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BUCK
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Makefile
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README.md
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examples
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gzclose.c
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gzcompatibility.h
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gzguts.h
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gzlib.c
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gzread.c
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gzwrite.c
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zstd_zlibwrapper.c
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zstd_zlibwrapper.h
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Editing: gzwrite.c
/* gzwrite.c contains minimal changes required to be compiled with zlibWrapper: * - gz_statep was converted to union to work with -Wstrict-aliasing=1 */ /* gzwrite.c -- zlib functions for writing gzip files * Copyright (C) 2004-2017 Mark Adler * For conditions of distribution and use, see http://www.zlib.net/zlib_license.html */ #include <assert.h> #include "gzguts.h" /* Local functions */ local int gz_init OF((gz_statep)); local int gz_comp OF((gz_statep, int)); local int gz_zero OF((gz_statep, z_off64_t)); local z_size_t gz_write OF((gz_statep, voidpc, z_size_t)); /* Initialize state for writing a gzip file. Mark initialization by setting state.state->size to non-zero. Return -1 on a memory allocation failure, or 0 on success. */ local int gz_init(state) gz_statep state; { int ret; z_streamp strm = &(state.state->strm); /* allocate input buffer (double size for gzprintf) */ state.state->in = (unsigned char*)malloc(state.state->want << 1); if (state.state->in == NULL) { gz_error(state, Z_MEM_ERROR, "out of memory"); return -1; } /* only need output buffer and deflate state if compressing */ if (!state.state->direct) { /* allocate output buffer */ state.state->out = (unsigned char*)malloc(state.state->want); if (state.state->out == NULL) { free(state.state->in); gz_error(state, Z_MEM_ERROR, "out of memory"); return -1; } /* allocate deflate memory, set up for gzip compression */ strm->zalloc = Z_NULL; strm->zfree = Z_NULL; strm->opaque = Z_NULL; ret = deflateInit2(strm, state.state->level, Z_DEFLATED, MAX_WBITS + 16, DEF_MEM_LEVEL, state.state->strategy); if (ret != Z_OK) { free(state.state->out); free(state.state->in); gz_error(state, Z_MEM_ERROR, "out of memory"); return -1; } strm->next_in = NULL; } /* mark state as initialized */ state.state->size = state.state->want; /* initialize write buffer if compressing */ if (!state.state->direct) { strm->avail_out = state.state->size; strm->next_out = state.state->out; state.state->x.next = strm->next_out; } return 0; } /* Compress whatever is at avail_in and next_in and write to the output file. Return -1 if there is an error writing to the output file or if gz_init() fails to allocate memory, otherwise 0. flush is assumed to be a valid deflate() flush value. If flush is Z_FINISH, then the deflate() state is reset to start a new gzip stream. If gz->direct is true, then simply write to the output file without compressing, and ignore flush. */ local int gz_comp(state, flush) gz_statep state; int flush; { int ret, writ; unsigned have, put, max = ((unsigned)-1 >> 2) + 1; z_streamp strm = &(state.state->strm); /* allocate memory if this is the first time through */ if (state.state->size == 0 && gz_init(state) == -1) return -1; /* write directly if requested */ if (state.state->direct) { while (strm->avail_in) { put = strm->avail_in > max ? max : strm->avail_in; writ = (int)write(state.state->fd, strm->next_in, put); if (writ < 0) { gz_error(state, Z_ERRNO, zstrerror()); return -1; } strm->avail_in -= (unsigned)writ; strm->next_in += writ; } return 0; } /* run deflate() on provided input until it produces no more output */ ret = Z_OK; do { /* write out current buffer contents if full, or if flushing, but if doing Z_FINISH then don't write until we get to Z_STREAM_END */ if (strm->avail_out == 0 || (flush != Z_NO_FLUSH && (flush != Z_FINISH || ret == Z_STREAM_END))) { while (strm->next_out > state.state->x.next) { put = strm->next_out - state.state->x.next > (int)max ? max : (unsigned)(strm->next_out - state.state->x.next); writ = (int)write(state.state->fd, state.state->x.next, put); if (writ < 0) { gz_error(state, Z_ERRNO, zstrerror()); return -1; } state.state->x.next += writ; } if (strm->avail_out == 0) { strm->avail_out = state.state->size; strm->next_out = state.state->out; state.state->x.next = state.state->out; } } /* compress */ have = strm->avail_out; ret = deflate(strm, flush); if (ret == Z_STREAM_ERROR) { gz_error(state, Z_STREAM_ERROR, "internal error: deflate stream corrupt"); return -1; } have -= strm->avail_out; } while (have); /* if that completed a deflate stream, allow another to start */ if (flush == Z_FINISH) deflateReset(strm); /* all done, no errors */ return 0; } /* Compress len zeros to output. Return -1 on a write error or memory allocation failure by gz_comp(), or 0 on success. */ local int gz_zero(state, len) gz_statep state; z_off64_t len; { int first; unsigned n; z_streamp strm = &(state.state->strm); /* consume whatever's left in the input buffer */ if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1) return -1; /* compress len zeros (len guaranteed > 0) */ first = 1; while (len) { n = GT_OFF(state.state->size) || (z_off64_t)state.state->size > len ? (unsigned)len : state.state->size; if (first) { memset(state.state->in, 0, n); first = 0; } strm->avail_in = n; strm->next_in = state.state->in; state.state->x.pos += n; if (gz_comp(state, Z_NO_FLUSH) == -1) return -1; len -= n; } return 0; } /* Write len bytes from buf to file. Return the number of bytes written. If the returned value is less than len, then there was an error. */ local z_size_t gz_write(state, buf, len) gz_statep state; voidpc buf; z_size_t len; { z_size_t put = len; /* if len is zero, avoid unnecessary operations */ if (len == 0) return 0; /* allocate memory if this is the first time through */ if (state.state->size == 0 && gz_init(state) == -1) return 0; /* check for seek request */ if (state.state->seek) { state.state->seek = 0; if (gz_zero(state, state.state->skip) == -1) return 0; } /* for small len, copy to input buffer, otherwise compress directly */ if (len < state.state->size) { /* copy to input buffer, compress when full */ do { z_size_t have, copy; if (state.state->strm.avail_in == 0) state.state->strm.next_in = state.state->in; have = (unsigned)((state.state->strm.next_in + state.state->strm.avail_in) - state.state->in); copy = state.state->size - have; if (copy > len) copy = len; memcpy(state.state->in + have, buf, copy); state.state->strm.avail_in += copy; state.state->x.pos += copy; buf = (const char *)buf + copy; len -= copy; if (len && gz_comp(state, Z_NO_FLUSH) == -1) return 0; } while (len); } else { /* consume whatever's left in the input buffer */ if (state.state->strm.avail_in && gz_comp(state, Z_NO_FLUSH) == -1) return 0; /* directly compress user buffer to file */ state.state->strm.next_in = (z_const Bytef *)buf; do { z_size_t n = (unsigned)-1; if (n > len) n = len; state.state->strm.avail_in = (z_uInt)n; state.state->x.pos += n; if (gz_comp(state, Z_NO_FLUSH) == -1) return 0; len -= n; } while (len); } /* input was all buffered or compressed */ return put; } /* -- see zlib.h -- */ int ZEXPORT gzwrite(file, buf, len) gzFile file; voidpc buf; unsigned len; { gz_statep state; /* get internal structure */ if (file == NULL) return 0; state.file = file; /* check that we're writing and that there's no error */ if (state.state->mode != GZ_WRITE || state.state->err != Z_OK) return 0; /* since an int is returned, make sure len fits in one, otherwise return with an error (this avoids a flaw in the interface) */ if ((int)len < 0) { gz_error(state, Z_DATA_ERROR, "requested length does not fit in int"); return 0; } /* write len bytes from buf (the return value will fit in an int) */ return (int)gz_write(state, buf, len); } /* -- see zlib.h -- */ z_size_t ZEXPORT gzfwrite(buf, size, nitems, file) voidpc buf; z_size_t size; z_size_t nitems; gzFile file; { z_size_t len; gz_statep state; /* get internal structure */ assert(size != 0); if (file == NULL) return 0; state.file = file; /* check that we're writing and that there's no error */ if (state.state->mode != GZ_WRITE || state.state->err != Z_OK) return 0; /* compute bytes to read -- error on overflow */ len = nitems * size; if (size && (len / size != nitems)) { gz_error(state, Z_STREAM_ERROR, "request does not fit in a size_t"); return 0; } /* write len bytes to buf, return the number of full items