diff options
Diffstat (limited to '3rdparty/zlib/gzread.c')
-rw-r--r-- | 3rdparty/zlib/gzread.c | 108 |
1 files changed, 28 insertions, 80 deletions
diff --git a/3rdparty/zlib/gzread.c b/3rdparty/zlib/gzread.c index 956b91ea7d9..4168cbc8875 100644 --- a/3rdparty/zlib/gzread.c +++ b/3rdparty/zlib/gzread.c @@ -1,29 +1,16 @@ /* gzread.c -- zlib functions for reading gzip files - * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 Mark Adler + * Copyright (C) 2004-2017 Mark Adler * For conditions of distribution and use, see copyright notice in zlib.h */ #include "gzguts.h" -/* Local functions */ -local int gz_load OF((gz_statep, unsigned char *, unsigned, unsigned *)); -local int gz_avail OF((gz_statep)); -local int gz_look OF((gz_statep)); -local int gz_decomp OF((gz_statep)); -local int gz_fetch OF((gz_statep)); -local int gz_skip OF((gz_statep, z_off64_t)); -local z_size_t gz_read OF((gz_statep, voidp, z_size_t)); - /* Use read() to load a buffer -- return -1 on error, otherwise 0. Read from state->fd, and update state->eof, state->err, and state->msg as appropriate. This function needs to loop on read(), since read() is not guaranteed to read the number of bytes requested, depending on the type of descriptor. */ -local int gz_load(state, buf, len, have) - gz_statep state; - unsigned char *buf; - unsigned len; - unsigned *have; -{ +local int gz_load(gz_statep state, unsigned char *buf, unsigned len, + unsigned *have) { int ret; unsigned get, max = ((unsigned)-1 >> 2) + 1; @@ -53,9 +40,7 @@ local int gz_load(state, buf, len, have) If strm->avail_in != 0, then the current data is moved to the beginning of the input buffer, and then the remainder of the buffer is loaded with the available data from the input file. */ -local int gz_avail(state) - gz_statep state; -{ +local int gz_avail(gz_statep state) { unsigned got; z_streamp strm = &(state->strm); @@ -88,9 +73,7 @@ local int gz_avail(state) case, all further file reads will be directly to either the output buffer or a user buffer. If decompressing, the inflate state will be initialized. gz_look() will return 0 on success or -1 on failure. */ -local int gz_look(state) - gz_statep state; -{ +local int gz_look(gz_statep state) { z_streamp strm = &(state->strm); /* allocate read buffers and inflate memory */ @@ -157,11 +140,9 @@ local int gz_look(state) the output buffer is larger than the input buffer, which also assures space for gzungetc() */ state->x.next = state->out; - if (strm->avail_in) { - memcpy(state->x.next, strm->next_in, strm->avail_in); - state->x.have = strm->avail_in; - strm->avail_in = 0; - } + memcpy(state->x.next, strm->next_in, strm->avail_in); + state->x.have = strm->avail_in; + strm->avail_in = 0; state->how = COPY; state->direct = 1; return 0; @@ -172,9 +153,7 @@ local int gz_look(state) data. If the gzip stream completes, state->how is reset to LOOK to look for the next gzip stream or raw data, once state->x.have is depleted. Returns 0 on success, -1 on failure. */ -local int gz_decomp(state) - gz_statep state; -{ +local int gz_decomp(gz_statep state) { int ret = Z_OK; unsigned had; z_streamp strm = &(state->strm); @@ -226,9 +205,7 @@ local int gz_decomp(state) looked for to determine whether to copy or decompress. Returns -1 on error, otherwise 0. gz_fetch() will leave state->how as COPY or GZIP unless the end of the input file has been reached and all data has been processed. */ -local int gz_fetch(state) - gz_statep state; -{ +local int gz_fetch(gz_statep state) { z_streamp strm = &(state->strm); do { @@ -256,10 +233,7 @@ local int gz_fetch(state) } /* Skip len