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Unified Diff: third_party/libxml/src/xzlib.c

Issue 2804483002: Check in the libxml roll script. (Closed)
Patch Set: Code review feedback for the roll script. Created 3 years, 8 months ago
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Index: third_party/libxml/src/xzlib.c
diff --git a/third_party/libxml/src/xzlib.c b/third_party/libxml/src/xzlib.c
deleted file mode 100644
index 782957f65256ebf1b5219feb5c6d0e1923a250c4..0000000000000000000000000000000000000000
--- a/third_party/libxml/src/xzlib.c
+++ /dev/null
@@ -1,804 +0,0 @@
-/**
- * xzlib.c: front end for the transparent suport of lzma compression
- * at the I/O layer, based on an example file from lzma project
- *
- * See Copyright for the status of this software.
- *
- * Anders F Bjorklund <afb@users.sourceforge.net>
- */
-#define IN_LIBXML
-#include "libxml.h"
-#ifdef LIBXML_LZMA_ENABLED
-
-#include <string.h>
-#ifdef HAVE_ERRNO_H
-#include <errno.h>
-#endif
-
-
-#ifdef HAVE_SYS_TYPES_H
-#include <sys/types.h>
-#endif
-#ifdef HAVE_SYS_STAT_H
-#include <sys/stat.h>
-#endif
-#ifdef HAVE_FCNTL_H
-#include <fcntl.h>
-#endif
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-#ifdef HAVE_STDLIB_H
-#include <stdlib.h>
-#endif
-#ifdef HAVE_ZLIB_H
-#include <zlib.h>
-#endif
-#ifdef HAVE_LZMA_H
-#include <lzma.h>
-#endif
-
-#include "xzlib.h"
-#include <libxml/xmlmemory.h>
-
-/* values for xz_state how */
-#define LOOK 0 /* look for a gzip/lzma header */
-#define COPY 1 /* copy input directly */
-#define GZIP 2 /* decompress a gzip stream */
-#define LZMA 3 /* decompress a lzma stream */
-
-/* internal lzma file state data structure */
-typedef struct {
- int mode; /* see lzma modes above */
- int fd; /* file descriptor */
- char *path; /* path or fd for error messages */
- uint64_t pos; /* current position in uncompressed data */
- unsigned int size; /* buffer size, zero if not allocated yet */
- unsigned int want; /* requested buffer size, default is BUFSIZ */
- unsigned char *in; /* input buffer */
- unsigned char *out; /* output buffer (double-sized when reading) */
- unsigned char *next; /* next output data to deliver or write */
- unsigned int have; /* amount of output data unused at next */
- int eof; /* true if end of input file reached */
- uint64_t start; /* where the lzma data started, for rewinding */
- uint64_t raw; /* where the raw data started, for seeking */
- int how; /* 0: get header, 1: copy, 2: decompress */
- int direct; /* true if last read direct, false if lzma */
- /* seek request */
- uint64_t skip; /* amount to skip (already rewound if backwards) */
- int seek; /* true if seek request pending */
- /* error information */
- int err; /* error code */
- char *msg; /* error message */
- /* lzma stream */
- int init; /* is the iniflate stream initialized */
- lzma_stream strm; /* stream structure in-place (not a pointer) */
- char padding1[32]; /* padding allowing to cope with possible
- extensions of above structure without
- too much side effect */
-#ifdef HAVE_ZLIB_H
- /* zlib inflate or deflate stream */
- z_stream zstrm; /* stream structure in-place (not a pointer) */
-#endif
- char padding2[32]; /* padding allowing to cope with possible
- extensions of above structure without
- too much side effect */
-} xz_state, *xz_statep;
-
-static void
-xz_error(xz_statep state, int err, const char *msg)
-{
- /* free previously allocated message and clear */
- if (state->msg != NULL) {
- if (state->err != LZMA_MEM_ERROR)
- xmlFree(state->msg);