written */ return len ? gz_write(state, buf, len) / size : 0; } /* -- see zlib.h -- */ int ZEXPORT gzputc(file, c) gzFile file; int c; { unsigned have; unsigned char buf[1]; gz_statep state; z_streamp strm; /* get internal structure */ if (file == NULL) return -1; state.file = file; strm = &(state.state->strm); /* check that we're writing and that there's no error */ if (state.state->mode != GZ_WRITE || state.state->err != Z_OK) return -1; /* check for seek request */ if (state.state->seek) { state.state->seek = 0; if (gz_zero(state, state.state->skip) == -1) return -1; } /* try writing to input buffer for speed (state.state->size == 0 if buffer not initialized) */ if (state.state->size) { if (strm->avail_in == 0) strm->next_in = state.state->in; have = (unsigned)((strm->next_in + strm->avail_in) - state.state->in); if (have < state.state->size) { state.state->in[have] = (unsigned char)c; strm->avail_in++; state.state->x.pos++; return c & 0xff; } } /* no room in buffer or not initialized, use gz_write() */ buf[0] = (unsigned char)c; if (gz_write(state, buf, 1) != 1) return -1; return c & 0xff; } /* -- see zlib.h -- */ int ZEXPORT gzputs(file, str) gzFile file; const char *str; { int ret; z_size_t len; gz_statep state; /* get internal structure */ if (file == NULL) return -1; state.file = file; /* check that we're writing and that there's no error */ if (state.state->mode != GZ_WRITE || state.state->err != Z_OK) return -1; /* write string */ len = strlen(str); ret = (int)gz_write(state, str, len); return ret == 0 && len != 0 ? -1 : ret; } #if defined(STDC) || defined(Z_HAVE_STDARG_H) #include <stdarg.h> /* -- see zlib.h -- */ int ZEXPORTVA gzvprintf(gzFile file, const char *format, va_list va) { int len; unsigned left; char *next; gz_statep state; z_streamp strm; /* get internal structure */ if (file == NULL) return Z_STREAM_ERROR; state.file = file; strm = &(state.state->strm); /* check that we're writing and that there's no error */ if (state.state->mode != GZ_WRITE || state.state->err != Z_OK) return Z_STREAM_ERROR; /* make sure we have some buffer space */ if (state.state->size == 0 && gz_init(state) == -1) return state.state->err; /* check for seek request */ if (state.state->seek) { state.state->seek = 0; if (gz_zero(state, state.state->skip) == -1) return state.state->err; } /* do the printf() into the input buffer, put length in len -- the input buffer is double-sized just for this function, so there is guaranteed to be state.state->size bytes available after the current contents */ if (strm->avail_in == 0) strm->next_in = state.state->in; next = (char *)(state.state->in + (strm->next_in - state.state->in) + strm->avail_in); next[state.state->size - 1] = 0; #ifdef NO_vsnprintf # ifdef HAS_vsprintf_void (void)vsprintf(next, format, va); for (len = 0; len < state.state->size; len++) if (next[len] == 0) break; # else len = vsprintf(next, format, va); # endif #else # ifdef HAS_vsnprintf_void (void)vsnprintf(next, state.state->size, format, va); len = strlen(next); # else len = vsnprintf(next, state.state->size, format, va); # endif #endif /* check that printf() results fit in buffer */ if (len == 0 || (unsigned)len >= state.state->size || next[state.state->size - 1] != 0) return 0; /* update buffer and position, compress first half if past that */ strm->avail_in += (unsigned)len; state.state->x.pos += len; if (strm->avail_in >= state.state->size) { left = strm->avail_in - state.state->size; strm->avail_in = state.state->size; if (gz_comp(state, Z_NO_FLUSH) == -1) return state.state->err; memcpy(state.state->in, state.state->in + state.state->size, left); strm->next_in = state.state->in; strm->avail_in = left; } return len; } int ZEXPORTVA gzprintf(gzFile file, const char *format, ...) { va_list va; int ret; va_start(va, format); ret = gzvprintf(file, format, va); va_end(va); return ret; } #else /* !STDC && !Z_HAVE_STDARG_H */ /* -- see zlib.h -- */ int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20) gzFile file; const char *format; int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20; { unsigned len, left; char *next; gz_statep state; z_streamp strm; /* get internal structure */ if (file == NULL) return Z_STREAM_ERROR; state = (gz_statep)file; strm = &(state.state->strm); /* check that can really pass pointer in ints */ if (sizeof(int) != sizeof(void *)) return Z_STREAM_ERROR; /* check that we're