode identity_unencode_write(struct connectdata *conn,
|
---|
| 661 | contenc_writer *writer,
|
---|
| 662 | const char *buf, size_t nbytes)
|
---|
| 663 | {
|
---|
| 664 | return Curl_unencode_write(conn, writer->downstream, buf, nbytes);
|
---|
| 665 | }
|
---|
| 666 |
|
---|
| 667 | static void identity_close_writer(struct connectdata *conn,
|
---|
| 668 | contenc_writer *writer)
|
---|
| 669 | {
|
---|
| 670 | (void) conn;
|
---|
| 671 | (void) writer;
|
---|
| 672 | }
|
---|
| 673 |
|
---|
| 674 | static const content_encoding identity_encoding = {
|
---|
| 675 | "identity",
|
---|
| 676 | NULL,
|
---|
| 677 | identity_init_writer,
|
---|
| 678 | identity_unencode_write,
|
---|
| 679 | identity_close_writer,
|
---|
| 680 | 0
|
---|
| 681 | };
|
---|
| 682 |
|
---|
| 683 |
|
---|
| 684 | /* supported content encodings table. */
|
---|
| 685 | static const content_encoding * const encodings[] = {
|
---|
| 686 | &identity_encoding,
|
---|
| 687 | #ifdef HAVE_LIBZ
|
---|
| 688 | &deflate_encoding,
|
---|
| 689 | &gzip_encoding,
|
---|
| 690 | #endif
|
---|
| 691 | #ifdef HAVE_BROTLI
|
---|
| 692 | &brotli_encoding,
|
---|
| 693 | #endif
|
---|
| 694 | NULL
|
---|
| 695 | };
|
---|
| 696 |
|
---|
| 697 |
|
---|
| 698 | /* Return a list of comma-separated names of supported encodings. */
|
---|
| 699 | char *Curl_all_content_encodings(void)
|
---|
| 700 | {
|
---|
| 701 | size_t len = 0;
|
---|
| 702 | const content_encoding * const *cep;
|
---|
| 703 | const content_encoding *ce;
|
---|
| 704 | char *ace;
|
---|
| 705 | char *p;
|
---|
| 706 |
|
---|
| 707 | for(cep = encodings; *cep; cep++) {
|
---|
| 708 | ce = *cep;
|
---|
| 709 | if(!strcasecompare(ce->name, CONTENT_ENCODING_DEFAULT))
|
---|
| 710 | len += strlen(ce->name) + 2;
|
---|
| 711 | }
|
---|
| 712 |
|
---|
| 713 | if(!len)
|
---|
| 714 | return strdup(CONTENT_ENCODING_DEFAULT);
|
---|
| 715 |
|
---|
| 716 | ace = malloc(len);
|
---|
| 717 | if(ace) {
|
---|
| 718 | p = ace;
|
---|
| 719 | for(cep = encodings; *cep; cep++) {
|
---|
| 720 | ce = *cep;
|
---|
| 721 | if(!strcasecompare(ce->name, CONTENT_ENCODING_DEFAULT)) {
|
---|
| 722 | strcpy(p, ce->name);
|
---|
| 723 | p += strlen(p);
|
---|
| 724 | *p++ = ',';
|
---|
| 725 | *p++ = ' ';
|
---|
| 726 | }
|
---|
| 727 | }
|
---|
| 728 | p[-2] = '\0';
|
---|
| 729 | }
|
---|
| 730 |
|
---|
| 731 | return ace;
|
---|
| 732 | }
|
---|
| 733 |
|
---|
| 734 |
|
---|
| 735 | /* Real client writer: no downstream. */
|
---|
| 736 | static CURLcode client_init_writer(struct connectdata *conn,
|
---|
| 737 | contenc_writer *writer)
|
---|
| 738 | {
|
---|
| 739 | (void) conn;
|
---|
| 740 | return writer->downstream? CURLE_WRITE_ERROR: CURLE_OK;
|
---|
| 741 | }
|
---|
| 742 |
|
---|
| 743 | static CURLcode client_unencode_write(struct connectdata *conn,
|
---|
| 744 | contenc_writer *writer,
|
---|
| 745 | const char *buf, size_t nbytes)
|
---|
| 746 | {
|
---|
| 747 | struct Curl_easy *data = conn->data;
|
---|
| 748 | struct SingleRequest *k = &data->req;
|
---|
| 749 |
|
---|
| 750 | (void) writer;
|
---|
| 751 |
|
---|
| 752 | if(!nbytes || k->ignorebody)
|
---|
| 753 | return CURLE_OK;
|
---|
| 754 |
|
---|
| 755 | return Curl_client_write(conn, CLIENTWRITE_BODY, (char *) buf, nbytes);
|
---|
| 756 | }
|
---|
| 757 |
|
---|
| 758 | static void client_close_writer(struct connectdata *conn,
|
---|
| 759 | contenc_writer *writer)
|
---|
| 760 | {
|
---|
| 761 | (void) conn;
|
---|
| 762 | (void) writer;
|
---|
| 763 | }
|
---|
| 764 |
|
---|
| 765 | static const content_encoding client_encoding = {
|
---|
| 766 | NULL,
|
---|
| 767 | NULL,
|
---|
| 768 | client_init_writer,
|
---|
| 769 | client_unencode_write,
|
---|
| 770 | client_close_writer,
|
---|
| 771 | 0
|
---|
| 772 | };
|
---|
| 773 |
|
---|
| 774 |
|
---|
| 775 | /* Deferred error dummy writer. */
|
---|
| 776 | static CURLcode error_init_writer(struct connectdata *conn,
