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-rw-r--r--neozip/gzwrite.c509
1 files changed, 509 insertions, 0 deletions
diff --git a/neozip/gzwrite.c b/neozip/gzwrite.c
new file mode 100644
index 0000000000..5d1fdd7776
--- /dev/null
+++ b/neozip/gzwrite.c
@@ -0,0 +1,509 @@
+/* gzwrite.c -- zlib functions for writing gzip files
+ * Copyright (C) 2004-2019 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#include "zbuild.h"
+#include "zutil_p.h"
+#include <stdarg.h>
+#include "gzguts.h"
+
+/* Local functions */
+static int gz_write_init(gz_state *);
+static int gz_comp(gz_state *, int);
+static int gz_zero(gz_state *, z_off64_t);
+static size_t gz_write(gz_state *, void const *, size_t);
+
+/* Initialize state for writing a gzip file. Mark initialization by setting
+ state->size to non-zero. Return -1 on a memory allocation failure, or 0 on
+ success. */
+static int gz_write_init(gz_state *state) {
+ PREFIX3(stream) *strm = &(state->strm);
+
+ /* Allocate gz buffers */
+ if (gz_buffer_alloc(state) != 0) {
+ PREFIX(gz_error)(state, Z_MEM_ERROR, "out of memory");
+ return -1;
+ }
+
+ /* only need deflate state if compressing */
+ if (!state->direct) {
+ /* allocate deflate memory, set up for gzip compression */
+ int ret = PREFIX(deflateInit2)(strm, state->level, Z_DEFLATED, MAX_WBITS + 16, DEF_MEM_LEVEL, state->strategy);
+ if (ret != Z_OK) {
+ gz_buffer_free(state);
+ if (ret == Z_MEM_ERROR) {
+ PREFIX(gz_error)(state, Z_MEM_ERROR, "out of memory");
+ } else {
+ PREFIX(gz_error)(state, Z_STREAM_ERROR, "invalid compression parameters");
+ }
+ return -1;
+ }
+ strm->next_in = NULL;
+
+ /* initialize write buffer */
+ 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 or if gz_write_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. */
+static int gz_comp(gz_state *state, int flush) {
+ int ret;
+ ssize_t got;
+ unsigned have;
+ PREFIX3(stream) *strm = &(state->strm);
+
+ /* allocate memory if this is the first time through */
+ if (state->size == 0 && gz_write_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) {
+ PREFIX(gz_error)(state, Z_ERRNO, zstrerror());
+ return -1;
+ }
+ strm->avail_in = 0;
+ return 0;
+ }
+
+ /* check for a pending reset */
+ if (state->reset) {
+ /* don't start a new gzip member unless there is data to write */
+ if (strm->avail_in == 0)
+ return 0;
+ PREFIX(deflateReset)(strm);
+ state->reset = 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, (unsigned long)have)) < 0 || (unsigned)got != have)) {
+ PREFIX(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 = state->out;
+ }
+ state->x.next = strm->next_out;
+ }
+
+ /* compress */
+ have = strm->avail_out;
+ ret = PREFIX(deflate)(strm, flush);
+ if (ret == Z_STREAM_ERROR) {
+ PREFIX(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)
+ state->reset = 1;
+ /* 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. */
+static int gz_zero(gz_state *state, z_off64_t len) {
+ int first;
+ unsigned n;
+ PREFIX3(stream) *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;
+}
+
+/* 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. */
+static size_t gz_write(gz_state *state, void const *buf, size_t len) {
+ 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->size == 0 && gz_write_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 {
+ unsigned have, copy;
+
+ if (state->strm.avail_in == 0)
+ state->strm.next_in = state->in;
+ have = (unsigned)((state->strm.next_in + state->strm.avail_in) -
+ state->in);
+ copy = state->size - have;
+ if (copy > len)
+ copy = (unsigned)len;
+ memcpy(state->in + have, buf, copy);
+ state->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);
+ } else {
+ /* consume whatever's left in the input buffer */
+ if (state->strm.avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
+ return 0;
+
+ /* directly compress user buffer to file */
+ state->strm.next_in = (z_const unsigned char *) buf;
+ do {
+ unsigned n = (unsigned)-1;
+ if (n > len)
+ n = (unsigned)len;
+ state->strm.avail_in = n;
+ 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 -- */
+z_int32_t Z_EXPORT PREFIX(gzwrite)(gzFile file, void const *buf, z_uint32_t len) {
+ gz_state *state;
+
+ /* get internal structure */
+ if (file == NULL)
+ return 0;
+ state = (gz_state *)file;
+
+ /* 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 a flaw in the interface) */
+ if ((z_int32_t)len < 0) {
+ PREFIX(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 (z_int32_t)gz_write(state, buf, len);
+}
+
+/* -- see zlib.h -- */
+size_t Z_EXPORT PREFIX(gzfwrite)(void const *buf, size_t size, size_t nitems, gzFile file) {
+ size_t len;
+ gz_state *state;
+
+ /* Exit early if size is zero, also prevents potential division by zero */
+ if (size == 0)
+ return 0;
+
+ /* get internal structure */
+ if (file == NULL)
+ return 0;
+ state = (gz_state *)file;
+
+ /* check that we're writing and that there's no error */
