diff options
Diffstat (limited to 'lib/content_encoding.c')
| -rw-r--r-- | lib/content_encoding.c | 739 |
1 files changed, 634 insertions, 105 deletions
diff --git a/lib/content_encoding.c b/lib/content_encoding.c index 652ed976..3d061375 100644 --- a/lib/content_encoding.c +++ b/lib/content_encoding.c @@ -5,7 +5,7 @@ * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * - * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al. + * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms @@ -22,22 +22,43 @@ #include "curl_setup.h" -#ifdef HAVE_LIBZ - #include "urldata.h" #include <curl/curl.h> +#include <stddef.h> + +#ifdef HAVE_ZLIB_H +#include <zlib.h> +#ifdef __SYMBIAN32__ +/* zlib pollutes the namespace with this definition */ +#undef WIN32 +#endif +#endif + +#ifdef HAVE_BROTLI +#include <brotli/decode.h> +#endif + #include "sendf.h" +#include "http.h" #include "content_encoding.h" #include "strdup.h" +#include "strcase.h" #include "curl_memory.h" #include "memdebug.h" +#define CONTENT_ENCODING_DEFAULT "identity" + +#ifndef CURL_DISABLE_HTTP + +#define DSIZ CURL_MAX_WRITE_SIZE /* buffer size for decompressed data */ + + +#ifdef HAVE_LIBZ + /* Comment this out if zlib is always going to be at least ver. 1.2.0.4 (doing so will reduce code size slightly). */ #define OLD_ZLIB_SUPPORT 1 -#define DSIZ CURL_MAX_WRITE_SIZE /* buffer size for decompressed data */ - #define GZIP_MAGIC_0 0x1f #define GZIP_MAGIC_1 0x8b @@ -49,6 +70,21 @@ #define COMMENT 0x10 /* bit 4 set: file comment present */ #define RESERVED 0xE0 /* bits 5..7: reserved */ +typedef enum { + ZLIB_UNINIT, /* uninitialized */ + ZLIB_INIT, /* initialized */ + ZLIB_GZIP_HEADER, /* reading gzip header */ + ZLIB_GZIP_INFLATING, /* inflating gzip stream */ + ZLIB_INIT_GZIP /* initialized in transparent gzip mode */ +} zlibInitState; + +/* Writer parameters. */ +typedef struct { + zlibInitState zlib_init; /* zlib init state */ + z_stream z; /* State structure for zlib. */ +} zlib_params; + + static voidpf zalloc_cb(voidpf opaque, unsigned int items, unsigned int size) { @@ -79,19 +115,27 @@ process_zlib_error(struct connectdata *conn, z_stream *z) } static CURLcode -exit_zlib(z_stream *z, zlibInitState *zlib_init, CURLcode result) +exit_zlib(struct connectdata *conn, + z_stream *z, zlibInitState *zlib_init, CURLcode result) { - inflateEnd(z); - *zlib_init = ZLIB_UNINIT; + if(*zlib_init == ZLIB_GZIP_HEADER) + Curl_safefree(z->next_in); + + if(*zlib_init != ZLIB_UNINIT) { + if(inflateEnd(z) != Z_OK && result == CURLE_OK) + result = process_zlib_error(conn, z); + *zlib_init = ZLIB_UNINIT; + } + return result; } static CURLcode -inflate_stream(struct connectdata *conn, - struct SingleRequest *k) +inflate_stream(struct connectdata *conn, contenc_writer *writer) { + zlib_params *zp = (zlib_params *) &writer->params; int allow_restart = 1; - z_stream *z = &k->z; /* zlib state structure */ + z_stream *z = &zp->z; /* zlib state structure */ uInt nread = z->avail_in; Bytef *orig_in = z->next_in; int status; /* zlib status */ @@ -102,44 +146,42 @@ inflate_stream(struct connectdata *conn, large to