annotate zip.c @ 2243:0d1d5dccdd28

Initial implementation of oscilloscope debug view
author Michael Pavone <pavone@retrodev.com>
date Tue, 22 Nov 2022 17:57:02 -0800
parents 137dbd05ceab
children 0111c8344477
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <stddef.h>
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4 #include <string.h>
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5 #include "util.h"
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6 #include "zip.h"
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7 #ifndef DISABLE_ZLIB
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8 #include "zlib/zlib.h"
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9 #endif
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10
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11 static const char cdfd_magic[4] = {'P', 'K', 1, 2};
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12 static const char eocd_magic[4] = {'P', 'K', 5, 6};
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13 #define MIN_EOCD_SIZE 22
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14 #define MIN_CDFD_SIZE 46
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15 #define ZIP_MAX_EOCD_OFFSET (64*1024+MIN_EOCD_SIZE)
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16
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17 enum {
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18 ZIP_STORE = 0,
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19 ZIP_DEFLATE = 8
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20 };
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21
1581
7121daaa48c2 Fix drag and drop when using Nuklear UI
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22 zip_file *zip_open(const char *filename)
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23 {
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24 FILE *f = fopen(filename, "rb");
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25 if (!f) {
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26 return NULL;
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27 }
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28 long fsize = file_size(f);
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29 if (fsize < MIN_EOCD_SIZE) {
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30 //too small to be a zip file
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31 goto fail;
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32 }
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33
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34 long max_offset = fsize > ZIP_MAX_EOCD_OFFSET ? ZIP_MAX_EOCD_OFFSET : fsize;
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35 fseek(f, -max_offset, SEEK_END);
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36 uint8_t *buf = malloc(max_offset);
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37 if (max_offset != fread(buf, 1, max_offset, f)) {
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38 goto fail;
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39 }
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40
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41 long current_offset;
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42 uint32_t cd_start, cd_size;
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43 uint16_t cd_count;
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44 for (current_offset = max_offset - MIN_EOCD_SIZE; current_offset >= 0; current_offset--)
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45 {
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46 if (memcmp(eocd_magic, buf + current_offset, sizeof(eocd_magic))) {
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47 continue;
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48 }
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49 uint16_t comment_size = buf[current_offset + 20] | buf[current_offset + 21] << 8;
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50 if (comment_size != (max_offset - current_offset - MIN_EOCD_SIZE)) {
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51 continue;
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52 }
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53 cd_start = buf[current_offset + 16] | buf[current_offset + 17] << 8
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54 | buf[current_offset + 18] << 16 | buf[current_offset + 19] << 24;
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55 if (cd_start > (fsize - (max_offset - current_offset))) {
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56 continue;
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57 }
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58 cd_size = buf[current_offset + 12] | buf[current_offset + 13] << 8
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59 | buf[current_offset + 14] << 16 | buf[current_offset + 15] << 24;
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60 if ((cd_start + cd_size) > (fsize - (max_offset - current_offset))) {
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61 continue;
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62 }
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63 cd_count = buf[current_offset + 10] | buf[current_offset + 11] << 8;
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64 break;
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65 }
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66 free(buf);
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67 if (current_offset < 0) {
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68 //failed to find EOCD
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69 goto fail;
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70 }
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71 buf = malloc(cd_size);
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72 fseek(f, cd_start, SEEK_SET);
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73 if (cd_size != fread(buf, 1, cd_size, f)) {
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74 goto fail_free;
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75 }
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76 zip_entry *entries = calloc(cd_count, sizeof(zip_entry));
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77 uint32_t cd_max_last = cd_size - MIN_CDFD_SIZE;
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78 zip_entry *cur_entry = entries;
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79 for (uint32_t off = 0; cd_count && off <= cd_max_last; cur_entry++, cd_count--)
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80 {
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81 if (memcmp(buf + off, cdfd_magic, sizeof(cdfd_magic))) {
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82 goto fail_entries;
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83 }
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84 uint32_t name_length = buf[off + 28] | buf[off + 29] << 8;
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85 uint32_t extra_length = buf[off + 30] | buf[off + 31] << 8;
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86 //TODO: verify name length doesn't go past end of CD
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87
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88 cur_entry->name = malloc(name_length + 1);
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89 memcpy(cur_entry->name, buf + off + MIN_CDFD_SIZE, name_length);
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90 cur_entry->name[name_length] = 0;
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91
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92 cur_entry->compressed_size = buf[off + 20] | buf[off + 21] << 8
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93 | buf[off + 22] << 16 | buf[off + 23] << 24;
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94 cur_entry->size = buf[off + 24] | buf[off + 25] << 8
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95 | buf[off + 26] << 16 | buf[off + 27] << 24;
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96