- state->msg = NULL;
- }
-
- /* set error code, and if no message, then done */
- state->err = err;
- if (msg == NULL)
- return;
-
- /* for an out of memory error, save as static string */
- if (err == LZMA_MEM_ERROR) {
- state->msg = (char *) msg;
- return;
- }
-
- /* construct error message with path */
- if ((state->msg =
- xmlMalloc(strlen(state->path) + strlen(msg) + 3)) == NULL) {
- state->err = LZMA_MEM_ERROR;
- state->msg = (char *) "out of memory";
- return;
- }
- strcpy(state->msg, state->path);
- strcat(state->msg, ": ");
- strcat(state->msg, msg);
- return;
-}
-
-static void
-xz_reset(xz_statep state)
-{
- state->have = 0; /* no output data available */
- state->eof = 0; /* not at end of file */
- state->how = LOOK; /* look for gzip header */
- state->direct = 1; /* default for empty file */
- state->seek = 0; /* no seek request pending */
- xz_error(state, LZMA_OK, NULL); /* clear error */
- state->pos = 0; /* no uncompressed data yet */
- state->strm.avail_in = 0; /* no input data yet */
-#ifdef HAVE_ZLIB_H
- state->zstrm.avail_in = 0; /* no input data yet */
-#endif
-}
-
-static xzFile
-xz_open(const char *path, int fd, const char *mode ATTRIBUTE_UNUSED)
-{
- xz_statep state;
-
- /* allocate xzFile structure to return */
- state = xmlMalloc(sizeof(xz_state));
- if (state == NULL)
- return NULL;
- state->size = 0; /* no buffers allocated yet */
- state->want = BUFSIZ; /* requested buffer size */
- state->msg = NULL; /* no error message yet */
- state->init = 0; /* initialization of zlib data */
-
- /* save the path name for error messages */
- state->path = xmlMalloc(strlen(path) + 1);
- if (state->path == NULL) {
- xmlFree(state);
- return NULL;
- }
- strcpy(state->path, path);
-
- /* open the file with the appropriate mode (or just use fd) */
- state->fd = fd != -1 ? fd : open(path,
-#ifdef O_LARGEFILE
- O_LARGEFILE |
-#endif
-#ifdef O_BINARY
- O_BINARY |
-#endif
- O_RDONLY, 0666);
- if (state->fd == -1) {
- xmlFree(state->path);
- xmlFree(state);
- return NULL;
- }
-
- /* save the current position for rewinding (only if reading) */
- state->start = lseek(state->fd, 0, SEEK_CUR);
- if (state->start == (uint64_t) - 1)
- state->start = 0;
-
- /* initialize stream */
- xz_reset(state);
-
- /* return stream */
- return (xzFile) state;
-}
-
-static int
-xz_compressed(xzFile f) {
- xz_statep state;
-
- if (f == NULL)
- return(-1);
- state = (xz_statep) f;
- if (state->init <= 0)
- return(-1);
-
- switch (state->how) {
- case COPY:
- return(0);
- case GZIP:
- case LZMA:
- return(1);
- }
- return(-1);
-}
-
-xzFile
-__libxml2_xzopen(const char *path, const char *mode)
-{
- return xz_open(path, -1, mode);
-}
-
-int
-__libxml2_xzcompressed(xzFile f) {
- return xz_compressed(f);
-}
-
-xzFile
-__libxml2_xzdopen(int fd, const char *mode)
-{
- char *path; /* identifier for error messages */
- xzFile xz;
-
- if (fd == -1 || (path = xmlMalloc(7 + 3 * sizeof(int))) == NULL)
- return NULL;
- sprintf(path, "<fd:%d>", fd); /* for debugging */
- xz = xz_open(path, fd, mode);
- xmlFree(path);
- return xz;
-}
-
-static int
-xz_load(xz_statep state, unsigned char *buf, unsigned int len,
- unsigned int *have)
-{
- int ret;
-
- *have = 0;
- do {
- ret = read(state->fd, buf + *have, len - *have);
- if (ret <= 0)
- break;
- *have += ret;
- } while (*have < len);
- if (ret < 0) {
- xz_error(state, -1, strerror(errno));
- return -1;
- }
- if (ret == 0)
- state->eof = 1;
- return 0;
-}
-
-static int
-xz_avail(xz_statep state)
-{
- lzma_stream *strm = &(state->strm);
-
- if (state->err != LZMA_OK)