hold on the stack */ decomp = malloc(DSIZ); if(decomp == NULL) { - return exit_zlib(z, &k->zlib_init, CURLE_OUT_OF_MEMORY); + return exit_zlib(conn, z, &zp->zlib_init, CURLE_OUT_OF_MEMORY); } /* because the buffer size is fixed, iteratively decompress and transfer to the client via client_write. */ for(;;) { + if(z->avail_in == 0) { + free(decomp); + return result; + } + /* (re)set buffer for decompressed output for every iteration */ - z->next_out = (Bytef *)decomp; + z->next_out = (Bytef *) decomp; z->avail_out = DSIZ; status = inflate(z, Z_SYNC_FLUSH); if(status == Z_OK || status == Z_STREAM_END) { allow_restart = 0; - if((DSIZ - z->avail_out) && (!k->ignorebody)) { - result = Curl_client_write(conn, CLIENTWRITE_BODY, decomp, + result = Curl_unencode_write(conn, writer->downstream, decomp, DSIZ - z->avail_out); - /* if !CURLE_OK, clean up, return */ - if(result) { - free(decomp); - return exit_zlib(z, &k->zlib_init, result); - } + /* if !CURLE_OK, clean up, return */ + if(result) { + free(decomp); + return exit_zlib(conn, z, &zp->zlib_init, result); } /* Done? clean up, return */ if(status == Z_STREAM_END) { free(decomp); - if(inflateEnd(z) == Z_OK) - return exit_zlib(z, &k->zlib_init, result); - return exit_zlib(z, &k->zlib_init, process_zlib_error(conn, z)); + return exit_zlib(conn, z, &zp->zlib_init, result); } /* Done with these bytes, exit */ /* status is always Z_OK at this point! */ - if(z->avail_in == 0) { - free(decomp); - return result; - } + continue; } else if(allow_restart && status == Z_DATA_ERROR) { /* some servers seem to not generate zlib headers, so this is an attempt @@ -148,7 +190,8 @@ inflate_stream(struct connectdata *conn, (void) inflateEnd(z); /* don't care about the return code */ if(inflateInit2(z, -MAX_WBITS) != Z_OK) { free(decomp); - return exit_zlib(z, &k->zlib_init, process_zlib_error(conn, z)); + zp->zlib_init = ZLIB_UNINIT; /* inflateEnd() already called. */ + return exit_zlib(conn, z, &zp->zlib_init, process_zlib_error(conn, z)); } z->next_in = orig_in; z->avail_in = nread; @@ -157,36 +200,97 @@ inflate_stream(struct connectdata *conn, } else { /* Error; exit loop, handle below */ free(decomp); - return exit_zlib(z, &k->zlib_init, process_zlib_error(conn, z)); + return exit_zlib(conn, z, &zp->zlib_init, process_zlib_error(conn, z)); } } - /* Will never get here */ + /* UNREACHED */ } -CURLcode -Curl_unencode_deflate_write(struct connectdata *conn, - struct SingleRequest *k, - ssize_t nread) + +/* Deflate handler. */ +static CURLcode deflate_init_writer(struct connectdata *conn, + contenc_writer *writer) { - z_stream *z = &k->z; /* zlib state structure */ + zlib_params *zp = (zlib_params *) &writer->params; + z_stream *z = &zp->z; /* zlib state structure */ - /* Initialize zlib? */ - if(k->zlib_init == ZLIB_UNINIT) { - memset(z, 0, sizeof(z_stream)); - z->zalloc = (alloc_func)zalloc_cb; - z->zfree = (free_func)zfree_cb; + if(!writer->downstream) + return CURLE_WRITE_ERROR; - if(inflateInit(z) != Z_OK) - return process_zlib_error(conn, z); - k->zlib_init = ZLIB_INIT; - } + /* Initialize zlib */ + z->zalloc = (alloc_func) zalloc_cb; + z->zfree = (free_func) zfree_cb; + + if(inflateInit(z) != Z_OK) + return process_zlib_error(conn, z); + zp->zlib_init = ZLIB_INIT; + return CURLE_OK; +} + +static CURLcode deflate_unencode_write(struct connectdata *conn, + contenc_writer *writer, + const char *buf, size_t nbytes) +{ + zlib_params *zp = (zlib_params *) &writer->params; + z_stream *z = &zp->z; /* zlib state structure */ /* Set the compressed input when this function is called */ - z->next_in = (Bytef *)k->str; - z->avail_in = (uInt)nread; + z->next_in = (Bytef *) buf; + z->avail_in = (uInt) nbytes; /* Now uncompress the data */ - return inflate_stream(conn, k); + return inflate_stream(conn, writer); +} + +static void deflate_close_writer(struct connectdata *conn, + contenc_writer *writer) +{ + zlib_params *zp = (zlib_params *) &writer->params; + z_stream *z = &zp->z; /* zlib state structure */ + + exit_zlib(conn, z, &zp->zlib_init, CURLE_OK); +} + +static const content_encoding deflate_encoding = { + "deflate", + NULL, + deflate_init_writer, + deflate_unencode_write, + deflate_close_writer, + sizeof(zlib_params) +}; + + +/* Gzip handler. */ +static CURLcode gzip_init_writer(struct connectdata *conn, + contenc_writer *writer) +{ + zlib_params *zp = (zlib_params *) &writer->params; + z_stream *z = &zp->z; /* zlib state structure */ + + if(!writer->downstream) + return CURLE_WRITE_ERROR; + + /* Initialize zlib */ + z->zalloc = (alloc_func) zalloc_cb; + z->zfree = (free_func) zfree_cb; + + if(strcmp(zlibVersion(), "1.2.0.4") >= 0) { + /* zlib ver. >= 1.2.0.4 supports transparent gzip decompressing */ + if(inflateInit2(z, MAX_WBITS + 32) != Z_OK) { + return process_zlib_error(conn, z); + } + zp->zlib_init = ZLIB_INIT_GZIP; /* Transparent gzip decompress state */ + } + else { + /* we must parse the gzip header ourselves */ + if(inflateInit2(z, -MAX_WBITS) != Z_OK) { + return process_zlib_error(conn, z); + } + zp->zlib_init = ZLIB_INIT; /* Initial call state */ + } + + return CURLE_OK; } #ifdef OLD_ZLIB_SUPPORT @@ -227,7 +331,7 @@ static enum { extra_len = (data[1] << 8) | data[0]; - if(len < (extra_len+2)) + if(len < (extra_len + 2)) return GZIP_UNDERFLOW; len -= (extra_len + 2); @@ -273,47 +377,25 @@ static enum { } #endif -CURLcode -Curl_unencode_gzip_write(struct connectdata *conn, - struct SingleRequest *k, - ssize_t nread) +static CURLcode gzip_unencode_write(struct connectdata *conn, + contenc_writer *writer, + const char *buf, size_t nbytes) { - z_stream *z = &k->z; /* zlib state structure */ - - /* Initialize zlib? */ - if(k->zlib_init == ZLIB_UNINIT) { - memset(z, 0, sizeof(z_stream)); - z->zalloc = (alloc_func)zalloc_cb; - z->zfree = (free_func)zfree_cb; - - if(strcmp(zlibVersion(), "1.2.0.4") >= 0) { - /* zlib ver. >= 1.2.0.4 supports transparent gzip decompressing */ - if(inflateInit2(z, MAX_WBITS+32) != Z_OK) { - return process_zlib_error(conn, z); - } - k->zlib_init = ZLIB_INIT_GZIP; /* Transparent gzip decompress state */ - } - else { - /* we must parse the gzip header ourselves */ - if(inflateInit2(z, -MAX_WBITS) != Z_OK) { - return