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97 cur_entry->local_header_off = buf[off + 42] | buf[off + 43] << 8
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98 | buf[off + 44] << 16 | buf[off + 45] << 24;
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99
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100 cur_entry->compression_method = buf[off + 10] | buf[off + 11] << 8;
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101
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102 off += name_length + extra_length + MIN_CDFD_SIZE;
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103 }
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104
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105 zip_file *z = malloc(sizeof(zip_file));
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106 z->entries = entries;
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107 z->file = f;
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108 z->num_entries = cur_entry - entries;
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109 return z;
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110
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111 fail_entries:
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112 for (cur_entry--; cur_entry >= entries; cur_entry--)
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113 {
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114 free(cur_entry->name);
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115 }
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116 free(entries);
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117 fail_free:
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118 free(buf);
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119 fail:
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120 fclose(f);
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121 return NULL;
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122 }
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123
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124 uint8_t *zip_read(zip_file *f, uint32_t index, size_t *out_size)
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125 {
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126
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127 fseek(f->file, f->entries[index].local_header_off + 26, SEEK_SET);
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128 uint8_t tmp[4];
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129 if (sizeof(tmp) != fread(tmp, 1, sizeof(tmp), f->file)) {
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130 return NULL;
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131 }
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132 uint32_t local_variable = (tmp[0] | tmp[1] << 8) + (tmp[2] | tmp[3] << 8);
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133 fseek(f->file, f->entries[index].local_header_off + local_variable + 30, SEEK_SET);
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134
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135 size_t int_size;
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136 if (!out_size) {
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137 out_size = &int_size;
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138 int_size = f->entries[index].size;
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139 }
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140
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141 uint8_t *buf = malloc(*out_size);
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142 if (*out_size > f->entries[index].size) {
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143 *out_size = f->entries[index].size;
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144 }
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145 switch(f->entries[index].compression_method)
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146 {
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147 case ZIP_STORE:
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148 if (*out_size != fread(buf, 1, *out_size, f->file)) {
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149 free(buf);
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150 return NULL;
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151 }
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152 break;
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153 #ifndef DISABLE_ZLIB
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154 case ZIP_DEFLATE: {
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155 //note in unzip.c in zlib/contrib suggests a dummy byte is needed, so we allocate an extra byte here
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156 uint8_t *src_buf = malloc(f->entries[index].compressed_size + 1);
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157 if (f->entries[index].compressed_size != fread(src_buf, 1, f->entries[index].compressed_size, f->file)) {
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158 free(src_buf);
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159 return NULL;
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160 }
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161 uLongf destLen = *out_size;
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162 z_stream stream;
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163 memset(&stream, 0, sizeof(stream));
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164 stream.avail_in = f->entries[index].compressed_size + 1;
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165 stream.next_in = src_buf;
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166 stream.next_out = buf;
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167 stream.avail_out = *out_size;
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168 if (Z_OK == inflateInit2(&stream, -15)) {
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169 int result = inflate(&stream, Z_FINISH);
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170 *out_size = stream.total_out;
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171 free(src_buf);
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172 inflateEnd(&stream);
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173 if (result != Z_OK && result != Z_STREAM_END && result != Z_BUF_ERROR) {
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174 free(buf);
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175 return NULL;
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176 }
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177 }
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178 break;
1594
137dbd05ceab Fix some issues identified by cppcheck
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179 }
1531
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180 #endif
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181 default:
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182 free(buf);
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183 return NULL;
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184 }
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185
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186 return buf;
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187 }
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188
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189 void zip_close(zip_file *f)
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190 {
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191 fclose(f->file);
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192 for (uint32_t i = 0; i < f->num_entries; i++)
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193 {
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194 free(f->entries[i].name);
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195 }
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196 free(f->entries);
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197 free(f);
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198 }
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199
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200