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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef MAR_H__
+#define MAR_H__
+
+#include <assert.h> // for C11 static_assert
+#include <stdint.h>
+#include <stdio.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* We have a MAX_SIGNATURES limit so that an invalid MAR will never
+ * waste too much of either updater's or signmar's time.
+ * It is also used at various places internally and will affect memory usage.
+ * If you want to increase this value above 9 then you need to adjust parsing
+ * code in tool/mar.c.
+ */
+#define MAX_SIGNATURES 8
+static_assert(MAX_SIGNATURES <= 9, "too many signatures");
+
+struct ProductInformationBlock {
+ const char* MARChannelID;
+ const char* productVersion;
+};
+
+/**
+ * The MAR item data structure.
+ */
+typedef struct MarItem_ {
+ struct MarItem_* next; /* private field */
+ uint32_t offset; /* offset into archive */
+ uint32_t length; /* length of data in bytes */
+ uint32_t flags; /* contains file mode bits */
+ char name[1]; /* file path */
+} MarItem;
+
+/**
+ * File offset and length for tracking access of byte indexes
+ */
+typedef struct SeenIndex_ {
+ struct SeenIndex_* next; /* private field */
+ uint32_t offset; /* offset into archive */
+ uint32_t length; /* length of the data in bytes */
+} SeenIndex;
+
+#define TABLESIZE 256
+
+/**
+ * Mozilla ARchive (MAR) file data structure
+ */
+struct MarFile_ {
+ unsigned char* buffer; /* file buffer containing the entire MAR */
+ size_t data_len; /* byte count of the data in the buffer */
+ MarItem* item_table[TABLESIZE]; /* hash table of files in the archive */
+ SeenIndex* index_list; /* file indexes processed */
+ int item_table_is_valid; /* header and index validation flag */
+};
+
+typedef struct MarFile_ MarFile;
+
+/**
+ * Signature of callback function passed to mar_enum_items.
+ * @param mar The MAR file being visited.
+ * @param item The MAR item being visited.
+ * @param data The data parameter passed by the caller of mar_enum_items.
+ * @return A non-zero value to stop enumerating.
+ */
+typedef int (*MarItemCallback)(MarFile* mar, const MarItem* item, void* data);
+
+enum MarReadResult_ {
+ MAR_READ_SUCCESS,
+ MAR_IO_ERROR,
+ MAR_MEM_ERROR,
+ MAR_FILE_TOO_BIG_ERROR,
+};
+
+typedef enum MarReadResult_ MarReadResult;
+
+/**
+ * Open a MAR file for reading.
+ * @param path Specifies the path to the MAR file to open. This path must
+ * be compatible with fopen.
+ * @param out_mar Out-parameter through which the created MarFile structure is
+ * returned. Guaranteed to be a valid structure if
+ * MAR_READ_SUCCESS is returned. Otherwise NULL will be
+ * assigned.
+ * @return NULL if an error occurs.
+ */
+MarReadResult mar_open(const char* path, MarFile** out_mar);
+
+#ifdef XP_WIN
+MarReadResult mar_wopen(const wchar_t* path, MarFile** out_mar);
+#endif
+
+/**
+ * Close a MAR file that was opened using mar_open.
+ * @param mar The MarFile object to close.
+ */
+void mar_close(MarFile* mar);
+
+/**
+ * Reads the specified amount of data from the buffer in MarFile that contains
+ * the entirety of the MAR file data.
+ * @param mar The MAR file to read from.
+ * @param dest The buffer to read into.
+ * @param position The byte index to start reading from the MAR at.
+ * On success, position will be incremented by size.
+ * @param size The number of bytes to read.
+ * @return 0 If the specified amount of data was read.
+ * -1 If the buffer MAR is not large enough to read the
+ * specified amount of data at the specified position.
+ */
+int mar_read_buffer(MarFile* mar, void* dest, size_t* position, size_t size);
+
+/**
+ * Reads the specified amount of data from the buffer in MarFile that contains
+ * the entirety of the MAR file data. If there isn't that much data remaining,
+ * reads as much as possible.
+ * @param mar The MAR file to read from.
+ * @param dest The buffer to read into.
+ * @param position The byte index to start reading from the MAR at.
+ * This function will increment position by the number of bytes
+ * copied.
+ * @param size The maximum number of bytes to read.
+ * @return The number of bytes copied into dest.
+ */
+int mar_read_buffer_max(MarFile* mar, void* dest, size_t* position,
+ size_t size);
+
+/**
+ * Increments position by distance. Checks that the resulting position is still
+ * within the bounds of the buffer. Much like fseek, this will allow position to
+ * be successfully placed just after the end of the buffer.