process_zlib_error(conn, z); - } - k->zlib_init = ZLIB_INIT; /* Initial call state */ - } - } + zlib_params *zp = (zlib_params *) &writer->params; + z_stream *z = &zp->z; /* zlib state structure */ - if(k->zlib_init == ZLIB_INIT_GZIP) { + if(zp->zlib_init == ZLIB_INIT_GZIP) { /* Let zlib handle the gzip decompression entirely */ - z->next_in = (Bytef *)k->str; - z->avail_in = (uInt)nread; + z->next_in = (Bytef *) buf; + z->avail_in = (uInt) nbytes; /* Now uncompress the data */ - return inflate_stream(conn, k); + return inflate_stream(conn, writer); } #ifndef OLD_ZLIB_SUPPORT /* Support for old zlib versions is compiled away and we are running with an old version, so return an error. */ - return exit_zlib(z, &k->zlib_init, CURLE_WRITE_ERROR); + return exit_zlib(conn, z, &zp->zlib_init, CURLE_WRITE_ERROR); #else /* This next mess is to get around the potential case where there isn't @@ -326,18 +408,18 @@ Curl_unencode_gzip_write(struct connectdata *conn, * can handle the gzip header themselves. */ - switch(k->zlib_init) { + switch(zp->zlib_init) { /* Skip over gzip header? */ case ZLIB_INIT: { /* Initial call state */ ssize_t hlen; - switch(check_gzip_header((unsigned char *)k->str, nread, &hlen)) { + switch(check_gzip_header((unsigned char *) buf, nbytes, &hlen)) { case GZIP_OK: - z->next_in = (Bytef *)k->str + hlen; - z->avail_in = (uInt)(nread - hlen); - k->zlib_init = ZLIB_GZIP_INFLATING; /* Inflating stream state */ + z->next_in = (Bytef *) buf + hlen; + z->avail_in = (uInt) (nbytes - hlen); + zp->zlib_init = ZLIB_GZIP_INFLATING; /* Inflating stream state */ break; case GZIP_UNDERFLOW: @@ -348,19 +430,19 @@ Curl_unencode_gzip_write(struct connectdata *conn, * the first place, and it's even more unlikely for a transfer to fail * immediately afterwards, it should seldom be a problem. */ - z->avail_in = (uInt)nread; + z->avail_in = (uInt) nbytes; z->next_in = malloc(z->avail_in); if(z->next_in == NULL) { - return exit_zlib(z, &k->zlib_init, CURLE_OUT_OF_MEMORY); + return exit_zlib(conn, z, &zp->zlib_init, CURLE_OUT_OF_MEMORY); } - memcpy(z->next_in, k->str, z->avail_in); - k->zlib_init = ZLIB_GZIP_HEADER; /* Need more gzip header data state */ + memcpy(z->next_in, buf, z->avail_in); + zp->zlib_init = ZLIB_GZIP_HEADER; /* Need more gzip header data state */ /* We don't have any data to inflate yet */ return CURLE_OK; case GZIP_BAD: default: - return exit_zlib(z, &k->zlib_init, process_zlib_error(conn, z)); + return exit_zlib(conn, z, &zp->zlib_init, process_zlib_error(conn, z)); } } @@ -370,22 +452,22 @@ Curl_unencode_gzip_write(struct connectdata *conn, { /* Need more gzip header data state */ ssize_t hlen; - z->avail_in += (uInt)nread; + z->avail_in += (uInt) nbytes; z->next_in = Curl_saferealloc(z->next_in, z->avail_in); if(z->next_in == NULL) { - return exit_zlib(z, &k->zlib_init, CURLE_OUT_OF_MEMORY); + return exit_zlib(conn, z, &zp->zlib_init, CURLE_OUT_OF_MEMORY); } /* Append the new block of data to the previous one */ - memcpy(z->next_in + z->avail_in - nread, k->str, nread); + memcpy(z->next_in + z->avail_in - nbytes, buf, nbytes); switch(check_gzip_header(z->next_in, z->avail_in, &hlen)) { case GZIP_OK: /* This is the zlib stream data */ free(z->next_in); /* Don't point into the malloced block since we just freed it */ - z->next_in = (Bytef *)k->str + hlen + nread - z->avail_in; - z->avail_in = (uInt)(z->avail_in - hlen); - k->zlib_init = ZLIB_GZIP_INFLATING; /* Inflating stream state */ + z->next_in = (Bytef *) buf + hlen + nbytes - z->avail_in; + z->avail_in = (uInt) (z->avail_in - hlen); + zp->zlib_init = ZLIB_GZIP_INFLATING; /* Inflating stream state */ break; case GZIP_UNDERFLOW: @@ -394,8 +476,7 @@ Curl_unencode_gzip_write(struct connectdata *conn, case GZIP_BAD: default: - free(z->next_in); - return exit_zlib(z, &k->zlib_init, process_zlib_error(conn, z)); + return exit_zlib(conn, z, &zp->zlib_init, process_zlib_error(conn, z)); } } @@ -404,8 +485,8 @@ Curl_unencode_gzip_write(struct connectdata *conn, case ZLIB_GZIP_INFLATING: default: /* Inflating stream state */ - z->next_in = (Bytef *)k->str; - z->avail_in = (uInt)nread; + z->next_in = (Bytef *) buf; + z->avail_in = (uInt) nbytes; break; } @@ -415,17 +496,465 @@ Curl_unencode_gzip_write(struct connectdata *conn, } /* We've parsed the header, now uncompress the data */ - return inflate_stream(conn, k); + return inflate_stream(conn, writer); #endif } +static void gzip_close_writer(struct connectdata *conn, + contenc_writer *writer) +{ + zlib_params *zp = (zlib_params *) &writer->params; + z_stream *z = &zp->z; /* zlib state structure */ + + exit_zlib(conn, z, &zp->zlib_init, CURLE_OK); +} + +static const content_encoding gzip_encoding = { + "gzip", + "x-gzip", + gzip_init_writer, + gzip_unencode_write, + gzip_close_writer, + sizeof(zlib_params) +}; + +#endif /* HAVE_LIBZ */ + + +#ifdef HAVE_BROTLI + +/* Writer parameters. */ +typedef struct { + BrotliDecoderState *br; /* State structure for brotli. */ +} brotli_params; + + +static CURLcode brotli_map_error(BrotliDecoderErrorCode be) +{ + switch(be) { + case BROTLI_DECODER_ERROR_FORMAT_EXUBERANT_NIBBLE: + case BROTLI_DECODER_ERROR_FORMAT_EXUBERANT_META_NIBBLE: + case BROTLI_DECODER_ERROR_FORMAT_SIMPLE_HUFFMAN_ALPHABET: + case BROTLI_DECODER_ERROR_FORMAT_SIMPLE_HUFFMAN_SAME: + case BROTLI_DECODER_ERROR_FORMAT_CL_SPACE: + case BROTLI_DECODER_ERROR_FORMAT_HUFFMAN_SPACE: + case BROTLI_DECODER_ERROR_FORMAT_CONTEXT_MAP_REPEAT: + case BROTLI_DECODER_ERROR_FORMAT_BLOCK_LENGTH_1: + case BROTLI_DECODER_ERROR_FORMAT_BLOCK_LENGTH_2: + case BROTLI_DECODER_ERROR_FORMAT_TRANSFORM: + case BROTLI_DECODER_ERROR_FORMAT_DICTIONARY: + case BROTLI_DECODER_ERROR_FORMAT_WINDOW_BITS: + case BROTLI_DECODER_ERROR_FORMAT_PADDING_1: + case BROTLI_DECODER_ERROR_FORMAT_PADDING_2: + case BROTLI_DECODER_ERROR_COMPOUND_DICTIONARY: + case BROTLI_DECODER_ERROR_DICTIONARY_NOT_SET: + case BROTLI_DECODER_ERROR_INVALID_ARGUMENTS: + return CURLE_BAD_CONTENT_ENCODING; + case BROTLI_DECODER_ERROR_ALLOC_CONTEXT_MODES: + case BROTLI_DECODER_ERROR_ALLOC_TREE_GROUPS: + case BROTLI_DECODER_ERROR_ALLOC_CONTEXT_MAP: + case BROTLI_DECODER_ERROR_ALLOC_RING_BUFFER_1: + case BROTLI_DECODER_ERROR_ALLOC_RING_BUFFER_2: + case