skip file format
This commit is contained in:
DaniTheSkunk
parent
732acde1e6
commit
bf7b89c05a
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/******************************************************************************/
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/* Skip File Format, skunkworks zip */
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/* */
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/* little-endian */
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/* */
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/* Main Header: */
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/* */
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/* bytes | what */
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/* ------+------------------------------------------------------------------- */
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/* 4 | 'SWZP' */
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/* 1 | version, currently 0x00 */
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/* 1 | compression format, currently only 0 supported, uncompressed */
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/* 4 | size of uncompressed data chunk */
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/* 4 | size of compressed data chunk (same as compressed if format 0) */
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/* 2 | file count */
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/* */
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/* File Header (appears 'file count' times in a row): */
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/* */
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/* bytes | what */
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/* ------+------------------------------------------------------------------- */
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/* 4 | offset from beginning of data chunk */
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/* 4 | file size (uncompressed) */
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/* 1 | length of filename */
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/* * | filename (not zero terminated) */
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/* */
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/* Rest of File: */
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/* */
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/* bytes | what */
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/* ------+------------------------------------------------------------------- */
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/* * | data chunk */
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/* 4 | length of file total (to easily find header if file is attached to */
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/* an executable) */
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/******************************************************************************/
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#ifndef GUARD_62F584E45B48B8F6069643FC44702ED5
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#define GUARD_62F584E45B48B8F6069643FC44702ED5
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#include "types.h"
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struct sw_skip {
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u32 data_size;
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u8 *data;
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u16 file_count;
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struct {
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u32 offset;
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u32 size;
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char *name;
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} *files;
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};
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struct sw_skip *sw_skip_create();
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struct sw_skip *sw_skip_load(char *filename);
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void sw_skip_destroy(struct sw_skip *skip);
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void sw_skip_save(struct sw_skip *skip, char *filename);
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#endif /* GUARD_62F584E45B48B8F6069643FC44702ED5 */
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@ -0,0 +1,104 @@
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#include "skip.h"
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#include "error.h"
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#include "file.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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struct sw_skip *sw_skip_create() {
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struct sw_skip *skip;
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skip = calloc(1, sizeof(struct sw_skip));
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return skip;
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}
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struct sw_skip *sw_skip_load(char *filename) {
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FILE *fil;
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struct sw_skip *skip;
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char magic[5] = {0};
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u8 version, compression;
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u16 i;
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char str[257];
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u8 str_len;
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skip = sw_skip_create();
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fil = fopen(filename, "rb");
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fread(magic, 1, 4, fil);
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if(strcmp("SWZP", magic) != 0) {
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sw_error("not a .skip file");
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}
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fread(&version, 1, 1, fil);
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if(version > 0) {
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sw_error("version %i of .skip not supported", version);
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}
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fread(&compression, 1, 1, fil);
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if(compression > 0) {
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sw_error("unsupported .skip compression method");
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}
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fread(&skip->data_size, 1, 4, fil);
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fseek(fil, 4, SEEK_CUR); /* ignore compressed size */
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fread(&skip->file_count, 1, 2, fil);
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skip->files = malloc(sizeof(skip->files[0]) * skip->file_count);
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for(i = 0; i < skip->file_count; ++i) {
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memset(str, 0, 257);
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fread(&skip->files[i].offset, 1, 4, fil);
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fread(&skip->files[i].size, 1, 4, fil);
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fread(&str_len, 1, 1, fil);
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fread(str, str_len, 1, fil);
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str[str_len] = 0;
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skip->files[i].name = malloc(str_len + 1);
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strcpy(skip->files[i].name, str);
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}
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fclose(fil);
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return skip;
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}
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void sw_skip_destroy(struct sw_skip *skip) {
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i32 i;
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for(i = 0; i < skip->file_count; ++i) {
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free(skip->files[i].name);
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}
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free(skip->files);
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free(skip->data);
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free(skip);
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}
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void sw_skip_save(struct sw_skip *skip, char *filename) {
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FILE *fil;
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u32 size;
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u16 i;
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size = 0;
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for(i = 0; i < skip->file_count; ++i) {
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size += skip->files[i].size;
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}
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fil = fopen(filename, "wb");
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sw_fwrite_str_nozero(fil, "SWZP");
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sw_fwrite_u8(fil, 0); /* version */
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sw_fwrite_u8(fil, 0); /* compression */
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sw_fwrite_u32(fil, size); /* uncompressed size */
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sw_fwrite_u32(fil, size); /* compressed size */
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sw_fwrite_u16(fil, skip->file_count); /* file count */
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for(i = 0; i < skip->file_count; ++i) {
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sw_fwrite_u32(fil, skip->files[i].offset); /* offset */
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sw_fwrite_u32(fil, skip->files[i].size); /* file size */
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sw_fwrite_str_prefix8(fil, skip->files[i].name); /* file name */
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}
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sw_fwrite_u32(fil, ftell(fil) + 4); /* file length */
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fclose(fil);
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}
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