diff options
Diffstat (limited to 'Utilities/cmlibarchive/libarchive/archive_write_add_filter_gzip.c')
-rw-r--r-- | Utilities/cmlibarchive/libarchive/archive_write_add_filter_gzip.c | 442 |
1 files changed, 442 insertions, 0 deletions
diff --git a/Utilities/cmlibarchive/libarchive/archive_write_add_filter_gzip.c b/Utilities/cmlibarchive/libarchive/archive_write_add_filter_gzip.c new file mode 100644 index 0000000000..3e26605ec1 --- /dev/null +++ b/Utilities/cmlibarchive/libarchive/archive_write_add_filter_gzip.c @@ -0,0 +1,442 @@ +/*- + * Copyright (c) 2003-2007 Tim Kientzle + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "archive_platform.h" + +__FBSDID("$FreeBSD: head/lib/libarchive/archive_write_set_compression_gzip.c 201081 2009-12-28 02:04:42Z kientzle $"); + +#ifdef HAVE_ERRNO_H +#include <errno.h> +#endif +#ifdef HAVE_STDLIB_H +#include <stdlib.h> +#endif +#ifdef HAVE_STRING_H +#include <string.h> +#endif +#include <time.h> +#ifdef HAVE_ZLIB_H +#include <cm3p/zlib.h> +#endif + +#include "archive.h" +#include "archive_private.h" +#include "archive_string.h" +#include "archive_write_private.h" + +#if ARCHIVE_VERSION_NUMBER < 4000000 +int +archive_write_set_compression_gzip(struct archive *a) +{ + __archive_write_filters_free(a); + return (archive_write_add_filter_gzip(a)); +} +#endif + +/* Don't compile this if we don't have zlib. */ + +struct private_data { + int compression_level; + int timestamp; +#ifdef HAVE_ZLIB_H + z_stream stream; + int64_t total_in; + unsigned char *compressed; + size_t compressed_buffer_size; + unsigned long crc; +#else + struct archive_write_program_data *pdata; +#endif +}; + +/* + * Yuck. zlib.h is not const-correct, so I need this one bit + * of ugly hackery to convert a const * pointer to a non-const pointer. + */ +#define SET_NEXT_IN(st,src) \ + (st)->stream.next_in = (Bytef *)(uintptr_t)(const void *)(src) + +static int archive_compressor_gzip_options(struct archive_write_filter *, + const char *, const char *); +static int archive_compressor_gzip_open(struct archive_write_filter *); +static int archive_compressor_gzip_write(struct archive_write_filter *, + const void *, size_t); +static int archive_compressor_gzip_close(struct archive_write_filter *); +static int archive_compressor_gzip_free(struct archive_write_filter *); +#ifdef HAVE_ZLIB_H +static int drive_compressor(struct archive_write_filter *, + struct private_data *, int finishing); +#endif + + +/* + * Add a gzip compression filter to this write handle. + */ +int +archive_write_add_filter_gzip(struct archive *_a) +{ + struct archive_write *a = (struct archive_write *)_a; + struct archive_write_filter *f = __archive_write_allocate_filter(_a); + struct private_data *data; + archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC, + ARCHIVE_STATE_NEW, "archive_write_add_filter_gzip"); + + data = calloc(1, sizeof(*data)); + if (data == NULL) { + archive_set_error(&a->archive, ENOMEM, "Out of memory"); + return (ARCHIVE_FATAL); + } + f->data = data; + f->open = &archive_compressor_gzip_open; + f->options = &archive_compressor_gzip_options; + f->close = &archive_compressor_gzip_close; + f->free = &archive_compressor_gzip_free; + f->code = ARCHIVE_FILTER_GZIP; + f->name = "gzip"; +#ifdef HAVE_ZLIB_H + data->compression_level = Z_DEFAULT_COMPRESSION; + return (ARCHIVE_OK); +#else + data->pdata = __archive_write_program_allocate("gzip"); + if (data->pdata == NULL) { + free(data); + archive_set_error(&a->archive, ENOMEM, "Out of memory"); + return (ARCHIVE_FATAL); + } + data->compression_level = 0; + archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, + "Using external gzip program"); + return (ARCHIVE_WARN); +#endif +} + +static int +archive_compressor_gzip_free(struct archive_write_filter *f) +{ + struct private_data *data = (struct private_data *)f->data; + +#ifdef HAVE_ZLIB_H + free(data->compressed); +#else + __archive_write_program_free(data->pdata); +#endif + free(data); + f->data = NULL; + return (ARCHIVE_OK); +} + +/* + * Set write options. + */ +static int +archive_compressor_gzip_options(struct archive_write_filter *f, const char *key, + const char *value) +{ + struct private_data *data = (struct private_data *)f->data; + + if (strcmp(key, "compression-level") == 0) { + if (value == NULL || !