BROTLI_DECODER_ERROR_ALLOC_BLOCK_TYPE_TREES: + return CURLE_OUT_OF_MEMORY; + default: + break; + } + return CURLE_WRITE_ERROR; +} + +static CURLcode brotli_init_writer(struct connectdata *conn, + contenc_writer *writer) +{ + brotli_params *bp = (brotli_params *) &writer->params; + + (void) conn; + + if(!writer->downstream) + return CURLE_WRITE_ERROR; + + bp->br = BrotliDecoderCreateInstance(NULL, NULL, NULL); + return bp->br? CURLE_OK: CURLE_OUT_OF_MEMORY; +} + +static CURLcode brotli_unencode_write(struct connectdata *conn, + contenc_writer *writer, + const char *buf, size_t nbytes) +{ + brotli_params *bp = (brotli_params *) &writer->params; + const uint8_t *src = (const uint8_t *) buf; + char *decomp; + uint8_t *dst; + size_t dstleft; + CURLcode result = CURLE_OK; + + if(!bp->br) + return CURLE_WRITE_ERROR; /* Stream already ended. */ + + decomp = malloc(DSIZ); + if(!decomp) + return CURLE_OUT_OF_MEMORY; + + while(nbytes && result == CURLE_OK) { + BrotliDecoderResult r; + + dst = (uint8_t *) decomp; + dstleft = DSIZ; + r = BrotliDecoderDecompressStream(bp->br, + &nbytes, &src, &dstleft, &dst, NULL); + result = Curl_unencode_write(conn, writer->downstream, + decomp, DSIZ - dstleft); + if(result) + break; + switch(r) { + case BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT: + case BROTLI_DECODER_RESULT_NEEDS_MORE_INPUT: + break; + case BROTLI_DECODER_RESULT_SUCCESS: + BrotliDecoderDestroyInstance(bp->br); + bp->br = NULL; + if(nbytes) + result = CURLE_WRITE_ERROR; + break; + default: + result = brotli_map_error(BrotliDecoderGetErrorCode(bp->br)); + break; + } + } + free(decomp); + return result; +} + +static void brotli_close_writer(struct connectdata *conn, + contenc_writer *writer) +{ + brotli_params *bp = (brotli_params *) &writer->params; + + (void) conn; + + if(bp->br) { + BrotliDecoderDestroyInstance(bp->br); + bp->br = NULL; + } +} + +static const content_encoding brotli_encoding = { + "br", + NULL, + brotli_init_writer, + brotli_unencode_write, + brotli_close_writer, + sizeof(brotli_params) +}; +#endif + + +/* Identity handler. */ +static CURLcode identity_init_writer(struct connectdata *conn, + contenc_writer *writer) +{ + (void) conn; + return writer->downstream? CURLE_OK: CURLE_WRITE_ERROR; +} + +static CURLcode identity_unencode_write(struct connectdata *conn, + contenc_writer *writer, + const char *buf, size_t nbytes) +{ + return Curl_unencode_write(conn, writer->downstream, buf, nbytes); +} + +static void identity_close_writer(struct connectdata *conn, + contenc_writer *writer) +{ + (void) conn; + (void) writer; +} + +static const content_encoding identity_encoding = { + "identity", + NULL, + identity_init_writer, + identity_unencode_write, + identity_close_writer, + 0 +}; + + +/* supported content encodings table. */ +static const content_encoding * const encodings[] = { + &identity_encoding, +#ifdef HAVE_LIBZ + &deflate_encoding, + &gzip_encoding, +#endif +#ifdef HAVE_BROTLI + &brotli_encoding, +#endif + NULL +}; + + +/* Return a list of comma-separated names of supported encodings. */ +char *Curl_all_content_encodings(void) +{ + size_t len = 0; + const content_encoding * const *cep; + const content_encoding *ce; + char *ace; + char *p; + + for(cep = encodings; *cep; cep++) { + ce = *cep; + if(!strcasecompare(ce->name, CONTENT_ENCODING_DEFAULT)) + len += strlen(ce->name) + 2; + } + + if(!len) + return strdup(CONTENT_ENCODING_DEFAULT); + + ace = malloc(len); + if(ace) { + p = ace; + for(cep = encodings; *cep; cep++) { + ce = *cep; + if(!strcasecompare(ce->name, CONTENT_ENCODING_DEFAULT)) { + strcpy(p, ce->name); + p += strlen(p); + *p++ = ','; + *p++ = ' '; + } + } + p[-2] = '\0'; + } + + return ace; +} + + +/* Real client writer: no downstream. */ +static CURLcode client_init_writer(struct connectdata *conn, + contenc_writer *writer) +{ + (void) conn; + return writer->downstream? CURLE_WRITE_ERROR: CURLE_OK; +} + +static CURLcode client_unencode_write(struct connectdata *conn, + contenc_writer *writer, + const char *buf, size_t nbytes) +{ + struct Curl_easy *data = conn->data; + struct SingleRequest *k = &data->req; + + (void) writer; + + if(!nbytes || k->ignorebody) + return CURLE_OK; + + return Curl_client_write(conn, CLIENTWRITE_BODY, (char *) buf, nbytes); +} + +static void client_close_writer(struct connectdata *conn, + contenc_writer *writer) +{ + (void) conn; + (void) writer; +} + +static const content_encoding client_encoding = { + NULL, + NULL, + client_init_writer, + client_unencode_write, + client_close_writer, + 0 +}; + + +/* Deferred error dummy writer. */ +static CURLcode error_init_writer(struct connectdata *conn, + contenc_writer *writer) +{ + (void) conn; + return writer->downstream? CURLE_OK: CURLE_WRITE_ERROR; +} + +static CURLcode error_unencode_write(struct connectdata *conn, + contenc_writer *writer, + const char *buf, size_t nbytes) +{ + char *all = Curl_all_content_encodings(); + + (void) writer; + (void) buf; + (void) nbytes; + + if(!all) + return CURLE_OUT_OF_MEMORY; + failf(conn->data, "Unrecognized content encoding type. " + "libcurl understands %s content encodings.", all); + free(all); + return CURLE_BAD_CONTENT_ENCODING; +} + +static void error_close_writer(struct connectdata *conn, + contenc_writer *writer) +{ + (void) conn; + (void) writer; +} + +static const content_encoding error_encoding = { + NULL, + NULL, + error_init_writer, + error_unencode_write, + error_close_writer, + 0 +}; + +/* Create an unencoding writer stage using the given handler. */ +static contenc_writer *new_unencoding_writer(struct connectdata *conn, + const content_encoding *handler, + contenc_writer *downstream) +{ + size_t sz = offsetof(contenc_writer, params) + handler->paramsize; + contenc_writer *writer = (contenc_writer *) malloc(sz); + + if(writer) { + memset(writer, 0, sz); + writer->handler = handler; + writer->downstream = downstream; + if(handler->init_writer(conn, writer)) { + free(writer); + writer = NULL; + } + } + + return writer; +} + +/* Write data using an unencoding writer stack. */ +CURLcode Curl_unencode_write(struct connectdata *conn, contenc_writer *writer, + const char *buf, size_t nbytes) +{ + if(!nbytes) + return CURLE_OK; + return