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1 #include <stdio.h>
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2 #include <fcntl.h>
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3 #include <unistd.h>
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4 #include <errno.h>
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5 #include <stdlib.h>
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6 #include <string.h>
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7 #include "razf.h"
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8
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9 #define WINDOW_SIZE 4096
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10
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11 static int razf_main_usage()
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12 {
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13 printf("\n");
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14 printf("Usage: razip [options] [file] ...\n\n");
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15 printf("Options: -c write on standard output, keep original files unchanged\n");
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16 printf(" -d decompress\n");
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17 printf(" -l list compressed file contents\n");
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18 printf(" -b INT decompress at INT position in the uncompressed file\n");
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19 printf(" -s INT decompress INT bytes in the uncompressed file\n");
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20 printf(" -h give this help\n");
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21 printf("\n");
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22 return 0;
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23 }
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24
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25 static int write_open(const char *fn, int is_forced)
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26 {
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27 int fd = -1;
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28 char c;
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29 if (!is_forced) {
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30 if ((fd = open(fn, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0666)) < 0 && errno == EEXIST) {
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31 printf("razip: %s already exists; do you wish to overwrite (y or n)? ", fn);
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32 scanf("%c", &c);
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33 if (c != 'Y' && c != 'y') {
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34 printf("razip: not overwritten\n");
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35 exit(1);
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36 }
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37 }
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38 }
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39 if (fd < 0) {
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40 if ((fd = open(fn, O_WRONLY | O_CREAT | O_TRUNC, 0666)) < 0) {
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41 fprintf(stderr, "razip: %s: Fail to write\n", fn);
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42 exit(1);
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43 }
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44 }
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45 return fd;
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46 }
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47
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48 int main(int argc, char **argv)
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49 {
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50 int c, compress, pstdout, is_forced;
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51 RAZF *rz;
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52 void *buffer;
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53 long start, end, size;
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54
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55 compress = 1; pstdout = 0; start = 0; size = -1; end = -1; is_forced = 0;
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56 while((c = getopt(argc, argv, "cdlhfb:s:")) >= 0){
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57 switch(c){
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58 case 'h': return razf_main_usage();
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59 case 'd': compress = 0; break;
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60 case 'c': pstdout = 1; break;
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61 case 'l': compress = 2; break;
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62 case 'b': start = atol(optarg); break;
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63 case 's': size = atol(optarg); break;
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64 case 'f': is_forced = 1; break;
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65 }
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66 }
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67 if (size >= 0) end = start + size;
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68 if(end >= 0 && end < start){
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69 fprintf(stderr, " -- Illegal region: [%ld, %ld] --\n", start, end);
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70 return 1;
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71 }
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72 if(compress == 1){
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73 int f_src, f_dst = -1;
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74 if(argc > optind){
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75 if((f_src = open(argv[optind], O_RDONLY)) < 0){
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76 fprintf(stderr, " -- Cannot open file: %s --\n", argv[optind]);
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77 return 1;
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78 }
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79 if(pstdout){
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80 f_dst = fileno(stdout);
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81 } else {
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82 char *name = malloc(sizeof(strlen(argv[optind]) + 5));
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83 strcpy(name, argv[optind]);
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84 strcat(name, ".rz");
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85 f_dst = write_open(name, is_forced);
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86 if (f_dst < 0) return 1;
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87 free(name);
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88 }
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89 } else if(pstdout){
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90 f_src = fileno(stdin);
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91 f_dst = fileno(stdout);
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92 } else return razf_main_usage();
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93 rz = razf_dopen(f_dst, "w");
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94 buffer = malloc(WINDOW_SIZE);
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95 while((c = read(f_src, buffer, WINDOW_SIZE)) > 0) razf_write(rz, buffer, c);
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96 razf_close(rz); // f_dst will be closed here
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97 if (argc > optind && !pstdout) unlink(argv[optind]);
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98 free(buffer);
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99 close(f_src);
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100 return 0;
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101 } else {
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102 if(argc <= optind) return razf_main_usage();
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103 if(compress == 2){
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104 rz = razf_open(argv[optind], "r");
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105 if(rz->file_type == FILE_TYPE_RZ) {
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106 printf("%20s%20s%7s %s\n", "compressed", "uncompressed", "ratio", "name");
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107 printf("%20lld%20lld%6.1f%% %s\n", (long long)rz->end, (long long)rz->src_end, rz->end * 100.0f / rz->src_end,
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108 argv[optind]);
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109 } else fprintf(stdout, "%s is not a regular rz file\n", argv[optind]);
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110 } else {
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111 int f_dst;
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112 if (argc > optind && !pstdout) {
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113 char *name;
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114 if (strstr(argv[optind], ".rz") - argv[optind] != strlen(argv[optind]) - 3) {
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115 printf("razip: %s: unknown suffix -- ignored\n", argv[optind]);
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116 return 1;
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117 }
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118 name = strdup(argv[optind]);
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119 name[strlen(name) - 3] = '\0';
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120 f_dst = write_open(name, is_forced);
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121 free(name);
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122 } else f_dst = fileno(stdout);
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123 rz = razf_open(argv[optind], "r");
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124 buffer = malloc(WINDOW_SIZE);
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125 razf_seek(rz, start, SEEK_SET);
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126 while(1){
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127 if(end < 0) c = razf_read(rz, buffer, WINDOW_SIZE);
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128 else c = razf_read(rz, buffer, (end - start > WINDOW_SIZE)? WINDOW_SIZE:(end - start));
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129 if(c <= 0) break;
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130 start += c;
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131 write(f_dst, buffer, c);
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132 if(end >= 0 && start >= end) break;
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133 }
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134 free(buffer);
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135 if (!pstdout) unlink(argv[optind]);
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136 }
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137 razf_close(rz);
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138 return 0;
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139 }
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140 }
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141
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