| /* gzwrite.c -- zlib functions for writing gzip files |
| * Copyright (C) 2004, 2005, 2010, 2011, 2012 Mark Adler |
| * For conditions of distribution and use, see copyright notice in zlib.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)); |
| |
| /* Initialize state for writing a gzip file. Mark initialization by setting |
| state->size to non-zero. Return -1 on failure or 0 on success. */ |
| local int gz_init(state) |
| gz_statep state; |
| { |
| int ret; |
| z_streamp strm = &(state->strm); |
| |
| /* allocate input buffer */ |
| state->in = malloc(state->want); |
| if (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->direct) { |
| /* allocate output buffer */ |
| state->out = 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 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. 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, got; |
| unsigned have; |
| z_streamp strm = &(state->strm); |
| |
| /* allocate memory if this is the first time through */ |
| 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 { |
| /* 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))) { |
| 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; |
| } |
| if (strm->avail_out == 0) { |
| strm->avail_out = state->size; |
| strm->next_out = state->out; |
| } |
| state->x.next = strm->next_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 error, 0 on success. */ |
| local int gz_zero(state, len) |
| gz_statep state; |
| z_off64_t len; |
| { |
| int first; |
| unsigned n; |
| z_streamp strm = &(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->size) || (z_off64_t)state->size > len ? |
| (unsigned)len : state->size; |
| if (first) { |
| memset(state->in, 0, n); |
| first = 0; |
| } |
| strm->avail_in = n; |
| strm->next_in = state->in; |
| state->x.pos += n; |
| if (gz_comp(state, Z_NO_FLUSH) == -1) |
| return -1; |
| len -= n; |
| } |
| return 0; |
| } |
| |
| /* -- see zlib.h -- */ |
| int ZEXPORT gzwrite(file, buf, len) |
| gzFile file; |
| voidpc buf; |
| unsigned len; |
| { |
| unsigned put = len; |
| unsigned n; |
| gz_statep state; |
| z_streamp strm; |
| |
| /* get internal structure */ |
| if (file == NULL) |
| return 0; |
| state = (gz_statep)file; |
| strm = &(state->strm); |
| |
| /* check that we're writing and that there's no error */ |
| if (state->mode != GZ_WRITE || state->err != Z_OK) |
| return 0; |
| |
| /* 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_DATA_ERROR, "requested length does not fit in int"); |
| return 0; |
| } |
| |
| /* if len is zero, avoid unnecessary operations */ |
| if (len == 0) |
| return 0; |
| |
| /* allocate memory if this is the first time through */ |
| if (state->size == 0 && gz_init(state) == -1) |
| return 0; |
| |
| /* check for seek request */ |
| if (state->seek) { |
| state->seek = 0; |
| if (gz_zero(state, state->skip) == -1) |
| return 0; |
| } |
| |
| /* for small len, copy to input buffer, otherwise compress directly */ |
| if (len < state->size) { |
| /* copy to input buffer, compress when full */ |
| do { |
| 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->x.pos += n; |
| buf = (char *)buf + n; |
| len -= n; |
| if (len && gz_comp(state, Z_NO_FLUSH) == -1) |
| return 0; |
| } while (len); |
| } |
| else { |
| /* consume whatever's left in the input buffer */ |
| if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1) |
| return 0; |
| |
| /* directly compress user buffer to file */ |
| strm->avail_in = len; |
| strm->next_in = (voidp)buf; |
| state->x.pos += len; |
| if (gz_comp(state, Z_NO_FLUSH) == -1) |
| return 0; |
| } |
| |
| /* input was all buffered or compressed (put will fit in int) */ |
| return (int)put; |
| } |
| |
| /* -- see zlib.h -- */ |
| int ZEXPORT gzputc(file, c) |
| gzFile file; |
| int c; |
| { |
| unsigned char buf[1]; |
| gz_statep state; |
| z_streamp strm; |
| |
| /* get internal structure */ |
| if (file == NULL) |
| return -1; |
| state = (gz_statep)file; |
| strm = &(state->strm); |
| |
| /* check that we're writing and that there's no error */ |
| if (state->mode != GZ_WRITE || state->err != Z_OK) |
| return -1; |
| |
| /* check for seek request */ |
| if (state->seek) { |
| state->seek = 0; |
| if (gz_zero(state, state->skip) == -1) |
| return -1; |
| } |
| |
| /* try writing to input buffer for speed (state->size == 0 if buffer not |
| initialized) */ |
| if (strm->avail_in < state->size) { |
| if (strm->avail_in == 0) |
| strm->next_in = state->in; |
| strm->next_in[strm->avail_in++] = c; |
| 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 & 0xff; |
| } |
| |
| /* -- see zlib.h -- */ |
| int ZEXPORT gzputs(file, str) |
| gzFile file; |
| const char *str; |
| { |
| int ret; |
| unsigned len; |
| |
| /* write string */ |
| len = (unsigned)strlen(str); |
| ret = gzwrite(file, 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 gzprintf (gzFile file, const char *format, ...) |
| { |
| int size, len; |
| gz_statep state; |
| z_streamp strm; |
| va_list va; |
| |
| /* get internal structure */ |
| if (file == NULL) |