- return -1;
- if (state->eof == 0) {
- /* avail_in is size_t, which is not necessary sizeof(unsigned) */
- unsigned tmp = strm->avail_in;
-
- if (xz_load(state, state->in, state->size, &tmp) == -1) {
- strm->avail_in = tmp;
- return -1;
- }
- strm->avail_in = tmp;
- strm->next_in = state->in;
- }
- return 0;
-}
-
-#ifdef HAVE_ZLIB_H
-static int
-xz_avail_zstrm(xz_statep state)
-{
- int ret;
- state->strm.avail_in = state->zstrm.avail_in;
- state->strm.next_in = state->zstrm.next_in;
- ret = xz_avail(state);
- state->zstrm.avail_in = (uInt) state->strm.avail_in;
- state->zstrm.next_in = (Bytef *) state->strm.next_in;
- return ret;
-}
-#endif
-
-static int
-is_format_xz(xz_statep state)
-{
- lzma_stream *strm = &(state->strm);
-
- return strm->avail_in >= 6 && memcmp(state->in, "\3757zXZ", 6) == 0;
-}
-
-static int
-is_format_lzma(xz_statep state)
-{
- lzma_stream *strm = &(state->strm);
-
- lzma_filter filter;
- lzma_options_lzma *opt;
- uint32_t dict_size;
- uint64_t uncompressed_size;
- size_t i;
-
- if (strm->avail_in < 13)
- return 0;
-
- filter.id = LZMA_FILTER_LZMA1;
- if (lzma_properties_decode(&filter, NULL, state->in, 5) != LZMA_OK)
- return 0;
-
- opt = filter.options;
- dict_size = opt->dict_size;
- free(opt); /* we can't use xmlFree on a string returned by zlib */
-
- /* A hack to ditch tons of false positives: We allow only dictionary
- * sizes that are 2^n or 2^n + 2^(n-1) or UINT32_MAX. LZMA_Alone
- * created only files with 2^n, but accepts any dictionary size.
- * If someone complains, this will be reconsidered.
- */
- if (dict_size != UINT32_MAX) {
- uint32_t d = dict_size - 1;
-
- d |= d >> 2;
- d |= d >> 3;
- d |= d >> 4;
- d |= d >> 8;
- d |= d >> 16;
- ++d;
- if (d != dict_size || dict_size == 0)
- return 0;
- }
-
- /* Another hack to ditch false positives: Assume that if the
- * uncompressed size is known, it must be less than 256 GiB.
- * Again, if someone complains, this will be reconsidered.
- */
- uncompressed_size = 0;
- for (i = 0; i < 8; ++i)
- uncompressed_size |= (uint64_t) (state->in[5 + i]) << (i * 8);
-
- if (uncompressed_size != UINT64_MAX
- && uncompressed_size > (UINT64_C(1) << 38))
- return 0;
-
- return 1;
-}
-
-#ifdef HAVE_ZLIB_H
-
-/* Get next byte from input, or -1 if end or error. */
-#define NEXT() ((strm->avail_in == 0 && xz_avail(state) == -1) ? -1 : \
- (strm->avail_in == 0 ? -1 : \
- (strm->avail_in--, *(strm->next_in)++)))
-/* Same thing, but from zstrm */
-#define NEXTZ() ((strm->avail_in == 0 && xz_avail_zstrm(state) == -1) ? -1 : \
- (strm->avail_in == 0 ? -1 : \
- (strm->avail_in--, *(strm->next_in)++)))
-
-/* Get a four-byte little-endian integer and return 0 on success and the value
- in *ret. Otherwise -1 is returned and *ret is not modified. */
-static int
-gz_next4(xz_statep state, unsigned long *ret)
-{
- int ch;
- unsigned long val;
- z_streamp strm = &(state->zstrm);
-
- val = NEXTZ();
- val += (unsigned) NEXTZ() << 8;
- val += (unsigned long) NEXTZ() << 16;
- ch = NEXTZ();
- if (ch == -1)
- return -1;
- val += (unsigned long) ch << 24;
- *ret = val;
- return 0;
-}
-#endif
-
-static int
-xz_head(xz_statep state)
-{
- lzma_stream *strm = &(state->strm);
- lzma_stream init = LZMA_STREAM_INIT;
- int flags;
- unsigned len;
-
- /* allocate read buffers and inflate memory */
- if (state->size == 0) {
- /* allocate buffers */
- state->in = xmlMalloc(state->want);
- state->out = xmlMalloc(state->want << 1);
- if (state->in == NULL || state->out == NULL) {
- if (state->out != NULL)
- xmlFree(state->out);