+ * @param mar The MAR file to read from.
+ * @param position The byte index to start reading from the MAR at.
+ * On success, position will be incremented by size.
+ * @param distance The number of bytes to move forward by.
+ * @return 0 If position was successfully moved.
+ * -1 If moving position by distance would move it outside the
+ * bounds of the buffer.
+ */
+int mar_buffer_seek(MarFile* mar, size_t* position, size_t distance);
+
+/**
+ * Find an item in the MAR file by name.
+ * @param mar The MarFile object to query.
+ * @param item The name of the item to query.
+ * @return A const reference to a MAR item or NULL if not found.
+ */
+const MarItem* mar_find_item(MarFile* mar, const char* item);
+
+/**
+ * Enumerate all MAR items via callback function.
+ * @param mar The MAR file to enumerate.
+ * @param callback The function to call for each MAR item.
+ * @param data A caller specified value that is passed along to the
+ * callback function.
+ * @return 0 if the enumeration ran to completion. Otherwise, any
+ * non-zero return value from the callback is returned.
+ */
+int mar_enum_items(MarFile* mar, MarItemCallback callback, void* data);
+
+/**
+ * Read from MAR item at given offset up to bufsize bytes.
+ * @param mar The MAR file to read.
+ * @param item The MAR item to read.
+ * @param offset The byte offset relative to the start of the item.
+ * @param buf A pointer to a buffer to copy the data into.
+ * @param bufsize The length of the buffer to copy the data into.
+ * @return The number of bytes written or a negative value if an
+ * error occurs.
+ */
+int mar_read(MarFile* mar, const MarItem* item, int offset, uint8_t* buf,
+ int bufsize);
+
+/**
+ * Create a MAR file from a set of files.
+ * @param dest The path to the file to create. This path must be
+ * compatible with fopen.
+ * @param numfiles The number of files to store in the archive.
+ * @param files The list of null-terminated file paths. Each file
+ * path must be compatible with fopen.
+ * @param infoBlock The information to store in the product information block.
+ * @return A non-zero value if an error occurs.
+ */
+int mar_create(const char* dest, int numfiles, char** files,
+ struct ProductInformationBlock* infoBlock);
+
+/**
+ * Extract a MAR file to the current working directory.
+ * @param path The path to the MAR file to extract. This path must be
+ * compatible with fopen.
+ * @return A non-zero value if an error occurs.
+ */
+int mar_extract(const char* path);
+
+#define MAR_MAX_CERT_SIZE (16 * 1024) // Way larger than necessary
+
+/* Read the entire file (not a MAR file) into a newly-allocated buffer.
+ * This function does not write to stderr. Instead, the caller should
+ * write whatever error messages it sees fit. The caller must free the returned
+ * buffer using free().
+ *
+ * @param filePath The path to the file that should be read.
+ * @param maxSize The maximum valid file size.
+ * @param data On success, *data will point to a newly-allocated buffer
+ * with the file's contents in it.
+ * @param size On success, *size will be the size of the created buffer.
+ *
+ * @return 0 on success, -1 on error
+ */
+int mar_read_entire_file(const char* filePath, uint32_t maxSize,
+ /*out*/ const uint8_t** data,
+ /*out*/ uint32_t* size);
+
+/**
+ * Verifies a MAR file by verifying each signature with the corresponding
+ * certificate. That is, the first signature will be verified using the first
+ * certificate given, the second signature will be verified using the second
+ * certificate given, etc. The signature count must exactly match the number of
+ * certificates given, and all signature verifications must succeed.
+ * We do not check that the certificate was issued by any trusted authority.
+ * We assume it to be self-signed. We do not check whether the certificate
+ * is valid for this usage.
+ *
+ * @param mar The already opened MAR file.
+ * @param certData Pointer to the first element in an array of certificate
+ * file data.
+ * @param certDataSizes Pointer to the first element in an array for size of
+ * the cert data.
+ * @param certCount The number of elements in certData and certDataSizes
+ * @return 0 on success
+ * a negative number if there was an error
+ * a positive number if the signature does not verify
+ */
+int mar_verify_signatures(MarFile* mar, const uint8_t* const* certData,
+ const uint32_t* certDataSizes, uint32_t certCount);
+
+/**
+ * Reads the product info block from the MAR file's additional block section.
+ * The caller is responsible for freeing the fields in infoBlock
+ * if the return is successful.
+ *
+ * @param infoBlock Out parameter for where to store the result to
+ * @return 0 on success, -1 on failure
+ */
+int mar_read_product_info_block(MarFile* mar,
+ struct ProductInformationBlock* infoBlock);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* MAR_H__ */