|
---|
| 777 | contenc_writer *writer)
|
---|
| 778 | {
|
---|
| 779 | (void) conn;
|
---|
| 780 | return writer->downstream? CURLE_OK: CURLE_WRITE_ERROR;
|
---|
| 781 | }
|
---|
| 782 |
|
---|
| 783 | static CURLcode error_unencode_write(struct connectdata *conn,
|
---|
| 784 | contenc_writer *writer,
|
---|
| 785 | const char *buf, size_t nbytes)
|
---|
| 786 | {
|
---|
| 787 | char *all = Curl_all_content_encodings();
|
---|
| 788 |
|
---|
| 789 | (void) writer;
|
---|
| 790 | (void) buf;
|
---|
| 791 | (void) nbytes;
|
---|
| 792 |
|
---|
| 793 | if(!all)
|
---|
| 794 | return CURLE_OUT_OF_MEMORY;
|
---|
| 795 | failf(conn->data, "Unrecognized content encoding type. "
|
---|
| 796 | "libcurl understands %s content encodings.", all);
|
---|
| 797 | free(all);
|
---|
| 798 | return CURLE_BAD_CONTENT_ENCODING;
|
---|
| 799 | }
|
---|
| 800 |
|
---|
| 801 | static void error_close_writer(struct connectdata *conn,
|
---|
| 802 | contenc_writer *writer)
|
---|
| 803 | {
|
---|
| 804 | (void) conn;
|
---|
| 805 | (void) writer;
|
---|
| 806 | }
|
---|
| 807 |
|
---|
| 808 | static const content_encoding error_encoding = {
|
---|
| 809 | NULL,
|
---|
| 810 | NULL,
|
---|
| 811 | error_init_writer,
|
---|
| 812 | error_unencode_write,
|
---|
| 813 | error_close_writer,
|
---|
| 814 | 0
|
---|
| 815 | };
|
---|
| 816 |
|
---|
| 817 | /* Create an unencoding writer stage using the given handler. */
|
---|
| 818 | static contenc_writer *new_unencoding_writer(struct connectdata *conn,
|
---|
| 819 | const content_encoding *handler,
|
---|
| 820 | contenc_writer *downstream)
|
---|
| 821 | {
|
---|
| 822 | size_t sz = offsetof(contenc_writer, params) + handler->paramsize;
|
---|
| 823 | contenc_writer *writer = (contenc_writer *) malloc(sz);
|
---|
| 824 |
|
---|
| 825 | if(writer) {
|
---|
| 826 | memset(writer, 0, sz);
|
---|
| 827 | writer->handler = handler;
|
---|
| 828 | writer->downstream = downstream;
|
---|
| 829 | if(handler->init_writer(conn, writer)) {
|
---|
| 830 | free(writer);
|
---|
| 831 | writer = NULL;
|
---|
| 832 | }
|
---|
| 833 | }
|
---|
| 834 |
|
---|
| 835 | return writer;
|
---|
| 836 | }
|
---|
| 837 |
|
---|
| 838 | /* Write data using an unencoding writer stack. */
|
---|
| 839 | CURLcode Curl_unencode_write(struct connectdata *conn, contenc_writer *writer,
|
---|
| 840 | const char *buf, size_t nbytes)
|
---|
| 841 | {
|
---|
| 842 | if(!nbytes)
|
---|
| 843 | return CURLE_OK;
|
---|
| 844 | return writer->handler->unencode_write(conn, writer, buf, nbytes);
|
---|
| 845 | }
|
---|
| 846 |
|
---|
| 847 | /* Close and clean-up the connection's writer stack. */
|
---|
| 848 | void Curl_unencode_cleanup(struct connectdata *conn)
|
---|
| 849 | {
|
---|
| 850 | struct Curl_easy *data = conn->data;
|
---|
| 851 | struct SingleRequest *k = &data->req;
|
---|
| 852 | contenc_writer *writer = k->writer_stack;
|
---|
| 853 |
|
---|
| 854 | while(writer) {
|
---|
| 855 | k->writer_stack = writer->downstream;
|
---|
| 856 | writer->handler->close_writer(conn, writer);
|
---|
| 857 | free(writer);
|
---|
| 858 | writer = k->writer_stack;
|
---|
| 859 | }
|
---|
| 860 | }
|
---|
| 861 |
|
---|
| 862 | /* Find the content encoding by name. */
|
---|
| 863 | static const content_encoding *find_encoding(const char *name, size_t len)
|
---|
| 864 | {
|
---|
| 865 | const content_encoding * const *cep;
|
---|
| 866 | const content_encoding *ce;
|
---|
| 867 |
|
---|
| 868 | for(cep = encodings; *cep; cep++) {
|
---|
| 869 | ce = *cep;
|
---|
| 870 | if((strncasecompare(name, ce->name, len) && !ce->name[len]) ||
|
---|
| 871 | (ce->alias && strncasecompare(name, ce->alias, len) && !ce->alias[len]))
|
---|
| 872 | return ce;
|
---|
| 873 | }
|
---|
| 874 | return NULL;
|
---|
| 875 | }
|
---|
| 876 |
|
---|
| 877 | /* Set-up the unencoding stack from the Content-Encoding header value.