- if (state->in != NULL)
- xmlFree(state->in);
- xz_error(state, LZMA_MEM_ERROR, "out of memory");
- return -1;
- }
- state->size = state->want;
-
- /* allocate decoder memory */
- state->strm = init;
- state->strm.avail_in = 0;
- state->strm.next_in = NULL;
- if (lzma_auto_decoder(&state->strm, UINT64_MAX, 0) != LZMA_OK) {
- xmlFree(state->out);
- xmlFree(state->in);
- state->size = 0;
- xz_error(state, LZMA_MEM_ERROR, "out of memory");
- return -1;
- }
-#ifdef HAVE_ZLIB_H
- /* allocate inflate memory */
- state->zstrm.zalloc = Z_NULL;
- state->zstrm.zfree = Z_NULL;
- state->zstrm.opaque = Z_NULL;
- state->zstrm.avail_in = 0;
- state->zstrm.next_in = Z_NULL;
- if (state->init == 0) {
- if (inflateInit2(&(state->zstrm), -15) != Z_OK) {/* raw inflate */
- xmlFree(state->out);
- xmlFree(state->in);
- state->size = 0;
- xz_error(state, LZMA_MEM_ERROR, "out of memory");
- return -1;
- }
- state->init = 1;
- }
-#endif
- }
-
- /* get some data in the input buffer */
- if (strm->avail_in == 0) {
- if (xz_avail(state) == -1)
- return -1;
- if (strm->avail_in == 0)
- return 0;
- }
-
- /* look for the xz magic header bytes */
- if (is_format_xz(state) || is_format_lzma(state)) {
- state->how = LZMA;
- state->direct = 0;
- return 0;
- }
-#ifdef HAVE_ZLIB_H
- /* look for the gzip magic header bytes 31 and 139 */
- if (strm->next_in[0] == 31) {
- strm->avail_in--;
- strm->next_in++;
- if (strm->avail_in == 0 && xz_avail(state) == -1)
- return -1;
- if (strm->avail_in && strm->next_in[0] == 139) {
- /* we have a gzip header, woo hoo! */
- strm->avail_in--;
- strm->next_in++;
-
- /* skip rest of header */
- if (NEXT() != 8) { /* compression method */
- xz_error(state, LZMA_DATA_ERROR,
- "unknown compression method");
- return -1;
- }
- flags = NEXT();
- if (flags & 0xe0) { /* reserved flag bits */
- xz_error(state, LZMA_DATA_ERROR,
- "unknown header flags set");
- return -1;
- }
- NEXT(); /* modification time */
- NEXT();
- NEXT();
- NEXT();
- NEXT(); /* extra flags */
- NEXT(); /* operating system */
- if (flags & 4) { /* extra field */
- len = (unsigned) NEXT();
- len += (unsigned) NEXT() << 8;
- while (len--)
- if (NEXT() < 0)
- break;
- }
- if (flags & 8) /* file name */
- while (NEXT() > 0) ;
- if (flags & 16) /* comment */
- while (NEXT() > 0) ;
- if (flags & 2) { /* header crc */
- NEXT();
- NEXT();
- }
- /* an unexpected end of file is not checked for here -- it will be
- * noticed on the first request for uncompressed data */
-
- /* set up for decompression */
- inflateReset(&state->zstrm);
- state->zstrm.adler = crc32(0L, Z_NULL, 0);
- state->how = GZIP;
- state->direct = 0;
- return 0;
- } else {
- /* not a gzip file -- save first byte (31) and fall to raw i/o */
- state->out[0] = 31;
- state->have = 1;
- }
- }
-#endif
-
- /* doing raw i/o, save start of raw data for seeking, copy any leftover
- * input to output -- this assumes that the output buffer is larger than
- * the input buffer, which also assures space for gzungetc() */
- state->raw = state->pos;
- state->next = state->out;
- if (strm->avail_in) {
- memcpy(state->next + state->have, strm->next_in, strm->avail_in);
- state->have += strm->avail_in;
- strm->avail_in = 0;
- }
- state->how = COPY;
- state->direct = 1;
- return 0;
-}
-
-static int
-xz_decomp(xz_statep state)
-{
- int ret;
- unsigned had;
- unsigned long crc, len;
- lzma_stream *strm = &(state->strm);
-
- lzma_action action = LZMA_RUN;
-
- /* fill output buffer up to end of deflate stream */
- had = strm->avail_out;
- do {
- /* get more input for inflate() */
