Mercurial > hg > dmlib
view src/dmpack.c @ 1785:86d10d5d4915
Fix case where DMGrowBuf is growing backwards and needs to be reallocated in
dmGrowBufRealloc() and the data is moved to the "end" of the newly grown
buffer. Previously we used clrsize as data size, but that is (in retrospect)
obviously incorrect. Use old buffer size instead.
author | Matti Hamalainen <ccr@tnsp.org> |
---|---|
date | Wed, 13 Jun 2018 01:39:06 +0300 |
parents | 132706e3b94b |
children | 9aa51ac4e502 |
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/* * DMLib * -- PACK-file handling * Programmed and designed by Matti 'ccr' Hamalainen * (C) Copyright 2011-2015 Tecnic Software productions (TNSP) */ #include "dmpack.h" #include "dmfile.h" DMPackEntry *dmPackEntryNew() { return (DMPackEntry *) dmMalloc0(sizeof(DMPackEntry)); } void dmPackEntryFree(DMPackEntry * node) { dmFree(node); } void dmPackEntryInsert(DMPackEntry ** packDir, DMPackEntry * node) { if (*packDir != NULL) { node->prev = (*packDir)->prev; (*packDir)->prev->next = node; (*packDir)->prev = node; } else { *packDir = node->prev = node; } node->next = NULL; } void dmPackEntryDelete(DMPackEntry ** packDir, DMPackEntry * node) { if (node->prev) node->prev->next = node->next; if (node->next) node->next->prev = node->prev; else (*packDir)->prev = node->prev; node->prev = node->next = NULL; } DMPackEntry *dmPackFind(DMPackEntry *list, const char *filename) { DMPackEntry *node; for (node = list; node != NULL; node = node->next) { if (strcmp(node->filename, filename) == 0) return node; } return NULL; } /* * OPEN a packfile */ int dmPackOpen(const char *filename, DMPackFile ** ppPack, BOOL readOnly) { unsigned int i; DMPackFile *pack = NULL; DMPackFileHeader hdr; int ret = DMERR_OK; // Allocate packfile-structure if ((pack = dmMalloc0(sizeof(DMPackFile))) == NULL) { ret = dmErrorDBG(DMERR_MALLOC, "Failed to allocate memory for PACK file structure '%s'.\n", filename); goto out; } // Open the file if ((pack->file = fopen(filename, readOnly ? "rb" : "r+b")) == NULL) { ret = dmError(dmGetErrno(), "Failed to open PACK file '%s'.\n", filename); goto out; } pack->filename = dm_strdup(filename); // Read PACK header if (fseeko(pack->file, 0L, SEEK_SET) != 0) { ret = dmErrorDBG(dmGetErrno(), "Failed to seek to file start '%s'.\n", filename); goto out; } if (!dm_fread_str(pack->file, (Uint8 *) &hdr.ident, sizeof(hdr.ident)) || !dm_fread_le16(pack->file, &hdr.version) || !dm_fread_le32(pack->file, &hdr.dirEntries) || !dm_fread_le64(pack->file, &hdr.dirOffset)) { ret = dmErrorDBG(DMERR_FREAD, "Error reading PACK file header data.\n"); goto out; } // Check information if (memcmp(&hdr.ident, DPACK_IDENT, sizeof(hdr.ident)) != 0) { ret = DMERR_NOTPACK; goto out; } if (hdr.version != DPACK_VERSION) { ret = DMERR_PACK_VERSION; goto out; } // Read directory if (hdr.dirOffset < sizeof(hdr) || fseeko(pack->file, hdr.dirOffset, SEEK_SET) != 0) { ret = dmErrorDBG(DMERR_INVALID, "Error seeking to PACK file '%s' directory offset.\n", filename); goto out; } for (i = 0; i < hdr.dirEntries; i++) { // Allocate and read directory entry DMPackEntry *entry; if ((entry = dmPackEntryNew()) == NULL) { ret = DMERR_MALLOC; goto out; } if (!dm_fread_str(pack->file, (Uint8 *) &entry->filename, DMRES_NAME_LEN) || !dm_fread_le64(pack->file, &entry->offset) || !dm_fread_le32(pack->file, &entry->length) || !dm_fread_le32(pack->file, &entry->size) || !dm_fread_le32(pack->file, &entry->flags)) { ret = DMERR_FREAD; goto out; } // Ensure that the filename ends in NUL entry->filename[DMRES_NAME_LEN] = 0; // Validate if (entry->size == 0 || entry->length == 0 || entry->length > hdr.dirOffset || entry->offset > hdr.dirOffset || strlen(entry->filename) == 0) { ret = DMERR_INVALID; goto out; } // Insert into list dmPackEntryInsert(&pack->entries, entry); } out: if (ret != DMERR_OK) { dmPackClose(pack); pack = NULL; } *ppPack = pack; return ret; } /* * CLOSE the packfile */ int dmPackClose(DMPackFile * pack) { DMPackEntry *node; if (pack == NULL) return DMERR_OK; // Write the directory node = pack->entries; while (node != NULL) { DMPackEntry *next = node->next; dmPackEntryFree(node); node = next; } // Close the file if (pack->file != NULL) fclose(pack->file); // Free structures dmFree(pack->filename); // Free packfile dmMemset(pack, 0, sizeof(DMPackFile)); dmFree(pack); return DMERR_OK; }