|
---|
| 878 | * See RFC 7231 section 3.1.2.2. */
|
---|
| 879 | CURLcode Curl_build_unencoding_stack(struct connectdata *conn,
|
---|
| 880 | const char *enclist, int maybechunked)
|
---|
| 881 | {
|
---|
| 882 | struct Curl_easy *data = conn->data;
|
---|
| 883 | struct SingleRequest *k = &data->req;
|
---|
| 884 |
|
---|
| 885 | do {
|
---|
| 886 | const char *name;
|
---|
| 887 | size_t namelen;
|
---|
| 888 |
|
---|
| 889 | /* Parse a single encoding name. */
|
---|
| 890 | while(ISSPACE(*enclist) || *enclist == ',')
|
---|
| 891 | enclist++;
|
---|
| 892 |
|
---|
| 893 | name = enclist;
|
---|
| 894 |
|
---|
| 895 | for(namelen = 0; *enclist && *enclist != ','; enclist++)
|
---|
| 896 | if(!ISSPACE(*enclist))
|
---|
| 897 | namelen = enclist - name + 1;
|
---|
| 898 |
|
---|
| 899 | /* Special case: chunked encoding is handled at the reader level. */
|
---|
| 900 | if(maybechunked && namelen == 7 && strncasecompare(name, "chunked", 7)) {
|
---|
| 901 | k->chunk = TRUE; /* chunks coming our way. */
|
---|
| 902 | Curl_httpchunk_init(conn); /* init our chunky engine. */
|
---|
| 903 | }
|
---|
| 904 | else if(namelen) {
|
---|
| 905 | const content_encoding *encoding = find_encoding(name, namelen);
|
---|
| 906 | contenc_writer *writer;
|
---|
| 907 |
|
---|
| 908 | if(!k->writer_stack) {
|
---|
| 909 | k->writer_stack = new_unencoding_writer(conn, &client_encoding, NULL);
|
---|
| 910 |
|
---|
| 911 | if(!k->writer_stack)
|
---|
| 912 | return CURLE_OUT_OF_MEMORY;
|
---|
| 913 | }
|
---|
| 914 |
|
---|
| 915 | if(!encoding)
|
---|
| 916 | encoding = &error_encoding; /* Defer error at stack use. */
|
---|
| 917 |
|
---|
| 918 | /* Stack the unencoding stage. */
|
---|
| 919 | writer = new_unencoding_writer(conn, encoding, k->writer_stack);
|
---|
| 920 | if(!writer)
|
---|
| 921 | return CURLE_OUT_OF_MEMORY;
|
---|
| 922 | k->writer_stack = writer;
|
---|
| 923 | }
|
---|
| 924 | } while(*enclist);
|
---|
| 925 |
|
---|
| 926 | return CURLE_OK;
|
---|
| 927 | }
|
---|
| 928 |
|
---|
| 929 | #else
|
---|
| 930 | /* Stubs for builds without HTTP. */
|
---|
| 931 | CURLcode Curl_build_unencoding_stack(struct connectdata *conn,
|
---|
| 932 | const char *enclist, int maybechunked)
|
---|
| 933 | {
|
---|
| 934 | (void) conn;
|
---|
| 935 | (void) enclist;
|
---|
| 936 | (void) maybechunked;
|
---|
| 937 | return CURLE_NOT_BUILT_IN;
|
---|
| 938 | }
|
---|
| 939 |
|
---|
| 940 | CURLcode Curl_unencode_write(struct connectdata *conn, contenc_writer *writer,
|
---|
| 941 | const char *buf, size_t nbytes)
|
---|
| 942 | {
|
---|
| 943 | (void) conn;
|
---|
| 944 | (void) writer;
|
---|
| 945 | (void) buf;
|
---|
| 946 | (void) nbytes;
|
---|
| 947 | return CURLE_NOT_BUILT_IN;
|
---|
| 948 | }
|
---|
| 949 |
|
---|
| 950 | void Curl_unencode_cleanup(struct connectdata *conn)
|
---|
| 951 | {
|
---|
| 952 | (void) conn;
|
---|
| 953 | }
|
---|
| 954 |
|
---|
| 955 | char *Curl_all_content_encodings(void)
|
---|
| 956 | {
|
---|
| 957 | return strdup(CONTENT_ENCODING_DEFAULT); /* Satisfy caller. */
|
---|
| 958 | }
|
---|
| 959 |
|
---|
| 960 | #endif /* CURL_DISABLE_HTTP */
|
---|