diff options
Diffstat (limited to 'gzwrite.c')
| -rw-r--r-- | gzwrite.c | 196 |
1 files changed, 121 insertions, 75 deletions
@@ -1,5 +1,5 @@ /* gzwrite.c -- zlib functions for writing gzip files - * Copyright (C) 2004, 2005, 2010 Mark Adler + * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013 Mark Adler * For conditions of distribution and use, see copyright notice in zlib.h */ @@ -18,44 +18,55 @@ local int gz_init(state) int ret; z_streamp strm = &(state->strm); - /* allocate input and output buffers */ - state->in = malloc(state->want); - state->out = malloc(state->want); - if (state->in == NULL || state->out == NULL) { - if (state->out != NULL) - free(state->out); - if (state->in != NULL) - free(state->in); + /* allocate input buffer */ + state->in = (unsigned char *)malloc(state->want); + if (state->in == NULL) { 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->level, Z_DEFLATED, - 15 + 16, 8, state->strategy); - if (ret != Z_OK) { - free(state->in); - gz_error(state, Z_MEM_ERROR, "out of memory"); - return -1; + /* only need output buffer and deflate state if compressing */ + if (!state->direct) { + /* allocate output buffer */ + state->out = (unsigned char *)malloc(state->want); + if (state->out == NULL) { + free(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->level, Z_DEFLATED, + MAX_WBITS + 16, DEF_MEM_LEVEL, state->strategy); + if (ret != Z_OK) { + free(state->out); + free(state->in); + gz_error(state, Z_MEM_ERROR, "out of memory"); + return -1; + } } /* mark state as initialized */ state->size = state->want; - /* initialize write buffer */ - strm->avail_out = state->size; - strm->next_out = state->out; - state->next = strm->next_out; + /* initialize write buffer if compressing */ + if (!state->direct) { + strm->avail_out = state->size; + strm->next_out = state->out; + 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, 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. */ + 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; @@ -68,6 +79,17 @@ local int gz_comp(state, flush) if (state->size == 0 && gz_init(state) == -1) return -1; + /* write directly if requested */ + if (state->direct) { + got = write(state->fd, strm->next_in, strm->avail_in); + if (got < 0 || (unsigned)got != strm->avail_in) { + gz_error(state, Z_ERRNO, zstrerror()); + return -1; + } + strm->avail_in = 0; + return 0; + } + /* run deflate() on provided input until it produces no more output */ ret = Z_OK; do { @@ -75,8 +97,8 @@ local int gz_comp(state, flush) 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))) { - have = (unsigned)(strm->next_out - state->next); - if (have && ((got = write(state->fd, state->next, have)) < 0 || + have = (unsigned)(strm->next_out - state->x.next); + if (have && ((got = write(state->fd, state->x.next, have)) < 0 || (unsigned)got != have)) { gz_error(state, Z_ERRNO, zstrerror()); return -1; @@ -85,7 +107,7 @@ local int gz_comp(state, flush) strm->avail_out = state->size; strm->next_out = state->out; } - state->next = strm->next_out; + state->x.next = strm->next_out; } /* compress */ @@ -131,7 +153,7 @@ local int gz_zero(state, len) } strm->avail_in = n; strm->next_in = state->in; - state->pos += n; + state->x.pos += n; if (gz_comp(state, Z_NO_FLUSH) == -1) return -1; len -= n; @@ -146,7 +168,6 @@ int ZEXPORT gzwrite(file, buf, len) unsigned len; { unsigned put = len; - unsigned n; gz_statep state; z_streamp strm; @@ -163,7 +184,7 @@ int ZEXPORT gzwrite(file, buf, len) /* 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) { - gz_error(state, Z_BUF_ERROR, "requested length does not fit in int"); + gz_error(state, Z_DATA_ERROR, "requested length does not fit in int"); return 0; } @@ -186,16 +207,19 @@ int ZEXPORT gzwrite(file, buf, len) if (len < state->size) { /* copy to input buffer, compress when full */ do { + unsigned have, copy; + if (strm->avail_in == 0) strm->next_in = state->in; - n = state->size - strm->avail_in; - if (n > len) - n = len; - memcpy(strm->next_in + strm->avail_in, buf, n); - strm->avail_in += n; - state->pos += n; - buf = (char *)buf + n; - len -= n; + have = (unsigned)((strm->next_in + strm->avail_in) - state->in); + copy = state->size - have; + if (copy > len) + copy = len; + memcpy(state->in + have, buf, copy); + strm->avail_in += copy; + state->x.pos += copy; + buf = (const char *)buf + copy; + len -= copy; if (len && gz_comp(state, Z_NO_FLUSH) == -1) return 0; } while (len); @@ -207,8 +231,8 @@ int ZEXPORT gzwrite(file, buf, len) /* directly compress user buffer to file */ strm->avail_in = len; - strm->next_in = (voidp)buf; - state->pos += len; + strm->next_in = (z_const Bytef *)buf; + state->x.pos += len; if (gz_comp(state, Z_NO_FLUSH) == -1) return 0; } @@ -222,6 +246,7 @@ int ZEXPORT gzputc(file, c) gzFile file; int c; { + unsigned have; unsigned char buf[1]; gz_statep state; z_streamp strm; @@ -245,19 +270,23 @@ int ZEXPORT gzputc(file, c) /* try writing to input buffer for speed (state->size == 0 if buffer not initialized) */ - if (strm->avail_in < state->size) { + if (state->size) { if (strm->avail_in == 0) strm->next_in = state->in; - strm->next_in[strm->avail_in++] = c; - state->pos++; - return c; + have = (unsigned)((strm->next_in + strm->avail_in) - state->in); + if (have < state->size) { + state->in[have] = c; + strm->avail_in++; + state->x.pos++; + return c & 0xff; + } } /* no room in buffer or not initialized, use gz_write() */ buf[0] = c; if (gzwrite(file, buf, 1) != 1) return -1; - return c; + return c & 0xff; } /* -- see zlib.h -- */ @@ -274,16 +303,15 @@ int ZEXPORT gzputs(file, str) return ret == 0 && len != 0 ? -1 : ret; } -#ifdef STDC +#if defined(STDC) || defined(Z_HAVE_STDARG_H) #include <stdarg.h> /* -- see zlib.h -- */ -int ZEXPORTVA gzprintf (gzFile file, const char *format, ...) +int ZEXPORTVA gzvprintf(gzFile file, const char *format, va_list va) { int size, len; gz_statep state; z_streamp strm; - va_list va; /* get internal structure */ if (file == NULL) @@ -313,25 +341,20 @@ int ZEXPORTVA gzprintf (gzFile file, const char *format, ...) /* do the printf() into the input buffer, put length in len */ size = (int)(state->size); state->in[size - 1] = 0; - va_start(va, format); #ifdef NO_vsnprintf # ifdef HAS_vsprintf_void - (void)vsprintf(state->in, format, va); - va_end(va); + (void)vsprintf((char *)(state->in), format, va); for (len = 0; len < size; len++) if (state->in[len] == 0) break; # else - len = vsprintf(state->in, format, va); - va_end(va); + len = vsprintf((char *)(state->in), format, va); # endif #else # ifdef HAS_vsnprintf_void - (void)vsnprintf(state->in, size, format, va); - va_end(va); - len = strlen(state->in); + (void)vsnprintf((char *)(state->in), size, format, va); + len = strlen((char *)(state->in)); # else len = vsnprintf((char *)(state->in), size, format, va); - va_end(va); # endif #endif @@ -342,11 +365,22 @@ int ZEXPORTVA gzprintf (gzFile file, const char *format, ...) /* update buffer and position, defer compression until needed */ strm->avail_in = (unsigned)len; strm->next_in = state->in; - state->pos += len; + state->x.pos += len; return len; } -#else /* !STDC */ +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, @@ -366,6 +400,10 @@ int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, state = (gz_statep)file; strm = &(state->strm); + /* check that can really pass pointer in ints */ + if (sizeof(int) != sizeof(void *)) + return 0; + /* check that we're writing and that there's no error */ if (state->mode != GZ_WRITE || state->err != Z_OK) return 0; @@ -390,22 +428,23 @@ int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, state->in[size - 1] = 0; #ifdef NO_snprintf # ifdef HAS_sprintf_void - sprintf(state->in, format, a1, a2, a3, a4, a5, a6, a7, a8, + sprintf((char *)(state->in), 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 (state->in[len] == 0) break; # else - len = sprintf(state->in, format, a1, a2, a3, a4, a5, a6, a7, a8, - a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); + len = sprintf((char *)(state->in), 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(state->in, size, format, a1, a2, a3, a4, a5, a6, a7, a8, + snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); - len = strlen(state->in); + len = strlen((char *)(state->in)); # else - len = snprintf(state->in, size, format, a1, a2, a3, a4, a5, a6, a7, a8, - a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); + len = snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6, + a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, + a19, a20); # endif #endif @@ -416,7 +455,7 @@ int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, /* update buffer and position, defer compression until needed */ strm->avail_in = (unsigned)len; strm->next_in = state->in; - state->pos += len; + state->x.pos += len; return len; } @@ -500,7 +539,7 @@ int ZEXPORT gzsetparams(file, level, strategy) int ZEXPORT gzclose_w(file) gzFile file; { - int ret = 0; + int ret = Z_OK; gz_statep state; /* get internal structure */ @@ -515,17 +554,24 @@ int ZEXPORT gzclose_w(file) /* check for seek request */ if (state->seek) { state->seek = 0; - ret += gz_zero(state, state->skip); + if (gz_zero(state, state->skip) == -1) + ret = state->err; } /* flush, free memory, and close file */ - ret += gz_comp(state, Z_FINISH); - (void)deflateEnd(&(state->strm)); - free(state->out); - free(state->in); + if (gz_comp(state, Z_FINISH) == -1) + ret = state->err; + if (state->size) { + if (!state->direct) { + (void)deflateEnd(&(state->strm)); + free(state->out); + } + free(state->in); + } gz_error(state, Z_OK, NULL); free(state->path); - ret += close(state->fd); + if (close(state->fd) == -1) + ret = Z_ERRNO; free(state); - return ret ? Z_ERRNO : Z_OK; + return ret; } |