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-rw-r--r--libbb/deb_extract.c96
1 files changed, 61 insertions, 35 deletions
diff --git a/libbb/deb_extract.c b/libbb/deb_extract.c
index 36cebfa51..f64193970 100644
--- a/libbb/deb_extract.c
+++ b/libbb/deb_extract.c
@@ -27,71 +27,97 @@
27#include <unistd.h> 27#include <unistd.h>
28#include <stdlib.h> 28#include <stdlib.h>
29#include <string.h> 29#include <string.h>
30#include <signal.h>
31#include "libbb.h" 30#include "libbb.h"
32 31
32int seek_sub_file(FILE *in_file, file_headers_t *headers, const char *tar_gz_file)
33{
34 /* find the headers for the specified .tar.gz file */
35 while (headers != NULL) {
36 if (strcmp(headers->name, tar_gz_file) == 0) {
37 fseek(in_file, headers->offset, SEEK_SET);
38 return(EXIT_SUCCESS);
39 }
40 headers = headers->next;
41 }
42
43 return(EXIT_FAILURE);
44}
45
33/* 46/*
34 * The contents of argument depend on the value of function. 47 * The contents of argument depend on the value of function.
35 * It is either a dir name or a control file or field name(see dpkg_deb.c) 48 * It is either a dir name or a control file or field name(see dpkg_deb.c)
36 */ 49 */
37extern char *deb_extract(const char *package_filename, const int function, const char *argument, const char *argument2) 50char *deb_extract(const char *package_filename, FILE *out_stream, const int extract_function,
51 const char *prefix, const char *filename)
38{ 52{
53 FILE *deb_stream, *uncompressed_stream;
54 file_headers_t *ar_headers = NULL;
55 file_headers_t *tar_headers = NULL;
56 file_headers_t *list_ptr;
57 file_headers_t *deb_extract_list = (file_headers_t *) calloc(1, sizeof(file_headers_t));
39 58
40 FILE *deb_file, *uncompressed_file;
41 ar_headers_t *headers = NULL;
42 char *ared_file = NULL; 59 char *ared_file = NULL;
43 char *output_buffer = NULL; 60 char *output_buffer = NULL;
44 int gunzip_pid; 61 int gunzip_pid;
45 62
46 switch (function) { 63 if (extract_function & extract_control_tar_gz) {
47 case (extract_info): 64 ared_file = xstrdup("control.tar.gz");
48 case (extract_control): 65 }
49 case (extract_field): 66 else if (extract_function & extract_data_tar_gz) {
50 ared_file = xstrdup("control.tar.gz"); 67 ared_file = xstrdup("data.tar.gz");
51 break;
52 default:
53 ared_file = xstrdup("data.tar.gz");
54 break;
55 } 68 }
56 69
57 /* open the debian package to be worked on */ 70 /* open the debian package to be worked on */
58 deb_file = wfopen(package_filename, "r"); 71 deb_stream = wfopen(package_filename, "r");
59 72
60 headers = (ar_headers_t *) xmalloc(sizeof(ar_headers_t)); 73 ar_headers = (file_headers_t *) xmalloc(sizeof(file_headers_t));
61 74
62 /* get a linked list of all ar entries */ 75 /* get a linked list of all ar entries */
63 if ((headers = get_ar_headers(deb_file)) == NULL) { 76 ar_headers = get_ar_headers(deb_stream);
77 if (ar_headers == NULL) {
64 error_msg("Couldnt get ar headers\n"); 78 error_msg("Couldnt get ar headers\n");
65 return(NULL); 79 return(NULL);
66 } 80 }
67 81
68 /* seek to the start of the .tar.gz file within the ar file*/ 82 /* seek to the start of the .tar.gz file within the ar file*/
69 if (seek_ared_file(deb_file, headers, ared_file) == EXIT_FAILURE) { 83 fseek(deb_stream, 0, SEEK_SET);
70 error_msg("Couldnt seek to ar file"); 84 if (seek_sub_file(deb_stream, ar_headers, ared_file) == EXIT_FAILURE) {
85 error_msg("Couldnt seek to file %s", ared_file);
71 } 86 }
72 87
73 /* open a stream of decompressed data */ 88 /* get a linked list of all tar entries */
74 uncompressed_file = fdopen(gz_open(deb_file, &gunzip_pid), "r"); 89 tar_headers = get_tar_gz_headers(deb_stream);
75 90 if (tar_headers == NULL) {
76 if (function & extract_fsys_tarfile) { 91 error_msg("Couldnt get tar headers\n");
77 copy_file_chunk(uncompressed_file, stdout, -1); 92 return(NULL);
78 } else { 93 }
79 FILE *output;
80 94
81 if (function & extract_contents_to_file) { 95 if (extract_function & extract_one_to_buffer) {
82 output = wfopen(argument, "w"); 96 list_ptr = tar_headers;
83 } else { 97 while (list_ptr != NULL) {
84 output = stdout; 98 if (strcmp(filename, list_ptr->name) == 0) {
99 deb_extract_list = append_archive_list(deb_extract_list, list_ptr);
100 break;
101 }
102 list_ptr = list_ptr->next;
85 } 103 }
104 } else {
105 deb_extract_list = tar_headers;
106 }
86 107
87 output_buffer = untar(uncompressed_file, output, function, argument, argument2); 108 /* seek to the start of the .tar.gz file within the ar file*/
88 if (output != stdout) { 109 if (seek_sub_file(deb_stream, ar_headers, ared_file) == EXIT_FAILURE) {
89 fclose(output); 110 error_msg("Couldnt seek to ar file");
90 }
91 } 111 }
112
113 /* open a stream of decompressed data */
114 uncompressed_stream = fdopen(gz_open(deb_stream, &gunzip_pid), "r");
115
116 output_buffer = extract_archive(uncompressed_stream, out_stream, deb_extract_list, extract_function, prefix);
117
92 gz_close(gunzip_pid); 118 gz_close(gunzip_pid);
93 fclose(deb_file); 119 fclose(deb_stream);
94 fclose(uncompressed_file); 120 fclose(uncompressed_stream);
95 free(ared_file); 121 free(ared_file);
96 122
97 return(output_buffer); 123 return(output_buffer);