writing and that there's no error */ if (state.state->mode != GZ_WRITE || state.state->err != Z_OK) return Z_STREAM_ERROR; /* make sure we have some buffer space */ if (state.state->size == 0 && gz_init(state) == -1) return state.state->error; /* check for seek request */ if (state.state->seek) { state.state->seek = 0; if (gz_zero(state, state.state->skip) == -1) return state.state->error; } /* do the printf() into the input buffer, put length in len -- the input buffer is double-sized just for this function, so there is guaranteed to be state.state->size bytes available after the current contents */ if (strm->avail_in == 0) strm->next_in = state.state->in; next = (char *)(strm->next_in + strm->avail_in); next[state.state->size - 1] = 0; #ifdef NO_snprintf # ifdef HAS_sprintf_void sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); for (len = 0; len < size; len++) if (next[len] == 0) break; # else len = sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); # endif #else # ifdef HAS_snprintf_void snprintf(next, state.state->size, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); len = strlen(next); # else len = snprintf(next, state.state->size, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); # endif #endif /* check that printf() results fit in buffer */ if (len == 0 || len >= state.state->size || next[state.state->size - 1] != 0) return 0; /* update buffer and position, compress first half if past that */ strm->avail_in += len; state.state->x.pos += len; if (strm->avail_in >= state.state->size) { left = strm->avail_in - state.state->size; strm->avail_in = state.state->size; if (gz_comp(state, Z_NO_FLUSH) == -1) return state.state->err; memcpy(state.state->in, state.state->in + state.state->size, left); strm->next_in = state.state->in; strm->avail_in = left; } return (int)len; } #endif /* -- see zlib.h -- */ int ZEXPORT gzflush(file, flush) gzFile file; int flush; { gz_statep state; /* get internal structure */ if (file == NULL) return Z_STREAM_ERROR; state.file = file; /* check that we're writing and that there's no error */ if (state.state->mode != GZ_WRITE || state.state->err != Z_OK) return Z_STREAM_ERROR; /* check flush parameter */ if (flush < 0 || flush > Z_FINISH) return Z_STREAM_ERROR; /* check for seek request */ if (state.state->seek) { state.state->seek = 0; if (gz_zero(state, state.state->skip) == -1) return state.state->err; } /* compress remaining data with requested flush */ (void)gz_comp(state, flush); return state.state->err; } /* -- see zlib.h -- */ int ZEXPORT gzsetparams(file, level, strategy) gzFile file; int level; int strategy; { gz_statep state; z_streamp strm; /* get internal structure */ if (file == NULL) return Z_STREAM_ERROR; state.file = file; strm = &(state.state->strm); /* check that we're writing and that there's no error */ if (state.state->mode != GZ_WRITE || state.state->err != Z_OK) return Z_STREAM_ERROR; /* if no change is requested, then do nothing */ if (level == state.state->level && strategy == state.state->strategy) return Z_OK; /* check for seek request */ if (state.state->seek) { state.state->seek = 0; if (gz_zero(state, state.state->skip) == -1) return state.state->err; } /* change compression parameters for subsequent input */ if (state.state->size) { /* flush previous input with previous parameters before changing */ if (strm->avail_in && gz_comp(state, Z_BLOCK) == -1) return state.state->err; deflateParams(strm, level, strategy); } state.state->level = level; state.state->strategy = strategy; return Z_OK; } /* -- see zlib.h -- */ int ZEXPORT gzclose_w(file) gzFile file; { int ret = Z_OK; gz_statep state; /* get internal structure */ if (file == NULL) return Z_STREAM_ERROR; state.file = file; /* check that we're writing */ if (state.state->mode != GZ_WRITE) return Z_STREAM_ERROR; /* check for seek request */ if (state.state->seek) { state.state->seek = 0; if (gz_zero(state, state.state->skip) == -1) ret = state.state->err; } /* flush, free memory, and close file */ if (gz_comp(state, Z_FINISH) == -1) ret = state.state->err; if (state.state->size) { if (!state.state->direct) { (void)deflateEnd(&(state.state->strm)); free(state.state->out); } free(state.state->in); } gz_error(state, Z_OK, NULL); free(state.state->path); if (close(state.state->fd) == -1) ret = Z_ERRNO; free(state.state); return ret; }
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