uncompressed bytes of output. Return -1 on error, 0 on success. */ -local int gz_skip(state, len) - gz_statep state; - z_off64_t len; -{ +local int gz_skip(gz_statep state, z_off64_t len) { unsigned n; /* skip over len bytes or reach end-of-file, whichever comes first */ @@ -291,11 +265,7 @@ local int gz_skip(state, len) input. Return the number of bytes read. If zero is returned, either the end of file was reached, or there was an error. state->err must be consulted in that case to determine which. */ -local z_size_t gz_read(state, buf, len) - gz_statep state; - voidp buf; - z_size_t len; -{ +local z_size_t gz_read(gz_statep state, voidp buf, z_size_t len) { z_size_t got; unsigned n; @@ -314,9 +284,9 @@ local z_size_t gz_read(state, buf, len) got = 0; do { /* set n to the maximum amount of len that fits in an unsigned int */ - n = -1; + n = (unsigned)-1; if (n > len) - n = len; + n = (unsigned)len; /* first just try copying data from the output buffer */ if (state->x.have) { @@ -372,11 +342,7 @@ local z_size_t gz_read(state, buf, len) } /* -- see zlib.h -- */ -int ZEXPORT gzread(file, buf, len) - gzFile file; - voidp buf; - unsigned len; -{ +int ZEXPORT gzread(gzFile file, voidp buf, unsigned len) { gz_statep state; /* get internal structure */ @@ -397,7 +363,7 @@ int ZEXPORT gzread(file, buf, len) } /* read len or fewer bytes to buf */ - len = gz_read(state, buf, len); + len = (unsigned)gz_read(state, buf, len); /* check for an error */ if (len == 0 && state->err != Z_OK && state->err != Z_BUF_ERROR) @@ -408,12 +374,7 @@ int ZEXPORT gzread(file, buf, len) } /* -- see zlib.h -- */ -z_size_t ZEXPORT gzfread(buf, size, nitems, file) - voidp buf; - z_size_t size; - z_size_t nitems; - gzFile file; -{ +z_size_t ZEXPORT gzfread(voidp buf, z_size_t size, z_size_t nitems, gzFile file) { z_size_t len; gz_statep state; @@ -444,10 +405,7 @@ z_size_t ZEXPORT gzfread(buf, size, nitems, file) #else # undef gzgetc #endif -int ZEXPORT gzgetc(file) - gzFile file; -{ - int ret; +int ZEXPORT gzgetc(gzFile file) { unsigned char buf[1]; gz_statep state; @@ -469,21 +427,15 @@ int ZEXPORT gzgetc(file) } /* nothing there -- try gz_read() */ - ret = gz_read(state, buf, 1); - return ret < 1 ? -1 : buf[0]; + return gz_read(state, buf, 1) < 1 ? -1 : buf[0]; } -int ZEXPORT gzgetc_(file) -gzFile file; -{ +int ZEXPORT gzgetc_(gzFile file) { return gzgetc(file); } /* -- see zlib.h -- */ -int ZEXPORT gzungetc(c, file) - int c; - gzFile file; -{ +int ZEXPORT gzungetc(int c, gzFile file) { gz_statep state; /* get internal structure */ @@ -491,6 +443,10 @@ int ZEXPORT gzungetc(c, file) return -1; state = (gz_statep)file; + /* in case this was just opened, set up the input buffer */ + if (state->mode == GZ_READ && state->how == LOOK && state->x.have == 0) + (void)gz_look(state); + /* check that we're reading and that there's no (serious) error */ if (state->mode != GZ_READ || (state->err != Z_OK && state->err != Z_BUF_ERROR)) @@ -540,11 +496,7 @@ int ZEXPORT gzungetc(c, file) } /* -- see zlib.h -- */ -char * ZEXPORT gzgets(file, buf, len) - gzFile file; - char *buf; - int len; -{ +char * ZEXPORT gzgets(gzFile file, char *buf, int len) { unsigned left, n; char *str; unsigned char *eol; @@ -604,9 +556,7 @@ char * ZEXPORT gzgets(file, buf, len) } /* -- see zlib.h -- */ -int ZEXPORT gzdirect(file) - gzFile file; -{ +int ZEXPORT gzdirect(gzFile file) { gz_statep state; /* get internal structure */ @@ -624,9 +574,7 @@ int ZEXPORT gzdirect(file) } /* -- see zlib.h -- */ -int ZEXPORT gzclose_r(file) - gzFile file; -{ +int ZEXPORT gzclose_r(gzFile file) { int ret, err; gz_statep state; |