{"header":{"message":"Add initial support for reading the offsets from a (fixed) change","description":null,"timestamp":"2022-08-12T20:38:39.155656653Z","authors":[{}]},"hash":"Q7TKZCJP2Z75EICZYKCEZDHKGERSOKZGMTSU3UXETBHTF663T66AC","authors":[{"login":"laumann","key":"26ibH2ZceFecUuiipNxtdzeLok5RbhVCUacPbXeugrNC"}],"deps":{"hashes":[["Q7TKZCJP2Z75EICZYKCEZDHKGERSOKZGMTSU3UXETBHTF663T66AC","Add initial support for reading the offsets from a (fixed) change"],["AA",null],["FB67XX5EGNF45JNAQISW7CBLSLS36F6JEUOBTTPUMVBMOVLGA3VQC","add argument parsing setup"],["PEUS54XQ5KJQYAVUYBG5MWLEHIOVPMZ3ANVC7HPQP6JUWWPRDW5AC",""],["B3XLVPNC4COLLC3FUE34Y7HIKTMF6CJZUASZOU3YM2YGPZKJZP7QC","Add ani.c and initial Makefile"]],"deps":["FB67XX5EGNF45JNAQISW7CBLSLS36F6JEUOBTTPUMVBMOVLGA3VQC"],"known":[]},"hunks":[{"Edit":{"inode":{"change":2,"pos":1044},"path":"commands.h","line":2,"atom":{"NewVertex":{"up_context":[{"change":2,"pos":1089}],"down_context":[],"flag":"BLOCK","start":0,"end":46,"inode":{"change":2,"pos":1044}}},"contents":[{"Add":"int cmd_change(int argc, const char *argv[]);"}]}},{"FileAdd":{"meta":{"basename":"change.h","metadata":0},"context":[{"change":4,"pos":1}],"contents":[{"Add":"#ifndef CHANGE_H"},{"Add":"#define CHANGE_H"},{"Add":""},{"Add":"/**"},{"Add":" * Required headers"},{"Add":" * * stdint.h"},{"Add":" */"},{"Add":""},{"Add":"#define CHANGE_VERSION 6"},{"Add":""},{"Add":"/**"},{"Add":" * A table of contents for a change, indicating where each section is, to allow"},{"Add":" * seeking inside a change file."},{"Add":" */"},{"Add":"struct offsets {"},{"Add":"\tuint64_t version;"},{"Add":"\tuint64_t hashed_len;\t/* length of hashed contents */"},{"Add":"\tuint64_t unhashed_off;"},{"Add":"\tuint64_t unhashed_len;\t/* length of unhashed contents */"},{"Add":"\tuint64_t contents_off;"},{"Add":"\tuint64_t contents_len;\t/* length of contents (uncompressed) */"},{"Add":"\tuint64_t total;\t\t/* contents_off + length(compressed contents) */"},{"Add":"};"},{"Add":""},{"Add":"/* sizeof(struct offsets) */"},{"Add":"#define OFFSETS_SIZE 56"},{"Add":""},{"Add":"/**"},{"Add":" * The possible errors that can arise when working with change files."},{"Add":" */"},{"Add":"enum change_err {"},{"Add":"\tVERMISMATCH = -1"},{"Add":"};"},{"Add":""},{"Add":"/**"},{"Add":" * Decode the 'struct offsets' from the given fd"},{"Add":" *"},{"Add":" * Return 0 if decoding completed successfully, a negative number indicates an"},{"Add":" * error."},{"Add":" */"},{"Add":"int decode_offsets(int fd, struct offsets *);"},{"Add":""},{"Add":"#endif"}]}},{"FileAdd":{"meta":{"basename":"change.c","metadata":0},"context":[{"change":4,"pos":1}],"contents":[{"Add":"#include "},{"Add":"#include \t/* read() */"},{"Add":"#include \t/* open() */"},{"Add":"#include "},{"Add":"#include "},{"Add":"#include "},{"Add":""},{"Add":"#include \"change.h\""},{"Add":""},{"Add":"/** Read a uint64_t from byte buffer as little endian */"},{"Add":"#define legetu64(buf) (((uint64_t)buf[7]) << 56 | (uint64_t)buf[6] << 48 | (uint64_t)buf[5] << 40 | (uint64_t)buf[4] << 32 | (uint64_t)buf[3] << 24 | (uint64_t)buf[2] << 16 | (uint64_t)buf[1] << 8 | (uint64_t)buf[0]);"},{"Add":""},{"Add":"int"},{"Add":"decode_offsets(int fd, struct offsets *off)"},{"Add":"{"},{"Add":"\t/* */"},{"Add":"\tssize_t r;"},{"Add":"\tuint8_t buf[OFFSETS_SIZE];"},{"Add":"\tuint8_t *bufp;"},{"Add":""},{"Add":"\tif ((r = read(fd, buf, OFFSETS_SIZE)) < OFFSETS_SIZE) {"},{"Add":"\t\tint err;"},{"Add":"\t\tif (r >= 0) {"},{"Add":"\t\t\tprintf(\"error: not enough was read: %ld\\n\", r);"},{"Add":"\t\t\terr = -2;"},{"Add":"\t\t} else {"},{"Add":"\t\t\tprintf(\"error: not enough was read: %ld\\n\", r);"},{"Add":"\t\t\terr = -1;"},{"Add":"\t\t}"},{"Add":"\t\treturn err;"},{"Add":"\t}"},{"Add":"\tbufp = (uint8_t *)buf;"},{"Add":"\toff->version = legetu64(bufp);"},{"Add":"\tbufp += 8;"},{"Add":"\toff->hashed_len = legetu64(bufp)"},{"Add":"\tbufp += 8;"},{"Add":"\toff->unhashed_off = legetu64(bufp)"},{"Add":"\tbufp += 8;"},{"Add":"\toff->unhashed_len = legetu64(bufp)"},{"Add":"\tbufp += 8;"},{"Add":"\toff->contents_off = legetu64(bufp)"},{"Add":"\tbufp += 8;"},{"Add":"\toff->contents_len = legetu64(bufp)"},{"Add":"\tbufp += 8;"},{"Add":"\toff->total = legetu64(bufp)"},{"Add":""},{"Add":"\treturn 0;"},{"Add":"}"},{"Add":""},{"Add":""},{"Add":"int"},{"Add":"change()"},{"Add":"{"},{"Add":"\tint fd;"},{"Add":"\tint err;"},{"Add":"\tstruct offsets off;"},{"Add":""},{"Add":"\t/* FIXME: A very fixed example */"},{"Add":"\tfd = open("},{"Add":"\t\t\".pijul/changes/AH/IXA5ZESN6QJXV2LKRSC4H5ZRFMJFHFPY2RQRARTH3XJLLCMCGQC.change\","},{"Add":"\t\tO_RDONLY"},{"Add":"\t);"},{"Add":"\tif (fd == -1) {"},{"Add":"\t\tprintf(\"error: %s\\n\", strerror(errno));"},{"Add":"\t\treturn -1;"},{"Add":"\t}"},{"Add":""},{"Add":"\terr = decode_offsets(fd, &off);"},{"Add":"\tif (err != 0) {"},{"Add":"\t\tprintf(\"error: failed to decode offsets\\n\");"},{"Add":"\t\tgoto out;"},{"Add":"\t}"},{"Add":"\tprintf(\"version : %lu\\n\", off.version);"},{"Add":"\tprintf(\"hashed_len : %lu\\n\", off.hashed_len);"},{"Add":"\tprintf(\"unhashed_off : %lu\\n\", off.unhashed_off);"},{"Add":"\tprintf(\"unhashed_len : %lu\\n\", off.unhashed_len);"},{"Add":"\tprintf(\"contents_off : %lu\\n\", off.contents_off);"},{"Add":"\tprintf(\"contents_len : %lu\\n\", off.contents_len);"},{"Add":"\tprintf(\"total : %lu\\n\", off.total);"},{"Add":""},{"Add":"out:"},{"Add":"\tclose(fd);"},{"Add":"\treturn err;"},{"Add":"}"},{"Add":""},{"Add":"int cmd_change(int argc, const char **argv)"},{"Add":"{"},{"Add":"\t/* FIXME: Add argument handling */"},{"Add":"\treturn change();"},{"Add":"}"}]}},{"Edit":{"inode":{"change":5,"pos":30},"path":"ani.c","line":12,"atom":{"NewVertex":{"up_context":[{"change":5,"pos":170}],"down_context":[{"change":5,"pos":170}],"flag":"BLOCK","start":3102,"end":3158,"inode":{"change":5,"pos":30}}},"contents":[{"Add":"\t\" change Show information about a particular change\\n\""}]}},{"Edit":{"inode":{"change":5,"pos":30},"path":"ani.c","line":15,"atom":{"NewVertex":{"up_context":[{"change":5,"pos":174}],"down_context":[{"change":2,"pos":1173}],"flag":"BLOCK","start":3159,"end":3226,"inode":{"change":5,"pos":30}}},"contents":[{"Add":"/* List of builtin commands, by name and the function to invoke */"}]}},{"Edit":{"inode":{"change":5,"pos":30},"path":"ani.c","line":23,"atom":{"NewVertex":{"up_context":[{"change":2,"pos":1297}],"down_context":[{"change":2,"pos":1297}],"flag":"BLOCK","start":3227,"end":3254,"inode":{"change":5,"pos":30}}},"contents":[{"Add":"\t{ \"change\", cmd_change },"}]}},{"Edit":{"inode":{"change":5,"pos":458},"path":"Makefile","line":13,"atom":{"NewVertex":{"up_context":[{"change":2,"pos":2019}],"down_context":[{"change":5,"pos":620}],"flag":"BLOCK","start":3255,"end":3272,"inode":{"change":5,"pos":458}}},"contents":[{"Add":"OBJS += change.o"}]}}],"owner":"laumann","repo":"ani","token":"LLMI+iZhALoTDcei6H3xF5iAJNE0jhNS+aID2wXO/1Q=","login":null}

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Dependencies

Change contents