(value[0] >= '0' && value[0] <= '9') || + value[1] != '\0') + return (ARCHIVE_WARN); + data->compression_level = value[0] - '0'; + return (ARCHIVE_OK); + } + if (strcmp(key, "timestamp") == 0) { + data->timestamp = (value == NULL)?-1:1; + return (ARCHIVE_OK); + } + + /* Note: The "warn" return is just to inform the options + * supervisor that we didn't handle it. It will generate + * a suitable error if no one used this option. */ + return (ARCHIVE_WARN); +} + +#ifdef HAVE_ZLIB_H +/* + * Setup callback. + */ +static int +archive_compressor_gzip_open(struct archive_write_filter *f) +{ + struct private_data *data = (struct private_data *)f->data; + int ret; + + if (data->compressed == NULL) { + size_t bs = 65536, bpb; + if (f->archive->magic == ARCHIVE_WRITE_MAGIC) { + /* Buffer size should be a multiple number of + * the of bytes per block for performance. */ + bpb = archive_write_get_bytes_per_block(f->archive); + if (bpb > bs) + bs = bpb; + else if (bpb != 0) + bs -= bs % bpb; + } + data->compressed_buffer_size = bs; + data->compressed + = (unsigned char *)malloc(data->compressed_buffer_size); + if (data->compressed == NULL) { + archive_set_error(f->archive, ENOMEM, + "Can't allocate data for compression buffer"); + return (ARCHIVE_FATAL); + } + } + + data->crc = crc32(0L, NULL, 0); + data->stream.next_out = data->compressed; + data->stream.avail_out = (uInt)data->compressed_buffer_size; + + /* Prime output buffer with a gzip header. */ + data->compressed[0] = 0x1f; /* GZip signature bytes */ + data->compressed[1] = 0x8b; + data->compressed[2] = 0x08; /* "Deflate" compression */ + data->compressed[3] = 0; /* No options */ + if (data->timestamp >= 0) { + time_t t = time(NULL); + data->compressed[4] = (uint8_t)(t)&0xff; /* Timestamp */ + data->compressed[5] = (uint8_t)(t>>8)&0xff; + data->compressed[6] = (uint8_t)(t>>16)&0xff; + data->compressed[7] = (uint8_t)(t>>24)&0xff; + } else + memset(&data->compressed[4], 0, 4); + if (data->compression_level == 9) + data->compressed[8] = 2; + else if(data->compression_level == 1) + data->compressed[8] = 4; + else + data->compressed[8] = 0; + data->compressed[9] = 3; /* OS=Unix */ + data->stream.next_out += 10; + data->stream.avail_out -= 10; + + f->write = archive_compressor_gzip_write; + + /* Initialize compression library. */ + ret = deflateInit2(&(data->stream), + data->compression_level, + Z_DEFLATED, + -15 /* < 0 to suppress zlib header */, + 8, + Z_DEFAULT_STRATEGY); + + if (ret == Z_OK) { + f->data = data; + return (ARCHIVE_OK); + } + + /* Library setup failed: clean up. */ + archive_set_error(f->archive, ARCHIVE_ERRNO_MISC, "Internal error " + "initializing compression library"); + + /* Override the error message if we know what really went wrong. */ + switch (ret) { + case Z_STREAM_ERROR: + archive_set_error(f->archive, ARCHIVE_ERRNO_MISC, + "Internal error initializing " + "compression library: invalid setup parameter"); + break; + case Z_MEM_ERROR: + archive_set_error(f->archive, ENOMEM, + "Internal error initializing compression library"); + break; + case Z_VERSION_ERROR: + archive_set_error(f->archive, ARCHIVE_ERRNO_MISC, + "Internal error initializing " + "compression library: invalid library version"); + break; + } + + return (ARCHIVE_FATAL); +} + +/* + * Write data to the compressed stream. + */ +static int +archive_compressor_gzip_write(struct archive_write_filter *f, const void *buff, + size_t length) +{ + struct private_data *data = (struct private_data *)f->data; + int ret; + + /* Update statistics */ + data->crc = crc32(data->crc, (const Bytef *)buff, (uInt)length); + data->total_in += length; + + /* Compress input data to output buffer */ + SET_NEXT_IN(data, buff); + data->stream.avail_in = (uInt)length; + if ((ret = drive_compressor(f, data, 0)) != ARCHIVE_OK) + return (ret); + + return (ARCHIVE_OK); +} + +/* + * Finish the compression... + */ +static int +archive_compressor_gzip_close(struct archive_write_filter *f) +{ + unsigned char trailer[8]; + struct private_data *data = (struct private_data *)f->data; + int ret; + + /* Finish compression cycle */ + ret = drive_compressor(f, data, 1); + if (ret == ARCHIVE_OK) { + /* Write the last compressed data. */ + ret = __archive_write_filter(f->next_filter, + data->compressed, + data->compressed_buffer_size - data->stream.avail_out); + } + if (ret == ARCHIVE_OK) { + /* Build and write out 8-byte trailer. */ + trailer[0] = (uint8_t)(data->crc)&0xff; + trailer[1] = (uint8_t)(data->crc >> 8)&0xff; + trailer[2] = (uint8_t)(data->crc >> 16)&0xff; + trailer[3] = (uint8_t)(data->crc >> 24)&0xff; + trailer[4] = (uint8_t)(data->total_in)&0xff; + trailer[5] = (uint8_t)(data->total_in >> 8)&0xff; + trailer[6] = (uint8_t)(data->total_in >> 16)&0xff; + trailer[7] = (uint8_t)(data->total_in >> 24)&0xff; + ret = __archive_write_filter(f->next_filter, trailer, 8); + } + + switch (deflateEnd(&(data->stream))) { + case Z_OK: + break; + default: + archive_set_error(f->archive, ARCHIVE_ERRNO_MISC, + "Failed to clean up compressor"); + ret = ARCHIVE_FATAL; + } + return ret; +} + +/* + * Utility function to push input data through compressor, + * writing full output blocks as necessary. + * + * Note that this handles both the regular write case (finishing == + * false) and the end-of-archive case (finishing == true). + */ +static int +drive_compressor(struct archive_write_filter *f, + struct private_data *data, int finishing) +{ + int ret; + + for (;;) { + if (data->stream.avail_out == 0) { + ret = __archive_write_filter(f->next_filter, + data->compressed, + data->compressed_buffer_size); + if (ret != ARCHIVE_OK) + return (ARCHIVE_FATAL); + data->stream.next_out = data->compressed; + data->stream.avail_out = + (uInt)data->compressed_buffer_size; + } + + /* If there's nothing to do, we're done. */ + if (!finishing && data->stream.avail_in == 0) + return (ARCHIVE_OK); + + ret = deflate(&(data->stream), + finishing ? Z_FINISH : Z_NO_FLUSH ); + + switch (ret) { + case Z_OK: + /* In non-finishing case, check if compressor + * consumed everything */ + if (!finishing && data->stream.avail_in == 0) + return (ARCHIVE_OK); + /* In finishing case, this return always means + * there's more work */ + break; + case Z_STREAM_END: + /* This return can only occur in finishing case. */ + return (ARCHIVE_OK); + default: + /* Any other return value indicates an error. */ + archive_set_error(f->archive, ARCHIVE_ERRNO_MISC, + "GZip compression failed:" + " deflate() call returned status %d", + ret); + return (ARCHIVE_FATAL); + } + } +} + +#else /* HAVE_ZLIB_H */ + +static int +archive_compressor_gzip_open(struct archive_write_filter *f) +{ + struct private_data *data = (struct private_data *)f->data; + struct archive_string as; + int r; + + archive_string_init(&as); + archive_strcpy(&as, "gzip"); + + /* Specify compression level. */ + if (data->compression_level > 0) { + archive_strcat(&as, " -"); + archive_strappend_char(&as, '0' + data->compression_level); + } + if (data->timestamp < 0) + /* Do not save timestamp. */ + archive_strcat(&as, " -n"); + else if (data->timestamp > 0) + /* Save timestamp. */ + archive_strcat(&as, " -N"); + + f->write = archive_compressor_gzip_write; + r = __archive_write_program_open(f, data->pdata, as.s); + archive_string_free(&as); + return (r); +} + +static int +archive_compressor_gzip_write(struct archive_write_filter *f, const void *buff, + size_t length) +{ + struct private_data *data = (struct private_data *)f->data; + + return __archive_write_program_write(f, data->pdata, buff, length); +} + +static int +archive_compressor_gzip_close(struct archive_write_filter *f) +{ + struct private_data *data = (struct private_data *)f->data; + + return __archive_write_program_close(f, data->pdata); +} + +#endif /* HAVE_ZLIB_H */ |