- if (strm->avail_in == 0 && xz_avail(state) == -1)
- return -1;
- if (strm->avail_in == 0) {
- xz_error(state, LZMA_DATA_ERROR, "unexpected end of file");
- return -1;
- }
- if (state->eof)
- action = LZMA_FINISH;
-
- /* decompress and handle errors */
-#ifdef HAVE_ZLIB_H
- if (state->how == GZIP) {
- state->zstrm.avail_in = (uInt) state->strm.avail_in;
- state->zstrm.next_in = (Bytef *) state->strm.next_in;
- state->zstrm.avail_out = (uInt) state->strm.avail_out;
- state->zstrm.next_out = (Bytef *) state->strm.next_out;
- ret = inflate(&state->zstrm, Z_NO_FLUSH);
- if (ret == Z_STREAM_ERROR || ret == Z_NEED_DICT) {
- xz_error(state, Z_STREAM_ERROR,
- "internal error: inflate stream corrupt");
- return -1;
- }
- if (ret == Z_MEM_ERROR)
- ret = LZMA_MEM_ERROR;
- if (ret == Z_DATA_ERROR)
- ret = LZMA_DATA_ERROR;
- if (ret == Z_STREAM_END)
- ret = LZMA_STREAM_END;
- state->strm.avail_in = state->zstrm.avail_in;
- state->strm.next_in = state->zstrm.next_in;
- state->strm.avail_out = state->zstrm.avail_out;
- state->strm.next_out = state->zstrm.next_out;
- } else /* state->how == LZMA */
-#endif
- ret = lzma_code(strm, action);
- if (ret == LZMA_MEM_ERROR) {
- xz_error(state, LZMA_MEM_ERROR, "out of memory");
- return -1;
- }
- if (ret == LZMA_DATA_ERROR) {
- xz_error(state, LZMA_DATA_ERROR, "compressed data error");
- return -1;
- }
- if (ret == LZMA_PROG_ERROR) {
- xz_error(state, LZMA_PROG_ERROR, "compression error");
- return -1;
- }
- } while (strm->avail_out && ret != LZMA_STREAM_END);
-
- /* update available output and crc check value */
- state->have = had - strm->avail_out;
- state->next = strm->next_out - state->have;
-#ifdef HAVE_ZLIB_H
- state->zstrm.adler =
- crc32(state->zstrm.adler, state->next, state->have);
-#endif
-
- if (ret == LZMA_STREAM_END) {
-#ifdef HAVE_ZLIB_H
- if (state->how == GZIP) {
- if (gz_next4(state, &crc) == -1 || gz_next4(state, &len) == -1) {
- xz_error(state, LZMA_DATA_ERROR, "unexpected end of file");
- return -1;
- }
- if (crc != state->zstrm.adler) {
- xz_error(state, LZMA_DATA_ERROR, "incorrect data check");
- return -1;
- }
- if (len != (state->zstrm.total_out & 0xffffffffL)) {
- xz_error(state, LZMA_DATA_ERROR, "incorrect length check");
- return -1;
- }
- state->strm.avail_in = 0;
- state->strm.next_in = NULL;
- state->strm.avail_out = 0;
- state->strm.next_out = NULL;
- } else
-#endif
- if (strm->avail_in != 0 || !state->eof) {
- xz_error(state, LZMA_DATA_ERROR, "trailing garbage");
- return -1;
- }
- state->how = LOOK; /* ready for next stream, once have is 0 (leave
- * state->direct unchanged to remember how) */
- }
-
- /* good decompression */
- return 0;
-}
-
-static int
-xz_make(xz_statep state)
-{
- lzma_stream *strm = &(state->strm);
-
- if (state->how == LOOK) { /* look for lzma / gzip header */
- if (xz_head(state) == -1)
- return -1;
- if (state->have) /* got some data from xz_head() */
- return 0;
- }
- if (state->how == COPY) { /* straight copy */
- if (xz_load(state, state->out, state->size << 1, &(state->have)) ==
- -1)
- return -1;
- state->next = state->out;
- } else if (state->how == LZMA || state->how == GZIP) { /* decompress */
- strm->avail_out = state->size << 1;
- strm->next_out = state->out;
- if (xz_decomp(state) == -1)
- return -1;
- }
- return 0;
-}
-
-static int
-xz_skip(xz_statep state, uint64_t len)
-{
- unsigned n;
-
- /* skip over len bytes or reach end-of-file, whichever comes first */
- while (len)
- /* skip over whatever is in output buffer */
- if (state->have) {
- n = (uint64_t) state->have > len ?
