aboutsummaryrefslogtreecommitdiff
path: root/zlib/gzwrite.c
diff options
context:
space:
mode:
Diffstat (limited to 'zlib/gzwrite.c')
-rw-r--r--zlib/gzwrite.c565
1 files changed, 565 insertions, 0 deletions
diff --git a/zlib/gzwrite.c b/zlib/gzwrite.c
new file mode 100644
index 000000000..27cb3428e
--- /dev/null
+++ b/zlib/gzwrite.c
@@ -0,0 +1,565 @@
+/* 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;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-27 14:10:22 +0000