writer->handler->unencode_write(conn, writer, buf, nbytes); +} + +/* Close and clean-up the connection's writer stack. */ void Curl_unencode_cleanup(struct connectdata *conn) { struct Curl_easy *data = conn->data; struct SingleRequest *k = &data->req; - z_stream *z = &k->z; - if(k->zlib_init != ZLIB_UNINIT) - (void) exit_zlib(z, &k->zlib_init, CURLE_OK); + contenc_writer *writer = k->writer_stack; + + while(writer) { + k->writer_stack = writer->downstream; + writer->handler->close_writer(conn, writer); + free(writer); + writer = k->writer_stack; + } } -#endif /* HAVE_LIBZ */ +/* Find the content encoding by name. */ +static const content_encoding *find_encoding(const char *name, size_t len) +{ + const content_encoding * const *cep; + const content_encoding *ce; + + for(cep = encodings; *cep; cep++) { + ce = *cep; + if((strncasecompare(name, ce->name, len) && !ce->name[len]) || + (ce->alias && strncasecompare(name, ce->alias, len) && !ce->alias[len])) + return ce; + } + return NULL; +} + +/* Set-up the unencoding stack from the Content-Encoding header value. + * See RFC 7231 section 3.1.2.2. */ +CURLcode Curl_build_unencoding_stack(struct connectdata *conn, + const char *enclist, int maybechunked) +{ + struct Curl_easy *data = conn->data; + struct SingleRequest *k = &data->req; + + do { + const char *name; + size_t namelen; + + /* Parse a single encoding name. */ + while(ISSPACE(*enclist) || *enclist == ',') + enclist++; + + name = enclist; + + for(namelen = 0; *enclist && *enclist != ','; enclist++) + if(!ISSPACE(*enclist)) + namelen = enclist - name + 1; + + /* Special case: chunked encoding is handled at the reader level. */ + if(maybechunked && namelen == 7 && strncasecompare(name, "chunked", 7)) { + k->chunk = TRUE; /* chunks coming our way. */ + Curl_httpchunk_init(conn); /* init our chunky engine. */ + } + else if(namelen) { + const content_encoding *encoding = find_encoding(name, namelen); + contenc_writer *writer; + + if(!k->writer_stack) { + k->writer_stack = new_unencoding_writer(conn, &client_encoding, NULL); + + if(!k->writer_stack) + return CURLE_OUT_OF_MEMORY; + } + + if(!encoding) + encoding = &error_encoding; /* Defer error at stack use. */ + + /* Stack the unencoding stage. */ + writer = new_unencoding_writer(conn, encoding, k->writer_stack); + if(!writer) + return CURLE_OUT_OF_MEMORY; + k->writer_stack = writer; + } + } while(*enclist); + + return CURLE_OK; +} + +#else +/* Stubs for builds without HTTP. */ +CURLcode Curl_build_unencoding_stack(struct connectdata *conn, + const char *enclist, int maybechunked) +{ + (void) conn; + (void) enclist; + (void) maybechunked; + return CURLE_NOT_BUILT_IN; +} + +CURLcode Curl_unencode_write(struct connectdata *conn, contenc_writer *writer, + const char *buf, size_t nbytes) +{ + (void) conn; + (void) writer; + (void) buf; + (void) nbytes; + return CURLE_NOT_BUILT_IN; +} + +void Curl_unencode_cleanup(struct connectdata *conn) +{ + (void) conn; +} + +char *Curl_all_content_encodings(void) +{ + return strdup(CONTENT_ENCODING_DEFAULT); /* Satisfy caller. */ +} + +#endif /* CURL_DISABLE_HTTP */ |