+ if (state->mode != GZ_WRITE || state->err != Z_OK)
+ return 0;
+
+ /* compute bytes to read -- error on overflow */
+ len = nitems * size;
+ if (len / size != nitems) {
+ PREFIX(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 -- */
+z_int32_t Z_EXPORT PREFIX(gzputc)(gzFile file, z_int32_t c) {
+ unsigned have;
+ unsigned char buf[1];
+ gz_state *state;
+ PREFIX3(stream) *strm;
+
+ /* get internal structure */
+ if (file == NULL)
+ return -1;
+ state = (gz_state *)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 (state->size) {
+ if (strm->avail_in == 0)
+ strm->next_in = state->in;
+ have = (unsigned)((strm->next_in + strm->avail_in) - state->in);
+ if (have < state->size) {
+ state->in[have] = (unsigned char)c;
+ strm->avail_in++;
+ 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 -- */
+z_int32_t Z_EXPORT PREFIX(gzputs)(gzFile file, const char *s) {
+ size_t len, put;
+ gz_state *state;
+
+ /* get internal structure */
+ if (file == NULL)
+ return -1;
+ state = (gz_state *)file;
+
+ /* check that we're writing and that there's no error */
+ if (state->mode != GZ_WRITE || state->err != Z_OK)
+ return -1;
+
+ /* write string */
+ len = strlen(s);
+ if ((int)len < 0 || (unsigned)len != len) {
+ PREFIX(gz_error)(state, Z_STREAM_ERROR, "string length does not fit in int");
+ return -1;
+ }
+ put = gz_write(state, s, len);
+ return put < len ? -1 : (int)len;
+}
+
+/* -- see zlib.h -- */
+z_int32_t Z_EXPORTVA PREFIX(gzvprintf)(gzFile file, const char *format, va_list va) {
+ int len;
+ unsigned left;
+ char *next;
+ gz_state *state;
+ PREFIX3(stream) *strm;
+
+ /* get internal structure */
+ if (file == NULL)
+ return Z_STREAM_ERROR;
+ state = (gz_state *)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;
+
+ /* make sure we have some buffer space */
+ if (state->size == 0 && gz_write_init(state) == -1)
+ return state->err;
+
+ /* check for seek request */
+ if (state->seek) {
+ state->seek = 0;
+ if (gz_zero(state, state->skip) == -1)
+ return 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->size bytes available after the current contents */
+ if (strm->avail_in == 0)
+ strm->next_in = state->in;
+ next = (char *)(state->in + (strm->next_in - state->in) + strm->avail_in);
+ next[state->size - 1] = 0;
+ len = vsnprintf(next, state->size, format, va);
+
+ /* check that printf() results fit in buffer */
+ if (len == 0 || (unsigned)len >= state->size || next[state->size - 1] != 0)
+ return 0;
+
+ /* update buffer and position, compress first half if past that */
+ strm->avail_in += (unsigned)len;
+ state->x.pos += len;
+ if (strm->avail_in >= state->size) {
+ left = strm->avail_in - state->size;
+ strm->avail_in = state->size;
+ if (gz_comp(state, Z_NO_FLUSH) == -1)
+ return state->err;
+ memmove(state->in, state->in + state->size, left);
+ strm->next_in = state->in;
+ strm->avail_in = left;
+ }
+ return len;
+}
+
+z_int32_t Z_EXPORTVA PREFIX(gzprintf)(gzFile file, const char *format, ...) {
+ va_list va;
+ int ret;
+
+ va_start(va, format);
+ ret = PREFIX(gzvprintf)(file, format, va);
+ va_end(va);
+ return ret;
+}
+
+/* -- see zlib.h -- */
+z_int32_t Z_EXPORT PREFIX(gzflush)(gzFile file, z_int32_t flush) {
+ gz_state *state;
+
+ /* get internal structure */
+ if (file == NULL)
+ return Z_STREAM_ERROR;
+ state = (gz_state *)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 state->err;
+ }
+
+ /* compress remaining data with requested flush */
+ (void)gz_comp(state, flush);
+ return state->err;
+}
+
+/* -- see zlib.h -- */
+z_int32_t Z_EXPORT PREFIX(gzsetparams)(gzFile file, z_int32_t level, z_int32_t strategy) {
+ gz_state *state;
+ PREFIX3(stream) *strm;
+
+ /* get internal structure */
+ if (file == NULL)
+ return Z_STREAM_ERROR;
+ state = (gz_state *)file;
+ strm = &(state->strm);
+
+ /* check that we're writing and that there's no error */
+ if (state->mode != GZ_WRITE || state->err != Z_OK || state->direct)
+ 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 state->err;
+ }
+
+ /* 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_BLOCK) == -1)
+ return state->err;
+ PREFIX(deflateParams)(strm, level, strategy);
+ }
+ state->level = level;
+ state->strategy = strategy;
+ return Z_OK;
+}
+
+/* -- see zlib.h -- */
+z_int32_t Z_EXPORT PREFIX(gzclose_w)(gzFile file) {
+ int ret = Z_OK;
+ gz_state *state;
+
+ /* get internal structure */
+ if (file == NULL)
+ return Z_STREAM_ERROR;
+ state = (gz_state *)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 (gz_comp(state, Z_FINISH) == -1)
+ ret = state->err;
+ if (state->size) {
+ if (!state->direct) {
+ (void)PREFIX(deflateEnd)(&(state->strm));
+ }
+ gz_buffer_free(state);
+ }
+ PREFIX(gz_error)(state, Z_OK, NULL);
+ free(state->path);
+ if (close(state->fd) == -1)
+ ret = Z_ERRNO;
+ gz_state_free(state);
+ return ret;
+}
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