- (unsigned) len : state->have;
- state->have -= n;
- state->next += n;
- state->pos += n;
- len -= n;
- }
-
- /* output buffer empty -- return if we're at the end of the input */
- else if (state->eof && state->strm.avail_in == 0)
- break;
-
- /* need more data to skip -- load up output buffer */
- else {
- /* get more output, looking for header if required */
- if (xz_make(state) == -1)
- return -1;
- }
- return 0;
-}
-
-int
-__libxml2_xzread(xzFile file, void *buf, unsigned len)
-{
- unsigned got, n;
- xz_statep state;
- lzma_stream *strm;
-
- /* get internal structure */
- if (file == NULL)
- return -1;
- state = (xz_statep) file;
- strm = &(state->strm);
-
- /* check that we're reading and that there's no error */
- if (state->err != LZMA_OK)
- return -1;
-
- /* since an int is returned, make sure len fits in one, otherwise return
- * with an error (this avoids the flaw in the interface) */
- if ((int) len < 0) {
- xz_error(state, LZMA_BUF_ERROR,
- "requested length does not fit in int");
- return -1;
- }
-
- /* if len is zero, avoid unnecessary operations */
- if (len == 0)
- return 0;
-
- /* process a skip request */
- if (state->seek) {
- state->seek = 0;
- if (xz_skip(state, state->skip) == -1)
- return -1;
- }
-
- /* get len bytes to buf, or less than len if at the end */
- got = 0;
- do {
- /* first just try copying data from the output buffer */
- if (state->have) {
- n = state->have > len ? len : state->have;
- memcpy(buf, state->next, n);
- state->next += n;
- state->have -= n;
- }
-
- /* output buffer empty -- return if we're at the end of the input */
- else if (state->eof && strm->avail_in == 0)
- break;
-
- /* need output data -- for small len or new stream load up our output
- * buffer */
- else if (state->how == LOOK || len < (state->size << 1)) {
- /* get more output, looking for header if required */
- if (xz_make(state) == -1)
- return -1;
- continue; /* no progress yet -- go back to memcpy() above */
- /* the copy above assures that we will leave with space in the
- * output buffer, allowing at least one gzungetc() to succeed */
- }
-
- /* large len -- read directly into user buffer */
- else if (state->how == COPY) { /* read directly */
- if (xz_load(state, buf, len, &n) == -1)
- return -1;
- }
-
- /* large len -- decompress directly into user buffer */
- else { /* state->how == LZMA */
- strm->avail_out = len;
- strm->next_out = buf;
- if (xz_decomp(state) == -1)
- return -1;
- n = state->have;
- state->have = 0;
- }
-
- /* update progress */
- len -= n;
- buf = (char *) buf + n;
- got += n;
- state->pos += n;
- } while (len);
-
- /* return number of bytes read into user buffer (will fit in int) */
- return (int) got;
-}
-
-int
-__libxml2_xzclose(xzFile file)
-{
- int ret;
- xz_statep state;
-
- /* get internal structure */
- if (file == NULL)
- return LZMA_DATA_ERROR;
- state = (xz_statep) file;
-
- /* free memory and close file */
- if (state->size) {
- lzma_end(&(state->strm));
-#ifdef HAVE_ZLIB_H
- if (state->init == 1)
- inflateEnd(&(state->zstrm));
- state->init = 0;
-#endif
- xmlFree(state->out);
- xmlFree(state->in);
- }
- xmlFree(state->path);
- ret = close(state->fd);
- xmlFree(state);
- return ret ? ret : LZMA_OK;
-}
-#endif /* LIBXML_LZMA_ENABLED */
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