| return -1; |
| state = (gz_statep)file; |
| strm = &(state->strm); |
| |
| /* check that we're writing and that there's no error */ |
| if (state->mode != GZ_WRITE || state->err != Z_OK) |
| return 0; |
| |
| /* make sure we have some buffer space */ |
| if (state->size == 0 && gz_init(state) == -1) |
| return 0; |
| |
| /* check for seek request */ |
| if (state->seek) { |
| state->seek = 0; |
| if (gz_zero(state, state->skip) == -1) |
| return 0; |
| } |
| |
| /* consume whatever's left in the input buffer */ |
| if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1) |
| return 0; |
| |
| /* 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((char *)(state->in), format, va); |
| va_end(va); |
| for (len = 0; len < size; len++) |
| if (state->in[len] == 0) break; |
| # else |
| len = vsprintf((char *)(state->in), format, va); |
| va_end(va); |
| # endif |
| #else |
| # ifdef HAS_vsnprintf_void |
| (void)vsnprintf((char *)(state->in), size, format, va); |
| va_end(va); |
| len = strlen((char *)(state->in)); |
| # else |
| len = vsnprintf((char *)(state->in), size, format, va); |
| va_end(va); |
| # endif |
| #endif |
| |
| /* check that printf() results fit in buffer */ |
| if (len <= 0 || len >= (int)size || state->in[size - 1] != 0) |
| return 0; |
| |
| /* update buffer and position, defer compression until needed */ |
| strm->avail_in = (unsigned)len; |
| strm->next_in = state->in; |
| state->x.pos += len; |
| return len; |
| } |
| |
| #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; |
| { |
| int size, len; |
| gz_statep state; |
| z_streamp strm; |
| |
| /* get internal structure */ |
| if (file == NULL) |
| return -1; |
| 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; |
| |
| /* make sure we have some buffer space */ |
| if (state->size == 0 && gz_init(state) == -1) |
| return 0; |
| |
| /* check for seek request */ |
| if (state->seek) { |
| state->seek = 0; |
| if (gz_zero(state, state->skip) == -1) |
| return 0; |
| } |
| |
| /* consume whatever's left in the input buffer */ |
| if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1) |
| return 0; |
| |
| /* do the printf() into the input buffer, put length in len */ |
| size = (int)(state->size); |
| state->in[size - 1] = 0; |
| #ifdef NO_snprintf |
| # ifdef HAS_sprintf_void |
| 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((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((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((char *)(state->in)); |
| # else |
| 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 |
| |
| /* check that printf() results fit in buffer */ |
| if (len <= 0 || len >= (int)size || state->in[size - 1] != 0) |
| return 0; |
| |
| /* update buffer and position, defer compression until needed */ |
| strm->avail_in = (unsigned)len; |
| strm->next_in = state->in; |
| state->x.pos += len; |
| return len; |
| } |
| |
| #endif |
| |
| /* -- see zlib.h -- */ |
| int ZEXPORT gzflush(file, flush) |
| gzFile file; |
| int flush; |
| { |
| gz_statep state; |
| |
| /* get internal structure */ |
| if (file == NULL) |
| return -1; |
| state = (gz_statep)file; |
| |
| /* check that we're writing and that there's no error */ |
| if (state->mode != GZ_WRITE || 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->seek) { |
| state->seek = 0; |
| if (gz_zero(state, state->skip) == -1) |
| return -1; |
| } |
| |
| /* compress remaining data with requested flush */ |
| gz_comp(state, flush); |
| return 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 = (gz_statep)file; |
| strm = &(state->strm); |
| |
| /* check that we're writing and that there's no error */ |
| if (state->mode != GZ_WRITE || state->err != Z_OK) |
| return Z_STREAM_ERROR; |
| |
| /* if no change is requested, then do nothing */ |
| if (level == state->level && strategy == state->strategy) |
| return Z_OK; |
| |
| /* check for seek request */ |
| if (state->seek) { |
| state->seek = 0; |
| if (gz_zero(state, state->skip) == -1) |
| return -1; |
| } |
| |
| /* change compression parameters for subsequent input */ |
| if (state->size) { |
| /* flush previous input with previous parameters before changing */ |
| if (strm->avail_in && gz_comp(state, Z_PARTIAL_FLUSH) == -1) |
| return state->err; |
| deflateParams(strm, level, strategy); |
| } |
| state->level = level; |
| 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 = (gz_statep)file; |
| |
| /* check that we're writing */ |
| if (state->mode != GZ_WRITE) |
| return Z_STREAM_ERROR; |
| |
| /* check for seek request */ |
| if (state->seek) { |
| state->seek = 0; |
| if (gz_zero(state, state->skip) == -1) |
| ret = state->err; |
| } |
| |
| /* flush, free memory, and close file */ |
| if (state->size) { |
| if (gz_comp(state, Z_FINISH) == -1) |
| ret = state->err; |
| if (!state->direct) { |
| (void)deflateEnd(&(state->strm)); |
| free(state->out); |
| } |
| free(state->in); |
| } |
| gz_error(state, Z_OK, NULL); |
| free(state->path); |
| if (close(state->fd) == -1) |
| ret = Z_ERRNO; |
| free(state); |
| return ret; |
| } |